US20050192586A1 - Method of preparing for an artificial intervertebral implant using tool - Google Patents
Method of preparing for an artificial intervertebral implant using tool Download PDFInfo
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- US20050192586A1 US20050192586A1 US11/067,214 US6721405A US2005192586A1 US 20050192586 A1 US20050192586 A1 US 20050192586A1 US 6721405 A US6721405 A US 6721405A US 2005192586 A1 US2005192586 A1 US 2005192586A1
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- implant
- slot
- cutting tool
- vertebral bodies
- tool
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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
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
- A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1662—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body
- A61B17/1671—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans for particular parts of the body for the spine
-
- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- 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
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—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
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
- A61F2002/30649—Ball-and-socket joints
- A61F2002/30654—Details of the concave socket
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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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
- A61F2002/30649—Ball-and-socket joints
- A61F2002/30662—Ball-and-socket joints with rotation-limiting means
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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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
- A61F2002/30649—Ball-and-socket joints
- A61F2002/30665—Dual arrangement of two adjacent ball-and-socket joints
-
- 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
- A61F2002/30795—Blind bores, e.g. of circular cross-section
- A61F2002/30807—Plurality of blind bores
- A61F2002/30808—Plurality of blind bores parallel
-
- 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
- A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
- A61F2002/30891—Plurality of protrusions
- A61F2002/30892—Plurality of protrusions parallel
-
- 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
- A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
-
- 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
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
- A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
- A61F2002/443—Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
-
- 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
- A61F2002/448—Joints for the spine, e.g. vertebrae, spinal discs comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
-
- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- 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
- A61F2002/4625—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 with relative movement between parts of the instrument during use
- A61F2002/4627—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 with relative movement between parts of the instrument during use with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
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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
- 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
Definitions
- This invention relates to tools for preparing vertebral bodies in the spine for the implantation of an artificial vertebral disk replacement and related method.
- This invention also relates to an artificial vertebral disk replacement, a method of operation, and a method of implanting.
- U.S. Pat. No. 4,714,469 to Kenna discloses a spinal implant that fuses vertebrae to the implant.
- the implant has a rigid body that fits between the vertebrae with a protuberance extending from a vertebral contacting surface and into the vertebral body.
- U.S. Pat. No. 5,258,031 to Salib et al. discloses another prosthetic disk with a ball that fits into a socket.
- U.S. Pat. Nos. 5,425,773 and 5,562,738 are related patents to Boyd et al. that disclose a disk arthroplasty device for replacement of the spinal disk. A ball-and-socket are provided to enable rotation.
- U.S. Pat. No. 5,534,029 to Shima discloses an articulated vertebral body spacer with a pair of upper and lower joint pieces inserted between the vertebrae. An intermediate layer is provided to allow for movement between the upper joint piece and the lower joint piece.
- U.S. Pat. No. 5,782,832 to Larsen et al. discloses a two-piece ball-and-socket spinal implant with upper and lower plates for insertion within the intervertebral space.
- U.S. Pat. No. 6,156,067 to Bryan et al. discloses a prosthesis having two plates with a nucleus therebetween.
- the present invention includes embodiments that are directed to a set of tools used to implant an intervertebral disk replacement, and a method of placing the implant between vertebral bodies of the spine.
- a first tool is provided for use in preparing the vertebral bodies for the implant.
- a second tool is provided for installing the implant between the vertebral bodies.
- FIG. 1A is a posterior view of an embodiment of the assembled implant of the invention.
- FIG. 1B is a cross-section of the device shown in FIG. 1A .
- FIG. 1C is a posterior view of two bottom plates of the implant of the embodiment of the invention.
- FIGS. 1D and 1E are posterior views of the embodiment of the implant of the invention shown in FIG. 1A illustrating the operation of the device in bending to the left and bending to the right, respectively.
- FIG. 2A is a side view of the implant of FIG. 1A showing the implant in flexion.
- FIG. 2B is a side view of the implant showing the implant in extension.
- FIG. 2C is a partial cross-sectional view of a side view of the implant of an embodiment of the invention.
- FIG. 2D is a partial cross-sectional view of an alternative embodiment of the implant of the invention having a protuberance adjacent the socket.
- FIG. 3A is a top view of a portion of an embodiment of the assembled implant of the invention.
- FIG. 3B is a top view of an embodiment of the implant of the invention showing a rotation to the right.
- FIG. 3C is a top view of an embodiment of the implant of the invention showing a rotation to the left.
- FIG. 4A is a perspective view of a ball portion of the embodiment of the implant of the invention.
- FIG. 4B is a perspective view of a socket portion of the embodiment of the implant of the invention.
- FIG. 5A is a posterior view of the embodiment of the implant of the invention after being implanted between two vertebral bodies.
- FIG. 5B is a side view of the embodiment of the implant of the invention after being implanted between two vertebral bodies.
- FIG. 6 is a rear view of an alternate embodiment of the invention having two plates.
- FIG. 7A is a top view of an embodiment of a cutting tool of the invention used to prepare the vertebral bodies for the implant.
- FIG. 7B is a side view of the embodiment of the cutting tool of the invention.
- FIG. 7C is a distal end view of an embodiment of the cutting tool of the invention.
- FIG. 7D is a top view of the cutting portion of an alternative embodiment of the cutting tool of the invention showing blade protectors.
- FIG. 7E is a side view of the cutting portion of an alternative embodiment of the cutting tool of the invention showing the blade protectors.
- FIG. 8A is a side view of an embodiment of the implant insertion tool of the invention.
- FIG. 8B is a top view of the embodiment of the implant insertion tool of the invention.
- FIG. 8C is a distal end view of the embodiment of the implant insertion tool of the invention.
- FIG. 8D is a top view of an embodiment of the implant insertion tool holding an embodiment of the implant.
- FIG. 9 is a block diagram illustrating the steps of a method for inserting the implant between vertebral bodies.
- FIG. 1A a posterior view of an intervertebral implant 100 is depicted having a four-piece configuration.
- the intervertebral implant 100 has a pair 130 of first plates 110 .
- Each first plate 110 has a first surface 112 and a second surface 114 .
- the first surface 112 is configured to abut an end plate surface of a vertebral body.
- a keel 116 can be provided on the first surface 112 to anchor the first surface 112 into the vertebral body upon implantation.
- One or more additional protrusions 118 can also be provided that act as a detent or catch, thus providing a further mechanism to prevent the first plate 110 from moving relative to the vertebral body once implanted.
- the intervertebral implant 100 also has a pair 132 of second plates 120 .
- the second plates 120 have a first surface 122 and a second surface 124 .
- the first surface 122 is configured to abut an end plate surface of a vertebral body.
- a keel 126 can be provided on the first surface 122 to anchor the first surface 122 into the vertebral body upon implantation.
- One or more additional protrusions 128 can also be provided that act as a detent or catch, again providing a further mechanism to prevent the second plate 120 from moving relative to the vertebral body once implanted.
- FIG. 1B depicts the pair 130 of upper plates 110 and the pair 132 of lower plates 120 in cross-section.
- Each upper plate 110 has a socket 136 that has a first elongated sidewall 150 , a corresponding second elongated sidewall 152 (shown in FIG. 3B ), an end wall 154 , and an open end 156 .
- the open ends 156 of each of the first plates 110 are oriented so that the open ends 156 face each other.
- the lower plates 120 each have a ball 134 . As illustrated in FIG. 1B , the ball 134 is an elongated ball.
- Each of the plates 110 , 120 has a first end 138 , 141 and a second end 139 , 143 , respectively.
- the ends 139 of the first plate 110 face each other and the ends 143 of the second plate 120 also face each other.
- the ends 138 , 141 are curved and convex, as shown in FIG. 3A , so that the implant 100 has a configuration that correlates to the curved shape of a vertebra.
- the ball 134 has four sides: a first elongated sidewall 140 , a second elongated sidewall 142 , a third end wall 144 , and a fourth end wall 146 .
- the third end wall 144 is flush with the end 143 of the plate 120 of the implant.
- the third end wall 144 has a profile height 160 and the fourth end wall 146 has a profile height 162 . Comparing the profile heights 160 , 162 to each other at the same point on the second surface 124 of the second plate 120 , the overall profile height of the third end wall 144 is greater than the fourth end wall 146 (i.e., 160 > 162 ).
- the upper surface 135 of socket 136 slopes downwardly from the end wall 144 to the end wall 146 .
- balls 134 comprise a ball structure that has a high surface where the third end walls 144 abut each other and slope to a lower surface adjacent to fourth end walls 146 .
- the upper surfaces 135 are barrel shaped and have a “U” shaped profile along a cross-section that is perpendicular to the page of FIG. 1C (parallel the sagittal plane on implantation).
- the sloping upper surface 135 allows the pair 130 of upper plates 110 to easily slide, or rock, side-to-side on the ball structure and slide, or ride, forward and backward with enough looseness of fit to allow for some twisting in order to emulate the motion of the vertebral bone and intervertebral disk tissue.
- This arrangement thus, has a sliding or translating pivot point.
- the edges are eased or rounded to allow for further range of motion of the pair 130 of plates 110 relative to the pair 132 of plates 120 .
- the overall height of the third end wall 144 and the fourth end wall 146 can be equivalent while still having an effective third end wall height 160 that is greater than the effective fourth end wall height 162 due to the overall slope of the second surface 124 .
- the overall height of the third end wall 144 and the fourth end wall 146 can be different with the third end wall 144 having a height greater than the fourth end wall 146 , thus eliminating the need for the second surface 124 to have a slope or further increasing the net difference between the height of the third end wall and the fourth end wall.
- the ball 134 is depicted such that the third end wall 144 is flush with the second end 143 , those of skill in the art will appreciate that the ball 134 could also be configured such that the third end wall 144 was recessed relative to the end 143 of the second plate. In such a configuration, the third end wall 144 and the end 143 would not be flush.
- FIGS. 1D and 1E illustrate posterior views of the implant 100 showing the clearance for left and right lateral bending.
- left and right lateral bending ranges from 3-5°.
- the length L 1 of the ball 134 can be less than the length L 2 of the socket 136 .
- the open ends 156 of the sockets facilitate movement of the balls 134 within the socket 136 to accommodate side-bending movement.
- FIG. 2A is a side view of the intervertebral implant 100 .
- the first plate 110 with this socket 136 and the second plate 120 with the ball portion 134 are depicted.
- the sloping of the second surface 114 of the first plate 110 facilitates rotation of the ball-and-socket joint in an anterior “A” 280 direction and a posterior “P” 282 direction.
- the second surface 114 slopes from a high point at about where the socket is located to low points at the ends 111 and 113 of the plate 110 .
- the implant 100 is positioned to achieve flexion 272 (i.e., forward bending) in a range up to about 150 , but more preferably 100 .
- the second plate 120 can also have channels 264 , 265 or a groove adjacent the ball 134 .
- the channels 264 , 265 can be configured such that it surrounds a portion of the ball 134 or the entire ball 134 .
- the channel allows the sides of the ball 134 to be made more perpendicular so as to create a greater blocking wall thus preventing the socket of the upper plate 100 from moving too much anteriorly or posteriorly relative to the lower plate 120 .
- Either one or both of the keels on the first surface 116 and the second surface 126 can have one or more posteriorly pointing teeth 266 to enable it to more securely engage the vertebral body into which it is implanted.
- the protrusions 128 , as well as the additional protrusions 118 ( FIG. 1A ) can also have posteriorly pointing teeth in order to lock the implant 100 in position in the vertebrae.
- FIG. 2B is an alternate side view of the intervertebral implant 100 wherein the plates 110 , 120 are shown and the ball-and-socket joint is positioned to achieve extension 274 (i.e., backward bending) in a preferable range of up to about 5°.
- extension 274 i.e., backward bending
- FIG. 2C is a cross-section of the side view of the intervertebral implant 100 showing the mating of the ball 134 to the socket 136 .
- FIG. 2D illustrates an alternate embodiment of the first plate 110 wherein the socket 136 has ridges 268 , 269 forming a protuberance that extends into the channel 264 , 265 respectively on the second plate 120 .
- the protuberances 268 , 269 can extend partially into the channel, such as the configuration shown, or can have a channel conforming shape such that when the ball-and-socket joint are moved to achieve flexion 272 or extension 274 the protuberance or ridge 268 , 269 extends into the channels 264 , 265 .
- This embodiment allows the surfaces 114 and 115 of the first plate 110 and the second plate 115 to be flat and non-sloping as shown while still allowing for the implant to emulate forward and backward bending and allow for the blocking of the motion of the socket relative to the ball.
- FIG. 3A a top view of one-half of the intervertebral implant 100 is shown.
- Each of the top first plate 110 and the bottom second plate 120 have a bore 376 for receiving a pin of an implant tool.
- the keel 116 on the first plate 110 is positioned so that it is does not align in the same plane with the keel 126 on the second plate 120 .
- the non-alignment allows for the implant including the keels to be properly positioned between the vertebrae in such a way to accommodate the position of the nerves as the nerves extend out from the between adjacent vertebrae.
- the length of ball 134 from the third end wall 144 to the fourth end wall 146 is shorter than the length of the socket 136 from the end wall 154 to the open end 156 as discussed before.
- FIGS. 3B and 3c show the relative rotation of the upper first plate 110 to the lower second plate 120 to achieve rotation about a central axis 378 . This rotation results in about a 3°-6° rotation about the axis (i.e., 3° of torso twisting in each direction).
- FIG. 4A shows a perspective view of a second plate 120 of the intervertebral implant 100 .
- the second surface 124 of the second plate 120 with the ball 134 and channels or grooves 264 , 265 extending thereabout.
- the channels 264 , 265 are formed on two sides of the ball 134 .
- the channels 264 , 265 can alternatively surround the ball 134 .
- FIG. 4B shows a perspective view of the first plate 110 .
- the first plate 110 has a second surface 114 , as described above, and, extending therefrom is the socket 136 therein.
- the socket 136 of FIG. 4B is configured to mate with the ball 134 of FIG. 4A , as described above.
- FIG. 5A illustrates a posterior view of the implant shown in FIG. 1A implanted between vertebral bodies in a spine.
- FIG. 5A illustrates the spinal column 500 and the cauda equina 504 (a collection of lumbar and sacral nerve roots that fill the caudal end of the spinal cord) with individual nerves 506 exiting the cord between lumbar vertebrae.
- the implant 100 is positioned between two vertebral bodies 520 , 521 such that the keels 116 , 126 do not interfere with the cauda equina 504 and the exiting nerve 506 . As can be seen in FIG.
- the keel 116 of the upper first plates 110 are close together and inboard of the keel 126 of the lower second plate 120 . This allows the lower keels 126 to be clear of the nerves 506 as the nerves exit from between the adjacent vertebrae.
- FIG. 5B illustrates a side view of the implant 100 , such as that shown in FIG. 1A , implanted between vertebral bodies 520 , 521 .
- the implant 100 is implanted so that the ball-and-socket joint enables about a 5° extension (backward bending) and about a 10° flexion (forward bending).
- the ball and socket arrangement crosses the centerline 50 of the implant 100 and extends in a posterior 282 direction.
- the ball-and-socket arrangement can be more centered on the centerline 50 or extend from a position when the implant 100 crosses the centerline 50 and extends in an anterior 280 direction.
- the ball can be approximately bisected by the centerline.
- FIG. 6 illustrates a rear view of an alternate embodiment of the implant shown in FIG. 1A .
- the implant 600 of FIG. 6 is in the form of a two-piece implant 600 having a first plate 610 and a second plate 620 .
- the first plate 610 has a first surface 612 that contacts the vertebral body and has one or more keels 616 and detents 618 for anchoring the first plate 610 into the vertebral body.
- the implant 600 also has a second plate 620 that has a first surface 622 that contacts the vertebral body and has one or more keels 626 and detents 628 for anchoring the second plate 620 into the vertebral body.
- the second surface 614 of the first plate 610 has a socket 632 formed therein while the second surface 624 of the second plate 620 has a ball 630 .
- This implant 600 moves in much the same way as implant 100 described above.
- implant 100 is predominantly designed for a posterior implantation method. However, implant 100 can also be implanted from an anterior direction. Implant 600 is designed for predominantly an anterior implantation approach.
- FIG. 1A and FIG. 6 can be used to create a three-piece implant as will also be appreciated by those of skill in the art.
- the first plate 610 of FIG. 6 with its socket 632 can be combined with two-second plates 120 of FIG. 1A to form an implant.
- the second plate 620 of FIG. 6 and its ball 630 can be combined with two first plates 110 from FIG. 1A to achieve an implant. Neither of these configurations depart from the scope of the invention.
- the implant 100 , 600 can be comprised of any suitable biocompatible material, such as titanium.
- FIG. 7A depicts a top view of a cutting tool 700 used to prepare the vertebral bodies for the implant 100 and FIG. 7B depicts a side view of tool 700 .
- the cutting tool 700 has a handle 710 at its proximal end for controlling the tool during operation.
- the handle 710 can be removable or affixed to the cutting end.
- the distal end 702 of the tool 700 is forked to form two prongs or tines 705 , 706 .
- the end of each tine 705 , 706 has a beveled edge 716 at its distal most end.
- Each tine 705 , 706 also has an inner blade 712 located on an inner upper side and an outer blade 714 located on an outer lower side (shown in FIG. 7C ).
- the inner blades 712 are coplanar with the surface of the inner side of the tine and the outer blades 714 are coplanar with the outer side of the tine.
- the inner blades 712 are oriented to cut a space in a first intervertebral body for the first surface keel 116 of the implant and the outer blades 714 are oriented to cut a space in the facing intervertebral body for the second surface keel 126 .
- the orientation of the blades is such that each of the cuts made for the keels of the implant are offset and avoid the nerves in the cauda equina or exiting the cauda equina.
- FIG. 7C is a view of the distal end of the cutting tool 700 showing the beveled edges 716 of the tines 705 , 706 and the inner blades 712 and outer blades 714 .
- the distance 722 between the inner blades 712 is less than the distance 724 between the outer blades and the height h of the tines approximates the distance between two vertebral bodies or the height of the disk space.
- the blades 712 , 714 extend above and below the tines or the height of the tines.
- the beveled sides of the distal end 716 extend and form at least one of the beveled sides of the blades 712 , 714 .
- FIG. 7D depicts an enlarged top view of the tines 705 , 706 of the distal end of cutting tool 700 with the beveled distal edges 716 .
- FIG. 7E is an enlarged side view of the distal end of cutting tool 700 .
- FIGS. 7D and 7E show the retractable blade protector 720 for the blade 712 positioned in a retracted position. As the cutting tool is inserted between vertebral bodies, the retractable blade protector 720 moves in a posterior direction 715 (i.e., toward the handle 710 ) to expose the inner blade 712 and the outer blade 714 and to enable the blades to cut into the vertebral bodies.
- protectors 720 can be spring biased as desired in order to cover the blade 712 , 714 as the tool 700 is inserted past the nerves.
- the protectors 720 are urged in a posterior direction as the blades 712 , 714 are urged into the vertebral bodies in order to cut channels for the keels.
- Springs 721 provide the desired bias to keep the protectors 720 in a forward position covering the blades 712 , 718 .
- the tool shown in FIG. 7 can be modified such that instead of cutting keel-receiving channels in the upper and lower vertebral bodies at the same time, two tools are provided so that only one vertebral body is cut for keel-receiving channels at a time.
- a first tool having two tines as described above could be provided having a pair of inner blades located on an upper surface of the tines.
- a second tool could be provided having tines as described with a pair of outer blades located on the lower surface of the tines.
- the second tool can have a guide corresponding to the location of the first blade on the first tool to ensure that the second cut is optimally aligned with the first cut.
- a pair of channels can be cut into the upper vertebral body using the first tool. Thereafter a second pair of channels can be cut into the lower vertebral body.
- first tool has a pair of outer blades and the second tool has a pair of inner blades, or where the first tool has upper and lower blades on a first tine (e.g., right tine) and the second tool has upper and lower blades on a second tine (e.g., left tine).
- FIG. 8A depicts the implanting tool used to insert the implant 100 of FIG. 1A between vertebral bodies.
- FIG. 8A is a side view of the implantation tool 800 that has a handle 810 and an implant holder 820 .
- the implant holder 820 has an implant conforming surface 824 and two pins 822 for holding a first plate 110 and a second plate 120 of a first half of the implant 100 .
- the conforming surface 824 is curved to follow the convex outer edges 138 , 139 of the plate 100 , 120 , respectively (shown in FIG. 3A ).
- the implant 100 nests within a conforming surface 824 and is held by pins 822 .
- FIG. 8c shows the distal view of the end of the tool with two pins 822 , 823 for securing the first and second plate of the implant.
- the tool can be rotated by the user 180° to implant the other half of the implant.
- the implant conforming surface 824 of the implant tool would have a mirror image conforming surface provided to capture the implant 600 .
- An additional series of pins, for a total of four, can be provided for holding a first plate 610 and a second plate 620 of the implant 600 , if required.
- the implant 600 would nest within the conforming surface of the “U” shaped cavity.
- kits can be assembled that include an implant 100 (or 600 ) sized for a particular patient.
- the kit could also include several cutting tools 700 and several implanting tools 800 or a single handle that cooperates with cutting ends 702 and implantation ends 820 .
- FIG. 9 is a block diagram showing the steps for implanting an implant.
- the spine is exposed posteriorly 910 .
- the intervertebral disk to be replaced is either partially or completely removed 920 .
- the cutting tool 700 is inserted between the vertebral bodies to create channels in the bodies to receive the keels of the implant. Nerves can be retracted and then the implant holder 810 is used to insert the implant between the vertebral bodies 930 , lining the keels up with the channels created by the cutting tool 700 .
- the nerves are retracted in the other direction and the other plates 100 , 120 are attached to a tool and are implanted.
- the implant first and second plates 110 , 120 are now inserted between the vertebrae, and the keel are placed in the channels prepared by the cutting tool 700 . Once the implant is inserted, the wound is closed 940 .
- the spine is exposed anteriorly 910 .
- the intervertebral disk to be replaced is either partially or completely removed 920 .
- the cutting tool 700 is inserted between the vertebral bodies to create channels in the bodies to receive the keels of the implant.
- the implant is then inserted into an implant holder and the implant tool is used to insert the implant between the vertebral bodies 930 , lining the keels up with the channels created by the cutting tool 700 .
- the wound is closed 940 .
Abstract
Description
- This application is a divisional of U.S. application Ser. No. 10/685,134, filed Oct. 14, 2003 (Attorney Docket No. KLYCD-05009US1), which claims priority to U.S. Provisional Application No. 60/422,011, filed Oct. 29, 2002, entitled “TOOLS FOR IMPLANTING AN ARTIFICIAL VERTEBRAL DISK AND METHOD” (Attorney Docket No. KLYC-01065US2).
- This application is related to U.S. Provisional Patent Application No. 60/422,039, filed Oct. 29, 2002, entitled “ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH TRANSLATING PIVOT POINT AND METHOD” (Attorney Docket No. KLYCD-05007US0), U.S. patent application Ser. No. 10/684,669, filed Oct. 14, 2003, entitled “ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH TRANSLATING PIVOT POINT AND METHOD (Attorney Docket No.: KLYCD-05007US1), U.S. Provisional Patent Application No. 60/422,021, filed Oct. 29, 2002, entitled “ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH CROSSBAR SPACER AND METHOD” (Attorney Docket No. KLYCD-05008US0), U.S. patent application Ser. No. 10/684,668, filed Oct. 14, 2003, entitled “ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH CROSSBAR SPACER AND METHOD” (Attorney Docket No. KLYCD-05008US1), U.S. Provisional Patent Application No. 60/422,022, filed Oct. 29, 2002, entitled “ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH A SPACER AND METHOD” (Attorney Docket No. KLYCD-05010US0), and U.S. patent application Ser. No. 10/685,011, filed Oct. 14, 2003, entitled “ARTIFICIAL VERTEBRAL DISK REPLACEMENT IMPLANT WITH A SPACER AND METHOD” (Attorney Docket No. KLYCD-05010US1), all of which are incorporated herein by reference.
- This invention relates to tools for preparing vertebral bodies in the spine for the implantation of an artificial vertebral disk replacement and related method. This invention also relates to an artificial vertebral disk replacement, a method of operation, and a method of implanting.
- As the present society ages, it is anticipated that there will be an increase in degenerative and dysfunctional spinal disk conditions. Pain associated with such disk conditions can be relieved by medication and/or surgery.
- Over the years, a variety of intervertebral implants have been developed in an effort to relieve the pain associated with such degenerative and dysfunctional disk conditions. For example, U.S. Pat. No. 4,349,921 to Kuntz discloses an intervertebral disk prosthesis. The Kuntz prosthesis is designed to restore the space between the disks.
- U.S. Pat. No. 4,714,469 to Kenna discloses a spinal implant that fuses vertebrae to the implant. The implant has a rigid body that fits between the vertebrae with a protuberance extending from a vertebral contacting surface and into the vertebral body.
- U.S. Pat. No. 5,258,031 to Salib et al. discloses another prosthetic disk with a ball that fits into a socket.
- U.S. Pat. Nos. 5,425,773 and 5,562,738 are related patents to Boyd et al. that disclose a disk arthroplasty device for replacement of the spinal disk. A ball-and-socket are provided to enable rotation.
- U.S. Pat. No. 5,534,029 to Shima discloses an articulated vertebral body spacer with a pair of upper and lower joint pieces inserted between the vertebrae. An intermediate layer is provided to allow for movement between the upper joint piece and the lower joint piece.
- U.S. Pat. No. 5,782,832 to Larsen et al. discloses a two-piece ball-and-socket spinal implant with upper and lower plates for insertion within the intervertebral space.
- U.S. Pat. No. 6,156,067 to Bryan et al. discloses a prosthesis having two plates with a nucleus therebetween.
- None of these solutions provide an implant that restores a wide range of natural movement.
- Accordingly, what is needed is an implant for alleviating such conditions and that restores natural movement.
- The present invention includes embodiments that are directed to a set of tools used to implant an intervertebral disk replacement, and a method of placing the implant between vertebral bodies of the spine. A first tool is provided for use in preparing the vertebral bodies for the implant. A second tool is provided for installing the implant between the vertebral bodies.
- Other aspects, objects, features, and elements of the other embodiments of the invention are described or are evident from the accompanying specification, claims and figures.
-
FIG. 1A is a posterior view of an embodiment of the assembled implant of the invention.FIG. 1B is a cross-section of the device shown inFIG. 1A .FIG. 1C is a posterior view of two bottom plates of the implant of the embodiment of the invention.FIGS. 1D and 1E are posterior views of the embodiment of the implant of the invention shown inFIG. 1A illustrating the operation of the device in bending to the left and bending to the right, respectively. -
FIG. 2A is a side view of the implant ofFIG. 1A showing the implant in flexion.FIG. 2B is a side view of the implant showing the implant in extension.FIG. 2C is a partial cross-sectional view of a side view of the implant of an embodiment of the invention.FIG. 2D is a partial cross-sectional view of an alternative embodiment of the implant of the invention having a protuberance adjacent the socket. -
FIG. 3A is a top view of a portion of an embodiment of the assembled implant of the invention.FIG. 3B is a top view of an embodiment of the implant of the invention showing a rotation to the right.FIG. 3C is a top view of an embodiment of the implant of the invention showing a rotation to the left. -
FIG. 4A is a perspective view of a ball portion of the embodiment of the implant of the invention.FIG. 4B is a perspective view of a socket portion of the embodiment of the implant of the invention. -
FIG. 5A is a posterior view of the embodiment of the implant of the invention after being implanted between two vertebral bodies.FIG. 5B is a side view of the embodiment of the implant of the invention after being implanted between two vertebral bodies. -
FIG. 6 is a rear view of an alternate embodiment of the invention having two plates. -
FIG. 7A is a top view of an embodiment of a cutting tool of the invention used to prepare the vertebral bodies for the implant.FIG. 7B is a side view of the embodiment of the cutting tool of the invention.FIG. 7C is a distal end view of an embodiment of the cutting tool of the invention.FIG. 7D is a top view of the cutting portion of an alternative embodiment of the cutting tool of the invention showing blade protectors.FIG. 7E is a side view of the cutting portion of an alternative embodiment of the cutting tool of the invention showing the blade protectors. -
FIG. 8A is a side view of an embodiment of the implant insertion tool of the invention.FIG. 8B is a top view of the embodiment of the implant insertion tool of the invention.FIG. 8C is a distal end view of the embodiment of the implant insertion tool of the invention.FIG. 8D is a top view of an embodiment of the implant insertion tool holding an embodiment of the implant. -
FIG. 9 is a block diagram illustrating the steps of a method for inserting the implant between vertebral bodies. - The following description is presented to enable any person skilled in the art to make and use the invention. Various modifications to the embodiments described will be readily apparent to those skilled in the art, and the principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present invention as defined by the appended claims. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein. To the extent necessary to achieve a complete understanding of the invention disclosed, the specification and drawings of all patents, patent publications, and patent applications cited in this application are incorporated herein by reference.
- Turning now to
FIG. 1A , a posterior view of anintervertebral implant 100 is depicted having a four-piece configuration. Although, as will be appreciated by those of skill in the art, other configurations, such as a two-piece configuration or a three-piece configuration, are possible without departing from the scope of the invention. As depicted, theintervertebral implant 100 has apair 130 offirst plates 110. Eachfirst plate 110 has afirst surface 112 and asecond surface 114. Thefirst surface 112 is configured to abut an end plate surface of a vertebral body. Akeel 116 can be provided on thefirst surface 112 to anchor thefirst surface 112 into the vertebral body upon implantation. One or moreadditional protrusions 118 can also be provided that act as a detent or catch, thus providing a further mechanism to prevent thefirst plate 110 from moving relative to the vertebral body once implanted. - The
intervertebral implant 100 also has apair 132 ofsecond plates 120. Thesecond plates 120 have afirst surface 122 and asecond surface 124. Thefirst surface 122 is configured to abut an end plate surface of a vertebral body. As with thefirst plate 110, akeel 126 can be provided on thefirst surface 122 to anchor thefirst surface 122 into the vertebral body upon implantation. One or moreadditional protrusions 128 can also be provided that act as a detent or catch, again providing a further mechanism to prevent thesecond plate 120 from moving relative to the vertebral body once implanted. -
FIG. 1B depicts thepair 130 ofupper plates 110 and thepair 132 oflower plates 120 in cross-section. Eachupper plate 110 has asocket 136 that has a firstelongated sidewall 150, a corresponding second elongated sidewall 152 (shown inFIG. 3B ), anend wall 154, and anopen end 156. The open ends 156 of each of thefirst plates 110 are oriented so that the open ends 156 face each other. Thelower plates 120 each have aball 134. As illustrated inFIG. 1B , theball 134 is an elongated ball. Each of theplates first end second end first plate 110 face each other and theends 143 of thesecond plate 120 also face each other. The ends 138, 141 are curved and convex, as shown inFIG. 3A , so that theimplant 100 has a configuration that correlates to the curved shape of a vertebra. - As shown in
FIG. 1C , theball 134 has four sides: a firstelongated sidewall 140, a secondelongated sidewall 142, athird end wall 144, and afourth end wall 146. Thethird end wall 144 is flush with theend 143 of theplate 120 of the implant. Thethird end wall 144 has aprofile height 160 and thefourth end wall 146 has aprofile height 162. Comparing theprofile heights second surface 124 of thesecond plate 120, the overall profile height of thethird end wall 144 is greater than the fourth end wall 146 (i.e., 160>162). Thus, it is evident that theupper surface 135 ofsocket 136 slopes downwardly from theend wall 144 to theend wall 146. Togetherballs 134 comprise a ball structure that has a high surface where thethird end walls 144 abut each other and slope to a lower surface adjacent tofourth end walls 146. Also, preferably, theupper surfaces 135 are barrel shaped and have a “U” shaped profile along a cross-section that is perpendicular to the page ofFIG. 1C (parallel the sagittal plane on implantation). The slopingupper surface 135, as will be explained later, allows thepair 130 ofupper plates 110 to easily slide, or rock, side-to-side on the ball structure and slide, or ride, forward and backward with enough looseness of fit to allow for some twisting in order to emulate the motion of the vertebral bone and intervertebral disk tissue. This arrangement, thus, has a sliding or translating pivot point. Further, as indicated inFIG. 1C , the edges are eased or rounded to allow for further range of motion of thepair 130 ofplates 110 relative to thepair 132 ofplates 120. As will be appreciated by those of skill in the art, the overall height of thethird end wall 144 and thefourth end wall 146 can be equivalent while still having an effective thirdend wall height 160 that is greater than the effective fourthend wall height 162 due to the overall slope of thesecond surface 124. Alternatively, the overall height of thethird end wall 144 and thefourth end wall 146, can be different with thethird end wall 144 having a height greater than thefourth end wall 146, thus eliminating the need for thesecond surface 124 to have a slope or further increasing the net difference between the height of the third end wall and the fourth end wall. - Further, although the
ball 134 is depicted such that thethird end wall 144 is flush with thesecond end 143, those of skill in the art will appreciate that theball 134 could also be configured such that thethird end wall 144 was recessed relative to theend 143 of the second plate. In such a configuration, thethird end wall 144 and theend 143 would not be flush. -
FIGS. 1D and 1E illustrate posterior views of theimplant 100 showing the clearance for left and right lateral bending. Typically, left and right lateral bending ranges from 3-5°. As evident from these figures (andFIG. 1B ), the length L1 of theball 134 can be less than the length L2 of thesocket 136. Further, as shown, the open ends 156 of the sockets facilitate movement of theballs 134 within thesocket 136 to accommodate side-bending movement. -
FIG. 2A is a side view of theintervertebral implant 100. Thefirst plate 110 with thissocket 136 and thesecond plate 120 with theball portion 134 are depicted. As is apparent from the figure, the sloping of thesecond surface 114 of thefirst plate 110 facilitates rotation of the ball-and-socket joint in an anterior “A” 280 direction and a posterior “P” 282 direction. As depicted, thesecond surface 114 slopes from a high point at about where the socket is located to low points at theends plate 110. As shown inFIG. 2A , theimplant 100 is positioned to achieve flexion 272 (i.e., forward bending) in a range up to about 150, but more preferably 100. - As shown in
FIG. 2A , thesecond plate 120 can also havechannels ball 134. Thechannels ball 134 or theentire ball 134. As will be explained below, the channel allows the sides of theball 134 to be made more perpendicular so as to create a greater blocking wall thus preventing the socket of theupper plate 100 from moving too much anteriorly or posteriorly relative to thelower plate 120. - Either one or both of the keels on the
first surface 116 and thesecond surface 126 can have one or moreposteriorly pointing teeth 266 to enable it to more securely engage the vertebral body into which it is implanted. As can be seen inFIG. 2A , theprotrusions 128, as well as the additional protrusions 118 (FIG. 1A ) can also have posteriorly pointing teeth in order to lock theimplant 100 in position in the vertebrae. -
FIG. 2B is an alternate side view of theintervertebral implant 100 wherein theplates -
FIG. 2C is a cross-section of the side view of theintervertebral implant 100 showing the mating of theball 134 to thesocket 136.FIG. 2D illustrates an alternate embodiment of thefirst plate 110 wherein thesocket 136 hasridges channel second plate 120. As will be appreciated by those of skill in the art, theprotuberances flexion 272 orextension 274 the protuberance orridge channels surfaces first plate 110 and thesecond plate 115 to be flat and non-sloping as shown while still allowing for the implant to emulate forward and backward bending and allow for the blocking of the motion of the socket relative to the ball. - Turning now to
FIG. 3A , a top view of one-half of theintervertebral implant 100 is shown. Each of the topfirst plate 110 and the bottomsecond plate 120 have abore 376 for receiving a pin of an implant tool. Thekeel 116 on thefirst plate 110 is positioned so that it is does not align in the same plane with thekeel 126 on thesecond plate 120. As will be explained in further detail later, the non-alignment allows for the implant including the keels to be properly positioned between the vertebrae in such a way to accommodate the position of the nerves as the nerves extend out from the between adjacent vertebrae. Additionally, the length ofball 134 from thethird end wall 144 to thefourth end wall 146 is shorter than the length of thesocket 136 from theend wall 154 to theopen end 156 as discussed before. -
FIGS. 3B and 3c show the relative rotation of the upperfirst plate 110 to the lowersecond plate 120 to achieve rotation about acentral axis 378. This rotation results in about a 3°-6° rotation about the axis (i.e., 3° of torso twisting in each direction). -
FIG. 4A shows a perspective view of asecond plate 120 of theintervertebral implant 100. Thesecond surface 124 of thesecond plate 120 with theball 134 and channels orgrooves FIG. 4A , thechannels ball 134. However, as will be appreciated by those of skill in the art, thechannels ball 134. -
FIG. 4B shows a perspective view of thefirst plate 110. Thefirst plate 110 has asecond surface 114, as described above, and, extending therefrom is thesocket 136 therein. Thesocket 136 ofFIG. 4B is configured to mate with theball 134 ofFIG. 4A , as described above. -
FIG. 5A illustrates a posterior view of the implant shown inFIG. 1A implanted between vertebral bodies in a spine.FIG. 5A illustrates thespinal column 500 and the cauda equina 504 (a collection of lumbar and sacral nerve roots that fill the caudal end of the spinal cord) withindividual nerves 506 exiting the cord between lumbar vertebrae. Theimplant 100 is positioned between twovertebral bodies keels cauda equina 504 and the exitingnerve 506. As can be seen inFIG. 5A , thekeel 116 of the upperfirst plates 110 are close together and inboard of thekeel 126 of the lowersecond plate 120. This allows thelower keels 126 to be clear of thenerves 506 as the nerves exit from between the adjacent vertebrae. -
FIG. 5B illustrates a side view of theimplant 100, such as that shown inFIG. 1A , implanted betweenvertebral bodies implant 100 is implanted so that the ball-and-socket joint enables about a 5° extension (backward bending) and about a 10° flexion (forward bending). In this view the ball and socket arrangement crosses thecenterline 50 of theimplant 100 and extends in aposterior 282 direction. In this embodiment, the ball-and-socket arrangement can be more centered on thecenterline 50 or extend from a position when theimplant 100 crosses thecenterline 50 and extends in an anterior 280 direction. Further, in another preferred embodiment, the ball can be approximately bisected by the centerline. -
FIG. 6 illustrates a rear view of an alternate embodiment of the implant shown inFIG. 1A . Theimplant 600 ofFIG. 6 is in the form of a two-piece implant 600 having afirst plate 610 and asecond plate 620. Thefirst plate 610 has afirst surface 612 that contacts the vertebral body and has one ormore keels 616 anddetents 618 for anchoring thefirst plate 610 into the vertebral body. Theimplant 600 also has asecond plate 620 that has afirst surface 622 that contacts the vertebral body and has one ormore keels 626 anddetents 628 for anchoring thesecond plate 620 into the vertebral body. Thesecond surface 614 of thefirst plate 610 has asocket 632 formed therein while thesecond surface 624 of thesecond plate 620 has aball 630. Thisimplant 600 moves in much the same way asimplant 100 described above. - As will be appreciated by those of skill in the art,
implant 100 is predominantly designed for a posterior implantation method. However,implant 100 can also be implanted from an anterior direction.Implant 600 is designed for predominantly an anterior implantation approach. - Further, a combination of the two embodiments shown in
FIG. 1A andFIG. 6 can be used to create a three-piece implant as will also be appreciated by those of skill in the art. For example, thefirst plate 610 ofFIG. 6 with itssocket 632 can be combined with two-second plates 120 ofFIG. 1A to form an implant. Similarly, thesecond plate 620 ofFIG. 6 and itsball 630 can be combined with twofirst plates 110 fromFIG. 1A to achieve an implant. Neither of these configurations depart from the scope of the invention. It is also to be understood that theimplant - Turning now to
FIGS. 7 and 8 and the tools for preparing the vertebral bodies and implanting theimplant 100 as described.FIG. 7A depicts a top view of acutting tool 700 used to prepare the vertebral bodies for theimplant 100 andFIG. 7B depicts a side view oftool 700. Thecutting tool 700 has ahandle 710 at its proximal end for controlling the tool during operation. As will be appreciated by those of skill in the art, thehandle 710 can be removable or affixed to the cutting end. - The
distal end 702 of thetool 700 is forked to form two prongs ortines tine beveled edge 716 at its distal most end. Eachtine inner blade 712 located on an inner upper side and anouter blade 714 located on an outer lower side (shown inFIG. 7C ). Preferably theinner blades 712 are coplanar with the surface of the inner side of the tine and theouter blades 714 are coplanar with the outer side of the tine. Theinner blades 712 are oriented to cut a space in a first intervertebral body for thefirst surface keel 116 of the implant and theouter blades 714 are oriented to cut a space in the facing intervertebral body for thesecond surface keel 126. The orientation of the blades is such that each of the cuts made for the keels of the implant are offset and avoid the nerves in the cauda equina or exiting the cauda equina. -
FIG. 7C is a view of the distal end of thecutting tool 700 showing thebeveled edges 716 of thetines inner blades 712 andouter blades 714. Thedistance 722 between theinner blades 712 is less than thedistance 724 between the outer blades and the height h of the tines approximates the distance between two vertebral bodies or the height of the disk space. Theblades FIG. 7C , the beveled sides of thedistal end 716 extend and form at least one of the beveled sides of theblades -
FIG. 7D depicts an enlarged top view of thetines tool 700 with the beveleddistal edges 716.FIG. 7E is an enlarged side view of the distal end of cuttingtool 700.FIGS. 7D and 7E show theretractable blade protector 720 for theblade 712 positioned in a retracted position. As the cutting tool is inserted between vertebral bodies, theretractable blade protector 720 moves in a posterior direction 715 (i.e., toward the handle 710) to expose theinner blade 712 and theouter blade 714 and to enable the blades to cut into the vertebral bodies. Theseprotectors 720 can be spring biased as desired in order to cover theblade tool 700 is inserted past the nerves. Theprotectors 720 are urged in a posterior direction as theblades Springs 721 provide the desired bias to keep theprotectors 720 in a forward position covering theblades - As will be appreciated by those of skill in the art, the tool shown in
FIG. 7 can be modified such that instead of cutting keel-receiving channels in the upper and lower vertebral bodies at the same time, two tools are provided so that only one vertebral body is cut for keel-receiving channels at a time. For example, a first tool having two tines as described above could be provided having a pair of inner blades located on an upper surface of the tines. A second tool could be provided having tines as described with a pair of outer blades located on the lower surface of the tines. Optionally, the second tool can have a guide corresponding to the location of the first blade on the first tool to ensure that the second cut is optimally aligned with the first cut. In use, a pair of channels can be cut into the upper vertebral body using the first tool. Thereafter a second pair of channels can be cut into the lower vertebral body. Alternate arrangements are also possible, for example, where the first tool has a pair of outer blades and the second tool has a pair of inner blades, or where the first tool has upper and lower blades on a first tine (e.g., right tine) and the second tool has upper and lower blades on a second tine (e.g., left tine). -
FIG. 8A depicts the implanting tool used to insert theimplant 100 ofFIG. 1A between vertebral bodies.FIG. 8A is a side view of theimplantation tool 800 that has ahandle 810 and animplant holder 820. Theimplant holder 820 has animplant conforming surface 824 and twopins 822 for holding afirst plate 110 and asecond plate 120 of a first half of theimplant 100. The conformingsurface 824 is curved to follow the convexouter edges plate FIG. 3A ). Theimplant 100 nests within a conformingsurface 824 and is held bypins 822.FIG. 8c shows the distal view of the end of the tool with twopins - Where an implant such as that shown in
FIG. 6 is implanted, theimplant conforming surface 824 of the implant tool would have a mirror image conforming surface provided to capture theimplant 600. An additional series of pins, for a total of four, can be provided for holding afirst plate 610 and asecond plate 620 of theimplant 600, if required. Theimplant 600 would nest within the conforming surface of the “U” shaped cavity. - A variety of kits can be assembled that include an implant 100 (or 600) sized for a particular patient. The kit could also include
several cutting tools 700 and several implantingtools 800 or a single handle that cooperates with cutting ends 702 and implantation ends 820. -
FIG. 9 is a block diagram showing the steps for implanting an implant. In order to implant the implant ofFIG. 1A , the spine is exposed posteriorly 910. The intervertebral disk to be replaced is either partially or completely removed 920. Thecutting tool 700 is inserted between the vertebral bodies to create channels in the bodies to receive the keels of the implant. Nerves can be retracted and then theimplant holder 810 is used to insert the implant between thevertebral bodies 930, lining the keels up with the channels created by thecutting tool 700. Next, the nerves are retracted in the other direction and theother plates second plates cutting tool 700. Once the implant is inserted, the wound is closed 940. - In order to implant the implant of
FIG. 6 , the spine is exposed anteriorly 910. The intervertebral disk to be replaced is either partially or completely removed 920. Thecutting tool 700 is inserted between the vertebral bodies to create channels in the bodies to receive the keels of the implant. The implant is then inserted into an implant holder and the implant tool is used to insert the implant between thevertebral bodies 930, lining the keels up with the channels created by thecutting tool 700. Once the implant is inserted, the wound is closed 940. - The foregoing description of embodiments of the present invention has been provided for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations will be apparent to the practitioner skilled in the art. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, thereby enabling others skilled in the art to understand the invention and the various embodiments and with various modifications that are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalence.
Claims (20)
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US11/067,214 US20050192586A1 (en) | 2002-10-29 | 2005-02-25 | Method of preparing for an artificial intervertebral implant using tool |
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US11/067,214 Abandoned US20050192586A1 (en) | 2002-10-29 | 2005-02-25 | Method of preparing for an artificial intervertebral implant using tool |
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Also Published As
Publication number | Publication date |
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AU2003283027A8 (en) | 2004-05-25 |
AU2003283027A1 (en) | 2004-05-25 |
WO2004039284A2 (en) | 2004-05-13 |
WO2004039284A3 (en) | 2005-03-03 |
US20040143270A1 (en) | 2004-07-22 |
US7497859B2 (en) | 2009-03-03 |
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