Respiratory Waveform Drawing System Using Predictive Compensation
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Solution Overview
Problem
Existing respiratory waveform drawing systems in medical treatment settings fail to provide real-time representations of a subject's respiratory condition, as previous methods cannot accurately compensate for disturbances and movements, leading to discontinuities in the waveform.
Innovation Solution
A respiratory waveform drawing system and method that utilize load detectors under a bed to calculate the center of gravity's position, generate predictive waveforms, and adjust the drawing state by calculating distances between actual and predictive waveforms, ensuring almost real-time representation of respiratory movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load detectors are arranged under legs of a bed to measure respiratory condition, then respiratory condition can be grasped, but real-time waveform presentation is not achieved
Solution Approach 1:
The system pre-calculates and stores the relationship between center of gravity position and respiratory waveform characteristics. When measurement is needed, the pre-established model allows immediate waveform generation without real-time complex calculation, thus achieving real-time presentation while maintaining measurement precision.
Solution Approach 2:
The system creates a simplified copy or model of the respiratory waveform based on center of gravity position data. Instead of directly processing complex raw sensor data in real-time, it generates a representative waveform model that captures essential respiratory characteristics, enabling real-time visualization.
2Measurement precision
If load detectors are used to detect center of gravity movement, then respiratory movement can be obtained, but waveform continuity is disrupted by body movements
Solution Approach 1:
The system continuously monitors the relationship between center of gravity position and respiratory waveform, and dynamically adjusts the waveform generation parameters based on feedback from ongoing measurements. This feedback mechanism allows the system to distinguish between respiratory-induced center of gravity changes and movement-induced changes, maintaining waveform continuity even during body movements.
Solution Approach 2:
The system employs dynamic thresholding and adaptive filtering that adjust in real-time based on the detected motion patterns. When body movements are detected, the system dynamically modifies its processing parameters to filter out movement artifacts while preserving respiratory signal integrity, thus maintaining waveform continuity.
3Device complexity
If simple load detection is used, then device complexity is reduced, but waveform accuracy and real-time performance deteriorate
Solution Approach 1:
The system replaces complex mechanical respiratory monitoring devices with a simpler load detection system. By using computational algorithms to process the load detector data, the system achieves waveform accuracy comparable to complex mechanical systems while maintaining the simplicity and ease of installation of the load detector-based approach.
Data Source
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AI summary
A respiratory waveform drawing system (100) for drawing a respiratory waveform of a subject on a bed (BD) includes; a plurality of load detectors (11, 12, 13, 14) which are to be placed in the bed or under legs of the bed, and which are configured to detect a load of the subject; a center of gravity position calculation unit (31) configured to calculate a position of a center of gravity of the subject based on the load of the subject; a waveform drawing unit (35) configured to draw the respiratory waveform of the subject based on a temporal variation of the position of the center of gravity of the subject; and a drawing compensation unit (36) configured to compensate a drawing state of the respiratory waveform. The drawing compensation unit includes: a predictive waveform generation unit (361) configured to generate a predictive waveform for the respiratory waveform of the subject based on the temporal variation of the position of the center of gravity of the subject in a past; and a correction distance calculation unit (362) configured to calculate a distance between the respiratory waveform and the predictive waveform at a predetermined sampling time point. The drawing compensation unit is configured to compensate the drawing state of the respiratory waveform depending on the distance.