Medical device company Masimo has filed a lawsuit against U S Customs and Border Protection, challenging the agency’s recent move to allow Apple to reactivate the blood oxygen monitoring feature on Apple Watches.

Masimo’s legal action stems from a longstanding patent dispute with Apple. In late 2023 the U S International Trade Commission issued an import ban on certain Apple Watch models after finding they infringed on Masimo’s patents related to pulse oximetry.

Apple responded by disabling the feature and later pushing software that shifted the oxygen calculation to the wearer’s iPhone rather than the watch itself.

The company learned of the Customs reversal in August only after Apple announced a software update re-enabling blood oxygen tracking via paired iPhones. According to Masimo

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