Body-Surface Electrode Positioning via ECG Signal Polarity
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Solution Overview
Problem
Existing methods for positioning electrodes on the skin during medical procedures, such as those related to heart ablation, face challenges in accurately determining the optimal geometric relationship between electrodes and the heart, leading to potential misplacement and artifacts in electrocardiograph (ECG) signal interpretation.
Innovation Solution
A system that processes ECG signals from electrodes attached to the skin to derive signal parameters, specifically polarity, which helps in adjusting the electrode positions to achieve a specified geometrical relationship with the heart, ensuring optimal tracking and measurement of impedances between a probe and the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If body-surface electrodes are positioned on the skin during medical procedures, then ECG signals can be obtained for monitoring and tracking, but the geometric relationship between electrodes and the heart is difficult to determine accurately, leading to potential misplacement and artifacts in signal interpretation
Solution Approach 1:
The patent introduces an intermediary computational process that uses ECG signal characteristics (amplitude, morphology, timing) as mediators to infer the geometric relationship between electrodes and the heart. By analyzing these signal properties, the system indirectly determines electrode positioning without requiring direct geometric measurement, thus resolving the contradiction between obtaining accurate signals and determining geometric relationships.
Solution Approach 2:
The patent changes the approach from directly measuring geometric parameters to analyzing electrical signal parameters (amplitude, voltage, timing characteristics). By transforming the problem from spatial measurement to electrical parameter analysis, the system can accurately assess electrode positioning through ECG signal properties without losing geometric relationship information.
2Manufacturing precision
If electrodes are placed to achieve optimal geometric relationship with the heart, then tracking accuracy and impedance measurement precision improve, but the process of determining correct positioning becomes more complex
Solution Approach 1:
The patent implements a feedback mechanism where ECG signal characteristics are continuously monitored and used to assess electrode positioning quality. The system provides feedback indicators (signal amplitude, morphology analysis, timing characteristics) that guide electrode repositioning, enabling accurate positioning through iterative adjustment rather than complex pre-planning or sophisticated positioning devices.
Solution Approach 2:
The system uses the ECG signals themselves as the basis for evaluating electrode positioning, making the signals serve dual purposes: both monitoring cardiac activity and guiding electrode placement. This self-service approach eliminates the need for separate complex positioning determination systems, as the ECG signals provide inherent feedback about electrode geometric relationships.
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 precise adjustment of electrode positions to surround the heart, enhancing the accuracy of ECG signal interpretation and impedance measurements, thereby optimizing the tracking of a probe within or near the heart during medical procedures.
Implementation Method 1
a plurality of body-surface electrodes coupled to skin of a subject in general proximity to a heart, wherein the body-surface electrodes are configured to receive currents, from a catheter electrode within the subject, indicative of a location of the catheter electrode
Implementation Method 2
ensuring optimal tracking and measurement of impedances between a probe and the electrodes
Data Source
AI summary
A method, consisting of receiving respective electrocardiograph (ECG) signals from body-surface electrodes at respective locations in proximity to a heart of a subject. The ECG signals may be processed to generate respective signal parameters characteristic of positions of the body-surface electrodes with respect to the heart, and the respective locations may be adjusted so as to achieve a specified geometrical relationship between the body-surface electrodes and the heart in response to the respective signal parameters.