Electrosurgical instrument with replaceable cartridge
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United States of America Patent
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Dec 15, 2009
Grant Date -
Jul 21, 2005
app pub date -
Jan 18, 2005
filing date -
Jan 16, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
An electrosurgical instrument with a disposable electrosurgical cartridge is provided. The cartridge has first and second energy-delivery surfaces that carry first and second opposing polarity conductors coupled to a voltage source, together with first and second temperature-responsive variable impedance bodies exposed partly in the respective-delivery surfaces. The cartridge further carries a slidable blade member. The temperature-responsive variable impedance bodies are coupled to the voltage source by series and parallel circuitry. In use, the variable impedance bodies are adapted to modulate current flow and ohmic heating in engaged tissue by providing controlled current paths in the tissue and through the variable impedance bodies as the temperature-responsive bodies sense the temperature of adjacent engaged tissue. The engagement surfaces are capable of highly localized modulation of Rf energy application to engage engaged tissue to provide high and low temperatures, voltage and current in the tissue to create high strength welds.
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