RF Generator Impedance Measurement for Electrode State Detection
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Solution Overview
Problem
Existing electrosurgical systems lack clear and accurate information regarding the state of the transseptal guidewire before applying RF energy for tissue puncture, leading to incomplete or vague data on electrical connections and electrode positions.
Innovation Solution
A radiofrequency generator system that includes a controller to measure impedance using a low-power, high-frequency test signal and determine the state of the active electrode based on these measurements, providing clear and accurate information on the electrode's position and connection status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF energy is applied for tissue puncture, then tissue puncture function is achieved, but accurate determination of electrode state is lacking
Solution Approach 1:
The system performs preliminary impedance measurements using test signals before applying RF energy for tissue puncture. The controller measures impedance of test signals at different power levels to determine electrode state (e.g., electrode-tissue contact, electrode position relative to dilator) before the actual puncture procedure, ensuring accurate information is obtained in advance
Solution Approach 2:
The system continuously monitors impedance of test signals and provides feedback to the controller, which interprets the impedance values to determine electrode state. This feedback mechanism allows real-time assessment of electrical connection quality and electrode positioning, enabling the operator to verify proper setup before and during the procedure
2Power
If high-power RF signal is used for puncture, then tissue puncture effectiveness is improved, but measurement of electrode state becomes difficult
Solution Approach 1:
The RF signal is segmented into different functional components: low-power test signals for impedance measurement and high-power RF signals for tissue puncture. The controller selectively applies test signals at reduced power levels specifically for measurement purposes, allowing accurate impedance determination without the interference of high-power RF energy
Solution Approach 2:
The system periodically alternates between applying test signals for impedance measurement and high-power RF signals for puncture. Test signals are applied at specific intervals to measure electrode state before and during the puncture procedure, ensuring measurement precision is maintained despite the presence of high-power RF delivery
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 effectively determines the state of the active electrode with high accuracy, ensuring proper electrical connections and optimal electrode positioning before applying RF energy, thereby improving the reliability and precision of tissue puncture procedures.
Implementation Method 1
measure an impedance of the test signal; determine a state of the active electrode based on the impedance measurement
Data Source
AI summary
A radiofrequency (RF) generator for use in a tissue puncture system for puncturing a tissue in a body is disclosed. The RF generator includes an RF energy source to couple to an active electrode of an RF puncture device and to couple to a return electrode and a controller coupled to the RF energy source. The controller causes the RF energy source to generate each of a puncture signal and a test signal, the test signal having a lower power than the puncture signal, measures an impedance of the test signal, determine a state of the active electrode based on the impedance measurement, and displays the state on a display device.