Surgical instrument
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United States of America Patent
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app pub date -
Nov 30, 2005
filing date -
Feb 8, 2000
priority date (Note) -
Abandoned
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Abstract
An electrosurgical instrument for use in cutting and/or coagulating tissue includes a dielectric material, the dielectric material being positioned in the current pathway between the tissue-treatment regions of first and second electrodes. This can be achieved by providing one or more electrode surfaces coated with a dielectric material having a reactive impedance of less than 3,000 ohms/sq. mm. at 450 kHz. The dielectric coating acts to couple the RF signal into the tissue primarily by capacitive coupling, providing a more even heating of the tissue and the elimination of 'hot spot'. Examples of electrosurgical instruments employing such coated electrodes include forceps, scissors or scalpel blade instruments.
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