Blood Pressure Cuff Control for Consistent Wrapping
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Solution Overview
Problem
Conventional blood pressure measurement devices experience variations in cuff wrapping strength due to inconsistent air inflation, leading to fluctuations in measured blood pressure values.
Innovation Solution
A blood pressure measurement device with a control unit that maintains a compression air bladder pressure higher than or equal to atmospheric pressure during deflation, ensuring consistent cuff wrapping strength by controlling the internal pressure difference between the measurement and compression air bladders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the measurement air bladder is preliminarily inflated based on time period of driving an inflation mechanism, then the wrapping process is completed, but variations in air evacuation cause variations in wrapping strength
Solution Approach 1:
The system uses pressure detection means to detect the internal pressure of the measurement air bladder in real-time, and the control means adjusts the inflation/deflation process based on this feedback to achieve consistent wrapping strength regardless of air evacuation variations
Solution Approach 2:
The invention changes the control parameter from time-based inflation control to pressure-based control, where the inflation and deflation processes are controlled based on detected internal pressure values to ensure consistent wrapping strength
2Reliability
If the amount of air in the measurement air bladder varies, then the wrapping strength varies, but maintaining consistent wrapping strength requires precise pressure control
Solution Approach 1:
The pressure detection means continuously monitors the internal pressure of the measurement air bladder and provides feedback to the control means, which automatically adjusts the inflation/deflation to maintain consistent wrapping strength
Solution Approach 2:
The system uses its own pressure detection capability to automatically regulate and maintain consistent wrapping strength without requiring external intervention or complex manual adjustment mechanisms
3Quantity of substance
If air evacuation from the measurement air bladder is incomplete, then the amount of air left varies, but complete evacuation may cause over-compression
Solution Approach 1:
The pressure detection means monitors the internal pressure during deflation, and the control means stops the deflation process when the pressure reaches a predetermined value, preventing both incomplete evacuation and over-compression
Solution Approach 2:
The system preliminarily sets a predetermined pressure value as the target for deflation, and the control means guides the deflation process to reach this target, ensuring complete evacuation without over-compression
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
This approach stabilizes the cuff wrapping strength, reducing variations in measured blood pressure values and facilitating reliable air evacuation from the measurement air bladder.
Implementation Method 1
Blood pressure is measured based on changes in the pressure of the measurement air bladder. Pressure pulse waves (changes in the internal pressure of the measurement air bladder) with amplitudes corresponding to thresholds
Implementation Method 2
the control unit causes the compression air bladder to apply a pressure that is higher than or equal to the atmospheric pressure to the measurement air bladder by controlling an internal pressure of the compression air bladder
Data Source
AI summary
A blood pressure measurement device includes a measurement air bladder for being wrapped around a body part to be measured, a compression member that compresses the measurement air bladder from the outside of the measurement air bladder against the body part to be measured; an inflation member for inflating the measurement air bladder, a deflation member for deflating the measurement air bladder, a blood pressure determination unit that determines a blood pressure during the inflation by the inflation member or during the deflation by the deflation member, and a control unit that causes the compression member to apply a pressure that is higher than or equal to an atmospheric pressure to the measurement air bladder when an internal pressure of the measurement air bladder reaches or falls below a certain pressure due to the deflation by the deflation member.