[chrisfinazzo]

Disclaimer: I'm not a lawyer or an MD

The way that Apple added blood oxygen sensors to the Apple Watch seems instructive in showing how things have changed.

It's not a strictly a medical device -- with explicit disclaimers to that effect -- so making a diagnosis based on only those readings isn't something they would stand by. Defer to the experts.

Masimo's case seems to be looking for an answer to part of this question, determining whether or not the patents apply in nonclinical settings. Regardless of that outcome, it seems like there should be a legal distinction between these two classes of products as most reasonable people would argue they serve very different purposes.