Distractible interspinous process implant and method of implantation

• US 8,888,816 B2
• Filed: 03/16/2010
• Issued: 11/18/2014
• Est. Priority Date: 05/22/2003
• Status: Active Grant

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Zucherman, James F., Hsu, Ken Y., Winslow, Charles J., Flynn, John J., Mitchell, Steven T.
• Primary Examiner(s): Ramana, Anu
• Application Number:
  US12/725,129
• Publication Number:
  US 20100174316A1
• Time in Patent Office: 1,708 Days
• Field of Search: 606/60, 606/246, 606/247, 606/248, 606/249
• US Class Current: 606/249
• 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 at least one cavity disposed between the first part and the second part, the body including a first end defining a distraction guide and a second end defining a first wing, the first part comprising a first portion of the distraction guide and a first portion of the first wing and the second part comprising a second portion of the distraction guide and a second portion of the first wing, the first and second portions of the distraction guide and the first wing being spaced apart by the cavity;

a distracting insert including at least one insert extending from the distracting insert and configured for insertion into the cavity to cojoin and distract apart the first part and the second part, wherein a height of the at least one insert is larger than a height of the cavity, such that when the at least one insert is received in the cavity, the first part and the second part are urged apart.

2. The interspinous implant of claim 1, wherein:

the at least one insert includes a plurality of inserts extending from said distracting insert; and

the at least one cavity includes a plurality of cavities within said body;

each of said plurality of cavities is adapted to receive one of said plurality of inserts;

wherein each of said plurality of cavities includes a first groove formed in said first part and a second groove formed in said second part.

3. 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.

4. The interspinous implant of claim 1, 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.

5. 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.

6. The interspinous implant of claim 1, wherein said distraction guide is wedge-shaped.

7. 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 at least one cavity disposed between the first part and the second part, the body including a first end defining a distraction guide and a second end defining a first wing, the first part comprising a first portion of the distraction guide and a first portion of the first wing and the second part comprising a second portion of the distraction guide and a second portion of the first wing, the first and second portions of the distraction guide and the first wing being spaced apart by the cavity;

a distracting insert including at least one insert extending from the distracting insert and configured for insertion into the cavity to cojoin the first part and the second part, wherein a height of the at least one insert is larger than a height of the cavity, such that when the at least one insert is received in the cavity, the first part and the second part are urged apart, 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.

8. 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 at least one cavity disposed between the first part and the second part, the body including a first end defining a distraction guide and a second end defining a first wing, the first part comprising a first portion of the distraction guide and a first portion of the first wing and the second part comprising a second portion of the distraction guide and a second portion of the first wing, the first and second portions of the distraction guide and the first wing being spaced apart by the cavity; and

a distracting insert including at least one insert extending from the distracting insert and configured for insertion into the cavity to cojoin the first part and the second part, wherein a height of the at least one insert is larger than a height of the cavity, such that when the at least one insert is received in the cavity, the first part and the second part are urged apart;

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

9. 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 and at least one cavity disposed between the first part and the second part, the body including a first end defining a distraction guide and a second end defining a first wing, the first part comprising a first portion of the distraction guide and a first portion of the first wing and the second part comprising a second portion of the distraction guide and a second portion of the first wing, the first and second portions of the distraction guide and the first wing being spaced apart by the cavity;

a plurality of distracting inserts each configured for insertion into the cavity to cojoin the first part and the second part, wherein a height of each of the distracting inserts is larger than a height of the cavity, such that when a respective one of the distracting inserts is received in the cavity, the first part and the second part are urged apart;

wherein at least one of the plurality of distracting inserts has a different maximum height than at least one other of the plurality of distracting inserts configured to space the spinous processes apart a different distance than the at least one other of the plurality of distracting inserts.

10. 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 and at least one cavity disposed between the first part and the second part, the body including a first end defining a distraction guide and a second end defining a first wing, the first part comprising a first portion of the distraction guide and a first portion of the first wing and the second part comprising a second portion of the distraction guide and a second portion of the first wing, the first and second portions of the distraction guide and the first wing being spaced apart by the cavity;

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 each configured for insertion into the cavity to cojoin the first part and the second part, wherein a height of each of the distracting inserts is larger than a height of the cavity, such that when a respective one of the distracting inserts is received in the cavity, the first part and the second part are urged apart;

wherein at least one of the plurality of distracting inserts has a different maximum height than at least one other of the plurality of distracting inserts configured to space the spinous processes apart a different distance than the at least one other of the plurality of distracting inserts.