• About

Pulse-Dose Oxygen Conservation System

The surge of COVID-19 cases in India and around the world has resulted in an acute oxygen shortage. Oxygen therapy through nasal cannula with flow rates of 1 - 6 L/min is an effective treatment for many COVID-19 patients in non-critical conditions and can help prevent disease progression. The same treatment is also used in post-acute care recovering COVID-19 patients. Here we describe a simple, open source, and rapidly manufacturable oxygen conservation device for use with dual port nasal cannulas which can extend the life of the current oxygen supply by almost two or three times, and which we hope will help towards coping with the ongoing crisis.

Overall schematic of the prototype device.

Fig. 1: Overall schematic of a functional prototype of the proposed device.

Project Information

All information about this project is documented on this website, as well as in a medRxiv preprint currently under submission.

Last Update: May 19, 2021

Note: This is a draft document and subject to change. Please read the full medical disclaimer below.


This project is part of an umbrella of projects initiated by the Prakash Lab, Stanford, and community partners across the globe to bring accessible tools to mitigate impact of COVID-19. The projects are being released in an early phase as open hardware to broaden and grow the number of teams across the globe to join and engage. We partner with manufacturers, and we help and support them to bring these ideas into the market. These partners take ownership of regulatory processes in their respective countries, and we support them in clinical validation work per local rules. If you would like to engage and help scale these solutions, especially in countries with a COVID-19 surge or anticipating oxygen shortages in near future, please reach out to us via email ([email protected] and [email protected]). We intend to build and engage a global community of clinicians, engineers, manufacturers and regulatory organizations to bring affordable solutions to communities around the world.

The work documented on this website is released under the Solderpad Hardware License v2.1, a permissive license for open hardware designs.

Medical Disclaimer

The following content, including but not limited to project descriptions, preliminary test results, figures/images, and prototypes, published here is meant to maximize potential public benefit during the COVID-19 crisis, specifically in addressing the urgent needs in India.

PLEASE NOTE: The content has not been peer reviewed. The Authors make no representations or warranties of any kind (express or implied) relating to accuracy, safety, usefulness, usability, marketability, performance, or otherwise of the content released here. The Authors disclaim all express and implied warranties of merchantability and fitness of the content for a particular purpose, and disclaims all express and implied warranties regarding non-infringement of any patent, copyright, trademark, or other rights of third parties in the content or use of the content, or in the making, using, or selling products or services by any person or entity.

People or entities attempting to use the content in any way, including creating products or offering services, assume all risk and responsibility related to those uses, including all legal and regulatory compliance, safety, efficacy, performance, design, marketability, title, and quality. The Authors assume no liability related to the actions of third parties and in respect of any infringement of any patent, copyright, or other right of third parties.

Prakash Lab