Pulsed RF Ablation Power Control for Deep Lesions Without Steam Pops
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Solution Overview
Problem
Existing RF ablation systems face challenges in achieving deep lesion depths without causing steam pops, which can be undesirable due to the need for prolonged application of high power or increased power levels, posing risks to tissue integrity.
Innovation Solution
The system employs short, high-power RF pulses with controlled intermissions and real-time temperature monitoring, adjusting power levels based on tissue temperature feedback to ensure safe and efficient lesion formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If prolonged application of high power or increased power levels is used to achieve deep lesion depths, then deep lesion formation is improved, but tissue integrity deteriorates due to steam pops
Solution Approach 1:
The patent applies periodic pulsed RF energy delivery instead of continuous power application. The system delivers high-power RF pulses (greater than 80 W) with short durations (less than 10 seconds) separated by intermissions (less than 10 seconds), allowing tissue to cool between pulses and preventing steam pop formation while achieving deep lesion depths through repeated thermal cycles
Solution Approach 2:
The system dynamically adjusts RF power levels based on real-time temperature feedback from tissue sensors. The processor monitors tissue temperature during pulse application and modulates the power of subsequent pulses accordingly, enabling adaptive control that optimizes lesion depth while preventing harmful overheating and steam pops
2Productivity
If high-power RF pulses are applied to achieve rapid lesion formation, then treatment time is reduced, but control precision deteriorates due to difficulty in preventing tissue damage
Solution Approach 1:
The system incorporates real-time temperature monitoring during RF pulse application and uses this feedback to dynamically adjust subsequent pulse parameters. The processor receives temperature signals from the tissue and modifies the power, duration, or intermission timing of following pulses to maintain optimal treatment conditions, enabling rapid lesion formation with precise control over tissue damage
Solution Approach 2:
The system changes multiple parameters simultaneously - using high power levels (greater than 80 W) combined with short pulse durations (less than 10 seconds) and controlled intermissions (less than 10 seconds). This parameter optimization allows rapid energy delivery for fast lesion formation while the short duration and cooling periods prevent excessive tissue damage
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 allows for rapid and safe creation of deep lesions by minimizing tissue damage and reducing the risk of steam pops, enhancing the efficacy and safety of the ablation procedure.
Implementation Method 1
tissue surrounding the electrode in the target region is destroyed by heating via RF electric current
Implementation Method 2
receive at least one signal that indicates a measured temperature of the tissue
Data Source
AI summary
Described embodiments include a system and method for pulsed RF ablation that includes generating a plurality of pulses of radiofrequency (RF) current for application to tissue of a subject for cardiac ablation, driving the RF each one of the pulses such that the power of the pulse initially rises from zero to a maximum value, each one of the pulses having a duration from a start point in time to an end point in time, and an intermission between the end point and the start point of successive pulses, receiving at least one signal from a temperature sensor configured to measure a temperature of the tissue being ablated and controlling the power of the plurality of pulses to fractionally change the power of each of the pulses between the start point and end point in response to the measured temperature of the tissue being ablated.