PMID: 9187690Jun 1, 1997Paper

Quantitative assessment of variables that influence soft-tissue electrovaporization in a fluid environment

Urology
L M LimG J Fuchs

Abstract

To evaluate the process of soft-tissue electrovaporization and to study variables that affect tissue clearance rates in a laboratory setting, in order to identify parameters that can optimize transurethral electrovaporization of the prostate. Fresh bovine skeletal muscle, equivalent in impedance and surface properties to the human prostate, was submerged in 3.3% sorbitol solution and electrovaporized with a grooved monopolar electrode attached to the weighted arm of a linear actuator. The effects of excursion rate, applied mechanical load, power setting, electrode configuration, and generator performance on the volume of tissue removed, were assessed. Tissue removal increased significantly when electrode excursion rate was slowed from 25 to 15 mm/s (P < 0.05) and then to 10 mm/s (P < 0.05); when the load was increased from 20 to 50 g (P < 0.005); and when dial power was increased from 120 to 150 W (P < 0.01). Tissue removal was generator dependent. There was no significant difference between the Force 40 and the Force 2 (P > 0.4), but a new computer-controlled constant power output generator (Force FX) did significantly improve tissue vaporization at an equivalent power setting (P < 0.005 and P < 0.01, respectively). Tissue rem...Continue Reading

References

Apr 1, 1991·International Journal of Radiation Oncology, Biology, Physics·T P RyanC T Coughlin
Dec 1, 1989·IEEE Transactions on Bio-medical Engineering·S ThomsenW F Cheong

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