Stepped-lock ring system for implantable joint prostheses

Details Stepped-lock ring system for implantable joint prostheses Stepped-lock ring system for implantable joint prostheses

1989-04-24

1990-06-26

Isabella, David J.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

Bone

623 18, A61F 234, A61F 230

Patent

active

049368559

ABSTRACT:
A prosthetic implant for use in replacing the ball end of a biological joint includes a cup member for insertion into the natural socket, an insert received in the cup member defining a ball receiving cavity with a stepped entry, and a split locking ring received in the stepped entry. A ball shaped portion of a prosthesis introduced into the entry will displace the locking ring inwardly to a larger stepped portion of the entry where the locking ring can expand to allow passage of the ball after which the ring contracts and slides over the ball to a locking position in a smaller stepped entry portion.

REFERENCES:
patent: 3813699 (1974-06-01), Giliberty
patent: 4365358 (1982-12-01), Judet
patent: 4380090 (1983-04-01), Romos
patent: 4624674 (1986-11-01), Pappas et al.
patent: 4676799 (1987-06-01), Legrand
patent: 4770659 (1988-09-01), Kendall
patent: 4772296 (1979-10-01), D'Errico
patent: 4798610 (1989-01-01), Averill et al.

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