Variable stiffness heating catheter
First Claim
1. A variable stiffness catheter for use in interventional vascular therapy, comprising:
- a catheter shaft having a proximal portion and a distal portion, said catheter shaft including a pair of electrically conductive wires for providing resistive heating;
a reinforcing tube having a proximal portion and a distal portion, the reinforcing tube surrounding the catheter shaft, and the distal portion of said reinforcing tube having a surface defining a plurality of apertures to provide variations in stiffness along the length of the catheter shaft; and
at least one outer coaxial sheath over at least a portion of said catheter shaft and covering said plurality of apertures of said reinforcing tube.
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Accused Products
Abstract
The variable stiffness heating catheter includes a heating catheter shaft including at least one electrically conductive member, a reinforcing tube with apertures formed around the surface of the reinforcing tube, and at least one coaxial outer layer of a polymer, metal, or both for providing desired variations in stiffness along at least a portion of the length of the shaft. The apertures can be formed as axial or helical slits in the surface of the reinforcing tube, and the reinforcing tube can also be formed to be tapered at the point where the apertures are formed in the reinforcing tube to provide a heating catheter that is torqueable and pushable at the proximal end, yet soft and flexible at the distal end.
263 Citations
10 Claims
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1. A variable stiffness catheter for use in interventional vascular therapy, comprising:
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a catheter shaft having a proximal portion and a distal portion, said catheter shaft including a pair of electrically conductive wires for providing resistive heating; a reinforcing tube having a proximal portion and a distal portion, the reinforcing tube surrounding the catheter shaft, and the distal portion of said reinforcing tube having a surface defining a plurality of apertures to provide variations in stiffness along the length of the catheter shaft; and at least one outer coaxial sheath over at least a portion of said catheter shaft and covering said plurality of apertures of said reinforcing tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification