A - Human Necessities – 61 – L
Patent
A - Human Necessities
61
L
18/28, 167/326,
A61L 27/00 (2006.01) A61F 2/06 (2006.01) A61F 13/00 (2006.01) A61L 15/26 (2006.01) A61L 15/42 (2006.01) A61L 27/18 (2006.01) B29C 47/00 (2006.01) C08J 9/28 (2006.01) A61F 2/00 (2006.01) A61F 13/15 (2006.01)
Patent
CA 1322834
63884-29 Abstract of the Disclosure A microporous biocomatible material is formed by preparing a segmented polyether urethane urea solution con- taining 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 801- vent extracted and the article is then dried at a temperature on the order of 35°C. to 70°C. followed by heat treating by annealing for approximately sixty minutes at a temperature at 100°C. to 130°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 con- trol over the characteristics and structure of the material as well as other variations in structural characteristics and por- osity across the thickness of the material according to its intended application and use.
520830
Askill Ian N.
Briana Stephen G.
Gilding D. Keith
Reed Andrew M.
Advanced Medical Solutions Limited
Mitral Medical International Inc.
Smart & Biggar
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