US20020183846A1 - Spinal implant - Google Patents
Spinal implant Download PDFInfo
- Publication number
- US20020183846A1 US20020183846A1 US10/140,220 US14022002A US2002183846A1 US 20020183846 A1 US20020183846 A1 US 20020183846A1 US 14022002 A US14022002 A US 14022002A US 2002183846 A1 US2002183846 A1 US 2002183846A1
- Authority
- US
- United States
- Prior art keywords
- implant
- opposing
- axis
- vertebrae
- disposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30744—End caps, e.g. for closing an endoprosthetic cavity
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/446—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
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- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8875—Screwdrivers, spanners or wrenches
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- A61F2/02—Prostheses implantable into the body
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- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
- A61F2002/30851—Multiple threadings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
- A61F2002/30868—Square, rectangular or rhomboidal threads
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0004—Rounded shapes, e.g. with rounded corners
- A61F2230/0008—Rounded shapes, e.g. with rounded corners elliptical or oval
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0017—Angular shapes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0067—Three-dimensional shapes conical
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
- A61F2250/0097—Visible markings, e.g. indicia
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00179—Ceramics or ceramic-like structures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S606/00—Surgery
- Y10S606/907—Composed of particular material or coated
Definitions
- This invention pertains to surgical procedures for stabilizing the spine. More particularly, this invention pertains to a novel implant for use in such a procedure.
- Chronic low back pain is one of the most common and perplexing problems facing the field of orthopedic surgery. In addition to patient discomfort, chronic low back pain has severe adverse societal impacts including lost income, possible chronic dependence on drugs, alcohol and public relief programs.
- intervertebral stabilization In many cases, low back pain can be avoided by preventing relative motion between spinal vertebrae (commonly referred to as intervertebral stabilization). To abate low back pain, stabilization is directed to stabilizing contiguous vertebrae in the lumbar region of the spine.
- Surgical techniques are known for use in spinal stabilization. Surgical techniques seek to rigidly join vertebrae which are separated by a degenerated disk. Ideally, the surgery effectively replaces the vertebra-disk-vertebra combination with a single rigid vertebra. Various surgical techniques have developed which attempt to approach or approximate this ideal.
- One technique known in the art is to partially remove a degenerated disk and to insert a bone graft into the void formed by the removed disk.
- Other techniques involve the use of an implant which, acting alone or in combination with bone fragments, replace the use of bone grafts.
- An example of such implant is shown in U.S. Pat. No. 4,501,269 to Bagby dated Feb. 26, 1985.
- Bagby a large, cylindrical basket is driven into a hole formed between bones which are to be joined.
- the basket is hollow and is filled with bone fragments which are produced during a boring step. Bone-to-bone fusion is achieved through and about the basket.
- the hole for the Basket is slightly smaller than the diameter of the basket. This structure results in the spreading of the opposing bone segments upon insertion of the basket. This results in taughtness, which provides initial stabilization. Eventual fusion of the opposing bone segments results from bone growth through the basket.
- an implant for insertion into a body formed between opposing vertebrae of an animal's spine.
- the implant includes a rigid body having a leading end and a trailing end spaced apart along a longitudinal axis of the body.
- the body has exposed threads which are disposed between the leading and trailing ends. The threads are selected to engage vertebra material and draw the body along the direction of the axis upon rotation of the body about the axis.
- the body defines a chamber which is exposed through the body by a plurality of radially extending openings.
- the chamber may be filled with bone fragments which can fuse with the vertebra bone material through the openings.
- a reinforcing rib is provided within the body.
- a generally oval-shaped implant which is hammered into an elongated bore between two opposing vertebrae.
- the oval-shaped implant has enhanced surface area contact between the vertebrae and provides greater integrity against rotational motion between opposing vertebrae.
- FIG. 1 is a perspective exploded of view of an implant according to a preferred embodiment of the present invention
- FIG. 2 is a side elevation view of a body portion of the implant of FIG. 1;
- FIG. 2A is a side elevation view of an alternative embodiment of a body portion of an implant according to the present invention.
- FIG. 3 is an end view taken in elevation of the trailing end of the body portion of FIG. 2 taken along line 3 - 3 of FIG. 2;
- FIG. 3A is the same view as FIG. 3 showing an alternative embodiment
- FIG. 4 is a view taken along lines 4 - 4 of FIG. 2;
- FIG. 4A is the same view as FIG. 4 showing an alternative embodiment
- FIG. 5 is a view taken along line 5 - 5 of FIG. 2;
- FIG. 6 is a view taken along lines 6 - 6 of FIG. 3;
- FIG. 7 is an enlarged view, taken in section, of the threads of the body of FIG. 2 adjacent the trailing end;
- FIG. 7A is a view, taken in section, of the threads of the body portion of FIG. 2 adjacent a leading end of the body;
- FIG. 8 is a side sectional view of a leading end cap of the implant of FIG. 1;
- FIG. 9 is an inside end elevation view of the end cap of FIG. 8 taken along line 9 - 9 of FIG. 8;
- FIG. 10 is a side sectional view of a trailing end cap of the implant of FIG. 1;
- FIG. 11 is an end elevation view of the end cap of FIG. 10 taken along line 11 - 11 of FIG. 10;
- FIG. 12 is a top plan view showing insertion of a single implant of FIG. 1 into an intervertebral space
- FIG. 12A is a view taken along lines 12 A- 12 A of FIG. 12;
- FIG. 13 is a top plan view showing an alternative embodiment of the present invention in place in a vertebra
- FIG. 13A is a view taken along lines 13 A- 13 A of FIG. 13;
- FIG. 14 is a perspective view of an alternative embodiment of the present invention showing an implant body leading end, side and top;
- FIG. 15 is a perspective view of the body of FIG. 14 showing a trailing end, side and top;
- FIG. 16 is a top plan view of the embodiment of FIGS. 14 and 15;
- FIG. 17 is a side sectional view taken along lines 17 - 17 of FIG. 16;
- FIG. 18 is a side elevation view of a trailing end cap for use with the embodiment of FIGS. 14 and 15;
- FIG. 19 is an end view taken in elevation of the end cap of FIG. 18;
- FIG. 20 is an elevation view a trailing end of the embodiment of FIGS. 14 and 15;
- FIG. 21 is an elevation view of a leading end of the body of the embodiment of FIGS. 14 and 15;
- FIG. 22 is a side elevation view of the body portion of FIGS. 14 and 15;
- FIG. 23 is a top plan view of an assembled implant including body portion and end cap shown in place in a vertebra body;
- FIG. 24 is an anterior elevation view showing a bore drilling sequence prior to insertion of the implant as shown in FIG. 23;
- FIG. 25 is a view taken along lines 25 - 25 of FIG. 23;
- FIG. 26 is a cross-sectional view taken along a longitudinal axis of an alternative embodiment of the present invention.
- FIG. 27 is a cross-sectional axial view of the embodiment of FIG. 26;
- FIG. 28 is a cross-sectional longitudinal view of an additional alternative embodiment of the present invention.
- FIG. 29 is a cross-sectional axial view of the embodiment of FIG. 28.
- FIG. 1 is an exploded perspective view of an implant according to a preferred embodiment of the present invention.
- the implant is shown generally at 10 .
- FIG. 12 shows the implant 10 inserted within a bore 102 formed in a human vertebra body 100 .
- the implant 10 (as well as alternative embodiments of the invention) will be described for use in a human spine. Further, dimensions, when given, will be preferred dimensions for use in a specific spinal location of a particular class of humans—notably, the L-5 vertebra of a typical adult male. It will be appreciated that the present invention is intended for use in a wide variety of vertebra sizes and a wide variety of animal species.
- the dimensions of the implant 10 (as well as the dimensions of the alternative embodiments) will vary necessarily with the size of the vertebra in which the implant 10 is to be used. However, making variations to the dimensions and sizes in order to accommodate differing sizes of vertebrae will be well within the skill of the art.
- FIGS. 1 - 12 a first preferred embodiment of the present invention will now be described. Identical elements are numbered identically throughout.
- the implant 10 includes a body 12 (shown separately in FIGS. 2 , 3 - 6 ) having a leading end 14 and a trailing end 16 which are spaced apart along a longitudinal axis X-X of the body 12 .
- the implant also includes a leading end cap 18 and a trailing end cap 20 (shown separately in FIGS. 8 - 9 and FIGS. 10 - 11 , respectively).
- Body 12 is integrally constructed from a rigid, biocompatible material. While any rigid, biocompatible material (such as a ceramic) could be used, body 12 is preferably formed from titanium and/or its alloys. Titanium and/or its alloys is preferred since it is noncorrosive and fatigue resistant. Also, titanium is widely used in prosthetic devices and the material has a proven record of satisfactory performance.
- the body 12 includes a hollow cylindrical shell 22 of predetermined diameter D 1 (see FIG. 3).
- D 1 is selected to be about 0.5 inches.
- the shell 22 surrounds and defines an interior chamber 24 .
- Chamber 24 has a diameter D 3 of preferably about 0.384 inches.
- Threads 26 and 28 are formed on the exterior surface of shell 22 spirally wound around shell 22 and integral therewith. While double threading is shown, single threading or multiple threading in excess of double threading could be applied. Threads 26 , 28 are disposed and selected for the threads 26 , 28 to engage the bone material of opposing vertebrae and draw the body 12 in the direction of axis X-X upon rotation of the body 12 about axis X-X.
- body 12 is self-tapping.
- the threading 26 , 28 (see FIG. 2) adjacent leading end 14 is tapered as shown by angle A 1 (which is preferably about 15°, see FIG. 2).
- angle A 1 which is preferably about 15°, see FIG. 2.
- the threads 26 , 28 present flat, annular surfaces 30 which are in alignment and parallel to shell 22 .
- the thread profile presents a generally bullet-shaped profile which is cylindrical along the majority of the body 12 and tapers inwardly toward axis X-X at the leading end 14 .
- the tapered portion of body 12 preferably has a length L 1 of about 0.198 inches.
- the overall length of body 12 , L 2 is preferably about 0.740 inches. (See FIG. 2).
- the threads 26 , 28 experience a change in profile from the leading end 14 to the trailing end 16 .
- the threads are sharp, as shown in FIG. 7A.
- the threads 26 , 28 assume a profile which is generally rectangular as shown in FIG. 7.
- the sharp portions of threads 26 , 28 are numbered 26 a , 28 a in the drawings.
- the changing thread profiles are selected to assist in advancing the implant 10 into an intervertebral space and to a hold the implant 10 securely in place when fully advanced.
- the sharp portion of threads 26 , 28 (thread portions 26 a , 28 a shown in FIG. 7A) cut bone better and assist in advancing the implant 10 .
- the generally rectangular thread profile (FIG. 7) has greater cross-sectional area and better opposes bone surfaces to hold the implant 10 in place.
- FIGS. 7 and 7A Preferred dimensions of the threading 26 , 28 are shown in FIGS. 7 and 7A with a pitch, P, (distance between opposing threads) equaling about 0.10 inch for both the rectangular and sharp threading of FIGS. 7 and 7A.
- the bevel B1, of the sharp threading (FIG. 7A) is preferably about 57°.
- the bevel, B 2 , of the rectangular thread portion (FIG. 7) is preferably about 5°.
- the height, H, of the rectangular thread is about 0.10 inches. This, together with the diameter D 1 (see FIG. 3) of the shell 22 results in overall diameter of the body 12 being about 0.6 inches.
- the body 12 has a plurality of holes 32 formed radially through the shell 22 and threads 26 , 28 .
- the holes 32 provide communication between interior chamber 24 and an exterior of the body 12 .
- each of the holes 32 is preferably about 0.125 inches in diameter. Shown best in FIG. 4, each of the holes 32 includes a countersunk portion 34 at the radially outer surface of threads 26 , 28 . Preferably, the countersunk portion 34 has a diameter of about 0.155 inches.
- the countersunk portion 34 creates cutting a beveled edge 33 on the rectangular threads 26 , 28 in the location of the holes 32 .
- This cutting edge 33 is best shown in FIG. 6.
- the cutting edges 33 chip away bone as the body 12 is rotated. The bone chips will migrate through the holes 32 into chamber 24 . As will be described, it is anticipated that this chipping action will enhance the bone-to-bone fusion sought with the present invention.
- the threads 26 a , 28 a are shown self-tapping in FIG. 5 to present self-tapping cutting edges 36 set at a 90° cutting angle A 3 .
- the cutting edges 36 are shown spaced apart by an angle A 4 of about 120°.
- holes 32 extend through the threads 26 and 28 .
- An alternative embodiment would have the threads 26 and 28 spaced apart a distance greater than that shown in the present drawings, with the holes 32 extending through the shell 22 and not passing through threads 26 and 28 .
- Such a design presents enhanced structural integrity since the more massive threads 26 and 28 are not being broken.
- such an alternative design forgoes the anticipated benefits which may be attributed to the chipping action of the cutting edges 33 of the threads adjacent holes 32 .
- the number of holes 32 in the body 12 as shown is twenty. This number may vary. The number is selected to be as many and as large as possible (to enhance bone fusion), while not compromising the strength of the body 12 .
- the body 12 extends from a leading end 14 to a trailing end 16 .
- Leading end 14 has a circular axial opening 40 formed therethrough in communication with chamber 24 .
- annular groove 42 Disposed inwardly from leading end 14 is an annular groove 42 (see FIG. 6) provided to facilitate attachment of leading end cap 18 as will be described.
- Trailing end 16 has an inwardly projecting flange 44 .
- opposing surfaces of flange 44 define a centrally located hexagon-shaped axial opening 46 .
- the leading end cap 18 includes a cylindrical hub portion 50 and an annular flange 52 extending from hub portion 50 . Also extending from hub portion 50 on the side opposite flange 52 is a tapered cap portion 54 which extends from a large diameter 55 and tapers inwardly to a smaller diameter terminal end 56 .
- An angle of taper A 5 (FIG. 8) is preferably about 15° to correspond with the angle of taper A 1 (FIG. 2) of body 12 .
- the large diameter 55 is preferably selected to equal the diameter of body 12 at leading end 14 .
- Flange 52 is selected to be snap received into annular groove 42 . So received, cap 18 is permanently attached to the leading end 14 covering axial opening 40 .
- Trailing end cover 20 (FIGS. 10 and 11) includes an arcuate cap 58 sized to cover end 16 with a flat surface portion 59 of cap 20 abutting trailing end 16 .
- Six flexible retaining clips 60 are provided centrally extending from surface 59 . Clips 60 are sized to be snap received within hexagon-shaped opening 46 . Accordingly, the cooperation of surface 59 and the barbed portion 61 of clips 60 capture flange 44 to thereby hold trailing end cap 20 securely against trailing end 16 .
- each of caps 18 and 20 are preferably formed from high-density polyethylene.
- a surgeon forms a bore 102 through the intervertebral space in a disk 114 separating two opposing vertebral bodies 100 and 100 a .
- the bore 102 is sized to be as large as possible to remove disk material 114 and to at least partially cut into opposing surfaces of the bone of vertebra bodies 100 , 100 a . It will be appreciated that it is well within the skill of the art to form bores such as bore 102 .
- FIGS. 12 and 12A show a bore 102 formed through a posterior approach through a spine.
- a surgeon approaches the vertebra through the back of the patient.
- the axis of the bore 102 is formed an angle with the anterior-posterior axis, A-P, of the vertebra body 100 , 100 a .
- the angle A 6 between the A-P axis and the bore axis is about 10°.
- the bore diameter will be smaller than the diameter, D 1 , of body shell 22 . Specifically, it is anticipated that a bore diameter of about 3 millimeters less than diameter D 1 will be preferred.
- the body 12 spreads apart opposing vertebrae upon insertion. By virtue of the spreading effect, the disk annulus becomes taught, thereby providing for the initial stabilization between the opposing vertebrae. (Those skilled in the art will recognize the annulus as being the fibrous outer circumferential portion of the disk).
- the implant is shown spreading apart the vertebrae and stretching the annulus. Eventual fusion of the opposing vertebrae results from bone growth through body 12 , as will be described.
- the implant 10 is partially assembled with leading end cap 18 snapped onto leading end 14 . With trailing end cap 20 removed, the implant 10 is partially placed within bore 102 with the tapered leading end 14 received within bore 102 .
- An advancing tool (the tip of which is shown in FIG. 1) is provided having a hexagon-shaped tip 200 complementarily sized to be received within opening 46 . The tip 200 is inserted by the surgeon into opening 46 . The surgeon then turns the tool and, hence, the body 12 , in a clockwise direction (from the perspective of the surgeon). The turning action of the body 12 causes the sharp threads 26 a , 28 a (FIG.
- axial opening 46 exposes chamber 24 to the surgeon once the tool tip 200 is removed.
- a surgeon can impact a graft medium 202 (preferably bone chips) into chamber 24 (see FIG. 12A). Any impacted bone chips will supplement bone chips that may migrate through holes 32 as a result of the cutting action of cutting edges 33 against the vertebra bone surfaces.
- FIGS. 12 and 12A show such a fully assembled and inserted implant 10 .
- the surgeon can then close the patient through any suitable technique.
- the bone graft 202 within chamber 24 and openings 32 fuses together with the bone of the opposing vertebrae 100 , 100 a to thereby join the vertebrae 100 , 100 a together.
- end caps 18 , 20 are preferably formed from high density polyethylene. Such material is nonabrasive and inert, and has a slippery touch. This latter feature is particularly valuable for trailing end cap 20 , which may oppose the epidural tissue. To avoid damage or irritation of the dura, the slippery, inert, nonabrasive polyurethane trailing end cap 20 is provided. Trailing end cap 20 is intended to cover axial opening 46 and retain the bone chips within chamber 24 while providing a nonabrasive and nonirritating surface opposing the epidura. Also, like leading end cap 18 , trailing end cap 20 prevents disk material from entering chamber 24 .
- the end caps 18 , 20 formed of polyethylene which is radiolucent. Radiolucent material permits X-rays to pass. Accordingly, with radiolucent end caps 18 , 20 , an attending physician can study the growth of bone within chamber 24 without the need for exploratory surgery.
- radiolucent end cap 18 , 20 While desirable in a preferred embodiment, are not necessary to the practice of the full scope of the present invention.
- the leading end 14 could taper completely as an integral portion of the solid body 12 as shown in FIG. 2A.
- the body 12 ′ assumes a more complete hollow bullet-shaped profile where the leading edge 14 ′ includes a sharp point 15 ′ to better assist the insertion and advancement of the body 12 ′ into the intervertebral space.
- FIGS. 12 and 12A the implant 10 is shown installed on the left side (from the patient's perspective) of the anterior-posterior axis, A-P.
- A-P anterior-posterior axis
- two prostheses 10 will be used, with a second implant disposed on the right side of the anterior-posterior axis, A-P, and installed in a manner identical to that of implant 10 on the left side.
- the right side implant is not shown installed. When installed, such prostheses would be positioned with the right and left prostheses being symmetrically disposed about axis A-P.
- FIGS. 3A and 4A show an alternative.
- the implant 10 ′′′ of the embodiment of FIGS. 3A and 4A is identical to that discussed above except as to the placement of holes 32 ′′′.
- FIGS. 3A and 4A are the same view of implant 10 ′′′ as FIGS. 3 and 4 are of implant 10 . Since the elements of the implant 10 ′′′ shown in FIGS. 3A and 4A are the same (except as will be described) as those shown in FIGS. 3 and 4, all similar elements are numbered identically except for the addition of the triple prime (′′′).
- implant 10 ′′′ does not have holes 32 ′′′ circumferentially spaced about body 12 ′′′. Instead, as best shown in FIG. 4A, holes 32 ′′′ are placed on diametrically opposed sides of body 12 ′′′.
- indicia markings 15 ′′′ are placed on flange 44 ′′′.
- the markings 15 ′′′ are aligned with the axis of holes 32 ′′′.
- the surgeon turns body 12 ′′′ into position until markings 15 ′′′ are aligned pointing to bodies 100 , 100 a . So positioned, the surgeon knows the holes 32 ′′′ are opposing bone and not disc material.
- FIGS. 13 and 13A show an alternative embodiment of the invention for use in an anterior approach where a bore 102 ′ is formed from the front of the spine and axially aligned with the anterior-posterior axis, A-P. Since the bore 102 ′ is formed from an anterior approach, the size restrictions of a posteriorly formed bore (namely, locations of nerves and blood vessels) are largely avoided. As a result, a large diameter bore 102 ′ can be formed.
- FIGS. 12A and 13A show the relative increase of bore diameter. This increase results in an enhanced surface area of exposed vertebra bone and an increased amount of graft material in an implant.
- the implant 10 ′′ shown in FIGS. 13 and 13A may be identical in proportional dimensions to that of implant 10 , only enlarged to be received within the larger bore 102 ′.
- the implant 10 ′′ shown in FIGS. 13 and 13A differs from that shown in FIGS. 12 and 12A. Namely, the implant 10 ′′ shown in FIGS. 13 and 13A does not include a tapered leading end. Instead, the entire implant body 12 ′′ is cylindrical-shaped to illustrate that, while a tapered leading end is preferred, it is not necessary to practice the teachings of the present invention.
- FIGS. 15 - 25 illustrate yet a further embodiment of an implant for use in spinal stabilization.
- the implant 120 shown assembled in FIGS. 23 and 25
- the implant 120 includes a body portion 122 (shown in perspective in FIGS. 14 and 15) which is generally oval-shaped in cross section and formed from rigid, biocompatible material (preferably titanium).
- the body 122 includes generally flat side walls 124 , 126 joined by upper and lower semi-cylindrical arcuate ribs 128 .
- Arcuate ribs 128 are spaced apart to define a plurality of upper and lower semicircular arcuate openings 130 which provide communication between a hollow interior 132 of body 122 and an exterior.
- the ribs 128 define upper and lower walls of the implant 120 with the walls having openings 130 therethrough.
- Body 122 extends from a leading or anterior end 133 , and a trailing or posterior end 134 .
- Anterior end 133 has a centrally positioned cover plate 136 which partially covers end 132 but leaves upper and lower semi-circular axial openings 138 exposing interior 132 through end 133 .
- body 122 is tapered at the leading end 133 , with the side walls 124 , 126 tapering inwardly at an angle A 7 of preferably 10° each.
- the upper and lower planar of the ribs 128 are tapered inwardly as best shown in FIG. 22 at a preferred taper angles, A 8 , of about 3°.
- the edges defined by the juncture of walls 124 , 126 , ribs 128 and end 133 are rounded to facilitate insertion of implant 120 as will be described.
- the posterior end 134 (shown in FIG. 14) has an axial opening 142 which communicates with the body interior 132 .
- a pair of opposing retaining ribs 146 are shown partially extending from the side walls 124 , 126 into opening 142 .
- a posterior end cap 147 is provided with an arcuate, smooth cap 149 sized to cover end 134 and opening 142 .
- End cap 147 has retaining clips 148 selected to snap behind ribs 146 to thereby attach cap 147 against end 144 .
- Implant 120 is intended for use in a posterior approach with two prostheses 120 being inserted on opposite sides of the anterior-posterior axis of a vertebra. For ease of illustration, only one prosthetic device is shown inserted in FIGS. 23 - 25 .
- FIG. 24 shows a method for drilling the bore 154 to receive the oval-shaped implant 120 .
- three circular bores 150 , 151 , 152 are drilled in vertical alignment in opposing vertebra bodies 100 ′, 100 a ′ and separating disk 114 ′.
- the three bores 150 , 151 , 152 cooperate to form a generally oval-shaped bore 154 .
- Bore 154 is sized to be slightly smaller than the dimensions of body 122 .
- the surgeon inserts the tapered leading end 133 into bore 154 .
- the surgeon impacts on the uncapped posterior end 134 to drive the implant 120 into the bore 154 as shown in FIGS. 23 and 25.
- the tapers A 7 and A 8 (FIGS. 16 and 22) and the rounded corners on leading end 133 assist in the insertion.
- the surgeon fills the chamber 132 with graft medium 155 (again, preferably bone chips), the surgeon then installs the polyethylene posterior cap 147 to cover posterior end 134 and provide a non-abrasive surface opposing the epidura.
- graft medium 155 preferably bone chips
- the implant 120 of FIGS. 14 - 25 greatly enhances the depth of insertion into opposing vertebrae 100 ′, 100 a ′ through a posterior approach.
- an oval bore 154 can be formed having a height, H 2 (see FIG. 24) equal to about three times the diameter of bores 102 described in previous embodiments.
- H 2 see FIG. 24
- This added depth directly into the bone material of the vertebra body 100 ′, 100 a ′ increases the surface area available for grafting to thereby enhance the probability of a successful graft.
- the increased depth into each of the vertebra bodies provides increased surface to prevent relative rotation of the opposing vertebrae 100 ′, 100 a ′ about the axis of the spine.
- the side walls 124 , 126 of the implant do not have openings and, therefore prevent disk material from penetrating into the chamber and thereby interfering with the bone fusion.
- the implant 120 is sized for the upper and lower openings 133 to be located completely above and below, respectively, the disk layer 114 ′.
- plate 136 on end 133 is sized to be about the thickness of layer 114 ′ (or slightly greater) to prevent disk material from entering the interior 132 of implant 120 .
- Openings 138 are positioned to oppose only bone of vertebra 100 ′, 100 a′.
- FIGS. 26 - 29 show additional alternative embodiments of the present invention.
- FIG. 26 shows an implant body 312 extending from a leading end 314 to a trailing end 316 .
- the leading end 314 has an axial opening 340 formed therethrough in communication with a body chamber 324 .
- the trailing end 316 has an opening 344 in communication with chamber 324 .
- a plurality of threads 326 surround the body 312 . Further, a plurality of holes 332 are formed through the body.
- the holes 332 do not extend radially from the longitudinal axis X′-X′ of the body 312 . Instead, the holes 332 have their axes Y′-Y′ disposed radially offset from the longitudinal axis X′-X′.
- an enhanced cutting edge 333 is formed which opposes bone as the body 312 is threaded between the opposing vertebrae. The cutting edge 333 chips away at the bond forcing bone chips to fall through the holes 332 into the chamber 324 .
- a central rib 325 is provided within chamber 324 . Rib 325 adds structural integrity to the body 312 . Also, as shown best in FIG. 27, a noncircular opening 327 (in the preferred embodiment of FIG. 27, a triangular-shaped opening 327 ) is provided. Opening 327 may receive the tip of a turning tool (not shown but similar to tool 200 in FIG. 1) which may be inserted within opening 327 to turn the body 312 as it is being threaded between opposing vertebrae. In FIGS. 28 and 29, a body 412 is provide with threads 426 . The embodiment of FIGS. 28 and 29 surrounds central chamber 424 . A rib 425 is provided within chamber 442 .
- Rib 425 is provided with an oval opening 427 which may receive an oval tool tip (not shown but serving the function of tool tip 200 of FIG. 1).
- the use of an oval opening 427 in FIG. 29 or a triangular opening 327 in FIG. 27 provides assistance to a surgeon indicating directional alignment of the body 412 with a patient's vertebrae.
- holes 432 and 532 are shown in FIGS. 28 and 29. Specifically, holes 532 are provided on diametrically opposite sides of implant body 412 and are axially aligned with the longitudinal dimension X′′-X′′ of oval opening 427 . The axes between opposing holes 532 defines an axial line Y′′-Y′′ which separates the body into a right and left half (when viewed in FIG. 29). On opposite sides of the line Y′′-Y′′, holes 432 are provided which are smaller in diameter than holes 532 . Similar to holes 332 in FIG. 27, holes 432 are provided with their axes offset from the central axes X′′-X′′ of FIG. 29 in order to define cutting edges 433 at the intersection between the holes 432 and the threads 426 .
- the enlarged holes 532 are provided to align with the opposing vertebrae such that the holes 532 oppose the vertebrae after full insertion of the body 412 .
- Accurate alignment is provided by the surgeon aligning the longitudinal dimension of oval 427 (by operation of an insertion tool not shown) to be in alignment with the vertebrae. When so aligned, the largest holes 532 oppose the vertebrae bone to insure least resistance to bone growth through the body 412 .
- the surgeon will provide a bone slurry filling the implant and the holes 432 , 532 and surrounding the body 412 . Further, upon implanting the body 412 , the bone from the vertebrae is chipped by cutting edges 433 into holes 432 . As a result, a solid bone mass is provided through the holes 432 into chamber 442 and surrounding and penetrating the implant body 412 .
Abstract
Description
- The present application is a divisional application of Ser. No. 07/702,351 which is a continuation-in-part of U.S. Ser. No. 07/405,564 which is a continuation-in-part application claiming priority to commonly assigned U.S. patent application Ser. No. 07/376,657, filed Jul. 6, 1989, entitled “Spinal Prosthesis” and naming the same inventors as the present invention.
- 1. Field of the Invention
- This invention pertains to surgical procedures for stabilizing the spine. More particularly, this invention pertains to a novel implant for use in such a procedure.
- 2. Description of the Prior Art
- Chronic low back pain is one of the most common and perplexing problems facing the field of orthopedic surgery. In addition to patient discomfort, chronic low back pain has severe adverse societal impacts including lost income, possible chronic dependence on drugs, alcohol and public relief programs.
- In many cases, low back pain can be avoided by preventing relative motion between spinal vertebrae (commonly referred to as intervertebral stabilization). To abate low back pain, stabilization is directed to stabilizing contiguous vertebrae in the lumbar region of the spine.
- Surgical techniques are known for use in spinal stabilization. Surgical techniques seek to rigidly join vertebrae which are separated by a degenerated disk. Ideally, the surgery effectively replaces the vertebra-disk-vertebra combination with a single rigid vertebra. Various surgical techniques have developed which attempt to approach or approximate this ideal.
- One technique known in the art is to partially remove a degenerated disk and to insert a bone graft into the void formed by the removed disk. Other techniques involve the use of an implant which, acting alone or in combination with bone fragments, replace the use of bone grafts. An example of such implant is shown in U.S. Pat. No. 4,501,269 to Bagby dated Feb. 26, 1985. In Bagby, a large, cylindrical basket is driven into a hole formed between bones which are to be joined. The basket is hollow and is filled with bone fragments which are produced during a boring step. Bone-to-bone fusion is achieved through and about the basket. In Bagby, the hole for the Basket is slightly smaller than the diameter of the basket. This structure results in the spreading of the opposing bone segments upon insertion of the basket. This results in taughtness, which provides initial stabilization. Eventual fusion of the opposing bone segments results from bone growth through the basket.
- Prostheses such as that shown in U.S. Pat. No. 4,501,269 are promising. However, improved implant design is necessary to enhance patient safety and the probability of a satisfactory recovery.
- According to a preferred embodiment of the present invention, an implant is disclosed for insertion into a body formed between opposing vertebrae of an animal's spine. The implant includes a rigid body having a leading end and a trailing end spaced apart along a longitudinal axis of the body. The body has exposed threads which are disposed between the leading and trailing ends. The threads are selected to engage vertebra material and draw the body along the direction of the axis upon rotation of the body about the axis. The body defines a chamber which is exposed through the body by a plurality of radially extending openings. The chamber may be filled with bone fragments which can fuse with the vertebra bone material through the openings. In one embodiment, a reinforcing rib is provided within the body.
- In an alternative embodiment of the invention disclosed herein, a generally oval-shaped implant is disclosed which is hammered into an elongated bore between two opposing vertebrae. The oval-shaped implant has enhanced surface area contact between the vertebrae and provides greater integrity against rotational motion between opposing vertebrae.
- FIG. 1 is a perspective exploded of view of an implant according to a preferred embodiment of the present invention;
- FIG. 2 is a side elevation view of a body portion of the implant of FIG. 1;
- FIG. 2A is a side elevation view of an alternative embodiment of a body portion of an implant according to the present invention;
- FIG. 3 is an end view taken in elevation of the trailing end of the body portion of FIG. 2 taken along line3-3 of FIG. 2;
- FIG. 3A is the same view as FIG. 3 showing an alternative embodiment;
- FIG. 4 is a view taken along lines4-4 of FIG. 2;
- FIG. 4A is the same view as FIG. 4 showing an alternative embodiment;
- FIG. 5 is a view taken along line5-5 of FIG. 2;
- FIG. 6 is a view taken along lines6-6 of FIG. 3;
- FIG. 7 is an enlarged view, taken in section, of the threads of the body of FIG. 2 adjacent the trailing end;
- FIG. 7A is a view, taken in section, of the threads of the body portion of FIG. 2 adjacent a leading end of the body;
- FIG. 8 is a side sectional view of a leading end cap of the implant of FIG. 1;
- FIG. 9 is an inside end elevation view of the end cap of FIG. 8 taken along line9-9 of FIG. 8;
- FIG. 10 is a side sectional view of a trailing end cap of the implant of FIG. 1;
- FIG. 11 is an end elevation view of the end cap of FIG. 10 taken along line11-11 of FIG. 10;
- FIG. 12 is a top plan view showing insertion of a single implant of FIG. 1 into an intervertebral space;
- FIG. 12A is a view taken along lines12A-12A of FIG. 12;
- FIG. 13 is a top plan view showing an alternative embodiment of the present invention in place in a vertebra;
- FIG. 13A is a view taken along
lines 13A-13A of FIG. 13; - FIG. 14 is a perspective view of an alternative embodiment of the present invention showing an implant body leading end, side and top;
- FIG. 15 is a perspective view of the body of FIG. 14 showing a trailing end, side and top;
- FIG. 16 is a top plan view of the embodiment of FIGS. 14 and 15;
- FIG. 17 is a side sectional view taken along lines17-17 of FIG. 16;
- FIG. 18 is a side elevation view of a trailing end cap for use with the embodiment of FIGS. 14 and 15;
- FIG. 19 is an end view taken in elevation of the end cap of FIG. 18;
- FIG. 20 is an elevation view a trailing end of the embodiment of FIGS. 14 and 15;
- FIG. 21 is an elevation view of a leading end of the body of the embodiment of FIGS. 14 and 15;
- FIG. 22 is a side elevation view of the body portion of FIGS. 14 and 15;
- FIG. 23 is a top plan view of an assembled implant including body portion and end cap shown in place in a vertebra body;
- FIG. 24 is an anterior elevation view showing a bore drilling sequence prior to insertion of the implant as shown in FIG. 23;
- FIG. 25 is a view taken along lines25-25 of FIG. 23;
- FIG. 26 is a cross-sectional view taken along a longitudinal axis of an alternative embodiment of the present invention;
- FIG. 27 is a cross-sectional axial view of the embodiment of FIG. 26;
- FIG. 28 is a cross-sectional longitudinal view of an additional alternative embodiment of the present invention; and
- FIG. 29 is a cross-sectional axial view of the embodiment of FIG. 28.
- A. General.
- Reference is now directed to FIGS. 1 and 12. FIG. 1 is an exploded perspective view of an implant according to a preferred embodiment of the present invention. The implant is shown generally at10. FIG. 12 shows the
implant 10 inserted within abore 102 formed in ahuman vertebra body 100. - For ease of description, the implant10 (as well as alternative embodiments of the invention) will be described for use in a human spine. Further, dimensions, when given, will be preferred dimensions for use in a specific spinal location of a particular class of humans—notably, the L-5 vertebra of a typical adult male. It will be appreciated that the present invention is intended for use in a wide variety of vertebra sizes and a wide variety of animal species. The dimensions of the implant 10 (as well as the dimensions of the alternative embodiments) will vary necessarily with the size of the vertebra in which the
implant 10 is to be used. However, making variations to the dimensions and sizes in order to accommodate differing sizes of vertebrae will be well within the skill of the art. - B. First Preferred Embodiment.
- With reference now directed to FIGS.1-12, a first preferred embodiment of the present invention will now be described. Identical elements are numbered identically throughout.
- The
implant 10 includes a body 12 (shown separately in FIGS. 2, 3-6) having a leadingend 14 and a trailingend 16 which are spaced apart along a longitudinal axis X-X of thebody 12. The implant also includes aleading end cap 18 and a trailing end cap 20 (shown separately in FIGS. 8-9 and FIGS. 10-11, respectively). -
Body 12 is integrally constructed from a rigid, biocompatible material. While any rigid, biocompatible material (such as a ceramic) could be used,body 12 is preferably formed from titanium and/or its alloys. Titanium and/or its alloys is preferred since it is noncorrosive and fatigue resistant. Also, titanium is widely used in prosthetic devices and the material has a proven record of satisfactory performance. - With best reference to FIGS.2-7 and 7A, the
body 12 includes a hollowcylindrical shell 22 of predetermined diameter D1 (see FIG. 3). For reasons that will be later described D1 is selected to be about 0.5 inches. - The
shell 22 surrounds and defines aninterior chamber 24.Chamber 24 has a diameter D3 of preferably about 0.384 inches. -
Threads shell 22 spirally wound aroundshell 22 and integral therewith. While double threading is shown, single threading or multiple threading in excess of double threading could be applied.Threads threads body 12 in the direction of axis X-X upon rotation of thebody 12 about axis X-X. - In a preferred embodiment,
body 12 is self-tapping. Mainly, the threading 26, 28 (see FIG. 2) adjacent leadingend 14 is tapered as shown by angle A1 (which is preferably about 15°, see FIG. 2). Away from thetapered end 14, and adjacent the trailingend 16, thethreads body 12 and tapers inwardly toward axis X-X at theleading end 14. - The tapered portion of
body 12 preferably has a length L1 of about 0.198 inches. The overall length ofbody 12, L2, is preferably about 0.740 inches. (See FIG. 2). - To assist in the self-tapping, the
threads end 14 to the trailingend 16. At the leadingend 14, the threads are sharp, as shown in FIG. 7A. When the taper portion ofbody 12 is passed, thethreads threads - The changing thread profiles are selected to assist in advancing the
implant 10 into an intervertebral space and to a hold theimplant 10 securely in place when fully advanced. The sharp portion ofthreads 26, 28 (thread portions implant 10. The generally rectangular thread profile (FIG. 7) has greater cross-sectional area and better opposes bone surfaces to hold theimplant 10 in place. - Preferred dimensions of the threading26, 28 are shown in FIGS. 7 and 7A with a pitch, P, (distance between opposing threads) equaling about 0.10 inch for both the rectangular and sharp threading of FIGS. 7 and 7A. The bevel B1, of the sharp threading (FIG. 7A) is preferably about 57°. The bevel, B2, of the rectangular thread portion (FIG. 7) is preferably about 5°. The height, H, of the rectangular thread is about 0.10 inches. This, together with the diameter D1 (see FIG. 3) of the
shell 22 results in overall diameter of thebody 12 being about 0.6 inches. It will be appreciated that these dimensions as well as remaining dimensions given throughout this application are preferred dimensions and may be varied while retaining the structure and function of the present invention. The scope of the claims of the present invention is not intended to be limited by dimensions which are set forth only to illustrate a preferred embodiment. - The
body 12 has a plurality ofholes 32 formed radially through theshell 22 andthreads holes 32 provide communication betweeninterior chamber 24 and an exterior of thebody 12. - The
holes 32 are identical and each is preferably about 0.125 inches in diameter. Shown best in FIG. 4, each of theholes 32 includes a countersunkportion 34 at the radially outer surface ofthreads portion 34 has a diameter of about 0.155 inches. - The countersunk
portion 34 creates cutting abeveled edge 33 on therectangular threads holes 32. Thiscutting edge 33 is best shown in FIG. 6. The cutting edges 33 chip away bone as thebody 12 is rotated. The bone chips will migrate through theholes 32 intochamber 24. As will be described, it is anticipated that this chipping action will enhance the bone-to-bone fusion sought with the present invention. - In the region of the self-tapping
sharp threads threads cutting edges 36 set at a 90° cutting angle A3. The cutting edges 36 are shown spaced apart by an angle A4 of about 120°. - In the preferred embodiment as shown, holes32 extend through the
threads threads holes 32 extending through theshell 22 and not passing throughthreads massive threads adjacent holes 32. - The number of
holes 32 in thebody 12 as shown is twenty. This number may vary. The number is selected to be as many and as large as possible (to enhance bone fusion), while not compromising the strength of thebody 12. - As previously indicated, the
body 12 extends from a leadingend 14 to a trailingend 16. Leadingend 14 has a circularaxial opening 40 formed therethrough in communication withchamber 24. Disposed inwardly from leadingend 14 is an annular groove 42 (see FIG. 6) provided to facilitate attachment of leadingend cap 18 as will be described. - Trailing
end 16 has an inwardly projectingflange 44. opposing surfaces offlange 44 define a centrally located hexagon-shapedaxial opening 46. - When the
implant 10 is in place in an intervertebral space, circularaxial opening 40 and hexagonaxial opening 46 are covered bycaps leading end cap 18 includes acylindrical hub portion 50 and anannular flange 52 extending fromhub portion 50. Also extending fromhub portion 50 on the side oppositeflange 52 is a taperedcap portion 54 which extends from alarge diameter 55 and tapers inwardly to a smaller diameterterminal end 56. An angle of taper A5 (FIG. 8) is preferably about 15° to correspond with the angle of taper A1 (FIG. 2) ofbody 12. Thelarge diameter 55 is preferably selected to equal the diameter ofbody 12 at leadingend 14.Flange 52 is selected to be snap received intoannular groove 42. So received,cap 18 is permanently attached to theleading end 14 coveringaxial opening 40. - Trailing end cover20 (FIGS. 10 and 11) includes an
arcuate cap 58 sized to coverend 16 with aflat surface portion 59 ofcap 20abutting trailing end 16. Six flexible retaining clips 60 are provided centrally extending fromsurface 59.Clips 60 are sized to be snap received within hexagon-shapedopening 46. Accordingly, the cooperation ofsurface 59 and thebarbed portion 61 ofclips 60capture flange 44 to thereby hold trailingend cap 20 securely against trailingend 16. For reasons that will be described, each ofcaps - C. Method of Use.
- Referring to FIGS. 12 and 12A, the method of use of the
implant 10 will now be described. In use of theimplant 10, a surgeon forms abore 102 through the intervertebral space in adisk 114 separating two opposingvertebral bodies bore 102 is sized to be as large as possible to removedisk material 114 and to at least partially cut into opposing surfaces of the bone ofvertebra bodies bore 102. - FIGS. 12 and 12A show a
bore 102 formed through a posterior approach through a spine. In a posterior approach, a surgeon approaches the vertebra through the back of the patient. Preferably, the axis of thebore 102 is formed an angle with the anterior-posterior axis, A-P, of thevertebra body - It is recognized that there are limits on the maximum size of a
bore 102 that can directly drilled in a vertebra body via a posterior approach. Limitations on the diameter of thebore 102 include location of important nerves and blood vessels which can be damaged by excessively large bore drilling operations. The maximum size bore that can be cut will depend on the particular location of the spine, the species of the animal, age and sex. A common safe maximum for an adult male spine in the L-5 area would be a bore diameter of about 0.5 inches. - For reasons that will be described, it is preferred that the bore diameter will be smaller than the diameter, D1, of
body shell 22. Specifically, it is anticipated that a bore diameter of about 3 millimeters less than diameter D1 will be preferred. With such structure, thebody 12 spreads apart opposing vertebrae upon insertion. By virtue of the spreading effect, the disk annulus becomes taught, thereby providing for the initial stabilization between the opposing vertebrae. (Those skilled in the art will recognize the annulus as being the fibrous outer circumferential portion of the disk). In the drawings, the implant is shown spreading apart the vertebrae and stretching the annulus. Eventual fusion of the opposing vertebrae results from bone growth throughbody 12, as will be described. - The
implant 10 is partially assembled withleading end cap 18 snapped onto leadingend 14. With trailingend cap 20 removed, theimplant 10 is partially placed withinbore 102 with the tapered leadingend 14 received withinbore 102. An advancing tool (the tip of which is shown in FIG. 1) is provided having a hexagon-shapedtip 200 complementarily sized to be received withinopening 46. Thetip 200 is inserted by the surgeon intoopening 46. The surgeon then turns the tool and, hence, thebody 12, in a clockwise direction (from the perspective of the surgeon). The turning action of thebody 12 causes thesharp threads vertebrae bodies body 12 intobore 102 to the fully inserted position shown in FIG. 12. Therectangular threads 26, 28 (FIG. 7) retain thebody 12 in the desired axial position relative to bore 102. Leadingend cap 18 coveringaxial opening 40 prevents disk material from migrating throughaxial opening 40 intochamber 24 during insertion ofimplant 10 as well as during the patient's recovery phase. - With the
implant body 12 fully inserted as shown in FIG. 12, the trailingend cap 18 has not yet been installed. Accordingly,axial opening 46 exposeschamber 24 to the surgeon once thetool tip 200 is removed. With opening 46 still exposingchamber 24, a surgeon can impact a graft medium 202 (preferably bone chips) into chamber 24 (see FIG. 12A). Any impacted bone chips will supplement bone chips that may migrate throughholes 32 as a result of the cutting action of cuttingedges 33 against the vertebra bone surfaces. - With the graft medium fully applied to
chamber 24, the surgeon snapscap 20 intohole 46 to cover the trailingend 16. FIGS. 12 and 12A show such a fully assembled and insertedimplant 10. The surgeon can then close the patient through any suitable technique. With the completedimplant 10 installed in the manner indicated, thebone graft 202 withinchamber 24 andopenings 32 fuses together with the bone of the opposingvertebrae vertebrae - As previously indicated, end caps18, 20 are preferably formed from high density polyethylene. Such material is nonabrasive and inert, and has a slippery touch. This latter feature is particularly valuable for trailing
end cap 20, which may oppose the epidural tissue. To avoid damage or irritation of the dura, the slippery, inert, nonabrasive polyurethane trailingend cap 20 is provided. Trailingend cap 20 is intended to coveraxial opening 46 and retain the bone chips withinchamber 24 while providing a nonabrasive and nonirritating surface opposing the epidura. Also, like leadingend cap 18, trailingend cap 20 prevents disk material from enteringchamber 24. - In a preferred embodiment, the end caps18, 20 formed of polyethylene which is radiolucent. Radiolucent material permits X-rays to pass. Accordingly, with
radiolucent end caps chamber 24 without the need for exploratory surgery. - It will be appreciated that
radiolucent end cap end 14 could taper completely as an integral portion of thesolid body 12 as shown in FIG. 2A. In such an embodiment, thebody 12′ assumes a more complete hollow bullet-shaped profile where the leadingedge 14′ includes a sharp point 15′ to better assist the insertion and advancement of thebody 12′ into the intervertebral space. - In FIGS. 12 and 12A, the
implant 10 is shown installed on the left side (from the patient's perspective) of the anterior-posterior axis, A-P. For a posterior approach as shown in FIG. 12, it is anticipated that twoprostheses 10 will be used, with a second implant disposed on the right side of the anterior-posterior axis, A-P, and installed in a manner identical to that ofimplant 10 on the left side. However, for ease of illustration, the right side implant is not shown installed. When installed, such prostheses would be positioned with the right and left prostheses being symmetrically disposed about axis A-P. - D. Alternative Design
- FIGS. 3A and 4A show an alternative. The
implant 10′″ of the embodiment of FIGS. 3A and 4A is identical to that discussed above except as to the placement ofholes 32′″. For ease of understanding the comparison betweenimplant 10′″ andimplant 10, the reader will note that FIGS. 3A and 4A are the same view ofimplant 10′″ as FIGS. 3 and 4 are ofimplant 10. Since the elements of theimplant 10′″ shown in FIGS. 3A and 4A are the same (except as will be described) as those shown in FIGS. 3 and 4, all similar elements are numbered identically except for the addition of the triple prime (′″). - Unlike
implant 10,implant 10′″ does not haveholes 32′″ circumferentially spaced aboutbody 12′″. Instead, as best shown in FIG. 4A, holes 32′″ are placed on diametrically opposed sides ofbody 12′″. - Upon insertion of the
implant 10′″, the surgeon positions theimplant 10′″ withholes 32′″ opposing the bone material of thevertebra bodies disc material 114 may enter intochamber 24′″. This prevents possible interference of disc material with the bone fusion process. - To assist a surgeon, indicia markings15′″ are placed on
flange 44′″. The markings 15′″ are aligned with the axis ofholes 32′″. The surgeon turnsbody 12′″ into position until markings 15′″ are aligned pointing tobodies holes 32′″ are opposing bone and not disc material. - E. Alternative Method and Apparatus for Anterior Approach.
- The foregoing description and illustration describe the insertion of an
implant 10 through a posterior approach. FIGS. 13 and 13A show an alternative embodiment of the invention for use in an anterior approach where abore 102′ is formed from the front of the spine and axially aligned with the anterior-posterior axis, A-P. Since thebore 102′ is formed from an anterior approach, the size restrictions of a posteriorly formed bore (namely, locations of nerves and blood vessels) are largely avoided. As a result, a large diameter bore 102′ can be formed. A comparison of FIGS. 12A and 13A show the relative increase of bore diameter. This increase results in an enhanced surface area of exposed vertebra bone and an increased amount of graft material in an implant. - The
implant 10″ shown in FIGS. 13 and 13A may be identical in proportional dimensions to that ofimplant 10, only enlarged to be received within thelarger bore 102′. However, theimplant 10″ shown in FIGS. 13 and 13A differs from that shown in FIGS. 12 and 12A. Namely, theimplant 10″ shown in FIGS. 13 and 13A does not include a tapered leading end. Instead, theentire implant body 12″ is cylindrical-shaped to illustrate that, while a tapered leading end is preferred, it is not necessary to practice the teachings of the present invention. - F. Further Alternative Embodiments.
- FIGS.15-25 illustrate yet a further embodiment of an implant for use in spinal stabilization. As shown in those figures, the implant 120 (shown assembled in FIGS. 23 and 25) includes a body portion 122 (shown in perspective in FIGS. 14 and 15) which is generally oval-shaped in cross section and formed from rigid, biocompatible material (preferably titanium). The
body 122 includes generallyflat side walls arcuate ribs 128.Arcuate ribs 128 are spaced apart to define a plurality of upper and lower semicirculararcuate openings 130 which provide communication between ahollow interior 132 ofbody 122 and an exterior. Theribs 128 define upper and lower walls of theimplant 120 with thewalls having openings 130 therethrough. -
Body 122 extends from a leading oranterior end 133, and a trailing orposterior end 134.Anterior end 133 has a centrally positionedcover plate 136 which partially coversend 132 but leaves upper and lower semi-circularaxial openings 138 exposing interior 132 throughend 133. - Shown best in FIG. 16,
body 122 is tapered at theleading end 133, with theside walls ribs 128 are tapered inwardly as best shown in FIG. 22 at a preferred taper angles, A8, of about 3°. The edges defined by the juncture ofwalls ribs 128 and end 133 are rounded to facilitate insertion ofimplant 120 as will be described. - The posterior end134 (shown in FIG. 14) has an
axial opening 142 which communicates with thebody interior 132. A pair of opposing retainingribs 146 are shown partially extending from theside walls opening 142. Aposterior end cap 147 is provided with an arcuate,smooth cap 149 sized to coverend 134 andopening 142.End cap 147 has retainingclips 148 selected to snap behindribs 146 to thereby attachcap 147 against end 144. - G. Method of Use of Alternative Embodiment.
-
Implant 120 is intended for use in a posterior approach with twoprostheses 120 being inserted on opposite sides of the anterior-posterior axis of a vertebra. For ease of illustration, only one prosthetic device is shown inserted in FIGS. 23-25. - FIG. 24 shows a method for drilling the
bore 154 to receive the oval-shapedimplant 120. As shown in FIG. 24, threecircular bores vertebra bodies 100′, 100 a′ andseparating disk 114′. The three bores 150, 151, 152 cooperate to form a generally oval-shapedbore 154. -
Bore 154 is sized to be slightly smaller than the dimensions ofbody 122. The surgeon inserts the taperedleading end 133 intobore 154. With any suitable hammering mechanism, the surgeon then impacts on the uncappedposterior end 134 to drive theimplant 120 into thebore 154 as shown in FIGS. 23 and 25. The tapers A7 and A8 (FIGS. 16 and 22) and the rounded corners on leadingend 133 assist in the insertion. - With the implant fully inserted, the surgeon fills the
chamber 132 with graft medium 155 (again, preferably bone chips), the surgeon then installs thepolyethylene posterior cap 147 to coverposterior end 134 and provide a non-abrasive surface opposing the epidura. - The
implant 120 of FIGS. 14-25 greatly enhances the depth of insertion into opposingvertebrae 100′, 100 a′ through a posterior approach. Namely, anoval bore 154 can be formed having a height, H2 (see FIG. 24) equal to about three times the diameter ofbores 102 described in previous embodiments. This added depth directly into the bone material of thevertebra body 100′, 100 a′ increases the surface area available for grafting to thereby enhance the probability of a successful graft. Also, the increased depth into each of the vertebra bodies provides increased surface to prevent relative rotation of the opposingvertebrae 100′, 100 a′ about the axis of the spine. - The
side walls implant 120 is sized for the upper andlower openings 133 to be located completely above and below, respectively, thedisk layer 114′. Also,plate 136 onend 133 is sized to be about the thickness oflayer 114′ (or slightly greater) to prevent disk material from entering theinterior 132 ofimplant 120.Openings 138 are positioned to oppose only bone ofvertebra 100′, 100 a′. - H. Additional Alternative Embodiments
- FIGS.26-29 show additional alternative embodiments of the present invention. FIG. 26 shows an
implant body 312 extending from aleading end 314 to a trailingend 316. Theleading end 314 has anaxial opening 340 formed therethrough in communication with abody chamber 324. The trailingend 316 has anopening 344 in communication withchamber 324. - A plurality of
threads 326 surround thebody 312. Further, a plurality ofholes 332 are formed through the body. - As shown best in FIG. 27, the
holes 332 do not extend radially from the longitudinal axis X′-X′ of thebody 312. Instead, theholes 332 have their axes Y′-Y′ disposed radially offset from the longitudinal axis X′-X′. By reason of this structure, anenhanced cutting edge 333 is formed which opposes bone as thebody 312 is threaded between the opposing vertebrae. Thecutting edge 333 chips away at the bond forcing bone chips to fall through theholes 332 into thechamber 324. - Also shown in FIGS. 26 and 27, a
central rib 325 is provided withinchamber 324.Rib 325 adds structural integrity to thebody 312. Also, as shown best in FIG. 27, a noncircular opening 327 (in the preferred embodiment of FIG. 27, a triangular-shaped opening 327) is provided. Opening 327 may receive the tip of a turning tool (not shown but similar totool 200 in FIG. 1) which may be inserted within opening 327 to turn thebody 312 as it is being threaded between opposing vertebrae. In FIGS. 28 and 29, abody 412 is provide withthreads 426. The embodiment of FIGS. 28 and 29 surrounds central chamber 424. Arib 425 is provided withinchamber 442.Rib 425 is provided with anoval opening 427 which may receive an oval tool tip (not shown but serving the function oftool tip 200 of FIG. 1). The use of anoval opening 427 in FIG. 29 or atriangular opening 327 in FIG. 27 provides assistance to a surgeon indicating directional alignment of thebody 412 with a patient's vertebrae. - In FIGS. 28 and 29, different-
sized holes implant body 412 and are axially aligned with the longitudinal dimension X″-X″ ofoval opening 427. The axes between opposingholes 532 defines an axial line Y″-Y″ which separates the body into a right and left half (when viewed in FIG. 29). On opposite sides of the line Y″-Y″, holes 432 are provided which are smaller in diameter than holes 532. Similar toholes 332 in FIG. 27, holes 432 are provided with their axes offset from the central axes X″-X″ of FIG. 29 in order to define cuttingedges 433 at the intersection between theholes 432 and thethreads 426. - The
enlarged holes 532 are provided to align with the opposing vertebrae such that theholes 532 oppose the vertebrae after full insertion of thebody 412. Accurate alignment is provided by the surgeon aligning the longitudinal dimension of oval 427 (by operation of an insertion tool not shown) to be in alignment with the vertebrae. When so aligned, thelargest holes 532 oppose the vertebrae bone to insure least resistance to bone growth through thebody 412. When implanting thebody 412, the surgeon will provide a bone slurry filling the implant and theholes body 412. Further, upon implanting thebody 412, the bone from the vertebrae is chipped by cuttingedges 433 intoholes 432. As a result, a solid bone mass is provided through theholes 432 intochamber 442 and surrounding and penetrating theimplant body 412. - From the foregoing detailed description of the present invention, it has been shown how the invention has been attained in a preferred embodiment, including alternative embodiments. However, modifications and equivalents of these concepts are intended to be included within the scope of this invention.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/140,220 US20020183846A1 (en) | 1989-07-06 | 2002-05-06 | Spinal implant |
Applications Claiming Priority (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37665789A | 1989-07-06 | 1989-07-06 | |
US40556489A | 1989-09-08 | 1989-09-08 | |
US70235191A | 1991-05-15 | 1991-05-15 | |
US97305492A | 1992-11-06 | 1992-11-06 | |
US08/299,817 US5489308A (en) | 1989-07-06 | 1994-09-01 | Spinal implant |
US47672395A | 1995-06-07 | 1995-06-07 | |
US08/733,464 US6149686A (en) | 1989-07-06 | 1996-10-16 | Threaded spinal implant with bone ingrowth openings |
US09/422,534 US6391058B1 (en) | 1989-07-06 | 1999-10-21 | Threaded spinal implant with convex trailing surface |
US10/140,220 US20020183846A1 (en) | 1989-07-06 | 2002-05-06 | Spinal implant |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/422,534 Continuation US6391058B1 (en) | 1989-07-06 | 1999-10-21 | Threaded spinal implant with convex trailing surface |
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Publication Number | Publication Date |
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US20020183846A1 true US20020183846A1 (en) | 2002-12-05 |
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ID=27409310
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Application Number | Title | Priority Date | Filing Date |
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US07/972,827 Expired - Lifetime US5458638A (en) | 1989-07-06 | 1992-11-06 | Non-threaded spinal implant |
US08/299,817 Expired - Lifetime US5489308A (en) | 1989-07-06 | 1994-09-01 | Spinal implant |
US08/733,464 Expired - Fee Related US6149686A (en) | 1989-07-06 | 1996-10-16 | Threaded spinal implant with bone ingrowth openings |
US09/361,939 Expired - Fee Related US6287343B1 (en) | 1989-07-06 | 1999-07-27 | Threaded spinal implant with bone ingrowth openings |
US09/422,534 Expired - Fee Related US6391058B1 (en) | 1989-07-06 | 1999-10-21 | Threaded spinal implant with convex trailing surface |
US10/140,220 Abandoned US20020183846A1 (en) | 1989-07-06 | 2002-05-06 | Spinal implant |
Family Applications Before (5)
Application Number | Title | Priority Date | Filing Date |
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US07/972,827 Expired - Lifetime US5458638A (en) | 1989-07-06 | 1992-11-06 | Non-threaded spinal implant |
US08/299,817 Expired - Lifetime US5489308A (en) | 1989-07-06 | 1994-09-01 | Spinal implant |
US08/733,464 Expired - Fee Related US6149686A (en) | 1989-07-06 | 1996-10-16 | Threaded spinal implant with bone ingrowth openings |
US09/361,939 Expired - Fee Related US6287343B1 (en) | 1989-07-06 | 1999-07-27 | Threaded spinal implant with bone ingrowth openings |
US09/422,534 Expired - Fee Related US6391058B1 (en) | 1989-07-06 | 1999-10-21 | Threaded spinal implant with convex trailing surface |
Country Status (1)
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US (6) | US5458638A (en) |
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Also Published As
Publication number | Publication date |
---|---|
US6149686A (en) | 2000-11-21 |
US6287343B1 (en) | 2001-09-11 |
US5458638A (en) | 1995-10-17 |
US6391058B1 (en) | 2002-05-21 |
US5489308A (en) | 1996-02-06 |
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