Ectopic Signal Detection for Safe PEF Ablation
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Solution Overview
Problem
During cardiac applications of pulsed electric field ablation, high voltage pulses can cause complications such as induced arrhythmias if delivered during certain periods of cardiac activity, necessitating synchronization with the cardiac cycle to avoid these risks.
Innovation Solution
A system and method for detecting ectopic cardiac activity using a cardiac stimulator and pacing device to synchronize ablation energy delivery with the cardiac cycle, ensuring that high voltage pulses are only delivered during a refractory period, thereby reducing the risk of arrhythmias like atrial and ventricular fibrillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high voltage pulses are delivered during cardiac ablation, then ablation effectiveness is improved, but the risk of induced arrhythmias increases
Solution Approach 1:
The system performs preliminary detection of ectopic cardiac activity using ECG signal analysis before delivering ablation pulses. By identifying ectopic beats and T-waves in advance, the system can prevent pulse delivery during hazardous periods, thereby maintaining ablation effectiveness while reducing arrhythmia risk
Solution Approach 2:
The system continuously monitors ECG signals during the ablation procedure and uses real-time feedback to adjust pulse delivery timing. When ectopic activity or T-waves are detected, the feedback mechanism modifies the ablation pulse timing to avoid delivering energy during vulnerable cardiac periods, thus balancing treatment efficacy with safety
2Reliability
If ablation pulses are synchronized with the cardiac cycle, then arrhythmia risk is reduced, but the window for safe pulse delivery is limited
Solution Approach 1:
The system dynamically adjusts the timing and duration of ablation pulse delivery based on real-time detection of safe windows in the cardiac cycle. By continuously monitoring ECG features and adapting pulse delivery to the instantaneous cardiac state, the system maximizes the usable delivery window while maintaining safety
Solution Approach 2:
The system utilizes the periodic nature of the cardiac cycle to identify repeating safe windows for pulse delivery. By synchronizing with the natural rhythm and detecting periodic ECG features, the system can reliably identify when safe delivery opportunities arise, maximizing productivity within safety constraints
3Reliability
If ectopic activity is detected and ablation is interrupted, then fibrillation risk is reduced, but procedure time increases
Solution Approach 1:
The system performs preliminary identification of ectopic beats and safe delivery windows before ablation pulse delivery. By detecting ectopic activity in advance and pre-planning pulse timing around these events, the system minimizes interruptions and reduces overall procedure time while maintaining safety
Solution Approach 2:
The system dynamically adapts the ablation delivery schedule in response to detected ectopic activity, smoothly transitioning between pulse delivery and monitoring modes. This dynamic adjustment minimizes idle time and ensures that procedure interruptions are brief and necessary, reducing overall time loss
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 reduces the risk of inducing fibrillation by ensuring that ablation energy is delivered only when ectopic activity is not present, thereby enhancing the safety and effectiveness of the ablation process.
Implementation Method 1
Application of brief ultra-short high voltage pulses to tissue may generate high electric fields in tissue to generate a local region of ablated tissue by the biophysical mechanism of irreversible electroporation
Implementation Method 2
measuring electrical cardiac activity (e.g., an electrocardiogram (ECG) signal) to detect pacing capture and/or ectopic cardiac activity
Data Source
AI summary
Systems, apparatus, and methods for ablation therapy are described herein, with a processor for confirming pacing capture or detecting ectopic beats. An apparatus includes a processor for receiving cardiac signal data captured by a set of electrodes, extracting a sliding window of the cardiac signal data, identifying a peak frequency over a subrange of frequencies associated with the extracted sliding window, detecting ectopic activity based at least on a measure of the peak frequency over the subrange of frequencies, in response to detecting ectopic activity, sending an indication of ectopic activity to a signal generator configured to generate pulsed waveforms for cardiac ablation such that the signal generator is deactivated or switched off from generating the pulsed waveforms. An apparatus can further include a processor for confirming pacing capture of the set of pacing pulses based on cardiac signal data.