Pulse Wave Sharpness Index Using Intersecting Tangent Method
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Solution Overview
Problem
Existing methods for determining the sharpness of pulse wave signals are limited in accuracy and applicability, particularly when tidal waves occur above the ⅔ points of the percussive wave, and are not uniformly applicable to various types of pulse wave signals.
Innovation Solution
A method and apparatus that use the intersecting tangent method to determine reference lines near the peak point of a pulse wave signal, calculating a sharpness index based on the angle and height ratio formed by these lines, and applying weights to these parameters to quantify sharpness uniformly across different types of pulse wave signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing method of finding ending points based on 2/3 points of peak point is used, then the method is simple to implement, but it cannot accurately determine sharpness when tidal wave is generated at higher position than 2/3 points
Solution Approach 1:
The patent changes the reference parameter from fixed 2/3 points to dynamically determined reference lines based on curvature extrema. The first reference line starts at the first curvature extremum point and the second reference line starts at the second curvature extremum point, allowing adaptive parameter adjustment for different pulse wave shapes including those with tidal waves.
Solution Approach 2:
The patent performs preliminary determination of reference lines and their starting points before calculating the sharpness angle. By pre-establishing the first and second reference lines based on curvature analysis, the method prepares accurate reference frameworks in advance, enabling subsequent sharpness calculation to be both accurate and efficient.
2Adaptability or versatility
If the existing method is used, then the calculation process is straightforward, but it is only applicable to pulse wave signals of specific type and cannot be uniformly applied to various types
Solution Approach 1:
The patent creates a universal sharpness determination method that works for various pulse wave types by using curvature-based reference lines instead of fixed 2/3 point references. The method can handle different pulse wave shapes including those with tidal waves at various positions, making it multi-functional and broadly applicable while maintaining accuracy through adaptive reference line determination.
3Measurement precision
If reference lines are determined using curvature-based intersecting tangent method, then accurate sharpness index can be obtained for various pulse wave types, but the determination process becomes more complex
Solution Approach 1:
The patent performs preliminary determination of reference lines and their starting points based on curvature extrema before calculating the sharpness angle. By pre-establishing the first and second reference lines and identifying their intersection points with the horizontal line through the peak point, the method prepares accurate reference frameworks in advance, enabling subsequent sharpness calculation to be both accurate and efficient.
Data Source
AI summary
A method for determining a sharpness index of a pulse wave signal includes receiving a pulse wave signal; determining a first reference line starting point and a second reference line starting point on the basis of a curvature of the pulse wave signal; determining a first reference line connecting the first reference line starting point and a first reference line ending point by determining the first reference line ending point by applying an intersecting tangent method to the first reference line starting point, and determining a second reference line connecting the second reference line starting point and a second reference line ending point by determining the second reference line ending point by applying the intersecting tangent method to the second reference line starting point; and determining a sharpness index by using a peak point of the pulse wave signal, the first reference line, and the second reference line.