This video documents the build of an iron lung respirator using hand tools and readily available components using basic fabrication skills. This purpose of this build is to validate the design as outlined in Roadmap for the Design of an Iron Lung Respirator:
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pdf version:
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The purpose is not a step by step set of instructions but examples of how to build an iron lung using components available in my area. Other components may be substituted depending on the availability. This video's purpose is to encourage further development.
Part 2 demonstrates the design concept: Building an Iron Lung Respirator Part 2 of 2:
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The volume of air is controlled by the stroke of the bellows. The vacuum and pressure are controlled by simple reed valves. The breathing cycle is controlled by the cadence of the bellows.
Popular Mechanics Emergency Wooden Respirator Plans January 1952 pdf:
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Here is an Open source Positive Pressure Ventilator design that does not use electronic control systems:
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WARNING:
Respirators are not toys and can severely damage a patient’s lungs or kill the patient if not used properly!
Only qualified medical personnel should be operating respirators or those under the direction of a qualified medical person
Vacuum Testing a Concrete Form Tube:
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Successful Vacuum tested two 55 gallon steel drums welded/soldered together to 150 cm of h20:
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Further testing revealed that the loud banging heard is cause by the lid and bottom being "sucked in". Both end pieces would be replaced in an iron lung and the loud banging noise may not be important. The bottom would be replaced with a bellows and the lid replaced with a head piece. This was determined during these videos:
Part 1 of 2: Use a Vehicle's Intake Manifold as a Vacuum Source
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part 2 of 2: Use a Vehicle's Intake Manifold as a Vacuum Source
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Alternative resources to 55 gallon steel drums: Fiber concrete column forms, or forming tubes (made of a thick cardboard), large air compressor tanks, propane tanks, etc..
**_ Respirator ventilators are not toys and can damage a patient’s lungs or kill the patient if not used properly! ***
--- Only qualified medical personnel should be operating them or those under the direction of a qualified medical person.---
This is an excellent resource to learn about respirators and lung function:
A Guide to Designing Low-cost Respirators:
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Other Resources:
PDF version:
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How to make a Manometer
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1956 Iron Lung
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Kansas City polio survivor is one of last iron lung users in U.S (18 cm of water)
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The Last Few Polio Survivors
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The Iron Lung and Polio
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The Iron Lung
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The Both Mechanical Respirator (1939) part 1 of 3 series
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Artificial Respirators (1940s?) Part 1 of 6 Part Series
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55 Gallon Drum Vacuum Test
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How To Make a One-Way Check Valve - For Cheap!!
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Example reed valve operation at the 26 sec mark:
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