Upper-Arm Sphygmomanometer Electrode Layout for Low-Noise ECG
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Solution Overview
Problem
Existing sphygmomanometers face challenges in accurately measuring both blood pressure and electrocardiogram waveforms due to environmental noise interference and unstable hand contact leading to noise in electrocardiogram measurements, and inaccurate blood pressure estimation.
Innovation Solution
An upper-arm sphygmomanometer design with a housing featuring specific electrode placements on the upper and side surfaces, allowing simultaneous contact by one hand, and a reference electrode to reduce noise, along with a detachable arm cuff unit for blood pressure measurement, ensuring stable hand positioning and reduced body motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise removal electrodes are provided to reduce environmental noise, then electrocardiogram waveform measurement quality is improved, but the subject must take an unstable posture which causes contact noise and reduces measurement reliability
Solution Approach 1:
The patent extracts the reference electrode function from the measurement electrodes and places it on the housing surface. This allows the reference electrode to be positioned separately to reduce environmental noise while the measurement electrodes remain on the subject's body, eliminating the need for unstable postures.
Solution Approach 2:
The patent introduces the housing as an intermediary structure that carries the reference electrode. This mediator allows the reference electrode to be positioned optimally for noise reduction without requiring the subject to change their posture, thus maintaining measurement stability.
2Measurement precision
If multiple electrodes are provided for electrocardiogram measurement, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The housing serves multiple functions: it protects internal components, provides a mounting surface for the reference electrode, and acts as part of the electrocardiogram measurement system. This multi-functionality reduces the need for additional separate components, simplifying the overall device structure.
Solution Approach 2:
The patent combines the reference electrode with the housing structure rather than treating it as a separate component. This merging reduces the number of discrete parts and simplifies the electrode configuration while maintaining the necessary measurement accuracy.
3Ease of operation
If the subject touches electrodes with hands during measurement, then electrocardiogram waveform can be measured, but body motion and contact instability introduce noise
Solution Approach 1:
The patent converts the harmful effect of body motion into a benefit by using the housing as a stable reference point. The reference electrode on the housing remains stationary while the measurement electrodes on the subject's body move naturally, allowing the subject to maintain a relaxed posture without introducing excessive noise.
Data Source
AI summary
In a main body of an upper-arm type sphygmomanometer that measures blood pressure of a subject by using a bag-shaped arm cuff to be wound around an arm of the subject, a main body housing includes an upper surface, and a first side surface and a second side surface on left and right sides. The first side surface includes a first side surface electrode region, the second side surface includes a second side surface electrode region, the upper surface includes a first upper surface electrode region, a first electrocardiogram waveform measurement electrode is provided in the first side surface electrode region, a second electrocardiogram waveform measurement electrode is provided in the second side surface electrode region, and a first reference electrode is provided in the first upper surface electrode region.