Multi-Electrode RF Ablation Power Selection for Lesion Control
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Solution Overview
Problem
Existing cardiac ablation technologies face challenges in controlling the shape, depth, and uniformity of lesions, as well as ensuring safe and effective delivery of RF energy to cardiac tissue to treat improper electrical activity.
Innovation Solution
A graphical user interface (GUI) is used to display and control the selection and energy assignment of electrodes on an ablation catheter, estimating energy distribution based on electrode distances and thresholds to ensure safe and uniform lesion formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF energy is delivered to cardiac tissue to treat arrhythmias, then improper electrical activity is eliminated, but risk of causing new arrhythmias or tissue damage increases
Solution Approach 1:
The system performs preliminary estimation of power distribution at sink electrodes before actual RF energy delivery. By calculating expected power levels at sink electrodes based on source electrode power assignments and tissue conductivity models, the system can predict potential harmful effects and adjust parameters in advance to prevent arrhythmias and tissue damage while maintaining treatment efficacy.
Solution Approach 2:
The system continuously monitors actual power distribution at sink electrodes during RF delivery and compares it against predicted values. This feedback mechanism allows real-time adjustment of source electrode power assignments to maintain power levels within safe thresholds, preventing harmful effects while ensuring effective treatment of the arrhythmia.
2Manufacturing precision
If power is assigned to source electrodes to create ablation lesions, then lesion formation is achieved, but control over lesion shape, depth, and uniformity becomes difficult
Solution Approach 1:
The ablation catheter is divided into multiple independently controllable source electrodes and sink electrodes. Each source electrode can be assigned independent power levels, allowing precise control over the spatial distribution of RF energy. This segmentation enables the system to create lesions with controlled shape, depth, and uniformity by adjusting power to individual source electrodes rather than applying uniform power throughout.
Solution Approach 2:
The system dynamically adjusts power assignment parameters to source electrodes based on desired lesion characteristics and predicted power distribution at sink electrodes. By changing power levels as a controllable parameter, the system can optimize lesion formation while maintaining safety margins, reducing the complexity of direct control through simplified parameter-based adjustment.
3Adaptability or versatility
If multiple electrodes are used for RF delivery, then treatment coverage is improved, but estimation of power distribution at sink electrodes becomes complex
Solution Approach 1:
The system introduces an intermediary computational model that estimates power distribution at sink electrodes based on source electrode power assignments and known tissue conductivity characteristics. This intermediary model simplifies the complex electromagnetic field calculations by using approximations and pre-characterized tissue properties, enabling accurate power distribution estimation across multiple electrodes without requiring complex real-time measurements.
Solution Approach 2:
The system creates a virtual copy or representation of the electrode array and tissue interactions through computational modeling. By simulating power distribution patterns in a virtual model before actual treatment, the system can predict sink electrode power levels and adjust source electrode assignments to achieve desired treatment coverage while maintaining safe power levels throughout the tissue.
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 GUI enables precise control of ablation parameters, ensuring uniform lesion formation and safe energy delivery, reducing the risk of arrhythmias and improving treatment efficacy.
Implementation Method 1
designating the active electrodes as a source electrode or a sink electrode; assigning an electrical unit to each of the designated source electrodes; and estimating an amount of electrical units associated with each of the designated sink electrodes
Implementation Method 2
ensuring safe and effective delivery of RF energy to cardiac tissue to treat improper electrical activity
Data Source
AI summary
A computing device for generating and using a graphical user interface (GUI) is disclosed. The computing device includes one or more controllers configured to generate a graphical representation of a plurality of electrodes of an ablation catheter for displaying via the GUI; designate, via the GUI, at least some of the plurality of electrodes to be active electrodes; automatically designate the active electrodes as a source electrode or a sink electrode; assign an amount of energy to each of the designated source electrodes; and estimate an amount of energy associated with each of the designated sink electrodes based at least in part on the assigned energy of the designated source electrodes.