Bed Load Sensor Waveform Normalization for Heart Rate Accuracy
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Solution Overview
Problem
Existing biological information monitoring systems face challenges in accurately calculating biological information due to various error factors introduced by load detectors.
Innovation Solution
A biological information monitoring system that includes load detectors, a waveform calculation unit, and a biological information calculation unit. The system calculates waveforms based on detected load values and uses these waveforms to accurately determine respiration rates and heart rates, employing multiple calculation methods, including peak detection and normalization, to mitigate errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If load detectors are used to detect biological information, then the monitoring capability is provided, but measurement precision deteriorates due to error factors
Solution Approach 1:
The patent applies parameter changes by transforming the raw load signal into a normalized waveform that removes amplitude variations. This normalization process changes the parameter representation from absolute load values to relative waveform patterns, thereby eliminating error factors related to loading conditions and improving measurement precision while maintaining monitoring capability
Solution Approach 2:
The patent introduces an intermediary processing step between load detection and biological information calculation. The waveform calculation unit acts as an intermediary that processes the raw load signal through normalization and waveform transformation, separating the useful respiratory/heartbeat information from error factors before final calculation
2Measurement precision
If multiple calculation methods are employed, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent implements dynamics by providing multiple calculation methods that can adaptively handle different waveform conditions. The system dynamically selects appropriate calculation approaches based on the characteristics of the normalized waveform, allowing high measurement precision across varying conditions while managing complexity through conditional logic rather than permanently complex architecture
Data Source
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AI summary
A biological information monitoring system (100) for monitoring the biological information of a subject (S) on a bed (BD), which comprises: one or more load detectors (11, 12, 13, 14) for detecting the load from the subject on the bed, said load detectors being provided below the bed or the bed legs; a waveform calculation unit (31) for calculating a waveform which shows temporal variation in the values detected by the load detectors depending on the subject's respirations or heartbeats; and a biological information calculation unit (32) for calculating the respiration rate or heart rate of the subject using the waveform. The biological information calculation unit comprises: a first calculation unit (321) for calculating the respiration rate or heart rate of the subject by a first means based on the waveform; a second calculation unit (322) for calculating the respiration rate or heart rate of the subject by a second means, said second means being different from the first means and comprising normalizing the waveform; and a calculation control unit (320) for, when the amplitude of the waveform is equal to or less than a threshold, then instructing the second calculation unit to execute the calculation of the respiration rate or heart rate.