144 results about "Polylactide co glycolide" patented technology

In one aspect, the present disclosure relates to a surgical device including an anchor body having an opening, the anchor body having a copolymer composition including polylactide-co-glycolide and calcium carbonate, wherein the calcium carbonate comprises more than 30% but less than 40% of the weight of the composition; and a flexible member passing through the opening, wherein deformation of the device occurs at body temperature. The present disclosure also relates to an oriented polymer material having a copolymer composition including a polylactide-co-glycolide and calcium carbonate, the calcium carbonate comprising more than 30% but less than 40% of the weight of the composition, wherein the material changes shape upon introduction to an environment having a temperature that is lower than a relaxation temperature of the material. A method of repairing soft tissue and other surgical devices are also disclosed.

Biodegradable polymeric microparticle compositions containing one or more active agents, especially those useful for treating or preventing or one or more diseases or disorders of the eye, and methods of making and using thereof, are described. The microsphere compositions release an effective amount of the one or more active agents for a period greater than 14 days in vivo, preferably greater than 60 days in vivo, more preferably up to 73 days in vivo, more preferably greater than 90 days in vivo, even more preferably over 100 days in vivo, and most preferably greater than 107 days in vivo. In a preferred embodiment, the microparticle compositions contain one or more active agents useful for managing elevated intraocular pressure (TOP) in the eye. In one embodiment, the microspheres are formed from polylactide-co-glycolide (“PLGA”); in another embodiment, the microspheres are formed from a blend PLGA and poly lactic acid (“PLA”). Relatively hydrophilic, and preferably carboxylated, polymeric materials such as PLGA are used for a drug such as timolol maleate, which is relatively water soluble, to increase drug loading. Higher molecular weight polymers, as well as the ratio of LA (which has a longer degradation time, up to one to two years) to GA (which has a short degradation time, as short as a few days to a week), are used to provide release over a longer period of time. The combination of drug loading and release rate, as well as the minimization of initial burst release, result in prolonged release of a higher amount of drug.

The invention discloses slow-release microspheres coated with rivastigmine tartrate/rivastigmine for PLGA/PLA injection and a preparation method thereof. The slow-release microspheres mainly comprise rivastigmine tartrate/rivastigmine and PLGA and PLA serving as biodegradable polymer medicinal materials, and can be prepared by adopting a W1/O/W2 composite emulsified solvent volatilization method, an O/W emulsified solvent volatilization method, an O1/O2 emulsion drying method and a spray drying method. The grain diameter of the microspheres is less than 100 microns. The slow-release microspheres have high medicament loading amount, have no obvious burst release effect, can be continuously released for one week, one mouth or three mouths, are used for treating senile diseases such as Alzheimer's disease, Parkinson disease and the like, and can prolong the acting time of the medicament, reduce the application times and greatly improve the administration compliance of patients.

The present invention provides one kind of slow-releasing basic fibroblast growdth factor (bFGF) microsphere and its preparation and use. The microsphere has coated bFGF as medicine, and matrix of polylactide-co-glycolide (PLGa). The slow-releasing bFGF microsphere is prepared by using PVA or mixed PVA-PEG liquid as dispersing medium and through w/o/wt% re-emulsion and drying process and mechanical stirring. Its freeze dried power has good dispersivity and low organic solvent residue. The present invention can be used for local administration or vein administration of treating fracture, bone defect and other diseases.

The invention discloses a slow-release microsphere preparation containing a recombined human haemopoietin. The slow-release microsphere preparation is prepared by the S/O/W compound emulsion solvent volatilization method. The preparation method comprises that: firstly, by the freeze-drying method, a micro particle containing the human serum albumin and the recombined human haemopoietin is prepared; secondly, by using a biodegradable high molecular material of lactic acid-glycollic acid block copolymer as a carrier material, the micro particle containing the human serum albumin and the recombined human haemopoietin is encapsulated; and thirdly, the lactic acid-glycollic acid block copolymer slow-release microsphere preparation containing the recombined human haemopoietin is prepared. The microsphere of the invention has the advantages of smooth surface, uniform appearance, regular size and no adhesion, the average particle size is between 70 and 105mu m; moreover, the microsphere is high in drug-carrying quantity and encapsulating rate, and the in vitro slow release period is more than 30 days. The obtained slow-release microsphere preparation is good in biocompatibility and can be used for non-intravenous drug administration such as hypodermic drug administration and intramuscular drug administration, and when used as a drug preparation for treating renal anemia, the slow-release microsphere preparation can improve the hematocrit of a patient.

The invention discloses a preparation method of a high-adsorbability cellulose diacetate composite electrostatic spinning nanofiber ordered porous film. The preparation method comprises the following steps: dissolving cellulose diacetate and polycaprolactone, or cellulose diacetate and a lactic acid-glycolic acid copolymer, or cellulose diacetate and polyvinylpyrrolidone into an organic solvent so as to prepare a spinning solution, and preparing the cellulose diacetate composite electrostatic spinning nanofiber ordered porous film by adopting an electrostatic spinning method. The method disclosed by the invention is simple, and cannot pollute the environment in the preparation process. The prepared cellulose diacetate composite electrostatic spinning nanofiber ordered porous film has tiny fiber diameter, good pore diameter and order degree, is good in dry and wet state adsorption performances, is high in water absorption, can be applied to the flue gas and tobacco industry of the dry state and wet state adsorption and filtration separation industry, is wide in market application prospect, and has relatively high application value.

The invention relates to novel absorbable polyesters, produced by ring-opening polymerisation of hydroxycarboxylic acids in the presence of a polyol containing an electrolyte, in an extruder. In particular, the invention relates to novel polylactide glycolide polyesters which are essentially free of dextran sulphate and which are produced by ring-opening polymerisation of lactide and glycolide in the presence of dextran sulphate in the extruder; to the production of the same and to their use in depot medicaments.

The invention discloses a double-layer sustained and controlled release nanoparticle and a preparation method thereof and application in preparation of antitumor medicines. The double-layer sustained and controlled release nanoparticle is formed by a lactic acid-glycolic acid copolymer nanoparticle inner core and a polyethylene glycol questin grafting chitosan casing covering an outer layer of the lactic acid-glycolic acid copolymer nanoparticle inner core and can simultaneously load hydrophilic and lipophilic medicines. The drug entrapment rate is high, time-ordered release of inner layer medicines and outer layer medicines can be achieved, the double-layer sustained and controlled release nanoparticle has the effects of sustained release and controlled release, and in addition, the double-layer sustained and controlled release nanoparticle further has the advantages of being controllable in grain size, uniform in particle size distribution, smooth and round in forma and good in stability and dispersibility and the like.

The invention discloses an all-trans retinoic acid-camptothecin anticancer drug conjugate as well as a preparation method and application thereof. The structural formula of the all-trans retinoic acid-camptothecin anticancer drug conjugate is shown in a formula (I), (II), (III), (IV), (V) or (VI). The all-trans retinoic acid-camptothecin anticancer drug conjugate has good solubility in Tween, polyoxyethylene castor oil, a Poly(ethylene adipate)-polylactic acid copolymer and a Poly(ethylene adipate)-poly (lactic acid-glycollic acid) copolymer, can be self assembled into nanometer grains in water, can be directly injected or taken orally or processed into other dosage forms. According to the all-trans retinoic acid-camptothecin anticancer drug conjugate disclosed by the invention, as all-trans retinoic acid and SN-38 or camptothecin take synergistic effect, compared with a conjugate only containing one of irinotecan, SN-38 and all-trans retinoic acid, the all-trans retinoic acid-camptothecin anticancer drug conjugate has good tumor suppression effect.

The invention discloses a local sustained release preparation for preventing and treating osteomyelitis, a preparation method and application thereof. The preparation comprises the following components in percentage by weight: 0.01 to 1 percent of staphylococcus lysozyme, 1 to 20 percent of polylactic acid (PLA), 0.5 to 10 percent of polylactide-co-glycolide (PLGA), and 70 to 90 percent of calcium phosphate cement (CPC). The preparation takes the staphylococcus lysozyme as a bactericidal active component to obtain PLA-PLGA polymer microspheres containing the staphylococcus lysozyme through supercritical fluid microparticle preparation technology, and the PLA-PLGA polymer microspheres are compounded with the calcium phosphate cement (CPC) to obtain a novel sustained release degradable antibacterial composite artificial bone carrying staphylococcus lysozyme microspheres. The preparation has good physical and chemical properties and strong sterilization effect, ensures that the in vitro medicament release process is long up to three months, has steady release rate, and can maintain steady and long-acting release at administration positions.

The invention discloses a method for preparing a thermosensitive antimicrobial film and an implant material from an antibacterial composition. The method comprises the following steps: injecting the antibacterial composition into an injector, and additionally arranging a stainless steel syringe needle; coating the implant material to be coated by adopting 10-30KV of high-voltage power supply, at 1-5mL/h of flow rate of a solution and 5-25cm of receiving distance; and finally drying the coated implant material in vacuum at room temperature for 24-48 hours, so as to obtain the thermosensitive antimicrobial film coated with the implant material, wherein the antibacterial composition comprises an organic polymer selected from polylactic acid, polycaprolactone, a polylactic acid-glycolic acid polymer and a polylactic acid-polyethylene glycol segmented copolymer, blending colloid of isopropylacrylamide and cyclodextrin or blending colloid of isopropylacrylamide and gelatin, and an antibacterial agent. The thermosensitive antimicrobial film prepared by the method can release antimicrobial medicines as long as the temperature of a human body ascends. Therefore, the method has strong pertinence.

The invention relates to the field of biological medical apparatus and instruments, and particularly relates to an absorbable intraosseous fixing device with biological activity and plasticity and a forming method. The absorbable intraosseous fixing device comprises a bone fracture plate and bone screws, wherein the bone fracture plate is provided with fixing holes and is made by a biologically absorbable high polymer material and biologically active ceramics or biologically active glass; the biologically absorbable high polymer material is 70-95% of the total weight of a composite material in parts by weight, and the biologically active ceramics or biologically active glass takes up 5-30% of the total weight of the composite material; the biologically absorbable high polymer material is selected from one or more of polylactic acid, polycaprolactone, polylactic acid-glycolic acid copolymer, polyglycolic acid, polyhydroxyalkanoate and polyhydroxybutyrate, and the molecular weight is 100,000 to 2,000,000. The absorbable intraosseous fixing device is good in biocompatibility, and can be degraded after the device is implanted in the body; meanwhile, aseptic inflammation caused in the course of material degradation can be reduced, and the pain of a patient can be alleviated; in addition, the personalized customization can be realized.

The invention relates to the technical field of medicines and discloses thymalfasin sustained-release microspheres and a preparation method thereof. The method comprises the following steps: freeze-drying and sieving an aqueous solution of thymalfasin; collecting the thymalfasin powder; grinding and sieving polylactic acid or a polylactide-co-glycolide acid (PLGA); mixing the obtained polymer powder and the thymalfasin powder to obtain a mixture of raw and accessory materials; melting and extruding the mixture of raw and accessory materials to obtain a hot-melting extrudate; cooling to cure the hot-melting extrudate; cutting, grinding and sieving to obtain the thymalfasin sustained-release microspheres. According to the invention, the thymalfasin sustained-release microspheres are prepared by a hot-melting extrusion technology without needing an organic solvent, the problem of residual organic solvent is completely avoided, a few impurities are contained, and the drug release is steady; an advantage of continuously releasing the thymalfasin dose is realized, thus the administration time is reduced, the administration pain of a patient is eased, and the thymalfasin sustained-release microspheres are suitable to be popularized and applied to treatment.

The invention discloses a neural restoration bracket. The neural restoration bracket is characterized in that the neural restoration bracket is prepared from the following raw materials in parts by weight: 25-35 parts of a vinyl modified hydroxyl terminated poly (lactic acid-glycolic acid 75/25) copolymer, 0.2-0.5 part of pearl powder, 0.1-0.3 part of amino-modified dextran modified carboxylated fullerenes, 1-4 parts of amino-modified dextran modified oxidized graphene, 0.8-2 parts of a pore-foaming agent and 3-8 parts of a decellularized neural substrate. The invention further discloses a preparation method of the neural restoration bracket. The neural restoration bracket is large in porosity, uniform in pore diameter, good in biocompatibility, excellent in antisepsis and anti-inflammation performance, excellent in mechanical performance, capable in biodegradation and assisting the neural restoration function, high in reliability and high in clinical practicability.

The invention belongs to the technical field of polymer synthetic chemistry and relates to a polyethylene glycol benzothiazole derivative with the following structural formula shown in the specification and a preparation method and application thereof. In the polyethylene glycol benzothiazole derivative, one or two 2-cyanobenzothiazole groups are contained at the terminal of polyethylene glycol. According to the invention, the N-terminal cysteine protein and polypeptide medicine can be modified by the terminal cyanobenzothiazole polyethylene glycol, and the two can efficiently conduct an irreversible coupling reaction at normal temperature in physiological conditions. Through the invention, other high molecular benzothiazole derivatives such as polylactic acid, polyglycolic acid, polylactic acid-glycolic acid copolymer and polylysine can be prepared at the same time.

The invention discloses microspheres with a tea extract and a complex wrapped and application of the microspheres in natural edible toothpaste. The microspheres with the tea extract and the complex wrapped is obtained by wrapping the tea extract and the metal ion complex with a lactic acid/glycolic acid copolymer. The invention further provides the natural edible toothpaste for children with the tea extract and the metal ion complex as main functional ingredients, the tea extract and the metal complex stably exist in the formula, and therefore the product has the quite effects of resisting bacteria, inhibiting dental plaque, preventing decayed teeth, making breath fresh, cleaning the oral cavity and making the gingiva healthy.

The invention discloses an organic polymer-based composite graphene electrode material. The organic polymer-based composite graphene electrode material is prepared by the steps of taking graphene, rare earth, polyacrylamide, polypyrrole, polystyrene, a polylactic acid-hydroxyacetic acid copolymer, polytetramethylene glycol succinate, manganese trifluoride, dimethylacetamide, and magnesium hydrate as main components, adding N-methylbutyl piperdine bis(trifluoromethyl sulfonyl)imide), pentaethylene glycol, dimethyl carbonate, N, N-dimethyl formamide, silicon dioxide, cyclohexanone, starch aluminium octenylsuccinate, a dispersing agent, a silane coupling agent and an adhesive, and performing processes of ultrasonic dispersion, stirring and banburying, mixing in an inert gas environment, spraying and drying, electrode coating with a material, and the like in auxiliary manner. The prepared organic polymer-based composite graphene electrode material is excellent in electrical conductivity, high in dielectric constant, good in charge-discharge performance, capable of satisfying industrial requirements, and relatively high in application prospect.

The present invention discloses phytoagglutinin modified lactic acid-hydroxyacetic acid copolymer with specific adhesion to prolong the retention time or preparation in gastrointestinal tract obviously and raise the bioavailability of orally taken medicine greatly. The polymer consists of biodegradable material lactic acid-hydroxyacetic acid copolymer and bioadhesive material phytoagglutinin. The phytoagglutinin modified lactic acid-hydroxyacetic acid copolymer is prepared through dissolving lactic acid-hydroxyacetic acid copolymer, 1-ethyl-3-carbodimide and N-hydroxy succinimide in non-proton type polar solvent, and reaction at room temperature via stirring for 2-12 hr; adding water, filtering and collecting precipitate to obtain PLGA-NHS; dissolving phytoagglutinin and PLGA-NHS in mixed solvent of water and non-proton type polar solvent, filtering the reacted mixture, taking the dialysate, and freeze drying to obtain the phytoagglutinin modified lactic acid-hydroxyacetic acid copolymer.

The invention provides a porous calcium phosphate support loaded microsphere composite material, as well as a preparation method and application thereof. The porous calcium phosphate support loaded microsphere composite material comprises a porous calcium phosphate support, wherein a polylactic acid-glycolic acid copolymer microsphere is loaded in each hole of the porous calcium phosphate supportand the polylactic acid-glycolic acid copolymer microsphere coats one or more antituberculosis drugs. The experiment proves that the porous calcium phosphate support loaded microsphere composite material has a filling bone remodeling and bone inducing osteogenesis function, further has an effect of locally continuously and three-dimensionally slowly releasing the antituberculosis drugs, and achieves an effect of treating osteoarticular tuberculosis and reducing recurrence. The invention further provides the preparation method and the application of the porous calcium phosphate support loaded microsphere composite material.

The invention belongs to the technical field of water-based ink, and provides water-based ink for printing a PVC decorative material and a preparation method of the water-based ink. The invention discloses water-based ink for printing a PVC decorative material. The water-based ink comprises the following components in parts by weight: 45-50 parts of water-based color paste, 15-20 parts of water-based acrylate emulsion, 20-25 parts of water-based acrylic acid modified polyurethane emulsion, 1-2 parts of water-based wax paste, 3-5 parts of a pH stabilizer, 0.9-1.5 parts of an antifoaming agent,0.5-1 part of a leveling agent, 1-2 parts of a drier and 2-5 parts of deionized water. Wherein the water-based color paste is prepared from the following components in parts by weight: 40-60 parts ofwater and 1-5 parts of additive; 10 to 20 parts of water-based acrylic resin liquid; wherein the component A is prepared from, by mass, 33-35 parts of organic pigment, 2-4 parts of wetting dispersant,0.9-1.5 parts of organic silicon defoamer and 40-45 parts of deionized water, and the drier is a mixed solution of nano yttrium oxide, butadiene triethoxysilane, polylactic acid-glycolic acid copolymer and deionized water according to the mass ratio of 1: 0.2: 3: 7. By means of the technical scheme, the problems that in the prior art, water-based ink is slow in drying, low in adhesion fastness and poor in stability are solved.

The invention discloses a hierarchical-pore-containing bioactive glass/polylactic acid-glycolic acid copolymer composite scaffold and a preparation method thereof. The hierarchical-pore-containing bioactive glass/polylactic acid-glycolic acid copolymer (PLGA) composite scaffold is prepared through the following steps that bioactive glass, camphene and polylactic acid-glycolic acid copolymer (PLGA)are added in an organic solvent 1,4-dioxane in a certain proportion in sequence, ultrasonic treatment, stirring and uniform dispersing are conduced, then the mixture is poured into a mold, freeze drying is conducted after pre-frozen forming. The scaffold is simple in preparation process, convenient to operate and stable in quality; by adding the bioactive glass, the mechanical property can be supplemented and improved, and the good biological activity and osteoinductive property are achieved; in addition, by adding camphene, can build a multistage connected hole structure similar to a naturalbone can be bionically constructed, and the scaffold has good application prospects in the fields of bone defect repair, bone tissue engineering and the like.

The invention provides a controlled-release polylactic acid-glycolic acid copolymer microsphere containing a dexamethasone transforming growth factor. A preparation method comprises the following steps: preparing a DEX/PLGA composite microsphere by a water-oil-water emulsion process; positively charging the polylactic acid-glycolic acid copolymer microsphere embedded with DEX through polyethyleneimine of which the surface is covered with positive charges, and mixing TGF-beta3 with a heparin/poly L-lysine solution to form a mixture of which the molar charge ratio is 0-3.15; and mixing TGF-beta3-embedded heparin/poly L-lysine nanoparticles with the PLGA microsphere embedded with the DEX, and covering to obtain the microsphere. The growth-promoting proliferation differentiation action of the growth factor and the anti-inflammatory action of the DEX are compounded; the inflammatory effects caused by a cell attachment carrier are reduced; the controlled-release polylactic acid-glycolic acid copolymer microsphere relatively adapts to cell attachment; the controlled-release polylactic acid-glycolic acid copolymer microsphere is nontoxic and harmless to a living body; a cell scaffold can be degraded by the living body after being treated, and can be used as a carrier for preparing a biological scaffold.