CN100381183C - Method for preparing digestive tract stent carried with medicines of micro-/nanometer balls - Google Patents
Method for preparing digestive tract stent carried with medicines of micro-/nanometer balls Download PDFInfo
- Publication number
- CN100381183C CN100381183C CNB2005100304440A CN200510030444A CN100381183C CN 100381183 C CN100381183 C CN 100381183C CN B2005100304440 A CNB2005100304440 A CN B2005100304440A CN 200510030444 A CN200510030444 A CN 200510030444A CN 100381183 C CN100381183 C CN 100381183C
- Authority
- CN
- China
- Prior art keywords
- micro
- preparation
- medicine
- nano ball
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The present invention relates to a method for preparing digestive tract stents carried with medicines of micro-/nanometer balls, which belongs to the technical field of medicine and medical appliance. The present invention comprises the following steps: 1. preparing microballs carried with medicines: microballs can ba prepared by the following methods: (1) a thermosetting method, (2) a solidification method by adding crosslinking agents, (3) a volatilizing dissolvant polymerization method, (4) irradiating polymerization method; 2. prepareing nanometer balls carried with medicines: nanometer balls can be prepared respectively by the following method: (1) an emulsion polymerization method, (2) a natural macromolecule polymerization method, (3) a liquid drying method, (4) an automatic emulsion method; 3. preparing micro-/nanometer balls storing layers; 4. preparing back lining layers; 5. preparing protective film layers. Stents prepared by the present invention are used for treating benign and malignant stricture of the esophagus and other digestive tracts, and have not only the function of mechanical dilatation, but also the function of local treatment. The micro-/nanometer balls storing layers directly release medicines to tumor organizations or other pathological change organizations, and solve obstruction due to benign stricture for a long time for treating the benign stricture of the digestive tract for a long time.
Description
Technical field
What the present invention relates to is the preparation method of a kind of medicine and technical field of medical instruments, specifically, is a kind of preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent.
Background technology
Digestive tract is good, malignant stricture is common clinically disease.Wherein, digestive tract malignant stricture digestive tract cancer patient's disease occurred frequently especially.Except surgical resection, radiation and chemotherapy method, interventional therapy means commonly used mainly contain balloon expandable (mainly for benign stricture) and support is inserted.For middle and advanced stage digestive tract cancer patient, it is considerable palliative treatment means that support is inserted, and can effectively improve middle and advanced stage digestive tract cancer patient's quality of life, prolongs life span.But still there are following 2 deficiencies at least in conventional metals support and overlay film frame: 1. do not possess real local therapeutic effects, only play the effect of appeasing that mechanical support one short-term subtracts disease, and powerless to the generation that prevents the restenosis due to the tumor growth; Though overlay film frame can prevent the interior growth of tumor more to a certain extent, but still can not prevent the vertical undue growth and the repressive restenosis of tumor.2. metal rack still need cooperate the whole body drug treatment after implanting, but the cancerous tissue blood drug level after the whole body administration is low, is difficult to reach effective treatment concentration; If want to reach therapeutic effect, long term administration treatment that just must be heavy dose of, but most cancer therapy drug toxic and side effects is very big, organ lesion or the extremely weak middle and terminal cancer patient of body constitution have occurred for majority, is worthless.Be head it off, can reach topical treatment, reduce the purpose of toxic and side effects by medicine is carried on the support in every way.
Find through literature search prior art, Chinese patent publication number CN1159071C, open day is on July 28th, 2004, patent name: the preparation method of biodegradable medicine composite macromolecular scaffold material, this patent readme is: " polyphosphazene polymer lactic acid, polycaprolactone and anti-restenosis medicaments are dissolved in the solvent; The solution of preparation is poured in the container, and film forming is made filament; Filament dipped in the mixed solution by L-lactic acid and glycolide copolymer, solvent and the preparation of anti-restenosis medicaments dry, or lyophilization; In anticoagulation solution, soak then, dry; Filament is wound on the mould, and thermoset forming is macromolecular scaffold material.Described solvent is chloroform, 1,4 dioxane and dimethyl sulfoxide.Described anti-restenosis medicaments is paclitaxel, taxotere, aryltretinoin ethylester, probucol, dexamethasone, sirolimus.Described anticoagulation solution is by carboxylated Sulfation chitosan aqueous solution or heparin sodium aqueous solution and the miscible preparation of acetone." if this patent is used to prepare the digestive tract intraluminal stent then mainly has the following disadvantages: the one, degradable macromolecular material mechanical property shortcoming, intensity, elasticity do not reach the requirement of alimentary stent.Particularly the digestive tract tube chamber has the characteristic of shrinking and wriggling.The 2nd, this preparation method gained drug stent there is no protective layer, and the physical and mechanical properties of degradable high polymer material institute existence, and these are difficult to make, and support is complete is delivered at diseased region.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent is provided.Make the carried medicine sustained-release micro-/ nano ball alimentary stent of its preparation be used for the treatment of esophagus and other gastral benign and malignant stenosis, not only has the mechanicalness dilating effect, and has a local therapeutic effects, micro-/ nano ball storage layer will directly discharge medicine in tumor tissues or other pathological tissues, the digestive tract benign and malignant stenosis is treated, solve blocking that benign and malignant stenosis causes muchly.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
(1) preparation of medicine carrying microballoons:
Medicine carrying microballoons can adopt following four kinds of methods preparation respectively:
1. the genealogy of law is heating and curing: the character of utilizing protein to meet thermal denaturation prepares microsphere.
The described genealogy of law that is heating and curing, specific as follows: by mass ratio is to get bovine serum albumin and 5-fluorouracil at 10: 1, the Oleum Gossypii semen that contains 10%Span with 100ml mixes, speed with 2500rpm stirs 10min, ultrasonic emulsification, other gets Oleum Gossypii semen 100ml and is heated to 180 ℃, under same mixing speed, add above-mentioned emulsion gradually, 180 ℃ of insulation 10min continue to be stirred to room temperature, add diethyl ether or petroleum ether 200ml defat, speed with 3000rpm is centrifugal, discard oil phase, precipitation is used ether, ethanol rinsing successively, makes the 5-fluorouracil microsphere.
2. add the cross-linking agent solidification method:
This law can specifically be divided into two kinds of methods again.
Method one: medicine is scattered in the solution of carrier material, adds cross-linking agent (catalyst) and be solidified into gel, be dispersed into microparticulate system.
The described method one that adds in the cross-linking agent solidification method, concrete steps are as follows: preparation ametycin microsphere, get ametycin and Algin by 1: 100 mass ratio, earlier Algin is dissolved into the homogeneous thick liquid with distilled water in 80 ℃, concentration is 6%, add ametycin and an amount of mixing of 0.1 calcium chloride solution more successively, this mixed liquor forms cross-linked network structure and generates gel under acid, high volence metal ion and other bi-functional cross-linking agent effect, reprocessing is shredded into the microsphere that mean diameter is 600um.
Method two: medicine is dispersed in the carrier material solution, is emulsified into w/o type emulsion (water in oil type emulsion), add cross-linking agent (catalyst) again and make the oil-water interfaces of microdroplet be cross-linked into solid particle, washing promptly.
The described method two that adds in the cross-linking agent solidification method, concrete steps are as follows: methotrexate/PVA is distributed in the 10ml aqueous solution with mass ratio at 1: 5, be added under rotating speed 900rpm stirs and contain in the 2.5% emulsifying agent oil solution, water wherein: oil=1: 3, continue to stir, emulsifying gets w/o type emulsion, adds cross-linking agent and makes emulsion droplet oil-water interfaces crosslinking curing, separate, washing promptly gets microsphere.
3. the solvent polymerization of volatilizing: medicine and substrate are scattered in the organic solvent, in the time of stirring, dropwise are added in the aqueous solution of polymer, obtain O/W type emulsion (oil-in-water emulsions), fling to organic solvent, washing, dry microsphere.
Described volatilization solvent aggregation method, its method is specific as follows: cisplatin is distributed in the dichloromethane solution of poly-L-propionic ester, the mass ratio of cisplatin and poly-L-propionic ester is 2: 7, with contain 0.05% methylcellulose and 4% polyvinyl alcohol mixing water solution mixes, ultrasonic breast is spared into O/W type emulsion, behind the steaming vibrating dichloromethane promptly.
4. shine polymerization: the monomer solution of polymer is brought out polyreaction with r ray or ultraviolet radiation, disperse to such an extent that microparticulate is, methyl methacrylate is dissolved in the 5-fluorouracil suspension, and reuse Co r-roentgenization obtains the microsphere of methyl methacrylate polymerization embedding medicinal.
Described irradiation polymerization, specific as follows: methyl methacrylate is dissolved in the 5-fluorouracil suspension, and described suspension, the mass ratio of its methyl methacrylate and 5-fluorouracil are 6: 1, reuse 5 * 10
-5The Co r-roentgenization of Gy.
(2) preparation of medicine-carried nanospheres
Medicine-carried nanospheres can adopt following four kinds of methods preparation respectively:
1. emulsion polymerization method: in proportion 1: 15[W (mg)/V (ml)] take by weighing 5-fluorouracil and 0.1mol/l dissolve with hydrochloric acid solution after, add pluonicF68 solution and stabilizing agent, after regulating pH value, under agitation drip the monomeric organic solvent of cyano-containing Isobutyl 2-propenoate, stirred 3 hours, and added anhydrous sodium sulfate, continue again to stir 1 hour, filter with sintered glass funnel, promptly.
Described stabilizing agent metal surface activating agent is as Tween 80.
2. natural polymer coacervation: take by weighing amycin and gelatin by 10: 1 (W/W), emulsifying in the 3ml Oleum sesami is cooled off the reuse acetone diluted with the emulsion that forms in ice bath, filter membrane with the 50nm aperture filters, discard big microsphere,, add the acetone soln 30ml of 10% formaldehyde with the oil on the acetone flush away nanosphere, nanosphere was solidified 10 minutes, acetone is washed, air drying, promptly.
3. intra-liquid desiccation method: medicine and polymer are dissolved in chloroform, in 15 ℃, 0.5% aqueous gelatin solution, can make w/o type emulsion in 45 minutes with ultrasonic emulsification, reheat to 40 ℃, and continue under supersound process, to make solvent evaporation, centrifugal, washing, lyophilizing, the nanosphere of particle diameter 500nm.
4. automatic emulsified method: with DL-poly (lactide-co-glycolide) and medicine (10: 1, W/W) be suspended among the water 1.5ml of 0.2um membrane filtration, add mixed solvent (acetone: dichloromethane=30: 1), pour in the 50mlPVA aqueous solution (20g/L), acetone diffuses into water rapidly, forms the emulsion droplet (automatic emulsified) of nano-scale.Through 3-4 hour, dichloromethane volatilized from solvent, and emulsion droplet solidify to form nanosphere in water.
(3) preparation of micro-nano ball storage layer:
The micro-/ nano ball for preparing is mixed with the macromolecular material with viscosity, and the thickness of micro-/ nano ball storage layer is 10-1500um.
Described macromolecular material with viscosity is meant following one or more: polyvinyl pyrrolidone, polyvinyl alcohol, ethylene vinyl acetate copolymer, poloxamer, polyacrylic acid, sodium polyacrylate, carbomer, polyacrylic resin, starch, dextrin, methylcellulose, hydroxyethyl-cellulose, hydroxypropyl cellulose, hypromellose, arabic gum, gelatin, chitosan, sodium alginate, hyaluronic acid, albumin, agar, poly-maltotriose, xanthan gum, guar gum and pressure sensitive adhesive.
Described pressure sensitive adhesive composition comprises: any one or a few in rubber type pressure-sensitive adhesive, thermoplastic elastomer pressure-sensitive adhesive, Acrylic Pressure Sensitive Adhesive, the organosilicon.
(4) preparation backing layer:
Can be directly with the backing layer material filming on support, also existing film material can be bonded on the support as backing layer, backing layer can be single or multiple lift, backing layer itself can be the biocompatibility pressure sensitive adhesive, or contain the biocompatibility pressure sensitive adhesive, pressure sensitive adhesive content is 0-100%, the micro-/ nano ball storage layer of preparation can be stated from backing layer under the assistance of various macromolecular materials with cementation, physical method that also can be by heat seal or pressing and chemical bond and method, make micro-/ nano ball storage layer and backing layer directly be laminated with, the thickness of backing layer is 2-1000um.
Described macromolecular material with cementation is meant following any one or multiple: polyvinyl pyrrolidone, polyvinyl alcohol, ethylene vinyl acetate copolymer, poloxamer, polyacrylic acid, sodium polyacrylate, carbomer, polyacrylic resin, starch, dextrin, methylcellulose, hydroxyethyl-cellulose, hydroxypropyl cellulose, hypromellose, arabic gum, gelatin, chitosan, sodium alginate, hyaluronic acid, albumin, agar, poly-maltotriose, xanthan gum, guar gum and biocompatibility pressure sensitive adhesive.
Described pressure sensitive adhesive composition is following any one or multiple: rubber type pressure-sensitive adhesive, thermoplastic elastomer pressure-sensitive adhesive, Acrylic Pressure Sensitive Adhesive, organosilicon.
(5) preparation protective film:
After adhering to micro-/ nano ball storage layer on the backing layer, prepare layer protective layer thereon.
Described preparation protective film, specific as follows: the protecting film for preparing is wrapped in storage layer, perhaps with the direct film forming of protecting film material on micro-/ nano ball storage layer surface, the thickness of described protective film is 1um-1000um.Protective film protection micro-nano ball medicine film layer is avoided being polluted, and protection micro-/ nano ball storage layer is not mechanically damaged in course of conveying, after the dissolving micro-/ nano ball storage layer is come out in vivo, directly contacts with tissue and carries out drug release.
Operation principle of the present invention is: backing layer tightly is overlying on the support, has biocompatibility and anti-certain acid-base value, does not allow drug solution ooze out and does not also allow the interior solid-liquid matter of digestive tract immerse from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Medicine will discharge in distinctive mode after body fluid immerses storage layer.Protective layer is positioned on the micro-nano ball storage layer, and this layer has enough intensity and toughness, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.Protective layer has water solublity, can be dissolved in mucus voluntarily or organize transudate after putting into body, makes micro-/ nano ball storage layer directly contact and carry out the release of medicine with pathological tissues, thereby plays the effect of part, targeting, sustained-release administration.Protective film has slight loss and the damaged release that can not influence medicine, because it not as release-controlled film, does not influence the release of medicine, this is that general release-controlled film, organic short infiltration layer or medicine film layer itself are inaccessible as protecting film institute.
The prepared carried medicine sustained-release micro-/ nano of the present invention ball alimentary stent is used for that digestive tract that targeted therapy innocent and malignant tumour and other pathological changes cause blocks or narrow.The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.The micro-/ nano ball can improve the dissolution rate of medicine relatively, improves the biological membrane permeability of medicine, and plays targeting, improves bioavailability of medicament.Micro-/ nano ball appendix after on the alimentary stent, tumor locus and near mucosal sites can carry out targeting, slowly and long-term release, can play good therapeutic effect to the digestive tract cancer patient.The dissolving of protective film, the reducing of micro-/ nano ball storage layer, the recovery of pathological tissues further obtains expansion with the bore that makes support, has increased the unobstructed property of tract.
The specific embodiment
Embodiment 1
1, be equipped with medicine carrying microballoons with the legal system that is heating and curing:
To get in the 5-fluorouracil solution that bovine serum albumin 250mg is dissolved in 1mL 1%, mix with the Oleum Gossypii semen that 100ml contains 10% span again, under the 2500rpm rotating speed, stir 10min, again ultrasonic emulsification.Other gets Oleum Gossypii semen 100ml and is heated to 180 ℃, under stirring under the 2500rpm rotating speed, add above-mentioned emulsion gradually, 180 ℃ of insulation 10min, continue to be stirred to room temperature, add diethyl ether or petroleum ether 200ml defat, centrifugal under the 3000rpm rotating speed, discard oil phase, precipitation is used ether, ethanol rinsing successively, makes the 5-fluorouracil microsphere.
2, the preparation of microsphere storage layer:
Microsphere and stickum PVP are mixed with the microsphere storage layer and adhere on the backing layer, storage layer thickness is 200um.
3, the preparation of backing layer:
Get 10g silicone rubber, be dissolved in the 20ml toluene.Add the 0.5g ethyl orthosilicate then, the 0.1g firming agent stirs and made it even in 10 minutes.Then the support that cleans up is immersed wherein, take out behind the stop 5min.On Rotary Evaporators, install and runing rest, and warming and humidifying 2 hours, become homogeneous film as backing layer.Thickness is 1000um.
4, preparation protective film:
Take by weighing HPMC500mg, add the dissolving of 100ml distilled water, and pour in homemade at the uniform velocity sprayer unit.With propping up on the evaporimeter that is placed at the uniform velocity rotation, quantitatively shoot out.Forming thickness at last on storage layer is the HPMC protective layer of 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 2
1, employing adds the cross-linking agent solidification method and prepares medicine carrying microballoons:
Preparation ametycin microsphere is got ametycin 10mg and Algin 1000mg in 1: 100 (W/W) ratio.Earlier the 1g Algin is dissolved into the homogeneous thick liquid with distilled water in 80 ℃, concentration is 6%, adds 10mg ametycin and 0.1% calcium chloride solution 0.5ml more successively, mixing.This mixed liquor forms cross-linked network structure and generates gel under acid, high volence metal ion and other bi-functional cross-linking agent effect, reprocessing is shredded into the microsphere that mean diameter is the 600um diameter.
2, the preparation of micron ball storage layer:
Microsphere and stickum PVP are mixed with the microsphere storage layer and adhere on the backing layer, storage layer thickness is 1200um.
3, the preparation of backing layer:
Backing layer is two-layer.Get the 10g ethylene/vinyl acetate copolymer, be dissolved in the 80ml toluene.The support that cleans up is immersed wherein, take out behind the stop 5min.Place 5h solvent flashing film forming in 90 ℃ of following baking ovens, as the internal layer backing layer, thickness is 10um.Other gets the acrylate pressure-sensitive adhesive film as outer backing layer, and thickness is 20um.
4, preparation protective film:
Take by weighing low-molecular-weight PVA10mg, add the dissolving of 100ml distilled water, and pour in homemade at the uniform velocity sprayer unit.With propping up on the evaporimeter that is placed at the uniform velocity rotation, quantitatively shoot out.Forming thickness at last on storage layer is the PVA protective layer of 1000um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 3
1, the preparation of medicine carrying microballoons:
Cisplatin 200mg is distributed in the dichloromethane solution of 50ml of the poly-L-propionic ester of 700mg, and contains 0.05%MC and the 4%PVA mixed aqueous solution mixes, ultrasonic breast is spared into O/W type emulsion, behind the steaming vibrating dichloromethane promptly.
2, the preparation of micro-nano ball storage layer:
The microsphere for preparing mixed with PLGA and add dextrin and bonding with backing layer.Storage layer thickness is 200um.
3, the preparation of backing layer:
2g polyurethane is dissolved in the 20mlDMF solution.40 ℃ of stirrings dissolving down add after evenly after 6 hours and are poured into film forming on glass.Then this film is bonded on the support with silicone adhesive.Thickness is 20um.
4, preparation protective film:
Take by weighing low molecular weight HPMC, add the dissolving of 100ml distilled water, and pour homemade at the uniform velocity sprayer unit into.With propping up on the evaporimeter that is placed at the uniform velocity rotation, quantitatively shoot out.Forming thickness at last on storage layer is the HPMC protective layer of 1um.Thickness is 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 4
1, adopt the irradiation polymerization to prepare medicine carrying microballoons:
Methyl methacrylate 600mg is dissolved in the 5-fluorouracil solution of 100mg, the Co r-roentgenization of reuse 5 * 10-5Gy obtains the microsphere of methyl methacrylate polymerization embedding medicinal.
2, the preparation of microsphere storage layer:
The microsphere for preparing is mixed with stickum PVP, and hot pressing is on backing layer.
3, the preparation of backing layer:
The glass plate of band periphery is paved.Add 2-hydroxyethyl methacry-late, cross-linking agent mixed solution (10: 0.5).Shine UV or visible light certain hour then, make it crosslinked.So repeatedly, film forming medicine film as substrate, is continued film forming above that.As backing layer, thickness is 100um.
4, preparation protective layer:
On the drug-reservoir layer, attaching does not influence the macropore silicone rubber of drug release as protective layer.Thickness is 100um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 5
1, adopt emulsion polymerization method to prepare medicine-carried nanospheres:
Take by weighing 10mg amount 5-fluorouracil, after adding 100ml 0.1mol/l dissolve with hydrochloric acid solution, add pluonicF68 solution and stabilizing agent, after regulating pH value, under agitation drip the monomeric organic solvent of cyano-containing Isobutyl 2-propenoate, stirred 3 hours, add anhydrous sodium sulfate, continue again to stir 1 hour, filter with the G3 sintered glass funnel, promptly.
2, the preparation of nanosphere storage layer:
The medicine-carried nanospheres for preparing is mixed with stickum PVP and adhere on the backing layer.Nanosphere storage layer thickness is 10um.
3, the preparation of backing layer:
10g silicone rubber is got in employing, is dissolved in the 20ml toluene.Add the 0.5g ethyl orthosilicate then, the 0.1g firming agent stirs and made it even in 10 minutes.Then the support that cleans up is immersed wherein, take out behind the stop 5min.On Rotary Evaporators, install and runing rest, and warming and humidifying 2 hours, homogeneous film become, as backing layer.Thickness is 2um.
4, preparation protective layer:
The spraying gelatin is as protective layer, and thickness is 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 6
1, adopt the natural polymer coacervation to prepare medicine-carried nanospheres:
Take by weighing the 50mg amycin and add gelatin 3ml, emulsifying in the 3ml Oleum sesami.The emulsion that forms is cooled off in ice bath, the reuse acetone diluted, the filter membrane filtration with the 50nm aperture discards big microsphere.With the oil on the acetone flush away nanosphere, the acetone soln 30ml that adds 10% formaldehyde solidified nanosphere 10 minutes, and acetone is washed, air drying, promptly.
2, the preparation of microsphere storage layer:
Nanosphere is mixed with viscosity starch and adhere on the backing layer, this drug-reservoir layer thickness is 1500um.
3, the preparation of backing layer:
Adopt the mixture that backing layer is PVA and silicone rubber.With getting 10g silicone rubber, be dissolved in the 20ml toluene.Add the 0.5g ethyl orthosilicate then, the 0.1g firming agent stirs and made it even in 10 minutes.Then the support that cleans up is immersed wherein, take out behind the stop 5min.On Rotary Evaporators, install and runing rest, and warming and humidifying 2 hours, homogeneous film become.Dip PVA solution thereon again, volatilize, as backing layer.Thickness is 20um.
4, preparation protective film:
Take by weighing low molecular weight HPMC 10mg, add the dissolving of 100ml distilled water, and pour in homemade at the uniform velocity sprayer unit.With propping up on the evaporimeter that is placed at the uniform velocity rotation, quantitatively shoot out.Forming thickness at last on storage layer is the HPMC protective layer of 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 7
1, the preparation of medicine-carried nanospheres:
Intra-liquid desiccation method.Paclitaxel 100mg and polycaprolactone 1g are dissolved in chloroform,, can make in 45 minutes with ultrasonic emulsification in 0.5% aqueous gelatin solution at 15 ℃
.O/W type emulsion.Reheat to 40 ℃ also continues to make solvent evaporation under supersound process, and is centrifugal, washing, lyophilizing, the nanosphere of particle diameter 500nm.
2, the preparation of nanosphere storage layer:
Nanosphere is mixed with viscosity starch and adhere on the backing layer, this drug-reservoir layer thickness is 250um.
3, the preparation of backing layer:
10g polyurethane is dissolved in dimethyl sulfoxide makes solution, stir with 100 rotating speeds that change part and made it even in 10 minutes.The support that will clean then immerses and stopped 10 minutes, is positioned in the special Rotary Evaporators after then it being taken out, and carries out heating and moistening 2 hours, and temperature is 40-80 ℃, and humidity is 80-100%, makes backing layer.Thickness is 80nm.
4, preparation protective film:
Take by weighing low molecular weight HPMC, add the dissolving of 100ml distilled water, and pour in homemade at the uniform velocity sprayer unit.With propping up on the evaporimeter that is placed at the uniform velocity rotation, quantitatively shoot out.Forming thickness at last on storage layer is the HPMC protective layer of 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 8
1, adopt automatic emulsified legal system to be equipped with medicine-carried nanospheres:
DL-poly (lactide-co-glycolide) 100mg and 5-fluorouracil 10mg are mixed among the water 1.5ml of 0.2um membrane filtration, add mixed solvent (15ml acetone, 0.5ml dichloromethane), pour in the 50mlPVA aqueous solution (20g/L), acetone diffuses into water rapidly, forms the emulsion droplet (automatic emulsified) of nano-scale.Through 3-4 hour, dichloromethane volatilized from solvent, and emulsion droplet solidify to form nanosphere in water.
2, the preparation of nanosphere storage layer:
With nanosphere mix with viscosity starch and hot pressing on backing layer, this drug-reservoir layer thickness is 250um.
3, the preparation of backing layer:
With the rubber type pressure-sensitive adhesive is backing layer.Thickness is 40um.
4, preparation protective layer:
The spraying gelatin is as protective layer, and thickness is 1um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act on disease and hand near tissue or its, thereby carry out slow, long term administration, reach the narrow purpose for the treatment of of digestive tract in the part.
Embodiment 9
1, the preparation of medicine-carried nanospheres:
Intra-liquid desiccation method.Paclitaxel 200mg and polycaprolactone 2g are dissolved in chloroform,, can make O/W type emulsion in 45 minutes with ultrasonic emulsification in 0.5% aqueous gelatin solution at 15 ℃.Reheat to 40 ℃ also continues to make solvent evaporation under supersound process, and is centrifugal, washing, lyophilizing, the nanosphere of particle diameter 500nm.
2, the preparation of nanosphere storage layer:
With nanosphere mix with viscosity starch and hot pressing on backing layer, this drug-reservoir layer thickness is 250um.
3, the preparation of backing layer:
The thermoplastic elastomer pressure-sensitive adhesive is as backing layer.Thickness is 1000um.
4, preparation protective film:
Take by weighing low molecular weight HPMC, add the dissolving of 100ml distilled water, and pour in homemade at the uniform velocity sprayer unit.With propping up on the evaporimeter that is placed at the uniform velocity rotation, quantitatively shoot out.Forming thickness at last on storage layer is the HPMC protective layer of 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Embodiment 10
1, adopt automatic emulsified legal system to be equipped with medicine-carried nanospheres:
DL-poly (lactide-co-glycolide) 200mg and 5-fluorouracil 20mg are mixed among the water 3.0ml of 0.2um membrane filtration, add mixed solvent (30ml acetone, the 1ml dichloromethane), pour in the 100mlPVA aqueous solution (20g/L), acetone diffuses into water rapidly, forms the emulsion droplet (automatic emulsified) of nano-scale.Through 3-4 hour, dichloromethane volatilized from solvent, and emulsion droplet solidify to form nanosphere in water.
2, the preparation of microsphere storage layer:
With nanosphere mix with viscosity starch and hot pressing on backing layer, this drug-reservoir layer thickness is 250um.
3, the preparation of backing layer:
With the rubber type pressure-sensitive adhesive is backing layer.Thickness is 5um.
4, preparation protective layer:
The spraying gelatin is as protective layer, and thickness is 50um.
The prepared micro-/ nano ball of the present invention has excellent particle size and particle size distribution, higher entrapment and carrying drug ratio.Backing layer tightly is overlying on the support, prevents that drug solution from oozing out the solid-liquid matter that does not also allow in the digestive tract and immersing from backing layer.Be the micro-nano ball storage layer on the backing layer, medicine is stored in this layer with the micro-nano ball form and is protected, and exempts from the destruction of digestive tract acid ﹠ alkali liquid and enzyme.Protective layer is positioned on the micro-nano ball storage layer, can protect the medicine film to avoid polluting, and in the complete implant into body of protection carried medicine sustained-release micro-/ nano ball stand.After carrying in the micro-/ nano ball stand implant into body, directly act near pathological tissues or its, thereby carry out slowly in the part, long term administration, reach the narrow purpose for the treatment of of digestive tract.
Claims (10)
1. the preparation method of a carried medicine sustained-release micro-/ nano ball alimentary stent is characterized in that, may further comprise the steps:
(1) a kind of preparation medicine carrying microballoons in the following four kinds of methods of employing: the genealogy of law 1. is heating and curing; 2. add the cross-linking agent solidification method; 3. the solvent aggregation method volatilizees; 4. shine polymerization;
The described genealogy of law that is heating and curing, specific as follows: by mass ratio is to get bovine serum albumin and 5-fluorouracil at 10: 1, the Oleum Gossypii semen that contains 10%Span with 100ml mixes, speed with 2500rpm stirs 10min, ultrasonic emulsification, other gets Oleum Gossypii semen 100ml and is heated to 180 ℃, under same mixing speed, add above-mentioned emulsion gradually, 180 ℃ of insulation 10min continue to be stirred to room temperature, add diethyl ether or petroleum ether 200ml defat, speed with 3000rpm is centrifugal, discard oil phase, precipitation is used ether, ethanol rinsing successively, makes the 5-fluorouracil microsphere;
The described cross-linking agent solidification method that adds adopts in following two kinds of methods any one: method one: medicine is scattered in the solution of carrier material, adds cross-linking agent and be solidified into gel, be dispersed into microparticulate system; Perhaps method two: medicine is dispersed in the carrier material solution, is emulsified into w/o type emulsion, add cross-linking agent again and make the oil-water interfaces of microdroplet be cross-linked into solid particle, washing promptly;
Described volatilization solvent aggregation method, its method is: medicine and substrate are scattered in the organic solvent, in the time of stirring, dropwise are added in the aqueous solution of polymer, obtain 0/W type emulsion, fling to organic solvent, washing, the dry microsphere that gets.4. shine polymerization: the monomer solution of polymer is brought out polyreaction with r ray or ultraviolet radiation, disperse to such an extent that microparticulate is, methyl methacrylate is dissolved in the 5-fluorouracil suspension, and reuse Co r-roentgenization obtains the microsphere of methyl methacrylate polymerization embedding medicinal;
Described irradiation polymerization, its method is: the monomer solution of polymer is brought out polyreaction with r ray or ultraviolet radiation, disperse to such an extent that microparticulate is, methyl methacrylate is dissolved in the 5-fluorouracil suspension, reuse Co r-roentgenization obtains the microsphere of methyl methacrylate polymerization embedding medicinal;
(2) adopt a kind of preparation medicine-carried nanospheres in following four kinds of methods: 1. emulsion polymerization method; 2. natural polymer coacervation; 3. intra-liquid desiccation method; 4. automatic emulsified method;
Described emulsion polymerization method, its method is: after taking by weighing 5-fluorouracil and dissolve with hydrochloric acid solution, add pluonicF68 solution and stabilizing agent, after regulating pH value, under agitation drip the monomeric organic solvent of cyano-containing Isobutyl 2-propenoate, stir, add anhydrous sodium sulfate, continue again to stir, filter with sintered glass funnel, promptly;
Described natural polymer coacervation, its method is: take by weighing amycin and gelatin, emulsifying in Oleum sesami, the emulsion that forms is cooled off in ice bath, the reuse acetone diluted filters with filter membrane, discards big microsphere, with the oil on the acetone flush away nanosphere, the acetone soln that adds formaldehyde makes nanosphere solidify washing with acetone, air drying, promptly;
Described intra-liquid desiccation method, its method is: medicine and polymer is dissolved in chloroform, in aqueous gelatin solution, makes w/o type emulsion with ultrasonic emulsification, heating, and continue under supersound process, to make solvent evaporation, centrifugal, washing, lyophilizing gets nanosphere;
Described automatic emulsified method, its method is: DL-poly (lactide-co-glycolide) and medicine are suspended in the water of membrane filtration, add acetone and dichloromethane mixed solvent, pour in the PVA aqueous solution, acetone diffuses into water rapidly, forms the emulsion droplet of nano-scale, leaves standstill, dichloromethane volatilizees from solvent, and emulsion droplet solidify to form nanosphere in water;
(3) preparation of micro-nano ball storage layer: the micro-/ nano ball for preparing is mixed with the macromolecular material with viscosity;
(4) preparation backing layer: directly with the backing layer material filming on support, perhaps existing film material is bonded on the support as backing layer;
(5) preparation protective film: after adhering to micro-/ nano ball storage layer on the backing layer, on micro-/ nano ball storage layer, prepare layer protective layer.
2. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, the described method one that adds in the cross-linking agent solidification method, concrete steps are as follows: preparation ametycin microsphere, get ametycin and Algin by 1: 100 mass ratio, earlier Algin is dissolved into the homogeneous thick liquid with distilled water in 80 ℃, concentration is 6%, add ametycin and an amount of mixing of 0.1 calcium chloride solution more successively, this mixed liquor is in acid, high volence metal ion and other bi-functional cross-linking agent effect form cross-linked network structure down and generate gel, and reprocessing is shredded into the microsphere that mean diameter is 600um;
The described method two that adds in the cross-linking agent solidification method, concrete steps are as follows: methotrexate/PVA is distributed in the 10ml aqueous solution with mass ratio at 1: 5, be added under rotating speed 900rpm stirs and contain in the 2.5% emulsifying agent oil solution, water wherein: oil=1: 3, continue to stir, emulsifying gets w/o type emulsion, adds cross-linking agent and makes emulsion droplet oil-water interfaces crosslinking curing, separate, washing promptly gets microsphere.
3. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described volatilization solvent aggregation method, its method is specific as follows: cisplatin is distributed in the dichloromethane solution of poly-L-propionic ester, the mass ratio of cisplatin and poly-L-propionic ester is 2: 7, with contain 0.05% methylcellulose and 4% polyvinyl alcohol mixing water solution mixes, ultrasonic breast is spared into O/W type emulsion, behind the steaming vibrating dichloromethane promptly.
4. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described irradiation polymerization, specific as follows: that methyl methacrylate is dissolved in the 5-fluorouracil suspension, described suspension, the mass ratio of its methyl methacrylate and 5-fluorouracil is 6: 1, reuse 5 * 10
-5The Co r-roentgenization of Gy.
5. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described emulsion polymerization method, it is specific as follows: in proportion 1: after 15W (mg)/V (ml) takes by weighing 5-fluorouracil and 0.1mol/l dissolve with hydrochloric acid solution, add pluonicF68 solution and stabilizing agent, after regulating pH value, under agitation drip the monomeric organic solvent of cyano-containing Isobutyl 2-propenoate, stirred 3 hours, add anhydrous sodium sulfate, continue again to stir 1 hour, filter with sintered glass funnel, promptly.
6. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described natural polymer coacervation, specific as follows: by 10: 1W/W takes by weighing amycin and gelatin, emulsifying in the 3ml Oleum sesami, the emulsion that forms is cooled off in ice bath, the reuse acetone diluted, the filter membrane filtration with the 50nm aperture discards big microsphere, with the oil on the acetone flush away nanosphere, the acetone soln 30ml that adds 10% formaldehyde solidified nanosphere 10 minutes, and acetone is washed, air drying, promptly.
7. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described intra-liquid desiccation method, specific as follows: that medicine and polymer are dissolved in chloroform, in 15 ℃, 0.5% aqueous gelatin solution, can make w/o type emulsion in 45 minutes with ultrasonic emulsification, reheat to 40 ℃, and continue under supersound process, to make solvent evaporation, centrifugal, washing, lyophilizing, the nanosphere of particle diameter 500nm.
8. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described automatic emulsified method, specific as follows: with DL-poly (lactide-co-glycolide) and medicine with 10: 1W/W is suspended among the water 1.5ml of 0.2um membrane filtration, add mixed solvent acetone: dichloromethane=30: 1, pour among the 50mlPVA aqueous solution 20g/L, acetone diffuses into water rapidly, form the emulsion droplet of nano-scale, through 3-4 hour, dichloromethane volatilizees from solvent, and emulsion droplet solidify to form nanosphere in water.
9. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that described macromolecular material with viscosity is meant following one or more: polyvinyl pyrrolidone, polyvinyl alcohol, ethylene vinyl acetate copolymer, poloxamer, polyacrylic acid, sodium polyacrylate, carbomer, polyacrylic resin, starch, dextrin, methylcellulose, hydroxyethyl-cellulose, hydroxypropyl cellulose, hypromellose, arabic gum, gelatin, chitosan, sodium alginate, hyaluronic acid, albumin, agar, poly-maltotriose, xanthan gum, guar gum and pressure sensitive adhesive; Described pressure sensitive adhesive composition comprises: any one or a few in rubber type pressure-sensitive adhesive, thermoplastic elastomer pressure-sensitive adhesive, Acrylic Pressure Sensitive Adhesive, the organosilicon.
10. the preparation method of carried medicine sustained-release micro-/ nano ball alimentary stent according to claim 1, it is characterized in that, described backing layer is a single or multiple lift, backing layer itself is the biocompatibility pressure sensitive adhesive, perhaps for containing the material of biocompatibility pressure sensitive adhesive, perhaps for having the macromolecular material of cementation; Described macromolecular material with cementation is meant following any one or multiple: polyvinyl pyrrolidone, polyvinyl alcohol, ethylene vinyl acetate copolymer, poloxamer, polyacrylic acid, sodium polyacrylate, carbomer, polyacrylic resin, starch, dextrin, methylcellulose, hydroxyethyl-cellulose, hydroxypropyl cellulose, hypromellose, arabic gum, gelatin, chitosan, sodium alginate, hyaluronic acid, albumin, agar, poly-maltotriose, xanthan gum, guar gum and biocompatibility pressure sensitive adhesive; Described pressure sensitive adhesive composition is following any one or multiple: rubber type pressure-sensitive adhesive, thermoplastic elastomer pressure-sensitive adhesive, Acrylic Pressure Sensitive Adhesive, organosilicon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100304440A CN100381183C (en) | 2005-10-13 | 2005-10-13 | Method for preparing digestive tract stent carried with medicines of micro-/nanometer balls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100304440A CN100381183C (en) | 2005-10-13 | 2005-10-13 | Method for preparing digestive tract stent carried with medicines of micro-/nanometer balls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1792387A CN1792387A (en) | 2006-06-28 |
| CN100381183C true CN100381183C (en) | 2008-04-16 |
Family
ID=36804159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100304440A Expired - Fee Related CN100381183C (en) | 2005-10-13 | 2005-10-13 | Method for preparing digestive tract stent carried with medicines of micro-/nanometer balls |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100381183C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161300B (en) * | 2007-11-27 | 2011-03-16 | 北京美中双和医疗器械有限公司 | Arsenic trioxide medicament elution bracket and its preparation method |
| CA2787002A1 (en) * | 2010-01-25 | 2011-07-28 | Concept Medical Research Private Limited | A method and an insertable medical device for delivering one or more pro-healing agents to a target site within a blood vessel post-deployment of a stent |
| CN103418036B (en) * | 2013-08-13 | 2014-10-08 | 山东省医疗器械研究所 | Production method of bonding-type digestive tract support |
| US10226533B2 (en) * | 2014-04-29 | 2019-03-12 | Microvention, Inc. | Polymer filaments including pharmaceutical agents and delivering same |
| CN105860099A (en) * | 2016-04-25 | 2016-08-17 | 宁波工程学院 | Preparation method of gelatin-based hydrogel in microwave-ultrasonic coupling field |
| CN105963800A (en) * | 2016-06-27 | 2016-09-28 | 林春梅 | Medical stent material and preparation method thereof |
| CN106750388B (en) * | 2017-02-23 | 2018-12-28 | 青岛农业大学 | A kind of preparation method of Arabic gum hollow nano-sphere |
| CN110433334B (en) * | 2019-08-27 | 2021-12-14 | 扬州大学 | Preparation method of 3D printing trachea C-shaped bracket and hybrid bracket |
| CN115068669B (en) * | 2022-06-08 | 2023-05-26 | 湖南工业大学 | Triple-network porous embolic microsphere and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557507A (en) * | 2004-01-16 | 2004-12-29 | 东南大学 | Re-stricture preventing medicinal sustained releasing bracket and its preparation |
| CN1634613A (en) * | 2004-09-29 | 2005-07-06 | 上海交通大学 | Plant source alcohol soluble protein and its preparation method |
-
2005
- 2005-10-13 CN CNB2005100304440A patent/CN100381183C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1557507A (en) * | 2004-01-16 | 2004-12-29 | 东南大学 | Re-stricture preventing medicinal sustained releasing bracket and its preparation |
| CN1634613A (en) * | 2004-09-29 | 2005-07-06 | 上海交通大学 | Plant source alcohol soluble protein and its preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1792387A (en) | 2006-06-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100381183C (en) | Method for preparing digestive tract stent carried with medicines of micro-/nanometer balls | |
| WO2020258834A1 (en) | Drug-eluting balloon catheter and preparation method therefor | |
| Xie et al. | Electrospun micro-and nanofibers for sustained delivery of paclitaxel to treat C6 glioma in vitro | |
| Nguyen et al. | Porous core/sheath composite nanofibers fabricated by coaxial electrospinning as a potential mat for drug release system | |
| Liu et al. | A novel trans-lymphatic drug delivery system: implantable gelatin sponge impregnated with PLGA–paclitaxel microspheres | |
| Meinel et al. | Electrospun matrices for localized drug delivery: current technologies and selected biomedical applications | |
| Langer | Biomaterials in drug delivery and tissue engineering: one laboratory's experience | |
| JP5209726B2 (en) | Diarsenic trioxide drug-eluting stent | |
| RU2721655C2 (en) | Coating for an intraluminal divergent catheter, providing contact delivery of microreservoirs with a drug preparation | |
| Goonoo et al. | Drug loading and release from electrospun biodegradable nanofibers | |
| Sinha et al. | Chitosan microspheres as a potential carrier for drugs | |
| WO2017007430A1 (en) | Drug-coated medical devices | |
| JP2009542671A (en) | Active agent elution matrix containing fine particles | |
| Nasari et al. | Poly (ε-caprolactone)/poly (N-vinyl-2-pyrrolidone) core–shell nanofibers loaded by multi-walled carbon nanotubes and 5-fluorouracil: An anticancer drug delivery system | |
| CN101374554A (en) | Gelling hydrophobic injectable polymer compositions | |
| Izadifar et al. | Rate-programming of nano-particulate delivery systems for smart bioactive scaffolds in tissue engineering | |
| Patel et al. | Potential application of PLGA microsphere for tissue engineering | |
| CN110124032A (en) | Antitumor implants and preparation method thereof with local chemotherapy and photo-thermal therapy function | |
| CN114259606A (en) | Drug balloon catheter and surface treatment method of drug balloon | |
| CN108403663A (en) | GO-PEG gel micro-balls with nucleocapsid and its preparation method and application | |
| He et al. | Sequence-controlled delivery of peptides from hierarchically structured Nanomaterials | |
| EP2665464A2 (en) | A carrier for oromucosal, especially sublingual administration of physiologically active substances | |
| US9642697B2 (en) | Breast prosthesis allowing controlled release of drug and production method for same | |
| Mancipe et al. | Electrospinning: New strategies for the treatment of skin melanoma | |
| CN103316351A (en) | Electrostatic spinning complex loaded with two drugs |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080416 Termination date: 20161013 |