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US 2025/0025226 A1Published application
Bipolar electrosurgical instruments
AssigneeGyrus Medical Limited
InventorsWayne WILLIAMS, Lewis JONES
Life of this patent
Estimating the term…
Abstract
A bipolar surgical instrument comprises a body, first and second opposed jaws located at the distal end of a shaft, the first jaw being movable with respect to the second jaw between an open position in which the first and second jaws are spaced apart from one another, and a closed position in which the first and second jaws are adjacent one another. The first and second elongate jaw members have respective first and second electrodes. A controller is operable to determine a starting voltage for application to the jaws.
Claims12
An electrosurgical system comprising:
- a bipolar electrosurgical instrument comprising:
- a body;
- an elongate shaft attached to the body, the elongate shaft extending to a distal end;
- first and second elongate jaw members at the distal end of the elongate shaft, the first elongate jaw member carrying a first electrode and the second elongate jaw member carrying a second electrode, the jaw members being movable relative to one another between an open position in which the first and second electrodes are spaced apart from one another and a closed position in which the first electrode is adjacent the second electrode to engage tissue;
- a power cable comprising a pair of electrically conductive elements, and comprising a first end for connection with a source of radio frequency electromagnetic energy and a second end for connection to the first and second electrodes;
- and
- a waveform generator connectable to the power cable and comprising:
- a radio frequency signal generator configured to supply a radio frequency signal to the first and second electrodes via the power cable;
- and
- a controller configured to control operation of the radio frequency signal generator,
- wherein the controller is configured to:
- control the radio frequency generator, during an initiation stage, prior to tissue heating and sealing stages, in which characteristics of the tissue are not intended to be substantially altered, to supply the radio frequency signal of a predetermined constant power level to the first and second electrodes for a predetermined time period comprising an end time, and to measure a voltage level between the first and second electrodes at the end time, the voltage level being stored as a starting voltage for subsequent supply of radio frequency signals to the first and second electrodes, and
- during the tissue sealing stage performed immediately after the tissue heating stage, ramp up an applied voltage throughout the tissue sealing stage, the applied voltage starting from a final voltage of the tissue heating stage and ramping up at a rate faster than a ramp up rate during the tissue heating stage
10 more elements
An electrosurgical system comprising:
- a bipolar electrosurgical instrument comprising:
- a body;
- an elongate shaft attached to the body, the elongate shaft extending to a distal end;
- first and second elongate jaw members at the distal end of the elongate shaft, the first elongate jaw member carrying a first electrode and the second elongate jaw member carrying a second electrode, the jaw members being movable relative to one another between an open position in which the first and second electrodes are spaced apart from one another and a closed position in which the first electrode is adjacent the second electrode to engage tissue;
- a power cable comprising a pair of electrically conductive elements, and comprising a first end for connection with a source of radio frequency electromagnetic energy and a second end for connection to the first and second electrodes;
- and
- a waveform generator connectable to the power cable and comprising:
- a radio frequency signal generator configured to supply a radio frequency signal to the first and second electrodes via the power cable;
- and
- a controller configured to control operation of the radio frequency signal generator,
- wherein the controller is configured to control the radio frequency generator, during an initiation stage, prior to tissue heating and sealing stages, in which characteristics of the tissue are not intended to be substantially altered, to supply the radio frequency signal of a predetermined constant power level to the first and second electrodes for a predetermined time period comprising an end time, and to measure a voltage level between the first and second electrodes at the end time, the voltage level being stored as a starting voltage for subsequent supply of radio frequency signals to the first and second electrodes, and
- wherein the tissue sealing stage includes a size detection process whereby the controller is configured to, at an end of a hold time period, measure an impedance of the vessel and compare the measured impedance to a threshold impedance to thereby determine whether a vessel size is small or large.
9 more elements
An electrosurgical system comprising:
- a bipolar electrosurgical instrument comprising:
- a body;
- an elongate shaft attached to the body, the elongate shaft extending to a distal end;
- first and second elongate jaw members at the distal end of the elongate shaft, the first elongate jaw member carrying a first electrode and the second elongate jaw member carrying a second electrode, the jaw members being movable relative to one another between an open position in which the first and second electrodes are spaced apart from one another and a closed position in which the first electrode is adjacent the second electrode to engage tissue;
- a power cable comprising a pair of electrically conductive elements, and comprising a first end for connection with a source of radio frequency electromagnetic energy and a second end for connection to the first and second electrodes;
- and
- a waveform generator connectable to the power cable and comprising:
- a radio frequency signal generator configured to supply a radio frequency signal to the first and second electrodes via the power cable;
- and
- a controller configured to control operation of the radio frequency signal generator,
- wherein the controller is configured to:
- control the radio frequency generator, during an initiation stage, prior to tissue heating and sealing stages, in which characteristics of the tissue are not intended to be substantially altered, to supply the radio frequency signal of a predetermined constant power level to the first and second electrodes for a predetermined time period comprising an end time, and to measure a voltage level between the first and second electrodes at the end time, the voltage level being stored as a starting voltage for subsequent supply of radio frequency signals to the first and second electrodes, and
- monitor for open circuit faults by determining whether an impedance measurement is above a threshold value for an impedance predetermined time period.
10 more elements
Dependencies are inferred from the claim text.