Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Miscellaneous
Patent
1985-10-18
1987-11-03
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Miscellaneous
623 1, 264 41, 264 455, 264 456, 264 48, 521 50, 521 51, 521 57, 521 61, 521 94, 521128, 521130, 128334R, A61F 200, A61F 206, B29C 4152, C08J 900
Patent
active
047041307
ABSTRACT:
A microporous biocompatible material is formed by preparing a segmented polyether urethane urea solution containing 25%.+-.1.5% solids dissolved in a solvent. The solution has sufficient viscosity to be preshaped and formed into the desired thickness of the finished article, then immediately immersed into a precipitation bath in which the solvent in the solution is miscible for a time interval sufficient to cause the solution to set up into an opaque elastomeric article. The article is immediately removed from the bath, any excess solvent extracted and then dried at a temperature on the order of 35.degree. C. to 70.degree. C. followed by heat treating by annealing for approximately sixty minutes at a temperature at 100.degree. C. to 130.degree. C. The void volume of the membrane solution is controlled to within the 50% to 80% range and the pore size from ca <0.1 to several mms. as well as the shape of the pores and solid structures between them, thereby enabling close control over the characteristics and structure of the material as well as over variations in structural characteristics and porosity across the thickness of the material according to its intended application and use.
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Askill Ian N.
Briana Stephen G.
Gilding D. Keith
Reed Andrew M.
Apley Richard J.
Cannon Alan W.
Mitral Medical International, Inc.
Reilly John E.
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