118results about How to "Stable drug release" patented technology

The invention discloses a soluble coaxial-cone multi-layer microneedle. The microneedle is in a cone shape; an internal structure of the microneedle comprises a cone-shaped or conical-cylinder-shaped center layer, and one or more outer layers wrapping the center layer; the center layer and the outer layers are prepared by active drugs and/or structural materials; and a mass ratio of the active drugs to the structural materials is (10:1)-(1:100). The multi-layer structure of the microneedle can be dissolved layer by layer and step by step during intracutaneous contact and body fluid contact, so that the drug release time of one or more drugs and a procedure of drug release dosage can be controlled, and the microneedle can be used for partial skin treatment or whole body administration.

The invention provides a core-shell type pre-charged chemotherapy medicine embolization microsphere and a preparation method thereof. The method comprises the following steps of using water/oil/water(W/O/W) complex emulsion type or oil/water/oil (O/W/O) complex emulsion type emulsified micro liquid drips as templates; coating tiny liquid drips containing medicine into outer layer liquid drips; high molecular polymers in the inner and outer layer liquid drips are converted through measures such as physical measures and chemical measures to form an inner layer core and an outer layer shell. Theformed core-shell structure medicine microsphere is formed by polymers of two-layer structures; the inner core contains medicine; the outer shell is favorable for maintaining the activity of the inner core medicine; the stable medicine release is realized; the sudden release is prevented; the safety is enhanced. The medicine carried microsphere prepared by the method has the advantages that the particle diameter range is 10 to 1000 micrometers; the sphere degree is good; the particle diameter is uniform; (the dimension deviation is 5 percent); the medicine encapsulation rate is high; the structure/carried medicine is controllable; meanwhile, the preparation method of the pre-charged chemotherapy medicine embolization microsphere can provide a novel idea for the clinic application study ofthe transcatheter arterial embolization.

The invention discloses a metoprolol succinate sustained-release capsule, consisting of a capsule shell and contents; the contents comprise a metoprolol succinate sustained-release pellet; the metoprolol succinate sustained-release pellet comprises a metoprolol succinate contained pill core and a sustained-release coating layer coated outside the metoprolol succinate contained pill core; the metoprolol succinate contained pill core is prepared by using metoprolol succinate as the active ingredient and mixing with an auxiliary material, wherein the weight ratio of the metoprolol succinate to the auxiliary material is 1:1.5 to 1:3. The metoprolol succinate sustained-release medicine disclosed by the invention is stable and the expected effects of all release behaviors in acid, alkaline and water can be achieved. The invention further discloses a method for preparing the metoprolol succinate sustained-release capsule; compared with the prior art, the process is simpler and has good operability and reproducibility.

The invention discloses pantoprazole and the sodium salt enteric sustained-release micropill preparation thereof. The preparation comprises pantoprazole-containing micropills, an isolation layer, a sustained-release layer, another isolation layer and an enteric layer from inside to outside in sequence; the weight of the first isolation layer is 0.5% to 40% of that of the pantoprazole-containing micropills, the weight of the sustained-release layer is 5% to 100% of that of the pantoprazole-containing micropills, the weight of the second isolation layer is 0.5% to 40% of that of the pantoprazole-containing micropills, and the weight of the enteric layer is 20% to 200% of that of the pantoprazole-containing micropills. The pantoprazole enteric sustained-release micropills can stably release the drug.

The invention relates to a levetiracetam slow release medicinal composite and a preparation method thereof. The tablet core of the medicinal composite is mainly composed by 55-65% of levetiracetam in weight percentage and 35-45% of non hydrophilia auxiliary material with the slow release function in weight percentage, the non hydrophilia auxiliary material with the slow release function is mixed by one, two or three of ethyl cellulose, methyl cellulose or behenic acid glyceride, and the slow release medicinal composite does not need a functional controlled release coating to adjust the drug release. The levetiracetam medicinal composite has stable drug release performance, good biocompatibility and dissolution performance; and the preparation technology is simple, is easy to reproduce, and is applicable to industrialization production.

The present invention relates to a gel plaster for sleep disorder and its preparation mehtod thereof, composed of 2% -100% of extract of traditional Chinese medicine and 98% -0% of medicinal adjuvant, wherein the extracts of the lily, tuckahoe are the water-soluble extracts using water extraction method and the extracts of spiny jujube seed, polygala root are fat-soluble extracts using alcohol extraction method. The traditional Chinese medicine plaster is prepared by mixing the molecule gel with the hydrogel and the water-soluble medicine enters into the skin through a water-based channel and the fat-soluble medicine enters into the skin by a fat-soluble channel, thus the production technique prevents the separation of medicine and matrix, at the same time a certain repulsion force of oil-based matrix to the water-based medicine and a certain repulsion force of water-based matrix to the oil-based medicine can promote the medicine absorption and the medicine efficacy is increased.

The present invention relates to one kind of biodegradable medicine-carrying polyglycolide-lactide microsphere in star structure and its preparation process. The biodegradable medicine-carrying polyglycolide-lactide microsphere has coating material of star polyglycolide-lactide, coated protein polypeptide medicine of bovine serum albumin or leuteinizing hormone-releasing homone (LH-RH) analog, medicine carrying amount of 17.56-67.51 mcg/mg microsphere and embedding rate of 28.68-78.39 wt%. It is prepared through a W/O/W composite emulsifying process to coat protein polypeptide medicine into star polyglycolide-lactide to form microsphere. Compared with linear medicine-carrying polyglycolide-lactide microsphere, the present invention has obviously increased medicine carrying amount and embedding rate and obvious long-acting and slowly releasing effect.

The invention provides an oral ciclosporin A sustained-release agent. The sustained-release agent comprises the following components in part by mass: 1 part of ciclosporin A, 2.5 to 7.5 parts of polyvidone-K30, 0.15 to 4.82 parts of hydroxypropyl methyl cellulose 4000cPa.s, 0.1 to 3.94 parts of microcrystalline cellulose, 0 to 2.57 parts of hydroxypropyl methyl cellulose 15000cPa.s and 0.1 to 1.0part of phospholipid. By combining a solid dispersing technology and a sustained-release hydrophilic gel matrix technology and based on the 'double release' principle of fast release first and slow release second, the method prepares the insoluble medicament of ciclosporin A sustained-release agent; and the method has the obvious advantages that the solubility of ciclosporin A is improved, and the oral agent can quickly play the effect first and then smoothly and slowly release drug. The ciclosporin A sustained-release tablets reduce the lowered blood concentration peak-valley phenomenon and lower the drug-taking frequency. The invention also discloses a method for preparing the oral ciclosporin A sustained-release agent.

The present invention discloses a gel patch for treating motion sickness and a preparing method thereof. The patch of the invention is composed of a back lining layer, an adhesive layer and a protecting layer. The invention is characterized in that the adhesive layer in the patch is mainly composed by mixing Chinese medicinal herbs, molecular gel, hydrogel and bleeding promoting agent. The composition and weight parts of Chinese medicinal herbs are as follows: 1-50 parts of fresh ginger, 1-25 parts of orange peel, 1-25 parts of agastache rugosa and 1-25 parts of bornyl alcohol. The weight part of each component in the adhesive layer is as follows: 1-30 parts of Chinese medicinal herb extract, 50-200 parts of molecular gel, 100-500 parts of hydrogel and 1-20 parts of bleeding promoting agent. The gel patch of the invention has the advantages of remarkable preventing and treating effect to motion sickness, little side effect, smooth medicine releasing, small excitation to skin, easy carrying, and convenience for the using of patients suffering from motion sickness.

The invention provides a method for preparing isradipine controlled-release tablets. The isradipine controlled-release tablets comprise a double-layer tablet core composed of a medicament-containing layer and a promoting layer, a semi-permeable membrane, a drug-releasing small hole and a moistureproof coating layer, wherein the medicament-containing layer comprises active ingredients as isradipine and pharmaceutically acceptable excipients; the promoting layer at least comprises macromolecular osmoactive substances, water-insoluble polymer, penetration enhancer, colouring agent and others; and the semi-permeable membrane is composed of a film-forming material, a plasticizer and a porogenic agent.

The invention discloses an ambroxol hydrochloride sustained-release dry suspension, which is prepared from the following components in percentage by weight: 20 to 60 percent of sustained-release micro-pills, 39.9 to 79.5 percent of suspending aid and 0.1 to 0.5 percent of flavoring agent, wherein the sustained-release micro-pills are prepared by wrapping a sustained-release coating layer outside medicine-carrying pill cores, and the medicine-carrying pill cores comprise 10 to 30 weight percent of ambroxol hydrochloride and 70 to 90 weight percent of pharmaceutic adjuvant. The ambroxol hydrochloride sustained-release dry suspension can be released continuously for 24 hours, can be taken by adding proper amount of warm water, is particularly suitable for treating phlegm eliminating treatment of acute and chronic respiratory tract diseases in olds, children and people who have difficulty in swallowing, and can increase the compliance of administration of patients. The invention also discloses a preparation method for the ambroxol hydrochloride sustained-release dry suspension.

The invention relates to a preparation method of melbinum osmotic pump controlled release tablets for treating type 2 diabetes. The preparation method comprises the steps of preparing tablet cores, coating semi-permeable membrane layers, perforating, drying and coating damp-proof layers, characterized in that when the tablet cores are prepared, a medicinal salt of melbinum and a nonionic surfactant are added, and the nonionic surfactant accounts for 2-20wt.% of the medicinal salt of melbinum. The medicament disclosed by the invention has stable release, no irritation on intestinal tracts and few times of administration, is acceptable by patients, and greatly improves the compliance of patients.

The invention provides a nifedipine double-layer osmotic pump medicinal composition and a preparation technology thereof. The composition comprises a double-layer tablet core and a controlled release coating membrane thereof, wherein the double-layer tablet core is composed of pharmaceutically acceptable excipients and comprises one or more than one of a macromolecular suspending aid substance, an osmotic pressure active substance, a permeation enhancer, a dissolving aid substance, a colorant, a macromolecule swelling substance, a lubricant, a flow aid, an adhesive and a solvent; and the controlled release coating membrane is composed of one or more than one of a membrane forming material, a pore-forming agent and a plasticizer. The nifedipine double-layer osmotic pump medicinal composition prepared by the invention can effectively control a medicament to release in a specific time so that the medicament taking time can be decreased.

The invention relates to a micro-pill preparation and its producing craft, especially the Gushukang micro-pill and its producing craft. The Gushukang micro-pill is produced according to following weight shares: longspur epimedium 100-1000; ripe radix rehmanniae 200-400; drynaria 60-660; astragalus root 130-1400; radix salviae miltiorrhizae 60-660; dried edible fungus 50-530; cucumber-seed 50-530. The invention has a good resolvability, a smart curative effect, a stable medicine releasing, a high bio-availability, a small local thrill, a beautiful pill appearance, a small moisture absorption, and a good feeling for patients, further it is easy to transport, store and carry.

The present invention is heart-benefiting Yixinshu micropill and its preparation process. The heart-benefiting Yixinshu micropill is prepared with ginseng 100-500 weight portions, ophiopogon root 100-500weight portions, schisandra 100-300weight portions, astragalus root 150-450weight portions, red sage 200-600weight portions, Chuanxiong rhizome 100-300weight portions, haw 200-400weight portions, avicel 300-500weight portions, and mannitol 50-200weight portions. It has diameter smaller than 0.05mm, excellent disintegrating and dissolving performance, fast acting, high bioavailability, and other advantages, and possesses functions of promoting blood circulation to disperse blood clots, benefiting qi, nourishing yin, etc.

The invention belongs to the field of biomedical science, and particularly relates to a preparation method of injectable self-curing hypoglycemic hydrogel. The preparation method is characterized in that dextran (Dex) and polyethylene glycol (PEG) are used as main raw materials and are subjected to chemical modification so as to obtain derivatives of the dextran and the polyethylene glycol, namely the furyl dextran derivative (DF) and the maleimide polyethylene glycol (Mal-PEG-Mal) derivative, the self-curing hydrogel material controlled in gelling time can be obtained through Diels-Alder reaction, and a hypoglycemic medicament comprising one or more of sulfonylureas, biguanides, insulin and the like is loaded on the hydrogel material. The purpose of stably controlling blood sugar for a long time is achieved by slowly releasing the hypoglycemic medicament, the morbidity of diabetic complications is reduced, and even the life span of patients is prolonged.

The invention relates to an ophthalmic gel containing chondroitin sulfate and a method for preparing the same. The ophthalmic gel comprises chondroitin sulfate and taurine in effective dose and an aqueous gel substrate in proper amount. Compared with eyedrop, the ophthalmic gel has the advantages of good biocompatibility, small stimulation, simple preparation process and the like.

The invention discloses a preparation method of a paliperidone sustained release microsphere injection. The preparation technology comprises the following steps: (1) paliperidone and an acid anhydrides reagent are respectively dissolved in a solvent to be subjected to esterification reaction under the effect of an alkaline catalyst; (2) the esterification product obtained in the step (1) is dissolved in anhydrous dichloromethane to be subjected to acylation reaction with the added acylation reagent with DMF (N, N- dimethylformamide) being the catalyst; (3) the acylated paliperidone is subjected to esterification reaction with polylactic acid (PLA) through chemical bond bonding; (4) paliperidone sustained release microspheres are prepared by adopting solvent evaporation method, and the paliperidone sustained release microspheres are prepared into the microsphere injection after being cooled and dried. The preparation method is safe to operate, mild in reaction condition and simple and clear in steps; the total yield reaches 50% or above; the particle sizes of the obtained paliperidone microspheres are 30-50 micron; the paliperidone sustained release microsphere injection provided by the invention is high in drug loading capacity, stable in drug release, long in drug release time and good in sustained release effect.

The invention relates to new application of biguanide drugs, in particular to application of biguanide drugs in preparation of drugs for preventing or weakening pulmonary fibrosis. The pulmonary fibrosis is complications produced by EGFR-TKI or ALK-TKI in treatment of non-small cell lung cancers. The biguanide drugs can avoid the complications produced by the EGFR-TKI or ALK-TKI in treatment of non-small cell lung cancers, effectively improve an EGFR-TKI or ALK-TKI treatment effect and reduce occurrence and development of patients' complications.

The invention relates to mifepristone shell-type vaginal ring preparation and application. A miferprisone shell-type vaginal ring comprises, by weight, 1.0-6.0% of mifepristone, 0.5-3.0% of medicine dispersion carriers, 0.3-2.0% of additives and 89.0-98.2% of medical polymer controlled release materials. Firstly, a solid dispersion technology is adopted for improving the solubility in water and release degree in vitro of the mifepristone, then a method of mold pressing vulcanization forming is adopted for preparing the mifepristone shell-type vaginal ring, the inner layer is a vacancy silicon rubber skeleton layer, the middle is a medicated layer, and the outmost layer is a controlled release film. By the implementation of the mifepristone shell-type vaginal ring preparation and application, the vaginal ring can release the mifepristone within 21 days at almost constant speed slowly and continuously for a long time, so that the medicine can be released more stably, the first-pass effect and gastrointestinal reaction caused by oral medication of the mifepriston are avoided, and the biological availability of the medicine and medication compliance of a patient are improved. The vaginal ring can be used for routine contraception and treating gynecological diseases such as the endometriosis and the uterine fibroid.

The invention discloses a nifedipine slow release tablet. The nifedipine slow release tablet is formed through uniformly mixing and tabletting medicine-carrying particles and pharmaceutically acceptable auxiliary materials. The method for preparing the medicine-carrying particles comprises the following steps of: dissolving nifedipine and povidone in ethanol, evaporating an obtained mixed solution till the mixed solution becomes viscous, adding the viscous mixed solution into into docosanoic acid glyceride meltwater, fully stirring, cooling, smashing and sieving. The nifedipine slow release tablet provided by the invention improves the solubility of the nifedipine, well controls the release of the nifedipine, the process is simple, and the nifedipine slow release tablet is suitable for requirements of large-scale production.

The invention relates to a gel plaster for treating myopia and its preparation method, composed of 2% -100% of extract of traditional Chinese medicine and 98% -0% of medicinal adjuvant, wherein the extracts of ginkgo leaf and chrysanthemum are extracted using alcohol extraction method; the water-based extract of bilberry fruit is extracted using water extraction and alcohol precipitation method. The traditional Chinese medicine plaster is prepared by mixing the molecule gel with the hydrogel and the water-soluble medicine enters into the skin through a water-based channel and the fat-soluble medicine enters into the skin by a fat-soluble channel, thus the production technique prevents the separation of medicine and matrix, at the same time a certain repulsion force of oil-based matrix to the water-based medicine and a certain repulsion force of water-based matrix to the oil-based medicine can promote the medicine absorption and the medicine efficacy is increased.