Respiration-Induced Blood Pressure Fluctuation Measurement Using Cuff Pulse Wave Analysis
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Solution Overview
Problem
Existing methods for measuring respiration-induced blood pressure fluctuations, such as those used in diagnosing asthma and COPD, face challenges including the need for skilled professionals, low accuracy, and high costs due to complex sensor structures and calibration requirements.
Innovation Solution
A measuring apparatus and method that calculates pressure equivalent respiration-induced blood pressure fluctuations without prior calibration or costly configurations, using a cuff pressure pulse wave and pulse pressure to determine the fluctuations as a pressure value, allowing for accurate and practical measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tonometry method or volume compensation method is used to measure respiration-induced blood pressure fluctuations, then measurement accuracy is improved, but device complexity and cost increase due to complicated sensor structures and pressure control requirements
Solution Approach 1:
The patent extracts only the necessary components for measurement from the complex tonometry and volume compensation systems. It uses a simple pressure sensor to detect cuff pressure fluctuations and a pulse wave sensor to detect pulse waves, eliminating the need for complicated sensor structures and pressure control mechanisms while maintaining measurement accuracy.
Solution Approach 2:
The patent creates a simplified measurement model that copies the essential measurement function of complex methods. By using a simple cuff-based oscillometric method combined with pulse wave detection, it replicates the core measurement capability of tonometry and volume compensation without requiring their complex implementations.
2Device complexity
If the Korotkoff sound method is used to measure respiration-induced blood pressure fluctuations, then device complexity is reduced, but measurement accuracy decreases and skilled operation is required
Solution Approach 1:
The patent replaces the manual auscultatory method (mechanical listening to Korotkoff sounds) with electronic detection. It uses a pressure sensor to automatically detect cuff pressure fluctuations and a pulse wave sensor to detect pulse waves, eliminating the need for skilled manual operation while improving measurement accuracy.
Solution Approach 2:
The patent incorporates feedback mechanisms where the detected pulse wave information is used to identify systolic and diastolic pressure points automatically. The system continuously monitors cuff pressure fluctuations in sync with pulse wave detection, providing real-time feedback to calculate respiration-induced blood pressure fluctuations with high accuracy.
3Device complexity
If the peripheral volume pulse wave method is used to measure respiration-induced fluctuations, then device complexity is reduced, but the ability to provide pressure equivalent measurement values for diagnostic decision-making decreases
Solution Approach 1:
The patent merges two measurement approaches: the oscillometric cuff pressure method (which provides pressure equivalent values) and the pulse wave detection method. By combining these methods, it retains the pressure equivalent measurement capability necessary for diagnostic decision-making while using the simpler pulse wave sensor for detection.
Solution Approach 2:
The patent uses asymmetric measurement strategies where cuff pressure is measured continuously to provide pressure equivalent values, while pulse wave detection is used specifically to identify key pressure points (systolic and diastolic). This asymmetric approach ensures pressure information is preserved for diagnostics while simplifying the overall measurement system.
Data Source
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AI summary
An apparatus and a method for measuring a respiration-induced blood pressure fluctuation are provided. A blood pressure calculating section calculates a pulse pressure of a subject. A pulse wave measuring section measures a pulse wave of the subject. A respiration-induced fluctuation calculating section calculates the respiration-induced blood pressure fluctuation of the subject as a pressure value, based on the pulse pressure and a fluctuation and an amplitude of the pulse wave in a given time period.