Intravascular catheter with a nontraumatic distal tip
First Claim
1. An intravascular catheter comprising:
- a) a tubular shaft having proximal and distal ends with an inner lumen extending therein and comprising;
a braided tubular member formed of a plurality of multifilament strands which are impregnated with a thermoset polymeric resin, the thermoset polymer resin which is incorporated into a distal portion of the braided tubular member having a cured hardness less than the cured hardness of the thermoset polymer resin which is incorporated into a proximal portion of the braided tubular member;
a lubricous polymeric lining extending longitudinally through the braided tubular member and defining the inner lumen extending within the elongated shaft of the guiding catheter; and
a thermoplastic polymeric jacket on the exterior of the braided tubular member;
b) a relatively short and straight nontraumatic distal tip having at least two relatively short, coaxially disposed flexible tubular elements, including a first tubular element which is secured to the distal end of the catheter shaft, and a second tubular element which is secured to the first tubular element and which is softer than the first tubular element.
1 Assignment
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Accused Products
Abstract
An intravascular catheter such as a guiding catheter of composite construction having a nontraumatic distal tip comprising a proximal elastomeric tubular element and a distal elastomeric tubular element formed of softer material that the proximal section. The proximal tubular section of the distal tip preferably has a radiopaque material incorporated therein to enable the distal tip to be fluoroscopically observable when in place within a patient. The shaft of the catheter, which exhibits excellent torquability and pushability, is formed with a very thin wall. The catheter shaft includes an inner tubular member of braided polymeric fibrous strands impregnated with a thermoset polyurethane and having an outer jacket or coating of thermoplastic polyurethane secured to the braided tubular member. In some embodiments it is preferred to include a lubricous liner within the braided tubular member.
476 Citations
19 Claims
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1. An intravascular catheter comprising:
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a) a tubular shaft having proximal and distal ends with an inner lumen extending therein and comprising; a braided tubular member formed of a plurality of multifilament strands which are impregnated with a thermoset polymeric resin, the thermoset polymer resin which is incorporated into a distal portion of the braided tubular member having a cured hardness less than the cured hardness of the thermoset polymer resin which is incorporated into a proximal portion of the braided tubular member; a lubricous polymeric lining extending longitudinally through the braided tubular member and defining the inner lumen extending within the elongated shaft of the guiding catheter; and a thermoplastic polymeric jacket on the exterior of the braided tubular member; b) a relatively short and straight nontraumatic distal tip having at least two relatively short, coaxially disposed flexible tubular elements, including a first tubular element which is secured to the distal end of the catheter shaft, and a second tubular element which is secured to the first tubular element and which is softer than the first tubular element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A torquable guiding catheter having an elongated tubular shaft with an inner lumen extending therein and having a preformed distal portion with a soft, relatively short and straight distal tip which facilitates a nontraumatic advancement through a patient'"'"'s vasculature, comprising:
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a) an elongated tubular shaft having proximal and distal ends, an inner lumen extending therein and a preformed distal portion, the shaft comprising; a braided tubular member formed of a plurality of multifilament strands which are impregnated with a thermoset polymeric resin, the braided tubular member having a distal end which has impregnated with a thermoset polymer resin having a cured hardness less than the cured hardness of the thermoset polymer impregnating the braided tubular member proximal thereto, a thermoplastic polymeric jacket on the exterior of the braided tubular member, and b) a nontraumatic tip secured to the distal end of the elongated shaft comprising a relatively short elastomeric proximal tubular element and, in a coaxial configuration therewith, a relatively short elastomeric distal tubular element, with the distal tubular element being softer than the proximal tubular element. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification