Method and apparatus for pulsed plasma-mediated electrosurgery i

Details Method and apparatus for pulsed plasma-mediated electrosurgery i Method and apparatus for pulsed plasma-mediated electrosurgery i

1999-03-16

2000-10-24

Cohen, Lee

Surgery

Instruments

Electrical application

606 34, 606 45, A61B 1812

Patent

active

06135998&

ABSTRACT:
A method for performing electrosurgery using sub-microsecond, high-power electrical pulses applied to an electrosurgical probe endface. The probe endface has an area of about 200-1000 microns.sup.2. The pulses have a duration less than 300 nanoseconds, and preferably have very fast risetimes and very fast falltimes (e.g. less than 100 nanoseconds). The pulses also have power dissipation greater than 500 Watts (e.g. 800-2500 Watts), or voltage greater than 1.5 kV (e.g. 2-3 kV). These pulse characteristics provide for reduced collateral damage, and effective cutting of tissue. Cutting is mainly provided by plasma streamers which are formed on the probe tip endface. However, cutting is also provided by shock waves formed by the discharges. The method is applicable to microsurgical procedures such as retinal surgery and capsulotomy. Also disclosed are electrical circuits for performing the method.

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Palanker, D, Electrical alternative to pulsed fiber-delivered lasers in microsurgery, J. Appl. Phys. 81(11), pp. 7673-7680, 1997.

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