Percutaneous angioplasty of chronic obstruction of peripheral arteries by a temperature-controlled Nd:YAG laser system.
The feasibility of an Nd:YAG laser system with automatic control of hot-tip probe temperature was examined in 15 segments (14.7 +/- 6 cm in length) of iliofemoral arteries from 13 patients.  The hot-tip temperature to be attained and the upper limit temperature at which lasing was to be stopped were preset.  A catheter with a 1.8-mm hot-tip probe was introduced into the obstructed segment and angioplasty (lasing time 5-10 sec) was performed under angioscopic guidance.  Recanalization was observed in all segments without obvious complications.  No thermal effects below 50 degrees C, coagulation at 100 degrees C, carbonization at 200 degrees C, or sticking of the hot-tip to the luminal surface at 300 degrees C or over, were observed by angioscopy.  Rapid recanalization was obtained between 200 degrees C and 300 degrees C.  The results indicate that this novel laser system is feasible and hot-tip temperature between 200 degrees C and 300 degrees C is ideal for treatment of chronic arterial obstruction in Japanese patients.
Uchida
Y
Y
Second Department of Internal Medicine, University of Tokyo, Japan.
Fujimori
Y
Y
Tomaru
T
T
Oshima
T
T
Hirose
J
J
D000368:Aged; D000535:Aluminum; D017222:Angioplasty, Balloon, Laser-Assisted / Q000295:instrumentation / Q000379:methods*; D001161:Arteriosclerosis / Q000208:ethnology / Q000601:surgery*; D044466:Asian People; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D005260:Female; D005263:Femoral Artery / Q000601:surgery*; D006358:Hot Temperature; D006801:Humans; D007083:Iliac Artery / Q000601:surgery*; D007564:Japan / Q000208:ethnology; D008297:Male; D008875:Middle Aged; D009354:Neodymium; D016491:Peripheral Vascular Diseases / Q000601:surgery*; D015019:Yttrium