Updated Fitbit patent points to finger-worn blood pressure sensor
Fitbit continues to show interest in developing a blood pressure monitoring device, and a newly granted patent suggests the idea is very much alive. The updated document builds on a previous filings and provides more detail on an innovative blood pressure monitor that captures measurements from the finger.
The original patent filing
That earlier applications described a system that could apply and regulate pressure via a motorized mechanism. A tightening element would increase the compression against the skin to partially occlude an artery. A sensor—such as a PPG (photoplethysmography) unit—would then be used to gather cardiovascular data during the controlled application of pressure.
What stood out in that filing was the device’s form factor. The patent illustrations showed something that wrapped around a user’s finger. This suggested the possibility that Fitbit might be working on an entirely new product category, potentially a ring-like health tracker or a finger clip designed for occasional use.
What’s new in the updated patent
The latest patent, published a few days ago by the US Patent Office (US 12,251,205 B2), doesn’t fundamentally change that concept. But it does add technical depth.
The device is still finger-worn, and it includes a band or strap that can be tightened circumferentially around the finger. A motor or actuator—specifically, a lead screw or cam-driven mechanism—applies force to increase pressure in a controlled way. This is used to alter the blood flow in the underlying arteries, allowing physiological signals to be measured under compression.
The patent also includes a pressure sensor to monitor exactly how much force is being applied. This allows for feedback-controlled actuation, which should improve both safety and measurement accuracy.
As in the earlier patents, a PPG sensor detects pulse waveforms. These are then used in conjunction with the applied pressure data to estimate blood pressure without a traditional inflatable cuff. The idea is to capture the point at which blood flow is altered or restored, which correlates with systolic and diastolic values.
There’s no mention of wrist placement, watches, or even broader smartwatch functionality in this document. This is very much a standalone health sensor worn on the finger, with no screen, no UI, and no reference to integration into existing Fitbit devices.
What it means
If Fitbit ever brings this to market, it could result in a compact, purpose-built blood pressure tracker. Something like a ring or finger clip—possibly intended for use a few times per day, rather than continuous wear. It might also mark the transition of Fitbit to a company that moves beyond fitness bands and smartwatches. Currently, there is a question mark on whether the company would be dishing out new smartwatches as Google seems to have picked up the mantle in this regard.
Essential reading: Top fitness trackers and health gadgets
Whether the finger-based blood pressure monitor becomes a consumer product remains to be seen. Fitbit has shown an ongoing interest in such a device, and this patent shows a clear technical path for achieving that. It also gives the company more flexibility to offer health-tracking tools without shoehorning them into existing smartwatches.
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