摘要:
The present invention relates to materials which comprise a surface having pendant groups of formula (I), in which the groups --B-- are the same or different, preferably the same, and each is --CH.sub.2 -- or --C(.dbd.O)--, preferably --CH.sub.2 --, R.sup.1 is hydrogen alkyl of 1 to 12, preferably 1 to 4 carbon atoms, or a group capable of bonding to, or bonded to, a ligand or R.sup.1 is a polymerisable, preferably ethylenically unsaturated, group and Z is a zwitterionic group. Usually both groups B are the same and are joined to identical groups so that the compound of formula (I) is achiral. New compounds are achiral glyceryl phosphatidyl choline analogues. Surfaces having the groups (I) at their surface have improved biocompatibility, and show reduced fibrinogen absorption, reduced platelet activation, reduced microorganism adhesion and are useful in the production of implants or prostheses, for extra-corporeal circuitry for body fluids, for treating membranes of various type, for contact lenses. The compounds may also be used to form liposomes.
摘要:
The present invention is directed to the use of a polymer coating composition microbeads and a high Tg polymer with a Tg of greater than null10null C. for the inner coating on natural and synthetic rubber articles, particularly for latex gloves. The coating composition provides an inner surface coating that reduces friction between the latex and the hand to allow convenient donning. The coating composition is deliverable from an aqueous solution.
摘要:
The present invention provides materials which comprise a surface having pendant zwitterionic groups Z comprising, as anion, a phosphate, sulphonate, carboxylate or phosphate-ester group or a phosphate ester group in which one or more of the ester oxygen atoms is replaced by --S--, --NH-- or by a valence bond and, as cation, an ammonium, phosphonium or sulphonium moiety, provided that where the anion is a phosphate-ester group or derivative thereof or sulphonate and the cation is a trialkyl quaternary ammonium group (the alkyl groups each containing from 1 to 4 carbon atoms) and the group linking the anion and cation moieties is an alkylene group, the alkylene group, contains at least 5, preferably at least 6, and more preferably at least 7, carbon atoms. The materials have improved biocompatibility for instance as evidenced by reduced protein deposition and reduced platelet activation.
摘要:
The invention relates to a directional drug delivery stent which includes an elongated or tubular member having a cavity containing a biologically active agent. In one embodiment, the active agent is diffused from the reservoir directly to the walls of a body lumen, such as a blood vessel, through directional delivery openings arranged on an outer surface of the elongated member. Another variation of the stent includes an osmotic engine assembly for controlling the delivery of the active agent from the reservoir. The drugs which may be applied by the directional delivery stent include, but are not limited to, steroids, anti-inflammatory agents, restenosis preventing drugs, anti-thrombotic drugs, and tissue growth regulating drugs. The invention also relates to a method of using the directional drug delivery stent.
摘要:
Thromboresistant biomedical articles are provided which are useful in the fields of subdermal surgical implants, laboratory apparatus and blood containers. These articles have at least a thin surface coating of an organic polymeric material having fluoroalkyl side chains and simple anionic side groups.
摘要:
A method is disclosed for coating a biomaterial to be placed in contact with a patient's blood flow to inhibit blood coagulation from adhering to the biomaterial that would otherwise result from such contact. A biodegradable material of liquid state compatible with the blood and tissue of the human body is prepared, and an anti-coagulant drug is incorporated into the liquid state of the biodegradable material to form a liquid coating material. The liquid coating material is adhesively applied to a surface of the biomaterial in a substantially continuous overlying layer having a formulation, pattern and thickness selected according to the period of time over which the coating material is to perform its anti-coagulant action. Thereafter the coating material is dried to a layer thickness less than about 100 microns for continuous disintegration thereof as a function of time when the layer is in contact with flowing blood. The method is utilized in an exemplary embodiment in which the biomaterial is a vascular stent.
摘要:
A method of forming a hydrophlic coating on a substrate comprised of applying a hydrophilic copolymer capable of chemically reacting with a coupling agent which will promote adhesion to the substrate. A polyisocyanate coupling agent is applied to the surface from a solvent solution followed by applying the hydrophilic copolymer from solvent solution. In certain instances, the copolymer and isocyanate can be simultaneously applied from a solvent solution. The resulting hydrophilic coating is thrombo resistant, biocompatable and stable.