Impedance-Based Microbubble Detection in Catheter Ablation
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Solution Overview
Problem
Current radiofrequency ablation devices lack a method to detect microbubble formation during procedures, which can lead to overheating and dangerous bubble formation due to closely spaced electrodes, and existing methods do not provide a mechanism for detecting this issue effectively.
Innovation Solution
A method and system that measure impedance between electrodes during radiofrequency ablation, terminating energy transmission when impedance exceeds a predetermined percentage above a minimum impedance and power threshold, and generating an alert for microbubble formation or release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple treatment electrodes are positioned close to one another to treat cardiovascular tissues, then treatment effectiveness is improved, but microbubble formation occurs causing overheating and safety issues
Solution Approach 1:
The system performs preliminary impedance measurements before and during RF energy transmission to detect microbubble formation early. By measuring impedance at predetermined time intervals and comparing against threshold values, the system can terminate energy transmission before dangerous overheating occurs, preventing the harmful effect while maintaining treatment effectiveness.
Solution Approach 2:
The system continuously monitors impedance during RF energy transmission and uses this feedback to determine when to terminate treatment. The impedance measurements provide real-time information about microbubble formation, allowing the control system to adjust or stop energy delivery to prevent overheating while maintaining effective treatment when conditions are safe.
2Measurement precision
If impedance measurement is performed continuously to detect microbubble formation, then detection accuracy is improved, but device complexity and measurement interference increase
Solution Approach 1:
The system performs impedance measurements at predetermined time intervals during RF energy transmission rather than continuously. This periodic measurement approach provides sufficient detection accuracy to identify microbubble formation while reducing device complexity and minimizing interference with the treatment process compared to continuous monitoring.
Solution Approach 2:
The system measures impedance at specific critical time points during the RF transmission cycle rather than throughout the entire process. By focusing measurements at predetermined intervals when microbubble formation is most likely to occur, the system achieves adequate detection precision with reduced measurement activity, lowering device complexity and interference.
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
Effectively detects and prevents microbubble formation by terminating radiofrequency energy transmission when predetermined impedance and power thresholds are met, reducing the risk of overheating and ensuring safe operation.
Implementation Method 1
A control unit is included and operable to measure an impedance of a first pair of the plurality of electrode pairs
Implementation Method 2
The presence of a high current density between the closely spaced electrodes causes overheating and production of large volume of bubbles surrounding the electrodes
Implementation Method 3
transmit radiofrequency ablation energy between the plurality of electrode pairs
Data Source
AI summary
A method and system for detecting microbubble formation during a radiofrequency ablation procedure. The method includes measuring an impedance of a pair of electrodes, at least one electrode in the pair of electrodes being coupled to a treatment assembly of a medical device. Radiofrequency ablation energy is transmitted between the pair of electrodes. The transmission of radiofrequency ablation energy between the pair of electrodes is terminated when after a predetermined period of time the measured impedance in either of the electrodes in the pair of electrodes is a predetermined percentage above a measured minimum impedance and a measured power is above a predetermined power threshold. An alert is generated indicating at least one of the formation and release of microbubbles proximate the pair of electrodes.