MEMS Pump Blood Pressure Cuff Inflation Control
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Solution Overview
Problem
Existing blood pressure measurement devices with MEMS pumps face challenges in achieving accurate and stable inflation, leading to difficulties in maintaining a consistent pressurization speed and airflow.
Innovation Solution
A blood pressure measurement device with a MEMS pump, controlled by a microcontroller that adjusts the drive voltage level of the MEMS pump to maintain a stable inflation speed within a predetermined range, typically between 4 to 6 mmHg/sec.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the drive voltage or drive frequency of the MEMS pump is controlled via a microcontroller to maintain slow and steady rise of pressure, then the inflation speed stability is improved, but the device complexity increases due to requiring a complicated control circuit
Solution Approach 1:
The patent implements a feedback control mechanism where the microcontroller continuously monitors the inflation pressure and adjusts the MEMS pump drive voltage accordingly. The pressure sensor provides real-time feedback to the microcontroller, which then modulates the pump operation to maintain the desired inflation speed, resolving the contradiction by achieving stability through intelligent control rather than circuit complexity
Solution Approach 2:
The patent replaces complex mechanical control circuits with a microcontroller-based electronic control system. The microcontroller uses software algorithms to manage the inflation process, substituting what would traditionally require complicated analog control circuits with a more flexible and programmable digital control approach
2Measurement precision
If the MEMS pump is used to inflate the bladder during the inflation process for blood pressure measurement, then the measurement precision is improved by capturing pulse pressure, but the inflation speed control becomes difficult to achieve stable results
Solution Approach 1:
The patent employs dynamic control of the MEMS pump operation during inflation. The microcontroller adjusts the pump drive voltage in real-time based on the current inflation pressure and desired inflation speed, allowing the system to adapt to changing conditions and maintain reliable inflation speed control while achieving precise blood pressure measurement
Solution Approach 2:
The patent changes the drive voltage parameter of the MEMS pump dynamically during the inflation process. By adjusting the voltage level based on real-time pressure feedback, the system maintains optimal inflation speed for capturing pulse pressure signals while ensuring measurement precision
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
The solution ensures a stable and accurate inflation process, allowing for precise measurement of blood pressure values by maintaining a consistent inflation speed and airflow.
Implementation Method 1
MEMS pump made of piezoelectric material with anti-piezoelectric effect has the features of low noise, high control precision, and stable output
Data Source
AI summary
This invention discloses a blood pressure measurement device including a cuff having a bladder wrap around an object to be measured, a MEMS pump for inflating the bladder with air, a pressure sensor for monitoring the pressure in the bladder, and a microcontroller for controlling the pressure sensor to continuously receive pressure signals during the process of inflating the bladder, converting the pressure signals into blood pressure values, and controlling a drive voltage level of the MEMS pump to maintain an air inflation speed of the MEMS pump in a predetermined inflation speed range. The invention further discloses a method for controlling a fixed frequency change of the blood pressure measurement device.