Surgical instrument for impacting and extracting a cutting instrument

Patent metadata

Field	Value
Publication number	US-9320529-B2
Application number	US-201313963350-A
Country	US
Kind code	B2
Filing date	Aug 9, 2013
Priority date	Dec 1, 2011
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

Orthopedic procedures can involve tools or other instruments that assist a surgeon. The surgical instrument including a cutting instrument configured to shape bone, including an impaction/extraction device, is disclosed. Methods of shaping a bone including the surgical instrument with the cutting instrument including an impaction/extract device are disclosed.

First claim

What is claimed is:

1. A surgical instrument, comprising:
a cutting instrument configured to shape a bone;
a housing having a longitudinal cannula;
a central shaft defining a longitudinal axis and configured to move within the longitudinal cannula relative to the housing, the central shaft having a distal end portion, securable to the cutting instrument, and a proximal end portion defining an extraction surface;
an impaction surface facing proximally and forming a proximal most end of the proximal end portion of the central shaft, whereby impacting the impaction surface applies a proximal to distal force to the central shaft; and
an extraction lever, pivotally connected to the housing, having an extraction lever impaction surface configured to move relative to the central shaft and an extraction arm, opposite the extraction lever impaction surface, configured to contact the extraction surface and apply a distal to proximal force to the central shaft.

2. The surgical instrument of claim 1 , wherein the housing includes a ball detent configured to position the central shaft in a withdrawn position such that the cutting instrument does not extend distally beyond a distal extent of the housing.

3. The surgical instrument of claim 2 , wherein the housing includes:
a transverse bore defining an opening, having a smaller diameter than the ball detent, to the longitudinal cannula, the ball detent positioned at least partially in the transverse bore and at least partially extending into the longitudinal cannula; and
a spring positioned at least partially within the transverse bore and biasing the ball detent toward the longitudinal cannula.

4. The surgical instrument of claim 3 , wherein the central shaft includes a divot configured to receive the ball detent, the ball detent, when positioned at least partially within the divot, inhibits movement of the central shaft relative to the housing.

5. The surgical instrument of claim 1 , wherein the distal end portion of the central shaft includes a central shaft securement feature configured to releasably couple with a cutting instrument securement feature of the cutting instrument.

6. The surgical instrument of claim 5 , wherein the central shaft securement feature includes an internal wall defining a recess and a locating pin configured to move at least partially within the recess.

7. The surgical instrument of claim 6 , wherein the cutting instrument securement feature includes a protrusion, substantially congruent to the recess, configured to be at least partially received within the recess and a divot configured to at least partially receive the locating pin.

8. The surgical instrument of claim 6 , wherein the locating pin includes a proximal protrusion configured to be at least partially received by a securement spring configured to contact a shoulder of the locating pin.

9. The surgical instrument of claim 8 , wherein the locating pin includes a transverse bore configured to receive a button, the button configured to withdraw the protrusion from the recess to decouple the central shaft securement feature from the cutting instrument securement feature.

10. The surgical instrument of claim 1 , further comprising a cylindrical pivot pin received in a pivot aperture, the cylindrical pivot pin moveably connecting the extraction lever to the housing.

11. The surgical instrument of claim 1 , wherein the cutting instrument includes a tibial broach.

12. A surgical instrument system, comprising:
a surgical instrument, including,
a cutting instrument configured to shape a bone;
a housing having a longitudinal cannula and a housing indexing feature;
a central shaft defining a longitudinal axis and configured to move within the longitudinal cannula relative to the housing, the central shaft having a distal end portion, securable to the cutting instrument, and a proximal end portion defining an extraction surface;
an impaction surface facing proximally and forming a proximal most end of the proximal end portion of the central shaft, whereby impacting the impaction surface applies a proximal to distal force to the central shaft; and
an extraction lever, pivotally connected to the housing, having an extraction lever impaction surface configured to move relative to the central shaft and an extraction arm, opposite the extraction lever impaction surface, configured to contact the extraction surface and apply a distal to proximal force to the central shaft; and
a support structure, including,
a support structure indexing feature engageable with the housing indexing feature to index the surgical instrument relative to the support structure.

13. The surgical instrument system of claim 12 , wherein the support structure includes a tibial sizing plate.

14. The surgical instrument system of claim 13 , wherein the cutting instrument includes a tibial broach.

15. The surgical instrument system of claim 12 , wherein the distal end portion of the central shaft includes a central shaft securement feature configured to releasably couple with a cutting instrument securement feature of the cutting instrument.

16. The surgical instrument system of claim 15 , further comprising an actuating button configured to bias a securement spring to decouple the central shaft securement feature and the cutting instrument securement feature.

17. The surgical instrument system of claim 11 , wherein the housing includes at least one magnet positioned to urge the support structure toward the housing as the housing indexing feature is brought into engagement with the support structure indexing feature.

Assignees

• Zimmer Inc

Inventors

• Yoko Tim
• Roach Brian E
• Nangli Vijayraj G

Classifications

• A61B17/1675 Primary

  for the knee · CPC title

• A61B17/92

  Impactors or extractors, e.g. for removing intramedullary devices {(insertion or extraction of artificial joints A61F2/4603)} · CPC title

• A61B2017/922

  Devices for impaction, impact element · CPC title

• A61B17/1604 Primary

  Chisels; Rongeurs; Punches; Stamps · CPC title

• A61B17/1764

  for the knee · CPC title