Catheter Microelectrodes for Tissue Contact Detection
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Solution Overview
Problem
Current cardiac ablation techniques face challenges in accurately determining tissue contact and orientation of ablation electrodes during procedures, leading to inefficiencies in treating cardiac arrhythmias.
Innovation Solution
The use of a catheter with circumferentially distributed microelectrodes forming bipolar pairs, which generate output signals to determine electrode proximity and orientation relative to myocardial tissue, allowing for real-time visual feedback to clinicians.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ablation electrodes are used without microelectrodes, then the device structure is simpler, but the ability to accurately determine tissue contact and orientation is insufficient
Solution Approach 1:
The catheter tip is segmented into multiple microelectrodes (first, second, third, and fourth microelectrodes) arranged in a specific pattern. This segmentation allows each microelectrode to independently sense electrical signals from the tissue, enabling precise determination of both tissue contact and catheter orientation through comparative analysis of the signals from different segments.
Solution Approach 2:
The microelectrodes serve multiple functions: they detect tissue contact through electrical signal amplitude comparison and simultaneously determine catheter orientation relative to the tissue surface. This multi-functionality resolves the contradiction by achieving both measurement objectives without requiring separate sensing mechanisms, thereby limiting the increase in device complexity.
2Loss of information
If multiple microelectrodes are added to the catheter, then tissue contact and orientation can be accurately determined, but the device complexity increases
Solution Approach 1:
The microelectrodes are pre-positioned in a specific geometric arrangement at the catheter tip before the procedure. This preliminary configuration enables the system to automatically determine tissue contact and orientation by comparing signals from the pre-arranged electrodes, eliminating the need for complex real-time adjustments or additional sensing mechanisms during the procedure.
Solution Approach 2:
The system provides real-time feedback to the operator by analyzing the relative amplitudes of electrical signals from the microelectrodes. When tissue contact is detected, the amplitude comparison provides immediate feedback about contact quality and orientation, allowing the operator to adjust the catheter position based on this feedback without requiring complex manual assessment.
3Manufacturing precision
If visual feedback is provided to the clinician, then the precision of ablation is improved, but the system complexity increases
Solution Approach 1:
The system replaces mechanical visual inspection methods with electrical signal-based detection. Instead of requiring the operator to visually assess tissue contact through direct observation, the system uses electrical signals from the microelectrodes to automatically determine contact and orientation, then provides this information through visual feedback on a display device. This substitution achieves high precision while keeping the added complexity manageable.
Solution Approach 2:
The microelectrodes act as intermediaries between the catheter and the tissue, converting physical contact and orientation information into electrical signals. These signals are then processed by the system to generate visual feedback for the clinician. The intermediary role of the microelectrodes simplifies the overall system architecture by providing a direct transduction mechanism from physical state to measurable signal.
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 enhances the precision of cardiac ablation by ensuring accurate tissue contact and orientation, improving the effectiveness of ablation procedures and lesion formation.
Implementation Method 1
The plurality of microelectrodes define a plurality of bipolar microelectrode pairs, each bipolar microelectrode pair configured to generate an output signal
Implementation Method 2
In radio frequency (RF) ablation, RF energy is directed from the ablation electrode through tissue to an electrode to ablate the tissue and form a lesion
Data Source
AI summary
An electrophysiology system comprises an ablation catheter, a radiofrequency generator, and a mapping processor. The ablation catheter has a tissue ablation electrode and a plurality of microelectrodes distributed about the circumference of the tissue ablation electrode and electrically isolated therefrom. The plurality of microelectrodes define a plurality of bipolar microelectrode pairs. The mapping processor is configured to acquire output signals from the bipolar microelectrode pairs, compare the output signals, and generate an output to a display providing a visual indication of a characteristic of the microelectrodes and the tissue ablation electrode relative to myocardial tissue to be mapped and/or ablated.