Artificial spinal disc

Details Artificial spinal disc Artificial spinal disc

1987-06-22

1988-07-26

Apley, Richard J.

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

Implantable prosthesis

Bone

A61F 244

Patent

active

047597690

ABSTRACT:
An artificial disc for a human spine. The disc has upper and lower members hinged together at their rear portions and biased apart at their fronts by stiff coil springs. Rear stop surfaces limit the opening movement of the members. Vertically projecting tabs at the front and side of each member are rigidly screwed to the adjacent vertebrae. Tolerances in the hinge allow limited side to side rocking. The disc and screws are made of titanium alloy or cobalt chrome alloy. In a modified version a hinge pin is replaced by cables tying the members together.

REFERENCES:
patent: 3426364 (1969-02-01), Lumb
patent: 4349921 (1982-09-01), Muntz
patent: 4401112 (1983-08-01), Rezaian
patent: 4605417 (1986-08-01), Fleischauer

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