Biological State Estimation Using Pulse Wave Reference Points
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Solution Overview
Problem
Conventional devices face difficulties in accurately extracting electrocardiographic feature amounts from waveforms with large amounts of noise, as they rely solely on the pulse waveform for supplementation, which can be affected by noise as well.
Innovation Solution
A biological state estimation device that includes units for acquiring and extracting feature amounts from both electrocardiographic and pulse waveforms, with quality determination units to set reference points for accurate extraction, even in noisy conditions, using the pulse waveform to aid in extracting features from the electrocardiographic waveform when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feature amount extraction relies solely on the electrocardiographic waveform, then extraction simplicity is maintained, but extraction accuracy deteriorates when noise is present
Solution Approach 1:
The patent introduces a pulse waveform as an intermediary reference to help extract feature amounts from the electrocardiographic waveform. When noise makes direct extraction difficult, the system uses the pulse waveform's feature amounts (such as peak positions or intervals) as reference points to locate and extract corresponding features from the electrocardiographic waveform, thereby improving accuracy without requiring complete reliance on the noisy signal alone
Solution Approach 2:
The system changes the extraction approach by switching between two different parameter sets: when the electrocardiographic waveform quality is good, it extracts features directly from that waveform; when noise degrades quality, it switches to using pulse waveform parameters as references. This dynamic parameter change allows the system to adapt to varying signal conditions and maintain high extraction accuracy across different noise levels
2Reliability
If pulse waveform is used to supplement feature extraction, then extraction reliability improves, but measurement precision deteriorates due to noise affecting pulse waveform
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously evaluates the quality of both the electrocardiographic and pulse waveforms, and dynamically adjusts which signal's feature amounts are used for extraction. The quality determination unit provides feedback about signal conditions, allowing the system to switch between using electrocardiographic features directly or using pulse waveform features as references, thereby maintaining both reliability and precision under varying noise conditions
3Loss of information
If electrocardiographic waveform is not searched when noise is large, then processing simplicity is maintained, but information loss increases
Solution Approach 1:
The system performs preliminary quality assessment of both waveforms before extraction begins. By evaluating the signal quality in advance, the system can pre-determine whether to proceed with direct electrocardiographic feature extraction or to switch to using pulse waveform references, avoiding unnecessary processing steps while ensuring complete information extraction when needed
Data Source
AI summary
A biological state estimation device that estimates a biological state based on at least an electrocardiographic feature amount and comprises an electrocardiographic waveform acquisition unit; an electrocardiographic feature amount extraction unit, a pulse waveform acquisition unit; a pulse wave feature amount extraction unit an electrocardiographic waveform quality determination unit; a first search reference point setting unit for setting a first reference point for searching the electrocardiographic waveform when the electrocardiographic waveform is of quality to enable extraction of the electrocardiographic feature amount; and a second search reference point setting unit that sets a second reference point for searching the electrocardiographic waveform on the basis of the pulse wave feature amount when the electrocardiographic waveform is of quality to enable extraction of the electrocardiographic feature amount. The electrocardiographic feature amount extraction unit searches the electrocardiographic waveform based on the first reference point or the second reference point an.