375 results about "Biological adhesion" patented technology

The present invention relates to formulations and methods for the mucosal and parenteral administration of lipid particles an suspensions. The formulations of this invention are stable lipid particles useful for oral delivery of water-insoluble therapeutic agents, vaccines and diagnostics. The compositions of this invention promote the mucosal absorption of biologically active molecules across mucosal epithelial barriers. Stabilization of lipid particles is achieved by coating the hydrophobic central core with a polymer shell. The polymer shell can include bioadhesive agents, ligands, and absorption promoting agents. This invention relates to oral drug delivery systems for hydrophobic drugs, and in particular is concerned with improving the bioavailability of hydrophobic drugs from such systems. Using this system, anticancer drugs such as taxanes are orally effective.

Disclosed herein are an in situ-forming, bioadhesive hydrogel and the medical uses thereof. Being formed by in situ crosslinking through an enzymatic reaction, the hydrogel has an advantage over conventional bioadhesive hydrogels in terms of biocompatibility. In addition, the in situ-forming bioadhesive hydrogel has excellent biocompatibility and mechanical strength and has excellent tissue adhesiveness thanks to modification with / without dopa derivatives. The hydrogel finds a variety of applications in the biomedical field, including bioadhesives or hemostats, implant substances for tissue regeneration and augmentation, carriers for delivering biologically active materials or drugs, etc.

The present invention concerns a prolonged release bioadhesive mucosal therapeutic system containing at least one active principle, with an active dissolution test of more than 70% over 8 hours and to a method for its preparation. The bioadhesive therapeutic system may be in tablet form and may contain quantities of natural proteins representing at least 50% by weight of active principle and at least 20% by weight of the tablet, between 10% and 20% of a hydrophilic polymer, and compression excipients, and may contain between 4% and 10% of an alkali metal alkylsulphate to reinforce the local availability of active principle and between 0.1% and 1% of a monohydrate sugar.

Oral care and other compositions comprising particles having cores attached to bioadhesive polymers for inhibition of pellicle formation, plaque formation, biofilm formation, biofouling, and microbial adhesion or attachment are described. Methods using said compositions to treat surfaces, such as oral surfaces.

Nanoparticles, compositions, and methods for the improved uptake of active agents are disclosed herein. The compositions contain a monodisperse population of nanoparticles, preferably including an active agent, where the nanoparticles are formed from a polymeric material possessing specified bioadhesion characteristics. Following enteral administration, preferably oral administration, the nanoparticles exhibit total intestinal uptakes of greater than 20%, preferably greater than 45%, more preferably greater than 65%. When compared to uptake of the same composition in the absence of the bioadhesive polymeric material, the nanoparticles have significantly increased uptake with intestinal uptake of the increased by more than 100%, preferably even greater than 500%. Further disclosed herein is a method of producing multi-walled nanoparticles, as well as methods of using thereof. Multi-walled particles prepared using the method disclosed herein are useful for controlling the release of active agents.

A cultured periodontal ligament cell sheet is produced by a process comprising culturing cells on a cell culture support composed of a base material whose surface is coated with a temperature-responsive polymer having an upper limit or lower limit critical dissolution temperature in water of 0 to 80° C. under specified conditions, (1) regulating the temperature of a culture fluid to the upper limit critical dissolution temperature or higher or to the lower limit critical temperature or lower, (2) allowing a cultured periodontal ligament cell sheet resulting from the culturing to adhere to a carrier and (3) detaching the sheet intact together with the carrier. This cultured periodontal ligament cell sheet has a syndesmotic microstructure, exhibits extremely high bioadherence to the dental root surface and realizes high density transplantation of target cells and positive reconstruction of periodontal tissues. Moreover, through lamination of cell sheets to be transplanted and donation of a three-dimensional polarity, highly efficient reconstruction of an adhesion apparatus can be accomplished and clinical application thereof to moderate periodontitis, severe peridontitis, gingival recession and the like is highly promising.

The invention provides an ostomy bag assembly comprising outer (2) and inner (4) bags secured to one side of an adhesive flange (6); the adhesive flange (6) having means defining an orifice to enable bodily waste from a stomal opening to be received by the inner bag; wherein the adhesive flange is of laminar construction and comprises, in sequence, from a body-contacting surface outwards:(a) a bioadhesive layer (10) for securing the flange to a body surface of a patient about the stomal opening;(b) a first polymeric support layer (8) attached to the bioadhesive layer (a);(c) a heat sealable layer (16) having a heat sealable adhesive surface which releasably bonds the heat sealable layer to the first polymeric support surface;(d) a second polymeric support layer (14) bonded to the heat sealable layer;(e) a weldable polymeric layer (18) to which the inner and outer bags are attached, the weldable polymeric layer being bonded to the second polymeric support layer;the adhesive flange having an annular channel (20) which surrounds the means defining the orifice and extends through layers (c), (d) and (e) so as to form radially inner (22) and outer (24) attachment zones separated by the annular channel (20), the inner bag (4) being attached to the radially inner attachment zone (22) and outer bag (2) being attached to the radially outer attachment zone (24);and wherein the inner and outer bags (4),(2), together with attached portions of layers (c), (d) and (e) can each be peeled away from the first polymeric support layer (b).Also provided by the invention are adhesive flange blanks from which the ostomy bag assemblies can be manufactured, as well as methods for the manufacture of the ostomy bag assemblies and the adhesive flange blanks.

The invention relates to a graphene catheter composition, a catheter preparation method and an application. The graphene catheter composition comprises the following components by the mass percentages: 90-99.5% of a biodegradable material, and 0.5-10% of graphene. The graphene catheter comprises a catheter and a biological adhesion substance layer, and the biological adhesion substance layer is arranged on the inner wall of the catheter; the catheter is prepared by the graphene catheter composition. The preparation method comprises that the graphene catheter composition is printed in 3D or electrospun to produce a catheter; the interior of the catheter is sprayed with a biological adhesion substance by 3D printing or electrospinning, and the catheter is crosslinked and solidified, so thatthe graphene catheter can be obtained. The catheter can promote regeneration, proliferation and differentiation of nerves, blood vessels and the like. In-vivo experiments show that the repair of animal peripheral nerves such as sciatic nerves is superior to that of autologous nerve transplantation, and practical and clinical value is achieved.