Blood Pressure Measurement Device Using Optical Detection and Dynamic Interval Control

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Solution Overview

Problem

Existing blood pressure measurement technologies, such as those using cuffs, disrupt sleep and fail to detect nocturnal hypertension and environmental-induced blood pressure fluctuations effectively.

Innovation Solution

A blood pressure measurement device that includes a measurement wave detection unit, blood pressure analysis unit, state determination unit, and measurement control unit to noninvasively detect blood pressure fluctuations by analyzing detection signals, shortening measurement intervals during sleep or environmental changes, and determining abnormal blood pressure conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a cuff is used to measure blood pressure, then measurement accuracy is improved, but sleep is disturbed and physical load on the subject increases

Engineering Contradiction:

Improveblood pressure measurement accuracyVSAvoidsleep disturbance and physical load

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical cuff-based measurement system with an optical measurement system using light emission and detection. The light emitter irradiates the measurement region, and the light receiver detects transmitted light to generate detection signals for blood pressure analysis, eliminating the need for mechanical cuff pressurization

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces light as an intermediary medium to transmit measurement information through the body tissue. By measuring the attenuation characteristics of light passing through the measurement region, the system indirectly obtains blood pressure information without direct mechanical contact

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If blood pressure is measured only before and after sleep period, then device operation is simplified, but nocturnal hypertension and environmental-induced blood pressure fluctuations cannot be detected

Engineering Contradiction:

Improvemeasurement frequency controlVSAvoiddetection of blood pressure abnormalities

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent implements dynamic measurement interval adjustment based on detected blood pressure change rates. When the change rate exceeds a threshold, the measurement interval is automatically shortened to increase monitoring frequency, allowing detection of abnormal blood pressure fluctuations while maintaining simplicity during normal conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors blood pressure change rates and uses this feedback to adjust measurement intervals. The measurement control unit shortens intervals when abnormal changes are detected, creating a closed-loop system that adapts monitoring intensity to actual physiological conditions

Inventive Principle:

Principle #23Feedback

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

This solution reduces physical load on the subject, allows continuous blood pressure monitoring without disturbing sleep, and enables early detection of abnormal blood pressure fluctuations, particularly during nocturnal hypertension and environmental changes.

Implementation Method 1

a measurement wave detection unit that detects a measurement wave that passed through a measurement region of a subject and generates a detection signal

Methodology Applied

Scientific EffectOptical absorption: Absorption (EM radiation)

Data Source

PatentUS11179045B2Blood pressure measurement device and blood pressure measurement method

Publication Date: 2021.11.23 SEIKO EPSON CORP

AI summary

A blood pressure measurement device including a measurement wave detection unit that detects a measurement wave that passed through a measurement region of a subject and generates a detection signal, a blood pressure analysis unit that repeatedly identifies a blood pressure of the subject by analyzing the detection signal, a state determination unit that determines whether or not the subject is in a sleep state, a change determination unit that determines whether or not a time change rate of the blood pressure exceeds a threshold value, and a measurement control unit that shortens a time interval where the blood pressure analysis unit identifies the blood pressure in a case where the state determination unit determines that the subject is in the sleep state and the change determination unit determines that the time change rate exceeds the threshold value.