Allen M Levine

US Patent:

57829306, Jul 21, 1998

Filed:

Feb 13, 1996

Appl. No.:

8/600660

Inventors:

Ruey Y. Lin - New City NY
Ashok K. Chopra - Morris Plains NJ
Allen P. Levine - Brooklyn NY
Bernard Silverstein - North Bergen NJ

Assignee:

Hommedica Inc. - New York NY

International Classification:

A61F 234
A61F 232

US Classification:

623 23

Abstract:

A prosthetic acetabular cup assembly, for receiving a ball attached to a femur, including components interlocked via a locking mechanism that includes a retaining ring fabricated at least in part using a polyaryletherketone material, such as PEEK. The locking mechanism is designed to meet predefined constraints such as assuring that substantially all motion is eliminated between assembled parts, assuring further that push-in/pull-out forces of assembly are within generally accepted industry standards, etc. Further aspect of the invention are directed to (a) the form and composition of the locking mechanism per se, such as locking mechanisms including a retaining ring fabricated at least in part using a polyaryletherketone material, where the shape of the retaining ring and manner in which it cooperates with the other components in the cup assembly results in a locking mechanism that satisfies the aforementioned constraints; (b) processes for fabricating specific types of retaining rings for use in securing the components of an acetabular cup assembly; and (c) to locking rings per se made utilizing polyaryletherketone material and composites including a polyaryletherketone material.

US Patent:

59648090, Oct 12, 1999

Filed:

Aug 6, 1997

Appl. No.:

8/907147

Inventors:

Ruey Y. Lin - New City NY
Ashok K. Chopra - Morris Plains NJ
Allen P. Levine - Brooklyn NY
Bernard Silverstein - North Bergen NJ

Assignee:

Howmedica Inc. - New York NY

International Classification:

A61F 234

US Classification:

623 22

Abstract:

A prosthetic acetabular cup assembly, for receiving a ball attached to a femur, including components interlocked via a locking mechanism that includes a retaining ring fabricated at least in part using a polyaryletherketone material, such as PEEK. The locking mechanism is designed to meet predefined constraints such as assuring that substantially all motion is eliminated between assembled parts, assuring further that push-in/pull-out forces of assembly are within generally accepted industry standards, etc. Further aspect of the invention are directed to (a) the form and composition of the locking mechanism per se, such as locking mechanisms including a retaining ring fabricated at least in part using a polyaryletherketone material, where the shape of the retaining ring and manner in which it cooperates with the other components in the cup assembly results in a locking mechanism that satisfies the aforementioned constraints; (b) processes for fabricating specific types of retaining rings for use in securing the components of an acetabular cup assembly; and (c) to locking rings per se made utilizing polyaryletherketone material and composites including a polyaryletherketone material.