Elbow replacement apparatus and methods

Patent metadata

Field	Value
Publication number	US-10195038-B2
Application number	US-201615174533-A
Country	US
Kind code	B2
Filing date	Jun 6, 2016
Priority date	Nov 16, 2009
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

Apparatus and methods for total elbow replacement are provided to allow a surgeon to intraoperatively select a linked or unlinked constraint by utilizing a connection located on the body of the ulnar and/or humeral stem. Additional modularity also allows the selection of a cemented or cementless stem as described herein. The modularity and adjustability provides a number of advantages.

First claim

What is claimed is:

1. A convertible elbow prosthesis comprising:
a humeral component ( 119 ) comprising a humeral stem ( 101 ) and a humeral condyle body ( 102 ), the humeral condyle body ( 102 ) comprising two distally extending condyle portions ( 118 ) each having a condylar bearing surface ( 121 ), a bushing hole ( 117 ) extending through the condyle portion ( 118 ), and a humeral bushing ( 103 ) retained inside the bushing hole ( 117 ) by mechanical interference, the humeral bushings ( 103 ) configured to receive a hinging axle ( 106 ) along a hinging axis ( 112 );
an ulnar component ( 104 ) comprising an ulnar stem ( 110 ), an ulnar body ( 107 ), and an ulnar bearing ( 105 ) detachably coupled to the ulnar body ( 107 ), the ulnar body ( 107 ) comprising a central fin ( 137 ) provided with an ulnar coupling hole ( 143 ), the ulnar bearing ( 105 ) comprising a central covering fin ( 130 ) provided with an ulnar hinging hole ( 145 ) and provided, on opposite sides of the central covering fin ( 130 ), with two respective articulation housings ( 139 ) defining complementary bearing surfaces that receive and articulate with the condylar bearing surfaces ( 121 ) of the humeral condyle portions ( 118 ); and
a hinging axle ( 106 ) comprising a barrel-shaped end portion ( 153 ), an opposite barrel-shaped end portion ( 155 ), and a mid-portion ( 106 a ) therebetween;
wherein the condyle portions ( 118 ) and the ulnar bearing ( 105 ) are configured for reciprocal articulation about the hinging axis ( 112 ) in an articulation condition;
wherein the central covering fin ( 137 ) of the ulnar bearing ( 105 ) comprises a coupling slot ( 141 ) configured to receive the central fin ( 137 ) of the ulnar body ( 107 );
wherein the ulnar coupling hole ( 143 ) is aligned with the ulnar hinging hole ( 145 ) along said hinging axis ( 112 ) when the ulnar bearing ( 105 ) is coupled to the ulnar body ( 107 );
wherein the ulnar coupling hole ( 143 ) and the ulnar hinging hole ( 145 ) are further aligned with said humeral bushings ( 103 ) along said hinging axis ( 112 ) in said articulation condition,
wherein the hinging axle ( 106 ) passes through the humeral bushings ( 103 ), through the ulnar hinging hole ( 145 ), and through the ulnar coupling hole ( 143 ), and wherein the mid-portion ( 106 a ) of the hinging axle ( 106 ) is fixedly attachable to said ulnar coupling hole ( 143 );
wherein each of the humeral condyle portions ( 118 ) comprises an inner articulation annular wall ( 115 ) defining a central face ( 116 ) of the respective humeral condyle portion ( 118 ),
the central faces ( 116 ) articulating with lateral surfaces ( 131 ) of the central covering fin ( 130 ) of the ulnar bearing ( 105 );
wherein said bushing holes ( 117 ) are delimited, on the inner side of the condyle portions ( 118 ), by the articulation annular walls ( 115 ).

2. The elbow prosthesis of claim 1 , wherein the humeral bushings ( 103 ) of the two distally extending condyle portions ( 118 ) and the bushing holes ( 117 ) of the condyle portions ( 118 ) are provided with mating male and female cylindrical portions for reciprocal mechanical connection with interference.

3. The elbow prosthesis of claim 1 , wherein the condyle portions ( 118 ), the hinging axle ( 106 ) and the ulnar body ( 107 ) are made of metal.

4. The elbow prosthesis of claim 1 , wherein the humeral bushings ( 103 ) of the two distally extending condyle portions ( 118 ) and the ulnar bearing ( 105 ) are made of low friction material.

5. The elbow prosthesis of claim 1 , wherein the ulnar body ( 107 ) is connected to the ulnar bearing ( 105 ) by mechanical connection.

6. The elbow prosthesis of claim 1 , wherein the ulnar coupling hole ( 143 ) comprises a threaded and tapered, or conical shaped, portion ( 143 a ), and wherein the threaded and tapered, or conical shaped portion ( 143 a ) of the ulnar coupling hole ( 143 ) comprises a inner threaded surface ( 147 ) and a taper connection surface ( 149 ), and wherein the mid-portion ( 106 a ) of the hinging axle ( 106 ) is a threaded and tapered, or conical shaped, mid-portion ( 106 a ), and wherein the threaded and tapered, or conical shaped, mid-portion ( 106 a ) of the hinging axle ( 106 ) comprises a mating threaded surface ( 151 ) and a tapered surface ( 152 ) configured to screw fit respectively with the inner threaded surface ( 147 ) and the taper connection surface ( 149 ) of the threaded and tapered, or conical shaped portion ( 143 a ) of the ulnar coupling hole ( 143 ).

7. The elbow prosthesis of claim 1 , wherein the ulnar body ( 107 ) comprises one or more protruding attachment ridge ( 148 ) and the ulnar bearing ( 105 ) comprises one or more mating slots ( 150 ) configured for engaging with a respective said attachment ridge ( 148 ).

8. The elbow prosthesis of claim 1 , wherein the mid-portion ( 106 a ) of hinging axle ( 106 ) is a threaded and tapered, or conical shaped, mid-portion, and wherein said ulnar coupling hole ( 143 ) is provided with a threaded and tapered, or conical shaped, portion ( 143 a ) mating with said threaded and tapered, or conical shaped, mid-portion ( 106 a ) of said hinging axle ( 106 ).

Assignees

• Limacorporate Spa
• New York Soc Ruptured & Crippled Maintaining Hospital For Special Surgery

Inventors

• Pressacco Michele
• Del Negro Nicola
• Fattori Andrea
• Hotchkiss Robert N
• Figgie Mark P
• Wright Timothy M
• Lipman Joseph D
• Lo Darrick

Classifications

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• A61F2/3804 Primary

  for elbows · CPC title

• A61F2/384

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

• A61F2002/30286

  barrel-shaped · CPC title