Angioplasty system having means for identification of atheroscle

Details Angioplasty system having means for identification of atheroscle Angioplasty system having means for identification of atheroscle

1990-11-09

1994-01-04

Shay, David M.

Surgery

Instruments

Light application

606 7, 606 10, 606 15, 606 16, A61N 506

Patent

active

052755940

ABSTRACT:
An angioplasty system and method for identification and laser ablation of atherosclerotic plaque at a target site in a blood vessel includes fluorescence analysis for identification of noncalcified plaque and calcium photoemission analysis for identification of calcified plaque. Calcified plaque is identified by time domain analysis of calcium photoemission. A high energy pulsed ultraviolet laser can be used for stimulation of fluorescence and for stimulation of calcium photoemission. The system is capable of distinguishing between calcium photoemission and a defective condition of optical fibers that are used to deliver laser energy to the target site. In an another embodiment of the angioplasty system, calcium photoemission is identified during a nonablative initial portion of the laser ablation pulse. When calcium photoemission is not identified, the laser ablation pulse is terminated during the initial nonablative portion thereof.

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