Wrist-Worn Biometric Device for Stable Blood Pressure and ECG Measurement
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Solution Overview
Problem
Existing portable devices for measuring blood pressure and electrocardiographic waveforms often record unstable signals due to improper electrode contact and require inconvenient postures, leading to noise and inaccurate readings.
Innovation Solution
A wrist-worn biological information measurement device equipped with a blood pressure measurement unit, electrocardiographic waveform measurement unit, electrode contact state detection unit, and position detection unit, which includes a controller for determining the correctness of electrode contact and device position, allowing for simultaneous and accurate measurement of both parameters only when stable contact and appropriate posture are confirmed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the device is made portable and worn on the wrist, then ease of operation is improved, but measurement precision deteriorates due to unstable electrode contact and improper positioning
Solution Approach 1:
The device incorporates an electrode contact state detection unit that continuously monitors contact quality and provides feedback to the control unit. When contact is unstable, the system automatically issues warnings or interrupts measurement, preventing inaccurate readings while maintaining the portable design
Solution Approach 2:
The system performs preliminary detection of electrode contact state and device positioning before initiating measurement. This preliminary action ensures that measurement conditions are appropriate, preventing unstable recordings while preserving portability
2Ease of operation
If the user manually presses the measurement start button, then ease of operation is improved, but reliability deteriorates due to improper electrode contact after button press
Solution Approach 1:
After the user presses the measurement start button, the control unit immediately checks electrode contact state through the detection unit. If contact is improper, the system provides feedback by issuing warnings or interrupting measurement initiation, ensuring reliable data collection while maintaining simple manual operation
Solution Approach 2:
The system performs preliminary verification of electrode contact state immediately after button press but before actual measurement begins. This preliminary check prevents unreliable measurements while preserving the simplicity of manual start operation
3Measurement precision
If the device requires specific posture for blood pressure measurement, then measurement precision is improved, but ease of operation deteriorates due to inconvenient positioning requirements
Solution Approach 1:
The position detection unit continuously monitors device positioning and provides feedback to the control unit. When the device is not at the correct height relative to the heart, the system warns the user to adjust posture, ensuring accurate blood pressure measurements while guiding users through simple adjustments
4Productivity
If measurement is performed in unstable states, then productivity is improved by continuous measurement, but measurement precision deteriorates due to noise from improper contact
Solution Approach 1:
The electrode contact state detection unit provides continuous feedback during measurement. When unstable contact is detected, the control unit interrupts the measurement process, preventing noise contamination. This feedback mechanism maintains productivity by quickly resuming measurement once contact is stabilized
Solution Approach 2:
The system performs periodic checks of electrode contact state during measurement intervals. This periodic verification ensures that measurements are only recorded when contact is stable, maintaining signal quality while allowing continuous measurement capability
Data Source
AI summary
This biometric information measurement device is used while attached to a wrist of a human body, and comprises: a blood pressure measurement unit; an electrocardiographic waveform measurement unit provided with a plurality of electrodes and is for measuring electrocardiographic waveforms of the human body; an electrode contact state detection unit that detects the contact states of the human body with the plurality of electrodes; a position detection unit; a controller; a first determining unit that determines whether the device is positioned at a height within a predetermined range; a second determining unit that determines whether the human body is stably in contact with the plurality of electrodes; and a batch measurement controller that performs control for executing, in batches, the blood pressure measurement by unit of the blood pressure measurement unit and the measurement of the electrocardiographic waveforms of the human body by unit of the electrocardiographic waveform measurement unit.