PFA Waveform Mapping Using Gradient Sensing for Precise Ablation
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Solution Overview
Problem
Existing tissue ablation techniques, such as thermal ablation, often cause collateral damage to non-targeted tissue and lack precision in delivering pulsed electric fields (PEF) for effective treatment of conditions like cardiac arrhythmias.
Innovation Solution
A PFA system uses non-therapeutic PEF waveforms to predict ablative PEF waveforms by determining electrical responses, allowing for precise targeting of electrodes to concentrate electric field energy on the target tissue while minimizing it in non-targeted areas, using gradient sensing and impedance analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal ablation techniques are used to treat target tissue, then ablation energy can be delivered to the tissue, but collateral damage to non-targeted tissue occurs and precision is reduced
Solution Approach 1:
The patent applies local quality by creating highly localized electric field gradients through specific electrode configurations and waveform parameters. The system delivers PEF energy with spatially varying field strengths that concentrate effect precisely at the target tissue interface while rapidly declining in non-targeted areas, achieving localized ablation without broad collateral damage.
Solution Approach 2:
The patent utilizes parameter changes by employing controlled PEF waveforms with specific amplitudes, durations, and repetition frequencies. By adjusting these electrical parameters and the timing between pulses, the system optimizes tissue permeabilization at the target site while preventing excessive energy deposition in surrounding healthy tissue, thereby improving precision and reducing harm.
2Reliability
If PEF waveforms are applied to achieve reversible or irreversible electroporation, then non-thermal ablation can be performed, but precise control of electric field distribution is required
Solution Approach 1:
The patent implements feedback through a systematic approach where non-therapeutic waveforms are first applied to map the electrical response and impedance characteristics of the tissue. This information is then used to adjust and optimize the parameters of subsequent ablative waveforms, creating a closed-loop control system that reliably achieves electroporation while simplifying field distribution control through data-driven parameter selection.
Solution Approach 2:
The patent applies preliminary action by conducting a non-therapeutic mapping phase before delivering ablative PEF waveforms. During this preliminary step, the system characterizes the tissue's electrical properties and predicts the electric field distribution, allowing optimal parameters to be predetermined and thereby simplifying the subsequent ablation process while ensuring reliable electroporation outcomes.
3Adaptability or versatility
If manual programming of PEF parameters is performed, then waveform customization is possible, but time consumption and operational complexity increase
Solution Approach 1:
The patent applies self-service by enabling the system to automatically determine optimal PEF waveform parameters based on real-time electrical response measurements from the tissue. The system self-adjusts amplitude, duration, and frequency parameters without requiring manual programming, thereby maintaining waveform customization and adaptability while dramatically reducing the time and operational complexity associated with parameter setup.
Solution Approach 2:
The patent uses preliminary action by pre-calculating optimal waveform parameters through non-therapeutic mapping and electrical response analysis before ablation begins. This preliminary characterization allows the system to have treatment parameters ready in advance, eliminating time-consuming manual programming during the actual ablation procedure while preserving full parameter customization based on measured tissue properties.
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
Enables precise and safe ablation of target tissue with reduced collateral damage by optimizing the delivery of PEF waveforms, enhancing treatment efficacy and patient safety.
Implementation Method 1
PFA includes application of short pulsed electric fields (PEF), which may reversibly or irreversibly destabilize cell membranes through electro-permeabilization
Implementation Method 2
The processing circuitry is further configured to determine an electrical response to the delivered non-therapeutic PEF waveform based at least in part on signals received on at least one test electrode
Implementation Method 3
the electrical response includes an electric field gradient that is scaled in the response analyzer or ablative waveform generator by a factor to predict an electric field gradient produced by the ablative PEF waveform
Data Source
AI summary
A method and a pulsed electric field (PEF) ablation instrument are provided. According to one aspect, a method in a PFA generator includes receiving electrical responses for each of at least one non-therapeutic waveform. The process also includes determining an electric field distribution based at least in part on the received electrical responses. The process further includes selecting a non-therapeutic waveform that produces an electric field distribution that satisfies criteria. The process also includes mapping the selected non-therapeutic waveform to an ablative waveform.