Screw-threaded acetabular component of hip joint prosthesis

Details Screw-threaded acetabular component of hip joint prosthesis Screw-threaded acetabular component of hip joint prosthesis

1989-08-16

1991-03-05

Isabella, David J.

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

Implantable prosthesis

Bone

A61F 234

Patent

active

049974475

ABSTRACT:
An acetabular implant of a hip joint prosthesis comprising a metal cup shell (2) having an external self-tapping thread extending around the circumference of the shell. The thread is divided into a plurality of segments (8, 10) by a plurality of tapping grooves (16). The thread radius (Ra, Rb, Rc, Rd) of the thread segments (8, 10) progressively decreases from the leading end (12) to the trailing end (14) of a segment (8 or 10). The tapping grooves (16) are preferably arranged in pairs dividing the thread into alternating long (8) and short (10) segments. The construction of the thread reduces the propensity of the implant to jam during insertion.

REFERENCES:
patent: 3894297 (1975-07-01), Mittelmeier et al.
patent: 4563778 (1986-01-01), Roche et al.
patent: 4596580 (1986-06-01), Weill
patent: 4632111 (1986-12-01), Roche
patent: 4650491 (1987-03-01), Parchinski
patent: 4662891 (1987-05-01), Noiles
patent: 4715859 (1987-12-01), Schelhas et al.
patent: 4795469 (1989-01-01), Oh
Socket Fixation Using a Metal-Backed Acetabular Component for Total Hip Replacement; The Journal of Bone and Joint Surgery, vol. 64A, pp. 745-748.
Stress Distribution in the Acetabular Region I. Before and After Total Joint Replacement; 15 J. Biomechanics 155-164, (Pergamon Press Ltd. 1982).
Stress Distribution in the Acetabular Region II. Effects of Cement Thickness and Metal Backing of the Total Hip Acetabular Component, 15 J. Biomechanis, 165-170, (Pergamon Press 1982).
Advances in Total Hip Replacement by W. Harris.
Mecron Med. Produkte GmbH, advertisement: "MECRING.TM.".

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