Surgery – Instruments – Heat application
Patent
1990-01-12
1991-09-10
Howell, Kyle L.
Surgery
Instruments
Heat application
606 28, A61B 1736
Patent
active
050470256
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.
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Electrical Thermal Angioplasty: Catheter Design Features, In Vitro Tissue Ablation Studies and In Vivo Experimental Findings, David Y. Lo et al., American Journal of Cardiology, Nov. 1, 1987, pp. 1117-1123.
Taylor James M.
Wirt David F.
Howell Kyle L.
Metcal Inc.
Minnesota Mining and Manufacturing Company
Nasser Jr. Robert L.
Rose Howard L.
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