Feed: Engadget is a web magazine with obsessive daily coverage of everything new in gadgets and consumer electronics
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Title: Masimo files lawsuit over Apple's 'redesigned' blood oxygen monitoring
feature

Date: Thu, 21 Aug 2025 13:00:54 +0000
Link: https://www.engadget.com/wearables/masimo-fil...

Masimo, the medical technology company whose lawsuit led to the temporary
sales pause of the Apple Watch Series 9 and Ultra 2, has sued the US Customs
and Border Protection days after Apple released its redesigned blood oxygen
monitoring feature. This is just the latest update in the lengthy legal saga
between Masimo and Apple, which started when the former sued the iPhonemaker
in 2021, accusing it of infringing on several of its light-based blood oxygen
monitoring patents. After a court sided with Masimo in 2023, Apple was forced
to stop selling the Watch Series 9 and the Ultra 2 in the US for a few weeks.


In order to circumvent the import ban for the devices, Apple removed the
Blood Oxygen app for the watch models sold in the US. Just a few days ago,
however, the company introduced a "redesigned Blood Oxygen feature" for the
Watch Series 9, Series 10 and Watch Ultra 2 models. The feature works by
measuring and calculating data from the watches' sensors on their paired
iPhones instead. Users will then be able to view their blood oxygen data in
the Respiratory section of the Health app.

Apple said the update was "enabled by a recent US Customs ruling." But Masimo
said in its complaint (via Bloomberg Law) that it only heard about the
ruling, which was handed down on August 1, when Apple made the announcement.
It argued that the agency typically requires both sides to be heard before
making such decisions and that Customs "exceeded its authority." Masimo is
now asking the court to put an injunction on UCBP's decision and, ultimately,
to only allow imports of the devices if their blood oxygen-tracking function
is disabled.

"Each passing day that this unlawful ruling remains in effect irreparably
deprives Masimo of its right to be free from unfair trade practices and to
preserve its competitive standing in the US marketplace," Masimo said.

This article originally appeared on Engadget at
https://www.engadget.com/wearables/masimo-fil...
redesigned-blood-oxygen-monitoring-feature-130054895.html?src=rss

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