Interspinous process apparatus and method with a selectably expandable spacer

• US 7,306,628 B2
• Filed: 10/14/2003
• Issued: 12/11/2007
• Est. Priority Date: 10/29/2002
• Status: Active Grant

• Current Assignee: Medtronic Europe SARL (Medtronic Plc)
• Original Assignee: St. Francis Medical Technologies, Inc. (Medtronic Plc)
• Inventors: Zucherman, James F., Winslow, Charles J., Hsu, Ken Y.
• Primary Examiner(s): Philogene; Pedro
• Application Number:
  US10/684,847
• Publication Number:
  US 20040181282A1
• Time in Patent Office: 1,519 Days
• Field of Search: 623 1711- 1716, 606/61
• US Class Current: 623/17.11
• CPC Class Codes: A61B 17/7065 Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor

Abstract

The present invention is an interspinous process implant with a selectably expandable spacer that can be placed between adjacent spinous processes.

Claims

1. An implant adapted to be placed between spinous processes comprising:

a body having a shaft extending therefrom;

a spacer rotatably mounted on the shaft that is adapted to fit between spinous processes, the spacer including a first portion and a second portion; and

a threaded screw rotatably mounted on the shaft between the first portion and second portion; and

an actuatable spreading device rotatably mounted on the threaded screw to adjust the height of the spacer in order to adjust the spacing between the spinous processes.

2. The implant of claim 1 wherein the actuatable spreading device is a slotted sphere that engages the first and second portion of the spacer to maintain the profile height.

3. The implant of claim 2 wherein the slotted sphere engages a screw extending from between first and second portion of the spacer to maintain the profile height.

4. An implant adapted to be placed between spinous processes comprising:

a body having a shaft extending therefrom;

a spacer rotatably mounted on the shaft, the spacer including a first portion and a second portion; and

a mechanism positioned between the first portion and the second portion that can adjust a space between the first and second portion, wherein the mechanism of the implant further comprises a threaded screw rotatably mounted on the shaft, and

an actuatable spreading device engaging threads of the threaded screw, wherein the actuatable spreading device further comprises a slotted sphere.

5. The implant of claim 4 wherein the slotted sphere engages the first and second portion of the spacer to maintain a profile height.

6. The implant of claim 4 wherein the slotted sphere is rotatably mounted on the threaded screw to maintain a profile height.

7. An implant adapted to be placed between spinous processes comprising:

a body having a shaft extending therefrom;

a wing extending from the shaft and adapted to be placed adjacent a first and a second spinous process;

a tissue expander extending from the distal end of the shaft;

said body including a spacer that is rotatably mounted to the shaft, the spacer having a first portion and a second portion; and

a mechanism that is mounted to the spacer and that can adjust the spacing between the first and second portions of the spacer.

8. The implant of claim 7 wherein the spacer is elliptical in shape with the first portion and the second portion divided about a major axis of the elliptical shaped spacer.

9. The implant of claim 7 wherein the first portion and the second portion of the spacer are connected by a hinge.

10. The implant of claim 7 wherein the mechanism of the implant further comprises a slotted sphere.

11. The implant of claim 10 wherein the slotted sphere engages the first and second portion of the spacer to maintain the profile height.

12. The implant of claim 10 wherein the slotted sphere engages a screw extending from between the first and second portion of the spacer to maintain the profile height.

13. The implant of claim 7 wherein the mechanism of the implant further comprises a jack.

14. The implant of claim 13 wherein the jack engages the first and second portion of the spacer to maintain the profile height.

15. The implant of claim 13 where the said jack is adjustable to a greater profile and a lesser profile by turning a screw in one of a first direction and a second direction.

16. A implant adapted to be placed between spinous processes comprising:

a body having a shaft extending therefrom;

a tissue expander extending from the distal end of the shaft;

a spacer rotatably mounted on the shaft, the spacer having a first portion and a second portion, wherein the spacer has an adjustable profile;

a threaded screw rotatably mounted on the shaft between the first portion and second portion; and

a slotted sphere rotatably mounted on the threaded screw.

17. The implant of claim 16 wherein

the slotted sphere engages the first and second portion of the spacer to maintain a profile height.

18. The implant of claim 17 wherein the slotted sphere engages the threaded screw to maintain a profile height.

19. An implant to be placed between spinous processes comprising:

a body having a shaft extending therefrom; and

a spacer that is rotatably mounted on the shaft, wherein the spacer has a first portion and a second portion;

a threaded screw rotatably mounted on the shaft between the first portion and second portion; and

a device rotatably mounted on the threaded screw to adjust a space between the first portion and the second portion;

wherein the device of the implant further comprises a slotted sphere.

20. The implant of claim 19 wherein the slotted sphere engages the first and second portion of the spacer to maintain the profile height.

21. An implant adapted to be placed between spinous processes comprising:

a body having a shaft extending therefrom;

a spacer rotatably mounted on the shaft that is adapted to fit between spinous processes, the spacer including a first portion and a second portion; and

an actuatable spreading device including a threaded screw rotatably mounted on the shaft between the first and second portion,

wherein the spreading device is actuatable to adjust the height of the spacer in order to adjust the spacing between the spinous processes.

22. The implant of claim 21, wherein the actuatable spreading device further includes a slotted sphere engaging the threaded screw.

23. An implant adapted to be placed between spinous processes comprising:

a body having a shaft extending therefrom;

a spacer rotatably mounted on the shaft that is adapted to fit between spinous processes, the spacer including a first portion and a second portion; and

an actuatable spreading device rotatably mounted on the shaft between the first and second portion, the spreading device including a threaded screw rotatably mounted on the shaft between the first portion and second portion and a slotted sphere rotatably mounted on the threaded screw;

wherein the spreading device is actuatable to adjust the height of the spacer in order to adjust the spacing between the spinous processes.