From 0d96c692aae8b6da49b9f80be30ad48b557cd26c Mon Sep 17 00:00:00 2001 From: Zach Fredin <zach.fredin@cba.mit.edu> Date: Tue, 26 May 2020 09:22:02 -0500 Subject: [PATCH] updates --- pulseox/README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/pulseox/README.md b/pulseox/README.md index b78874f..a8fa8c6 100644 --- a/pulseox/README.md +++ b/pulseox/README.md @@ -32,7 +32,7 @@ See the Background section for more information on how these sensors work, the A  ### Questions -Is there a need for a crude, distributed-fab coronavirus early warning device? Something that, rather than giving an absolute SpO<sub>2</sub> reading, provides a go/no-go indication relative to an initial condition. The standard for commercial pulse-ox devices is master calibration in a clinical trial using human subjects that deliberately enter a hypoxic state. Instead, what about a cheap indicator that simply indicates the change in SpO<sub>2</sub> since its first measurement, using a green-yellow-red indication rather than a digital display? Such a device could be provided to patients to wear continuously upon hospital discharge (or an asymptomatic positive covid-19 test result), and would give them an indication when they need to call their doctor due to plunging blood oxygen content. Crucially, the device would be cheap and would not require specialized components, so it could be made easily anywhere. +The standard for commercial pulse-ox devices is master calibration in a clinical trial using human subjects deliberately entering a hypoxic state. Alternatively, <b>what about a cheap indicator that simply indicates the change in SpO<sub>2</sub> since its first measurement, using a green-yellow-red indication rather than a digital display?</b> Such a device could be provided to patients to wear continuously upon hospital discharge (or an asymptomatic positive covid-19 test result), and would give them an indication when they need to call their doctor due to plunging blood oxygenation. Crucially, the device would be cheap and would not require specialized components, so it could be made easily in Fab Labs around the world. ### References - overview of pulse oximetry physics and engineering challenges from 1989: Tremper, Kevin K., and Steven J. Barker. "Pulse oximetry." Anesthesiology: The Journal of the American Society of Anesthesiologists 70.1 (1989): 98-108. -- GitLab