Wearable Blood Pressure Cuff Layout for Stable ECG Sensor Contact
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Solution Overview
Problem
Existing portable electrocardiograph measurement devices experience accuracy issues due to varying contact areas between electrodes and skin during blood pressure measurements, caused by cuff inflation.
Innovation Solution
A biological information measurement device with a cuff arrangement that suppresses changes in sensor contact with the arm by positioning sensors at specific points relative to the inflation vectors of the cuffs, ensuring stable contact during inflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cuff is inflated to measure blood pressure, then blood pressure measurement is enabled, but the contact area between the electrodes and skin varies causing electrocardiographic signal accuracy to deteriorate
Solution Approach 1:
The sensor is pre-positioned at the change suppression position on the bottom portion before cuff inflation occurs. This preliminary positioning ensures that when the cuff is inflated for blood pressure measurement, the sensor remains at a location where contact state changes are minimized, thus maintaining electrocardiographic signal accuracy throughout the measurement process
Solution Approach 2:
The invention applies local quality by identifying and utilizing a specific location (change suppression position) on the bottom portion where the contact state characteristics differ from other areas. This localized approach allows the sensor to be placed precisely where cuff inflation has minimal impact on contact stability, resolving the contradiction between enabling blood pressure measurement and maintaining electrocardiographic signal accuracy
2Productivity
If the cuff is inflated during blood pressure measurement, then blood pressure can be measured, but the main body portion becomes inclined and sensor contact state changes
Solution Approach 1:
The sensor is pre-positioned at the change suppression position on the bottom portion before cuff inflation occurs. This preliminary positioning ensures that when the cuff is inflated for blood pressure measurement, the sensor remains at a location where contact state changes are minimized, thus maintaining electrocardiographic signal accuracy throughout the measurement process
Solution Approach 2:
The invention applies local quality by identifying and utilizing a specific location (change suppression position) on the bottom portion where the contact state characteristics differ from other areas. This localized approach allows the sensor to be placed precisely where cuff inflation has minimal impact on contact stability, resolving the contradiction between enabling blood pressure measurement and maintaining electrocardiographic signal accuracy
Data Source
AI summary
A biological information measurement device includes a blood pressure measurement unit with a cuff for assessing human blood pressure, and a unit for capturing other vitals. A flexible belt wraps and secures around the arm's outer circumference, positioning the cuff internally against the skin. The cuff enables inflation for pressure readings. The device features a main body with a bottom surface that contacts the arm during wear. Embedded in this bottom is a sensor that directly touches the arm to monitor additional biological data, e.g., pulse or oxygenation. Multiple cuffs align along the belt's length for enhanced accuracy. The sensor is placed at a “change suppression position” on the bottom surface, minimizing disruptions to sensor-arm contact during inflation. It lies along the extension of a resultant force vector, calculated by combining directional forces from the arm's central axis toward the peak inflation zones of each cuff, ensuring stable measurements.