Back Body Surface Pulse Wave Blood Pressure Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biological state estimation methods fail to accurately detect blood pressure fluctuations and associated physiological phenomena, such as the desire to void, using biosignals collected from the trunk, which limits their ability to assess urinary urgency and other related states.
Innovation Solution
A biological state estimation device and method that processes back sound and vibration information to analyze pseudo heart sound waveforms, comparing amplitudes and patterns to estimate blood pressure fluctuations and physiological phenomena like urinary urgency, by plotting waveform components in a coordinate system and classifying patterns to determine the presence of a desire to void.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing biological state estimation methods are used to analyze biosignals from the trunk, then general biological state information can be obtained, but accurate detection of blood pressure fluctuations and urinary urgency is not achieved
Solution Approach 1:
The patent extracts and isolates the pseudo heart sound waveform component from the complex back sound and vibration information. By specifically targeting and separating this waveform component that correlates with blood pressure fluctuations, the system extracts the critical information needed for accurate detection of blood pressure changes and urinary urgency, resolving the information loss problem.
Solution Approach 2:
The patent transforms the analysis approach by changing from general biosignal analysis to specific waveform parameter analysis. It identifies and analyzes specific parameters of the pseudo heart sound waveform (amplitude, duration, interval) that directly correlate with blood pressure fluctuations, enabling precise measurement of previously undetectable physiological states.
2Measurement precision
If back sound and vibration information is processed to extract pseudo heart sound waveform, then blood pressure fluctuation detection is enabled, but measurement precision requires sophisticated signal processing
Solution Approach 1:
The patent segments the complex back sound and vibration information into distinct components, specifically isolating the pseudo heart sound waveform. By dividing the signal processing task into segmentation (separating pseudo heart sound from other sounds), feature extraction (identifying waveform characteristics), and analysis (comparing amplitude and interval changes), the system achieves precise blood pressure detection while managing complexity through structured processing stages.
Solution Approach 2:
The pseudo heart sound waveform acts as an intermediary between the raw back sound information and the blood pressure measurement. This intermediate representation captures the essential blood pressure-related information in a processed form that is easier to analyze, serving as a bridge that simplifies the measurement process while maintaining accuracy.
3Adaptability or versatility
If pseudo heart sound waveform analysis is performed by comparing waveform components, then urinary urgency detection is achieved, but the method requires specific waveform identification and pattern recognition
Solution Approach 1:
The patent performs preliminary identification and characterization of the pseudo heart sound waveform before using it for physiological state detection. By pre-establishing the waveform's characteristics (amplitude, duration, interval patterns) and its correlation with blood pressure changes, the system prepares the data structure and recognition patterns needed for subsequent detection of urinary urgency and other states, reducing the complexity of real-time analysis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively detects blood pressure fluctuations and associated physiological phenomena, enabling accurate estimation of urinary urgency and other states related to blood pressure changes, using a pseudo heart sound waveform analysis that correlates with phonocardiographic measurements.
Implementation Method 1
Sound and vibration information arising from cardiac and aortic motions, which is detected from the back of the upper body of a person, is pressure vibration arising from the cardiac and aortic motions
Implementation Method 2
the biological state estimation means is set to estimate the biological state by using a pseudo heart sound waveform corresponding to a period of heart sound and comparing predetermined waveform components in the pseudo heart sound waveform
Implementation Method 3
plotting waveform components in a coordinate system and classifying patterns to determine the presence of a desire to void
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The present invention uses a time-series waveform of biosignal information collected from the back of a person and including biological sound and vibration (back body surface pulse wave). The back body surface pulse wave is pressure vibration arising from cardiac and aortic motions, and includes ventricular systolic and diastolic information and information on vascular wall elasticity which serves as an auxiliary pump for the circulation, and is considered as a vibration system including both the damping of viscous damping friction and the damping of solid friction. The back body surface pulse wave fluctuates according to a flow rate (stroke volume) of blood pumped out from the heart, and the fluctuation of this flow rate is reflected in the amplitude of the time-series waveform of the back body surface pulse wave. Therefore, by applying a solution which calculates a damping ratio of a free damped vibration waveform to compare predetermined waveform components in one cardiac cycle, preferably, amplitudes of two waveform components in an amplification phase, it is possible to detect a biological state, in particular, a biological state associated with a blood pressure.