Dynamized interspinal implant

Patent metadata

Field	Value
Publication number	US-9662149-B2
Application number	US-201615149132-A
Country	US
Kind code	B2
Filing date	May 8, 2016
Priority date	Mar 6, 2004
Publication date	May 30, 2017
Grant date	May 30, 2017

Abstract

An interspinous process having a narrowed distal portion.

First claim

We claim:

1. An implant, comprising:
a) a body portion having a first end, a second end, an upper portion having an upper surface adapted to bear upon an upper vertebra, and a lower portion having a lower surface adapted to bear upon a lower vertebra, wherein the body portion tapers substantially continuously posteriorly from the first end to the second end,
b) a flange extending vertically from the lower portion,
c) a screw extending into the flange, the screw having a longitudinal axis and a head portion, and
d) a spring contacting the head portion of the screw, the spring having a longitudinal axis, wherein the longitudinal axis of the screw is substantially parallel to the longitudinal axis of the spring.

2. The implant of claim 1 , wherein an end portion of the flange comprises a cup having a substantially annular sidewall.

3. The implant of claim 2 , wherein the spring sits freely in and bears against the cup.

4. The implant of claim 1 , wherein the body portion is monolithic.

5. The implant of claim 1 , wherein a thickness of the body portion is greater at the first end than at the second end.

6. An implant, comprising:
a) a body portion having a first end, a second end, an upper portion having an upper surface adapted to bear upon an upper vertebra, and a lower portion having a lower surface adapted to bear upon a lower vertebra, wherein the body portion tapers from the first end to the second end,
b) a flange extending vertically from the upper or lower portion,
c) a screw extending into the flange, and
d) a spring contacting the screw, the spring being configured to expand and contract in a direction that is substantially perpendicular to an anterior-posterior axis extending between the first and second ends of the implant.

7. The implant of claim 6 , wherein the spring is configured to expand and contract in a direction that is substantially parallel to a height direction between the upper and lower surfaces of the implant.

8. The implant of claim 6 , wherein an end portion of the flange comprises a cup having a substantially annular sidewall.

9. The implant of claim 8 , wherein the spring sits freely in and bears against the cup.

10. The implant of claim 6 , wherein the flange extends from the lower portion.

11. The implant of claim 6 , wherein the body portion is monolithic.

12. The implant of claim 6 , wherein a thickness of the body portion is greater at the first end than at the second end.

13. A method of treating a spinal condition, comprising:
implanting between adjacent vertebra an implant comprising:
a) a body portion having an anterior end, a posterior end, an upper portion having an upper surface adapted to bear upon an upper vertebra and a lower portion having a lower surface adapted to bear upon a lower vertebra,
b) a flange extending substantially vertically from the lower portion,
c) a screw extending into the flange, and
d) a spring contacting a head portion of the screw,

wherein the implant is implanted in an orientation whereby the body portion tapers towards the spinal cord.

14. The method of claim 13 , wherein the implant is implanted such that the spring substantially lies in a sagittal plane of the patient.

15. The method of claim 13 , wherein the spring is configured to expand and contract in a sagittal plane of the patient.

16. The method of claim 13 , wherein the body portion is monolithic.

17. The method of claim 13 , wherein a thickness of the body portion is greater at the anterior end than at the posterior end.

Assignees

• Depuy Synthes Products Inc

Inventors

• Serhan Hassan
• Dinello Alexander Michel
• Christianson William

Classifications

• A61B17/7065 Primary

  Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor · CPC title

• A61B2017/567

  Joint mechanisms or joint supports in addition to the natural joints and outside the joint gaps · CPC title

• A61B17/7062 Primary

  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 title

• A61F2/4405

  for apophyseal or facet joints, i.e. between adjacent spinous or transverse processes (devices implanted between spinous or transverse processes A61B17/7062) · CPC title

• A61B2017/00075

  Motion · CPC title