How To Make Your Own Accurate Test Lungs for Testing Emergency Ventilators

Alex’s test lung set up
(A Commercial test lung with a resistance tube and barbed bleed adapter.)

How Doctors Measure Pressure

A smaller port in the airway makes taking a pressure measurement easier.

Compliance

Different lungs or diseases have different compliance curves

Resistance

Commercial Test Lungs

Constructing Your Own Test Lungs

Constructing Compliance from a Glass Vessel

(Inexpensive 41.6 liter or 11 gallon test lung, measured compliance C28)
(Classic adult test lung from from Hill 1965; the 50 liter or 13 gallon glass demijohn inside a wicker basket on the right is the test lung, the device on the left is a pump)
Typical brewing carboys
(Vessels of different sizes: 3 to 14 gallons)

Safety Note

Constructing Compliance with Plastic Sheets and Bags

(IMT SmartLung — commercial version of a bag between flat plastic springs; adjustable length of spring changes C value. Price: $650)

Constructing Resistance

(A commercial adapter offering three resistances by having thin plates with 3 different hole sizes.)

Other approaches

Conclusion

Public Invention

References

Materials and equipment needed

--

--

--

Public Inventor. Founder of Public Invention. Co-founder of @18F. Presidential Innovation Fellow. Agilist. PhD Comp. Sci. Amateur mathematician.

Love podcasts or audiobooks? Learn on the go with our new app.

Recommended from Medium

Top 5 Medicinal Uses For Vicks Vaporub

Are Energy Drinks Detrimental to Heart and Blood Vessel Health?

It’s a Small World After All

We are losing our freedom for our beliefs

When Pandemics Collide: The Intersection of COVID-19 and America’s Opioid Crisis

I got an IUD | Here’s How My Body Changed

Motivation, Tips and Tricks to Help You Keep Healthy New Year Resolutions

No One Wants a Pap Smear But It Can Save Your Life

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Robert L. Read

Robert L. Read

Public Inventor. Founder of Public Invention. Co-founder of @18F. Presidential Innovation Fellow. Agilist. PhD Comp. Sci. Amateur mathematician.

More from Medium

“Learning in the flow of work”?

Getting the most out of workshops

URBAN AND SUBURBAN DIFFERENCES

How workplace feedback can create a cultural revolution