Blood Pressure Measurement Device Using High-Frequency Cuff Pressure Oscillation
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Solution Overview
Problem
Conventional blood pressure measurement methods using the volume compensation method require at least 30 seconds to decide the control target value (V0), which can lead to prolonged measurement times and interruptions during continuous monitoring due to changes in blood pressure or environmental factors.
Innovation Solution
A blood pressure information measurement device that rapidly changes cuff pressure within one heartbeat to detect the inflection point of the artery volume signal, allowing for instantaneous decision of the control target value V0, thereby reducing the time required for measurement initiation and continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the control target value V0 is decided by gradually compressing the artery and detecting the maximum point of artery volume change signal, then the measurement precision is improved, but the measurement time is prolonged to at least 30 seconds
Solution Approach 1:
The invention applies periodic high-frequency small pressure oscillation (e.g., 20 Hz sine wave pressure oscillation of 10 mmHg) superimposed on the cuff pressure to rapidly elicit artery volume change signals. This periodic action allows the system to detect the maximum point of volume change and decide V0 within about 10 seconds, dramatically reducing the time compared to gradual compression methods while maintaining measurement precision
Solution Approach 2:
The invention changes the pressure application mode from gradual static compression to dynamic oscillating pressure with high frequency components. By introducing high-frequency pressure oscillation, the artery volume signal responds more rapidly, enabling fast detection of the maximum point and quick decision of V0 without sacrificing the precision that would otherwise require prolonged gradual compression
2Reliability
If V0 is re-decided for each continuous measurement to account for changes in blood pressure, stress, and environmental factors, then the reliability is improved, but the measurement time is prolonged with interruptions
Solution Approach 1:
By using periodic high-frequency pressure oscillation for V0 decision, the re-decision process that occurs during continuous measurement takes only about 10 seconds instead of 30+ seconds. This reduces the interruption time significantly, allowing continuous blood pressure monitoring to proceed with minimal breaks while maintaining reliability through frequent V0 updates
Solution Approach 2:
The reduced V0 decision time enables the system to maintain continuous blood pressure measurement with minimal interruptions. The useful action of monitoring blood pressure continues almost uninterrupted, as the brief 10-second V0 re-decision periods are much shorter than the traditional 30+ second interruptions, thereby improving the continuity and reliability of monitoring
3Loss of time
If high-frequency small pressure oscillation is used to shorten V0 decision time, then the measurement time is reduced to about 10 seconds, but the pressurization speed must be suppressed to ensure decision precision
Solution Approach 1:
The system uses periodic high-frequency pressure oscillation that can be applied at relatively high pressurization speeds without compromising V0 decision precision. The oscillatory nature of the pressure application allows rapid pressurization while the frequency and amplitude characteristics ensure that the artery volume signal still produces a detectable maximum point, thus achieving both speed and precision
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 rapid and precise determination of the control target value V0, significantly shortening the time needed for blood pressure measurement and allowing continuous monitoring without interruptions.
Implementation Method 1
an artery is compressed by a cuff from the outside of a living body, so that a volume of the artery pulsating in synchronization with a heartbeat is always maintained to be constant
Implementation Method 2
a volume detector arranged at a predetermined position of the cuff, the volume detector for detecting an artery volume signal indicating the volume of the artery
Implementation Method 3
a pressure detector for detecting cuff pressure representing the pressure in the cuff
Data Source
AI summary
A blood pressure information measurement device instantaneously changes cuff pressure in a specified pressure section in order to detect a control target value in artery volume constant control. An artery volume signal is detected in that period, and an inflection point of the detected artery volume signal is detected by performing differentiation processing or the like. The inflection point of the detected artery volume signal is fixed as the control target value.