updates

pulseox/README.md

@@ -32,7 +32,7 @@ See the Background section for more information on how these sensors work, the A
 ![pulseox_plans](../img/pulseox_plans.jpg)
 
 ### 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.

[Richard Branson]

Zach - I am not sure this is in the correct place. I think there is a big difference between a hospital or health system (as Dr. Baker suggests) using oximetry and telemonitoring of patient (a good idea) and allowing patients (the public) to monitor themselves and perhaps make bad decisions. The industry is reaching into the area already. You may unsubscribe from future sponsor emails by clicking here.

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