Apple Blood Oxygen Feature Workaround Sparks Fresh Masimo Lawsuit
Medical technology company Masimo on Wednesday filed a lawsuit against U.S. Customs and Border Protection in which it challenged the agency's decision to allow Apple to restore blood oxygen monitoring to its Apple Watch models (via Bloomberg Law).

In a complaint filed Wednesday in the US District Court for the District of Columbia, Masimo said that Customs acted unlawfully when it ruled on August 1 that Apple can import watches with pulse oximetry technology – a reversal of the agency's decision from last year – without notifying Masimo. Masimo said it only discovered the ruling on August 14, when Apple publicly announced it would be reintroducing the pulse oximetry functionality through a software update.
The medical device maker claims Customs and Border Protection exceeded its authority when it issued the ruling permitting Apple's redesigned approach. Apple's workaround offloads blood oxygen calculations from the Apple Watch to a paired iPhone, where it performs similar functionality to what the ITC originally judged to have infringed Masimo's patents.
Masimo is seeking a temporary restraining order and preliminary injunction to block the Customs decision. "CBP's function is to enforce ITC exclusion orders, not to create loopholes that render them ineffective," Masimo said.
The dispute originates from an International Trade Commission ruling in December 2023 that found Apple's blood oxygen sensors infringed Masimo's patents, leading to an import ban on Apple Watch Series 9 and Ultra 2 models that have the feature enabled.
Apple paused sales in the U.S. for several days before resuming them on January 18, 2024. The Series 9 and Ultra 2 models then went back on the market without blood oxygen monitoring, up until Apple's release of iOS 18.6.1 and watchOS 11.6.1 last week, which shifted the feature's calculations to paired iPhones.
Popular Stories
iOS 26 was released last month, but the software train never stops, and iOS 26.1 beta testing is already underway. So far, iOS 26.1 makes both Apple Intelligence and Live Translation on compatible AirPods available in additional languages, and it includes some other minor changes across Apple Music, Calendar, Photos, and Safari.
More features and changes will follow in future versions,...
Nearly two weeks after the iPhone 17 series launched, analysts at investment banking firm Morgan Stanley said demand for the devices has been "modestly stronger than we originally expected," based on a combination of extended shipping estimates on Apple's online store and information it gathered from Apple's supply chain.
There has been strong early demand for the iPhone 17, iPhone 17 Pro,...
A handful of upcoming Apple products leaked yesterday, through a combination of YouTube videos out of Russia and U.S. Federal Communications Commission (FCC) documents that were released, despite Apple's confidentiality requests.
The leaked products include an iPad Pro with an M5 chip, as well as updated MacBook Pro and Apple Vision Pro models. All of these devices had already been rumored...
Apple's two big yearly events, WWDC and the iPhone launch, are done and over with, but there are still some new products that we're expecting to see before the end of the year.
Apple TV
The Apple TV hasn't been updated since 2022, so it's due for a refresh. It doesn't look like Apple is going to change the design of its set-top box, but we can expect a faster chip
Apple code suggests...
The MacBook Air is Apple's most popular laptop – a thin, fanless machine that wields quiet power thanks to the efficiency of Apple silicon. While the M4 model isn't exactly old, attention is already turning to its successor.
Apple doesn't telegraph new product launches ahead of time, but we can draw a surprisingly clear picture of what to expect by looking at Apple's silicon roadmap,...
Apple's annual iPhone event is in the rearview mirror, but rumors suggest the company plans to release a handful of additional products before the year ends.
Will there be another Apple event this October? We discuss the possibility below.
Apple in October
Apple's most recent October events were in 2021 and 2023.
In 2022 and 2024, Apple did not host an October event. Instead, it...
In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps.
Apple recently revealed that the feature would soon be available in North Dakota, and starting today, the feature has officially gone...
Earlier this year, Apple released the $599 iPhone 16e – a budget-friendly late addition to its iPhone 16 series and a replacement for its long-running entry-level iPhone SE line. Given the iPhone 17 lineup has now launched, can we expect an iPhone 17e anytime soon?
If you're holding out for a more affordable device with the 17 moniker attached, here's everything we know so far about the...
Apple released iOS 26 in mid-September, bringing a range of new features and changes to iPhones across the globe. But not all of the included improvements have been showcased with Apple's typical fanfare, and many are likely to have been overlooked.
Below, we've highlighted 26 lesser known additions and enhancements that could potentially change how you use your iPhone on a daily basis. Got...