Spine distraction implant and method

• US 8,157,840 B2
• Filed: 06/28/2007
• Issued: 04/17/2012
• Est. Priority Date: 01/02/1997
• Status: Expired due to Fees

• Current Assignee: Kyphon SARL (Medtronic Plc)
• Original Assignee: Kyphon SARL (Medtronic Plc)
• Inventors: Zucherman, James F., Hsu, Ken Y., Winslow, Charles J., Klyce, Henry A., Flynn, John J.
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): HOFFMAN, MARY C
• Application Number:
  US11/770,201
• Publication Number:
  US 20080039858A1
• Time in Patent Office: 1,755 Days
• Field of Search: 606247-249, 606/99, 606/104, 606/86.A, 606/86.B
• US Class Current: 606/248
• CPC Class Codes: A61B 17/66 Alignment, compression or distraction mechanisms
• CPC Class Codes: A61B 17/7047 Clamps comprising opposed elements which grasp one vertebra between them
• 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 17/7068 Devices comprising separate rigid parts, assembled in situ, to bear on each side of spinous processes; Tools therefor
• CPC Class Codes: A61B 17/7071 Implants for expanding or repairing the vertebral arch or wedged between laminae or pedicles; Tools therefor
• CPC Class Codes: A61K 31/37 Coumarins, e.g. psoralen

Abstract

A method of inserting an interspinous-process implant includes using an insertion tool. The insertion tool includes an inner shaft disposed at least partially within an outer shaft. The inner shaft is longitudinally displaceable relative to the outer shaft and rotatably engagable with the implant. The implant is alignable with a first engagement portion on the tool, advantageously when a second engagement portion associated with the inner shaft is retracted.

Claims

1. A method, comprising:

longitudinally displacing an inner second shaft of an insertion tool relative to an outer first shaft of the insertion tool to retract a distal tip of the second shaft proximally toward a handle of the insertion tool;

the first and second shafts extending distally from the handle section;

the second shaft slidably disposed in the first shaft;

the first shaft extending along a first longitudinal axis and having a first pin oriented generally perpendicular to the first axis;

the distal tip of the second shaft extending parallel to the first axis;

while the distal tip is retracted, aligning the first pin of an insertion tool to an interspinous-process implant relative to the insertion tool and displacing the first pin toward the implant in a direction generally perpendicular to the first axis of the tool to couple, at the first pin, the tool with the implant for both distal and proximal movement in a direction parallel to the first axis of the tool;

thereafter, rotatably engaging the distal tip of the insertion tool to the interspinous-process implant by rotating the second shaft relative to the first shaft;

thereafter, inserting the interspinous-process implant into a body while the first pin is aligned with the interspinous-process implant and while the distal tip is rotatably engaged with the interspinous-process implant.

2. The method of claim 1, further comprising:

rotatably disengaging the distal tip from the interspinous-process implant after the inserting;

disengaging the first pin from the interspinous-process implant after the inserting.

3. The method of claim 1, wherein the displacing the first pin toward the implant in a direction generally perpendicular to the first axis of the tool comprises inserting the first pin in a recess in the interspinous-process implant.

4. The method of claim 1 wherein the insertion tool further comprises a resilient member biasing the second shaft longitudinally away from the handle;

and wherein the longitudinally displacing the second shaft to retract the distal tip comprises longitudinally displacing the inner second shaft against a bias force from the resilient member to retract the distal tip.

5. The method of claim 1:

wherein the implant comprises first and second portions;

wherein the second portion is rotatable relative to the first portion and comprises a recess;

wherein, during the inserting the implant into a body, the first pin contacts the first portion and the distal tip is disposed in the recess of the second portion, with the distal tip rotatably coupled to the second portion.

6. The method of claim 1 wherein the first shaft further comprises a second pin extending generally perpendicular to the first longitudinal axis;

wherein, during the inserting the implant into a body, the second pin engages the implant.

7. A method, comprising:

aligning a first engagement portion of an insertion tool to an interspinous-process implant relative to the insertion tool;

the insertion tool having first and second shafts extending along a first longitudinal axis distally from a handle section;

thereafter, rotatably engaging a second engagement portion of the insertion tool to the interspinous-process implant;

the second engagement portion being a distal portion of the second shaft;

inserting the interspinous-process implant into a body after the aligning the first engagement portion of the insertion tool to the interspinous-process implant and after the rotatably engaging the second engagement portion of the insertion tool to the interspinous-process implant;

wherein the aligning includes removably engaging the first engagement portion to the interspinous-process implant from a first direction that is substantially perpendicular to the first axis so as to couple the first engagement portion to the implant for both distal and proximal movement in a direction parallel to the first axis;

wherein the rotatably engaging includes simultaneously;

rotatably engaging the second engagement portion to the interspinous-process implant from a second direction substantially parallel to the first axis; and

slidingly displacing the second shaft distally in and relative to the first shaft.

8. The method of claim 7 wherein the insertion tool further comprises a resilient member biasing the second shaft longitudinally away from the handle section;

wherein slidingly displacing the second shaft distally in and relative to the first shaft comprises slidingly displacing the second shaft distally in and relative to the first shaft against a bias force from the resilient member.