Modular total elbow prosthesis, humeral component and associated kit

Abstract

An ulnar assembly for use with a humeral component to form an elbow prosthesis is provided. The ulnar assembly includes a first component including a portion thereof defining a stem for implantation in a cavity formed in the ulna. The first component defines a longitudinal axis thereof generally coincident with the longitudinal axis of the ulna. The ulnar assembly also includes a second component attached to the first component. The second component is attachable and removable from the first component along the longitudinal axis of the first component. One of the first component and the second component include an external taper. The other of the first component and the second component defines an internal taper therein adapted to receive the external taper.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This Application is a Utility Application based upon U.S. Provisional Patent Application Ser. No. 60 / 623,372 filed Oct. 29, 2004, entitled “MODULAR TOTAL ELBOW PROSTHESIS & INSTRUMENTS AND ASSOCIATED METHOD and upon U.S. Provisional Patent Application Ser. No. 60 / 623,195 filed Oct. 29, 2004, entitled “MOBILE BEARING TOTAL ELBOW PROSTHESIS & INSTRUMENTS AND ASSOCIATED METHOD”. Cross reference is made to the following applications: U.S. Provisional Patent Application Ser. No. 60 / 623,372 filed Oct. 29, 2004, entitled “MODULAR ELBOW PROSTHESIS & INSTRUMENTS AND ASSOCIATED METHOD”, U.S. Provisional Patent Application Ser. No. 60 / 623,195 filed Oct. 29, 2004, entitled “MOBILE BEARING TOTAL ELBOW PROSTHESIS & INSTRUMENTS AND ASSOCIATED METHOD”, as well as DEP645USNP entitled “MODULAR TOTAL ELBOW PROSTHESIS, INSTRUMENTS AND ASSOCIATED METHOD”, DEP645USNP2 entitled “MODULAR TOTAL ELBOW HUMERAL COMPONENT AND ASSOCIATED METHODS”, DEP0645USNP3 entitle...

AI Technical Summary

Benefits of technology

[0020]The present invention provides for an elbow prosthesis that may be more easily removed from the patient and may be more easily repaired or revised when components in the prosthesis may warrant such a procedure. The present invention provides for an enhancement of the pin axis by modifying the modular features of the prosthesis so that the junction is further proximal in the humeral component. A set of stem components of the prosthesis are designed to fit patients anatomically. Such stems are adapted for indications that would be available to fit with several types of articulating components.

Problems solved by technology

The joints in the body are stressed or can be damaged in a variety of ways.

Over time, the normal use of a joint may wear down the cartilage and bring the moving bones in a direct contact with each other.

In contrast, in normal use, a trauma to a joint, such as the delivery of a large force, from an accident for, example, an automobile accident, may cause considerable damage to the bones, the cartilage or to other connective tissue such as tendons or ligaments.

A surgeon may not always know prior to beginning an operation whether a patient would be better served by a semi-constrained or unconstrained elbow prosthesis.

Such patients have joints with surfaces that are arthritic and painful.

The inflammatory disease results in the patient having weaker soft tissue and significant bone erosion.

The weaker soft tissue and bone erosion makes the use of an unconstrained elbow more difficult in that the soft tissues are not of sufficient strength to properly contain the prosthetic components in contact with each other.

This need for a different prosthesis may create a significant issue for the patient.

The removal of particularly the stem portions of the prosthesis after being implanted for some time is difficult.

The current Acclaim Elbow™, as well as other competitive elbow prosthesis, have a shape and configuration that may not be ideally suited to each particular patient's anatomy in that a patient, depending on gender and size, may have a bone structure that is not well suited to available implants.

Current elbow prosthesis have configurations that provide for complicated components for which the cost of manufacturing may be quite high.

Such removal of bone to permit the removal of a prosthesis may severely weaken the supracondylar regions of the humerus.

Such bone removal may weaken the support structure for the prosthesis and may lead to earlier failure.

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