Circulatory Function Calculation Using Multivariate Pulse Wave Analysis
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Solution Overview
Problem
Current circulatory organ function calculation devices are influenced by hardware characteristics, living body characteristics, and measurement environment, leading to deviations in calculation accuracy, and only consider the upper base of the pulse wave amplitude pattern, neglecting other relevant characteristics that reflect circulatory organ functions.
Innovation Solution
The device incorporates a characteristic quantity calculation unit that utilizes cumulative addition ratios, gradients, and integral values of characteristic curves to evaluate vascular conditions, employing multivariate analysis such as principal component analysis, discriminant analysis, and differential values to improve calculation accuracy and distinguish specific circulatory organ diseases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the upper base of pulse wave amplitude pattern is used for calculation, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The patent transitions from using only a single parameter (upper base of pulse wave amplitude) to utilizing multiple parameters including gradient values, integral values, and various characteristic quantities of the pulse wave. This multi-dimensional approach to data utilization improves measurement precision while maintaining manageable calculation complexity through systematic processing methods
2Ease of operation
If hardware characteristics and living body characteristics are not compensated, then the device operation is simplified, but the measurement precision deteriorates due to deviations from actual conditions
Solution Approach 1:
The patent applies parameter changes by introducing correction coefficients that account for hardware characteristics and living body characteristics. These coefficients modify the calculation parameters to compensate for systematic deviations, thereby improving measurement precision without significantly complicating the operational procedure
Solution Approach 2:
The patent implements feedback mechanisms by using detected pulse wave information to calculate correction coefficients that are then applied to subsequent measurements. This feedback loop continuously improves accuracy by adapting to actual measurement conditions and reducing deviations from true physiological states
Data Source
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AI summary
A circulatory organ function arithmetic calculation device (1) having a compression section (10), a pressure detection unit (30), a pressure control unit (20), a pulse wave detection unit (40), and a characteristics value arithmetic calculation unit (50). The compression section (10) compresses a section to be measured, on the measurement subject. The pressure detection unit (30) detects the compression pressure generated by the compression section (10). The pulse wave detection unit (40) detects a plurality of pulse waves (W) on the basis of output signals from the pressure detection unit (30) during a compression pressure variation process caused by the pressure control unit (20). The characteristics value arithmetic calculation unit (50) generates converted information by at least combining the pulse wave information for the plurality of pulse waves (W), generates a plurality of variable values from the converted information, enters the plurality of variable values into an arithmetic formula having a plurality of variables and coefficients found by prior multivariate analysis, and calculates the characteristics values for the circulatory organ function.