Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1986-02-19
1988-06-14
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 22, 623 23, A61F 228, A61F 232
Patent
active
047509058
ABSTRACT:
An improved prosthesis construction in a femoral-side hip joint replacement device of the type having an elongate curved stem held within an intramedullary cavity in a femur, and a neck supporting a ball-like joint member at the femur's proximal end. The construction includes an elongate polymer core containing continuous-filament fibers oriented substantially along the length of the core. The core contains the neck, an elongate distal stem whose cross-sectional area is less than about one-quarter that of the neck, and a tapered sections which mates the neck to the stem. A polymer skin fused to and covering the stem and tapered section of the core is shaped and dimensioned to conform to and fill the bone cavity. A braided sheath encases the stem and tapered sections of the core and it embedded in the polymer skin adjacent the core. The filaments which made up the braid in the sheath encircle the core in a helical pattern extending along the stem and tapered section provided resistance to torsional stresses on the stem. Also disclosed are novel methods for making the prosthesis construction.
REFERENCES:
patent: 3683422 (1972-08-01), Stemmer et al.
patent: 3893196 (1975-07-01), Hochman
patent: 3953637 (1976-04-01), Phillips
patent: 4127902 (1978-12-01), Homsy
patent: 4221623 (1980-09-01), Heissler et al.
patent: 4512038 (1985-04-01), Alexander et al.
patent: 4589883 (1986-05-01), Kenna
patent: 4650489 (1987-03-01), Thompson
"The Use of Polymers for Endoprosthetic Components", by Mathys et al.
Early Results of the RM-Isoelastic Cementless Total Hip Prosthesis: 300 Consecutive Cases with 2-Year Follow-Up, by Bombelli et al.
Hansen Thomas
Johnson Roger
Koeneman James
Weinstein Allan M.
Yapp Ron
Apley Richard J.
Cannon Alan W.
Harrington Arthritis Research Center
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