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## Description
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* Automated Ambubag device controlled by a pi 4 and actuated by two NEMA 17 stepper motors
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* Automated Ambubag device controlled by a Pi 4 and actuated by two NEMA 17 stepper motors
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* Touch screen interface (english, espanol, italiano)
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* Variable tidal volume and respiratory rate control
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* Structure is entirely 3D printed
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## Assembly
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### 3D Printed Part Files
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[LCAEV-0.1-parts.zip](uploads/5fba291c5bb63026536299bb34f95456/LCAEV-0.1-parts.zip)
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* https://www.amazon.com/gp/product/B07K8DFY3Q
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* 1x Adafruit Pi Stepper Hat
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* https://www.amazon.com/Adafruit-Stepper-Motor-HAT-Raspberry/dp/B00TIY5JM8/
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1x BMP 180 (optional)
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* 1x BMP 180 (optional)
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* https://www.amazon.com/LICTOP-Precision-Barometric-Pressure-Temperature/dp/B07NMXD3J9/
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* 1x Ambubag
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* (expected to be provided by healthcare facility)
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* Power supplies (USB wall warts, etc.)
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* TBD
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* 1x 5v 2a+, dual USB output wall wart
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* https://www.amazon.com/gp/product/B07437M5QQ/
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* 1x 5v 4a wall wart
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* https://www.amazon.com/gp/product/B01N4HYWAM
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* zip ties
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* m3 screws
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* glue
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* blue loctite
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### Build Instructions
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1. Order parts
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1. Print components
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* 2x: LCAEV_spur_gear (print at 100% infill PLA, 3 walls)
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* 2x: LCAEV_spur_gear (print at 100% infill PETG, 3 walls)
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* 2x: LCAEV_piston (print at 25% infill PLA, 3 walls)
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* 2x: LCAEV_base_half (print at 25% infill PLA, 3 walls)
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* 1x: LCAEV_bag_connector (print at 25% infill PLA, 3 walls)
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* git clone git@gitlab.com:PerAsperaAdAstra/lcaev.git
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* run the setup/install.py file and follow its instructions
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* cd lcaev/setup
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* python3 install.py
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* sudo python3 install.py
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* restart the pi to verify the GUI comes up as expected
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1. Gently hammer the spur gears onto the stepper motor spindles
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1. Glue the base tabs and mate
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1. Align and mate the bases (glue optional)
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1. Align the base connector with the half-ring cutouts and attach with zip ties
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1. Align the bag connector on the opposite side's half-ring cutouts and attach with zip ties
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1. Install the stepper motors (blue loctite and m3 screws)
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1. Connect power leads and stepper leads to HAT
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1. Connect stepper power/data cables from stepper to HAT leads
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1. Set the ambubag into the assembly and zip tie its outlet to the bag connector arms
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1. (optional) insert BMP180 barometer into housing and tack with glue. Fill in holes around pins with glue (don't put so much that you can't connect to the pins!). Attach sensor wires to pi GPIO and sensor.
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1. Connect to power, boot, and verify function
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1. set up LCAEV near patient
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1. zip tie ambubag into system
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2. connect LCAEV to power source (should automatically boot)
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2. connect both LCAEV wall warts to power (LCAEV then should automatically boot)
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3. wait for GUI to come up
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4. connect ambubag to patient circuit
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* DO NOT CONNECT THE CIRCUIT TO THE PATIENT
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* NOTE: patient circuit must contain valving near the mouth to minimize dead volume in the circuit
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4. connect viral filter to exhalation side of the circuit (provided by the user)
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1. connect PEEP valve after viral filter (provided by the user)
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* DO NOT CONNECT THE SYSTEM TO THE PATIENT
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* DO NOT CONNECT THE CIRCUIT TO THE PATIENT
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1. Follow the GUI prompts to begin ventilation
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* calibrate barometer
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* verify system working during self-test
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* set respiratory rate, tidal volume, start ventilation
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* update as needed, enable/disable assist control, mute alarm
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# Research
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