# US 11,998,260 B2 · Low-power tissue sealing device and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,260 B2 - Document ID: US11998260B2 - Status: Granted - Kind: B2 - Application number: 17/866,320 - Filed: 2022-07-15 - Published: 2022-11-17 - Granted: 2024-06-04 - Earliest claimed: 2010-06-07 - Assignees: Bolder Surgical, LLC - Applicants: Bolder Surgical, LLC - Inventors: Jenifer Kennedy; Dale Schmaltz; David Schechter; Joel Helfer; David Ross - Web page: https://patentgrep.com/patent/US11998260B2 ## CPC - A61B 18/1233: {with circuits for assuring patient safety} - A61B 18/1206: {Generators therefor} - A61B 18/1445: {at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod} - A61B 18/1482: {having a long rigid shaft for accessing the inner body transcutaneously in minimal invasive surgery, e.g. laparoscopy} - A61B 2017/00141: {continuous, e.g. wave} - A61B 2018/00607: {Coagulation and cutting with the same instrument} - A61B 2018/00619: {Welding} - A61B 2018/0063: {Sealing} - A61B 2018/00642: {with feedback, i.e. closed loop control} - A61B 2018/00678: {upper} - A61B 2018/00702: {Power or energy} - A61B 2018/00708: {switching the power on or off} - A61B 2018/0072: {Current} - A61B 2018/00767: {Voltage} - A61B 2018/00875: {Resistance or impedance} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An electrosurgical instrument has a power supply operatively coupled to an end effector. The end effector has a pair of jaws for effectuating an action on tissue positioned therebetween. The power supply is configured to input a first signal and a second signal to a buck-boost converter. The buck-boost converter is configured to transmit an output to an H-bridge circuit. The H-bridge circuit is configured to pass a signal to a resonant LC transformer circuit. The power supply is configured to transmit a power signal. The pair of jaws are operatively coupled to the power supply to receive the power signal, the power having no more than 80 Volts RMS, and less than 2 Amps RMS. The power is configured to seal the tissue positioned between the pair of jaws in 3 seconds or less. ## Claims ### Claim 1 An electrosurgical generator, comprising: a power supply configured for generating non-pulsing radiofrequency (RF) power having an output voltage and an output current; and control circuitry configured to control delivery of the non-pulsing RF power to tissue being sealed by a tissue sealing device electrically connected to the generator, the non-pulsing RF power being delivered for a limited period of time, wherein the limited period of time is no greater than 5 seconds and begins upon delivery of the non-pulsing RF power to the tissue, and wherein the control circuitry is configured to hold the output current under 2 Amperes root mean square (RMS), and to hold the output voltage under 100 Volts RMS, respectively, throughout the limited period of time. ### Claim 2 (depends on 1) The electrosurgical generator of claim 1, wherein the tissue is a portion of a blood vessel. ### Claim 3 (depends on 1) The electrosurgical generator of claim 1, wherein the tissue sealing device comprises a conductive sealing surface, and wherein the control circuitry is configured to deliver the non-pulsing RF power to the tissue being sealed at a current density that is not greater than 0.1 Amperes per square millimeter of the sealing surface. ### Claim 4 (depends on 1) The electrosurgical generator of claim 1, wherein the control circuitry is configured to hold the non-pulsing power under a first maximum power when the impedance of the tissue is less than an impedance threshold, and to hold the non-pulsing power under a second maximum power lower than the first maximum power when the impedance of the tissue is greater than the threshold impedance. ### Claim 5 (depends on 4) The electrosurgical generator of claim 4, wherein the second maximum power is between 60% to 80% of the first maximum power. ### Claim 6 (depends on 1) The electrosurgical generator of claim 1, wherein the control circuitry is configured to hold the non-pulsing power under a first maximum power for an initial time interval of the limited period of time, and to hold the non-pulsing power under a second maximum power lower than the first maximum power after the initial time interval. ### Claim 7 (depends on 6) The electrosurgical generator of claim 6, wherein the second maximum power is between 60% to 80% of the first maximum power. ### Claim 8 (depends on 6) The power control system of claim 6, wherein the initial time interval is no greater than 2 seconds. ### Claim 9 (depends on 1) The electrosurgical generator of claim 1, wherein the impedance indicating that the tissue is sealed is between 180 ohms and 350 ohms. ### Claim 10 An electrosurgical vessel sealing system, comprising: a power supply configured for generating non-pulsing radiofrequency (RF) power having an output voltage and an output current; a vessel sealing device including an end effector; and control circuitry configured to control delivery of the non-pulsing RF power to the end effector for a limited period of time, wherein the end effector is configured to grasp and seal a portion of a blood vessel by conducting the non-pulsing RF power through the blood vessel portion; wherein the limited period of time is no greater than 5 seconds and begins upon delivery of the non-pulsing RF power to the blood vessel portion, and wherein the control circuitry is configured to hold the output current under 2 Amperes root mean square (RMS), and to hold the output voltage under 100 Volts RMS, respectively, throughout the limited period of time. ### Claim 11 (depends on 10) The electrosurgical system of claim 10, wherein the tissue sealing device comprises a conductive sealing surface, and wherein the control circuitry is configured to deliver the non-pulsing RF power to the tissue being sealed at a current density that is not greater than 0.1 Amperes per square millimeter of the sealing surface.