Electrosurgical System Impedance Control
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Solution Overview
Problem
Existing electrosurgical systems face challenges in simplifying the application process for coagulating tissue, particularly in maintaining optimal tissue impedance during high-frequency surgery.
Innovation Solution
An electrosurgical system that includes a bipolar instrument with a shaft, first and second electrodes at the distal end, a high-frequency generator, an impedance measuring device, and a liquid feeding device. The system measures tissue impedance and controls the dispensation of a conductive liquid to maintain optimal impedance, ensuring sufficient conductive liquid is present for effective tissue coagulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a bipolar electrosurgical instrument is used for tissue coagulation, then tissue coagulation is achieved, but the application process is complex and requires manual monitoring of tissue impedance
Solution Approach 1:
The system automatically measures tissue impedance and controls liquid dispensation without requiring manual intervention. The control device autonomously adjusts the quantity of conductive liquid based on real-time impedance measurements, allowing the system to self-regulate and simplify the application process while maintaining optimal coagulation conditions
Solution Approach 2:
The impedance measuring device continuously monitors tissue impedance and provides feedback to the control device, which automatically adjusts liquid dispensation accordingly. This closed-loop feedback system eliminates the need for manual impedance monitoring and simplifies operation while maintaining precise control over coagulation parameters
2Quantity of substance
If manual liquid dispensation is used, then conductive liquid is provided to the treatment site, but the quantity of liquid is not precisely controlled
Solution Approach 1:
The system uses real-time impedance measurements as feedback to automatically control the quantity of conductive liquid dispensed. The control device adjusts liquid flow based on measured impedance values, ensuring precise control over both the quantity of liquid and the resulting tissue impedance without requiring manual estimation or measurement
Solution Approach 2:
The system replaces manual mechanical liquid dispensation with an automated control system that uses electrical impedance measurements to regulate liquid flow. This substitution of mechanical control with an automated sensor-actuator system enables precise control over liquid quantity and tissue impedance that cannot be achieved through manual operation alone
3Stability of the object's composition
If sufficient conductive liquid is not present, then tissue impedance becomes unstable, but adding excessive liquid increases application complexity
Solution Approach 1:
The impedance measuring device continuously monitors tissue impedance stability and provides feedback to the control device, which automatically adjusts liquid dispensation to maintain optimal impedance levels. This feedback mechanism ensures stable tissue impedance without requiring the operator to manually monitor or adjust liquid quantity, simplifying the application process while maintaining composition stability
Solution Approach 2:
The system autonomously maintains stable tissue impedance by automatically regulating liquid dispensation based on real-time impedance measurements. The control device self-adjusts the quantity of conductive liquid without external intervention, ensuring stable tissue composition while keeping the application process simple and automated
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 improves tissue coagulation by maintaining optimal tissue impedance, reducing application time, and enabling treatment of larger coagulation zones with higher average performance of the high-frequency generator.
Implementation Method 1
an impedance measuring device for measuring the impedance of an object arranged at the distal end of the shaft of the bipolar electrosurgical instrument is provided
Implementation Method 2
the high-frequency current flows from the one electrode via the tissue to be treated to the other electrode of the bipolar electrosurgical instrument
Implementation Method 3
During high-frequency surgery, a high-frequency alternating currency is conducted through tissue which is to be treated surgically in order, for example, to deliberately damage or cut said tissue
Data Source
AI summary
An electrosurgical system includes a liquid feeding device for feeding a quantity of liquid to the distal end of a shaft of a bipolar electrosurgical instrument, an impedance measuring device for measuring the impedance of an object arranged at the distal end of the shaft, and a control device that is connected to the impedance measuring device and the liquid feeding device and is configured to control and/or dose the quantity of liquid fed by the liquid feeding device to the distal end of the shaft as a function of the measurement of the impedance measured by the impedance measuring device.