116 results about "Embolic Agent" patented technology

Intravascular devices (e.g., stents, stent grafts, covered stents, aneurysm coils, embolic agents and drug delivery catheters and balloons) are used in combination with fibrosing agents in order to induce fibrosis that may otherwise not occur when the implant is placed within an animal or to promote fibrosis betweent the devices and the host tissues. Compositions and methods are described for use in the treatment of aneurysms and unstable arterial (vulnerable) plaque.

A microcatheter for removing thromboemboli from cerebral arteries in patients suffering from ischemic stroke. The microcatheter provides an extraction lumen that can be scaled to a very small diameter that is still capable of extracting and emulsifying thrombus without clogging the channel. The microcatheter of the invention uses a series of spaced apart energy application mechanisms along the entire length of the catheter's extraction lumen to develop sequential pressure differentials to cause fluid flows by means of cavitation, and to contemporaneously ablate embolic materials drawn through the extraction lumen by cavitation to thereby preventing clogging of the lumen. The catheter system thus provides a functional high-pressure extraction lumen that is far smaller than prior art catheter systems. Preferred mechanisms for energy delivery are (i) a laser source and controller coupled to optic fibers in the catheter wall or (ii) an Rf source coupled to paired electrodes within the extraction lumen. Each energy emitter can apply energy to fluid media in the extraction channel of the catheter-wherein the intense energy pulses can be sequentially timed to cause fluid media flows in the proximal direction in the channel.

Intravascular devices (e.g., stents, stent grafts, covered stents, aneurysm coils, embolic agents and drug delivery catheters and balloons) are used in combination with fibrosing agents in order to induce fibrosis that may otherwise not occur when the implant is placed within an animal or to promote fibrosis betweent the devices and the host tissues. Compositions and methods are described for use in the treatment of aneurysms and unstable arterial (vulnerable) plaque.

Devices, systems, and methods used to seal a treatment area to prevent embolic agents from migrating are described. The concept has particular benefit in allowing liquid embolic to be used with a variety of intravascular therapeutic applications, including for occluding aneurysms and arteriovenous malformations in the neurovasculature.

A new embolic agent, bioabsorbable polymeric material (BPM) is incorporated to a Guglielmi detachable coil (GDC) to improve long-term anatomic results in the endovascular treatment of intracranial aneurysms. The embolic agent, comprised at least in part of at least one biocompatible and bioabsorbable polymer and growth factors, is carried by hybrid bioactive coils and is used to accelerate histopathologic transformation of unorganized clot into fibrous connective tissue in experimental aneurysms. An endovascular cellular manipulation and inflammatory response are elicited from implantation in a vascular compartment or any intraluminal location. Thrombogenicity of the biocompatible and bioabsorbable polymer is controlled by the composition of the polymer. The coil further is comprised at least in part of a growth factor or more particularly a vascular endothelial growth factor, a basic fibroblast growth factor or other growth factors. The biocompatible and bioabsorbable polymer is in the illustrated embodiment at least one polymer selected from the group consisting of polyglycolic acid, poly~glycolic acid/poly-L-lactic acid copolymers, polycaprolactive, polyhydroxybutyrate/hydroxyvalerate copolymers, poly-L-lactide. Polydioxanone, polycarbonates, and polyanhydrides.

A method for embolization using liquid embolic materials is described. The method comprises the use of two liquid components. The first liquid component is an aqueous solution or dispersion comprising at least one oxidized polysaccharide. The second liquid component is either an aqueous solution or dispersion comprising at least one water-dispersible, multi-arm amine, or a water-dispersible multi-arm amine in the form of a neat liquid. The two components crosslink in situ to form a hydrogel that should act as an effective embolic agent.

The invention discloses collagen sponge and a preparation method thereof. The collagen sponge does not contain a chemical cross-linking agent, has the porosity of over 90 percent, and is prepared by performing radiation cross-linking on aqueous solution of collagen and then freeze-drying the aqueous solution of collagen; and sterilization is performed during cross-linking so that the biosafety problem caused during preparation is solved. The collagen sponge prepared by the method has no residue of chemical reagents, better biocompatibility and structural uniformity, and adjustable degradation rate and mechanical strength, and can be used as biomedical materials such as dressing, tissue engineering stents, artificial tissue components, tissue fillers, embolic agents and the like.

The invention provides a preparation method of a mono-dispersed gelatin embolic microsphere with a precisely-controlled particle size. In the provided method, micro water-in-oil liquid drops are formed in a micro channel reactor at first through a micro-fluidic liquid drop control technology, then a crosslinking agent and a gelatin water solution are taken as the dispersing phase and introduced into the water-in-oil system, and then the mixture is directly cured to form microspheres. By adjusting the flowing speeds of the continuous phase and the dispersing phase, and the flowing speeds of two dispersing phases, the particle size and sphericility can be precisely controlled. The preparation technology is simple and rapid, and the process is controllable. The prepared gelatin microsphere can be used as an embolic agent or an antitumor drug carrier, and can also be applied to cell culture.

The invention concerns a radiopaque, non-biodegradable, water-insoluble iodinated benzyl ether of poly(vinyl alcohol) consisting of a PVA having covalently grafted thereon iodinated benzyl groups comprising 1-4 iodine atoms per benzyl group, a process for preparing the same comprising reacting a 0-100% hydrolyzed PVA with a iodinated benzyl derivative comprising 1-4 iodine atoms per benzyl group in a polar aprotic solvent in the presence of a base in anhydrous conditions. Said iodo-benzylether-PVA is particularly useful as embolic agent in an injectable embolizing composition. The invention also concerns an injectable embolizing composition comprising said iodo-benzylether-PVA and capable of forming a cohesive mass upon contact with a body fluid by precipitation of the iodo-benzylether-PVA. Said injectable embolizing composition is particularly useful for forming in-situ a cohesive mass in a blood vessel or into a tumor. The invention further concerns a coating composition containing said iodo-benzylether-PVA and capable of forming a radiopaque coating on a medical device. The invention further concerns particles formed of said iodo-benzylether-PVA.

The invention provides a method for preparing an iodic liquid embolic agent capable of long-time self-developing. Water-soluble polyvinyl alcohol (PVA) is added with pyridine to be stirred and evaporated for removing the pyridine. Residual reactant is dehumidified and dissolved in dimethyl sulphoxide (DMSO) organic solvent and then is added with solution of iodic compound and dichloromethane and added with triethylamine; and an obtained iodic product (I-PVA) is poured into a mixture of butyl ether and acetone to be deposited and separated. The iodic product is washed in water, is dried and then is confected into the liquid embolic agent by the dimethyl sulphoxide or N-methyl-ketopyrrolidine organic solvent. The liquid embolic agent prepared by the invention is injectable and can develop under X-ray for a long time. When contacting with blood, the organic solvent diffuses fast for depositing and separating solid to take embolic effect. The embolic agent can be used for embolotherapy of cerebral arteriovenous malformation, tumour and other vascular disease.

In an embodiment, a number of synthetic protein triblock copolymers are provided comprising first and second end hydrophobic blocks separated by a central hydrophilic block. In particular, the synthetic proteins are elastin-mimetic proteins having improved mechanical characteristics and related methods of making the proteins with the capability of providing precise control over the mechanical properties. Provided are proteins used in a number of medical devices such as artificial blood vessels, shunts, stents or as embolic agents in situations where it is desired to stop or reduce blood flow or pressure in a localized region.

A method to serially determine changes in perfusion to tissues is provided. This method involves injecting contrast material into a catheter that is positioned in the blood supply proximal to the targeted tissue of interest, acquiring a time series of images that depicts the uptake of this contrast material within the tissue, deriving semi-quantitative or quantitative perfusion metrics based upon the time series of perfusion images, altering perfusion to the targeted tissue by means of injecting pharmacologic agents or embolic agents into the blood vessels supplying the targeted tissue, repeating the acquisition of perfusion images to serially monitor changes in tissue perfusion after each alteration, and calculating changes in perfusion metrics after each series of perfusion images. This method is used to monitor changes in perfusion to various tissues, including a diverse array of tumors. The perfusion imaging method can be acquired using magnetic resonance, x-ray computed tomography, or radionuclide imaging. The perfusion metric is serially measured during an embolization procedure as a means of measuring changes in tissue perfusion or to target an endpoint based upon a specific alteration in the calculated perfusion metric.

The invention relates to a vascular embolic agent, which is composed of liquid metal and/or liquid metal alloy. The liquid metal and liquid metal alloy have the melting points below 60 DEG C and density larger than that of blood, are non-toxic. The vascular embolic agent can be mixed with nano particles or radioactive elements or chemotherapeutics. The invention also provides an injection device of the vascular embolic agent, which has heating and temperature measuring functions. The vascular embolic agent can be used as an imaging equipment contrast agent or a tumor thermotherapy sensitizer, and can be used for preparing tumor radiotherapy and chemotherapeutics drugs. The vascular embolic agent can be extracted from the blood vessel after treatment.

A flow directional infusion device includes a filter valve located at the distal end of a catheter. The filter valve constrains delivery of an embolic agent through the catheter to the locus of the aneurysm. In order to provide such delivery, the valve includes a longitudinal opening, radial opening or is otherwise partially permeable in a direction of the aneurysm so that the embolic agent or a delivery element for such agent is limited toward the aneurysm. In addition, the filter valve permits and directs blood flow within the blood vessel about the aneurysm during the treatment without obstructing the vessel and without allowing retrograde flow of the embolic agent in the vessel upstream of the aneurysm.

Devices, systems, and methods used to seal a treatment area to prevent embolic agents from migrating are described. The concept has particular benefit in allowing liquid embolic to be used with a variety of intravascular therapeutic applications, including for occluding aneurysms and arteriovenous malformations in the neurovasculature.

The present invention relates to a manufacture technology of an embolic agent, in particular to a manufacture technology of a protein microsphere embolic agent. The manufacture technology is realized by the following steps: protein aqueous solution is added into vegetable oil for emulsification under the temperature of 40 DEG C to 70 DEG C; protein microspheres are obtained after deoiling and drying, wherein, the volume ratio of the protein aqueous solution and the vegetable oil is 1 to 2:5; then, the obtained protein microspheres are subject to thermal crosslinking to be solidified; the protein microspheres obtained after solidification are sieved and graded or are deoiled, dried, sieved and graded to obtain a microsphere embolic agent in different particle diameters. An emulsification method is used, so the manufactured protein microspheres have regular shapes; the protein microspheres which are heated and solidified can take effect of the protein microspheres which are solidified by a cross linker and do not contain residual cross linker, and the protein microsphere embolic agent is safer to human body and is fit for the interventional therapy better.

A non-adhesive liquid-state embolizing agent for treating cerebral arteriovenous malformation (AVM) and aneurysm is composed of the water-insoluble organic polymer soluble to organic solvent containing alcohol and the medical developer.

The invention provides a displayable drug-loaded nano silver sodium alginate microsphere blood vessel embolic agent and a preparation method thereof, and relates to a blood vessel embolic agent and a preparation method thereof. An object of the invention is to solve the technical problems that a conventional drug-loaded sodium alginate microsphere blood vessel embolic agent has no X-ray visibility. The method comprises the steps of mixing a sodium alginate solution containing nano silver particles and an antineoplastic drug solution, mixing the above mixture with a solidifying liquid via a dropping method, and thus the displayable drug-loaded nano silver sodium alginate microsphere blood vessel embolic agent is obtained. The displayable drug-loaded nano silver sodium alginate microsphere blood vessel embolic agent has good visibility under X rays, is convenient for observing embolic degree, effectively prevents mistaken embolism, and at the same time, facilitates follow-up observation.

The invention provides a sodium alginate polymer which is generated by carrying out a polymerization reaction, which is initiated by free radicals, to sodium alginate with a monomer which contains anunsaturated double bond and an anionic group, and optionally, a crosslinking agent being poly-functionality water-soluble acrylate or acrylamide. Compared with a sodium alginate microsphere embolic agent on market, the sodium alginate polymer, being a carrier, can adsorb and carry a drug in vitro through ions, wherein the sodium alginate polymer is high in drug carrying capacity and can slowly release the drug in vivo, thus increasing local medicine concentration, prolonging action time of the drug, reducing systemic toxicity of the drug and further improving curative effect of the chemotherapy of the embolism. The invention also provides a novel sodium alginate blood vessel embolism chemotherapy composition, in which the sodium alginate polymer, as the embolic agent and medicine, can be co-delivered to a target blood vessel via a catheter, so that the curative effect of the chemotherapy medicine is fully achieved. The product is free of damage on surrounding normal tissue and can reduce relapse of the diseases.