Elbow prosthesis
AssigneeUniversity of Leeds Industrial Service Ltd.
InventorsAndrew A. Amis, James H. Miller
Life of this patent
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Abstract
An elbow prosthesis having a humeral component having spherical, articular surface portions which together extend over substantially the whole of the length of the component and which are shaped and dimensioned for improved fit with the ulna and radius or with prosthetic components located thereon. The invention also provides a set of instruments suitable for shaping the end of a bone to receive a prosthetic component.
Claims19
An elbow prosthesis comprising a humeral component for fitting over the end of the humerus to provide the entire bearing surface for the humerus by replacing the natural articulating surfaces of the trochlea and capitellum, the component being an elongate member of substantially C-cross section, the inner surface of which is for engagement with the end of the humerus and the outer surface of which is provided with first, second and third spherical surface portions, the first and third spherical surface portions being arranged on either side of the second spherical surface portion and the three spherical surface portions together extending over substantially the whole of the length of the component, the first and second spherical surface portions being for engagement with the ulna or a prosthetic component located thereon and the third spherical surface portion being optionally for engagement with the radius or a prosthetic component located thereon, the diameter of the first spherical surface portion being greater than the diameter of the third spherical surface portion and the ratio of the distance from the lateral end of the humeral component to the position of maximum diameter of the humeral component in the region of the second spherical surface portion to the length of the humeral component being less than 0.5.
Dependencies are inferred from the claim text.