System for stabilizing the cervical and the lumbar region of the spine

• US 5,470,333 A
• Filed: 06/10/1993
• Issued: 11/28/1995
• Est. Priority Date: 03/11/1993
• Status: Expired due to Fees

• Current Assignee: Salut, Ltd.
• Original Assignee: Danek Medical, Inc. (Medtronic Plc)
• Inventors: Ray, R. Charles
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): TUCKER, GUY V
• Application Number:
  US08/075,239
• Time in Patent Office: 901 Days
• Field of Search: 606/61, 606/60, 606/69, 606/71, 606/105, 606/72, 606/73
• US Class Current: 606/261
• CPC Class Codes: A61B 17/7043 with a longitudinal element fixed to one or more transverse elements which connect multiple screws or hooks
• CPC Class Codes: A61B 17/7055 connected to sacrum, pelvis or skull

Abstract

A system for achieving reduction of curvature of the lumbar region of the spine associated with spondylolisthesis includes a hook assembly attached to vertebra L4, transverse plates affixed to vertebrae L4 and L5, and sacral plates affixed to opposite sides of the sacrum. The hooks and the plates in combination with the longitudinal plate along the posterior anterior plane in which the spinous processes lie allows for effective reduction of the curvature and secure fixation of this region of the spine. A related system for stabilizing the cervical region of the spine includes transverse plates affixed to vertebrae C3, C4, and C5. These plates in combination with a longitudinal plate allows for effective stabilization. The transverse plates include textured surfaces that allow them to mate in a manner which prevents undesirable slippage therebetween. The system is also compact and does not interfere with the paraspinal muscles which run along either side of the spinous processes.

Claims

1. A system for stabilizing the lumbar region of the spine and reducing displacement of the spine resulting from spondylolisthesis comprising:

first and second transverse plates for securing to vertebra L4;

third and fourth transverse plates for securing to vertebra L5, said first, second, third, and fourth transverse plates each including at one end an eye plate that includes an eye for receiving a bone engaging fastener along a first axis and extending from the eye plate two substantially parallel spaced-apart fingers of substantially equal length, said spaced-apart fingers including a posterior surface and an opposing anterior surface, the anterior surface of said spaced-apart fingers of said first and third transverse plates being textured and the posterior surface of said spaced-apart fingers of said second and fourth transverse plates being textured, wherein the anterior surface of said spaced-apart fingers of said first and third transverse plates face the posterior surface of said spaced apart fingers of said second and fourth transverse plates, respectively;

first and second sacral plates, said sacral plates each including a substantially planar body having a plurality of bores for rigidly fixing said sacral plates independently to opposite lateral portions of a sacrum, extending from each body are two spaced-apart fingers of substantially equal length having posterior and opposing anterior surfaces, the anterior surface of the spaced-apart fingers of said first sacral plate being textured and the posterior surface of the spaced-apart fingers of said second sacral plate being textured, wherein the anterior surface of the spaced-apart fingers of said first sacral plate face the posterior surface of the spaced apart fingers of the second sacral plate;

longitudinal member including a superior end and an inferior end connected by spaced-apart members, said superior and inferior end and said spaced-apart members defining a slot in said longitudinal member;

a first fastener for securing the first and second transverse plates to one another and to the longitudinal member, the first fastener extending between the spaced-apart fingers of the first and second transverse plates and between the spaced-apart members of the longitudinal member when fastened;

a second fastener for securing the third and fourth transverse plates to one another and to the longitudinal member, the second fastener extending between the spaced-apart fingers of the third and fourth transverse plates and between the spaced-apart members of the longitudinal member when fastened;

a third fastener for securing the first and second sacral plates to one another and to the longitudinal member, the third fastener extending between the spaced-apart fingers of the first and second sacral plates and between the spaced-apart members of the longitudinal member; and

a hook assembly for securing to vertebra L3 and said longitudinal member.

2. The system of claim 1, wherein the textured surfaces of said spaced-apart fingers include a repetitive pattern having an amplitude sufficient to prevent slippage between the textured surfaces when secured together by said fasteners.

3. The system of claim 1, wherein a longitudinal centerline runs parallel to and between the spaced-apart fingers of said first and second transverse plates, said first axis being offset from said centerline such that said longitudinal centerline does not intersect said first axis.

4. The system of claim 1, wherein a longitudinal centerline runs parallel to and between the spaced-apart fingers of said third and fourth transverse plates, said first axis being offset from said centerline such that said centerline does not intersect said first axis.

5. The system of claim 1, wherein said hook assembly comprises a hook and a threaded member, said hook and said threaded member extending from opposites sides of a hook assembly body, said hook opening in an inferior direction.

6. The system of claim 5, wherein the hook includes a tip and a shaft, the shaft extending from the hook assembly body and the tip extending from the shaft at an end opposite the hook assembly body.

7. The system of claim 6, wherein the tip is spaced apart from the hook assembly body a distance sufficient to enable the hook to be positioned over the superior surface of the vertebra with the tip in the vertebral canal.

8. A system for stabilizing the lumbar region of the spine and reducing displacement of the spine resulting from spondylolisthesis comprising:

first and second transverse plates for securing to vertebra L4;

third and fourth transverse plates for securing to vertebra L5, said first, second, third, and fourth transverse plates each including at one end an eye plate that includes an eye for receiving a pedicle screw along a first axis and extending from the eye plate two substantially parallel spaced-apart fingers of substantially equal length, said spaced-apart fingers including a posterior surface and an opposing anterior surface, the anterior surface of said spaced-apart fingers of said first and third transverse plates being textured and the posterior surface of said spaced-apart fingers of said second and fourth transverse plates being textured;

first and second sacral plates, said sacral plates each including a substantially planar body having a plurality of bores for rigidly fixing said sacral plates independently to opposite lateral portions of a sacrum, extending from each body are two spaced-apart fingers of substantially equal length having posterior and opposing anterior surfaces, the anterior surface of the spaced-apart fingers of said first sacral plate being textured and the posterior surface of the spaced-apart fingers of said second sacral plate being textured;

longitudinal member including a superior end and an inferior end connected by spaced-apart members, said superior and inferior end and said spaced-apart members defining a slot in said longitudinal member;

fasteners for securing the spaced-apart fingers of said first, second, third and fourth traverse plates, and the spaced-apart fingers of said first and second sacral plates to said longitudinal member;

a hook assembly for securing to vertebra L3 and said longitudinal member;

wherein the fasteners comprise;

a carriage bolt that includes a head, a flange for fitting into said slot, and a thread portion, said flange located between said head and said threaded portion and having a thickness substantially equal to the combined thickness in a posterior to anterior direction of the spaced-apart fingers of said first and second transverse plates;

a primary nut including a textured posterior surface and an opposing textured anterior surface;

a washer, said washer including an annular body with an outer perimeter and two opposing flanges extending in a posterior direction from opposite edges on the outer perimeter of said washer; and

a secondary nut.

9. A system for stabilizing the spine comprising:

first and second transverse plates for securing to a first vertebra;

third and fourth transverse plates for securing to a second vertebra;

fifth and sixth transverse plates for securing to a third vertebra, said first, second, third, fourth, fifth, and sixth transverse plates each including at one end an eye plate that includes an eye for receiving a screw along a first axis, extending from the eye plate in a substantially medial direction is an intermediate plate, one end of the intermediate plate connected to the eye plate and another end of the intermediate plate connected to two substantially parallel spaced-apart fingers of substantially equal length extending in a medial direction substantially transverse to the first axis, said spaced-apart fingers including a posterior surface and an opposing anterior surface, the anterior surface of said spaced-apart fingers of said first, third, and fifth transverse plates being textured and the posterior surface of said spaced-apart fingers of said second, fourth, and sixth transverse plates being textured, wherein the anterior surface of said spaced-apart fingers of said first, third and fifth transverse plates face the posterior surface of said spaced-apart fingers of said second, fourth and sixth transverse plates, respectively;

longitudinal member including a superior end and an inferior end connected by spaced-apart members, said superior and inferior end and said spaced-apart member defining a slot in said longitudinal member;

a first fastener for securing the first and second transverse plates to one another and to the longitudinal member, the first fastener extending between the spaced-apart fingers of the first and second transverse plates and between the spaced-apart members of the longitudinal member when fastened;

a second fastener for securing the third and fourth transverse plates to one another and to the longitudinal member, the second fastener extending between the spaced-apart fingers of the third and fourth transverse plates and between the spaced-apart members of the longitudinal member when fastened; and

a third fastener for securing the fifth and sixth transverse plates to one another and to the longitudinal member, the third fastener extending between the spaced-apart fingers of the fifth and sixth transverse plates and between the spaced-apart members of the longitudinal member.

10. The system of claim 9, wherein the textured surfaces of said spaced-apart fingers include a repetitive pattern having an amplitude sufficient to prevent slippage between the textured surfaces when secured together by said fasteners.

11. The system of claim 9, wherein the first axis is angled in a substantially superior direction and in a substantially lateral direction.

12. The system of claim 11, wherein the eye plate includes an anterior surface and an opposing posterior surface, the anterior surface and the posterior surface being substantially perpendicular to the first axis.

13. The system of claim 9, further comprising a hook assembly for securing to the first vertebra and said longitudinal member.

14. The system of claim 9, wherein the first axis is angled in a substantially inferior direction and in a substantially medial direction.

15. A system for stabilizing the spine comprising:

first and second transverse plates for securing to a first vertebra;

third and fourth transverse plates for securing to a second vertebra;

fifth and sixth transverse plates for securing to a third vertebra, said first, second, third, fourth, fifth and sixth transverse plates each including at one end an eye plate that includes an eye for receiving a screw along the first axis, extending from the eye plate in a substantially redial direction is an intermediate plate, one end of the intermediate plate connected to the eye plate and another end of the intermediate plate, connected to two substantially parallel spaced-apart fingers of substantially equal length extending in a medial direction substantially transverse to the first axis, said spaced-apart fingers including a posterior surface and an opposing surface, the anterior surface of said spaced-apart fingers of said first, third and fifth transverse plates being textured and the posterior surface of said spaced-apart fingers of second, fourth and sixth transverse plates being textured;

longitudinal member including a superior end and inferior end connected by spaced-apart members, said superior and inferior end and said spaced-apart members defining a slot in said longitudinal plates;

fasteners for securing the spaced-apart fingers of said first, second, third, fourth, fifth and sixth transverse plates to said longitudinal members;

wherein the fasteners comprise;

a carriage bolt that includes a head, a flange for fitting into said slot, and a threaded portion, said flange located between said head and said threaded portion and having a thickness substantially equal to the combined thickness in a posterior to anterior direction of the spaced-apart fingers of said first and second transverse plates;

a primary nut including a textured posterior surface and an opposing textured anterior surface;

a washer, said washer including an annular body with an outer perimeter and two opposing flanges extending in a posterior direction from opposite edges on the outer perimeter of said washer; and

a secondary nut.

16. A system for stabilizing the cervical region of the spine comprising:

first and second transverse plates for securing to vertebra C3;

third and fourth transverse plates for securing to vertebra C4;

fifth and sixth transverse plates for securing to vertebra C5, said first, second, third, fourth, fifth and sixth transverse plates each including at one end an eye plate that includes an eye for receiving a lateral mass screw along a first axis, extending from the eye plate in a substantially medial posterior direction is an intermediate plate, one end of the intermediate plate connected to the eye plate and another end of the intermediate plate connected to two substantially parallel spaced-apart fingers of substantially equal length extending in a medial direction substantially transverse to the first axis, said spaced-apart fingers including a posterior surface and an opposing anterior surface, the anterior surface of said spaced-apart fingers of said first, third, and fifth transverse plates being textured and the posterior surface of said spaced-apart fingers of said second, fourth and sixth transverse plates being textured, wherein the anterior surface of said spaced-apart fingers of said first, third and fifth transverse plates face the posterior surface of said spaced-apart fingers of said second, fourth and sixth transverse plates, respectively;

longitudinal member including a superior end and an inferior end connected by spaced-apart members, said superior and inferior end and said spaced-apart members defining a slot in said longitudinal member;

a first fastener for securing the first and second transverse plates to one another and to the longitudinal member, the first fastener extending between the spaced-apart fingers of the first and second transverse plates and between the spaced-apart members of the longitudinal member when fastened;

a second fastener for securing the third and fourth transverse plates to one another and to the longitudinal member, the second fastener extending between the spaced-apart fingers of the third and fourth transverse plates and between the spaced-apart members of the longitudinal member when fastened; and

a third fastener for securing the fifth and sixth transverse plates to one another and to the longitudinal member, the third fastener extending between the spaced-apart fingers of the fifth and sixth transverse plates and between the spaced-apart members of the longitudinal member.

17. A system for stablilzing the lumbar region of the spine and reducing displacement of the spine resulting from spondylolisthesis, comprising:

a first transverse plate adapted for connection to a left portion of a first vertebra, the first transverse plate including a first slot therein;

a second transverse plate adapted for connection to a right portion of the first vertebra, the second transverse plate including a second slot therein;

a third transverse plate adapted for connection to a left portion of a second vertebra, the third transverse plate including a third slot therein;

a fourth transverse plate adapted for connection to a right portion of the second vertebra, the fourth transverse plate including a fourth slot therein;

a longitudinal member having a longitudinal slot defined therein;

a first fastener for securing the first and second transverse plates to one another and to the longitudinal member, the first fastener passing through the first, second, and longitudinal slots when fastened;

a second fastener for securing the third and fourth transverse plates to one another and to the longitudinal member, the second fastener passing through the third, fourth, and longitudinal slots when fastened; and

a hook assembly for securing to a third vertebra and said longitudinal member;

wherein the first and second transverse plates include respective first and second textured surfaces, the first and second textured surfaces adapted to engage one another when the first fastener is fastened; and

wherein the third and fourth transverse plates include respective third and fourth textured surfaces, the third and fourth textured surfaces adapted to engage one another when the second fastener is fastened.

18. The system of claim 17, wherein the first, second, third and fourth textured surfaces include a repetitive pattern having an amplitude sufficient to substantially prevent slippage between engaged textured surfaces when fastened together by the first and second fasteners.

19. The system of claim 17, further comprising:

a first sacral plate adapted for connection to a left pedicle of a sacrum, the first sacral plate including a fifth slot therein;

a second sacral plate adapted for connection to a right pedicle of the sacrum, the second sacral plate including a sixth slot therein; and

a third fastener for securing the first and second sacral plates to one another and to the longitudinal member, the third fastener passing through the fifth, sixth, and longitudinal slots when fastened.

20. The system of claim 17, wherein the first fastener comprises:

a first carriage bolt that includes a first head, a first flange for fitting into the first and second slots, and a first threaded portion, the first flange located between the first head and the first threaded portion and having a thickness substantially equal to a combined thickness of the first and second transverse plates;

a first primary nut;

a first washer, the first washer including an annular body having a surface, and two opposing flanges extending in a direction perpendicular to the surface; and

a first secondary nut.