摘要:
An apparatus for generating a plasma in the lumen of a small diameter tube includes a housing (12) having a diaphragm (18) which separates the housing into a first chamber (14) equipped with a gas inbleed (26) assembly and a second chamber (16) connected to a vacuum source. Parallel plate electrodes (58) in the first chamber are encased in a dielectric (42) which prevents substantially all plasma discharge external of a plasma zone between the electrodes. A conduit (64) maintains gas flow between the chambers. A bore (52) through the dielectric includes the plasma zone and receives the tube (54) to be plasma treated. A method for treating the luminal wall of a plastic tube (54) includes positioning a tube in the plasma zone, evacuating the chambers, bleeding a gas into the chambers, and delivering radiofrequency power to the electrodes (58). A long tube may be drawn through the plasma zone, or the dielectric and electrodes may be moved past the tube.
摘要:
The invention relates to an apparatus for use in a Plasma Enhanced Chemical Vapor Deposition (PECVD) process whereby a coating of inorganic material is deposited on three-dimensional articles, including low melting temperature polymer articles. The coating possesses excellent gas and/or water vapor barrier properties.
摘要:
An apparatus for generating a plasma in the lumen of a small diameter tube includes a housing (12) having a diaphragm (18) which separates the housing into a first chamber (14) equipped with a gas inbleed (26) assembly and a second chamber (16) connected to a vacuum source. Parallel plate electrodes (58) in the first chamber are encased in a dielectric (42) which prevents substantially all plasma discharge external of a plasma zone between the electrodes. A conduit (64) maintains gas flow between the chambers. A bore (52) through the dielectric includes the plasma zone and receives the tube (54) to be plasma treated. A method for treating the luminal wall of a plastic tube (54) includes positioning a tube in the plasma zone, evacuating the chambers, bleeding a gas into the chambers, and delivering radiofrequency power to the electrodes (58). A long tube may be drawn through the plasma zone, or the dielectric and electrodes may be moved past the tube.
摘要:
A method to reduce high breakout and sustaining forces between slidable surfaces includes applying a film of lubricant to at least one of the surfaces and subjecting the lubricant and surface to an ionizing plasma. The invention includes articles having slidable surfaces of low breakout and sustaining forces.
摘要:
Small diameter plastic tubing is plasma-treated on the lumen wall and endothelial cells are adhered thereto to give antithrombogenic small diameter conduits useful for vascular grafts and other articles intended to come in contact with blood.