Battery-powered electrosurgical forceps with multi-turn selectable-ratio transformer
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United States of America Patent
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Aug 22, 2017
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Sep 3, 2015
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Jan 12, 2010
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Abstract
An electrocautery surgical device comprising a battery source and radio-frequency signal generating circuitry electrically coupled to the battery source and operable to deliver power. In an exemplary embodiment, the radio-frequency signal generating circuitry comprises a transformer having a primary winding and a secondary winding wherein the secondary winding is comprised of a first secondary sub-winding and a second secondary sub-winding, at least one switching component electrically coupled to the first and second secondary sub-windings and operable to switch between engaging the first secondary sub-winding and engaging the second secondary sub-winding such that a current induced by the primary winding flows through either the first secondary sub-winding or the second secondary sub-winding, wherein the first and second secondary sub-windings have a different number of turns such that the radio-frequency signal generating circuitry produces a different impedance value depending on which of the first or second secondary sub-windings is engaged.
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