Cuffless Bio-Information Estimation Using Force-Normalized Pulse Wave DC Components
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Solution Overview
Problem
Current cuffless blood pressure measurement methods face challenges in accurately estimating bio-information due to difficulties in controlling the pressing force applied during pulse wave signal measurement, leading to reduced accuracy in estimating bio-parameters like blood pressure and vascular health indicators.
Innovation Solution
A device and method that utilize a pulse wave sensor and force sensor to measure and normalize DC components of pulse wave signals, using a reference force to improve accuracy in estimating bio-information such as blood pressure, vascular age, and arterial stiffness by normalizing the signals based on contact force information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cuffless blood pressure measurement is performed without force control, then measurement convenience is improved, but measurement precision deteriorates
Solution Approach 1:
The system measures the actual pressing force applied by the user during pulse wave signal acquisition and uses this force information to normalize the DC components of the pulse wave signal. This feedback mechanism allows the system to compensate for variations in pressing force, maintaining measurement precision while preserving the convenience of cuffless measurement.
Solution Approach 2:
The system changes the parameter of DC component normalization based on the measured pressing force. By adjusting the normalization reference according to the actual force applied, the system adapts to different measurement conditions and maintains accurate blood pressure estimation despite variations in user application force.
2Measurement precision
If pressing force is increased to improve signal quality, then measurement precision is improved, but user comfort deteriorates
Solution Approach 1:
The force sensor provides real-time feedback on the pressing force applied by the user. The system uses this feedback to normalize the pulse wave signal, allowing accurate measurement even with gentle pressing. This eliminates the need for strong pressing force, thereby maintaining signal quality while improving user comfort.
3Device complexity
If multiple DC components are normalized without force information, then processing complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system incorporates force sensor feedback to guide the normalization process of multiple DC components. By using the measured pressing force as a reference for normalization, the system maintains simple processing while significantly improving the accuracy of blood pressure and other bio-information estimation.
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
Enhances the accuracy of bio-information estimation by normalizing the pulse wave signals, allowing for precise monitoring of health conditions and providing reliable bio-data for user health monitoring and warning systems.
Implementation Method 1
a light source configured to emit light onto the object that is in contact with the pulse wave sensor and a detector configured to detect light that is reflected from the object
Data Source
AI summary
An apparatus for estimating bio-information includes a pulse wave sensor configured to measure a pulse wave signal from an object, for a predetermined period of time, a processor configured to extract DC components of the pulse wave signal measured for the predetermined period of time, normalize the extracted DC components, based on at least one of the extracted DC components of the pulse wave signal measured at a time when a reference force is applied by the object to the pulse wave sensor, and estimate the bio-information, based on the normalized DC components.