High-Frequency Power Source Impedance Control for Tissue Sealing
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Solution Overview
Problem
High-frequency treatment systems face challenges in precisely adjusting output voltage and current for biological tissues, as optimal settings vary with treatment targets and are influenced by impedance changes during procedures, affecting treatment precision and efficiency.
Innovation Solution
A method and device for a high-frequency power source system that dynamically adjusts output power based on measured impedance values, using a control circuit to set target impedance values that increase or decrease within predetermined periods, and adjust power output by fixed ratios to maintain optimal treatment conditions, terminating output when a stop impedance value is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the output voltage and current are adjusted to improve treatment precision, then the treatment precision improves, but the device complexity increases due to the need for dynamic impedance monitoring and control
Solution Approach 1:
The control circuit continuously monitors the impedance value during high-frequency output and compares it against a target impedance value. Based on this feedback, the control circuit dynamically adjusts the output voltage and current to maintain optimal treatment conditions, resolving the contradiction by enabling precise control through closed-loop feedback rather than complex open-loop control systems
Solution Approach 2:
The system automatically adjusts its own output parameters based on real-time impedance measurements without requiring external intervention. The control circuit self-regulates the high-frequency output by comparing measured impedance with target impedance and autonomously modifying voltage and current levels, simplifying the overall control architecture while maintaining treatment precision
2Adaptability or versatility
If the output is continuously adjusted to adapt to impedance changes, then the adaptability improves, but the loss of time increases due to frequent measurements and adjustments
Solution Approach 1:
The control circuit performs impedance measurements and output adjustments at predetermined time intervals rather than continuously. This periodic operation allows the system to adapt to impedance changes while minimizing the time spent on measurements and adjustments, balancing adaptability with treatment efficiency
Solution Approach 2:
The control circuit sets a target impedance value in advance that represents the optimal treatment condition. By having the target value predetermined, the system can quickly compare real-time measurements against this pre-set reference and make rapid adjustments, reducing the time required for decision-making while maintaining high adaptability
3Adaptability or versatility
If the impedance measurement range is expanded to cover all possible tissue types, then the adaptability improves, but the measurement precision decreases for specific tissue types
Solution Approach 1:
Instead of using a single broad impedance range for all tissue types, the system establishes different target impedance values specific to different treatment targets. The control circuit selects and applies the appropriate target impedance value based on the specific tissue being treated, enabling precise measurements and control for each tissue type while maintaining overall system versatility
Solution Approach 2:
The system changes the target impedance parameter according to the treatment target being processed. By adjusting the reference impedance value to match the specific characteristics of different tissue types, the system maintains high measurement precision across various applications without requiring a single overly broad measurement range that would compromise 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
This approach allows for precise control of high-frequency treatment, ensuring consistent and efficient sealing of biological tissues by adapting power output to impedance changes, thereby improving treatment precision and efficiency.
Implementation Method 1
the biological tissue grasped by the grasping members is heated by a high-frequency current flowing through the biological tissue
Data Source
AI summary
A method of operating a power source device for a high-frequency treatment instrument adapted to perform high-frequency treatment for biological tissue includes causing a high-frequency power source circuit to output power; setting a target impedance value which gradually increases from a change-over impedance value to a stop impedance value; regularly comparing a measured impedance value to the target impedance value; causing the high-frequency power source circuit to lower the power by a first ratio if the measured impedance value is greater than the target impedance value, and to raise the power by a second ratio if the measured impedance value is smaller than the target impedance value; and causing the high-frequency power source circuit to terminate the output upon the value for impedance reaching the stop impedance value.