Electrosurgical generator with adaptive power control

a generator and power control technology, applied in the field of electrosurgical generators with adaptive power control, can solve the problems of tissue charring, monotonous rise and fall of tissue impedance, and the inability to control the power supply of the generator, so as to reduce the level of tissue charring, improve the sealing characteristics of the electrode, and reduce the effect of thermal spread
USRE40388E1Inactive Publication Date: 2008-06-17COVIDIEN AG
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
COVIDIEN AG
Publication Date
2008-06-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

An electrosurgical generator has an output power control system that causes the impedance of tissue to rise and fall in a cyclic pattern until the tissue is desiccated. The advantage of the power control system is that thermal spread and charring are reduced. In addition, the power control system offers improved performance for electrosurgical vessel sealing and tissue welding. The output power is applied cyclically by a control system with tissue impedance feedback. The impedance of the tissue follows the cyclic pattern of the output power several times, depending on the state of the tissue, until the tissue becomes fully desiccated. High power is applied to cause the tissue to reach a high impedance, and then the power is reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low power cycle. The control system is adaptive to tissue in the sense that output power is modulated in response to the impedance of the tissue.
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Description

[0001] This application is a Continuation of U.S. application Ser. No. 08 / 838,548, filed on Apr. 9, 1997, now U.S. Pat. No. 6,033,399, the contents of which are incorporated herein by reference.BACKGROUND

[0002] 1. Field of the Invention

[0003] The present invention relates to an electrosurgical generator with an adaptive power control, and more particularly to an eleosurgical generator that controls the output power in a manner that causes impedance of tissue to rise and fall cyclically until the tissue is completely desiccated.

[0004] 2. Background of the Disclosure

[0005] Electrosurgical generators are used by surgeons to cut and coagulate tissue of a patient. High frequency electrical power is produced by the electrosurgical generator and applied to the surgical site by an electrosurgical tool. Monopolar and bipolar configurations are common in electrosurgical procedures.

[0006] Electrosurgical generators are typically comprised of power supply circuits, front panel interface circuits, and...

Claims

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