drophilic crosslinked particles formed from a polymer including polyoxyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol with an aqueous medium containing water soluble polymerEP0376931A1 *17 Dic 19854 Jul 1990Collagen CorporationProcess for making collagen membranous materials for medical useWO1986000912A1 *16 Jul 198513 Feb 1986Pharmacia AbGel for preventing adhesion between body tissues