Impedance Matching Circuit for Medical Electrode Assemblies
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Solution Overview
Problem
Conventional energy-based medical systems face inefficiencies due to impedance imbalances between the system and patient tissue, leading to reflected power and excess energy consumption, especially when switching between differently sized electrodes.
Innovation Solution
The development of energy-based electrode assemblies and handpieces with impedance matching circuits and elements, such as inductors, capacitors, and resistors, that can dynamically adjust to match the impedance of various electrodes, ensuring efficient energy transfer and minimizing impedance mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional signal generators use fixed impedance elements to match system impedance, then impedance balance is achieved for specific electrode configurations, but the system cannot efficiently handle a full range of working electrodes with different impedances
Solution Approach 1:
The patent implements dynamic impedance adjustment by incorporating a microprocessor that automatically detects electrode impedance and selects appropriate conjugate impedance values from a stored database. This allows the system to adapt to different electrode types and sizes in real-time, eliminating reflected power across a full range of working electrodes without requiring manual reconfiguration of impedance elements
Solution Approach 2:
The system changes the impedance parameter dynamically by storing multiple conjugate impedance values in a database and selecting the appropriate value based on detected electrode characteristics. This enables the signal generator to maintain optimal impedance matching across various electrode configurations, preventing energy loss while accommodating different electrode types
2Reliability
If conventional systems manually adjust impedance elements when changing electrodes, then impedance matching can be achieved, but the response time is slow and reduces productivity
Solution Approach 1:
The patent implements self-service impedance matching through an automatic detection and selection system. The microprocessor automatically detects the impedance characteristics of the connected electrode, queries the database for the appropriate conjugate impedance value, and configures the signal generator without requiring manual intervention. This eliminates the slow manual adjustment process while maintaining accurate impedance matching, thereby improving productivity during electrode changeovers
Solution Approach 2:
The system uses feedback from impedance detection to automatically select and apply the correct conjugate impedance value. The microprocessor continuously monitors electrode characteristics and adjusts the signal generator's output impedance accordingly, ensuring reliable impedance matching while enabling rapid electrode changes without manual intervention
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 solution enables efficient and rapid impedance matching, reducing energy wastage and improving the operational efficiency of energy-based medical systems, regardless of the electrode size or type used, thereby enhancing treatment efficacy and reliability.
Implementation Method 1
The dielectric portion is adapted to be arranged between the conductive portion and the tissue such that treatment energy is transmitted from the conductive portion through the dielectric portion for capacitively coupling with tissue to perform a non-invasive tissue treatment
Implementation Method 2
By definition, an impedance match is achieved when the overall net system reactance components are eliminated. If the impedances along the energy transmission path are not balanced, energy may be reflected within the energy transmission path
Data Source
AI summary
Electrode assemblies and handpieces for energy-based treatment systems that utilize an impedance assembly to facilitate impedance matching between the system and a patient. The electrode assembly and/or handpiece may include one or more circuit elements configured to introduce at least one supplemental impedance into an electrical circuit coupling the electrode assembly and handpiece. The supplemental impedance, which is related to the impedance of the treatment system and patient, is introduced when the electrode assembly is coupled with the handpiece.