Carl R Jacobs

US Patent:

50806742, Jan 14, 1992

Filed:

Sep 20, 1990

Appl. No.:

7/587489

Inventors:

Carl H. Jacobs - South Bend IN
H. Ravindranath Shetty - Warsaw IN

Assignee:

Zimmer, Inc. - Warsaw IN

International Classification:

A61F 238

US Classification:

623 20

Abstract:

A prosthetic implant including a base portion and an additional portion which is to be securely attached to the base portion. The additional portion includes at least one post extending therefrom which is adapted to be readily received in a corresponding reverse tapered hole in the base portion. The post is adapted to be mechanically spread out to cause at least a portion of the post to become wider than the opening of the hole, thus resisting subsequent separation of the post from the hole. This secures the additional portion to the base portion of the implant. The post may be a stud-type extension integrally formed with or secured to the additional portion, or the post may be a separate member which is received in a post hole in the additional portion such that the post portion of the separate member extends from the additional portion. The post may be solid or may have a channel therethrough. The additional portion may include a substrate with a porous surface bonded or secured thereto.