Hip joint prosthesis
AssigneeSulzer Brothers Limited
InventorsHeinz Wagner, Roland Willi
Life of this patent
Estimating the term…
Abstract
The hip joint prosthesis consists of two cups which are anchored together in the direction of the polar axes by a snap connection. The inner cup is made of cobalt alloy and outer cup of titanium. The outer cup carries a straddling dowel which projects into the bone tissue and which is subdivided into radially deflectable segments having sharp edges thereon. The inner cup has a shaped body which projects into the dowel and which is shaped so as to expand the deflectable segments upon rotation of the inner cup within the outer cup. Each dowel segment is provided with a notch to receive a corner of the shaped body so as to hold the body in a holding position in a snap-fit manner.
Claims14
A hip joint prosthesis comprising
- an outer cup of titanium having an outwardly extending dowel disposed on a polar axis of said cup, said dowel being sub-divided into a plurality of radially deflectable segments;
- and
- an inner cup of cobalt alloy rotatably mounted within said outer cup and having a shaped body extending on said axis into said dowel and within said segments, said body being shaped to radially expand said segments in response to rotation of said body within said dowel from a rest position to a holding position.
A hip joint prosthesis comprising
- an outer cup having an outwardly extending dowel disposed on a polar axis of said cup, said dowel being sub-divided into a plurality of radially deflectable segments;
- and
- an inner cup rotatably mounted within said outer cup and having a shaped body extending on said axis into said dowel and within said segments, said body being shaped to radially expand said segments in response to rotation of said body within said dowel from a rest position to a holding position.
A hip joint prosthesis comprising
- an outer cup having an outwardly extending dowel disposed on a polar axis of said cup, said dowel being sub-divided into a plurality of radially deflectable segments, each segment having outwardly directed teeth thereon;
- and
- an inner cup rotatably mounted within said outer cup and having a polygonal shaped body extending on said axis into said dowel and within said segments, said body being shaped to radially expand said segments in response to rotation of said body within said dowel from a rest position to a holding position.
Dependencies are inferred from the claim text.