Hip Stem Alignment Guide

Patent metadata

Field	Value
Publication number	US-2023277334-A1
Application number	US-202318173139-A
Country	US
Kind code	A1
Filing date	Feb 23, 2023
Priority date	Mar 2, 2022
Publication date	Sep 7, 2023
Grant date	—

Abstract

A prosthesis alignment guide includes a guide body that has an opening that extends at least partially therein and a first alignment hole extending entirely therethrough. The opening is configured to receive a trunnion of a joint prosthesis for mounting the guide body to the joint prosthesis. An alignment member is disposed within the first alignment hole and is axially moveable therein. A locking member is engaged to the guide body and moveable from a first position in which the locking member is disengaged from the alignment member and a second position in which the locking member engages the alignment member and secures it from axial movement within the first alignment hole.

First claim

1 . A prosthesis alignment guide, comprising:
a guide body having an opening extending at least partially therein and a first alignment hole extending entirely therethrough, the opening being configured to receive a trunnion of joint prosthesis for mounting the guide body to the joint prosthesis; an alignment member disposed within the first alignment hole and being axially moveable therein; a locking member engaged to the guide body and moveable from a first position in which the locking member is disengaged from the alignment member and a second position in which the locking member engages the alignment member and secures it from axial movement within the first alignment hole.

2 . The guide of claim 1 , wherein the guide body has a spherical portion defining a spherical exterior surface of the guide body.

3 . The guide of claim 1 , wherein the opening of the guide body defines a first axis, and the first alignment hole defines a second axis, the first and second axes intersecting at an oblique angle in a projected plane.

4 . The guide of claim 1 , wherein the first alignment hole is one of a first set of alignment holes each lying in a first plane.

5 . The guide of claim 4 , wherein the guide body includes a second set of alignment holes each lying in a second plane offset from the first plane.

6 . The guide of claim 4 , wherein the guide body includes a threaded opening extending therein an intersecting each of the first set of alignment holes, and the locking member includes a threaded shaft engaged to the threaded opening and moveable therein.

7 . The guide of claim 1 , wherein the locking member includes a head and a threaded shaft extending from the head, the threaded shaft threadedly engaged to the guide body.

8 . The guide of claim 7 , wherein the alignment member is a headless pin.

9 . A prosthesis system, comprising:
a trial prosthesis having a stem and a neck; a joint prosthesis having a stem and a neck; and a prosthesis alignment guide having a guide body, an alignment member, and a locking member, the guide body connectable to the respective necks of the trial prosthesis and joint prosthesis and having an alignment hole extending therethrough, the alignment member being slidable disposed within the alignment hole so that a first end thereof extends from the guide body, and the locking member being engaged to the guide body and moveable from a first position in which the locking member is disengaged from the alignment member and a second position in which the locking member engages the alignment member and secures it from slidable movement within the alignment hole.

10 . The guide of claim 9 , wherein the stem of the trial prosthesis includes a plurality of broaching teeth.

11 . The guide of claim 10 , wherein the neck is a modular neck connectable to the stem.

12 . The guide of claim 9 , wherein the guide body includes a threaded opening extending therein and intersecting the alignment hole.

13 . The guide of claim 12 , wherein the locking member includes a head and a threaded shaft extending from the head, the threaded shaft configured to threadedly engage the threaded opening.

14 . The guide of claim 13 , wherein the alignment member is a headless pin having a pointed tip.

15 . The guide of claim 14 , wherein the respective necks of the trial prosthesis and joint prosthesis each have a trunnion, and the guide body includes a tapered opening configured to respectively receive the trunnions of the trial prosthesis and joint prosthesis.

16 . The guide of claim 15 , wherein the respective stems of the trial prosthesis and joint prosthesis each define a stem axis, and the alignment hole defines an axis perpendicular to the stem axis of each of the trial prosthesis and joint prosthesis when the guide body is mounted thereto.

17 . The guide of claim 15 , wherein the tapered opening defines an axis, and the axis of the alignment hole lies in a plane offset from the axis of the tapered opening.

18 . The guide of claim 17 , wherein the alignment hole is one of a plurality of alignment holes lying in the plane offset from the axis of the tapered opening.

19 . A method for aligning a hip prosthesis relative to a femur, comprising:
inserting a prosthesis trial into a femur; pointing to a target location with an alignment member of an alignment guide mounted to a trunnion of the prosthesis trial; transferring the alignment guide to a trunnion of a joint prosthesis; inserting the joint prosthesis into the femur; and adjusting the position and orientation of the joint prosthesis within the femur until the alignment member of the alignment guide points to the target location.

20 . The method of claim 19 , further comprising marking the femur at the target location after the pointing step, and the adjusting step includes pointing the alignment guide at the marking.

Assignees

• Howmedica Osteonics Corp

Inventors

• Canepa Polina
• David Katrina
• Heffernan Christopher
• Gibbons Rachel
• Haddad Fares
• Masini Michael

Classifications

• A61F2/4684 Primary

  Trial or dummy prostheses · CPC title

• A61F2002/4687

  Mechanical guides for implantation instruments · CPC title

• A61F2/4607 Primary

  of hip femoral endoprostheses · CPC title

• A61F2002/4677

  using a guide wire · CPC title

• A61F2002/4631

  the prosthesis being specially adapted for being cemented · CPC title