Bipolar Electrosurgical Instrument Adaptive Sealing Control
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Solution Overview
Problem
Existing bipolar surgical instruments do not provide optimal transfer of electrical power to tissue, resulting in suboptimal tissue sealing times during surgical procedures.
Innovation Solution
A bipolar electrosurgical system with a controller that manages radio frequency energy delivery to electrodes on movable jaw members, using controlled voltage levels, impedance measurement, and adaptive operation stages to optimize sealing, including an initialisation stage, heating stage, sealing stage, and completion stage, to ensure efficient tissue sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing bipolar surgical instruments are used with standard radio frequency energy delivery, then the instrument structure remains simple, but the tissue sealing time is extended and sealing efficiency is reduced
Solution Approach 1:
The patent implements dynamic control of radio frequency energy delivery through multiple operation stages (initialisation, heating, sealing, completion) with adaptive voltage and power adjustments. The controller dynamically modifies energy parameters based on tissue response, transforming a static instrument into a dynamic system that optimizes sealing efficiency while managing complexity through structured control logic.
Solution Approach 2:
The patent changes multiple electrical parameters including voltage levels (starting voltage, final voltage, sealing voltage), power levels (initial power, controlled power), and frequency characteristics throughout different operation stages. These parameter changes enable optimized tissue sealing by adapting energy delivery to tissue impedance variations, directly addressing the sealing efficiency problem without requiring fundamental structural redesign.
2Loss of time
If higher radio frequency power is applied to reduce sealing time, then sealing speed improves, but the risk of short circuits and tissue damage increases
Solution Approach 1:
The patent implements preliminary actions including initialization stage with low power to establish baseline impedance, gradual voltage ramping before high power sealing, and pre-programmed control sequences. These preliminary actions prepare the tissue and system for high power delivery, reducing the risk of short circuits while enabling faster sealing when appropriate power levels are safely applied.
Solution Approach 2:
The patent incorporates continuous impedance measurement and monitoring throughout all operation stages. The controller uses real-time impedance feedback to detect tissue changes, adjust power levels, and terminate sequences appropriately. This feedback mechanism enables safe high power delivery by immediately detecting abnormal conditions that could lead to short circuits or tissue damage.
3Manufacturing precision
If standard voltage levels are used throughout the sealing process, then the control system remains simple, but optimal tissue sealing cannot be achieved due to tissue impedance variations
Solution Approach 1:
The controller implements dynamic voltage adjustment across four distinct operation stages, transitioning from initialization voltage to heating voltage, then to sealing voltage, and finally to completion voltage. This dynamic control adapts to tissue impedance changes during sealing, ensuring consistent sealing quality while using structured stage-based logic to manage controller complexity.
Solution Approach 2:
The patent segments the sealing process into four distinct stages (initialisation, heating, sealing, completion), each with specific voltage and power parameters. This segmentation allows precise control at each phase while simplifying the overall control logic through modular stage management, addressing both sealing consistency and controller complexity.
4Measurement precision
If impedance measurement and adaptive control are implemented, then sealing precision improves, but the measurement and control system complexity increases
Solution Approach 1:
The controller performs multiple functions including impedance measurement, voltage control, power regulation, stage sequencing, and safety monitoring within a single integrated device. This multi-functionality reduces overall system complexity by consolidating measurement and control functions rather than requiring separate dedicated systems for each function.
Solution Approach 2:
The system uses the tissue itself as the measurement medium, with impedance measurements taken directly through the electrodes already in contact with tissue. The tissue's electrical properties provide self-service information about its state, eliminating the need for separate sensing mechanisms and reducing measurement system complexity while maintaining high precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves improved tissue sealing by dynamically controlling radio frequency energy delivery based on impedance measurements, ensuring efficient and consistent sealing processes, reducing sealing times and preventing short circuits or open circuits.
Implementation Method 1
Sealing is typically achieved using application of radio frequency energy delivered to the tissue being sealed by electrodes mounted on the opposed jaws of the instrument
Implementation Method 2
application of radio frequency energy delivered to the tissue being sealed
Implementation Method 3
to measure an impedance between the first and second electrodes during supply of the controlled voltage level
Data Source
AI summary
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 boiling point for tissue between the jaws using a measure of impedance therebetween.