Endoprosthetic bone joint

Details Endoprosthetic bone joint Endoprosthetic bone joint

1976-12-06

1978-08-15

Frinks, Ronald L.

Surgery

Truss

Pad

128 92C, A61F 124

Patent

active

041061284

ABSTRACT:
A prosthetic joint of the type used to replace dysfunctional non-weight bearing joints such as the knuckle, wrist, elbow or shoulder. The preferred embodiment comprises a radial component connected by a concavo-convex socket component to a metacarpal component. The radial component has an intramedullary stem terminating in a cup having a plurality of inwardly extending pins. The concavo-convex socket component is retained in the cup by the articulation of the pins with a plurality of flats which communicate with slots which terminate in apertures. The concavo-convex component includes an opening extending inwardly from one end thereof which defines two communicating bearing surfaces, with the innermost surface being spherical and the outer surface being frusto-conical and having an elliptical cross-section. The metacarpal component includes a ball, a neck area and an intramedullary stem. The ball articulates with the spherical surface of the concavo-convex member component and the neck, which also has an elliptical cross-section, articulates with the frusto-conical surface. The intramedullary stem which is connected to the cup is offset volarly by an amount equal to the offset in the metacarpal component thereby providing a greater moment arm for the weaker tendons of the wrist.

REFERENCES:
patent: 3506982 (1970-04-01), Steffee
patent: 3795922 (1974-03-01), Herbert et al.
patent: 3837008 (1974-09-01), Bahler et al.
patent: 3868730 (1975-03-01), Kaufer et al.
patent: 4003096 (1977-01-01), Frey

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