Modular joint prosthesis

Details Modular joint prosthesis Modular joint prosthesis

1989-02-27

1993-03-16

Isabella, David

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

Implantable prosthesis

Bone

A61F 218

Patent

active

051940663

ABSTRACT:
A modular joint prosthesis for implantation in a body. A component adapted to be fixed to a long bone having an intramedullary canal includes an elongated male stem having a uniformly tapered outer surface. In order to accommodate the particular size of long bone to which the component is to be fixed, a properly sized female stem is attached to the male stem before the component is fixed to the long bone. The female stem is adapted to be received in the intramedullary canal for fixation thereto, and has a uniformly tapered inner surface, the angle of the taper being substantially similar to the angle of taper of the outer surface of the male stem. As a result, the male stem and female stem become locked together when the inner surface of the female stem engages the outer surface of the male stem. The proper size of female stem is obtained by selecting it from a family of female stems having a graduated sequence of different external dimensions. Tools are also disclosed for disengaging the male stem from the female stem as well as for disengaging the female stem from the bone.

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D. A. Heck et al, "The Effect of Load Alteration on the Biological and Biomechanical Performances of a Titanium Fiber-Metal Segmental Prosthesis", The Journal of Bone and Joint Surgery Jan. 1986, vol. 68A, No. 1, pp. 118-125.
E.Y.S. Chao, Ph.D., et al, "Modular Prosthetic System For Segmental Bone and Joint Replacement After Tumor Resection", Orthopedics, May 1985, vol. 8, No. 5, pp. 641-651.
"Standard Tapers" from Machinery's Handbook 20th Edition 1722-17 The Medical Journal of Australia Jan. 1934, p. 13.

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