Method for low temperature electrosugery and RF generator

Inactive Publication Date: 2009-12-10
MEDTRONIC ADVANCED ENERGY
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  • Abstract
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Benefits of technology

[0005]In accordance with this invention, a method and apparatus for pulsed applications of heat in electrosurgery provide sufficient peak temperature for tissue coagulation (and “blend” cutting) and allow for cooling of tissue between the ap

Problems solved by technology

A problem with electrosurgery is preventing excessive application of heat to the tissue being cut, fulgurated, dessicated, etc. since this tends to produce undesirable affects such as charring and collateral tissue damage.
This is typically caused by high temperatures induced by the application of the electrical energy.
Typically dessication occurs below or close to 100° C. and fulguration at higher temperatures above 100° C. A high temperature during ful

Method used

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  • Method for low temperature electrosugery and RF generator
  • Method for low temperature electrosugery and RF generator
  • Method for low temperature electrosugery and RF generator

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Embodiment Construction

High Voltage Electrosurgery

[0017]The present description is directed to high voltage RF electrical energy applied to an electrosurgical probe for tissue coagulation and cutting. It is understood that the electrosurgery probe itself may be of the types disclosed here or in the above described patent applications or other types as known in the field. Typically the probe has a relatively small surface area at its active electrode portion (tip) to minimize heating of the tissue being treated. The probe may be uninsulated (bare metal) or partly covered with a high dielectric insulating layer. The probe may be mono or bi-polar. In some applications the probe is immersed in the tissue being operated on, which has naturally occurring fluid present or some type of liquid is provided immediately around the probe in the surgical field. In other uses for, e.g., fulguration no liquid is present.

[0018]The present method is intended primarily for use with electrosurgical coagulation, but can be us...

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PUM

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Abstract

Method and apparatus for electrosurgery including tissue coagulation using very high voltage pulses of electrical energy applied to the electrosurgical probe. This minimizes heating of the surrounding tissue in the probe and is especially suitable for precise and limited coagulation and fulguration without excessive tissue charring or other damage. The power at rated load of the applied pulses to the probe is typically over 300 W and the duration of the on time is very short, so each group of pulse bursts is of relatively low duty cycle. An RF generator is also provided for delivering electrical energy to an electrosurgical probe with the proper characteristics, including fast switching times.

Description

FIELD OF THE INVENTION[0001]This invention relates to electrosurgery for biological tissue.BACKGROUND OF THE INVENTION[0002]The field of electrosurgery is well known, see for instance, Palanker U.S. Pat. No. 7,238,185 and Palanker, et al. U.S. Pat. No. 6,780,178 both incorporated herein in their entireties. Briefly, application of a voltage to an electrode is useful for cutting, ablating and fulgurating biological tissue. This is generally known as electrosurgery. Typically the voltage is applied as a train of high frequency pulses in the radio frequency (RF) range to a probe in contact with the tissue.[0003]A problem with electrosurgery is preventing excessive application of heat to the tissue being cut, fulgurated, dessicated, etc. since this tends to produce undesirable affects such as charring and collateral tissue damage. This is typically caused by high temperatures induced by the application of the electrical energy.[0004]Some highly localized high temperature is required dur...

Claims

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Application Information

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IPC IPC(8): A61B18/18H03K3/00
CPCA61B18/18H03K3/02H03K17/691H03K17/0822A61B18/1206A61B2017/00154
Inventor VANKOV, ALEXANDER B.
Owner MEDTRONIC ADVANCED ENERGY
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