The Need:

In low-resource healthcare, oxygen concentrators are a low cost solution when expensive bottled gasses are not available. They are used extensively in EWH partner hospitals. However, oxygen concentrators have a limited lifespan and need continual testing. Furthermore an oxygen tester is extremely useful in troubleshooting problems in concentrators and other equipment, such as anesthesia machines. The development of extremely economical computers, such as the Raspberry Pi, created the opportunity to develop open source training tools. EWH is interested in developing a low-cost oxygen analyzer that can be used in the training of BMETs.

The Technology:

Raspberry Pi and associated accessories
Integrated Display (Optional)

There are several approaches that could be examined for measuring oxygen concentration. Previously, an EWH chapter utilized a oxygen sensor found with-in oxygen concentrators to develop a low cost testing device. Another proof of concept design used two zinc-air batteries in a simple electric circuit with an LED for indication. More testing is necessary to determine the functional range of the tester and the characteristics of the circuit with exposure to different oxygen concentrations over different time periods.

Specifications and Restrictions:

This device should be for education use, and is not intended for testing medical equipment in a healthcare setting.

Include relevant resources for training
Similar interface to professional Oxygen testers used in healthcare

Resources and Previous Work:
PortO2 tester design:

Zinc-air sensor proof of concept. Further development is needed to improve accuracy: