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IMPEDANCE MEDIATED CONTROL OF POWER DELIVERY FOR ELECTROSURGERY
专利权人:
Tim Koss
发明人:
Tim Koss,Miriam H. Taimisto,Roseanne Varner
申请号:
US13637533
公开号:
US20130116678A1
申请日:
2011.03.25
申请国别(地区):
US
年份:
2013
代理人:
摘要:
A method of controlling electrosurgical power delivery is based on a comparison of sensed tissue impedance to various impedance threshold values. Energy is delivered to tissue in a sealing cycle as a series of pulses. A pulse has a profile with a preset energy starting value that increases at a ramping rate to a preset end value. Sensed impedance data are monitored throughout each pulse and compared to each of an impedance threshold value for RF setpoint, an impedance threshold value for cumulative time, and an impedance threshold value for energy cutback. Based on sensed impedance during a pulse, the profile of a subsequent pulse can be modified. In the event of a high impedance event that reflects low tissue presence, energy may be cutback. A sealing cycle is stopped when a cumulative amount of time with an impedance value over the impedance cumulative time threshold value reaches a limit.
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