Dehydration of hydrogels
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United States of America Patent
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Jan 6, 1998
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N/A
app pub date -
Jun 2, 1995
filing date -
Jun 2, 1995
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Abstract
A method of dehydration of bulky hydrogel samples of polyvinyl alcohol (i.e., PVA) and a method of preparation of prosthetic nuclei for vertebral discs are given. A method of gamma irradiation sterilization of PVA gel samples which does not incur the side effects of discoloration and of increased crystallinity (i.e., further reduction of water content) is also given. A method of dehydrating bulky hydrogel samples of polyvinyl alcohol (i.e., PVA) so that no significant distortion in the samples results, comprises: (a) subjecting the sample to a solvent system comprising at least one organic solvent which (1) has a solubility for PVA which is less than the solubility of water for PVA and (2) is miscible with water for a length of time generally from about 2 to about 10 days so that the dehydration rate of the hydrogel samples is sufficiently slow so as not to cause any distortions on the dehydrated samples.
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