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A medical device to cyclically build and release pressure in a cuff

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A device to apply and release pressure in a cuff wrapped around a limb, to ease pain.

How existing digital blood pressure monitors work

Motor pump increases pressure in cuff

When pressure = blood pressure, blood flow stops => detected by microphone / stethoscope => used to know at what pressure to take systolic/diastolic reading. This is not needed for our device

Has a separate sensor to continuously measure pressure, connected with a T junction between the pump and the cuff.

Our Device

Only increases and decreases pressure cyclically

There are leaks etc, so motor needs to keep running to maintain pressure Possibly use PID control

Parts

HX710B pressure sensor

comes with a port for 2.5mm hose

https://robu.in/product/hx710b-air-pressure-0-40kpa-sensor-module/

https://www.electroschematics.com/pressure-sensor-guide/ - uses: https://github.com/bogde/HX711

https://forum.arduino.cc/t/using-hx710b-pressure-sensor/648374/3

Mitsumi R-14 A212: air pump

Currently unavailable :(

Can harvest existing BP devices for the pump

XL6009 boost converter

To convert 5 V from motor shield to 12 V for solenoid valve.

https://amzn.in/d/8wb3pvw

Tutorial: https://youtu.be/ehxq8R4muGI

Explanation: https://www.monolithicpower.com/en/learning/mpscholar/power-electronics/dc-dc-converters/buck-boost-converters

3 way Solenoid valve

(?Purchase Link)

Needs 12V power

https://www.fluidcontrols.co.uk/how-solenoid-valves-work/

https://www.iqsdirectory.com/articles/solenoid-valve/3-way-solenoid-valves.html

Screen

https://robu.in/product-category/microcontroller-development-board/arduino-boards/display-for-arduino/

https://youtu.be/4DtuOeeYHys

https://learn.adafruit.com/adafruit-2-8-and-3-2-color-tft-touchscreen-breakout-v2

https://randomnerdtutorials.com/guide-to-1-8-tft-display-with-arduino/

https://en.wikipedia.org/wiki/TFT_LCD: enlightening


  • Use processing, later use a display, and possibly a UI library either physics buttons or touchscreen

  • Pressure relief valve with a solenoid Also one for user in emergency

  • Powered by wall wart + rechargeable battery (newer arduino’s come with battery management system?)

  • User interface: On, off, change program Program has ramp up time, max pressure steady time, ramp down time, no of cycles

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A medical device to cyclically build and release pressure in a cuff

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