Irrigated Ablation Catheter Sensor Array Fluid Interference
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Solution Overview
Problem
Irrigated ablation catheters face challenges in accurately sensing thermal and electrical properties due to interference from irrigation fluid, and existing designs are constrained by the need to accommodate sensors and irrigation systems within a limited distal end space, affecting the accuracy of tissue temperature measurement and lesion formation during RF ablation procedures.
Innovation Solution
The catheter features a sensor array with flexible substrates and sensors positioned within the electrode shell, where each sensor extends into orifices and is stabilized by an insert, forming a fluid-tight seal, allowing for accurate temperature and electrical measurements while minimizing irrigation interference, and a sensor controller digitizes signals for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are positioned at the distal end of the catheter to measure tissue temperature, then measurement precision is improved, but the irrigation fluid interferes with the sensor measurements causing inaccurate readings
Solution Approach 1:
A temperature compensation sensor is positioned within the electrode to sense the temperature of the irrigation fluid. This compensation sensor acts as an intermediary that measures the interfering factor (irrigation fluid temperature), which is then used to correct the readings from the tissue-facing sensors, eliminating the measurement error caused by irrigation fluid interference.
2Adaptability or versatility
If multiple sensors and irrigation components are accommodated at the distal end of the catheter, then sensing capability is improved, but device complexity increases due to spatial constraints
Solution Approach 1:
The temperature compensation sensor is nested within the electrode structure at the distal end of the catheter. This nesting arrangement allows multiple functional components (sensors and irrigation system) to be integrated in a compact configuration, accommodating enhanced sensing capability while managing the spatial constraints and reducing overall device complexity.
3Measurement precision
If sensors are positioned to extend into orifices for accurate measurement, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sensors are pre-positioned and secured within the electrode structure during manufacturing, with compensation sensors installed in predetermined locations within the electrode. This preliminary positioning ensures that during actual use, the sensors are already correctly aligned and positioned, achieving high measurement precision while reducing the need for complex real-time adjustment mechanisms.
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 configuration enhances the accuracy of tissue temperature and electrical measurements, reduces interference from irrigation fluid, and allows for precise control of electrode contact and ablation, improving the efficacy of RF ablation procedures by providing real-time data for lesion formation and movement detection.
Implementation Method 1
Heating of the tissue occurs due to its electrical resistance. The tissue is heated sufficiently to cause cellular destruction in the target tissue resulting in formation of a lesion
Implementation Method 2
RF current is applied to the tip electrode of the ablating catheter, and current flows through the media that surrounds it, i.e., blood and tissue, toward the reference electrode
Implementation Method 3
irrigation of the ablation catheter may provide many benefits including cooling of the electrode and tissue to prevent overheating of tissue
Implementation Method 4
a support which forms a fluid tight seal with a proximal end of the electrode and engages a proximal end of the insert to stabilize the insert against rotational motion
Data Source
AI summary
Systems and methods are disclosed for providing and using an irrigated ablation catheter. The catheter may include a distal shell electrode having irrigation apertures. A sensor array formed on a flexible substrate conforms to an inner surface of the electrode and an insert disposed within the interior space engages the sensor array to position sensors of the sensor array in desired locations relative to the electrode. A support seals the proximal end of the electrode and engages the insert. The plurality of sensors may be used to measure electrical and thermal characteristics surrounding the electrode and may help assess contact between the electrode and tissue and/or determine movement of the electrode during ablation.