Electronic Sphygmomanometer Blood Pressure Accuracy via Pulsation Derivatives
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Solution Overview
Problem
Existing electronic sphygmomanometers using oscillometry for blood pressure measurement rely on a single parameter from the envelope curve, leading to insufficiently accurate calculations of systolic and diastolic blood pressure.
Innovation Solution
A method and system that acquire a sequence of air pressure values, extract characteristic information by calculating first derivatives of air pressure pulsations, and correct blood pressure using specific equations with coefficients derived from clinical data to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only one parameter (envelope curve) is used for blood pressure calculation, then the calculation process is simple, but the measurement precision is insufficient
Solution Approach 1:
The patent segments the air pressure signal into multiple independent parameters: envelope curve, air pressure pulsations, and first derivatives of pulsations. Each parameter is extracted and processed separately, then integrated to improve measurement accuracy without overwhelming system complexity
Solution Approach 2:
The patent transitions from one-dimensional envelope curve analysis to multi-dimensional analysis by incorporating temporal derivatives and pulsation characteristics. This dimensional expansion allows capturing more physiological information from the same air pressure signal
2Measurement precision
If multiple parameters are extracted and correction steps are added, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent creates a multi-functional measurement system where the same air pressure signal serves multiple purposes: generating envelope curve, extracting pulsations, and calculating derivatives. This universal use of the base signal reduces the need for additional sensors or equipment
Solution Approach 2:
The patent replaces complex mechanical measurement systems with computational analysis. Instead of using multiple physical sensors to measure different parameters, the system uses mathematical operations (derivatives, filtering) on a single air pressure signal to extract multiple characteristics
Data Source
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AI summary
An electronic sphygmomanometer measuring method, comprising: acquiring a barometric pressure sequence (S110); obtaining a systolic pressure/diastolic pressure on the basis of the barometric pressure sequence (S120); extracting characteristic information of the barometric pressure sequence (S130); and correcting the systolic pressure/diastolic pressure on the basis of the characteristic information (S160). The measuring method increases the precision in calculating the systolic pressure/diastolic pressure. Also disclosed accordingly are an electronic sphygmomanometric system, an electronic sphygmomanometer, and a storage medium.