Respiration Waveform Drawing Using Center of Gravity Oscillation
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Solution Overview
Problem
Existing respiratory waveform drawing systems fail to provide real-time representations of a subject's respiratory condition, which is essential for monitoring and managing conditions like sleep apnea syndrome.
Innovation Solution
A respiratory waveform drawing system that uses load detectors under a bed to calculate the center of gravity's position and projects this onto a tentative oscillation axis to draw the respiratory waveform, with adaptive adjustments to ensure accurate and continuous representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load sensors are arranged under legs of a bed to measure respiratory condition, then respiratory condition can be measured, but real-time waveform presentation is not achieved
Solution Approach 1:
The system performs preliminary actions by pre-calculating and storing extreme points (maximum and minimum positions) of the center of gravity during the respiratory cycle. These pre-identified extreme points are used to establish the oscillation axis and origin, enabling real-time waveform presentation without computational delay during actual measurement.
Solution Approach 2:
The patent segments the respiratory cycle into distinct phases by identifying extreme points (maximum and minimum positions) of the center of gravity. This segmentation allows the system to process and present waveform data in discrete, manageable units corresponding to individual respiratory cycles, improving real-time presentation capability.
2Measurement precision
If load detectors are used to obtain center of gravity movement, then respiratory movement can be obtained, but the waveform representation is not real-time
Solution Approach 1:
The system performs preliminary identification of extreme points and establishes the oscillation coordinate system before actual waveform generation. This preliminary setup eliminates complex real-time coordinate transformations, allowing rapid waveform presentation that meets real-time requirements.
Solution Approach 2:
The patent dynamically adjusts the waveform presentation by continuously updating the center of gravity position relative to the pre-established oscillation axis and origin. This dynamic approach allows the system to adapt to varying respiratory patterns while maintaining real-time performance through efficient coordinate calculations.
3Measurement precision
If the center of gravity position is used to draw respiratory waveform, then respiratory condition can be visualized, but coordinate system alignment may be inaccurate
Solution Approach 1:
The system performs preliminary identification of extreme points (maximum and minimum positions) of the center of gravity during the respiratory cycle. These pre-identified extreme points are used to establish the oscillation axis and origin, enabling accurate coordinate system alignment before waveform generation begins.
Solution Approach 2:
The patent employs feedback mechanisms by continuously monitoring the center of gravity position and comparing it against the established oscillation axis and origin. This feedback allows for real-time verification and adjustment of coordinate alignment, ensuring accurate waveform representation throughout the measurement process.
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 includes: a plurality of load detectors (11, 12, 13, 14) which are to be placed in the bed (BD) 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 obtain a position of a center of gravity (G) of the subject based on the load of the subject; an oscillation coordinate setting unit (34) configured to perform: obtaining a first extreme point (EP1) at which a distance between an initial origin (TO1) and the position of the center of gravity of the subject shifting from the initial origin is maximized, the position of the center of gravity of the subject at a certain time point being used as the initial origin: obtaining a second extreme point (EP2) which appears at an opposite side of the initial origin from the first extreme point, and at which a distance between the initial origin and the position of the center of gravity of the subject shifting from the first extreme point is maximized: setting a direction connecting the first and second extreme points as a direction of a tentative oscillation axis (TA2): and setting a midpoint between the first and second extreme points as a tentative oscillation origin (T02); and a waveform drawing unit (35) configured to draw the respiratory waveform by presenting a displacement (D), from the tentative oscillation origin, of a position obtained by projecting the position of the center of gravity of the subject onto the tentative oscillation axis, with respect to time.