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

Claim 11:
12. 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 connected to the electrosurgical instrument configured to supply RF energy to the electrosurgical instrument, comprising:
at least one sensor configured to measure at least one characteristic associated with the tissue being grasped for a pre-determined period of time,
an RF amplifier that is configured to generate an amount of RF energy for the electrosurgical instrument, and
a controller that is configured to:
calculate a plurality of thresholds based on the at least one characteristic measured by the at least one sensor, wherein each of the plurality of thresholds is calculated by the controller using both a percentage from the at least one measured characteristic and a static offset from the at least one measured characteristic,
determine that at least one threshold has been crossed by subsequent measurements from the at least one sensor, and
instruct the RF amplifier to modify the RF energy being generated responsive to the at least one threshold being crossed to avoid tissue complications caused from excessive RF energy application to the tissue,

wherein the RF amplifier initially generates RF energy in a ramping manner for an initial period of time, wherein the ramping manner is based on a type of tissue being fused or sealed, and wherein the at least one sensor monitors the at least one characteristic for a maximum value or peak during the initial period of time corresponding to an RF output peak,
wherein an increase in the amount of RF energy corresponding to the ramping manner for a thicker tissue is measured at 2750 mA over a period of 100 milliseconds, and
wherein the increase in the amount of RF energy corresponding to the ramping manner of a thinner tissue is measured at 5500 mA over a period of 50 milliseconds.