Nanosecond Pulsed Electric Field Ablation for Cardiac Tissue
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Solution Overview
Problem
Current ablation methods for treating myocardial tissues, such as RF ablation and cryoablation, face challenges including high recurrence rates, thermal side effects, and lengthy procedure durations.
Innovation Solution
The use of nanosecond pulsed electric fields (nsPEFs) for ablating cardiac tissues, which involves applying intense electric fields for short durations using various electrode configurations, such as penetrating, endo-endo, and endo-epi configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF ablation is used to destroy myocardial tissue, then conduction-blocking lesions are created, but thermal side effects occur including thrombus formation, charring, steam pops, and thermal damage to adjacent tissues
Solution Approach 1:
The patent changes the fundamental parameter of ablation from thermal to non-thermal by using nanosecond pulsed electric fields instead of continuous RF heating. This allows tissue destruction through electroporation without the thermal side effects that plague RF ablation, directly resolving the contradiction between effectiveness and harmful thermal effects
Solution Approach 2:
The patent replaces the thermal mechanism (RF heating) with an electrical mechanism (nanosecond pulsed electric fields). This substitution eliminates the thermal diffusion problem inherent in RF ablation, creating precise non-thermal lesions without thermal damage to surrounding tissues
2Reliability
If RF ablation is used to create conduction-blocking lesions, then tissue destruction is achieved, but the procedure duration is lengthy
Solution Approach 1:
The patent uses nanosecond pulsed electric fields delivered in rapid sequences rather than continuous RF heating. Each pulse creates electroporation effects instantly, and multiple pulses can be delivered in succession without the thermal accumulation delays of RF ablation, significantly reducing procedure time while maintaining reliable lesion creation
Solution Approach 2:
The patent rushes through the ablation process by using nanosecond-duration pulses that create immediate electroporation effects. Unlike RF ablation that requires prolonged heating periods, the nanosecond pulses achieve tissue destruction in fractions of a second per pulse, allowing rapid completion of ablation lesions
3Productivity
If RF ablation is used to treat AF, then initial treatment is provided, but high recurrence rates occur due to limited control over ablated volume geometry
Solution Approach 1:
The patent applies nanosecond pulsed electric fields through specifically configured electrodes (such as irrigated-tip catheters) to create highly localized ablation zones. The electric field is concentrated precisely where needed, allowing control over the geometry and dimensions of the ablated volume, thereby preventing recurrence through more reliable lesion geometry
Solution Approach 2:
The patent incorporates irrigation feedback mechanisms where cooling fluid flow and temperature sensors provide real-time information about tissue conditions. This feedback allows dynamic adjustment of the nanosecond pulse parameters to maintain precise control over ablation volume geometry, ensuring consistent non-conducting lesions that prevent AF recurrence
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
nsPEF ablation provides more precise control over the ablation volume, reduces thermal side effects, and significantly shortens procedure times, addressing the limitations of existing methods while enhancing treatment efficacy for arrhythmia conditions like atrial fibrillation.
Implementation Method 1
Ablation with nsPEFs provides treatments and therapies for a plurality of arrhythmia conditions... The interaction of nsPEFs with untreated tissue to produce ablated tissue is by means of electroporating the outer cell membranes of the untreated tissue.
Data Source
AI summary
An apparatus and methods for performing ablation of myocardial tissues are disclosed. The apparatus includes a plurality of ablation electrode configurations to which nanosecond pulsed electric fields are applied. The methods relate to therapies to treat cardiac arrhythmias, such as, atrial fibrillation and scar-related ventricular tachycardia, amongst others. The affected myocardial tissues are ablated creating a plurality of lesions enabled by the nanosecond pulsed electric fields applied to either penetrating electrodes, endo-endo electrodes, or endo-epi electrodes. Different electrophysiological tests are performed to assess the application of nanosecond pulsed electric field ablation to specific desired tissue location within the heart. Test results show the potential to overcome limitations of current ablation therapies, thereby providing patients and doctors a superior treatment for cardiac arrhythmias.