Ablation Catheter Pulse Amplitude Control for Discharge Suppression
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Solution Overview
Problem
Existing ablation systems using irreversible electroporation face issues with electrostatic discharge and thrombus formation due to high electric-field concentration, leading to displacement of the ablation catheter position during treatment.
Innovation Solution
A power supply device controls pulse voltages with multiple positive amplitude values applied to multiple electrodes, ensuring an amplitude difference threshold is maintained to suppress electric-field concentration and reduce electrostatic discharge, thereby preventing thrombus formation and catheter displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage pulse is applied to the electrode for ablation using irreversible electroporation, then ablation effectiveness is improved, but electrostatic discharge from the end portion of the electrode is easily generated due to electric-field concentration
Solution Approach 1:
The patent applies parameter changes by using multiple types of positive amplitude values for pulse voltages instead of a single high voltage. The control unit switches between different positive amplitude values (e.g., first, second, and third positive amplitude values) to apply power to multiple electrodes, thereby reducing electric-field concentration while maintaining ablation effectiveness through cumulative energy delivery.
2Power
If high voltage pulse is applied to the electrode, then ablation power is increased, but thrombus may occur and the indwelling position of the ablation catheter may be displaced by the impact of the electrostatic discharge
Solution Approach 1:
The patent segments the ablation process by dividing it into multiple stages with different positive amplitude values. Instead of applying one high voltage pulse, the system applies multiple lower amplitude pulses sequentially to different electrodes, distributing the total energy delivery over time and space. This segmentation reduces peak electric-field concentration and prevents electrostatic discharge while maintaining cumulative ablation power.
3Object-affected harmful factors
If pulse voltages with multiple types of positive amplitude values are applied to three or more application electrodes, then electric-field concentration is suppressed and electrostatic discharge is reduced, but device complexity increases
Solution Approach 1:
The control unit is designed with multi-functionality to handle multiple positive amplitude values and switch between them based on predetermined conditions. This single control unit performs multiple functions: selecting appropriate amplitude values, timing the application to different electrodes, and managing the overall power delivery sequence. This universal approach manages device complexity by consolidating control logic rather than requiring separate systems for each function.
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 controlled application of pulse voltages improves the effectiveness of ablation treatment by minimizing thrombus occurrence and maintaining the catheter's indwelling position, enhancing the overall treatment efficacy.
Implementation Method 1
a power source unit configured to supply power for performing ablation using irreversible electroporation to a plurality of electrodes in an ablation catheter
Implementation Method 2
the electrostatic discharge from the end portion of the electrode is easily generated due to the electric-field concentration resulting from the high voltage
Implementation Method 3
When such an electrostatic discharge occurs at the end portion of the electrode, thrombus may occur
Data Source
AI summary
A power supply device according to an embodiment of the disclosure includes a power source unit configured to supply power for performing ablation using irreversible electroporation to a plurality of electrodes in an ablation catheter, and a control unit configured to control pulse voltages such that when the ablation is performed by supplying the power, the pulse voltages with a plurality of types of positive amplitude values are applied to three or more application electrodes including the plurality of electrodes.