Process for producing orthopedic structures and a thermoplastic

Details Process for producing orthopedic structures and a thermoplastic Process for producing orthopedic structures and a thermoplastic

1980-10-09

1982-02-23

Morgenstern, Norman

Surgery

Truss

Pad

128 89R, 128 90, 128155, 427 2, 427179, 427246, 4273899, 427392, A61L 1500

Patent

active

043164579

ABSTRACT:
A process for producing a rigid orthopedic cast in which a bandage material is provided which is impregnated or coated in the form of webs or sheets with a solvent solution of a polyurethane prepolymer, a bifunctional chain-extender and a catalyst. The prepolymer urethane having two isocyanate end groups, being formed by the reaction of a bifunctional compound reactive with an isocyanate group with a molar excess of a diisocyanate, forms a final thermoplastic polymer in the presence of the chain-extender when the solvent is removed under evaporative conditions. The heated thermoplastic impregnated fabric can be wrapped in multiple layers under normal conditions around a broken body member, molded and cooled to form a strong, rigid supportive cast which is porous so as to prevent skin maceration or other medical ramifications related to a non-porous material.

REFERENCES:
patent: 3551364 (1970-12-01), McGarr
patent: 3891785 (1975-06-01), Zemlin
patent: 3949742 (1976-04-01), Nowakowski
patent: 4052282 (1977-10-01), Kubushiro
patent: 4124572 (1978-11-01), Mao
patent: 4127124 (1978-11-01), Clagett et al.
patent: 4131114 (1978-12-01), Kirkpatrick et al.
patent: 4143665 (1979-03-01), Custer et al.
patent: 4156067 (1979-05-01), Gould

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