Superimposed Waveforms for Reduced-Heating Pulsed Field Ablation
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Solution Overview
Problem
Existing ablation therapies face challenges in achieving efficient tissue ablation with minimal thermal heating, muscle contractions, and reduced likelihood of sustained arrhythmias, while optimizing lesion size and energy delivery.
Innovation Solution
A system and method involving a catheter with multiple electrodes and a pulse generator that superimposes two waveforms onto one another to create a combined waveform for electroporation therapy, utilizing irreversible electroporation to cause cell death through plasma membrane disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage pulses are applied for tissue ablation, then cell death and lesion formation are achieved, but thermal heating of tissue increases
Solution Approach 1:
The patent applies periodic pulsed electric fields with specific pulse durations (100 microseconds to 10 milliseconds) and repetition rates (1 Hz to 100 Hz) to achieve irreversible electroporation. The pulsed nature allows tissue to cool between pulses, preventing thermal accumulation while maintaining effective cell membrane disruption through repeated cyclic electric field application.
Solution Approach 2:
The patent optimizes multiple electric field parameters including pulse duration, voltage amplitude (200V to 2000V), pulse repetition rate, and waveform shape (biphasic, monophasic, exponential) to achieve effective ablation at lower temperatures. By adjusting these parameters, the system achieves cell death through electroporation rather than thermal mechanisms, directly reducing tissue heating.
2Manufacturing precision
If higher energy pulses are delivered to achieve complete ablation, then lesion size increases, but muscle contractions are induced
Solution Approach 1:
The patent uses specific pulse duration ranges (100 microseconds to 10 milliseconds) and voltage levels (200V to 2000V) that are optimized to achieve irreversible electroporation in cardiac tissue without reaching the threshold for skeletal muscle contraction. The bipolar waveform configuration and controlled pulse repetition rates further refine the electric field delivery to selectively affect cardiac tissue while sparing surrounding musculature.
Solution Approach 2:
The patent employs bipolar electrode configurations where positive and negative electrodes are positioned in specific spatial relationships to create localized electric field patterns. This allows the electric field to be concentrated in the target cardiac tissue region while minimizing field strength in surrounding muscle areas, achieving localized ablation without systemic muscle contractions.
3Reliability
If multiple therapy applications are used to achieve complete ablation, then arrhythmia risk decreases, but procedure time increases
Solution Approach 1:
The patent employs continuous trains of electric field pulses delivered at optimized repetition rates (1 Hz to 100 Hz) that maintain effective electroporation throughout the treatment duration. This continuous pulsed delivery ensures complete and uniform lesion formation across the target tissue, reducing the need for multiple separate therapy applications and thereby shortening overall procedure time while maintaining arrhythmia prevention effectiveness.
Solution Approach 2:
The patent uses periodic pulse trains with specific duration and repetition characteristics that achieve complete ablation in fewer applications compared to lower frequency pulsing. The optimized pulse timing and repetition rate ensure that each therapy application is sufficiently effective, reducing the total number of applications needed and consequently reducing procedure time while maintaining reliable arrhythmia prevention.
4Temperature
If pulsed field ablation is used to minimize thermal effects, then tissue heating is reduced, but the complexity of waveform control increases
Solution Approach 1:
The patent implements standardized periodic pulse waveforms with pre-determined parameters (pulse duration, repetition rate, voltage amplitude) that simplify control system design. These standardized periodic patterns are easier to generate and control compared to complex aperiodic waveforms, reducing device complexity while maintaining effective thermal management through the inherent cooling periods between pulses.
Solution Approach 2:
The patent focuses on controlling a limited set of key parameters (pulse duration, voltage amplitude, repetition rate) rather than complex waveform characteristics. This parameter-based control approach simplifies the waveform generation and control system compared to methods requiring precise control of multiple waveform features, reducing device complexity while achieving effective thermal management through optimized parameter selection.
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 approach enables efficient tissue ablation with reduced thermal effects, shorter procedure times, and minimized muscle contractions, while achieving consistent lesion formation and reducing the risk of arrhythmias.
Implementation Method 1
PFA generally involves delivering high voltage pulses from electrodes disposed on a catheter. For example, voltage pulses may range from less than about 500 volts to about 2400 volts or higher. These fields may be applied between pairs of electrodes (bipolar therapy) or between one or more electrodes and a return patch (monopolar therapy).
Data Source
AI summary
An electroporation system is provided. The system includes a catheter including a plurality of electrodes, and a pulse generator coupled to the catheter. The pulse generator is configured to generate a first waveform to be delivered between at least one active electrode on the catheter and at least one first return electrode, generate a second waveform to be delivered between the at least one active electrode and at least one second return electrode, and cause delivery of the first and second waveforms over the same time period such that at least the first and second waveforms are superimposed onto one another to create a combined waveform at the at least one active electrode.