Method and apparatus for trialing and implanting a modular femoral hip

Patent metadata

Field	Value
Publication number	US-9615942-B2
Application number	US-201213716926-A
Country	US
Kind code	B2
Filing date	Dec 17, 2012
Priority date	Mar 5, 2010
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A modular femoral hip implant trialing system. The system generally includes a proximal body, a fastener, and a fastener retention member. The proximal body includes a proximal bore, a tapered distal bore, and a passageway connecting the proximal bore to the distal bore. The proximal bore, the distal bore, and the passageway are aligned along a first axis. The fastener includes a head in the proximal bore and a stem in the distal bore, the fastener is aligned along the first axis. The fastener retention member is positioned in the proximal bore and is operable to retain at least a portion of the fastener within the proximal bore.

First claim

What is claimed is:

1. A modular femoral hip implant trialing system comprising:
a proximal alignment jig portion including a support device operable to support a proximal body having a distal stem mounted thereto, the proximal alignment jig portion including a mounting knob configured to directly engage the proximal body to retain the proximal body relative to the proximal alignment jig portion;
a distal alignment jig portion including an alignment guide configured to be positioned beneath and in direct contact with a distal tip of the distal stem when the mounting knob is engaged with the proximal body, so as to identify a first orientation of the distal stem relative to the proximal body, the orientation identified by relative positions of the distal tip relative to features of the alignment guide, wherein the alignment guide is axially aligned with the support device; and
a support base connecting the proximal alignment jig portion to the distal alignment jig portion.

2. The system of claim 1 , wherein the features of the alignment guide include an alignment grid having a plurality of radial lines emanating from a center point and a plurality of concentric circles surrounding the center point, and wherein the alignment jig includes a plurality of notations along the support base for recording distal stem length.

3. The system of claim 1 , wherein each of the proximal alignment jig portion and the distal alignment jig portion are slidably movable along the support base and locked to the support base with a fastener.

4. The system of claim 1 , wherein the mounting knob includes an engagement shaft extending from the mounting knob and configured to directly engage the proximal body.

5. The system of claim 1 , wherein the support base extends from a first end to a second end, wherein the proximal alignment jig portion is adjustably coupled to the first end of the support base and the distal alignment jig portion is adjustably coupled to the second end of the support base.

6. The system of claim 5 , wherein each of the proximal alignment jig portion and the distal alignment jig portion are slidably movable relative to the first end and the second end of the support base, respectively, along a longitudinal axis of the support base to accommodate different length distal stems.

7. The system of claim 1 , further comprising a pedestal at a first end of the proximal alignment jig portion and an engagement tab at a second end that extends from the proximal alignment jig portion and is operable to engage a recess defined by the proximal body to rotationally lock the proximal body to the proximal alignment jig portion.

8. The system of claim 1 , wherein a first end of the support base is connected to the proximal alignment jig portion between a pedestal at a first end of the proximal alignment jig portion and the support device at a second end;
wherein a second end of the support base is connected to the distal alignment jig portion between a pedestal at a first end of the distal alignment jig portion and the alignment guide at a second end; and
wherein the first end is slidably movable relative to the second end to increase and decrease a distance between the first end and the second end, the first end is operable to be fixed relative to the second end with a fastener.

9. The system of claim 1 , wherein the alignment guide includes an alignment tab pivotally mounted to the distal alignment jig portion, a center portion of the alignment tab is axially aligned with the support device; and
wherein the alignment tab is moved to at least nearly abut the distal stem to record the distal stem's position.

10. A modular femoral hip implant trialing system comprising:
an elongated support base extending from a first end to a second end;
a proximal support portion mounted proximate to the first end of the support base, the proximal support portion including a mounting knob configured to directly engage and retain a proximal body relative to the proximal support portion;
a distal platform mounted proximate to the second end of the support base; and
an alignment indicator at the distal platform, wherein the distal platform is configured to be positioned beneath and in direct contact with a distal tip of a distal stem, such that the alignment indicator is configured to identify an angular orientation of the distal stem relative to the proximal body based on the distal tip, the angular orientation identified by relative positions of the distal tip relative to features of the alignment indicator.

11. The system of claim 10 , wherein the features of the alignment indicator comprise alignment markings positioned on the distal platform and adjacent to the distal stem coupled to the proximal body.

12. The system of claim 11 , wherein the alignment markings include a measuring grid having a center point, radial lines emanating from the center point and concentric circles surrounding the center point.

13. The system of claim 10 , wherein the proximal support portion and the distal platform are adjustably mounted relative to the first and second ends of the support base.

14. The system of claim 13 , wherein the proximal support portion defines a proximal opening configured to adjustably receive the first end of the support base and the distal platform defines a distal opening configured to adjustably receive the second end of the support base.

15. The system of claim 14 , wherein each of the proximal support portion and the distal platform are slidably movable along the support base and locked to the support base with a proximal fastener and a distal fastener, respectively.

16. A modular femoral hip implant trialing system comprising:
an elongated support base extending from a first end to a second end;
a proximal support portion adjustably mounted proximate a first end of the support base and including a mounting knob configured to directly engage and retain a proximal body having a distal stem adjustably mounted thereto; and
a distal platform adjustably mounted proximate the second end of the support base, the distal platform configured to be positioned underneath and in direct contact with a distal tip of the distal stem and including an alignment indicator-configured to identify an angular orientation of the distal stem relative to the proximal body, the angular orientation identified by relative positions of the distal tip relative to features of the alignment indicator.

17. The system of claim 16 , wherein the features of the alignment indicator comprise alignment markings that include a center point having radial lines emanating therefrom and concentric circles surrounding the center point.

18. The system of claim 16 , wherein the proximal body and the distal stem are selected from a trial proximal body and trial distal stem and a proximal body implant and distal stem implant.

Assignees

• Biomet Mfg Llc

Inventors

• Smith Aaron P
• Witt Tyler D

Classifications

• A61F2/468 Primary

  Testing instruments for artificial joints (for testing non-implantable prostheses A61F2/76) · CPC title

• A61F2002/3652

  Connections of necks to shafts · CPC title

• A61F2002/365

  Connections of heads to necks · CPC title

• A61F2002/30616

  Sets comprising a plurality of prosthetic parts of different sizes or orientations · CPC title

• A61F2002/30604

  modular · CPC title