Pulsed RF Ablation Resistive Heating Lesion Depth
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Solution Overview
Problem
Existing radiofrequency (RF) ablation systems face limitations in using high continuous power levels due to the risk of steam pops, which restricts the efficiency and effectiveness of tissue ablation.
Innovation Solution
The method involves applying two pulses of high RF power of short duration (75 W-95 W for 4-5 seconds each) separated by a suspension interval (4-10 seconds), allowing resistive heating and thermal latency to enhance lesion formation without inducing steam pops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high continuous power levels (75-95 W) are applied during RF ablation, then the ablation time is reduced and productivity increases, but steam pops are formed causing harmful effects
Solution Approach 1:
The patent applies periodic action by delivering RF energy in pulsed mode rather than continuously. The system delivers power in discrete pulses separated by interruption periods, allowing thermal energy to dissipate between pulses. This prevents steam pops while maintaining high average power delivery for efficient ablation. The pulsed delivery pattern enables the tissue to heat sufficiently for effective ablation without reaching the temperature thresholds that cause steam pops.
Solution Approach 2:
The patent employs preliminary action by pre-heating the tissue to a specific temperature range (40-60°C) before delivering the high power RF pulses. This preliminary heating phase prepares the tissue to accept higher power delivery without immediate steam pop formation. The system monitors temperature and adjusts power delivery accordingly, ensuring the tissue is in an optimal state for ablation while preventing harmful steam pop events.
2Productivity
If high power levels are used to reduce ablation time, then productivity improves, but the risk of unintended tissue damage increases
Solution Approach 1:
The patent implements feedback control by continuously monitoring tissue temperature during the ablation process. The system uses temperature sensors to detect the thermal state of the tissue and adjusts RF power delivery in real-time based on this feedback. When temperature approaches thresholds that could cause steam pops or unintended damage, the system automatically reduces or interrupts power delivery. This closed-loop control enables high power delivery for efficient ablation while preventing unintended tissue damage through real-time temperature-based feedback adjustment.
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 approach enables the creation of lesions with increased surface area and depth while minimizing the risk of complications such as steam pops, allowing for more efficient and effective tissue ablation.
Implementation Method 1
applying radiofrequency (RF) power via the electrode within a range of about 75 W-95 W that induces resistive heating
Implementation Method 2
suspending application of RF power to the electrode for a second duration to allow tissue surrounding the lesion to heat by conduction from the lesion
Data Source
AI summary
A method, including performing an ablation of tissue using a first high RF power for a short duration, suspending RF power for a predetermined period, and using a second high RF power for a short duration forming lesions with greater surface area and greater depth through resistive heating and thermal latency. High RF power may range between 75-95 W and short duration may range between 4-5 seconds.