Wrist Pulse Wave Sensor Pressure Feedback for Faster Calibration
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Solution Overview
Problem
Existing pulse wave measurement devices require time-consuming pressure adjustments to ensure optimal sensor contact, leading to uncertainty and potential errors in measurement timing.
Innovation Solution
A pulse wave measurement device with a strain gauge and adjustable pressing mechanism that compares digital signal voltage levels to predefined ranges to automatically adjust pressure for optimal sensor contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure is continuously increased until the maximum and minimum values no longer change, then the measurement precision is improved, but the time taken for adjustment increases
Solution Approach 1:
The patent replaces the mechanical trial-and-error pressure adjustment method with an automated control system that uses voltage level detection and digital signal processing. The controller automatically adjusts pressure based on voltage threshold comparisons, eliminating the need for manual continuous adjustment and reducing adjustment time while maintaining measurement precision.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors the voltage level of the pulse wave signal and compares it against predetermined thresholds. Based on this feedback, the controller automatically adjusts the pressing force to optimize the signal quality, ensuring precise measurements without time-consuming manual adjustment.
2Ease of operation
If the pressure adjustment process is simplified, then the ease of operation is improved, but the measurement precision may deteriorate
Solution Approach 1:
The patent enables the measurement device to self-adjust the pressure automatically based on voltage level detection. The controller monitors the pulse wave signal characteristics and autonomously optimizes the pressing force, eliminating the need for user intervention while ensuring optimal measurement conditions are achieved.
Solution Approach 2:
The patent replaces manual mechanical pressure adjustment with an automated electronic control system that uses voltage threshold comparisons to determine optimal pressure levels, making the device easier to operate while maintaining measurement precision through objective digital signal analysis.
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 quickly adjusts pressure to minimize errors and ensure accurate pulse wave measurements by comparing voltage levels to predefined thresholds, reducing the time required for setup.
Implementation Method 1
a pulse wave sensor including a strain gauge and configured to acquire a pulse wave by measuring a pulse of a radial artery
Data Source
AI summary
The present invention is a method of adjusting a pulse wave measurement device attachable to a user's wrist. The pulse wave measurement device includes: a pulse wave sensor including a strain gauge and configured to acquire pulse wave by measuring radial artery pulse; pressing part for pressing the pulse wave sensor to the radial artery; and output part for outputting a measured value of the pulse wave sensor as digital signal. The adjusting method includes: acquiring pulse wave using pulse wave sensor when the pulse wave measurement device is attached to user's wrist, and outputting measured value thus acquired, as a digital signal; comparing voltage level of the digital signal with a range previously set with respect to maximum voltage level of output part; and adjusting or instructing pressing force on pulse wave sensor in a case where voltage level of the digital signal is outside the previously set range.