Comment by 1123581321

They do not. Massimo's relevant patents have to do with their signal processing on user-worn devices. Cheap oximeters are clip-ons that only do rudimentary processing with strong beams of light through the fingers.

https://www.masimo.com/technology/co-oximetry/set/

https://patents.google.com/patent/US10912502B2/en (this is one that was cited by the trade commission.)