Multipurpose Electrode with Variable Impedance for Mapping and Ablation
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Solution Overview
Problem
Existing electrode technologies face challenges in simultaneously performing reliable electrophysiological mapping and effective tissue ablation due to surface area averaging and visualization difficulties when using large electrodes for both mapping and ablation, leading to inaccuracies in targeting the correct tissue location.
Innovation Solution
A multipurpose electrode with a variable impedance region and a substantially constant impedance region allows for distinct functions at different frequencies, enabling precise electrophysiological mapping at low frequencies and efficient ablation at high frequencies, using a single electrode with a smaller mapping region and a larger ablation region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large surface area electrode is used for ablation, then fewer conductors are required and larger target area can be ablated in one pass, but the electrode becomes less optimal for mapping due to greater surface area averaging
Solution Approach 1:
The electrode is divided into multiple independent electrode segments along its length, allowing different segments to perform different functions. Mapping can be performed using specific segments while ablation can be performed using the entire electrode or different segments, resolving the contradiction between mapping precision and ablation efficiency
Solution Approach 2:
Different portions of the electrode are designed with different properties - certain segments are optimized for mapping (smaller effective area, specific impedance characteristics) while the overall electrode maintains large surface area for efficient ablation. This local differentiation allows each function to operate at its optimal performance level
2Measurement precision
If separate mapping and ablation electrodes are used at different locations, then mapping precision is improved, but device repositioning is required between mapping and ablation steps
Solution Approach 1:
The electrode structure integrates both mapping and ablation capabilities in a single component. The same electrode segments used for mapping can immediately perform ablation without requiring device repositioning, eliminating time loss while maintaining precision through the segmented design
3Manufacturing precision
If the device is moved after mapping to align the ablation electrode with the mapped tissue, then ablation targeting is improved, but visualization challenges make it difficult to achieve precise alignment
Solution Approach 1:
The electrode is segmented into multiple independent sections that can be individually controlled. This allows the system to deliver ablation energy precisely to the mapped target location by activating only the appropriate segment, achieving high targeting precision without requiring complex repositioning maneuvers that are difficult to visualize
4Measurement precision
If a small surface area electrode is used for mapping, then less surface averaging occurs and more reliable measurements are obtained, but the electrode is less efficient for ablation requiring more conductors and multiple passes
Solution Approach 1:
The electrode is divided into multiple segments that can function independently. During mapping, only the necessary small portion is activated for precise measurements. During ablation, the full electrode surface area or multiple segments are activated simultaneously, achieving high ablation efficiency without compromising mapping precision
Solution Approach 2:
The electrode structure is designed to perform multiple functions - it can operate as a small precise mapping electrode when needed, and as a large efficient ablation electrode when needed. This multi-functionality allows a single electrode design to optimize both mapping precision and ablation efficiency
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 configuration reduces surface averaging during mapping and increases the ablation area, allowing for accurate tissue targeting without device repositioning, enhancing the precision and efficiency of electrophysiological data collection and RF ablation procedures.
Implementation Method 1
the variable impedance region has a first impedance when a first frequency is applied thereto, and a second impedance when a second frequency is applied thereto
Implementation Method 2
efficient ablation at high frequencies
Implementation Method 3
delivering an electrical signal with a frequency of at least about 50 KHz to the electrode
Data Source
AI summary
Multi-purpose electrodes for use during ablation are provided. The electrodes comprise a variable impedance region and a relatively constant impedance region. The relatively constant impedance region can be used for mapping, and both regions can be used for ablating. The mapping region can obtain low frequency electrophysiological signals during mapping, while both regions can conduct higher frequency ablation electrical signals to a patient during ablation.