Oxygen Circulation Time Measurement Breath-Hold Control

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Solution Overview

Problem

Existing biological information measurement apparatuses require complex algorithms to determine appropriate waveform patterns for oxygen circulation time measurements, making the process cumbersome and burdensome, especially when test subjects hold their breath with varying lung volumes, leading to inaccurate inflection point identification.

Innovation Solution

A biological information measurement apparatus that notifies the test subject to resume breathing before a subsequent oxygen circulation time measurement, allowing for a simplified determination of appropriate waveform patterns by correlating IR and red light signals to assess blood oxygen concentration changes, thereby reducing the complexity of determining the inflection point.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If complex algorithms are used to determine appropriate waveform patterns for oxygen circulation time measurements, then measurement precision may be improved, but device complexity and computational burden increase

Engineering Contradiction:

Improveinflection point identification accuracyVSAvoiddetermination algorithm complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent changes the parameter of breath-hold duration from a fixed predetermined time to a dynamically adjusted parameter. The control unit adjusts the breath-hold duration based on real-time oxygen saturation changes, specifically extending the breath-hold when the oxygen saturation change rate falls within a predetermined range. This parameter adaptation simplifies waveform pattern determination while maintaining measurement precision.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple oxygen circulation time measurements are performed sequentially with complete separation between measurements, then measurement reliability is improved, but measurement time increases

Engineering Contradiction:

Improvemeasurement reliabilityVSAvoidtotal measurement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by initiating the second oxygen circulation time measurement before the first measurement is completely finished. The control unit starts the second measurement during the oxygen-circulation-time measurement period of the first measurement, allowing overlapping execution. This reduces the total measurement time while maintaining reliability through proper waveform pattern determination.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements continuity of useful action by allowing multiple oxygen circulation time measurements to overlap and execute concurrently rather than sequentially. The control unit manages multiple measurements simultaneously, with the oxygen saturation measurement continuing throughout the entire period. This continuous operation eliminates idle time between measurements while maintaining data quality through appropriate waveform selection.

Inventive Principle:

Principle #20Continuity of useful action

3Ease of operation

If test subjects hold their breath with varying lung volumes, then ease of operation is improved, but waveform pattern appropriateness and inflection point identification deteriorate

Engineering Contradiction:

Improvebreath-hold instruction simplicityVSAvoidwaveform pattern appropriateness

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent implements feedback by continuously monitoring the oxygen saturation change rate during the breath-hold period and using this information to adjust the breath-hold duration. The control unit extends the breath-hold when the oxygen saturation change rate is within a predetermined range, ensuring that sufficient oxygen consumption occurs to produce an appropriate waveform pattern with identifiable inflection points, regardless of the initial lung volume.

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 approach simplifies the determination of appropriate waveform patterns, shortens the time required for multiple oxygen circulation time measurements, and improves the accuracy of blood oxygen concentration changes assessment, reducing the computational burden and enhancing measurement efficiency.

Implementation Method 1

a first signal representing a change in the amount of light of a first wavelength detected from a living body and a second signal representing a change in the amount of light of a second wavelength detected from the living body

Methodology Applied

Scientific EffectAbsorption Spectroscopy: Absorption Spectroscopy

Implementation Method 2

a light receiving element that receives the infrared light and the red light

Methodology Applied

Scientific EffectPhotoelectric Effect: Photoelectric Effect

Data Source

PatentUS20230071410A1Biological information measurement apparatus and non-transitory computer readable medium

Publication Date: 2023.03.09 FUJIFILM BUSINESS INNOVATION CORP

AI summary

A biological information measurement apparatus includes a processor configured to: if a predetermined number of plural measurements of an oxygen circulation time are to be performed, before a predetermined oxygen-circulation-time measurement period ends during a first measurement of the oxygen circulation time, notify a test subject of a breath-hold instruction as a preparation for a second measurement of the oxygen circulation time, the test subject being a person for whom the oxygen circulation time is measured, the second measurement being a subsequent measurement to the first measurement.