Pulse Wave Analysis Device Beat Exclusion Mechanism

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Solution Overview

Problem

Existing pulse wave analysis methods are prone to errors due to arrhythmia and body movement, leading to low-precision measurements of pulse wave analysis indices like pulse wave velocity, which are crucial for diagnosing conditions such as arterial sclerosis.

Innovation Solution

A pulse wave analysis device that integrates pulse waveform shapes from multiple beats, calculates a degree of approximation, and excludes beats with low approximation to ensure stability, thereby providing a highly precise pulse wave analysis index by focusing on stable beats.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If pulse waves for all beats are used in the calculation of the pulse wave analysis index, then the quantity of data used for calculation is maximized, but the measurement precision degrades due to arrhythmia and body movement disruptions

Engineering Contradiction:

Improvequantity of pulse wave dataVSAvoidpulse wave analysis index precision

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The pulse wave data is segmented into individual beats, and each beat is evaluated separately for quality metrics (arrhythmia detection, body movement detection). This allows selective inclusion or exclusion of specific beats from the calculation, thereby maintaining measurement precision while still utilizing multiple beats where available.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different quality assessment criteria are applied to different beats based on their individual characteristics. Beats exhibiting arrhythmia or body movement are identified and excluded from calculation, while high-quality beats are retained. This local quality control ensures that only reliable data contributes to the final pulse wave analysis index.

Inventive Principle:

Principle #3Local quality

2Productivity

If pulse wave data including disrupted beats is used for calculation, then the productivity of measurement is maintained, but the reliability of the diagnostic index decreases

Engineering Contradiction:

Improvemeasurement efficiencyVSAvoiddiagnostic index reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

Quality assessment of each pulse wave beat is performed in advance before the actual calculation of the pulse wave analysis index. Beats are pre-screened for arrhythmia and body movement, and only those meeting quality criteria are included in the final calculation. This preliminary filtering action ensures high reliability without compromising measurement efficiency.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system automatically performs quality assessment and selective inclusion/exclusion of beats without requiring manual intervention. The pulse wave analysis device itself services the quality control function, identifying and excluding disrupted beats while maintaining measurement productivity through automated processing.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9044145B2Pulse wave analysis device and recording medium

Publication Date: 2015.06.02 FUKUDA DENSHI CO LTD

AI summary

A pulse wave analysis device stores a pulse waveform for multiple beats, and calculates a pulse wave analysis index by analyzing the pulse waveform. In the calculation of the pulse wave analysis index, pulse waveform shapes of each beat that constitute the pulse waveform for multiple beats are integrated, and beats for which a degree of approximation between the integrated pulse waveform shape and the pulse waveform shape of the beat is low are excluded as targets of calculation of the pulse wave analysis index.