Ball-and-socket joint prosthesis with bearing insert

Details Ball-and-socket joint prosthesis with bearing insert Ball-and-socket joint prosthesis with bearing insert

1986-08-08

1987-12-22

Apley, Richard J.

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

Implantable prosthesis

Bone

623 18, 403135, A61F 234

Patent

active

047144777

ABSTRACT:
A ball-and-socket joint prosthesis, e.g. a hip joint prosthesis, which comprises an outer shell element, a ball component, and a replaceable bearing insert element positioned between the shell and the ball component. The bearing insert has a generally spherical inside surface which encompasses more than half of the ball component to thereby retain it. The insert has an outside surface shaped to mate with the inside surface of the shell, and the shell element and the insert element have a locking mechanism consisting of a protruding portion which extends a major distance around a side surface of one element which locks into a mating depression in the other element. In a preferred embodiment, the insert is horizontally slotted around a major portion, but less than the entire distance around the insert, above that portion of the locking mechanism present on the insert and is vertically slotted from the bottom of the insert to the horizontal slot thereby forming at least one, but preferably two, movable finger(s). The flexibility of the finger(s) allows the ball component to be inserted into and removed from the insert. Once the insert containing the ball component is locked into the shell, the vertical slot may be at least partially closed by moving the finger(s) to disengage the locking mechanism and allow removal of the insert and the ball component from the shell.

REFERENCES:
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patent: 4241463 (1980-12-01), Khovaylo
patent: 4380090 (1983-04-01), Ramos
patent: 4408360 (1983-10-01), Keller
patent: 4624674 (1986-11-01), Pappas et al.
"The OEC Universal Self-Aligning.TM. Acetabular Component", Brochure No. 01-50-1422, Orthopedic Equipment Co., Bourbon, Ind., 6 pages (product on sale in U.S. prior to Aug. 1985).
"Self-Centering.TM. Universal Hip", Brochure No. 382 0601-52, (Rev. 1), DePuy, Warsaw, Ind., 6 pages, (1982).
"Bi-Polar Articulating Components-Surgical Technique", Form No. Y-BMT-011/010184, Biomet, Inc., Warsaw, Ind., 5 pages, (1984).
"Bateman UPF.TM. II Universal Proximal Femur", Brochure No. SD-IUTS(421)NPI, 3M, St. Paul, Minn., 6 pages, (1982).

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