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US 4,098,728 AGranted
Medical surgical sponge and method of making same
OwnerSolomon Rosenblattinventor
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OwnerSolomon Rosenblattinventor
Estimating the term…
A uniformly expandable hydrophilic sponge, adapted for medical usage, characterized by instantaneous wicking and a high liquid holding capacity comprising a reaction product of polyvinyl alcohol and formaldehyde. The wicking and liquid holding capacity is attained by controlling the time, temperature and processing conditions while forming and curing the reaction product in an aqueous medium. The sponge is rendered uniformly expandable by drying the wet sponge while maintaining the shape of the wet sponge. The sponge can be made X-ray opaque by incorporating, homogeneously, throughout an encapsulated radiopaque substance with the formaldehyde and polyvinyl alcohol. The sponge is biocompatible, non-toxic, lint free, compressible, resilient, strong, non-abrasive, free of foreign leachable materials and is of exceptionally high fluid holding capacity.
A biocompatible, polymeric, elastomeric, lint-free, uniformly swellable hydrophilic sponge for medical purposes having a uniform pore geometry and pore size distribution throughout its volume comprising the inorganic acid-catalyzed reaction product of formaldehyde and polyvinyl alcohol, said sponge being characterized by an initial water absorbtion and a wicking point of a maximum of 10 seconds of contact with the body fluid and by a variation in the size of the diameter of the pores of less than about 8 to 1 as determined by a stereoscopic microscope eyepiece.
A biocompatible, polymeric, elastomeric, lint-free, uniformly swellable hydrophilic sponge for medical purposes having a uniform pore geometry and pore distribution throughout its volume comprising the inorganic acid-catalyzed reaction product of formaldehyde and polyvinyl alcohol, said sponge being characterized by an initial water absorption and wicking point of a maximum of 10 seconds of contact with the body fluid, and by a variation in the size of the diameter of the pores of less than about 8 to 1 as determined by a stereoscopic microscope eyepiece and said sponge containing a homogeneously distributed particulate radiopaque material having a coating of polyvinyl alcohol or a reaction product of polyvinyl alcohol and formaldehyde which coating is copolymerized with said acid-catalyzed reaction product of formaldehyde and the polyvinyl alcohol.
Dependencies are inferred from the claim text.