Ablation Catheter Electrode Segmentation for Passive Cooling
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Solution Overview
Problem
Current ablation systems face challenges in effectively cooling medical device electrodes in low fluid flow environments, leading to inaccurate temperature measurements and potential tissue injury due to excessive heat buildup, as existing cooling methods compromise the ability to monitor the device-tissue interface temperature accurately.
Innovation Solution
A medical device with an elongate body featuring a fluid flow path, electrodes, and a heat transfer element that isolates the electrodes and temperature sensors from the fluid flow, allowing for effective cooling without compromising temperature measurement accuracy, using a cryogenic coolant and radiofrequency energy modulation based on temperature sensor feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If active cooling with irrigation fluid is used to cool electrodes in low fluid flow areas, then heat dissipation is improved, but temperature measurement accuracy deteriorates because the cooling fluid compromises the sensor's ability to accurately measure the electrode-tissue interface temperature
Solution Approach 1:
The device divides the electrode structure into multiple segments: a first electrode portion exposed to tissue for ablation, a second electrode portion isolated from tissue, and a temperature sensor positioned on the isolated portion. This segmentation allows the sensor to measure electrode temperature without being exposed to cooling fluid, while the exposed portion undergoes active cooling for heat dissipation.
Solution Approach 2:
The patent introduces an intermediary structure (the isolated electrode portion and housing configuration) that separates the temperature sensor from the cooling fluid flow path. The sensor measures temperature through thermal conduction from the tissue-contacting electrode portion via the electrode body, without direct exposure to the cooling fluid, thus maintaining measurement accuracy while enabling active cooling.
2Object-affected harmful factors
If electrodes are cooled directly with cooling fluid to prevent excessive heat buildup, then tissue injury from excessive heat is prevented, but the ability to accurately monitor device-tissue interface temperature is compromised
Solution Approach 1:
The electrode is segmented into a first electrode portion that contacts tissue for ablation and a second electrode portion that is isolated from tissue and exposed to cooling fluid. The temperature sensor is positioned on the isolated second portion, allowing it to measure electrode temperature without being exposed to cooling fluid, thus maintaining accurate temperature monitoring while enabling effective cooling to prevent tissue injury.
Solution Approach 2:
The patent uses the electrode body as an intermediary thermal pathway. The temperature sensor measures temperature through thermal conduction from the tissue-contacting first electrode portion via the electrode body to the sensor on the isolated second portion. This intermediary pathway allows accurate temperature monitoring while the isolated portion is cooled by the fluid flow path.
3Manufacturing precision
If temperature-based feedback control is used to modulate ablation energy, then treatment precision is improved, but in low fluid flow areas temperature rises too quickly requiring quicker reduction in powering and reduced treatment efficacy
Solution Approach 1:
The device incorporates a cooling fluid flow path and active cooling mechanism that is prepared and activated before ablation energy delivery begins. This preliminary cooling preparation prevents excessive temperature rise during ablation, allowing sustained energy delivery and improved treatment efficacy while maintaining temperature-based feedback control precision.
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 solution enables precise temperature monitoring and control during ablation procedures, preventing tissue injury by maintaining accurate temperature measurements and ensuring effective heat dissipation even in areas with low fluid flow, thereby enhancing treatment efficacy and safety.
Implementation Method 1
a heat transfer element defining a first portion in thermal communication with the electrode and a second portion in thermal communication with the fluid flow path
Implementation Method 2
a coolant source, such as a cryogenic fluid, may be coupled to the fluid flow path
Data Source
AI summary
A medical system, including a catheter having a fluid flow path and a distal portion separated from the fluid flow path; a plurality of electrodes coupled to the distal portion; at least one temperature sensor coupled to the distal portion; a heat sink in thermal communication with each electrode and in fluid communication with the fluid flow path; a radiofrequency signal generator in communication with the plurality of electrodes; and a fluid source in fluid communication with the fluid flow path.