Ventilator Design

splitvent - Designs and Tools to help multiply available Ventilators

This project includes designs for 3D-printed ventilator “Y” splitters, 3D printed flow restrictors, and Raspberry Pi software to monitor per-patient respiratory flow with a Sensirion SFM-3x00 series inline flow sensor

We are releasing our work early and often, and in a form that we hope interested individuals can reproduce.

Contributors to this project submit their work under a Creative Commons ShareAlike 4.0 license. See LICENSE.md for more details

News

• 2020-03-29 7:30PM EST - Raspberry pi image now available for download

Video Updates

• SplitVent Daily Update March 30 - Showcase improvements to the UI, a 3D printed cap to the flow sensor, revisions to valves including larger handles that make it easier to operate.

• SplitVent System Description March 29 - Demonstrate how restricter valves and flow monitoring can allow quality vantilation to multiple patients with one ventilator.

Quick Start

3D Printing Models

• Models have been printed with FDM printers using PLA or PETG.

• TPU can be used for an o-ring.

• Other materials such as Med610, Dental SG/LT, and Teeth A2 can be used and should be considered for sterilization purposes.

• Models printed with FDM should use 10-20% infill with supports touching buildplate.

Monitoring Software

• Fabricate a cable to connect to the sensor’s connector surface contact lands.

• Connect your RPi to the Sensirion sensor as shown in the image below:

• Download the RPi disk image, unzip, and write to an 8GB or greater SD card. Follow the instructions here

• Install the SD card into the RPi

• Plug in an HDMI monitor

• Power on the RPi

• Hit ctrl-c a few times to stop the console app

• run “git pull” to get latest GUI changes

• logout

You’ll see a UI like this:

Thanks to the following contributors:

• Tobin Greensweig
• Nate Surls
• Paul Holland
• Timothy Nisi
• Paul Yearling
• Brian Overshiner
• Joe Koberg
• Dan Lash