Overview: .The studies on Biohydrogels have had a rapid, exponential evolution in the last..decades. Starting from one of the first applications of hydrogels in surgery,..polyvinylalcohol crosslinked with formaldehyde under the trade name of Ivalon, we..passed through PolyHema hydrogels as contact lens materials, hydrophilic..polyurethanes (HPU), biodegradable hydrogels for both reconstructive surgery and..pharmaceutical delivery systems, and finally more recently, one decade old, the..thermoreversible and transient network hydrogels. Of course all these classes of..hydrogels have been always
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