Electrosurgical Instrument Timer-Controlled Impedance Switching
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Solution Overview
Problem
Bipolar electrosurgical instruments face limitations in safety and compatibility with various electrosurgical generators, leading to potential tissue damage and the need for costly, specialized equipment.
Innovation Solution
Incorporating a timer-controlled circuit that periodically switches the electrosurgical instrument between measurement and operating modes to monitor impedance and adjust power delivery, allowing for safe and flexible operation with conventional generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bipolar electrosurgical instruments use automatic tissue resistance sensing and voltage adjustment, then patient safety is improved, but device complexity increases
Solution Approach 1:
The patent implements automatic tissue resistance sensing that continuously monitors impedance between electrodes and provides feedback to the control circuit. This feedback mechanism enables real-time detection of tissue contact and cutting status, allowing the system to automatically adjust voltage and terminate power delivery when cutting is complete, thereby improving patient safety through closed-loop control
Solution Approach 2:
The electrosurgical instrument performs self-monitoring and self-regulation by automatically detecting tissue resistance changes and adjusting its own operating parameters. The measurement unit continuously assesses impedance between electrodes, and the control circuit autonomously terminates power delivery when cutting is complete, eliminating the need for manual intervention and reducing dependency on external monitoring equipment
2Adaptability or versatility
If hospitals purchase specialized electrosurgical generators for each instrument type, then instrument compatibility is improved, but equipment cost increases
Solution Approach 1:
The patent designs the electrosurgical instrument with a universal interface and control circuit that can operate with multiple types of electrosurgical generators. The measurement unit and timer circuit are integrated into the instrument itself, allowing it to function independently of the specific generator model, thereby enabling a single instrument design to be compatible across different generator platforms and reducing the need for specialized equipment purchases
3Measurement precision
If the electrosurgical instrument continuously monitors impedance, then cutting completion detection is improved, but power consumption increases
Solution Approach 1:
The patent employs a timer circuit that periodically controls the switching between measurement mode and operating mode rather than continuous monitoring. The measurement unit activates at periodic intervals to assess impedance and detect cutting completion, then remains inactive between measurements. This periodic operation maintains accurate cutting detection capability while significantly reducing average power consumption compared to continuous monitoring
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
Enhances patient safety by quickly terminating power delivery when tissue is cut or coagulated, preventing unintended tissue damage and allowing compatibility with a wide range of electrosurgical generators, thereby reducing equipment costs.
Implementation Method 1
the measurement unit measures the impedance between the electrodes
Implementation Method 2
the electrosurgical generator applies a voltage over the electrodes
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3d
AI summary
A method of operating a electrosurgical instrument connected to an electrosurgical generator and comprising a circuit, a measurement unit and at least two electrodes, where the circuit controls a switching of the electrosurgical instrument between a measurement mode, where the measurement unit measures the impedance between the electrodes, and an operating mode, where the electrosurgical generator applies a voltage over the electrodes. The circuit comprises a timer that periodically controls the switching of the electrosurgical instrument between the measurement mode and the operating mode. An inexpensive electrosurgical instrument for use with most conventional electrosurgical generators as well as with electrosurgical generators specifically designed for use with said instrument is proposed.