388 results about "Biological adhesion" patented technology

A composition for delivering a tumor therapeutic agent to a patient includes a fast-release formulation of a tumor apoptosis inducing agent, a slow-release formulation of a tumor therapeutic agent, and a pharmaceutically acceptable carrier. An apoptosis-inducing agent in a pharmaceutically acceptable carrier may be administered before or concomitantly therewith. Nanoparticles or microparticles (e.g., cross-linked gelatin) of the therapeutic agent (e.g., paclitaxel) also may be used. The nanoparticles or microparticles may be coated with a bioadhesive coating. Microspheres that agglomerate to block the entrance of the lymphatic ducts of the bladder to retard clearance of the microparticles through the lymphatic system also may be employed. This invention also uses drug-loaded gelatin and poly(lactide-co-glycolide) (PLGA) nanoparticles and microparticles to target drug delivery to tumors in the peritoneal cavity, bladder tissues, and kidneys.

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.

Semisolid mucoadhesive formulations for vaginal application, with improved technical and organoleptic characteristics, which contain at least two bioadhesive gelling polymers and an active ingredient, useful in the prevention and / or treatment of various pathologies and disorders in human beings or animals.

Bioadhesive drug formulations that adhere to an oral mucosal membrane of a subject are provided together with single dose applicators and devices for delivering the drug formulations to the oral mucosa, and methods for using the same.

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.

The invention relates to a novel concrete artificial fish reef which is prepared from the following raw materials in proportion: cement, sand, stones, mixing water, oyster shell powder, fly ash and mineral powder, wherein the weight ratio of the raw materials is 1:(1.9-2.6):(2.8-3.9):(0.4-0.6):(0.1-0.2):(0.1-0.3):(0.1-0.5). A preparation method of the novel concrete artificial fish reef comprises the following steps of adding the raw materials to a concrete mixer, stirring, then placing on a vibrating table for vibrating uniform compaction, and splitting a mould after 12-34 hours; and after the mould is split, carrying out standard maintenance for 28 days. The novel concrete artificial fish reef disclosed by the invention can not dissolve out a harmful substance in a using process or influence the biological adhesion, has no pollution on the environment, is more suitable for an ocean environment on property and can be improved in artificial fish reef effect.

The invention relates to a composition comprising a pharmaceutically active agent and a bioadhesive delivery system that provides for the oral delivery of a vaccine to animals, particularly aquatic animals.

Bio-adhesive textured surfaces are described which allow implants to be localized within a living body. Hierarchical levels of texture on an implantable medical device, some capable of establishing a Wenzel state and others a Cassie state, are employed to interface with living structures to provide resistance to device migration. Since a gaseous state is traditionally required to establish a Cassie or Wenzel state, and gases do not remain long in living tissue, described are tissue / device interactions analogous to the above states with the component normally represented by a gas replaced by a bodily constituent, wherein separation of tissue constituents develops and an analogous Cassie, Wenzel or Cassie-Wenzel state evolves.

The disclosure relates to a composition that is liquid at a temperature below the body temperature of a mammal and that solidifies at or above the body temperature of the mammal. The composition includes a thermally-desolubilizable polymer interspersed with a polymeric component of extracellular matrix and an encapsulated form of an amine compound (preferably an aminated component of extracellular matrix) that is de-encapsulated in the body of the mammal. The polymeric component is able to form covalent bonds with amine moieties in the aminated component, in one or more tissues in the body of the mammal, or both. Upon injection of a liquid suspension of these components into the body of the mammal, the thermally-desolubilizable polymer condenses, entrapping the polymeric component. The polymeric component binds covalently with a tissue in the body, and the aminated component end-caps the remaining reactive moieties of the polymeric component, forming a matrix at the site of injection. The disclosure also relates to uses of such compositions for forming a matrix on or within the body of a mammal. The compositions have a variety of uses, such as as bioadhesives, as sealants for ruptured tissues, as drug or imaging agent depots, or as mechanical cushions.

The invention relates to anti-bioadhesion polyelectrolyte gel as well as a preparation method and application thereof. The preparation method comprises the steps of uniformly mixing one or several polyelectrolyte polymer solutions with opposite charges in a charge ratio of 1 to 1, and generating gel by virtue of a physical crosslinking method, or a chemical crosslinking method or the combination of two methods, wherein positive charges and negative charges are balanced, and the form gel is electroneutral. The preparation method of the polyelectrolyte gel is simple and easy to operate, and theprepared gel has good protein adsorption resistance, is high in water content, does not cause inflammatory reaction and is beneficial to the mass transfer between a transplant and an organism. Therefore, the polyelectrolyte gel can be widely applied to the biomedical fields, particularly can be used for treating diabetes mellitus through packaging of islet cells and can be used as a drug release carrier, a wound dressing, a tissue repair scaffold material and the like.

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.

The invention relates to a sustained-release oral ulcer film having biological adhesion and a preparation method of the sustained-release oral ulcer film. According to the formula, the sustained-release oral ulcer film having the biological adhesion consists of the following components in percentage by weight: 5-50% of a bio-adhesion material, 5-80% of a sustained-release film forming material, 0.5-10% of a medicine, 1-50% of a supporting agent, 1-20% of a plasticizer, 0.1-0.5% of a bacteriostatic agent and 0.5-1% of a flavoring agent. The film provided by the invention, which is prepared in a specific production mode, is good in stability, and excellent biological adhesion and sustained-release performance of the film can be kept for a long time; a soluble sustained-release gel can be gradually formed as the film is adhered to an ulcer surface and absorbs water, so that contact of the ulcer surface with external side is prevented; the oral ulcer film provided by the invention has the characteristics of diminishing inflammation, alleviating pain, achieving an antibacterial effect and being free from toxins, irritation, mutagenic action and the like; and the oral ulcer film can promote growth of blood vessel endothelium and proliferation of fibroblasts and keratinocytes, and subsequently, the oral ulcer film can promote regeneration, repair of healing of the ulcer surface.

The invention belongs to the technical field of medicines and discloses an itraconazole temperature-sensitive type gel preparation as well as a preparation method and application thereof. The itraconazole temperature-sensitive type gel preparation is composed of the following components in percentage by weight: 0.02-3% of medicines, 0.05-15% of solubilizing agent, 5-50% of gel matrix, 0-15% of biological adhesive, 0.001-2% of preservative, 0-10% of other additives and the balance of solvent. The itraconazole temperature-sensitive type gel preparation can regulate gelatinization temperature by adjusting composition and control drug release rate and degree, can effectively inhibit growth of candida in vitro and can be used for drug administration on skins, eyes, nasal cavity, oral cavity, straight intestine or vaginal mucosa. The itraconazole temperature-sensitive type gel preparation has obvious slow release and biological adhesion property and can prolong action time of medicines on an infection part, realize long-acting treatment, reduce dosage and toxic and side effects and improve patient compliance.

The invention relates to a super-hydrophilic and underwater super-oleophobic coating, as well as a preparation method and application thereof. According to the invention, an organic / inorganic hybrid sol preparation method and a surface coating method are adopted, an organic / inorganic hybrid coating containing zwitter-ion groups with a certain thickness is constructed on the material surface, and is prepared through mixing alkoxy silane functionalized glycine betaine type zwitter-ion compound and silicon dioxide particles with other auxiliaries and performing hydrolysis, coating and thermal treatment. The functional coating provided by the invention is super-hydrophilic in air and super-oleophobic underwater; as the glycine betaine type zwitter-ion compound simulating the cell outer membrane molecular structure is introduced in the prepared super-hydrophilic underwater super-oleophobic coating, the prepared functional coating has the self-cleaning function, the antifogging function, the underwater oil resistance function, and the like, and has excellent bioadhesive resistance; the coating, the method and the application thereof have the advantages that the technology is simple, raw materials are easy to obtain, the equipment is simple, the cost is low, and the coating can be large-area prepared.

Formulations and methods for transmucosal delivery of a beneficial agent are described in which a pH-responsive component and a temperature-responsive component are combined and applied to a mucous membrane. The temperature-responsive component is a component that, in aqueous solutions, is capable of undergoing a temperature-dependent sol to gel phase transition. The formulations may be characterized as having bioadhesive properties, and are suitable for delivery of a variety of beneficial agents.

A pharmaceutical composition for the treatment of acute disorders is described. The composition comprises an essentially water-free, ordered mixture of at least one pharmaceutically active agent in the form of microparticles which are adhered to the surfaces of carrier particles which are substantially larger than the particles of the active agent or agents, and are essentially insoluble or sparingly soluble in water, in combination with a bioadhesion and / or mucoadhesion promoting agent adhered to the surfaces of said carrier particles. The composition is primarily intended for sublingual or intranasal administration. The invention also relates to a method for preparing the composition and to the use of the composition for the treatment of acute disorders.

The invention relates to a medicinal composition for treating bacterial vaginitis, which comprises main medicaments, substrates, a bioadhesive material, a release rate regulator and other additives. The medicinal composition for treating bacterial vaginitis has specific biological adhesion, keeps longer time, reduces leakage of the medicaments, prolongs the contact time of the medicaments and the vagina mucosa, and guarantees the curative effect. The composition has specific vagina slow release performance, and can continuously release the medicaments for 2 to 7 days. Compared with the common preparation, the medicinal composition prolongs the releasing time of the medicaments, can reduce the administration times, and is convenient for the patient to take. As simultaneously the medicinal composition has the characteristics of biological adhesion and slowly-released long effect, the medicinal composition has no requirement for the administration time, and the administration can be carried out at any time.

The invention discloses a super-hydrophilic and underwater super-lipophobic coating which consists of a substrate and an organic / inorganic hybrid coating, wherein the organic / inorganic hybrid coating containing an ampholytic ionic group is coated on the surface of the substrate. 1, the method disclosed by the invention is simple in process, easy in preparation of raw materials, simple in equipment and low in cost, and the functional coating can be prepared on the surfaces of different substrates in a large area, so as to achieve super hydrophilicity and underwater super lipophobicity; and 2, by introducing a betaine-type ampholytic ionic compound of a cell outer membrane simulating molecular structure to the prepared super-hydrophilic and underwater super-lipophobic coating, the prepared functional coating not only has functions of self-cleaning, anti-fogging, underwater oil resistance and the like, but also has excellent performances of resisting biological adhesion and the like.

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 relates to a trans-mucosal component for a dental implant intended to support a prosthetic installation. The trans-mucosal component has been designed for the purpose of improving the quality and stability of the biological adhesion of the junctional epithelium and of the connective tissue and wherein the trans-mucosal component (2) is provided with a waist-shaped or inwardly narrowed part for reducing the necessary height of the trans-mucosal component and creating a volume for generation of a stabilizing and retentive belt of soft tissue. According to the invention the distance in the longitudinal direction along the contact surface of the waist-shaped or narrowed part should at least correspond to the required, biological width of the adjoining soft tissue.

The invention discloses a preparation method of zwitter-ion / grapheme composite hydrogel. The composite hydrogel is prepared by taking aminated grapheme as an initiating and crosslinking center through initiating the polymerization of zwitter-ion monomers by using a copper-amine redox initiation system. The preparation method disclosed by the invention is simple in process, and suitable for industrial production. The zwitter-ion / grapheme composite hydrogel prepared according to the invention is prepared by taking grapheme as an initiating and crosslinking center, so that the preparation method is high in mechanical strength and good in chemical stability, and can have good biological compatibility and biological adhesion resistance, and therefore, the preparation method has a broad application prospect in the field of biomedicine.

The invention discloses a bio-adhesion-resistant porous separation membrane as well as a preparation method and an application thereof. The bio-adhesion-resistant porous separation membrane is a flat plate type or hollow fiber type porous membrane with the zwitterion characteristic at about pH 7 after a porous polymer membrane with the surface containing epoxy groups and primary amino groups of amino acid have an epoxy ring-opening reaction. The preparation method comprises steps as follows: the porous polymer membrane with the surface containing the epoxy groups is soaked in a solution containing amino acid, the epoxy ring-opening reaction is conducted at a slightly alkaline condition, then the pH is adjusted to range from 5 to 9, and the bio-adhesion-resistant porous separation membrane with the surface containing amino cations and carboxylate radical anions is obtained. The separation membrane has the characteristic of bio-adhesion resistance and can be used for separation and purification.

The invention discloses azithromycin gel eye drops and a preparation process thereof. The eye drops are prepared from a main medicine, namely azithromycin and excipients such as an adhesive, a gel matrix, an isotonic regulator, a preservative, an antioxidant, a buffering agent and the like. The adhesive, namely polycarbophil in the eye drops can increase the biological adhesion of the eye drops, so that the detention time of medicines in eyes is further prolonged. The invention provides a practical, convenient and reliable ophthalmic preparation for treating bacterial conjunctivitis, and solves the problems that the detention time of medicines in an eye drop formulation in the eyes is short, the medicines are not easy to absorb, the bioavailability is low and the like.

The invention relates to a resveratrol oral administration drug delivery system prepared through the nanometer technology. The drug delivery system is made of the resveratrol and bearer material of wheat gliadin. By utilizing the characteristic that the nanometer granule is highly dispersed and that of biological adhesion of the bearer material, the contact area and contact time of the resveratrol and absorption region of the intestinal canal is increased, which can promote absorption of the small intestine. In addition, the resveratrol oral administration nanometer drug delivery system is distributed over the suitable auxiliary-material skeletal material to improve the dissolve velocity and degree of the resveratrol.

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.

The invention is a device comprising a substrate and a material provided on at least a portion of the substrate and having an exposed surface. The exposed surface of the material is non bio-adhesive. The invention further includes a non bio-adhesive material composition and a method of making a device having the same non bio-adhesive surface. The invention further provides a device having a coating of a hydrophobic material. In particular, the hydrophobic material coated portion of the device is resistant to bio-adhesion.