WO2006020474A2 - Screw and rod fixation system - Google Patents
Screw and rod fixation system Download PDFInfo
- Publication number
- WO2006020474A2 WO2006020474A2 PCT/US2005/027598 US2005027598W WO2006020474A2 WO 2006020474 A2 WO2006020474 A2 WO 2006020474A2 US 2005027598 W US2005027598 W US 2005027598W WO 2006020474 A2 WO2006020474 A2 WO 2006020474A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insert
- screw
- elongated
- housing
- rest
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
- A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- 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
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
Definitions
- the present invention relates to spinal fixation devices and more particularly to a pedicle screw and rod fixation assembly useful in stabilizing a spine of a patient.
- a rod is disposed longitudinally along the length of the spine in the region of concern.
- the rod is arranged according to the anatomy and the correction desired.
- the rod is aligned along the spine and engages various vertebrae along its length.
- the rod engages, or more typically the parallel rods engage, the spine using fixation elements, such as, anchors attached to vertebral bodies by a bone screw.
- the screw and rod fixation system comprises a bone screw having a threaded portion, a transition, and a head comprising a housing engaging surface and an insert engaging surface.
- the bone screw is provided in a housing with a bone facing surface and a top edge and a sidewall extending therebetween.
- a through hole extends from the top edge to the bone facing surface and a pair of opposing slots reside proximate the top edge.
- the housing has a screw head seating surface that is shaped to cooperatively engage the housing engaging surface to allow polyaxial orientation of the bone screw relative to a vertical axis of the housing.
- a housing couples to the bone screw and housing.
- the insert comprises a screw head engaging surface to cooperatively engage the insert engaging surface to allow polyaxial orientation of the bone screw relative to a vertical axis of the housing and an elongate rod rest shaped to seat a portion of the elongated rod, the elongated rod rest traversing the housing between the pair of opposing slots.
- An elongated rod traverses the housing between the pair of opposed slots and seated in the elongated rod rest.
- the present invention further provides an insert useful in a device that couples spinal rods to vertebral bodies.
- the insert comprises a bone screw engaging surface and an elongated rest coupled to the bone screw engaging surface having an outer edge and a bottom surface opposite the elongated rest.
- a transition portion connects the bone screw engaging surface and the elongated rest.
- the insert cooperatively engage a bone screw to allow polyaxial orientation of the bone screw relative to the insert.
- FIG. 1 shows a perspective view of a screw and rod fixation system in accordance with an embodiment of the present invention
- FIG. 2 shows a cross-sectional view of the system of FIG. 1
- FIG. 3 shows a perspective view of a housing associated with an embodiment of the present invention shown in FIG. 1 ;
- FIG. 4 shows a cross-sectional view of the housing of FIG. 3;
- FIG. 5 shows a perspective view of a bone screw associated with an embodiment of the present invention shown in FIG. 1;
- FIG. 6 shows another perspective view of the bone screw of FIG. 5;
- FIG. 7 shows a perspective view of an insert associated with an embodiment of the present invention shown in FIG. 1;
- FIG. 8 shows a cross-sectional view of the insert of FIG. 7
- FIG. 9 shows a top elevation view of the insert of FIG. 7
- FIG. 10 shows a detailed cross-sectional view of the construct shown in FIG. 2.
- FIG. 1 shows a perspective view of system 100 while FIG. 2 shows a cross-sectional view of system 100.
- System 100 includes a bone screw 102, a housing 104, an insert 106, a rod 108, and a compressive member, such as, a setscrew 110.
- Housing 104 may contain one or more first mating surfaces 112. First mating surfaces 112 are designed to mate with a tool (not specifically shown).
- setscrew 110 typically has one or more second mating surface 114 to mate with a tool (also not shown). As shown in FIG.
- first mating surfaces 112 are actually slots on an outer surface 116 of housing 104. While shown as slots, first mating surfaces 112 may be any number of designs including one or more dimples, hex detents, or other equivalent mechanisms as are known in the art. Second mating surface 114 is shown with a hex shape to accept a hex driver useful in threading the setscrew. Of course, one of ordinary skill in the art would recognize other and equivalent first and second mating surfaces 112, 114 are possible.
- Housing 104 may be referred to as a coupling device, seat, or anchor.
- Housing 104 has a bone facing surface 302, at least one sidewall 304 having an outer surface 116 and an inner surface 306 (best seen in FIG. 4), first mating surfaces 112, a pair of opposed slots 308 in sidewall 304, a top edge 310, and a through hole 312 extending from top edge 310, to bone facing surface 302.
- Housing 104 can be considered to have a rod receiving section 402 and a screw receiving section 404.
- housing 104 is shown with one cylindrically shaped sidewall 304. It is believed providing housing 104 as a cylindrical shape reduces the profile of the device, but other shapes are possible, such as cubic or the like. If housing 104 had multiple sidewalls 304, the edges between the multiple sides should be beveled or rounded to inhibit tissue trauma.
- inner surface 306 has first threads 406 extending partially along inner surface 306. As will be explained below, first threads 406 allow setscrew 110 to be threaded on housing 104. Slots 308 generally have a width Wl sufficiently wide to accept rod 108.
- Insert groove 410 allows provides a mechanism to lock and stabilize insert 106, as will be explained below.
- rod receiving section 402 provides a channel for a single rod 108 to traverse housing 104 from slot 308 to slot 308.
- Housing 104 could be easily converted to provide multiple rod guides.
- housing 104 could have a second set of opposed slots substantially parallel to slots 308.
- a rod cap/seat could be installed below threads 406 and above insert seating surface 408. The rod cap/seat would provide a cap side operatively sized and shaped to fit about rod 108 opposite the insert seating surface 408.
- the rod cap/seat provide a second seating surface operatively sized and shaped to fit about a second rod aligned substantially above rod 108.
- Setscrew 110 would provide compressive force to the substantially aligned rod, which would correspondingly provide compressive force to rod 108 and insert 106, etc.
- inner surface 306 has a screw head seating surface 412.
- Surface 412 has a shape corresponding to the screw head, described below.
- Surface 412 has an upper lip 414 and a lower lip 416.
- Upper lip 414 and lower lip 416 could comprise a beveled edge and/or protrusions.
- Upper lip 414, lower lip 416, and surface 412 cooperative engage the screw head to allow a polyaxial engagement of the screw 102, which will be described below.
- upper lip 414 has a first diameter dl and lower lip 416 has a second diameter d2.
- First diameter dl is larger than second diameter d2.
- Inner surface 306 terminates at bone facing surface 302.
- inner surface 306 flares out from second diameter d2 such that the bone side of through hole 312 has a third diameter d3 larger than second diameter d2, but generally smaller than first diameter dl.
- Outer surface 116 is generally perpendicular to top edge 310 and bone facing surface 302 to conserve space.
- bone facing surface 302 may have a rounded transition 418 between bone facing surface 302 and outer surface 116 to inhibit trauma to tissue.
- top edge 310 has beveled or rounded edges.
- through hole 312 at top edge 310 has a fourth diameter d4. Diameter d4 is sufficiently large to accept the head of screw 102 and setscrew 110.
- Bone screw 102 will now be described with reference to FIGS. 5 and 6.
- Bone screw 102 has a threaded portion 502, a transition portion 504, and a head portion 506.
- Threaded portion 502 can use any conventional thread, but as shown, threaded portion 502 has a shaft 508 and threads 510 machined such that shaft 508 has an increasing diameter from the tip 512 to transition portion 504. Further, threads 510 become relatively thicker towards transition portion 504. Designing threaded portion 502 in this fashion increases the frictional engagement of bone screw 102 in bone and generally increases the screw strength.
- Transition portion 504 comprises the portion of bone screw 102 between threaded portion 502 and head portion 506. Transition portion 504 could be integrated into threaded portion 502. Transition portion 504 may be straight, curved, bowed, flared, or the like to transition threaded portion 502 to head portion 506.
- FIG. 6 shows head 506 of screw 102 in more detail.
- Head 506 has a housing engaging surface 602, an insert engaging surface 604, a top edge 606, and at least one third mating surface 608, which in this case comprises a plurality of grooves.
- Insert engaging surface 604 has a shape corresponding to the insert, as is explained further below.
- Third mating surface 608 is designed to allow a surgeon to thread screw 102 into bone using a driver.
- Housing engaging surface 602 has a shape corresponding to screw head seating surface 412. As shown, screw head seating surface 412 is convex in shape to mate with the concave shaped housing engaging surface 602. Housing engaging surface 602 can rotate relative to screw head seating surface 412. If designed as protrusions, upper lip 414 and lower lip 416 may provide limits on the rotation or angle of screw 102 relative to housing 104. Insert 106 will now be described with reference to FIGS. 7, 8, and 9.
- Insert 106 comprises a screw head engaging surface 702, a transition section 704, and an elongated rod rest 706.
- Screw head engaging surface 702 has a shape that corresponds to insert engaging surface 604.
- insert engaging surface 604 is concave shaped to mate with convexly shaped screw head engaging surface 702.
- the corresponding surfaces 604 and 702 allow polyaxial orientation of screw 102 relative to insert 106.
- insert 106 and housing 104 remain aligned or substantially aligned.
- Transition section 704 is a provides a transition between screw head engaging surface 702 and elongated rod rest 706.
- Transition section 704 is somewhat narrower than the largest diameter of surface 702 to increase the rotational engagement between the screw and insert.
- Elongated rod rest 706 traverses housing 104 between opposing slots
- Elongated rod rest 706 has a bottom surface 708 shaped to fit in insert seating surface 408. Elongated rod rest 706 is shaped to receive rod 108.
- rod rest 706 may be solid as shown or substantially void as a matter of design choice; however, it is believed providing a substantially solid rest provides a more stable construct.
- elongated rod rest 706 has a plurality of tabs 902 formed by slots 904. Each tab 902 has a protrusion 906.
- Insert 106 is placed in housing 104 by compressing tabs 902 as allowed by slots 904 toward rest 706. When compressed, protrusions 906 are a distance d5 apart, where d5 is less than Wl. When compressed, insert 106 can be fitted into through hole 312 of housing 106 until screw head engaging surface 702 rests on insert engaging surface 604. Once surface 702 and surface 604 are in place, the compression on tabs 902 is released and tabs 902 return to the uncompressed state such that protrusion 906 are a distance d6, where d6 is greater than d5 and Wl.
- Protrusions 906 engage groove 410 (FIG. 4) to lock and stabilize insert 106 in housing 104.
- Screw 102 is inserted through through hole 312. Screw 102 is partially driven into bone, not specifically shown in the FIG, until bone facing surface 302 seats on the bone and housing engaging surface 602 engages screw head seating surface 412. Screw 102 may be angled relative to a vertical axis V of housing 104. Also, housing is aligned such that opposing slots 308 will align with rod 108. Screw 102 also may have a polyaxial orientation relative to insert 106. Rod 108 is placed on elongated rod rest 706 and setscrew 110 is threaded into through hole 312 until setscrew 110 contacts rod 108 placing the construct under sufficient compression to stabilize and lock the device in place.
- threads 406 substantially terminate at a top surface 1002 of rod 102. This allows sufficient thread to provide the necessary force without providing unnecessary thread. Thread 406 could stop substantially at or above top surface 1002, but in that case, setscrew 110 should be designed with a boss. The thread design reduces the spreading of the housing 104 when the setscrew is tightened to rod 108.
- the above construct is very stable in part because of the surface-to- surface contacts provided by various engaging surface. Further stability is provided in some instances by the insert coupling with a groove in the housing an providing a surface-to-surface contact between the rod and insert.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05778961A EP1824398B1 (en) | 2004-08-10 | 2005-08-02 | Screw and rod fixation system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/915,902 | 2004-08-10 | ||
US10/915,902 US7766945B2 (en) | 2004-08-10 | 2004-08-10 | Screw and rod fixation system |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2006020474A2 true WO2006020474A2 (en) | 2006-02-23 |
WO2006020474A3 WO2006020474A3 (en) | 2006-12-07 |
Family
ID=35800960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/027598 WO2006020474A2 (en) | 2004-08-10 | 2005-08-02 | Screw and rod fixation system |
Country Status (3)
Country | Link |
---|---|
US (1) | US7766945B2 (en) |
EP (1) | EP1824398B1 (en) |
WO (1) | WO2006020474A2 (en) |
Cited By (1)
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EP1887984A2 (en) * | 2005-05-10 | 2008-02-20 | Roger P. Jackson | Polyaxial bone screw with compound articulation |
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Also Published As
Publication number | Publication date |
---|---|
EP1824398A4 (en) | 2009-04-08 |
US20060036242A1 (en) | 2006-02-16 |
US7766945B2 (en) | 2010-08-03 |
WO2006020474A3 (en) | 2006-12-07 |
EP1824398A2 (en) | 2007-08-29 |
EP1824398B1 (en) | 2012-11-14 |
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