Blood Pressure Cuff Inflation Speed Control
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Solution Overview
Problem
Inflation blood pressure measuring apparatuses face challenges in achieving reliable measurements within a short time, especially when the subject's pulse rate is low, as the cuff's internal pressure reaches the inflation limit before sufficient pulsation information is acquired.
Innovation Solution
A blood pressure measuring apparatus that adjusts the inflation speed of the cuff based on the subject's pulse rate or past measurement data to ensure equivalent pulsation detection as with a subject having a prescribed pulse rate, thereby preventing the inflation limit pressure from being reached too quickly and allowing for more reliable and efficient measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the cuff's internal pressure is increased at a high inflation speed, then the measurement time is shortened, but the measurement reliability deteriorates when the subject's pulse rate is low
Solution Approach 1:
The patent applies dynamics by making the inflation speed adjustable rather than fixed. The controller dynamically changes the inflation speed based on the detected pulse rate, allowing the system to adapt to different subject conditions. When pulse rate is low, the inflation speed is reduced to ensure sufficient pulsation information is acquired, while maintaining relatively fast inflation for normal pulse rates to keep measurement time short.
Solution Approach 2:
The patent changes the parameter of inflation speed based on the pulse rate parameter. By detecting the pulse rate and using it to determine the appropriate inflation speed, the system optimizes the balance between measurement time and reliability. The controller selects from multiple predetermined inflation speeds (first, second, third speeds) based on the pulse rate, ensuring sufficient pulsation information acquisition while minimizing measurement time.
2Reliability
If the inflation speed is reduced to acquire sufficient pulsation information, then the measurement reliability is improved, but the measurement time increases
Solution Approach 1:
The system dynamically adjusts inflation speed based on real-time pulse rate detection. Rather than using a uniformly low inflation speed for all subjects, the controller adapts the inflation speed to each subject's pulse rate characteristics, ensuring sufficient pulsation information is acquired only when necessary while maintaining efficiency for other cases.
Solution Approach 2:
The patent implements parameter changes by selecting from multiple predetermined inflation speeds based on the detected pulse rate. The controller chooses the appropriate inflation speed parameter from a set of options, optimizing the balance between acquiring sufficient pulsation information and minimizing measurement time for each specific subject condition.
3Productivity
If a uniformly high inflation speed is used for all subjects, then the measurement time is shortened, but subjects with low pulse rate cannot provide sufficient pulsation information
Solution Approach 1:
The patent applies parameter changes by selecting from multiple predetermined inflation speeds based on the detected pulse rate. The controller adjusts the inflation speed parameter according to the subject's pulse rate characteristics, ensuring sufficient pulsation information is acquired for low pulse rate subjects while maintaining measurement efficiency for others.
Solution Approach 2:
The system uses feedback from pulse rate detection to control the inflation speed. The controller continuously monitors the pulse rate during measurement and uses this feedback information to determine the appropriate inflation speed, ensuring that sufficient pulsation information is acquired while optimizing measurement efficiency for each subject.
Data Source
AI summary
A blood pressure measuring apparatus for measuring a blood pressure of a subject using a cuff attached to the subject is equipped with an inflating mechanism—configured to increase an inner pressure of the cuff, a processor and a memory—configured to store instructions that is readable by the processor. As the instructions are executed by the processor, the blood pressure measuring apparatus-acquires a pulse rate of the subject while causing the inflating mechanism to increase the inner pressure of the cuff at a prescribed inflation speed, and compares the pulse rate as acquired to a prescribed pulse rate. The blood pressure measuring apparatus causes the inflating mechanism to increase the inner pressure of the cuff at an inflation speed that is lower than the prescribed inflation speed if the pulse rate as acquired is less than the prescribed pulse rate.