42 results about "Bare-metal stent" patented technology

Implantable medical devices may be utilized to locally delivery one or more drugs or therapeutic agents to treat a wide variety of conditions, including the treatment of the biological organism's reaction to the introduction of the implantable medical device. These therapeutic agents may be released under controlled and directional conditions from a stent so that the one or more therapeutic agents reach the correct target area, for example, the surrounding tissue.

A stent having a drug eluting formulation has three components: 1) Anti-neointimal hyperplasia or anti-restenosis agent 2) Main polymer 3) Additive polymer

The anti-neointimal hyperplasia or anti-restenosis agent includes, but not limited to, Paclitaxel, Taxol, Rapamycin, Tacrolimus, Actinomycin D, Methotrexate, Doxorubicin, cyclophosphamide, and 5-fluorouracil, 6-mercapatopurine, 6-thioguanine, cytoxan, cyclosporine, cytarabinoside, cis-platin, chlorambucil, busulfan, and any other drug that can inhibit cell proliferation, and combinations thereof. The main polymer includes, but not limited to, polystyrene, parylene and polyurethane. The additive polymer includes, but not limited to, polyethylene glycol capped with diisocyanate moiety (NCO-PEG).

9.0 g of parylene, 0.6 g of tacrolimus, 0.4 g of NCO-PEG and 0.01 g of triethylene amine were dissolved in 90 g of tetrahydrofuran. The resulting mixture was heated at 40° C. for 30 minutes and cooled to room temperature. To the solution was added 0.1 g of pH 8.0 aqueous solution and mixed thoroughly. The resulting solution is applied to bare metal stents for coating.

Embodiments of the present invention include methods of treating, preventing, or ameliorating a vascular disease and/or disorder in a diabetic or pre-diabetic patient. The methods include implanting a stent in a vascular region in a diabetic patient, and during the implantation procedure, delivering a drug formulation from a source other than the stent to the vascular region. The stent may be a bare metal stent, or a drug eluting stent, such as a metal stent having a coating including a drug. The drug may be everolimus, sirolimus, or a combination thereof. The drug formulation may include dexamethasone, paclitaxel, or a combination thereof.

The invention relates to a gene-releasing type stent and a preparation method thereof. The stent comprises a bare metal stent, a substrate layer and a gene-loading coating, wherein the substrate layer is formed by alternating two layers or more substrate polyanion carrier layers and polycation carrier layers; the gene-loading coating is formed by alternating two layers or more biodegradable polycation carrier layers and gene layers; and all layers are mutually combined by electrostatic attraction. The preparation method for the gene-releasing type stent is characterized in that the metal stent is repeatedly and alternatively dipped into a polycation carrier solution and a gene solution with a solution dipping method, and therefore, the carrier layers and the gene layers can be alternatively coated on the surface of the stent. The stent disclosed by the invention is used for loading all genes (comprising DNA (Deoxyribo Nucleic Acid) and RNA (Ribose Nucleic Acid)) with negative charges to slowly release or quickly release gene drug. After the gene-releasing type stent is implanted in a human body, the gene-releasing type stent not only can mechanically expand a narrow channel but also can release gene therapy drug to the lesion tube wall tissue direction. The gene-releasing type stent is used for treating benign or malignant stenosis diseases of the physiological channel of the human body.

The invention discloses an internal lumen inner bracket with bilateral medicine-releasing performance and a preparation method thereof, relating to the technical field of medical equipment. The bracket consists of a naked metal bracket and an enveloped film, wherein the enveloped film comprises an outer layer medicine-releasing layer, an insulating layer and an inner layer medicine-releasing layer; the outer layer medicine-releasing layer is positioned at the outermost side of the bracket; and the bracket is inwards sequentially provided with the insulating layer and the inner layer medicine-releasing layer. The preparation method of the bracket adopts a solution dipping method or a molten press film packing method, wherein the dissolvent method comprises the following steps of dissolvingmedicine and high polymer material in the dissolvent, and sequentially dipping the naked metal bracket in a coating film in solution with different components; and the molten press film packing method comprises the following steps of mixing the high polymer material with the medicine under high temperature, hot pressing the mixture into a film, and packing the film on the naked metal bracket. After being implanted into human body, the bracket can enlarge a narrow pipeline, outward releases anti-tumor drug and inward releases antibiotic drug, realizes long-term local anti-tumor treatment, and avoids infection and salts sedimentation.

The invention provides a vertebral artery stent and a manufacturing method thereof. The vertebral artery stent comprises multiple unit ring structures, multiple connection structures and a medicament coating. The multiple unit ring structures are arrayed in an axial direction. The multiple connection structures are connected to the multiple unit ring structures to form a net-post-shaped structure. The medicament coating is only coated on the outer surface of the net-post-shaped structure. The medicament coating contains anti-stenosis medicament components. The vertebral artery stent and the manufacturing method thereof have the following beneficial effects: by coating the medicament coating on the outer surface of the net-post-shaped structure, anti-stenosis medicament can be released by the medicament coating as compared with a conventional bare metal support used for vertebral artery so that restenosis is effectively prevented; in addition, the medicament coating is only coated on the outer surface of the net-post-shaped structure; compared with an intravascular stent with inner and outer sides having coatings or the overall coating, the control releasing capability of medicament is enhanced by a single-layer coating; adverse effect of medicament is reduced; and treatment efficiency of medicament is improved.

A method for fixing antibody on the surface of medical instrument, mainly includes: 1) pre-treating the instrument surface; 2) preparing holes: preparing multicrystal phase structure which has same size holes in the surface of the instrument by chemical corrosion, electrochemical corrosion, anodic oxidation, micro-arc oxidation, micro-arc nitridation; 3) post-treating the instrument surface; 4) fixing the antibody: immerging the bare metal scaffold which has holes in surface into a buffer solution containing antibody, adjusting the pH value of the antibody buffer solution, fixing the antibody on the surface of the instrument by the attraction between positive and negative charge and hole effect; and 5) confirming the effectiveness of the fixed antibody by artificial simulation hemodynamics and detecting method of antibody activity in scaffold surface. The method can promote the firm degree of the antibody which is fixed on the surface of the instrument, and keep high activity of the antibody on the surface of medical instrument.

The invention relates to a covered stent. The covered stent comprises a bare metal stent and a membrane covering the bare metal stent. The covered stent further comprises a first area and a second area connected with the first area along the peripheral direction, wherein the first area and the second area extend along the axial direction of the covered stent; and the ductility of the membrane in the first area is less than that in the second area. According to the covered stent, after a window is formed in the membrane of the first area, the membrane at the window has relatively small deformation under the long-term effect of a branch stent since the ductility of the membrane in the first area is relatively small, so that the risk of endoleak of the covered stent at the window in a long term can be reduced; and the membrane of the second area has relatively large ductility and relatively good flexibility, so that the covered stent can easily fit the bent shape of a blood vessel.

The invention discloses a vascular stent that can treat the coronary heart disease. The stent comprises a bare metal stent, a coating that contacts one side of a vascular wall of the bare metal stent and a coating that contacts a side of a vascular cavity of the bare metal stent; the coating that contacts the side of the vascular wall of the bare metal stent is a mixture of a recombinant expression vector that can express human vascular endothelial growth factors or human fibroblasts and degradable polymers; the coating that contacts the side of the vascular cavity of the bare metal stent is a mixture of genes that promote the vascular endothelialization and degradable polymers. The vascular stent that can treat the coronary heart disease of the sent optimizes the functions of the stent more through an unsymmetrical coating manufacture techniques, meanwhile, a series of problems caused by smooth muscle cell proliferation, vascular endothelialization delay and polymer permanent residue, thus improving the treatment effect of the coronary heart disease stent in the maximal degree.

The invention discloses a combined medical instrument formed by a drug coated balloon and a stent. The combined medical instrument comprises the balloon and the stent, a drug-containing coating is coated outside the balloon, the stent is pressed on the outer wall of the balloon in a held manner, a conduit communicated with the balloon is arranged at one end of the balloon, and the far end of the conduit is connected with a conduit base. By the structure, the novel medical instrument is formed by the drug coated balloon (DCB) carrying drugs and the bare metal stent (BMS), so that the therapeutic effect of low restenosis, similar to that of a drug eluting stent (DES), is achieved through a series of novel design of the balloon and the BMS; meanwhile, late stent thrombosis possibly appearing after the DES is used, the risks brought about by taking anticoagulants for a long period of time, and the financial burden caused by taking the anticoagulants can be avoided; and the novel instrument can be used in a way similar to that of the existing DES, so that the same convenience is achieved.

The invention discloses a cerebral aneurysm intracavity blood vessel rebuilding device which comprises a bare metal stent and a tectorial membrane. The bare metal stent comprises a near supporting end, a far supporting end and a middle part, the near supporting end and the far supporting end are located at the two ends of the bare metal stent and used for supporting a aneurysm-carried cerebral artery blood vessel wall, the length of the middle part is slightly larger than the width of a cerebral aneurysm neck, and the middle part is arranged between the two supporting ends. The radial size of the middle part is smaller than that of the two supporting ends, and a blood supply cavity is formed between the middle part and the aneurysm-carried cerebral artery blood vessel wall. The tectorial membrane covers the near supporting end and part of the middle part so as to isolate the cerebral aneurysm from receiving the forward blood flowing, large in vector, of an aneurysm-carried cerebral artery and allow the far supporting end without the tectorial membrane to provide backward blood flow, small in vector, from the far end of the aneurysm-carried cerebral artery. The cerebral aneurysm intracavity blood vessel rebuilding device solves the problems that according to very large and huge cerebral aneurysm stent-assisted coil embolization, the aneurysmal obliteration rate is low and the recurrence rate is high, side branch and perforating branch blood supply is ensured, the cerebral aneurysm rupture is effectively prevented, and the space occupying effect of the cerebral aneurysm is reduced.

A method of selecting a stent for implantation in the circulatory system of a human being includes the steps of determining a threshold level of platelet hyper-coaguability (PHC). One marker of PHC is platelet-fibrin mediated clot strength (MA) of blood. MA above a threshold demonstrates a risk of restenosis that is relatively high. In practicing the method, a sample of blood is obtained from a patient who requires implantation of a stent, the blood sample is tested for its platelet-fibrin mediated clot strength, the clot strength of the blood sample is compared with the threshold level; if the blood sample has a clot strength below the threshold level, selecting a bare metal stent, and if the blood sample has a clot strength at or above the threshold level, selecting a drug-eluting stent. The method includes, in a preferred embodiment, use of a viscoelastic monitor to perform the testing step. Other markers of PHC may also be employed such as measurement of thrombin generation and/or platelet reactivity.

The invention pertains to the field of medical instruments and discloses a paclitaxel-loaded ethylene-vinyl acetate esophageal stent and a preparation method thereof. The stent is composed of a bare metal stent and a covering film covering the bare metal stent. The covering film comprises an ethylene-vinyl acetate esophageal backing layer and a paclitaxel medicine film layer. The inside of the ethylene-vinyl acetate esophageal backing layer is closely adhered to the bare metal stent. The outside of the ethylene-vinyl acetate esophageal backing layer is adhered to the paclitaxel medicine film layer. The stent is 50% in the theoretical drug-loading amount ranges from 48.26% -50.81% in the measured drug-loading amount. Within 80d, paclitaxel ranges from 615.274-1101.368 [mu]m/cm2 in the accumulative releasing amount and ranges from 57.93-108359 [mu]m/cm2 and also ranges from 57.93-108359 [mu]m/cm2 in the infiltration amount from the backing layer. The paclitaxel-loaded ethylene-vinyl acetate esophageal stent and the preparation method thereof have following beneficial effects: the preparation method is easily and conveniently applied; the good mechanical property is obtained; the slow release function can be fulfilled for a long time; and the stent has good functions of mechanical support and prevention against growth inside of tumors.

The invention provides a peripheral drug eluting stent. A drug coating of the peripheral drug eluting stent is divided into an outer sustained-release layer, an intermediate drug sustained-release mixed layer and an inner drug sustained-release mixed layer. The outer sustained-release layer is PLGA with molecular weight being 30000, and PLA:PGA=70:30. The intermediate drug sustained-release mixed layer is a mixture of PTX and PLGA, wherein the molecular weight of PLGA is 20000, PLA:PGA=50:50, and the mass ratio of PTX to PLGA is 3:1. The inner drug sustained-release mixed layer is a mixture of PTX and PLGA, wherein the molecular weight of PLGA is 20000, PLA:PGA=80:20, and the mass ratio of PTX to PLGA is 3:1. The invention further relates to preparation and application of the peripheral drug eluting stent. The peripheral drug eluting stent can effectively treat peripheral artery stenosis, and the problem of in-stent restenosis after a traditional peripheral bare metal stent is implanted into the peripheral vessel is avoided.

The present invention relates to a gene delivery stent using titanium oxide thin film coating and a method for fabricating the gene delivery stent. The gene delivery stent according to the present invention may be loaded with a drug having anti-inflammatory and anti-thrombotic effects and simultaneously deliver a gene capable of inhibiting proliferation of vascular smooth muscle cells. Accordingly, late thrombosis and metal allergy may be reduced, and vascular restenosis in the stent region may be prevented, thereby making it possible to increase treatment effects of the bare metal stent.

The invention discloses a composite drug intravascular stent which comprises a bare metal stent (prepared from a nickel-titanium memory alloy material), recombinant human collagen and folic acid are loaded on a stent body, HMGB1 fragment peptide and a VEGFR-2 antibody are crosslinked on the surface of the bare metal stent. Specifically, a dynamic liquid electrospinning technology is utilized to load a composite spinning solution of recombinant human collagen, folic acid, HMGBI fragment peptide and the VEGFR-2 antibody onto a nickel-titanium memory alloy bare metal stent to form an intravascular stent loaded with the recombinant human collagen and folic acid and cross-linked with the HMGBI fragment peptide and the VEGFR-2 antibody, so that EPCs capture, homing, proliferation and differentiation are promoted, and rapid endothelialization of the blood vessel is realized. The stent not only can be used for coronary stents, but also can be used for cerebrovascular stents, renal artery stents, main artery stents and the like.

The invention relates to a metal support with a micro-nano structure on the surface and belongs to the technical field of intravascular intervention in the department of cardiology. According to the metal support with the micro-nano structure on the surface, the support structure is the same as that of an existing bare metal support. The metal support with the micro-nano structure on the surface is characterized in that the micro-nano structure is arranged on the surface of the metal support. The structure and the material of the metal support are the same as those of a metal support of a drug eluting support (DES) which is not coated with a coating in the prior art. According to the difference, the micro-nano structure needs to be machined on the surface of the metal support in the prior art. The metal support has the advantages that due to the construction of the micro-nano structure on the surface of the support, growth of endothelial cells is facilitated, and the micro-nano structure is consistent with the coronary artery hemodynamics; the bionic structure is arranged on the surface of the support and is closer to the growth environment in a human body, the endothelial cells can be attached to the bionic structure easily, re-endothelialization is accelerated, and restenosis caused by hyperplasia of vascular smooth muscle cells and thrombus formed in an anaphase coronary stent are avoided.

The invention relates to a covered stent, comprising a bare metal stent and a covering film covering the bare metal stent, the covering film includes an inner membrane and an adventitia, and the bare metal stent is arranged on the inner membrane and the outer membrane. Between the adventitia, the intima and at least one surface of the adventitia are provided with binding wires distributed along the circumferential direction of the stent-graft, and the stent-graft includes a first region and a The second region connected to the first region, the first region and the second region both extend along the axial direction of the stent-graft, and the coverage of the binding wire in the first region is zero. In the stent-graft, since the binding wire is arranged in the second region, the ability of the stent-graft to resist expansion in the circumferential direction can be improved, and the risk of the stent-graft function failing due to the expansion of the stent-graft can be reduced.