Interspinous process implant having a thread-shaped wing and method of implantation

• US 8,147,548 B2
• Filed: 03/17/2006
• Issued: 04/03/2012
• Est. Priority Date: 03/21/2005
• Status: Active Grant

• Current Assignee: Medtronic Europe SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Zucherman, James F., Hsu, Ken Y., Winslow, Charles J., Flynn, John J., Mitchell, Steve, Yerby, Scott A., Markwart, John A.
• Primary Examiner(s): Barrett, Thomas C.
• Assistant Examiner(s): LAWSON, MATTHEW JAMES
• Application Number:
  US11/378,892
• Publication Number:
  US 20060265066A1
• Time in Patent Office: 2,209 Days
• Field of Search: 606/60, 606246-279, 623 1711- 1716, 411/16, 411 24- 25, 411/32, 411/340
• US Class Current: 623/17.11
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 17/7062 Devices acting on, attached to, or simulating the effect of, vertebral processes, vertebral facets or ribs rib fixation devices A61B17/8076; Tools for such devices
• CPC Class Codes: A61B 17/7068 Devices comprising separate rigid parts, assembled in situ, to bear on each side of spinous processes; Tools therefor

Abstract

Systems and method in accordance with an embodiment of the present invention can includes an implant comprising a spacer and a frame having a central body and a helical shaped wing extending from the central body. The frame can be positioned near about adjacent spinous processes, and can be rotated and urged so that the adjacent spinous processes pass within a groove of the wing, thereby allowing the wing to be arranged on an opposite side of the adjacent spinous processes. The spacer can then be arranged over the frame so that the spacer contacts and distracts the spinous processes, thereby limiting relative movement of the adjacent spinous processes during extension.

Claims

1. An interspinous implant adapted to be inserted between spinous processes, the implant comprising:

a frame including;

a central body having a first end and a second end;

a first wing extending from the second end;

the first wing including a first slot and a second slot;

a second wing extending from the first end;

wherein the second wing is approximately thread-shaped;

a spacer adapted to be associated with the frame such that the spacer is received over at least a portion of the central body;

the spacer includes a first portion adapted to be received over the central body through the first slot and a second portion adapted to be received over the central body through the second slot.

2. The implant of claim 1 wherein the second wing has successive turns that are longitudinally spaced from each other so as to define a groove that curves around the longitudinal axis.

3. The implant of claim 1 wherein the second wing is helical.

4. The implant of claim 3 wherein the second wing extends a substantially constant distance from the longitudinal axis.

5. The implant of claim 1 wherein the spacer longitudinally spans substantially all of the distance between the first and second wings.

6. The implant of claim 1 wherein the second wing is movable between an expanded configuration and a collapsed configuration.

7. The implant of claim 1:

wherein the central body has a longitudinal axis extending between the first end and the second end;

wherein the first wing is larger in a dimension perpendicular to the longitudinal axis than the spacer;

wherein the first end comprises a tapered distraction guide that narrowingly tapers away from the second end.

8. The implant of claim 1 wherein the spacer is sized and configured to span a majority of a length of the central body between the first wing and the second wing.

9. The implant of claim 1 wherein the spacer includes a longitudinal cavity.

10. The implant of claim 1 wherein the implant comprises Nitinol and a biocompatible polymer.

11. The implant of claim 10 wherein the biocompatible polymer is PEEK.