Biological Signal Abnormality Detection with Dual-Period Monitoring

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Solution Overview

Problem

Existing abnormality determination systems fail to accurately detect when a patient's condition worsens despite biological information values returning to normal, leading to delayed or missed notifications, especially when the patient is close to death.

Innovation Solution

An apparatus and method that utilize a sensor to acquire biological signals, determining if the signals are outside a predetermined range for a first time period and then inside for a longer second period, activating an alarm if the signals remain within the normal range during the second period, especially when activity levels are low, indicating the patient may be close to death.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the system issues an alert when biological information values are outside the normal range, then the detection speed is improved, but false alerts are generated when the patient is actually deteriorating despite values returning to normal

Engineering Contradiction:

Improveabnormality detection accuracyVSAvoidalert reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system performs preliminary monitoring of biological information values over a first time period before issuing an alert. By establishing a baseline of abnormal values and then monitoring for their resolution, the system prepares in advance to distinguish between temporary fluctuations and actual recovery, preventing false alerts while maintaining detection sensitivity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements a feedback mechanism where the resolution of abnormal biological information values triggers a second monitoring period. During this second period, the system continuously checks whether values remain within the normal range. This feedback loop ensures that alerts are only issued when recovery is sustained, not when values temporarily return to normal, thereby improving alert reliability.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If the system monitors biological information values continuously, then the detection accuracy is improved, but the response time to actual deterioration is delayed when values temporarily return to normal

Engineering Contradiction:

Improvecondition assessment accuracyVSAvoidnotification delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system employs periodic monitoring with two distinct time periods: a first time period to detect abnormal values and a second time period to confirm their resolution. This periodic structure allows the system to assess conditions at multiple intervals, ensuring that temporary fluctuations are not mistaken for sustained recovery, thereby maintaining detection accuracy without excessive delay.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary detection of abnormal values during the first time period, establishing a basis for subsequent monitoring. This preliminary action enables the system to prepare for the second monitoring period, reducing the overall time to issue accurate alerts by having already identified the abnormal condition before confirmation is needed.

Inventive Principle:

Principle #10Preliminary action

3Speed

If the system issues alerts based on single measurements, then the response speed is improved, but the reliability of detection is reduced due to temporary fluctuations

Engineering Contradiction:

Improvealert response speedVSAvoiddetection reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The system uses periodic measurements across two time periods instead of relying on a single measurement. The first period captures abnormal values, and the second period confirms their resolution. This periodic approach maintains fast response by immediately detecting the initial abnormality while ensuring reliability through sustained monitoring, preventing false alerts from temporary fluctuations.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system performs preliminary detection during the first time period to quickly identify abnormal conditions, maintaining fast response speed. This preliminary detection is followed by a second monitoring period that confirms the persistence or resolution of abnormal values, ensuring detection reliability without sacrificing the initial rapid response capability.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11547298B2Abnormality determination apparatus and non-transitory computer readable medium storing program

Publication Date: 2023.01.10 PARAMOUNT BED CO LTD

AI summary

One aspect of the apparatus comprising, a sensor configured to acquire a biological signal of a user, and a controller configured to, determine whether the biological signal is continuously outside a predetermined range for a first time period, after determining that the biological signal has been continuously outside the predetermined range for the first time period, then determine whether the biological signal is inside the predetermined range, and activate an alarm if the controller has determined that (i) the biological signal has been outside the predetermined range for the first time period, and (ii) the biological signal has been continuously inside the predetermined range for a second time period, the second time period being longer than the first time period.