Medical material of polyvinyl alcohol and process of making

Details Medical material of polyvinyl alcohol and process of making Medical material of polyvinyl alcohol and process of making

1985-03-28

1988-03-29

Silbaugh, Jan H.

Prosthesis (i.e., artificial body members), parts thereof, or ai

Implantable prosthesis

264 28, 523309, 524557, 528481, B29C 3516

Patent

active

047340975

ABSTRACT:
Provided is a medical material comprising a molded hydrogel obtained by pouring an aqueous solution containing not less than 6 wt. % of a polyvinyl alcohol which has a degree of hydrolysis not less than 97 mole % and average polymerization degree not less than 1,100, into a desired shape of a vessel or mold, freeze-molding the aqueous solution at a temperature lower than -5.degree. C., then partially dehydrating the resulting molded product without thawing it up to a percentage dehydration not less 5 wt. %, and if required, immersing the partially dehydrated, molded product in water to attain a water content thereof in the range of 45 to 95 wt. %.

REFERENCES:
patent: 4472542 (1984-09-01), Nambu
patent: 4524064 (1985-06-01), Nambu
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Singh et al., "Polymeric Hydrogels: Preparation & Biomedical Applications" J. Scientific & Industrial Research, vol. 39, Mar. 1980, pp. 162-171.
Takahashi et al. "The Melting Temperature of a Thermally Reversible Gel. III Poly(Vinyl Alcohol)--Water Gels" Polymer J., vol. 6, pp. 103-107, 1974.
Tesoro, "Cross-Linking of Cellulose with Polyfunctional Sulfones Under Anhydrous Conditions," Textile Research J., Mar. 1962, pp. 189-201.
Drost-Hansen, "Role of Water Structure in Cell-Wall Interactions," Federation Proceedings, vol. 30, Sep./Oct. 1971 pp. 1539-1548.
Marvel & Denoon, "The Structure of Vinyl Polymers II Polyvinyl Alcohol".
Reimschuessel, "Structural Studies of Organic Gels by SEM" J. Materials Science, 1974, pp. 1815-1822.
Andrade et al., "Water as a Biomaterial" Transactions American Society for Artificial Internal Organs, vol. 19, 1973 pp. 1-7.

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