Apparatus and method for electrosurgery

A system for sealing a biological tissue, the system comprising:

• an energy source configured to generate high frequency electrical energy;
• an end effector operably connected to the energy source and configured to provide the high frequency electrical energy to the biological tissue;
• and
• a controller operably connected to the energy source and configured to:
• determine an initial impedance of the biological tissue;
• determine a first-instance size of the biological tissue based on the initial impedance;
• apply a first-instance electrical energy to the biological tissue, wherein a value of voltage of the first-instance electrical energy and a length of time of application of the first-instance electrical energy are both based on the first-instance size of the biological tissue;
• detect an in-process parameter during applying the first-instance electrical energy to the biological tissue, wherein the in-process parameter is (i) a value of in-process impedance of the biological tissue, (ii) a rate of change of the in-process impedance of the biological tissue, (iii) a value of in-process integrated power delivered to the biological tissue, or (iv) a combination thereof;
• determine a second-instance size of the biological tissue based on the detected in-process parameter;
• and
• apply a second-instance electrical energy to the biological tissue, wherein a value of voltage of the second-instance electrical energy and a length of time of application of the second-instance electrical energy are both based on the second-instance size of the biological tissue.

A controller for a device for sealing a biological tissue, the controller being operably connected to an energy source and configured to:

• determine an initial impedance of the biological tissue;
• determine a first-instance size of the biological tissue based on the initial impedance;
• apply a first-instance electrical energy to the biological tissue, wherein a value of voltage of the first-instance electrical energy and a length of time of application of the first-instance electrical energy are both based on the first-instance size of the biological tissue;
• detect an in-process parameter during applying the first-instance electrical energy to the biological tissue, wherein the in-process parameter is (i) a value of in-process impedance of the biological tissue, (ii) a rate of change of the in-process impedance of the biological tissue, (iii) a value of in-process integrated power delivered to the biological tissue, or (iv) a combination thereof;
• determine a second-instance size of the biological tissue based on the detected in-process parameter;
• and
• apply a second-instance electrical energy to the biological tissue, wherein a value of voltage of the second-instance electrical energy and a length of time of application of the second-instance electrical energy are both based on the second-instance size of the biological tissue.