Back to results
US 2016/0089242 A1Published application
Revision hip implants and prosthesis systems
AssigneeSmith & Nephew, Inc.
InventorSteven H. Weeden
Life of this patent
Estimating the term…
Abstract
Revision hip implants and prosthesis systems include femoral heads, cups, screws, bridges, and segmental prostheses for revision surgeries.
Claims8
-8. (canceled)
A modular segmental prosthesis system for supporting an acetabular cup, comprising:
- an inner surface and an outer surface, the inner surface configured to interface with the pelvic bone of the patient, the outer surface facing away from the pelvic bone of the patient, a side of the system extending between the inner and outer surfaces, the side forming a cement fixation area configured to interface with the acetabular cup, the system including a plurality of screw holes extending from the outer surface to the inner surface, the screw holes having a first diameter at the inner surface and a second diameter at the outer surface, the second diameter being greater than the first diameter, the plurality of screw holes having threaded inner surfaces;
- and
- a first screw having a shaft and a head, the shaft of the first screw having a third diameter less than the first diameter of the screw hole, the head having a fourth diameter greater than the first diameter of the screw hole, the shaft of the first screw having threads configured to engage the pelvic bone structure, the head of the first screw having threads formed thereon and configured to engage the threaded inner surfaces of the screws holes.
A method of performing a revision surgery, comprising:
- introducing a modular segmental prosthesis into a patient, the prosthesis comprising an inner surface and an outer surface, the inner surface configured to interface with a pelvic bone of the patient, the outer surface facing away from the pelvic bone of the patient, a side of the prosthesis extending between the inner and outer surfaces, the side forming a cement fixation area configured to interface with an acetabular cup, the system including a plurality of screw holes formed from the outer surface to the inner surface, the screw holes having a first diameter at the inner surface and a second diameter at the outer surface, the second diameter being greater than the first diameter, the plurality of screw holes having threaded inner surfaces;
- and
- introducing a first screw having a shaft and a head, the shaft of the first screw having a third diameter less than the first diameter of the screw hole, the head of the first screw having a fourth diameter greater than the first diameter of the screw hole, the shaft of the first screw having threads configured to engage the pelvic bone structure, the head of the first screw having threads formed thereon and configured to engage the threaded inner surfaces of the screws holes;
- and
- driving one of the screws into the pelvic bone until the threads on the head engage the threaded inner surface of one of the screw holes such that the prosthesis is secured onto the pelvic bone.
2 more elements
A hard bearing liner for an acetabular cup having a socket with an inner radius, the liner being introducible in a revision surgery, comprising:
- a liner having an inner surface and an outer surface, the liner being sized and shaped for insertion into the inner radius of the acetabular cup, the inner surface being arranged to interface directly with a femoral ball of a prosthetic implant, the outer surface being configured to face the inner radius of the acetabular cup;
- and
- surface features formed on the outer surface of the liner and protruding from the outer surface, the surface features being configured to provide gaps therebetween for accommodating cement, the surface features forming an outer radius substantially matching the inner radius of the socket of the acetabular cup.
Dependencies are inferred from the claim text.