Distractible interspinous process implant and method of implantation

• US 20050010293A1
• Filed: 05/20/2004
• Published: 01/13/2005
• Est. Priority Date: 05/22/2003
• Status: Active Grant

• Current Assignee: Medtronic Europe SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Flynn, John J., Zucherman, James F., Winslow, Charles J., Hsu, Ken Y., Mitchell, Steve
• Granted Patent: US 7,695,513 B2
• Time in Patent Office: Days
• US Class Current: 623/17.110
• 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 embodiment of the present invention can includes a distractible implant comprising a distracting insert and a body having a first part and a second part adapted to be positioned between adjacent spinous processes of cervical vertebrae. The distracting insert can be inserted into cavities of the body, thereby urging apart the first part and second part, and distracting the adjacent spinous processes.

Claims

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

a body adapted to be inserted between the spinous processes, the body including a first part and a second part; and

a distracting insert to cojoin and distract apart the first part and the second part.

2. The interspinous implant of claim 1, wherein said body includes a distraction guide.

3. The interspinous implant of claim 2, wherein said body includes a first wing located distally from said distraction guide.

4. The interspinous implant of claim 1, further comprises:

one or more inserts extending from said distracting insert; and

one or more cavities within said body;

said one or more cavities adapted to receive said one or more inserts;

wherein said one or more cavities includes a first groove formed in said first part and a second groove formed in said second part.

5. The interspinous implant of claim 4, wherein a height of said one or more inserts is larger than a height of a respective cavity, such that when said one or more inserts is received in the respective cavity, said first part and said second part are urged apart.

6. The interspinous implant of claim 1, wherein:

said distracting insert includes a clip, the clip having a first tab and a second tab; and

when said distracting insert is seated in said body, said clip resists relative movement between said distracting insert and said body.

7. The interspinous implant of claim 3, further comprising:

a second wing adapted to be connected with said body so that a portion of the spinous processes are positioned between said first wing and said second wing.

8. The interspinous implant of claim 1, wherein:

said body comprises one of a biocompatible thermoplastic and a surgical grade metal; and

said distracting insert comprises one of a biocompatible thermoplastic and a surgical grade metal.

9. The interspinous implant of claim 1, further comprising:

one or more alignment features extending from one of said first part and said second part; and

one or more receiving features corresponding to said one or more alignment features formed in the other of said first part and said second part and adapted to receive said one or more alignment features.

10. The interspinous implant of claim 9, wherein said one or more alignment features are one or more pins, and said one or more receiving features are one or more holes.

11. The interspinous implant of claim 2, wherein said distraction guide is wedge-shaped.

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

a body adapted to be inserted between the spinous processes, the body including a first part and a second part;

a distracting insert to cojoin the first part and the second part.

13. The interspinous implant of claim 12, wherein said body includes a distraction guide.

14. The interspinous implant of claim 13, wherein said body includes a first wing located distally from said distraction guide.

15. The interspinous implant of claim 12, further comprises:

one or more inserts extending from said distracting insert; and

one or more cavities within said body;

said one or more cavities adapted to receive said one or more inserts;

wherein said one or more cavities includes a first groove formed in said first part and a second groove formed in said second part.

16. The interspinous implant of claim 12, wherein:

said distracting insert includes a clip, the clip having a first tab and a second tab; and

when said distracting insert is seated in said body, said clip resists relative movement between said distracting insert and said body.

17. The interspinous implant of claim 14, further comprising:

a second wing adapted to be connected with said body so that a portion of the spinous processes are positioned between said first wing and said second wing.

18. The interspinous implant of claim 12, wherein:

said body comprises one of a biocompatible thermoplastic and a surgical grade metal; and

said distracting insert comprises one of a biocompatible thermoplastic and a surgical grade metal.

19. The interspinous implant of claim 12, further comprising:

one or more alignment features extending from one of said first part and said second part; and

one or more receiving features corresponding to said one or more alignment features formed in the other of said first part and said second part and adapted to receive said one or more alignment features.

20. The interspinous implant of claim 19, wherein said one or more alignment features are one or more pins, and said one or more receiving features are one or more holes.

21. The interspinous implant of claim 13, wherein said distraction guide is wedge-shaped.

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

a body adapted to be inserted between the spinous processes, the body including a first part and a second part;

a distracting insert to distract apart the first part and the second part.

23. The interspinous implant of claim 22, wherein said body includes a distraction guide.

24. The interspinous implant of claim 23, wherein said body includes a first wing located distally from said distraction guide.

25. The interspinous implant of claim 22, further comprises:

one or more inserts extending from said distracting insert; and

one or more cavities within said body;

said one or more cavities adapted to receive said one or more inserts;

wherein said one or more cavities includes a first groove formed in said first part and a second groove formed in said second part.

26. The interspinous implant of claim 25, wherein a height of said one or more inserts is larger than a height of a respective cavity, such that when said one or more inserts is received in the respective cavity, said first part and said second part are urged apart.

27. The interspinous implant of claim 24, further comprising:

a second wing adapted to be connected with said body so that a portion of the spinous processes are positioned between said first wing and said second wing.

28. The interspinous implant of claim 22, wherein:

said body comprises one of a biocompatible thermoplastic and a surgical grade metal; and

said distracting insert comprises one of a biocompatible thermoplastic and a surgical grade metal.

29. The interspinous implant of claim 22, further comprising:

one or more alignment features extending from one of said first part and said second part; and

one or more receiving features corresponding to said one or more alignment features formed in the other of said first part and said second part and adapted to receive said one or more alignment features.

30. The interspinous implant of claim 29, wherein said one or more alignment features are one or more pins, and said one or more receiving features are one or more holes.

31. The interspinous implant of claim 23, wherein said distraction guide is wedge-shaped.

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

a body adapted to be inserted between the spinous processes, the body including a first part and a second part;

a distracting insert to cojoin and distract apart the first part and the second part, the distracting insert including a clip; and

wherein when the distracting insert is seated within the body, the clip resists relative movement between the body and the distracting insert.

33. A system for distracting adjacent spinous processes, comprising:

a plurality of bodies, each of the bodies having a first part and a second part; and

a distracting insert to cojoin and distract apart the first part and the second part;

wherein at least one of the plurality of bodies has a different shape than at least one other of the plurality of bodies.

34. The system of claim 33, wherein each body includes a first wing;

and

the system further comprising;

a plurality of second wings, each second wing connectable with said body such that a portion of the spinous processes are positioned between the first wing and the second wing;

wherein each of the plurality of second wings is sized according to a shape of a corresponding body.

35. A system for distracting adjacent spinous processes, comprising:

a body adapted to be inserted between the spinous processes, the body including a first part and a second part;

a plurality of distracting inserts to cojoin and distract apart the first part and the second part;

wherein at least one of the plurality of distracting inserts has a different distraction height than at least one other of the plurality of spacers.

36. The system of claim 35, wherein said body includes a first wing;

and

the system further comprising;

a plurality of second wings, each second wing connectable with said body such that a portion of the spinous processes are positioned between the first wing and the second wing;

wherein each of the plurality of second wings is sized according to a distraction height of a corresponding distracting insert.

37. A system for distracting adjacent spinous processes, comprising:

a plurality of implants, each of the plurality of implants including a body having a first part and a second part;

wherein at least one of the plurality of bodies has a different shape than at least one other of the plurality of bodies;

a plurality of distracting inserts to cojoin and distract apart the first part and the second part;

wherein at least one of the plurality of distracting inserts has a different distraction height than at least one other of the plurality of spacers.

38. The system of claim 37, wherein each body includes a first wing;

and

the system further comprising;

a plurality of second wings, each second wing connectable with said body such that a portion of the spinous processes are positioned between the first wing and the second wing;

wherein each of the plurality of second wings is sized according to a shape of a corresponding body and a distraction height of a corresponding distracting insert.

39. A method for insertion of an interspinous implant between spinous processes comprising the steps of:

accessing first and second spinous processes;

inserting a body between the spinous processes, which body includes a first part and a second part;

inserting a distracting insert between the first part and the second part in order to distract the first part and the second part apart and in order to cojoin the first part and the second part.

40. The method of claim 39, further comprising:

seating the distracting insert with the body; and

forming an interference fit between the distracting insert and the body.

41. A method for insertion of an interspinous implant between spinous processes comprising the steps of:

accessing first and second spinous processes;

inserting a body between the spinous processes, which body includes a first part and a second part;

inserting a distracting insert between the first part and the second part in order to cojoin the first part and the second part.

42. The method of claim 41, further comprising:

seating the distracting insert with the body; and

forming an interference fit between the distracting insert and the body.

43. A method for insertion of an interspinous implant between spinous processes comprising the steps of:

accessing first and second spinous processes;

inserting a body between the spinous processes, which body includes a first part and a second part;

inserting a distracting insert between the first part and the second part in order to distract the first part and the second part apart.