Wrist Sphygmomanometer Algorithm Switching for Nighttime Posture

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Solution Overview

Problem

Wrist-type sphygmomanometers face challenges in accurately and stably measuring blood pressure during nighttime (sleep) measurements due to high positional freedom, leading to instability in determining the correct measurement posture.

Innovation Solution

A sphygmomanometer that temporarily presses the wrist with a blood pressure measuring cuff, featuring a mode operation unit to switch between normal and nighttime measurement modes, an algorithm storage unit with algorithms for sitting and supine positions, and a switching unit to adjust the algorithm based on the measurement mode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If a wrist-type sphygmomanometer is used for nighttime blood pressure measurement, then the measurement can be performed automatically according to a predetermined schedule, but the measurement accuracy deteriorates due to high degree of freedom in position and instability in determining measurement posture

Engineering Contradiction:

Improveautomatic blood pressure measurementVSAvoidblood pressure measurement accuracy

Core Design Contradiction:

Extent of automationVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by switching between different blood pressure calculation algorithms based on the measurement mode. Specifically, it uses a first algorithm for normal blood pressure measurement mode and a second algorithm for nighttime blood pressure measurement mode. This allows the system to adapt the calculation parameters to the specific measurement conditions, thereby maintaining measurement accuracy despite the high degree of positional freedom during nighttime measurements.

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a single blood pressure calculation algorithm is used for both normal and nighttime measurement modes, then the device complexity is reduced, but the measurement accuracy deteriorates in nighttime mode due to posture determination instability

Engineering Contradiction:

Improvealgorithm configurationVSAvoidblood pressure calculation accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent implements dynamics by making the blood pressure calculation algorithm switchable rather than fixed. The system dynamically selects between a first algorithm for normal measurement mode and a second algorithm for nighttime measurement mode based on the operational mode. This dynamic adaptation allows the system to optimize measurement accuracy for each specific scenario without requiring complex manual configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the calculation parameters by employing different algorithms for different measurement modes. The first algorithm is optimized for normal blood pressure measurement while the second algorithm is specifically designed for nighttime measurement conditions. This parameter differentiation enables accurate blood pressure calculation despite the instability in posture determination during nighttime measurements.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If posture determination conditions are switched between normal and nighttime measurement modes, then the measurement accuracy is improved, but the device complexity increases due to multiple algorithm configurations

Engineering Contradiction:

Improvemeasurement posture determination accuracyVSAvoidalgorithm storage and switching

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the blood pressure calculation into separate algorithms for different measurement modes. Instead of using a single complex algorithm that tries to handle all scenarios, the system segments the calculation logic into a first algorithm for normal measurement mode and a second algorithm for nighttime measurement mode. This segmentation simplifies the overall system design while improving accuracy for each specific mode.

Inventive Principle:

Principle #1Segmentation

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 stable and accurate blood pressure calculation in both normal and nighttime measurement modes by adjusting the calculation algorithm based on the user's posture, thereby improving measurement accuracy and user convenience.

Implementation Method 1

performs blood pressure measurement by an oscillometric method

Methodology Applied

Scientific EffectOscillometric method:

Data Source

PatentUS12303241B2Sphygmomanometer, blood pressure calculation method, and computer-readable recording medium

Publication Date: 2025.05.20 OMRON HEALTHCARE CO LTD

AI summary

The present invention has a normal blood pressure measurement mode in which a blood pressure measurement is performed according to a blood pressure measurement instruction, and a nighttime blood pressure measurement mode in which a blood pressure measurement is automatically started according to a predetermined schedule. When being switched by an mode operation unit from the normal blood pressure measurement mode to the nighttime blood pressure measurement mode, an algorithm for blood pressure calculation by an oscillometric method is switched and set from an algorithm for a sitting position to an algorithm for a supine position. A blood pressure value is calculated using an algorithm currently set for the blood pressure calculation by the oscillometric method.