When I caught up with Mastrototaro at this year’s CES, he wasn’t fazed much. Instead, he pointed to the fact that the ring — now called Evie, short for “evidence”— successfully passed a hypoxia trial in October 2022, showing clinical-level accuracy for heart rate and oxygen saturation measurements. The FDA, Mastrototaro says, requires accuracy across a broad range of oxygen levels with a margin of error of 4 percent. That has to be tested for women, men, and people of all skin tones. The Evie Ring delivered an error margin of 2 percent. But the testing isn’t done. Next up is a trial for pulse oximetry, or blood oxygen saturation, metrics. 

“As a medical company, we have to conduct clinical trials,” Mastrototaro says. To get FDA clearance, Movano has to maintain documentation throughout the development and testing processes, and production has to be done at a medical device manufacturing facility. Another thing medical device companies must do is ensure that their data practices are HIPAA compliant. Things like communication protocols, cloud infrastructure, and cybersecurity need to be included as part of the FDA filing — and those protocols have to be tested by a third party. Mastrototaro says that clinical accuracy is “less than 1 percent” of everything that gets filed to the FDA.

But if successful, the Evie Ring would be one of the first consumer wearables fully cleared as a medical device. 

FDA clearance may also be the only way a company can get novel health tech into the hands of consumers. For the past few years, Valencell — a wearable tech provider to companies like LG, Jabra, and Bose — has been at CES showcasing its noninvasive blood pressure monitoring tech using photoplethysmography (PPG) sensors. The surprise at this year’s CES was that Valencell’s decided it’s getting into the consumer hardware game itself with a $99 cuffless, calibrationless fingertip blood pressure sensor. 

The device looks like a fingertip pulse oximeter. It’s worn on the middle finger, where a PPG sensor shines light into the skin. The device then measures the light that’s reflected back and runs it through Valencell’s algorithm, which is based on a dataset of 7,000 people. That’s all it will purportedly take to get accurate diastolic and systolic measurements. 

Making it easier and more convenient to measure blood pressure could greatly improve hypertension treatment. After all, treatment heavily depends on taking consistent measurements. While the CDC says a third of American adults have high blood pressure, the Mayo Clinic estimates that 62 percent of Americans only measure their blood pressure a few times a month — far less than the recommended twice per day. And yet, Valencell’s tech has been around for years without takers, despite its experience in the field.

“We tried to push [Valencell’s blood pressure tech] into the marketplace in other folk’s products, and we ran up against resistance,” Valencell president and co-founder Steven LaBoeuf explained to The Verge. Any company that would want to create this sort of product or a feature using Valencell’s blood pressure tech would have to go through the FDA — and none wanted to take that challenge. LaBoeuf said the FDA essentially told the company that, to get clearance, it needed to have a commercial product with the technology in it. 

“We realized the only way for us to do that was to make our own product,” says LaBoeuf.

The other issue is that no one had submitted an over-the-counter cuffless, calibrationless blood pressure device to the FDA before. That meant the FDA had to come up with a testing plan for Valencell’s device — a major reason why Valencell opted to go with a fingertip monitor design that both the FDA and medical community would be more familiar with. A wrist-worn gadget would require additional — more complicated — testing, as it’s a continuously worn device. (As in, you’d have to validate a smartwatch’s blood pressure accuracy while lying down, sitting up, during sleep, and a whole other range of scenarios.) The effort wouldn’t have necessarily made sense given that doctors are still grappling with how to make the best use of wearable data.

Right now, Valencell says it aims to get FDA clearance by the end of this year. But that’s an “if all goes well” timeline. You only need to look as far as Withings’ history of CES announcements to see you can’t ever predict when you’ll get FDA clearance. Multiple Withings products have either never made it to US markets or took over a year to arrive due to the regulatory process. For instance, the Withings ScanWatch was introduced at CES 2020. It didn’t get the go-ahead to sell in the US until nearly two years later.