Patent ID: 8377142
Filing Date: 2013-02-19
Classification: A61F

Abstract:
1. A distal component for an interphalangeal prosthesis suitable for insertion into a proximal end of a distal phalangeal bone, said component comprising: a stem portion shaped to be received within a surgically prepared bore in the proximal end of the distal phalangeal bone, said stem portion generally tapering inwardly from a proximal to a distal end and having a central longitudinal axis extending from the distal end to the proximal end, said stem portion additionally comprising a head supporting surface formed as a single piece with said stem portion, the underside of said head supporting surface bearing on the distal phalangeal bone into which the stem is implanted and extending from the stem portion and being ramped away therefrom at an angle of greater than 90° to the longitudinal axis of the shaft; and a head portion having an under-surface and an upper-surface, the under-surface of which in use will face the distal phalangeal bone into which the stem is implanted, said head portion extending from the stem portion and being ramped away therefrom at an angle of greater than 90° to the longitudinal axis of the shaft; said upper-surface comprising an articulating surface shaped to enable a cooperating surface on a distal end of a proximal phalangeal bone to articulate there-against as a hinge joint, the head portion having a bore therein; wherein the stem portion in use supports a separate upper section of the head portion, wherein the stem portion includes a stalk extending from and surrounded by the head supporting surface and including a barb to assist in interlocking in the bore, the bore and barb of the stalk being constructed for snap-fit, locking interengagement upon reception of the stalk and barb in the bore to connect the head portion and the stem portion.