Patent ID: 11963711
Assignee: APPLIED MEDICAL RESOURCES CORPORATION
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An electrosurgical system for fusing or sealing tissue, the system comprising:
an electrosurgical instrument configured to:
grasp tissue being sealed, and
transmit RF energy to an area of the tissue being grasped, wherein the transmitted RF energy is configured to fuse or seal the tissue being grasped; and

an electrosurgical generator that is connected to the electrosurgical instrument, wherein the electrosurgical generator supplies the electrosurgical instrument with the RF energy used to seal the tissue, and wherein the electrosurgical generator comprises:
a plurality of sensors configured to measure current associated with the tissue being grasped by the electrosurgical instrument, wherein the current being measured is responsive to the RF energy being transmitted to the tissue by the electrosurgical instrument,
an RF amplifier that is configured to:
generate an amount of RF energy as instructed by a controller, and
transmit the RF energy that was generated to the electrosurgical instrument; and

the controller that is configured to:
receive, from the plurality of sensors, the measured current for a pre-determined period of time, wherein the pre-determined period of time varies based on a type of the tissue undergoing sealing and is less than a total time required to seal the tissue,
identify a maximum current value and when the maximum current value occurred from the measured current over the pre-determined period of time,
generate a plurality of thresholds based on the maximum current value and when the maximum current value occurred that are used to characterize different conditions associated with the tissue, wherein each different condition dictates how much RF energy is needed to fuse or seal the tissue being grasped, and wherein each of the plurality of thresholds is calculated by the controller using a percentage of or a static offset from the measured maximum current value;
receive subsequent current measurements from the plurality of sensors, and
instruct the RF amplifier to modify the RF energy being generated based on the subsequent current measurements crossing one or more of the plurality of thresholds, the modified RF energy being generated corresponding to the condition of the tissue undergoing fusing or sealing configured to avoid excessive RF energy application to the tissue.