Blood Pressure Cuff Attachment Detection via Pulsation Signal Analysis
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Solution Overview
Problem
Existing blood pressure measuring apparatuses face challenges in accurately determining blood pressures when the cuff is deviated or loose, as periodical noise from improper attachment can be mistaken for intrinsic pulsation signals, leading to incorrect amplitude detection and subsequent blood pressure measurement.
Innovation Solution
A blood pressure measuring apparatus that uses a processor to acquire pulsation information and its differential values to detect an inappropriate cuff attachment state by analyzing local minimal and maximal values, variations, and relationships between them, allowing for the differentiation between noise and pressure variations due to artery beating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cuff is attached to the subject during inflation, then blood pressure can be measured, but periodical noise is superimposed on the pulsation signal when the cuff position deviates or becomes loose, making it hard to discriminate from the intrinsic pulsation signal
Solution Approach 1:
The system performs preliminary detection of cuff attachment state by analyzing the relationship between cuff pressure and pulsation signal amplitude before final blood pressure measurement. The processor detects whether the cuff is properly attached by examining if the pulsation signal amplitude increases appropriately with cuff pressure, and if not, prompts the user to readjust the cuff before proceeding with measurement.
Solution Approach 2:
The system provides feedback to the user about cuff attachment status during the measurement process. When periodical noise is detected or when the pulsation signal characteristics indicate improper attachment, the processor notifies the user to check and readjust the cuff position, allowing correction before final measurement.
2Measurement precision
If the cuff pressure is increased to measure blood pressure, then the pulsation signal can be detected, but the periodical noise from improper attachment becomes more prominent and harder to distinguish
Solution Approach 1:
The system performs preliminary detection of cuff attachment state by analyzing the relationship between cuff pressure and pulsation signal amplitude before final blood pressure measurement. The processor detects whether the cuff is properly attached by examining if the pulsation signal amplitude increases appropriately with cuff pressure, and if not, prompts the user to readjust the cuff before proceeding with measurement.
Solution Approach 2:
The system provides feedback to the user about cuff attachment status during the measurement process. When periodical noise is detected or when the pulsation signal characteristics indicate improper attachment, the processor notifies the user to check and readjust the cuff position, allowing correction before final measurement.
3Productivity
If the pulsation signal amplitude is used to determine blood pressure, then blood pressure can be calculated, but incorrect amplitude detection due to noise leads to incorrect blood pressure determination
Solution Approach 1:
The system performs preliminary detection of cuff attachment state by analyzing the relationship between cuff pressure and pulsation signal amplitude before final blood pressure measurement. The processor detects whether the cuff is properly attached by examining if the pulsation signal amplitude increases appropriately with cuff pressure, and if not, prompts the user to readjust the cuff before proceeding with measurement.
Solution Approach 2:
The system provides feedback to the user about cuff attachment status during the measurement process. When periodical noise is detected or when the pulsation signal characteristics indicate improper attachment, the processor notifies the user to check and readjust the cuff position, allowing correction before final measurement.
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
Enables accurate detection of inappropriate cuff attachment states, preventing incorrect blood pressure measurements by distinguishing between noise and pressure variations, thus ensuring reliable blood pressure determination.
Implementation Method 1
The amplitude of the pulsation signal corresponds to the magnitude of vibration that is caused by beating of an artery being pressed by the cuff
Data Source
AI summary
A blood pressure measuring apparatus for measuring blood pressure of a subject using a cuff attached to the subject includes a processor and a memory to store instructions that are readable by the processor. As the instructions are executed by the processor, the apparatus generates a pulsation signal of the subject while increasing an inner pressure of the cuff; generates a first-order differential signal by differentiating the pulsation signal. The apparatus then detects an inappropriate attachment state of the cuff based on at least one of: a bottom value of the first-order differential signal; a relationship between a peak value and the bottom value of the first-order differential signal; an amplitude amount of the first-order differential signal including the bottom value in a unit time; and a relationship between the amplitude amount and an amplitude amount of the first-order differential signal including the peak value in a unit time.