Fixation elements for artificial joints

Details Fixation elements for artificial joints Fixation elements for artificial joints

1983-11-21

1987-05-05

Apley, Richard J.

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

Implantable prosthesis

Bone

623 16, 128 92R, 128 92VJ, 128 92VV, A61F 234

Patent

active

046628916

ABSTRACT:
Fixation elements for the socket portions of artificial ball and socket joints are provided which include a self-tapping screw thread, a plurality of cutting teeth and a spherical dome. A spherically-shaped cavity having a radius either approximately equal to or slightly greater than the radius of the spherical dome of the fixation element is reamed into a bony structure. The fixation element is screwed into the cavity using the self-tapping screw thread. The cutting teeth form an aperture in the cavity in advance of the self-tapping thread to aid the thread in cutting into the walls of the cavity. In certain embodiments of the invention, a family of fixation elements is provided having related threads with at least a portion of the thread increasing in size from the smallest to the largest member of the family.

REFERENCES:
patent: 1288893 (1918-12-01), Holmes
patent: 2696817 (1954-12-01), Prevo
patent: 3044341 (1962-07-01), Stern
patent: 4116200 (1978-09-01), Braun et al.
patent: 4262369 (1981-04-01), Roux
patent: 4404691 (1983-09-01), Buning et al.
patent: 4433686 (1984-02-01), Charnley

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