Respiration Waveform Drawing System Using Center of Gravity Projection
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Solution Overview
Problem
Existing respiratory waveform drawing systems fail to provide real-time monitoring of a subject's respiratory condition, as they cannot accurately depict respiratory movements based on the center of gravity variations.
Innovation Solution
A respiratory waveform drawing system that sets oscillation coordinates by determining extreme points and projecting the center of gravity's position onto a tentative oscillation axis, with a compensation unit to correct for deviations and ensure continuous waveform display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load sensors are arranged under bed legs to measure respiratory condition based on load sensor values, then respiratory condition can be measured, 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 from current load sensor readings, eliminating processing delays and achieving real-time presentation.
Solution Approach 2:
The patent replaces traditional mechanical respiratory measurement devices (such as chest belts or airflow sensors) with a load sensor-based system that infers respiratory movements from center of gravity variations. This substitution enables non-contact, real-time measurement without the inertia and complexity of mechanical sensing systems.
2Measurement precision
If load detectors are arranged under bed legs to obtain center of gravity movement, then respiratory movement can be obtained, but accurate real-time waveform drawing is not achieved
Solution Approach 1:
The system dynamically adjusts the parameters used for waveform generation based on the detected center of gravity movement patterns. By changing the reference frame and coordinate system according to the subject's position and movement characteristics, the system maintains high waveform drawing accuracy despite variations in measurement conditions.
Solution Approach 2:
The system continuously monitors the detected respiratory movements and compares them with expected physiological patterns. This feedback mechanism allows real-time correction of waveform drawing parameters, ensuring accuracy even when measurement conditions change, such as when the subject shifts position on the bed.
3Ease of operation
If center of gravity position is used to draw respiratory waveform, then respiratory condition can be monitored, but coordinate system alignment is not established
Solution Approach 1:
The system pre-establishes the coordinate transformation relationships between the load sensor reference frame and the physiological waveform reference frame. By calculating and storing the transformation matrices in advance, the system ensures accurate coordinate alignment when drawing respiratory waveforms without requiring real-time complex calculations.
Solution Approach 2:
The patent introduces a coordinate transformation intermediary that converts center of gravity position data into the appropriate waveform coordinate system. This intermediary layer handles the complexity of coordinate alignment, allowing the main monitoring function to operate simply while maintaining high measurement precision through accurate coordinate conversion.
Data Source
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AI summary
A respiratory waveform drawing system (100) for drawing respiratory waveforms of subjects (S) 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 each of which is configured to detect loads of the subjects and output the detected loads of the subjects as a load signal; a subject number determination unit (3) configured to determine a number of the subjects on the bed based on a frequency spectrum of the load signal; a waveform separation unit (33) configured to separate a load component of each of the subjects from the load signal outputted from each of the plurality of load detectors, in a case that the number of the subjects on the bed is determined to be more than one; a center of gravity position calculation unit (31) configured to calculate a position of a center of gravity of each of the subjects based on the separated load component of each of the subjects; and a waveform drawing unit (35) configured to draw a respiratory waveform of each of the subjects based on a temporal variation of the position of the center of gravity of each of the subjects.