Abstract:
This invention relates to a venous cannula for use in conjunction with cardiovascular examinations, treatments and surgery. The venous cannula is configured for two-stage drainage of oxygen-depleted venous blood from a central venous location via a peripheral venous insertion site, such as a femoral vein. The venous cannula is optimized for use in a cardiopulmonary bypass system that includes a multichannel arterial perfusion catheter. The cardiopulmonary bypass system is advantageous for use in performing standard open chest or least invasive cardiac surgical procedures.
Abstract:
A low profile inflation valve located inside a balloon catheter that enables a user to inflate the balloon and exchange other medical apparatus over the catheter while the balloon remains inflated.The low profile inflation valve of the present invention includes a first tube having a lumen and at least one region of decreased inner diameter, and a structure movably located inside the lumen of said first tube, wherein said region of decreased inner diameter of said first tube forms a seal with a portion of said structure. The present invention further includes a method of making a low profile inflation valve using a first and second tube comprising the steps of creating an aperture in at least one side of a second tube, placing the second tube inside a first tube, the first tube being made of thermoplastic material, applying heat to a localized area of the first tube, and compressing the first tube to form a region of reduced internal diameter, the reduced diameter forming a seal with the outside diameter of the second tube.
Abstract:
An angioplasty catheter and method for making and using the same. An angioplasty catheter comprises an inner tube having a proximal end, a distal end, and a lumen extending therethrough; an outer tube disposed over the inner tube, the outer tube having a proximal end and a distal end; a balloon coupled to the distal end of the outer tube; an inflation lumen defined between the inner tube and the outer tube, the inflation balloon in fluid communication with the balloon; and a support block coupled to the inner tube. In addition, a method for manufacturing an angioplasty catheter is disclosed.
Abstract:
The invention is generally directed to an intraluminal catheter with an improved transition between a proximal shaft portion and a more flexible distal shaft portion and a method for making the same. The improvement provides enhanced flexibility, reduced bunching, and kink-resistance, thus, facilitating advancement through tortuous anatomy. The present catheters may be used for either or both angioplasty and stent deployment.
Abstract:
An intraluminal catheter comprising an elongated shaft having a proximal end, a distal end, at least one lumen, and a distal tip having an internal taper. The distal tip has an inner surface tapering distally to an inner diameter smaller than an inner diameter of the shaft proximal to the tapered distal tip. In one embodiment, the distal tip includes an outer surface tapering distally to an outer diameter smaller than an outer diameter of the shaft proximal to the tapered distal tip. In a presently preferred embodiment, the distal tip defines at least in part a guidewire receiving lumen. A method of making a catheter shaft section with an internal taper in accordance with the invention generally includes placing at least a section of a polymeric tube having a first end, a second end and a lumen therein on a section of a mandrel having a straight cylindrical surface with a substantially constant outer diameter, so that a gap exists between an inner surface of the polymeric tube and an outer surface of the mandrel. The polymeric tube on the mandrel is placed within a mold having a tapered end. The polymeric tube is heated and the first end of the polymeric tube is placed in contact with the tapered end of the mold, so that an internal taper is formed in the first end of the polymeric tube.
Abstract:
A system for controlling the manufacture of dimensionally varying tubular members extrudes a continuous tube with a lumen from an extrusion machine. The extrusion machine has a melt pump, which regulates the flow rate of the melt through the extrusion head. The extrusion head forms a melt flow and introduces air pressure within the melt flow to form the lumen of the tubing. An air pressure regulator controls the pressure of the air introduced through the extrusion head. A puller supplies tension to the tubing as it is extruded through the extrusion head. The system uses a diameter gage and/or a wall thickness gage to measure the change in the wall thickness of the tubing as a function of its length. Further, the system uses a laser to gage the profile of the tubing. The system automatically compares the measured dimensions against stored dimension targets to generate feedback to the components of the extrusion machine, automatically adjusting one or more process variables for the next tubular member in the extrusion sequence. Finally, the system sorts the tubular members that fall within acceptable error margins, and sorts out those that fall outside the error margins.
Abstract:
The present invention relates generally to intravascular catheters. More particularly, the present invention pertains to angioplasty catheters with a support block. According to a preferred embodiment, an angioplasty catheter comprises an inner tube having a proximal end, a distal end, and a lumen extending therethrough; an outer tube disposed over the inner tube, the outer tube having a proximal end and a distal end; a balloon coupled to the distal end of the outer tube; an inflation lumen defined between the inner tube and the outer tube, the inflation balloon in fluid communication with the balloon; and a support block coupled to the inner tube. In addition, a method for manufacturing an angioplasty catheter is disclosed.
Abstract:
A device for folding a balloon of a balloon catheter during balloon deflation includes a band and a plurality of elongated fingers that are attached to the band. The band includes a midsection and a pair of overlaps with each overlap extending from the midsection to a respective end of the band. The band is folded into an annulus wherein the overlaps are juxtaposed and can be joined together by soldering, welding or adhesive bonding. The annulus is attached to the catheter tube of the balloon catheter with the fingers extending over the balloon in a substantially same axial direction. In operation, the fingers are moveable between an unstressed configuration, when the balloon is deflated, and a stressed configuration, when the balloon is inflated. In a stressed configuration, the fingers urge against the balloon and are biased toward the stressed configuration to return to an unstressed configuration.
Abstract:
The present invention relates to a method for making a silicon balloon catheter in which a first tube having its outer diameter slightly smaller than that of a desired catheter is formed by an extruding method, mold lubricant is coated at a portion of a balloon injection opening, a thin film type second tube is formed at the coated outer surface of the first tube by a second extruding, and then the catheter is vulcanized and cut. As a result, when liquid is injected to an expansion tube, the second tube is separated from the first tube, thereby performing a function as a balloon. The method for making a balloon catheter using silicon rubber includes the steps of: forming a first tube by extruding firstly, the tube having its outer diameter slightly smaller than that of a desired catheter, then vulcanizing and cutting the first tube; punching two balloon injection openings having small diameter at a portion for expanding into balloon in the first tube after inserting a support rod into a discharge tube path; coating mold lubricant at a portion of the balloon injection opening; connecting the first tubes coated the mold lubricant by using a connection unit after removing the support rod, and thereafter forming a second tube at the coated outside surface of the first tube by extruding secondly, performing a vulcanizing process and cutting again; forming a tip at the tip portion of the first and second tubes; and punching a urine discharge opening at the first tube.
Abstract:
The invention is generally directed to an intraluminal catheter with an improved transition between a proximal shaft portion and a more flexible distal shaft portion and a method for making the same. The improvement provides enhanced flexibility, reduced bunching, and kink-resistance, thus, facilitating advancement through tortuous anatomy. The present catheters may be used for either or both angioplasty and stent deployment.