Feedback control in an ultrasonic surgical instrument for improved tissue effects
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United States of America Patent
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Sep 19, 2006
Grant Date -
Dec 5, 2002
app pub date -
Jul 18, 2002
filing date -
May 26, 1999
priority date (Note) -
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Abstract
A temperature monitoring device and/or method which control the tissue temperature at the end-effector of a therapeutic ultrasonic cutting and coagulating instrument as the tissue is being heated with ultrasonic vibrations from the end-effector. One or more temperature sensors are located at the end-effector, preferably on a clamping member. The temperature sensors measure the temperature of the tissue engaged by the end-effector either directly or indirectly. An alternate method and apparatus provides an electrical tissue impedance measure in combination with an ultrasonic cutting and coagulating instrument to provide active feedback control of an ultrasonic generator.
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