Irrigated Ablation Catheter Temperature Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catheter ablation systems for treating cardiac arrhythmias face challenges in maintaining stable temperature control during radiofrequency ablation due to discrete irrigation flow rate controls, leading to unstable temperatures and reduced effectiveness of the ablation process.
Innovation Solution
A catheter ablation system with a processor-controlled irrigation module that adjusts the irrigation flow rate continuously based on real-time temperature feedback, target power, and target average temperature, using a proportional-integral-derivative control loop to maintain stable temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If discrete irrigation flow rate controls are used, then the system structure is simpler, but the temperature control stability deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from static discrete flow rate control to dynamic continuous flow rate control. The irrigation flow rate is continuously adjusted in real-time based on temperature feedback, allowing the system to adapt to changing thermal conditions and maintain stable temperature control during ablation procedures.
Solution Approach 2:
The patent implements feedback control by using temperature sensors to monitor the tissue temperature during ablation and feeding this information back to the irrigation control system. The system then adjusts the irrigation flow rate accordingly to maintain the desired temperature, creating a closed-loop control mechanism that ensures temperature stability.
2Manufacturing precision
If continuous irrigation flow rate adjustment is implemented, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical discrete control mechanisms with electronic continuous control systems. Instead of using mechanical components to adjust flow rates in discrete steps, the system uses electronic controllers and sensors to continuously modulate the irrigation flow rate, achieving higher precision temperature control through electronic regulation.
Solution Approach 2:
The patent applies parameter changes by continuously varying the irrigation flow rate parameter in real-time based on temperature measurements. The system dynamically adjusts this critical parameter to optimize temperature control precision, allowing fine-tuned control over the cooling effect during ablation procedures.
3Temperature
If higher irrigation flow rates are used, then cooling effectiveness is improved, but energy loss increases
Solution Approach 1:
The patent applies continuity of useful action by maintaining optimal irrigation flow rates continuously throughout the ablation procedure. Rather than using high flow rates intermittently or at fixed discrete levels, the system continuously adjusts the flow rate to match the actual cooling needs, ensuring effective temperature control while minimizing unnecessary energy consumption from excessive irrigation.
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 system achieves stable and predictable temperature control across varying power settings and tissue conditions, improving the consistency and effectiveness of the ablation process.
Implementation Method 1
a temperature sensor... The processor of the operating console receives a current temperature from the temperature sensor
Implementation Method 2
Radio frequency (RF) current is applied to the ablation electrode of the catheter, and flows through the surrounding media, i.e., blood and tissue, toward the reference electrode. The distribution of current depends on the amount of electrode surface in contact with the tissue... Heating of the tissue occurs due to its electrical resistivity.
Implementation Method 3
circulating blood provides some cooling of the ablation electrode. Another method is to irrigate the ablation electrode, e.g., with physiologic saline at room temperature, to actively cool the ablation electrode
Data Source
AI summary
A catheter ablation system includes: a catheter probe having distal end including: a temperature sensor; a plurality of irrigation holes; and an ablating electrode; a radiofrequency (RF) heating controller coupled to the catheter probe and configured to supply RF energy to the ablating electrode to control the ablating electrode to emit heat at a target power; an irrigation controller coupled to the catheter probe and configured to supply an irrigation fluid at a continuously adjustable irrigation flow rate through the catheter probe to exit through the irrigation holes; and an operating console having a processor and memory, the memory storing instructions that, when executed by the processor, cause the processor to control the irrigation controller to set the irrigation flow rate based on the target power and a target average temperature.