摘要:
A method for preparing and resulting articles of manufacture comprising a substrate having a surface, a bulk beneath the surface, and a grafted polymer layer on the substrate surface, the substrate surface and the grafted polymer layer, in combination, constituting a modified surface having a fibrinogen adsorption of less than about 125 ng/cm2 in a fibrinogen binding assay in which the modified surface is incubated for 60 minutes at 37° C. in 70 μg/mL fibrinogen derived from human plasma containing 1.4 μg/mL I-125 radiolabeled fibrinogen.
摘要翻译:一种用于制备和产生的制品的方法,包括具有表面,表面下面的体积的基材和在基材表面上的接枝聚合物层,基底表面和接枝聚合物层的组合,构成具有 在纤维蛋白原结合测定中纤维蛋白原吸附量小于约125ng / cm 2,其中将修饰的表面在37℃下在70μg/ mL来自含有1.4μg/ mL I-125放射性标记的纤维蛋白原的人血浆的纤维蛋白原中温育60分钟 。
摘要:
A method of controlling hemostasis by applying a hemostatic agent in a tissue sealant composition. The tissue sealant is a biodegradable, biocompatible synthetic polymer that may not intrinsically possess strong hemostatic properties. Inclusion of a hemostatic material in the tissue sealant can control bleeding at the site and may also provide improved adherence of the sealant to tissue and provide shorter healing times.
摘要:
An impoved barrier or drug delivery system which is highly adherent to the surface to which it is applied is disclosed, along with methods for making the barrier. In the preferred embodiment, tissue is stained with a photoinitiator, then the polymer solution or gel having added thereto a defined amount of the same or a different photoinitiator is applied to the tissue. On exposure to light, the resulting system polymerizes at the surface, giving excellent adherence, and also forms a gel in the rest of the applied volume. Thus a gel barrier of arbitrary thickness can be applied to a surface while maintaining high adherence at the interface. This process is referred to herein as "priming". the polymerizable barrier materials are highly useful for sealing tissue surfaces and junctions against leaks of fluids. In another embodiment, "priming" can be used to reliably adhere preformed barriers to tissue or other surfaces, or to adhere tissue surfaces to each other. A first surface and a barrier, or another surface, are prestained with initiator, and a thin layer of gelable monomer containing initiator is placed between them. Strong adhesion is obtained between the two surfaces on gelation of the monomer. In a similar fashion, tissue surfaces can be adhered to each other in repair of wounds and formation of anastomoses. Methods for use of non-photochemical systems and combined chemical/photochemical systems are described.
摘要:
A method and apparatus for molding polymeric structures in vivo is disclosed. The structures comprise polymers that may be heated to their molding temperature by absorption of visible or near-visible wavelengths of light. By providing a light source that produces radiation of the wavelength absorbed by the polymeric material, the material may be selectively heated and shaped in vivo without a corresponding heating of adjacent tissues or fluids to unacceptable levels. The apparatus comprises a catheter having a shaping element positioned near its distal end. An emitter provided with light from at least one optical fiber is positioned within the shaping element. The emitter serves to provide a moldable polymeric article positioned on the shaping element with a substantially uniform light field, thereby allowing the article to be heated and molded at a desired treatment site in a body lumen.
摘要:
Biocompatible heparin-like material and surfaces thereof are made by co-polymerization of acrylic acid (AA) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and attaching the copolymer to a suitable substrate or blending the copolymer into a suitable substrate. The material produced also possesses surface slip-properties and some decreased bacterial and platelet adherence.
摘要:
A preformed electrical connector for use with body implantable stimulators, such as heart pacemakers, having a signal generator and at least one electrical lead electrically and mechanically connected to each other through the preformed electrical connector. The connector carries at least one terminal to establish electrical contact between the signal generator and electric lead, passageways being provided in the connector body to accept and guide the signal generator feedthrough pin and electrical lead into contact with the terminal. In a preferred embodiment, the terminal is provided with intersecting bores such that the feedthrough pin and electrical lead form electrical contact within or by means of the terminal. The pin may be welded or press fit to the terminal and the lead may be attached to the terminal by means of a setscrew. The preformed connector may be mechanically fastened or fastened with an adhesive to the implantable stimulator. The connector may include one or two terminals and may then connect one or two sets of feedthrough pins and respective electrical lead wires.
摘要:
A method for preparing and resulting articles of manufacture comprising a substrate having a surface, a bulk beneath the surface, and a grafted polymer layer on the substrate surface, the substrate surface and the grafted polymer layer, in combination, constituting a modified surface having a fibrinogen adsorption of less than about 125 ng/cm2 in a fibrinogen binding assay in which the modified surface is incubated for 60 minutes at 37° C. in 70 μg/mL fibrinogen derived from human plasma containing 1.4 μg/mL I-125 radiolabeled fibrinogen.
摘要翻译:一种用于制备和产生的制品的方法,包括具有表面,表面下面的体积的基材和在基材表面上的接枝聚合物层,基底表面和接枝聚合物层的组合,构成具有 在纤维蛋白原结合测定中纤维蛋白原吸附量小于约125ng / cm 2,其中将修饰的表面在37℃下在70μg/ mL来自含有1.4μg/ mL I-125放射性标记的纤维蛋白原的人血浆的纤维蛋白原中温育60分钟 。
摘要:
Processes are described herein for preparing medical devices and other articles having a low-fouling surface on a substrate comprising a polymeric surface. The polymeric surface material may possess a range of polymeric backbones and substituents while providing the articles with a highly efficient, biocompatible, and non-fouling surface. The processes involve treating the substrate to reduce the concentration of chemical species on the surface of or in the substrate without altering the bulk physical properties of the device or article, and thereafter forming a grafted polymer layer on the treated substrate surface.
摘要:
The present invention generally relates to articles of manufacture, such as medical devices, having a non-fouling surface comprising a grafted polymer material. The surface resists the adhesion of biological material.
摘要:
An impoved barrier or drug delivery system which is highly adherent to the surface to which it is applied is disclosed, along with methods for making the barrier. In the preferred embodiment, tissue is stained with a photoinitiator, then the polymer solution or gel having added thereto a defined amount of the same or a different photoinitiator is applied to the tissue. On exposure to light, the resulting system polymerizes at the surface, giving excellent adherence, and also forms a gel in the rest of the applied volume. Thus a gel barrier of arbitrary thickness can be applied to a surface while maintaining high adherence at the interface. This process is referred to herein as “priming”. The polymerizable barrier materials are highly useful for sealing tissue surfaces and junctions against leaks of fluids. In another embodiment, “priming” can be used to reliably adhere preformed barriers to tissue or other surfaces, or to adhere tissue surfaces to each other. A first surface and a barrier, or another surface, are prestained with initiator, and a thin layer of gelable monomer containing initiator is placed between them. Strong adhesion is obtained between the two surfaces on gelation of the monomer. In a similar fashion, tissue surfaces can be adhered to each other in repair of wounds and formation of anastomoses. Methods for use of non-photochemical systems and combined chemical/photochemical systems are described.