WO1995015125B1 - Triangular construct for spinal fixation - Google Patents
Triangular construct for spinal fixationInfo
- Publication number
- WO1995015125B1 WO1995015125B1 PCT/US1994/013842 US9413842W WO9515125B1 WO 1995015125 B1 WO1995015125 B1 WO 1995015125B1 US 9413842 W US9413842 W US 9413842W WO 9515125 B1 WO9515125 B1 WO 9515125B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pair
- rod
- fasteners
- elongated
- plates
- Prior art date
Links
- 239000000789 fastener Substances 0.000 claims abstract 20
- 210000000988 Bone and Bones Anatomy 0.000 claims 17
- 230000000875 corresponding Effects 0.000 claims 12
- 230000023298 conjugation with cellular fusion Effects 0.000 claims 3
- 230000013011 mating Effects 0.000 claims 3
- 238000000034 method Methods 0.000 claims 3
- 230000021037 unidirectional conjugation Effects 0.000 claims 3
- 238000005452 bending Methods 0.000 claims 1
Abstract
A spinal system yields a triangular construct (10) across a vertebral body (L4) and a quadrilateral construct (40, 41) between vertebral levels (L4, L5). A first pair of screws (11) are engaged in a vertebra (L4) on opposite sides of the spinal midline (S). A longitudinally splined rod (20), bent into a V-shape, spans between the pair of screws (11) with its vertex generally at the spinal midline (S). An eyebolt fastener (25) includes a serrated aperture (27, 28) to receive the transverse splined rod (20), and a threaded post (30) extending through a yoke (16) in the screws (11). A nut (31) engages the post (30) to clamp eyebolt (25), rod (20) and yoke (16) together. A second set of fasteners (50) is provided to engage a pair of rigid plates (40, 41) to the transverse rod (20), each plate (40, 41) spanning between two vertebral levels (L4, L5) on either side of the spinal midline (S). The other end of each plate (40, 41) is engaged to a similar triangular rod construct (10) in the adjacent vertebra (L5).
Claims
1. A spinal fixation construct engaged to the spine of a patient comprising: a first pair of bone screws each having a head portion and a lower threaded portion configured for engagement in a vertebral body on opposite sides of the spinal midline with the head portion of each bone screw disposed between the spinous process and a transverse process of the vertebra; a first elongated member having a length sufficient to extend laterally across the spinal midline, said member bent into a V-shaped configuration with a vertex generally in the middle of said member; a pair of first fasteners each engaging corresponding opposite ends of said elongated member to the head portion of a corresponding one of said first pair of bone screws such that said vertex is generally aligned with said spinal midline; a pair of elongated plates having one end and an opposite end, said plates configured to be oriented in the superior/inferior direction on opposite sides of the spinal midline; and a pair of second fasteners each clamping said elongated member to said one end of a corresponding one of said pair of elongated plates.
2. The spinal fixation construct of claim 1, wherein: said head portion of each of said pair of bone screws includes a splined surface; and each of said pair of first fasteners includes an 17
interdigitating splined face for mating with said splined surface of a corresponding one of said pair of bone screws to prevent relative rotation between the bone screw and the fastener.
3. The spinal fixation construct of claim 1, wherein: said elongated member is a rod includes longitudinal splines defined around the circumference of said rod; and each of said pair of first fasteners and said pair of second fasteners includes an eyebolt having a body defining an aperture for receiving said elongated rod therethrough, said aperture having a plurality of serrations defined therein for mating with said longitudinal splines of said elongated rod to prevent relative rotation between said rod and said eyebolt.
4. The spinal fixation construct of claim 1, wherein each of said pair of elongated plates is engageable to said elongated member between the spinal midline and a corresponding one of said pair of first fasteners.
5. The spinal fixation construct of claim 1, wherein: each of said pair of elongated plates defines a slot at said one end of said plates; and each of said pair of second fasteners includes a portion configured to extend through said slot of a corresponding one of said plates for engagement of said fasteners thereto at variable superior/inferior locations. 1 8
6. The spinal fixation construct of claim 1, further comprising: a second pair of bone screws each having a head portion and a lower threaded portion configured for engagement into a second vertebral body on opposite sides of the spinal midline; a second elongated member having a length sufficient to extend laterally across the spinal midline; a pair of third fasteners identical to said pair of first fasteners each clamping said second elongated member to the head portion of a corresponding one of said second bone screws; and a pair of fourth fasteners identical to said pair of second fasteners each engaging said second elongated member to said opposite end of a corresponding one of said pair of elongated plates.
7. The spinal fixation construct of claim 6, wherein: each of said first and second elongated members is a rod which includes longitudinal splines defined around the circumference of each rod; and each of said pair of first, second, third and fourth fasteners includes an eyebolt having a body defining an aperture for receiving one of said elongated rods therethrough, said aperture having a plurality of serrations defined therein for mating with said longitudinal splines of the elongated rod to prevent relative rotation between the rod and said eyebolt.
8. The spinal fixation construct of claim 6, wherein: 1 9
each of said pair of elongated plates defines a slot at said one end of said plates; and each of said pair of second fasteners includes a portion configured to extend through said slot of a corresponding one of said plates for engagement of said fasteners thereto at variable superior/inferior locations.
9. The spinal fixation construct of claim 8, wherein: each of said pair of elongated plates further defines a slot at said opposite end of said plates; and each of said pair of fourth fasteners includes a portion configured to extend through said slot of a corresponding one of said plates for engagement of said fasteners thereto at variable superior/inferior locations.
10. A method for instrumenting the spine comprising the steps of: implanting a pair of bone screws into a vertebral body with the head of each screw disposed between the spinal midline and a corresponding transverse process of the vertebra, the axes of the pair of bone screws defining an included angle in the lateral plane; bending an elongated member into a V-shaped configuration with an included angle at the vertex of the member greater than or equal to the included angle between the pair of bone screws; engaging the member to the head of each of the pair of bone screws with the vertex of the member arranged generally at the spinal midline; engaging one end of a pair of 20
elongated plates to the member at a location apart from the bone screws and with the plates arranged on opposite sides of the spinal midline and extending in the superior/inferior direction; and fastening an opposite end of the pair of plates to another vertebral body.
12. The method for instrumenting the spine of claim 10, wherein: the elongated member is a rod which includes a plurality of longitudinal splines around the circumference of the rod; the head of each of the bone screws includes a slot defined therein; and the step of engaging the member to the head of the bone screws includes; sliding a pair of eyebolts onto the rod, each eyebolt defining an aperture with serrations therein for interdigitating with the splines on the rod to prevent relative rotation therebetween, each eyebolt further having a threaded post projecting therefrom; orienting each eyebolt on the rod with the serrations interdigitating with the splines and extending the threaded post through the slot in the head of a corresponding bone screw; and tightening a nut onto each threaded post to clamp the head of the bone screw to the rod.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU12993/95A AU1299395A (en) | 1993-12-02 | 1994-12-02 | Triangular construct for spinal fixation |
EP95904210A EP0731672A4 (en) | 1993-12-02 | 1994-12-02 | Triangular construct for spinal fixation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/159,827 US5403316A (en) | 1993-12-02 | 1993-12-02 | Triangular construct for spinal fixation |
US08/159,827 | 1993-12-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1995015125A1 WO1995015125A1 (en) | 1995-06-08 |
WO1995015125B1 true WO1995015125B1 (en) | 1995-06-29 |
Family
ID=22574230
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/013842 WO1995015125A1 (en) | 1993-12-02 | 1994-12-02 | Triangular construct for spinal fixation |
Country Status (4)
Country | Link |
---|---|
US (1) | US5403316A (en) |
EP (1) | EP0731672A4 (en) |
AU (1) | AU1299395A (en) |
WO (1) | WO1995015125A1 (en) |
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US5261909A (en) * | 1992-02-18 | 1993-11-16 | Danek Medical, Inc. | Variable angle screw for spinal implant system |
AU659912B2 (en) * | 1992-03-10 | 1995-06-01 | Bristol-Myers Squibb Company | Perpendicular rod connector for spinal fixation device |
ZA937672B (en) * | 1992-10-22 | 1994-05-16 | Danek Medical Inc | Spinal rod transverse connector for supporting vertebral fixation elements |
US5498263A (en) * | 1994-06-28 | 1996-03-12 | Acromed Corporation | Transverse connector for spinal column corrective devices |
-
1993
- 1993-12-02 US US08/159,827 patent/US5403316A/en not_active Expired - Lifetime
-
1994
- 1994-12-02 AU AU12993/95A patent/AU1299395A/en not_active Abandoned
- 1994-12-02 WO PCT/US1994/013842 patent/WO1995015125A1/en not_active Application Discontinuation
- 1994-12-02 EP EP95904210A patent/EP0731672A4/en not_active Withdrawn
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