High-Frequency Power Supply Impedance Feedback Control
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Solution Overview
Problem
Existing high-frequency treatment systems face challenges in precisely adjusting output voltage and current to optimize treatment efficiency and precision, as optimal settings vary with the treatment target and tissue impedance changes during procedures.
Innovation Solution
An electric power source device with a control circuit that acquires initial impedance values, adjusts output voltage based on impedance increase rates, and terminates specific treatment phases when impedance reaches minimum values, ensuring optimized output for the treatment target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If output voltage and current are adjusted manually or using fixed parameters, then the treatment process is simple to control, but the treatment precision and efficiency cannot be optimized for different tissue targets
Solution Approach 1:
The system continuously monitors tissue impedance during the treatment process and uses this feedback to dynamically adjust output voltage and current. The control circuit compares real-time impedance values with target impedance values and modifies power delivery accordingly, enabling precise adaptation to different tissue targets without increasing operational complexity for the user.
Solution Approach 2:
The system automatically changes electrical parameters (voltage, current, impedance thresholds) based on detected tissue characteristics. By measuring initial impedance and tracking impedance changes over time, the system adapts power delivery parameters to match optimal values for different tissue types and treatment stages, achieving high precision without manual intervention.
2Strength
If the treatment duration is extended to ensure complete sealing, then sealing strength improves, but treatment time increases and productivity decreases
Solution Approach 1:
The system monitors tissue impedance as a real-time indicator of sealing progress. When impedance reaches a predetermined target value or maintains it for a specified duration, the control circuit automatically terminates power delivery. This feedback mechanism ensures sufficient sealing strength is achieved while preventing unnecessary extension of treatment time, thereby optimizing both quality and productivity.
Solution Approach 2:
The system performs preliminary measurement of initial tissue impedance before beginning power delivery. Based on this initial value, the control circuit pre-calculates appropriate treatment parameters and target impedance thresholds, allowing the treatment to proceed directly to optimal completion points without trial-and-error extensions, thus improving efficiency while maintaining sealing quality.
3Reliability
If high-frequency power is continuously applied to ensure treatment effectiveness, then treatment reliability improves, but tissue damage from overheating increases
Solution Approach 1:
The system continuously monitors tissue impedance, which serves as an indirect indicator of tissue temperature and thermal state. Impedance changes reflect tissue heating and structural changes in real-time. The control circuit uses this feedback to detect when target impedance is reached or exceeded, automatically reducing or terminating power delivery to prevent overheating, thus maintaining treatment reliability while avoiding thermal damage.
Solution Approach 2:
The system applies high-frequency power in controlled intervals rather than continuous delivery. Power is delivered, impedance is monitored, and delivery is paused or terminated when target impedance is reached. This periodic approach ensures sufficient thermal energy is deposited for effective sealing while allowing brief intervals to prevent excessive temperature rise, balancing reliability with tissue safety.
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 and efficient high-frequency treatment by stabilizing temperature and sealing strength, regardless of tissue thickness, while minimizing treatment time and variance in results.
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
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AI summary
An operation method of an electric power source device (200) for operating a high-frequency treatment instrument (100) configured to perform a high-frequency treatment on a biological tissue includes causing a high-frequency electric power source circuit to output electric power (S201); acquiring an initial impedance value in a first period from a start of the output (S202); determining an increase rate of an output voltage relative to time (S301); increasing the output voltage of the high-frequency electric power source circuit in accordance with the increase rate in a second period (S302); acquiring the value relating to impedance of the biological tissue in the second period (S303); and terminating the second period after the value relating to the impedance reaches a minimum value (S304).