Method and apparatus for prosthesis placement

Details Method and apparatus for prosthesis placement Method and apparatus for prosthesis placement

1987-01-22

1989-11-21

Rosenbaum, C. Fred

Surgery

Instruments

Orthopedic instrumentation

623 22, A61F 104

Patent

active

048815365

ABSTRACT:
An improved surgical procedure for orthopedic implantation of a prosthesis where the conventional metal prosthesis is provided with an integral collar of a bone cement compatible polymer coating of a desired thickness and shape. The collar thickness serves to operably effect a seal with the bone so the prosthesis becomes a pressurizing plunger during the last phase of inserting the prosthesis into the bone opening or cavity. A slowly developing pressure build up of the viscous bone cement provided by the tapered shape of the collar thickness assures bone cement flow into all bone crevices and minimizes bone cement porosity by reducing the size of the voids formed by entrapped air during curing of the bone cement. The preformed collar also provides a predetermined thickness or layer of bone cement at the critical structural locations in order to ensure the surgeon of optimum physical characteristics of the bone cement at that location and avoid direct contact of the metal prosthesis with the bone. The collar also functions as a positioning mechanism to assit the surgeon in proper positioning of the prosthesis. The precoated prosthesis is also disclosed and claimed.

REFERENCES:
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patent: 4274163 (1981-06-01), Malcom et al.
patent: 4365357 (1982-12-01), Droenert
patent: 4462394 (1984-07-01), Jacobs
patent: 4466435 (1984-08-01), Murray
patent: 4488549 (1984-12-01), Lee et al.
patent: 4562548 (1986-01-01), Kranz
patent: 4595006 (1986-06-01), Burke et al.
patent: 4650489 (1987-03-01), Thompson

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