A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
3/123
A61F 2/54 (2006.01) A61F 2/58 (2006.01)
Patent
CA 1252254
ABSTRACT Prosthetic devices of utilitarian, yet natural and unpre- cedented life-like appearance, are formed of durable elasto- mers. A seamless flexible negative mold of a biological body member selected to form the basic model is made by painting on to it nylon mesh-reinforced silicone with direct monitoring and correction of the positioning of the parts. A positive wax model is cast in the mold and subsequently modified by sculpturing to the requirements of the individual for whom the prosthesis is being developed. From the master wax model a negative metal mold is made by electroplating. New and unique provisions for ventilation to effectively remove from the molds solvents of the elastomer dispersions greatly improve the quality and rapidity of production. Invented methods of creating ventilation ports without damage to the critical interior surface of the molds and of degassing the dispersions to eliminate bubble defects are employed. A method of coloration is utilized which closely mimics the pigmentation pattern of normal skin achieving an unprecedented natural appearance. Fingernails precisely duplicated in acrylics are inlayed with a new and secure method of fixation in the case of hand or finger prostheses. Major problems of appropriately filling the prosthetic devices with facility and without distortion have been solved by developing a method of prefabricating the internal filling units. Active or passive mechanical utilitarian devices can be readily incorporated into the versatile prefabricated units.
505625
Beasley Robert W.
Smart & Biggar
LandOfFree
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