Percutaneous spinal implants and methods

• US 8,221,458 B2
• Filed: 10/30/2007
• Issued: 07/17/2012
• Est. Priority Date: 02/17/2005
• Status: Active Grant

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Malandain, Hugues F., Edidin, Avram Allan
• Primary Examiner(s): Robert, Eduardo C.
• Assistant Examiner(s): CARTER, TARA ROSE E
• Application Number:
  US11/928,424
• Publication Number:
  US 20080058935A1
• Time in Patent Office: 1,722 Days
• Field of Search: 606246-249, 606/86.A, 606/99, 606/104, 623/17.11, 623 1714- 1716
• US Class Current: 606/246
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1608 the two jaw elements being linked to two elongated shaft elements moving longitudinally relative to each other
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 17/7047 Clamps comprising opposed elements which grasp one vertebra between them
• 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 17/7065 Devices with changeable shape, e.g. collapsible or having retractable arms to aid implantation; Tools therefor
• CPC Class Codes: A61B 17/8863 Apparatus for shaping or cutting osteosynthesis equipment by medical personnel
• CPC Class Codes: A61B 2017/00557 inflatable A61B2017/22051 takes precedence
• CPC Class Codes: A61B 2017/0256 for the spine

Abstract

A method includes moving a spinal implant such that a central portion of the spinal implant is disposed between adjacent spinous processes, radially extending a proximal portion of the spinal implant on a first side of the adjacent spinous processes such that movement of the proximal portion between the adjacent spinous processes is inhibited, and radially extending a distal portion of the spinal implant on a second side of the adjacent spinous processes opposite the first side such that movement of the distal portion between the adjacent spinous processes is inhibited.

Claims

1. An apparatus, comprising:

an implant having a first portion configured to be disposed between adjacent spinous processes;

an insertion tool having a housing defining an opening, a cam disposed within an interior of the housing, and a cam follower having a portion disposed within the opening;

the cam follower having a maximum size greater than a maximum size of the opening;

the insertion tool configured to be inserted into the implant when the cam is in a first position;

the insertion tool configured to deform a second portion of the implant via the cam follower when the cam is in a second position.

2. The apparatus of claim 1, wherein the cam is rotatably disposed within the interior of the housing;

the cam being in moveable contact with the cam follower and the cam follower being at least partially disposed within the opening during a range of motion of the cam.

3. The apparatus of claim 1, wherein a maximum cross-sectional width of the implant after the second portion of the implant is deformed is greater than a maximum cross-sectional width of the implant before the second portion of the implant is deformed.

4. The apparatus of claim 1, wherein a maximum cross-sectional width of the cam and the cam follower when the cam is in the second position is greater than a maximum cross-sectional width of the cam and the cam follower when the cam is in the first position.

5. The apparatus of claim 1, wherein the second portion of the implant is between the first portion of the implant and an end of the implant.

6. The apparatus of claim 1, wherein the insertion tool is configured to be rotated a full rotation when disposed within the implant and the cam is in the second position such that the second portion of the implant has an annular shape.

7. The apparatus of claim 1, wherein the cam follower is a first cam follower;

wherein the opening is a first opening;

wherein the housing of the insertion tool defines a second opening;

wherein the insertion tool includes a second cam follower at least partially disposed within the second opening.

8. The apparatus of claim 1, wherein:

the cam follower is a first cam follower;

the opening is a first opening;

the housing of the insertion tool defines a second opening;

the insertion tool includes a second cam follower at least partially disposed within the second opening;

the insertion tool is configured to be rotated a half rotation when disposed within the implant and the cam is in the second position such that the second portion of the implant has an annular shape.

9. An apparatus, comprising:

an implant having a portion configured to be disposed between adjacent spinous processes;

a cam assembly having a cam and a spherical cam follower;

the cam assembly configured to deform the implant via the spherical cam follower when the cam assembly is rotated while disposed within an interior of the implant;

wherein the cam assembly includes a housing defining a substantially circular opening;

the spherical cam follower being at least partially disposed within the opening.

10. The apparatus of claim 9, wherein the cam has a surface having a curved shape;

the surface of the cam being in moveable contact with the cam follower during a range of motion of the cam.

11. The apparatus of claim 9, wherein the cam follower is a first cam follower;

wherein the cam assembly includes a second cam follower;

wherein the cam assembly configured to deform the implant via the second spherical cam follower when the cam assembly is rotated while disposed within an interior of the implant.

12. A method, comprising:

inserting percutaneously an implant such that a first portion of the implant is disposed between adjacent spinous processes;

inserting into an interior of the implant an insertion tool having a housing defining an opening, a cam disposed within an interior of the housing and a cam follower having a portion disposed within the opening, the cam follower having a maximum size greater than a maximum size of the opening; and

while the insertion tool is inserted in the implant, rotating the cam from a first position to a second position such that a second portion of the implant is deformed by the cam follower.

13. The method of claim 12, wherein a maximum cross-sectional width of the implant after the rotating is greater than a maximum cross-sectional width of the implant before the rotating.

14. The method of claim 12, wherein a maximum cross-sectional width of the cam and the cam follower when the cam is in the second position is greater than a maximum cross-sectional width of the cam and the cam follower when the cam is in the first position.

15. The method of claim 12, wherein the second portion of the implant is between the first portion of the implant and an end of the implant.

16. The method of claim 12, further comprising rotating the insertion tool a full rotation such that the second portion of the implant has an annular shape.

17. A method, comprising:

providing an apparatus comprising;

an implant having a first portion configured to be disposed between adjacent spinous processes;

a cam assembly having a cam and a spherical cam follower;

the cam assembly configured to deform the implant via the spherical cam follower when the cam assembly is rotated while disposed within an interior of the implant;

the cam assembly including a housing defining a substantially circular opening;

the spherical cam follower being at least partially disposed within the opening;

inserting percutaneously the implant such that the first portion of the implant is disposed between adjacent spinous processes; and

rotating, after the inserting, the cam assembly having the cam and the spherical cam follower such that the cam follower is moved away from a center of the cam assembly and a second portion of the implant is deformed by the cam follower.

18. The method of claim 17, wherein rotating comprises rotating , the cam assembly a full rotation such that the second portion of the implant has an annular shape.

19. The method of claim 17, wherein the rotating including rotating the cam from a first position to a second position such that the cam follower is moved a first distance from the center of the cam assembly to a second distance from the center of the cam assembly greater than the first distance.

20. The method of claim 17, further comprising:

rotating, after the inserting and the rotating, the cam assembly such that a third portion of the implant is deformed by the cam follower, the first portion of the implant being between the second portion of the implant and the third portion of the implant.

21. The method of claim 17, further comprising:

rotating, after the inserting and the rotating, the cam assembly such that a third portion of the implant is deformed by the cam follower, the first portion of the implant being between the second portion of the implant and the third portion of the implant, a maximum cross-sectional width of the implant including the second portion of implant being greater than a maximum distance between the adjacent spinous processes, and

a maximum cross-sectional width of the implant including the third portion of implant being greater than a maximum distance between the adjacent spinous processes.