Artificial hip cotyl

Abstract

Abstract The new acetabular cup consists of a metal outer shell (1) and a plastic cup element (4). It has, in a novel combination, a series of features of which at least some are known per se: - the outer shell (1), whose basic shape forms a truncated cone, has a circular fine toothing (5) with a maximum tooth depth of 1 mm; - projecting from the envelope of the truncated cone (1) are at least three spreading dowels (9) extending parallel to the axis of the truncated cone; - the slotted, spreadable height (h) of the dowels (9) is limited to their area projecting beyond the truncated cone (1) and has a toothing (14); - in the area of the truncated cone (1), the outer surface of the dowel has no toothing; - the diameter (d) of an inner circle (10) at a tangent to the dowels (9) amounts to 2/3 of the base-side internal diameter (D) of the inner cavity (11) of the outer shell (1); - the diameter (U) of a circle (12) enclosing the dowels (9) is smaller than the diameter (A) of the base-side edge (13) of the outer shell (1). <??>The new construction is intended to facilitate the work of the surgeon and to improve the fixation of the implant in the pelvic bone, particularly in cases where there is a lack of supporting bone substance. <IMAGE>

Inventors

• 👤 Kurt Karpf

Bibliographic Details