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1851 results about "Glycolic acid" patented technology
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Glycolic acid (hydroacetic acid or hydroxyacetic acid); chemical formula C₂H₄O₃ (also written as HOCH₂CO₂H), is the smallest α-hydroxy acid (AHA). This colorless, odorless, and hygroscopic crystalline solid is highly soluble in water. It is used in various skin-care products. Glycolic acid is found in some sugar-crops.
Generating Acid Downhole in Acid Fracturing
An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid-precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and / or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.
Owner:SCHLUMBERGER TECH CORP
Hemostatic sandwich bandage
The present invention relates to a haemostatic multilayer bandage that comprises preferably a thrombin layer between two fibrinogen layers. The dressing may contain other resorbable materials such as glycolic acid or lactic acid based polymers or copolymers. The inventive haemostatic bandage is useful for the treatment of wounded tissue.
Owner:AMERICAN NAT RED CROSS
Downhole tools having non-toxic degradable elements and methods of using the same
Downhole tools for use in oil and gas production which degrade into non-toxic materials, a method of making them and methods of using them. A frac ball and a bridge plug comprised of polyglycolic acid which can be used in fracking a well and then left in the well bore to predictably, quickly, and safely disintegrate into environmentally friendly products without needing to be milled out or retrieved.
Owner:NINE DOWNHOLE TECHNOLOLGIES LLC
Biodegradable injectable implants and related methods of manufacture and use
InactiveUS20030093157A1Broaden applicationSolution deliveryPharmaceutical non-active ingredientsGlycolic acidImplant
This invention is directed to the field of medical implants, and more specifically to biodegradable injectable implants and their methods of manufacture and use. The injectable implants disclosed herein comprise glycolic acid and bio-compatible / bio-absorbable polymeric particles containing a polymer of lactic acid. The particles are small enough to be injected through a needle but large enough to avoid engulfment by macrophages. The injectables of this invention may be in a pre-activated solid form or an activated form (e.g., injectable suspension or emulsion).
Owner:MEDGRAFT MICROTECH
Wound healing polymer compositions and methods for use thereof
The present invention provides bioactive polymer compositions that can be formulated to release a wound healing agent at a controlled rate by adjusting the various components of the composition. The composition can be used in an external wound dressing, as a polymer implant for delivery of the wound healing agent to an internal body site, or as a coating on the surface of an implantable surgical device to deliver wound healing agents that are covalently attached to a biocompatible, biodegradable polymer and / or embedded within a hydrogel. Methods of using the invention bioactive polymer compositions to promote natural healing of wounds, especially chronic wounds, are also provided. Examples of biodegradable copolymer polyesters useful in forming the blood-compatible, hydrophilic layer or coating include copolyester amides, copolyester urethanes, glycolide-lactide copolymers, glycolide-caprolactone copolymers, poly-3-hydroxy butyrate-valerate copolymers, and copolymers of the cyclic diester monomer, 3-(S)[(alkyloxycarbonyl)methyl]-1,4-dioxane-2,5-dione, with L-lactide. The glycolide-lactide copolymers include poly(glycolide-L-lactide) copolymers formed utilizing a monomer mole ratio of glycolic acid to L-lactic acid ranging from 5:95 to 95:5 and preferably a monomer mole ratio of glycolic acid to L-lactic acid ranging from 45:65 to 95:5. The glycolide-caprolactone copolymers include glycolide and ε-caprolactone block copolymer, e.g., Monocryl or Poliglecaprone.
Owner:MEDIVAS LLC
Biodegradable injectable implants containing glycolic acid
InactiveUS7314636B2Non-migratoryEasy to moveSolution deliveryPharmaceutical non-active ingredientsEmulsionGlycolic acid
Owner:MEDGRAFT MICROTECH
Degradable additive for viscoelastic surfactant based fluid systems
A method is given for treating a subterranean formation penetrated by a wellbore with a viscosified fluid. The fluid contains a solid hydrolysable polyacid that upon dissolution and hydrolysis releases an acid that is a breaker for the viscosifying system. Suitable solid hydrolysable polyacids include polylactic acid and polyglycolic acid. The fluid also contains a pH control agent, present in an amount sufficient to neutralize any acid present in the solid hydrolysable polyacid before the injection and to neutralize any acid generated by the solid hydrolysable polyacid during the injection, so that the acid breaker is not available to break the fluid during the injection. In one embodiment the viscosifier is a viscoelastic surfactant fluid system and the solid hydrolysable polyacid is of a size selected to be a fluid loss additive, for example in fracturing or gravel packing. In another embodiment, the solid hydrolysable polyacid is used in particles sufficiently small that they enter the pores of the formation. In either case, the viscosifier is broken after the solid releases more acid than can be neutralized by the pH control agent.
Owner:SCHLUMBERGER TECH CORP
Biodegradable polymer coils for intraluminal implants
An endovascular cellular manipulation and inflammatory response are elicited from implantation in a vascular compartment or any intraluminal location of a separable coil comprised at least in part of at least one biocompatible and absorbable polymer or protein and growth factors. Typically a catheter associated with the separable coil is used to dispose the coil into a selected body lumen. The biocompatible and absorbable polymer or protein is thrombogenic. The coil further is comprised at least in part of a growth factor or more particularly a vascular endothelial growth factor, a basic fibroblast growth factor or other growth factors. The biocompatible and absorbable polymer is in the illustrated embodiment at least one polymer selected from the group consisting of polyglycolic acid, poly~glycolic acid poly-L-lactic acid copolymers, polycaprolactive, polyhydroxybutyrate / hydroxyvalerate copolymers, poly-L-lactide. Polydioxanone, polycarbonates, and polyanhydrides. The biocompatible and absorbable protein is at least one protein selected from the group consisting of collagen, fibrinogen, fibronectin, vitronectin, laminin, and gelatin. In one embodiment the coil is composed of the biocompatible and absorbable polymer or protein with a radio-opaque material is disposed thereon. Alternatively, the coil is composed of a radio-opaque material, and the biocompatible and absorbable polymer or protein is disposed thereon. This apparatus may be positioned within intracranial aneurysms or any aneurysm in the body as well as within other body cavities.
Owner:RGT UNIV OF CALIFORNIA
Electrospun blends of natural and synthetic polymer fibers as tissue engineering scaffolds
InactiveUS20060263417A1Facilitate cell penetrationFacilitate proliferationBiocidePeptide/protein ingredientsFiberPolymer science
Non-woven fibrous scaffolds made by electrospinning from the synthetic biodegradable polymer such as, for example, poly(lactic-co-glycolic acid) (PLGA) and natural proteins, such as, for example, gelatin (denatured collagen) and elastin and a method of making thereof.
Owner:DREXEL UNIV
Biodegradable polymers for lowering intraocular pressure
InactiveUS20130071349A1Lower eye pressureSenses disorderElcosanoid active ingredientsAcetic acidMedicine
The present invention provides a method of treating glaucoma, the method comprising the step of placing a polymer in an eye of a patient, which biologically degrades over a period of time to release biodegradants, which are effective to lower the intraocular pressure of the patient, thereby treating glaucoma. Said polymer is preferably selected from the group consisting of polymers of lactic acid, glycolic acid and / or mixtures thereof. More preferably the polymer is a copolymer of lactic acid and glycolic acid, e.g. a copolymer comprising from 50 to 100% lactic acid and from 0 to 50% glycolic acid, by weight.
Owner:ALLERGAN INC
Bioabsorbable and biocompatible polyurethanes and polyamides for medical devices
ActiveUS20060188547A1Low toxicitySuture equipmentsOrganic active ingredientsAbsorbable polymersPolyester
Absorbable polyurethanes, polyamides and polyester urethanes prepared from at least one compound selected from: or the diamines and diisocyanates thereof, wherein each X represents a member independently selected from —CH2COO— (glycolic acid moiety), —CH(CH3)COO— (lactic acid moiety), —CH2CH2OCH2COO— (dioxanone), —CH2CH2CH2CH2CH2COO— (caprolactone moiety), —(CH2)yCOO— where y is one of the numbers 2, 3, 4 or 6-24 inclusive, and —(CH2CH2O)z′CH2COO— where z′ is an integer between 2 and 24, inclusive; each Y represents a member independently selected from —COCH2O— (glycolic ester moiety), —COCH(CH3)O— (lactic ester moiety), —COCH2OCH2CH2O— (dioxanone ester), —COCH2CH2CH2CH2CH2O— (caprolactone ester), —CO(CH2)mO— where m is an integer between 2, 3, 4 or 6-24 inclusive, —COCH2O(CH2CH2O)n— where n is an integer between 2 and 24, inclusive; R′ is hydrogen, benzyl or an alkyl group, the alkyl group being either straight-chained or branched; p is an integer between 1 and 4, inclusive; and Rn represents one or more members selected from H, alkoxy, benzyloxy, aldehyde, halogen, carboxylic acid and —NO2, which is attached directly to an aromatic ring or attached through an aliphatic chain. Absorbable polymers prepared from these compounds are useful for drug delivery, tissue engineering, tissue adhesives, adhesion prevention and other implantable medical devices.
Owner:BEZWADA BIOMEDICAL LLC
Imageable biopsy site marker
InactiveUS20060122503A1Accurately excise and remove a quantityMark accuratelyLuminescence/biological staining preparationOrgan movement/changes detectionRadiologyPiston
A biopsy site marker having at least one small marker body or pellet of bioresorbable material such as gelatin, collagen, polylactic acid, polyglycolic acid which has a radiopaque object, preferably with a non-biological configuration. The at least one bioresorbable body or pellet with a radiopaque object is deposited into the biopsy site, by an delivery device that includes an elongated tubular body with a piston slidable within the tubular body. One end of the tube is placed into the biopsy site. At least one but preferably several marker bodies or pellets are deposited sequentially into the biopsy site through the tube. At least the bioresorbable materials of the detectable markers remain present in sufficient quantity to permit detection and location of the biopsy site at a first time point (e.g., 2 weeks) after introduction but clear from the biopsy site or otherwise do not interfere with imaging of tissues adjacent the biopsy site at a second time point (e.g., 5-7 months) after introduction.
Owner:SENORX
Biodegradable nanocomposites with enhance mechanical properties for soft tissue
InactiveUS20070071790A1Pharmaceutical delivery mechanismPharmaceutical non-active ingredientsMechanical propertyNanocomposite
The present invention is directed to a novel poly(diol citrates)-based nanocomposite materials created using completely biodegradable and biocompatible polymers that may be used in tissue engineering. More specifically, the specification describes methods and compositions for making and using nanocomposites comprised of citric acid copolymers and polymers including but not limited to poly(L-lactic acid) (PLLA) and poly(lactic-co-glycolic acid) (PLGA).
Owner:NORTHWESTERN UNIV
Matrix compositions for controlled delivery of drug substances
InactiveUS20070042044A1Improve solubilityImprove oral bioavailabilityBiocidePowder deliveryPolyethylene oxidePEG-PLGA-PEG
A novel matrix composition for pharmaceutical use. The matrix composition has been designed so that it is especially suitable in those situation where an improved bioavailability is desired and / or in those situation where a slightly or insoluble active substance is employed. Accordingly, a controlled release pharmaceutical composition for oral use is provided in the form of a coated matrix composition, the matrix composition comprising i) a mixture of a first and a second polymer that have plasticizing properties and which have melting points or melting intervals of a temperature of at the most 200° C., the first polymer being selected from the group consisting of polyethylene glycols and polyethylene oxides, and the second polymer being selected form block copolymer of ethylene oxide and propylene oxide including poly(ethylene-glycol-b-(DL-lactic acid-co-glycolic acid)-b-ethylene glycol (PEG-PLGA PEG), poly((DL-lactic acid-co-glycolic acid)-g-ethylene glycol) (PLGA-g-PEG), poloxamers and polyethylene oxide-polypropylene oxide (PEO-PPO), ii) a therapeutically, prophylactically and / or diagnostically active substance, the matrix composition being provided with a coating having at least one opening exposing at one surface of said matrix, wherein the active substance is released with a substantially zero order release.
Owner:EGALET LTD
Acidic solution for treating surface of magnesium alloy and processing method
InactiveCN101285193AFully activatedHigh activityMetallic material coating processesGlutaric acidBinding force
The invention relates to acid solution used for processing the magnesium alloy surface. The acid solution is water solution which contains acids, inhibitor and wetting agent, wherein, the acids are first acids or mixture of first acids and second acids; the first acids are selected from one type or a plurality of types among citric acids, oxalic acids, tartaric acids, methanoic acids, acetic acids, metacetonic acids, butyric acids, glutaric acids, phenylformic acids, benzene dicarboxylic acids, lactic acids, glycolic acids, glyoxylic acids and amino acids; and the second acids are hydrochloric acids and / or nitric acids. By adoption of the acid solution, the magnesium alloy surface can be fully activated; the membranous layer of a converting film which is formed on the magnesium alloy surface after chemical conversion process is compact, has erosion resistance and good binding force with a paint film. Moreover, the method is a environment-friendly method for processing the magnesium alloy surface.
Owner:BYD CO LTD
Resorbable bone graft materials
Ceramic materials operable to repair a defect in bone of a human or animal subject comprising a porous ceramic scaffold having a bioresorbable coating, and a carrier comprising denatured demineralized bone. The ceramic may contain a material selected from the group consisting of hydroxyapatite, tricalcium phosphate, calcium phosphates, calcium carbonates, calcium sulfates, and combinations thereof. The compositions may also contain a bone material selected from the group consisting of: bone powder, bone chips, bone shavings, and combinations thereof. The bioresorbable coating may be, for example, demineralized bone matrix, gelatin, collagen, hyaluronic acid, chitosan, polyglycolic acid, polylactic acid, polypropylenefumarate, polyethylene glycol, or mixtures thereof.
Owner:BIOMET MFG CORP
Downhole tools having non-toxic degradable elements
Downhole tools for use in oil and gas production which degrade into non-toxic materials, a method of making them and methods of using them. A frac ball and a bridge plug comprised of polyglycolic acid which can be used in fracking a well and then left in the well bore to predictably, quickly, and safely disintegrate into environmentally friendly products without needing to be milled out or retrieved.
Owner:NINE DOWNHOLE TECHNOLOLGIES LLC
Methods of making functional biodegradable polymers
There is provided a method to modify biodegradable polymers using the direct reaction of a biodegradable polymer in a vinyl monomer and may take place in the presence of initiators. The initiator may be free radical initiators, heat, ionic initiators, UV irradiation, ionizing irradiation and other high energy irradiation. Suitable biodegradable polymer include polycaprolactone, poly(lactic acid), poly(glycolic acid) and poly(lactic-co-glycolic acid). Suitable vinyl monomers include acrylates, methacrylates and the like.
Owner:KIMBERLY-CLARK WORLDWIDE INC
Marker or filler forming fluid
ActiveUS7877133B2Easy to detectEasy to distinguishCosmetic preparationsImpression capsWater insolubleGlycolic acid
Owner:SENORX
Glycolic acid copolymer and method for production thereof
Owner:ASAHI KASEI CHEM CORP
Lubricating composition containing an antiwear agent
The invention provides a lubricating composition containing an oil of lubricating viscosity and a compound obtained / obtainable by a process comprising reacting a glycolic acid, a 2-halo-acetic acid, or a lactic acid, or an alkali or alkaline metal salts thereof, (typically glycolic acid or a 2-halo-acetic acid) with at least one member selected from the group consisting of an amine, an alcohol, and an aminoalcohol. The invention further relates to the use of the lubricating composition in an internal combustion engine.
Owner:THE LUBRIZOL CORP
Photosensitizer composition for treating skin disorders
A composition comprising an active ingredient selected from the group of 5-aminolevulinic acid or a pharmaceutically acceptable salt or derivative thereof; and an aqueous carrier comprising at least one absorption enhancer, an anesthetic, hyaluronic acid and at least one acid selected from the group consisting of glycolic acid and lactic acid. The composition is useful in a photodynamic method of treating skin disorders.
Owner:MODI PANKAJ
Polyethylene glycol-poly(lactic-co-glycolic acid)-polylysine nano-delivery system, preparation method and application thereof
ActiveCN101732723AEffective targeted deliveryPowder deliveryGenetic material ingredientsTumor targetingPolyethylene glycol
The invention belongs to the nanotechnical field, and discloses preparation of a methoxy polyethylene glycol-poly(lactic-co-glycolic acid)-polylysine(mPEG-PLGA-PLL) cationic polymer nano-drug delivery system and application thereof. The nano-drug delivery system can have multi-functional characteristics such as tumor targeting, reversing drug resistance and medical diagnosis functions through modification, and can be used for supporting organic medicaments, water-soluble medicaments, non-water-soluble medicaments, or developers for diagnosis. The preparation method is simple and convenient, is suitable for mass production, and is particularly suitable for the preparation of targeting drug delivery systems.
Owner:森心(上海)科技有限公司
Balloon catheter comprising pressure sensitive microparticles
InactiveUS20120083734A1Improve brittlenessEffective treatmentSurgeryDilatorsPolyesterPoly(N-isopropylacrylamide)
The invention provides a solution to the above mentioned problem in that it provides a catheter balloon comprising a flexible coating on its outer surface wherein a plurality of microparticles are contained wherein said coating comprises a material selected from the group consisting of poly(N-vinyl-pirrolidone, poly(N-vinyl-pirrolidone-co-butylacrylate), poly(-vinyl pyridine), polyacrylamides, e.g. poly(N-isopropylacrylamide), poly(amido-amines), poly(ethylene imine), poly(ethylene oxide-block-propylene oxide), poly(ethylene oxide-block-propylene oxide-block-ethylene oxide), poly(styrene-block-isobutylene-block-styrene), poly(hydroxystyrene-block-isobutylene-block-hydroxystyrene), polydialkylsiloxanes, polysaccharides, polyacrylates and polyalkylmethacrylates, e.g. polymethylmethacrylate and poly(2-hydroxyethylmethacrylate) and wherein said microparticles comprise a material selected from the group consisting of polyesters, e.g. poly(lactic acid), poly(lactic-co-glycol acid), poly(glycolic acid), poly(3-hydroxybutyrate), poly(3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and polycaprolactone, polyamides, polysaccharides, polyurethanes, polyalkylmethacrylates and polyacrylates, e.g. polymethylmethacrylate and poly(2-hydroxyethylmethacrylate) and wherein the microparticles comprise a pharmaceutically active compound.
Owner:ENCAPSON
Bioabsorbable polymer containing 2-hydroxyacid monomers
Genetically engineered organisms for production of PHA copolymers containing 2-hydroxyacid monomers and the methods of making and using thereof have been developed. The copolymers containing 2-hydroxyacid monomers can be synthesized via biosynthesis by the action of a PHA polymerase in a living cell. By changing the genetic background of the cells, one can control specific metabolic pathways allowing control of the level of glycolic acid co-monomer in the PHA polymer.
Owner:CJ CHEILJEDANG CORP +1
Nano-calcium phosphates/collagen based bone substitute materials
InactiveUS6887488B2Improve performanceExcellent bioactivityBiocideBone implantCalcium biphosphateNatural bone
The present invention relates to a nano-calcium phosphates / collagen composite that mimics the natural bone, both in composition and microstructure, as well as porous bone substitute and tissue engineering scaffolds made by a complex of said composite and poly(lactic acid)(PLA) or poly(lactic acid-co-glycolic acid)(PLGA). The invention also relates to the use of said scaffold in treating bone defect and bone fracture.
Owner:TSINGHUA UNIV
Biodegradable fluorourcacil polyester medicine-carried nanospheres and its preparation method
InactiveCN101053553AHigh drug loadingSmall particle sizeOrganic active ingredientsPowder deliveryPolyesterPolymer science
The invention relates to biodegradable fluorouracil(Fu) polyester drug-bearing manoparticles with a coating material of polylactic acid, polylactic acid-glycolic acid, polylactic acid-polyethylene glycol block copolymer or polylactic acid-glycolic acid-polyethylene glycol block copolymer and the producing method including: firstly, fully dissolving the copolymer in the dichloromethane, under the ultrasonic shock, injecting the fluorouracil NaOH solution in the dichloromethane solution, dispersing uniformly, forming W / O primary latex, and beating up the primary latex and injecting into the fluorouracil saturated water solution containing 5 wt% of polyvinylalcohol (PVA), and storing in the refrigeratory after freeze-dry. The drug-bearing manoparticle has a drug content which is 10-25% of the microparticle mass, and has a smooth surface, an even diameter distribution, a remarkable slow release function and not adhesive. The micropartical size is 100-1000nm.
Owner:JILIN UNIV +1
Glycolic acid copolymer and method for production thereof
A glycolic acid copolymer comprising (a) 80 to less than 95% by mole of glycolic acid monomer units, (b) 5.0 to 20.0% by mole of non-glycolic, hydroxycarboxylic acid monomer units, and (c) 0 to 0.10% by mole of diglycolic acid monomer units, the non-glycolic, hydroxycarboxylic acid monomer units (b) constituting a plurality of segments each independently consisting of at least one monomer unit (b), wherein the segments have an average chain length of from 1.00 to 1.50 in terms of the average number of monomer unit or units (b), the total of the components (a), (b) and (c) being 100% by mole, the glycolic acid copolymer having a weight average molecular weight of 50,000 or more.
Owner:ASAHI KASEI CHEM CORP
PLA/PLGA shell-core microballoons prepared by oil in water-solid in oil method, and preparation method thereof
InactiveCN101461786ASmooth and rounded surfaceDisadvantages of Avoiding PollutionPharmaceutical non-active ingredientsGranular deliveryControlled releaseAcetic acid
The invention relates to a PLA / PLGA shell-core microsphere prepared by solid-in-oil-in-water in the technical field of pharmacy and a preparation method thereof. The microsphere comprises 0.01 to 50 percent of medicine, 20 to 99.99 percent of polylactic acid and / or polylactic acid-glycolic acid, or / and 0 to 30 percent of pharmaceutical excipient (weight percentage). The method comprises the steps of: adding medicine particles into a PLA and / or PLGA organic solution to be emulsified, then selecting a hydrophilic organic solvent to re-emulsify to form unhardened balls, finally hardening in another large oil phase, removing the organic solvent and collecting micropheres. The method overcomes the disadvantages of low envelope rate of the prior W / O and W / O / W, serious burst release of S / O / O, and environmental pollution, controls the grain diameter of the microsphere according to the need, does not pollute the environment, and can be applied to the preparation of slow release or controlled release microspheres of various medicines and adjuvants of vaccines.
Owner:SHANGHAI JIAO TONG UNIV
Matrix compositions for controlled delivery of drug substances
InactiveUS20100166866A1Improve solubilityImprove oral bioavailabilityPowder deliveryBiocidePolyethylene oxidePEG-PLGA-PEG
Owner:EGALET LTD
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