Patent ID: 9277962
Filing Date: 2016-03-08
CPC Classification: A61B

Claim Text:
1. An electrosurgical system comprising: an RF generator configured to deliver energy through an electrosurgical device to a target tissue in a sealing cycle comprising a series of pulses, the series beginning with an initial pulse having a profile comprising a preset RF level start value that increases at a preset ramping rate to a preset RF end value; and a comparator configured to compare sensed impedance values of the target tissue to each of three preset impedance threshold values, these threshold values comprising a first impedance threshold value for RF setpoint, a second impedance threshold value for cumulative time, and a third impedance threshold value for energy cutback, wherein the second impedance threshold value is higher than the first impedance threshold value, and the third impedance threshold value is higher than the second impedance threshold value; wherein the RF generator is further configured to control the delivery of energy during the sealing cycle by responding to the comparison of the sensed impedance values to the first, second and third impedance threshold values, wherein when the sensed impedance is greater than the second impedance threshold value, a cumulative timing function is initiated, which accumulates time toward a preset sealing cycle duration, and when such time reaches the preset sealing cycle duration, energy delivery ceases immediately.