Hinge Knee Assembly Guide

Patent metadata

Field	Value
Publication number	US-2021015621-A1
Application number	US-202016930838-A
Country	US
Kind code	A1
Filing date	Jul 16, 2020
Priority date	Jul 16, 2019
Publication date	Jan 21, 2021
Grant date	—

Abstract

A total knee prosthesis system that includes a guide having first and second wedges each having a thickness configured to be located between the tibial and femoral component. When the first and second wedges are located between the tibial and femoral component, the first and second wedges align the first axle opening of the tibial component with the second axle opening of the femoral component for receipt of an axle. The guide includes a guide recess extending between the first and second wedges and a post extending into the guide recess. The guide also includes a bridge connected to and extending between the first and second wedges such that the bridge at least partially defines the guide recess.

First claim

1 . A total knee prosthesis system, comprising:
an axle; a tibial component having a baseplate portion, an articular portion connected to the baseplate portion, and a protruding portion extending from the baseplate and articular portions, the protruding portion having a first axle opening for receipt of the axle; a femoral component having a distal surface and a second axle opening for receipt of the axle; and a guide having first and second wedges each having a thickness configured to be located between the tibial component and the femoral component such that, when the first and second wedges are located between the tibial component and the femoral component, the first and second wedges align the first axle opening with the second axle opening for receipt of the axle therein.

2 . The system of claim 1 , wherein the guide includes a post extending therefrom and the protruding portion includes a post opening, the post opening of the tibial component being configured to receive the post.

3 . The system of claim 1 , wherein, when the guide is located between the tibial component and the femoral component, a distal end surface of the guide engages with the tibial component.

4 . The system of claim 1 , wherein the first and second wedges each have a curved proximal surface.

5 . The system of claim 2 , wherein the distal surface of the femoral component has a plurality of portions each defined by a different radius of curvature, and the curved proximal surface of each of the first and second wedges having a radius of curvature matching the radius of curvature of a first of the plurality of portions of the distal surface of the femoral component.

6 . The system of claim 1 , wherein the guide has a fully seated position when located between the tibial and femoral components and the guide can only achieve the fully seated position at one angle of flexion.

7 . (canceled)

8 . A total knee prosthesis system, comprising:
a femoral component having first and second condylar portions each defining a convex distal surface, the first and second condylar portions further defining an intercondylar recess therebetween and a first axle opening extending therethrough, the axle opening being in communication with the intercondylar recess; a tibial component defining a concave proximal surface; an axle; a coupling component coupled to the tibial component and having a head portion extending from the tibial component, the head portion defining a second axle opening; and an assembly guide having an upper surface, a lower surface, and a thickness therebetween, wherein, when the head portion is received within the recess and the assembly guide is interposed between the tibial component and femoral component, the thickness of the assembly guide positions the femoral component such that the first axle opening coaxially aligns with the second axle opening so that the axle can be inserted into the first and second axle openings.

9 . The system of claim 8 , wherein the tibial component includes a baseplate member and a polymer insert, the polymer insert defining the concave proximal surface.

10 . The system of claim 8 , wherein the assembly guide includes first and second guide portions and a guide recess extending therebetween, the guide recess being configured to receive the head portion of the coupling component.

11 . The system of claim 10 , wherein the assembly guide includes a bridge connected to and extending between the first and second guide portions, the bridge at least partially defining the guide recess.

12 . The system of claim 11 , wherein:
the assembly guide includes a post extending from bridge and into the guide recess, and the head portion defines a post opening configured to receive the post.

12 . (canceled)

13 . The system of claim 1221 , wherein the first concave portion has a radius of curvature equal to a radius of curvature of the convex distal surface of the first condylar portion.

14 . The system of claim 1221 , wherein the distal surface of the first condylar portion has an anterior section and a posterior section, the anterior section having a first radius of curvature, the posterior section having a second radius of curvature, the first and second radii of curvature being different.

15 . The system of claim 14 , wherein the first concave portion of the assembly guide has a third radius of curvature equal to the second radius of curvature.

16 . A method of assembling a hinge knee prosthesis, comprising:
positioning a head portion of a coupling component extending from a tibial component into an intercondylar recess of a femoral component; inserting an alignment member between the tibial component and femoral component so that the alignment member positions the femoral component relative to the head portion such that the first axle opening of the femoral component aligns with a second axle opening of the coupling component; inserting an axle into the first and second axle openings so as to hingedly connect the femoral component with the coupling component; and after inserting the axle, removing the coupling component from between the tibial component and the femoral component.

17 . The method of claim 16 , wherein the positioning step includes wedging the coupling component between the tibial component and femoral component so that an upper surface of the coupling component supports the femoral component and a thickness thereof aligns the first and second axle openings.

18 . The method of claim 16 , further comprising:
connecting a polymer insert to a baseplate of the tibial component, the polymer insert having a concave proximal surface; and inserting a bearing of the coupling component into an opening in the baseplate.

19 . The method of claim 18 , wherein the connecting step is performed prior to inserting the alignment member between the tibial component and femoral component.

20 . The method of claim 16 , wherein inserting the alignment member between the tibial component and femoral component includes:
inserting a post of the alignment member into a post opening of the head portion; and contacting first and second condylar portions with respective first and second first alignment portions of the alignment member.

21 . The system of claim 11 , wherein the upper surface of the assembly guide includes a first concave portion on the first guide portion and a second concave portion on the second guide portion.

Assignees

• Howmedica Osteonics Corp

Inventors

• Servidio Damon J

Classifications

• A61F2/385

  also provided with condylar bearing surfaces · CPC title

• A61F2/389

  Tibial components (A61F2/3868 takes precedence) · CPC title

• A61F2/384

  hinged, i.e. with transverse axle restricting the movement · CPC title

• A61F2/3859 Primary

  Femoral components · CPC title

• A61F2002/30112

  Rounded shapes, e.g. with rounded corners · CPC title