Pulse Measurement Device Pressure Control for Exercise
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Solution Overview
Problem
Conventional pulse measurement methods using photoplethysmography (PPG) sensors are hindered by motion artifacts and instability during exercise, making real-time and continuous pulse analysis impossible due to interference from noise and light, and the frequency of the PPG signal becoming consistent with acceleration signals as activity levels increase.
Innovation Solution
A pulse measurement device and method that includes a sensing unit for PPG and acceleration signals, a pressure control unit to adjust pressure based on exercise level, and a signal determination unit to establish an optimum pressure range for stable signal detection, along with a light amount control unit to increase light when necessary to prevent signal weakening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure is increased to stabilize the PPG sensor during exercise, then measurement reliability improves, but the PPG signal weakens due to excessive pressurization
Solution Approach 1:
The patent implements dynamic pressure adjustment based on detected exercise intensity. The control unit modifies the pressure applied by the wearable device to the PPG sensor in real-time according to the user's activity level, allowing the system to maintain optimal signal quality across varying exercise conditions rather than using fixed pressure
Solution Approach 2:
The system changes the pressure parameter adaptively based on exercise detection. When exercise is detected, the control unit adjusts the pressure parameter to an optimized level that prevents both excessive pressure (which weakens signals) and insufficient pressure (which allows motion artifacts), thereby maintaining measurement precision across different activity states
2Ease of operation
If the device is made wearable and portable, then ease of operation improves, but measurement precision deteriorates due to motion artifacts
Solution Approach 1:
The patent employs feedback mechanisms where the system continuously monitors exercise intensity through acceleration sensors and other indicators, then uses this information to adjust pressure and light parameters in real-time. This closed-loop control compensates for motion artifacts by adapting measurement conditions based on the detected level of user activity
Solution Approach 2:
The system dynamically adjusts its measurement parameters based on real-time detection of exercise intensity. By making the pressure and light emission adaptable rather than static, the device maintains measurement precision while preserving the benefits of wearability and portability
3Productivity
If exercise intensity increases, then productivity of exercise monitoring improves, but signal quality deteriorates due to motion artifacts and noise
Solution Approach 1:
The patent makes the measurement system dynamic by continuously adapting pressure and light emission parameters based on detected exercise intensity. This allows the system to maintain signal quality even as exercise intensity increases, enabling continuous monitoring across the full range of activity levels without signal degradation
Solution Approach 2:
The system changes multiple parameters simultaneously - increasing light emission intensity and adjusting pressure levels - in response to detected exercise intensity. These coordinated parameter changes compensate for the deteriorating signal quality that would otherwise occur during high-intensity exercise
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
Enables precise and stable pulse measurement during exercise by automatically controlling pressure and light levels, reducing noise interference and maintaining clear signal detection, thus improving user convenience and accuracy.
Implementation Method 1
a photoplethysmograph (PPG) is a device that detects the perfusion of blood through tissue by shining light through it. PPG works by shining infrared light through a capillary bed. As arterial pulsations fill the capillary bed, the changes in volume of the vessels modify the absoption, reflection, and scattering of the light.
Implementation Method 2
a sensing unit to sense a photoplethysmography (PPG) signal and an acceleration signal obtained from a user
Data Source
AI summary
A pulse measurement device for more precisely measuring a pulse, including a sensing unit to sense a photoplethysmography (PPG) signal and an acceleration signal obtained from a user, a pressure control unit to control pressure applied to the sensing unit, and a signal determination unit to determine an optimum pressure range by analyzing the PPG signal varying with a change of the pressure applied to the sensing unit by the pressure control unit and to determine an exercise level of the user by using the acceleration signal.