3 results about "Polyvinyl alcohol sponge" patented technology

This invention discloses a polyvinyl alcohol (PVA) sponge material, its preparation method, and its applications. The PVA sponge material is obtained from PVA through ice crystal pore formation and oxidative modification. The PVA sponge material obtained by this invention has a continuous porous structure, and the oxidatively modified PVA sponge possesses aldehyde and carboxyl groups, exhibiting active coagulation function and improving coagulation efficiency. Compared with traditional PVA sponge molding methods, this invention significantly reduces the amount of crosslinking agent aldehyde used, thereby reducing the risk of subsequent biotoxicity. It also avoids biotoxicity caused by incomplete surfactant rinsing and the large amount of wastewater generated during rinsing, which is beneficial for industrial applications.

The application discloses a hemostatic device applied to various irregular wounds and belongs to the technical field of medical first-aid equipment, which comprises a solid syringe and a medical polyvinyl alcohol sponge strip; the medical polyvinyl alcohol sponge strip can be axially and radially expanded and is punched into a wound by the device, and the sponge strip is used for omnibearing compression hemostasis; meanwhile, the segmented design of the sponge strip allows the selection of a proper number of segments according to the actual length of the wound, so that the wound can be completely covered; after the sponge strip enters the wound, the sponge strip rapidly absorbs blood and expands, generates uniform pressure, effectively seals blood vessels and achieves the purpose of hemostasis; the radial and lateral expansion of the hemostatic sponge strip is realized, the irregular wound is fully covered, the hemostasis effect is remarkably improved, the segmented design makes the hemostatic device capable of flexibly adapting to wounds of different sizes and shapes, the use of additional cutting tools is reduced, the operation process is simplified, the efficient hemostasis mechanism shortens the treatment time, reduces the risk and discomfort of patients and improves the success rate of first aid.

This invention discloses a polyvinyl alcohol (PVA) sponge, its preparation method, and its applications. The PVA sponge comprises a PVA sponge matrix and a layer of polyphenolic compounds on its surface, wherein a polymer with hemostatic properties is grafted onto the surface of the PVA sponge matrix via polyphenolic compounds. This invention utilizes PVA sponge and the biomimetic principle of mussels to construct a secondary reaction platform on the sponge through the strong adhesive effect of polyphenolic compounds. Then, through Schiff base reaction and free radical polymerization, natural polymers with hemostatic properties are grafted onto the sponge, resulting in a PVA hemostatic sponge with excellent hemostatic and mechanical properties for battlefield wound first aid.