摘要:
A central venous access device comprising an extruded catheter shaft having one or more lumens, said catheter shaft comprising a polycarbonate polyurethane having a weight average molecular weight in excess of 90,000.
摘要:
A central venous access device comprising an extruded catheter shaft having one or more lumens, said catheter shaft comprising a polycarbonate polyurethane having a weight average molecular weight in excess of 90,000.
摘要:
The present invention relates to improved methods for making and using bioadhesive, bioresorbable, anti-adhesion compositions made of intermacromolecular complexes of carboxyl-containing polysaccharides, polyethers, polyacids, polyalkylene oxides, multivalent cations and/or polycations. The polymers are associated with each other, and are then either dried into membranes or sponges, or are used as fluids or microspheres. Bioresorbable, bioadhesive, anti-adhesion compositions are useful in surgery to prevent the formation and reformation of post-surgical adhesions. The compositions are designed to breakdown in-vivo, and thus be removed from the body. Membranes are inserted during surgery either dry or optionally after conditioning in aqueous solutions. The anti-adhesion, bioadhesive, bioresorptive, antithrombogenic and physical properties of such membranes and gels can be varied as needed by carefully adjusting the pH and/or cation content of the polymer casting solutions, polyacid composition, the polyalkylene oxide composition, or by conditioning the membranes prior to surgical use. Multi-layered membranes can be made and used to provide further control over the physical and biological properties of antiadhesion membranes. Membranes and gels can be used concurrently. Antiadhesion compositions may also be used to lubricate tissues and/or medical instruments, and/or deliver drugs to the surgical site and release them locally.
摘要:
A medical material composed of a poly(alkyl aryl ether)sulfone copolymer (A) and a thermoplastic polymer (B), such as cellulose triacetate, and being used in contact with the blood, wherein the concentration of the copolymer (A) is at least 40 % by weight at least near the surface of a part having a surface to be used in contact with the blood and the copolymer (A) is a specified polysulfone bearing fluorine atoms and polyalkyl ether units and which is suitable for a hollow fiber membrane for artificial kidneys, and the like.
摘要:
A medical device is described which has on a surface thereof a bio-compatible coating. This bio-compatible coating is formed from a composition which includes an aqueous emulsion or dispersion of a polycarbonate-polyurethane composition containing one or more internal emulsifying agents.
摘要:
The present invention relates to several novel compositions and methods employing infrared radiation, microwave radiation or high voltage polymerization for modifying the surfaces of materials to impart desired characteristics thereto. More particularly, the present invention relates to a method for modifying the surfaces of objects to increase the lubricity, hydrophilicity, hydrophobicity, or biofunctionality of the surface of the object.
摘要:
On améliore la biocompatibilité de divers polymères en les mélangeant avec un polymère contenant un groupe zwittérionique. Ledit groupe zwittérionique est généralement un groupe zwittérionique d'ester de phosphate d'ammonium et le polymère le contenant peut être produit par polymérisation des radicaux libres de monomères éthyléniquement insaturés comprenant un monomère portant le groupe zwittérionique. Les deux polymères peuvent être mélangés par mélange à sec des polymères particulaires ou par mélange des polymères dans une dispersion ou une solution liquide et par extraction de celui-ci du milieu liquide. L'absorption du fibrinogène et/ou l'activation plaquettaire de polymères peuvent être réduites à une valeur inférieure à 80 % voire même à 60 % du polymère de base par incorporation de doses de polymère contenant le groupe zwittérionique de plus de 10 ou 30 %. Les mélanges préférés sont des copolymères de sels internes de phosphate de 2-(méthacryloyloxyéthyl)-2'-(triméthylammonium)éthyle et de (méth)acrylate d'alkyle supérieur mélangés à des polymères oléfiniques et/ou des latex élastomère-caoutchouc. Ces produits peuvent être utilisés dans des dispositifs médicaux dans lesquels ils entrent en contact avec des liquides biologiques dont plus particulièrement le sang, le plasma, le sérum et/ou le film lacrymal.
摘要:
La présente invention concerne un article (cathéter, poche à sang, etc ....) formé d'un composition PVC et dont au moins une partie de la surface est destinée à être en contact avec les milieux biologiques, en particulier le sang et ses dérivés. La composition PVC comporte pour 100 parties de résine PVC, de 10 à 90 parties de plastifiant organique et de 0,005 à 3 parties d'un diorganopolysiloxane présentant des groupes γ-hydroxyalkyle γ-carboxyalkyle ou leurs esters d'alkyle.
摘要:
An antithrombogenic material is described, comprising an expanded polytetrafluoroethylene base having a collagen layer provided on the surface thereof, and further provided thereon a composite layer of collagen and a mucopolysaccharide, and said collagen is crosslinked with a crosslinking agent.