Prosthetic device with spacers

Details Prosthetic device with spacers Prosthetic device with spacers

1985-04-24

1986-01-28

Apley, Richard J.

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

Implantable prosthesis

Bone

128 92C, 128 92CA, 623 16, 623 18, A61F 104

Patent

active

045661383

ABSTRACT:
A prosthetic device adapted to be secured to a supporting bone by a thickness of acrylic bone cement. The prosthetic device has an outer surface which includes a plurality of spacers projecting therefrom. The spacers are made of an acrylic material, such as polymethyl methacrylate (PMMA), and are adapted so that when the prosthetic device is positioned against the supporting bone, the spacers provide a uniform space between the bone and prosthetic device, thus uniformly controlling the thickness of cement. The acrylic spacers will repolymerize and bond with the layer of acrylic bone cement. The nature of the bond formed between the new acrylic bone cement and the acrylic spacers should eliminate the stress concentrations at the interface between the spacers and the cement layer, thereby enhancing fixation of the prosthesis.

REFERENCES:
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patent: D232005 (1974-07-01), Farling
patent: 3528109 (1970-09-01), Scales
patent: 3605123 (1971-10-01), Hahn
patent: 4238207 (1980-12-01), Ruschke
patent: 4281420 (1981-08-01), Raab
patent: 4285071 (1981-08-01), Nelson et al.
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patent: 4365359 (1982-12-01), Raab
patent: 4417571 (1983-11-01), Nelson et al.
patent: 4479271 (1984-10-01), Bolesky et al.
Biomet Literature--ES-32 Acetabular Cup--Received Copy 1981, (Actual Date of Publication Not Known).
3M Literature--MMS Acetabular Cups--.COPYRGT. 1983.
OEC Literature--S-12 Cup with Cement Spacers, No Date Available.
Zimmer Brochure No. 82-037-0000-0051, Zimmer.RTM., Total Hip Systems for Revision Surgery--Various Acetabular Cups--.COPYRGT. 1982.
Zimmer Drawing No. 00-8504-765-01/02 Eftekhar Acetabular Standoff--1981.
Zimmer Advertisement--JBJS, Apr. 1983--vol. 65-A, No. 4--DF-80.TM., Total Hip System--Acetabular Cup.
Deloro Surgical Literature--McKee Total Hip Prosthesis--Acetabular Cup--No Date Available.
Zimmer Brochure--No. 81-037-6504-0948, STH.TM.--2, Total Hip Prosthesis--Acetabular Cup--.COPYRGT. 1981.

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