A hydrogel that adheres to the surface of materials is provided by using as constituent elements a water-soluble main chain monomer, crosslinking agent, polymerization initiator, and adhesive monomer having at least a catechol group in a side chain.

Methods and techniques for forming high concentration hydrogels are disclosed herein. The presently disclosed high concentration hydrogels are formed using controlled dehydration and optional rehydration techniques, depending on desired use. The disclosed high concentration hydrogels may include agarose with or without other hydrogels or therapeutic agents, such as hyaluronic acid, present.

A soft film, a sponge, or a sheet in the dried state is provided, which is capable of forming a hydrogel absorbing water or blood. The film is obtainable by preparing a film-state material in the dried state from either a solution of poly(acrylic acid) or a solution of polyvinylpyrrolidone, and bringing the film-state material into contact with the other remaining solution, and then drying or freeze-drying it.

This invention provides preparations, compositions, products, and applications of photo-crosslinked hydrogels. Component A—a photosensitive polymer derivative, component B—the photoinitiator, and auxiliary component C—other biocompatible polymer derivative each are respectively dissolved in a biocompatible medium to obtain solution A, solution B, and solution C. The solution A, the solution B, and the optional solution C are mixed homogenously to obtain a hydrogel precursor solution. The hydrogel precursor solution is subject to irradiation of the UV light for photocoupled crosslinking to form a photo-crosslinked hydrogel. The photo-crosslinked hydrogel exhibit rapid speed of photo-curing, strong tissue adhesion, excellent mechanical properties, good biocompatibility, and excellent clinical operability. In addition, this invention also provides a kit for making the photo-crosslinked hydrogel, and applications thereof in tissue engineering, regenerative medicine, 3D printing, and as a carrier of cell, protein, or drug.

The present invention provides a biphasic formulation, comprising a liquid layer on the outside and an elastic hydrogel wherein the water formed on the surface of the elastic gel is physically cooling the skin by evaporating and to give a first boost of the active ingredients directly when placing on the skin of humans or animals. The biphasic formulation according to the present invention may be arranged in a hydrogel patch which creates an environment that relieves or promotes the healing process for the treatment of insect bites, sunburn, erythema, pruritus, acne, dry skin or callus. In accordance with the present invention, there is provided a biphasic hydrogel composition, comprising 6% or less PVA, physical crosslinking, glycerol as humectant and the use of water impermeable packaging to reach equilibrium of the syneresis and preserve the moisture of the gel during long-term storage.

The present invention provides a biphasic formulation, comprising a liquid layer on the outside and an elastic hydrogel wherein the water formed on the surface of the elastic gel is physically cooling the skin by evaporating and to give a first boost of the active ingredients directly when placing on the skin of humans or animals. The biphasic formulation according to the present invention may be arranged in a hydrogel patch which creates an environment that relieves or promotes the healing process for the treatment of insect bites, sunburn, erythema, pruritus, acne, dry skin or callus. In accordance with the present invention, there is provided a biphasic hydrogel composition, comprising 6% or less PVA, physical crosslinking, glycerol as humectant and the use of water impermeable packaging to reach equilibrium of the syneresis and preserve the moisture of the gel during long-term storage.

The present invention provides a biomaterial that is excellent in scratch resistance and retention in a case of being brought into contact with water. The biomaterial according to the embodiment of the present invention is a biomaterial including a neutral acyl lipid, at least one selected from the group consisting of a phospholipid and a quaternary ammonium salt, and a carboxyvinyl polymer. The neutral acyl lipid includes at least one selected from the group consisting of a neutral monoacyl lipid and a neutral diacyl lipid, and a content of the at least one selected from the group consisting of the neutral monoacyl lipid and the neutral diacyl lipid is 80% by mass to 100% by mass with respect to a total mass of the neutral acyl lipid.

The present invention provides a biomaterial that is excellent in scratch resistance and retention in a case of being brought into contact with water. The biomaterial according to the embodiment of the present invention is a biomaterial including a neutral acyl lipid, at least one selected from the group consisting of a phospholipid and a quaternary ammonium salt, and a carboxyvinyl polymer. The neutral acyl lipid includes at least one selected from the group consisting of a neutral monoacyl lipid and a neutral diacyl lipid, and a content of the at least one selected from the group consisting of the neutral monoacyl lipid and the neutral diacyl lipid is 80% by mass to 100% by mass with respect to a total mass of the neutral acyl lipid.

Medical dressings include a non-woven polymeric nanofiber mat embedded within a chitosan hydrogel matrix. The dressings may be obtained by electro spinning of polymeric nanofibers and thereafter incorporating a chitosan hydrogel into interstices of the mat by vacuum or positive pressure assistance. The resulting medical dressings may be optically transparent (e.g., at least about 50% up to about 95% light transmittance), flexible, and mechanically robust. The dressings may also incorporate self-adhesion promoters to allow self-adhesion to biological tissue, e.g., ocular surfaces, and/or therapeutic agents which are capable of delivering therapeutics (e.g. stem cells, drugs and the like) to the tissue surface. The dressings are especially useful as ocular bandages for the treatment and repair of ocular wounds.

Medical dressings include a non-woven polymeric nanofiber mat embedded within a chitosan hydrogel matrix. The dressings may be obtained by electro spinning of polymeric nanofibers and thereafter incorporating a chitosan hydrogel into interstices of the mat by vacuum or positive pressure assistance. The resulting medical dressings may be optically transparent (e.g., at least about 50% up to about 95% light transmittance), flexible, and mechanically robust. The dressings may also incorporate self-adhesion promoters to allow self-adhesion to biological tissue, e.g., ocular surfaces, and/or therapeutic agents which are capable of delivering therapeutics (e.g. stem cells, drugs and the like) to the tissue surface. The dressings are especially useful as ocular bandages for the treatment and repair of ocular wounds.