Pulse Wave Estimation Device with Dynamic Measurement Period Control
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Solution Overview
Problem
Cuff-type electronic blood pressure meters face precision issues when estimating blood pressure in moving subjects or those making vocal sounds, and existing biological information processing devices take a long time to detect biosignals, leading to inefficiency.
Innovation Solution
A biological information estimating device with a detection unit, modifying unit, and estimating unit that detects pulse waves, determines the presence of disturbances, and adjusts the measurement period accordingly to enhance precision and reduce estimation time, using a combination of sensors for pulse wave detection, image processing, and motion analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement period is extended to improve blood pressure estimation precision, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The patent applies dynamics by making the measurement period adjustable rather than fixed. The controlling unit dynamically modifies the measurement period length based on disturbance detection results, allowing the system to adapt between longer periods for high precision and shorter periods for quick measurements when conditions permit
Solution Approach 2:
The patent changes the parameter of measurement period length based on detected disturbance conditions. When disturbances are detected, the measurement period is extended to improve precision; when no disturbances are present, the period is shortened to reduce measurement time, thus optimizing both precision and time efficiency
2Measurement precision
If the measurement period is extended to reduce the impact of disturbances, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The system dynamically adjusts the measurement period based on real-time disturbance detection. When disturbances are absent, the measurement period is shortened to maintain high productivity. When disturbances are detected, the period is extended to ensure precision, thus balancing both productivity and precision adaptively
Solution Approach 2:
The measurement period parameter is changed based on disturbance conditions detected during measurement. This allows the system to optimize between precision and productivity by using shorter periods for efficient measurements and longer periods when precision is compromised by disturbances
3Measurement precision
If disturbance detection and measurement period modification are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The controlling unit performs multiple functions: it controls the pressure applying unit, detects disturbances in pulse waves, determines measurement period length, and coordinates the estimating unit. By consolidating these functions in a single controlling unit, the patent avoids adding separate complex subsystems while achieving improved precision
4Measurement precision
If disturbance detection is performed continuously to improve precision, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The disturbance detection operates continuously throughout the measurement period to ensure precision is maintained. However, the measurement period itself is optimized to be as short as possible when disturbances are absent, reducing the total energy consumption while maintaining continuous detection capability
Data Source
AI summary
A biological information estimating device includes: a detection unit configured to detect a pulse wave on a living organism; a modifying unit configured to determine whether or not the pulse wave contains disturbance and to modify a length of a measurement period based on a result of the determination; and an estimating unit configured to estimate biological information from the pulse wave detected in the measurement period.