Cardiac PEF Catheter Ablation for Non-Thermal Conduction Block
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Solution Overview
Problem
Current methods for treating atrial fibrillation, such as radiofrequency ablation and irreversible electroporation, face limitations including long procedure times, incomplete energy delivery, thermal damage to extracardiac structures, and recurrence of arrhythmia, necessitating safer and more effective treatment options.
Innovation Solution
A system utilizing a specialized catheter and high-voltage waveform generator delivers pulsed electric fields (PEFs) to cardiac tissue, synchronized with the patient's cardiac rhythm, to create non-thermal lesions for conduction block, avoiding thermal injury and ensuring transmural energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiofrequency ablation is used to treat atrial fibrillation, then conduction block is achieved, but thermal damage to extracardiac structures occurs
Solution Approach 1:
The patent changes the fundamental parameter of energy delivery from thermal (continuous RF) to non-thermal (pulsed electric fields). This allows achieving the same conduction block effect without the harmful thermal side effects, as PEFs create lesions through electroporation rather than heat, eliminating risks of esophageal injury, pulmonary vein stenosis, and other thermal damages
2Object-affected harmful factors
If irreversible electroporation is used to treat atrial fibrillation, then thermal damage is avoided, but incomplete energy delivery occurs
Solution Approach 1:
The patent employs periodic pulsed electric fields with specific duty cycles (e.g., 10-90% for PEF, 1-10% for IRE) delivered in sequences. This periodic action ensures complete transmural energy delivery by allowing adequate time for field penetration and electroporation effect accumulation, while the pulse intervals prevent thermal buildup, achieving both complete lesions and thermal safety
Solution Approach 2:
The system incorporates real-time monitoring of tissue impedance and temperature to adjust energy delivery parameters dynamically. This feedback mechanism ensures complete energy delivery to the full thickness of the atrial wall while preventing overheating, addressing the incomplete lesion formation issue of IRE without sacrificing safety
3Ease of manufacture
If conventional RF catheters are used for pulmonary vein isolation, then treatment can be performed, but long procedure times are required
Solution Approach 1:
The patent employs continuous circumferential contact catheters that deliver energy along the entire length of the catheter shaft simultaneously, rather than point-by-point ablation. This continuous action creates complete circular lesions around pulmonary veins in a single deployment, dramatically reducing procedure time while maintaining effective isolation
Solution Approach 2:
The system performs preliminary positioning and mapping to identify optimal catheter placement and energy delivery parameters before actual ablation. This preliminary preparation ensures that when energy delivery begins, it is immediately effective and complete, avoiding repeated adjustments and extending procedure time
4Reliability
If high energy is delivered to create conduction block, then arrhythmia treatment is effective, but complications increase
Solution Approach 1:
The patent changes the energy delivery mechanism from thermal to non-thermal pulsed electric fields, which create lesions through controlled electroporation of cell membranes. This parameter change achieves effective conduction block for arrhythmia treatment while eliminating thermal complications such as esophageal injury, pulmonary vein stenosis, and atrio-esophageal fistula
Solution Approach 2:
The use of periodic pulsed electric fields with controlled duty cycles allows accumulation of electroporation effect over multiple pulses, achieving complete transmural lesions with lower peak energies than continuous RF. This periodic delivery reduces the risk of acute complications while ensuring effective arrhythmia treatment
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 PEF system provides safer and more effective treatment of atrial fibrillation by reducing complications and ensuring complete conduction block without thermal damage to surrounding tissues, enhancing procedural efficiency and patient safety.
Implementation Method 1
irreversible electroporation (IRE), a non-thermal therapy based on the unrecoverable permeabilization of cell membranes caused by particular short pulses of high voltage energy
Implementation Method 2
A system utilizing a specialized catheter and high-voltage waveform generator delivers pulsed electric fields (PEFs) to cardiac tissue, synchronized with the patient's cardiac rhythm
Data Source
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AI summary
Devices, systems and methods are provided for treating conditions of the heart, particularly the occurrence of arrhythmias. The devices, systems and methods deliver therapeutic energy to portions the heart to provide tissue modification, such as to the entrances to the pulmonary veins in the treatment of atrial fibrillation. Generally, the tissue modification systems include a specialized catheter, a high voltage waveform generator and at least one distinct energy delivery algorithm. Other embodiments include conventional ablation catheters and system components to enable use with a high voltage waveform generator. Example catheter designs include a variety of delivery types including focal delivery, "one-shot" delivery and various possible combinations. In some embodiments, energy is delivered in a monopolar fashion. However, it may be appreciated that a variety of other embodiments are also provided.