Thermal atherectomy device
First Claim
1. A thermal atherectomy device comprisinga tip of high mu material having a round head and elongated cylinder of smaller diameter than said head extending axially therefrom,an axially slotted collar secured to said cylinder remote from said head,a coil of wire wound about said cylinder between said head and said collar and having its end sections extending through said slot in said collar,a smooth coating of low heat conductive material covering said coil, andmeans for connecting said coil of wire to a high frequency source of alternating current.
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Accused Products
Abstract
A catheter is provided with a heated temperature self regulating tip for insertion in an artery to ablate an atherosclerotic plaque obstruction particularly in coronary and peripheral arteries. The heater is located at the distal end of the catheter and has a winding of fine wire around a ferro-magnetic core with the wire being connected via a transmission line to a high frequency constant alternating current source in the megahertz range. The catheter which may or may not employ a guide wire is inserted into and through the lumen of a vessel and guided usually with the assistance of fluoroscopy to the location of the stenosis. The heater is energized to ablate the plaque, the temperature not exceeding a desired temperature as determined by the Curie temperature of the ferromagnetic material.
120 Citations
10 Claims
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1. A thermal atherectomy device comprising
a tip of high mu material having a round head and elongated cylinder of smaller diameter than said head extending axially therefrom, an axially slotted collar secured to said cylinder remote from said head, a coil of wire wound about said cylinder between said head and said collar and having its end sections extending through said slot in said collar, a smooth coating of low heat conductive material covering said coil, and means for connecting said coil of wire to a high frequency source of alternating current.
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7. A thermal atherectomy device comprising
a tip of high mu material having a round head and a coaxial cylindrical extension of lesser diameter, an electrically conductive coil of wire wound about said cylindrical body to a diameter less than the diameter of said head, means for connecting said coil of wire to a source of electrical power to heat said tip to a temperature approaching its effective Curie temperature, a mixture of a glass and a dielectric crossover paste disposed over said coil to the maximum diameter of said head adjacent said head and tapered outwardly along said cylinder.
Specification