Wrist-Worn Biometric Sensor Cuff Segmentation
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Solution Overview
Problem
Existing portable devices struggle to simultaneously and accurately measure blood pressure and electrocardiographic waveforms due to difficulties in maintaining stable electrode contact with the body during cuff inflation.
Innovation Solution
A portable biological information measurement device is designed with a cuff system that includes a first cuff for compressing the artery, a second cuff for pressure detection, and a pressing unit with integrated electrodes to ensure stable contact, allowing for simultaneous and accurate measurement of blood pressure and electrocardiographic waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cuff is inflated to measure blood pressure, then blood pressure measurement is enabled, but stable electrode contact with the body surface becomes difficult
Solution Approach 1:
The device divides the measurement functions into separate components: a first cuff for blood pressure measurement and a second cuff for electrocardiographic measurement. This segmentation allows each cuff to be optimized for its specific function, with the blood pressure cuff inflatable for accurate BP measurement while the ECG cuff maintains stable electrode contact independently.
Solution Approach 2:
The patent introduces a pressing unit as an intermediary component that applies pressure to the second cuff during blood pressure measurement. This pressing unit ensures that the electrodes on the second cuff maintain stable contact with the body surface even when the first cuff is inflated, thereby preserving ECG measurement reliability during BP measurement.
2Device complexity
If electrodes are provided in a cuff or main body case, then device structure is simplified, but stable electrode contact with body surface cannot be maintained during cuff inflation
Solution Approach 1:
The device separates the electrode housing from the blood pressure cuff by placing electrodes in a dedicated second cuff. This segmentation allows the ECG measurement components to be physically separated from the inflating blood pressure cuff, ensuring that electrode contact stability is not compromised by cuff inflation while maintaining a relatively simple overall device structure.
Solution Approach 2:
The pressing unit serves as an intermediary mechanism that actively maintains electrode contact stability during blood pressure measurement. By applying controlled pressure to the second cuff containing the electrodes, the pressing unit ensures reliable body surface contact independent of the blood pressure cuff's inflation state, thereby preserving measurement precision.
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
The device enables accurate and simultaneous measurement of blood pressure and electrocardiographic waveforms by maintaining electrode contact during cuff inflation, improving measurement precision and reliability.
Implementation Method 1
an electrocardiographic waveform measurement unit that measures an electrocardiographic waveform of the human body based on a potential difference when the first electrode and the second electrode are in contact with the human body
Implementation Method 2
a second cuff located on a side closer to the wrist than the first cuff in the state of being attached to the wrist and detecting a pressure change caused by pulsation of the artery
Data Source
AI summary
A biological information measurement device used by being attached to a wrist of a human body, including a main body including at least a power source unit, an electrocardiographic waveform measurement unit that measures an electrocardiographic waveform of the human body based on a first electrode, a second electrode, and a potential difference when the first electrode and the second electrode are in contact with the human body, a first cuff that applies a force compressing an artery present in the wrist in a state of being attached to the wrist, a second cuff located on a side closer to the wrist than the first cuff in the state of being attached to the wrist and detecting a pressure change caused by pulsation of the artery, a pressing unit disposed between the first cuff and the second cuff, and a blood pressure measurement unit.