Surgical cutter instrument with trial
Surgical instruments, systems and methods are described for selecting a size and cutting bone for inserting of an intervertebral disc prosthesis. The surgical instrument includes a combined intervertebral disc prosthesis sizing trial and a slot or channel cutter which is movable with respect to the sizing trial.
1. A surgical cutting instrument comprising:
an instrument shaft having a distal end and a proximal end;
an instrument handle coupled to the proximal end of the instrument shaft;
a trial sizer head configured to couple to the distal end of the instrument shaft and to correspond in size to an intervertebral implant;
a cutter configured to attach to the instrument shaft and to translate relative to the trial sizer head; and
an adjustable stop removably coupled to the instrument shaft and configured to limit axial translation of the trial sizer head;
wherein an axial position of the adjustable stop is adjustable relative to the instrument shaft, and the adjustable stop is releasably secured about the instrument shaft by a lock.
2. The surgical cutting instrument of claim 1 , wherein the trial sizer head comprises a longitudinal slot, and the cutter is configured to translate within the longitudinal slot.
3. The surgical cutting instrument of claim 1 , wherein the adjustable stop is further configured to limit axial translation of the trial sizer head in a proximal direction during movement of the cutter in a distal direction.
4. The surgical cutting instrument of claim 1 , wherein the lock comprises a screw lock.
5. The surgical cutting instrument of claim 1 , wherein the adjustable stop comprises a bone stop surface disposed on a distal end of the adjustable stop, wherein the bone stop surface is configured to abut a surface of a vertebra.
6. The surgical cutting instrument of claim 5 , wherein the adjustable stop comprises a plurality of bone stop surfaces disposed on the distal end of the adjustable stop, wherein each bone stop surface of the plurality of bone stop surfaces is configured to abut a surface of a vertebra.
7. The surgical cutting instrument of claim 5 , wherein the surface of the vertebra is an anterior surface of the vertebra above an implantation level of the intervertebral implant.
8. The surgical cutting instrument of claim 5 , wherein the surface of the vertebra is an anterior surface of the vertebra below an implantation level of the intervertebral implant.
9. The surgical cutting instrument of claim 6 , wherein the adjustable stop comprises four bone stop surfaces disposed on the distal end of the adjustable stop, wherein each of the four bone stop surfaces is configured to abut a surface of a vertebra.
10. The surgical cutting instrument of claim 1 , wherein the instrument shaft comprises a pair of side walls axially extending from the distal end to the proximal end.
11. The surgical cutting instrument of claim 10 , wherein the adjustable stop is removably coupled to a side wall of the pair of side walls.
12. The surgical cutting instrument of claim 11 , wherein an axial position of the adjustable stop is adjustable along a length of the side wall.
13. The surgical cutting instrument of claim 11 , further comprising a second adjustable stop removably coupled to the other side wall of the pair of side walls.
14. The surgical cutting instrument of claim 13 , wherein a portion of the instrument shaft is visible during use.
15. The surgical cutting instrument of claim 13 , wherein the adjustable stop is configured to provide an unobstructed view of a midline of a vertebra and the cutter in use.
16. The surgical cutting instrument of claim 13 , wherein the second adjustable stop comprises a bone stop surface disposed on a distal end of the second adjustable stop, wherein the bone stop surface is configured to abut a surface of a vertebra.
17. The surgical cutting instrument of claim 16 , wherein the second adjustable stop comprises a plurality of bone stop surfaces disposed on a distal end of the second adjustable stop, wherein each bone stop surface of the plurality of bone stop surfaces is configured to abut a surface of a vertebra.
18. A surgical cutting instrument comprising:
an instrument shaft having a distal end and a proximal end;
an instrument handle coupled to the proximal end of the instrument shaft;
a trial sizer head configured to couple to the distal end of the instrument shaft and to correspond in size to an intervertebral implant;
a cutter configured to attach to the instrument shaft and to translate relative to the trial sizer head; and
an adjustable stop removably coupled to the instrument shaft and configured to limit axial translation of the trial sizer head;
wherein the instrument shaft comprises a pair of side walls axially extending from the distal end to the proximal end and the adjustable stop is removably coupled to a side wall of the pair of side walls.
19. The surgical cutting instrument of claim 18 , further comprising a second adjustable stop removably coupled to the other side wall of the pair of side walls.
20. The surgical cutting instrument of claim 18 , wherein the adjustable stop is configured to provide an unobstructed view of a midline of a vertebra and the cutter in use.