Connecting sleeve for anchoring shafts of two oppositely arranged prostheses

Patent metadata

Field	Value
Publication number	US-11357630-B2
Application number	US-201816497728-A
Country	US
Kind code	B2
Filing date	Mar 29, 2018
Priority date	Mar 31, 2017
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

Abstract

The invention relates to a connecting sleeve for anchoring shafts of two oppositely arranged prostheses, preferably on an elongate bone such as a femur or humerus. The reinforcing sleeve comprises two receiving bushes (1, 2) for one prosthesis shaft each and comprises a separable coupling region (3) arranged therebetween for connection in such a manner as to resist shear forces and rotation. According to the invention, each receiving bush (1, 2) has, on the side thereof facing the coupling region, one fork (31, 32) of a pair of forks that interact with each other, and a fitting block (4) is arranged on a base of the fork, the lateral surfaces (44) of which fitting block have a distance that corresponds to an inner width of the fork, and the lateral surfaces (44) are designed to contact flanks of the fork in a planar manner, at least one fastening screw (5) being arranged transversely through the fork. The fork connection is simpler to produce than the known wedge connection and yet is sufficiently robust. Unlike in the case of the wedge connection, an exact fit is not required; a clearance fit between the fork (31, 32) and the fitting block (4) is sufficient in principle, excessive play being eliminated by means of the fastening screw (5).

First claim

The invention claimed is:

1. A connecting sleeve for anchoring shafts of two oppositely arranged prostheses on an elongate bone, comprising a first receiving bush configured for receiving a shaft of one of the prosthesis at one end of the connecting sleeve and a second receiving bush configured for receiving a shaft of the other prosthesis at an opposite end of the connecting sleeve, and a separable coupling region that is arranged between said first receiving bush and said second receiving bush and is connectable in such a way as to resist shear and rotation, wherein: the receiving bushes, at their side directed toward the coupling region, each have a fork that interact with each other, wherein each fork comprises fork tines and a fork base, flanks of the forks being inward facing surfaces of each fork tine; and a fitting block is arranged at the base of each fork between the fork tines of each fork, the lateral sides of each either fitting block are at a distance from each other corresponding to an inner width of the interacting forks, and wherein in a mounted state the flanks of either fork of the interacting forks are bearing in a planar manner on lateral sides of the fitting block of the other fork of the interacting forks, and wherein at least one fastening screw is arranged transversely through each fork, wherein, in each fitting block, a receiving bore for the fastening screw is provided transversely with respect to the direction of extent of each fork, and the lateral sides of each fitting block are inclined toward each other, with the smaller spacing in the direction of the fork tines of the respective fork comprising each fitting block, wherein the fork flanks are inclined in a complementary manner, and the distance from a receiving opening in at least one of the forks to the respective fork base is greater than the distance from the receiving bore in the fitting block to said respective fork base.

2. The connecting sleeve as claimed in claim 1 , wherein the lateral sides of each of the fitting blocks are designed as fitting surfaces complementing the fork flanks.

3. The connecting sleeve as claimed in claim 2 , wherein the distance between the lateral sides corresponds to the distance between the fork tines.

4. The connecting sleeve as claimed in claim 2 , wherein the receiving bore on each fitting block forms a clearance fit with the fastening screw.

5. The connecting sleeve as claimed in claim 1 , wherein either of the forks of the two receiving bushes are configured symmetrically to each other, and the fitting blocks of the two receiving bushes are configured symmetrically to each other.

6. The connecting sleeve as claimed in claim 1 , wherein the width of at least one of the forks is of a greater dimension than the width of the prosthesis shaft that is to be received.

7. The connecting sleeve as claimed in claim 1 , wherein the width in the coupling region is greater than the width in the region of the receiving bushes, but greater by no more than a quarter.

8. The connecting sleeve as claimed in claim 7 , wherein the width in the coupling region is greater than the width in the region of the receiving bushes, but greater by no more than a tenth.

9. The connecting sleeve as claimed in claim 1 , wherein, with respect to at least one of the receiving bushes, the fork and the fitting block arranged at the fork base of said fork are configured in one piece.

10. The connecting sleeve as claimed in claim 1 , wherein each fork is provided with its own fastening screw.

Assignees

• Link Waldemar Gmbh Co

Inventors

• Link Helmut D
• Borchers Udo

Classifications

• A61F2/28 Primary

  Bones · CPC title

• A61F2/30721

  Accessories · CPC title

• A61F2002/30331

  made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit · CPC title

• A61F2002/2853

  Humerus · CPC title

• A61F2002/30329

  Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements · CPC title