Instruments for expandable corpectomy spinal fusion cage

Patent metadata

Field	Value
Publication number	US-RE46261-E
Application number	US-201414458322-A
Country	US
Kind code	E1
Filing date	Aug 13, 2014
Priority date	Dec 19, 2007
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

An instrument set for an intervertebral expandable spacer having a pair of co-axial annuluses locked together by an engagement member, the set including an inserter/expander having both a rapid expansion mechanism and a fine tuning expansion mechanism.

First claim

We claim:

1. An inserter/expander instrument comprising:
a) a first longitudinal member having a distal end portion adapted for engaging a first vertebral surface, an intermediate portion, and a proximal portion,
b) a second longitudinal member having a distal end portion adapted for engaging a second vertebral surface, and an intermediate portion, and a proximal portion,
c) first and second cross bars distally pivotally attached to the longitudinal members at distal pivots; pivotally attached together at a third pivot; and slidably attached at their respective proximal ends to the opposing longitudinal member by a pin and groove arrangement,
d) a first expansion actuation mechanism attached to the proximal portion of the first longitudinal member, the expansion actuation mechanism adapted to incrementally distally advance the proximal portion of the first cross bar to expand the distal portions of the longitudinal members, and
e) a second expansion actuation mechanism attached to the proximal portion of the first longitudinal member, the second expansion actuation mechanism adapted to incrementally distally advance the proximal portion of the first cross bar to expand the distal portions of the longitudinal members,
wherein the second expansion mechanism comprises a knob having a threaded shaft extending therefrom, the thread of the shaft mating with a thread upon on an internal diameter of a tube located with within the first longitudinal member, and
wherein the shaft of the knob is connected to the pin of the pin and groove arrangement, so that distal movement of the shaft of the knob results in an opening of the cross bars.

2. The instrument of claim 1 wherein the first expansion mechanism comprises a pistol grip comprising a handle and lever pivotally attached to the handle.

3. The instrument of claim 2 wherein the lever is pivotally attached to a shaft located within the proximal portion of the first longitudinal member.

4. The instrument of claim 1 wherein the proximal portion of the first longitudinal member is cannulated.

5. The instrument of claim 1, wherein the first longitudinal member distal end portion is adapted for engaging a first vertebral surface and the second longitudinal member distal end portion is adapted for engaging a second vertebral surface.

6. The instrument of claim 1, wherein the first longitudinal member distal end portion and the second longitudinal member distal end portion are each modular.

7. The instrument of claim 6, wherein the first longitudinal member modular distal end portion is adapted for engaging a first vertebral surface and the second longitudinal member modular distal end portion is adapted for engaging a second vertebral surface.

8. The instrument of claim 6, wherein the first longitudinal member modular distal end portion and the second longitudinal member modular distal end portion are each adapted for holding an expandable implant.

9. The instrument of claim 1, wherein the first longitudinal member distal end portion and the second longitudinal member distal end portion are each adapted for holding an expandable implant.

Assignees

• Depuy Synthes Products Llc
• Depuy Synthes Products Inc

Inventors

• Sommerich Robert E
• Presbrey Glen Arthur
• Meer Martin
• Pohl Gerhard
• Ray Katherine Herard

Classifications

• A61F2002/30593

  hollow · CPC title

• A61F2220/0025

  Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements · CPC title

• A61F2002/30507

  using a threaded locking member, e.g. a locking screw or a set screw · CPC title

• A61F2002/2835

  Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material · CPC title

• A61F2002/4622

  having the shape of a forceps or a clamp · CPC title