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Low-Cost Opensource Mechanical Ventilator

ventilator_FullSizedGIF.gif Low-Cost Opensource Mechanical Ventilator
2020-05-06 22-05-34.JPG Low-Cost Opensource Mechanical Ventilator
2020-05-06 22-04-40.JPG Low-Cost Opensource Mechanical Ventilator
2020-05-06 22-04-52.JPG Low-Cost Opensource Mechanical Ventilator
acuator_ServoMount.stl Low-Cost Opensource Mechanical Ventilator
arduino_rack_ControlPanel.stl Low-Cost Opensource Mechanical Ventilator
BVM_Mountings.stl Low-Cost Opensource Mechanical Ventilator
cover_supports.stl Low-Cost Opensource Mechanical Ventilator
crossSupport.stl Low-Cost Opensource Mechanical Ventilator
hardware.stl Low-Cost Opensource Mechanical Ventilator
Latch_StandIn.stl Low-Cost Opensource Mechanical Ventilator
leftMainBody.stl Low-Cost Opensource Mechanical Ventilator
LeftRight_Cover_ends.stl Low-Cost Opensource Mechanical Ventilator
powerSupplyMount_Prototype.stl Low-Cost Opensource Mechanical Ventilator
rightMainBody.stl Low-Cost Opensource Mechanical Ventilator
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Creation quality: 5.0/5 (5 votes)
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SKP and STL Folder details Close
  • BVM_Mountings.stl
  • Latch_StandIn.stl
  • LeftRight_Cover_ends.stl
  • Ventilator_V1_upload.skp
  • acuator_ServoMount.stl
  • arduino_rack_ControlPanel.stl
  • cover_supports.stl
  • crossSupport.stl
  • hardware.stl
  • leftMainBody.stl
  • powerSupplyMount_Prototype.stl
  • rightMainBody.stl

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Last update 2020-05-09 at 20:58
Publication date 2020-04-17 at 12:42
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Published to Thingiverse on: 2020-04-17 at 11:16
Design number 135879
AppliedTechnologyLab

AppliedTechnologyLab

3D printer file info

3D model description

UPDATE May 10, 2020: We've redesigned the actuator to make it stronger and more reliable after issues with the gear slipping out of place. The actuator arm's point of contact has been made smaller to improve compression. We've also added designs for our control panel including knobs for the potentiometers used to control compression rate and percentage.

NOTE: This is a prototype. It is developed for educational purposes only and has not been evaluated by or approved for use by medical professionals.

Introduction: This is a low-cost opensource mechanical ventilator. It uses an Arduino controlled 25kg-cm servo driven linear actuator to compress a bag valve mask (the resuscitation bags you see paramedics using to keep patients alive until they reach the hospital).

A video showing the ventilator working can be found here: https://www.youtube.com/watch?v=-b31fEGbNqg

More information can be found in the full-length article regarding the design here: http://www.progressth.org/2020/04/low-cost-opensource-mechanical.html

Details: For now, please open up the SketchUp 2017 file to see how parts are laid out for 3D printing, how they fit together, and note the labels describing what each part is.

We will be developing more documentation once the design is closer to something truly useable and are providing these files now just so anyone interested has a starting point.

We used friction welding and M3 nuts and bolts for assembly. There is also the use of 20mm PVC pipe which is easily sourced in Thailand but might not be where you live.

Arduino Code: Check out Wayne Smythe's code here:

https://viralresponse.io/@progressth/low-cost-auto-ventilator/issues/code-for-the-servo-and-two-selector-knobs-to-adjust-the-rate-of-compression-and-the-length

It requires an Arduino Uno and two potentiometers used to control the servo.

Credit The linear actuator is based on this model: https://www.thingiverse.com/thing:3170748

We beefed it up a bit and made the main drive gear bigger to allow for a longer throw of the actuator (up to 100mm). The original model is an excellent baseline for a servo-based linear actuator.

The concept was widely guided by this MIT student project from 2010: https://e-vent.mit.edu/wp-content/uploads/2020/03/DMD-2010-MIT-E-Vent.pdf

We changed the swinging cam to a linear actuator.

3D printing settings

The actuator set needs supports for the end of the arm. Everything else can be printed without supports.

Printed using PLA on a 300x200x200mm Thai-built Ultimaker clone called an ExtraBot.

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