摘要:
A venous access catheter shaft and method of using and manufacturing such a catheter is provided. In one aspect of the invention, a catheter is provided comprising a base polymer having a Shore A durometer of 85A or lower, with 2.0% percent by weight of surface modifier, and a radiopaque filler comprising between 20-40 percentage by weight. In another aspect of the invention, a method reducing thrombus accumulation on a venous access catheter is provided wherein the catheter surface's resistance to thrombus formation is enhanced during indwell time by lowering the durometer rating of the base polymer of the catheter without increasing the amount of surface modifier additive. In another aspect of the invention, a method of manufacturing a catheter shaft is provided, wherein the shaft is formed comprising a base polymer having a Shore A durometer of 85A or lower, with 2.0% percent by weight of surface modifier, and a radiopaque filler comprising 30% by weight barium sulfate, and optionally a colorant of 0.2% weight.
摘要:
A vascular access catheter is disclosed that has a catheter shaft with a distal end portion with a distal tip having a sloped face that is positioned at an acute angle from the distal tip relative to a longitudinal axis of the catheter shaft. A first, second, and third lumen extend longitudinally through the catheter shaft. The third lumen is configured for receiving a guidewire and may extend a partial length of the catheter or substantially the entire length of the catheter. The first lumen has an aperture located in the angled edge distal end portion of the catheter next to the distal tip and communicates with the first lumen. The second lumen has an aperture that is positioned in the outer surface of the catheter shaft that is in communication with the second lumen, and is spaced proximally from the first lumen aperture. The catheter includes a fluoropolymer additive with specific compositions and/or purity levels.
摘要:
The present invention provides catheter compositions that provide anti-thrombogenic properties while not adversely impacting mechanical properties. All embodiments of the present invention comprise a catheter that comprises a fluoropolymer additive with specific compositions and/or purity levels.
摘要:
A venous access catheter shaft and method of using and manufacturing such a catheter is provided. In one aspect of the invention, a catheter is provided comprising a base polymer having a Shore A durometer of 85A or lower, with 2.0% percent by weight of surface modifier, and a radiopaque filler comprising between 20-40 percentage by weight. In another aspect of the invention, a method reducing thrombus accumulation on a venous access catheter is provided wherein the catheter surface's resistance to thrombus formation is enhanced during indwell time by lowering the durometer rating of the base polymer of the catheter without increasing the amount of surface modifier additive. In another aspect of the invention, a method of manufacturing a catheter shaft is provided, wherein the shaft is formed comprising a base polymer having a Shore A durometer of 85A or lower, with 2.0% percent by weight of surface modifier, and a radiopaque filler comprising 30% by weight barium sulfate, and optionally a colorant of 0.2% weight.
摘要:
The present invention provides catheter compositions that provide anti-thrombogenic properties while not adversely impacting mechanical properties. All embodiments of the present invention comprise a catheter that comprises a fluoropolymer additive with specific compositions and/or purity levels.
摘要:
The invention relates to oligofluorinated coatings and their use in drag delivery The oligofluorinated coatings are compositions comprising formula (XVII). These coatings are used in a method of delivering a biologically active agent to a tissue surface in a mammalian tissue This method occurs by contacting the surface with the coating including an oligofluorinated oligomer and a biologically active agent wherein the coating resides on the tissue surface and release the biologically active agent to the tissue surface.
摘要:
The invention features the use of a matrix consisting of low molecular weight components for use as a self-eliminating coating for implantable medical devices. The matrix coatings can be used to enhance biocompatibility and to control the local delivery of biologically active agents.
摘要:
The present invention relates to a fibrous scaffold for use as a substrate in soft tissue applications, in particular for preparing annulus fibrosus (AF) tissue. In aspects, the present invention also relates to an engineered biological material comprising AF tissue; constructs comprising one or more engineered biological materials; methods for producing the biological materials and constructs; and methods of using the biological materials and constructs.
摘要:
A sintering schedule to allow the reliable formation of inorganic or ceramic materials, exemplified using porous calcium polyphosphate samples to be used for forming novel implants for bone interfacing applications. The key to the successful definition of the process was the determination of the factors affecting the crystallization temperature of the powders that are gravity sintered to form porous samples of desired density and with a pore size range suitable for the particular application. The method involves applying a sintering procedure to a packed amorphous inorganic powder which gives control over densification and includes choosing sintering temperatures and times sequentially that correspond to the inorganic material being amorphous but having a viscosity to develop significant sinter necks between adjacent powder particles by a viscous flow sintering mechanism while maintaining a desired open-pored structure, followed by a second temperature at which crystallization of the packed amorphous inorganic powder occurs and during which slower diffusion-related mechanisms control sinter neck growth and densification to give a substantially crystalline porous, inorganic structure. In addition, interpenetrating phase composites of biodegradable organic polymers throughout the porous calcium polyphosphate samples were formed and resulted in the development of novel composites with attractive strength and toughness. These materials hold promise for formation of biodegradable fracture fixation implants and degradable anchoring systems for temporary stabilization of bone-interfacing implants designed for fixation by bone ingrowth.
摘要:
A pharmaceutically-active polymeric compound of the general formula (I), Y-[Yn-LINK B-X]m-LINK B (I) wherein (i) X is a coupled biological coupling agent of the general formula (II) Bio-LINK A-Bio (II) wherein Bio is a biologically active agent fragment or precursor thereof linked to LINK A through a hydrolysable covalent bond; and LINK A is a coupled central flexible linear first segment of