Two large inner electrodes are the whole story: a newly published USPTO patent suggests Amazfit is exploring a Helio Ring design that could fold ECG, body composition sensing, EDA, temperature signals, and charging contacts into the same tiny surface area.
That matters because the current Amazfit Helio Ring already carries heart rate and SpO2, skin temperature, and EDA sensors. The patent, published on July 30, 2026, points to a more ambitious ring architecture with two added rounded electrodes covering a large portion of the inside of the band, according to Notebookcheck. The caveat is just as important: a patent is not a launch plan. It only shows what Amazfit has been working on.
Two electrodes could turn Helio Ring from passive tracker into medical-adjacent hardware
The proposed design is not just “more sensors.” It is a space strategy.
Smart rings have less room than watches for batteries, antennas, optical modules, charging contacts, and skin-facing sensors. The patent’s answer is to make the same two electrodes do several jobs. Notebookcheck says the electrodes are intended to replace the existing EDA stress-measurement function, operate as a single-lead ECG, work as a BIA sensor, and also serve as charging contacts through their metallic surface.
That changes the profile of the Helio Ring concept. The current product fits the familiar ring pitch: passive, low-friction tracking for heart rate, oxygen saturation, temperature, stress, recovery, and sleep-adjacent metrics. The patent pushes toward a more active health device, where the ring could capture electrical signals from the body rather than only relying on optical sensing and surface-level physiology.
Amazfit’s own positioning already frames Helio as a multi-input training system:
“Training doesn’t happen in one place or one signal. Helio works across every training world.”
That line from Amazfit’s US site is marketing, not evidence of a product roadmap. But it does fit the patent’s logic: a ring that collects more kinds of signals without becoming bulky.
A single-lead ECG on the finger would be the patent’s sharpest upgrade
The headline feature is single-lead ECG. In wearables, ECG measures electrical activity from the heart. That is different from optical heart rate tracking, which estimates pulse patterns using light reflected from blood flow.
Notebookcheck says the patented electrodes would make it possible, “as with many smartwatches,” to detect certain heart rhythm abnormalities. The supplied material does not name specific disorders, so any claim about atrial fibrillation or other named conditions would go beyond the source. The defensible reading is narrower: Amazfit is exploring ECG-style rhythm detection in a ring form factor.
The finger is a logical place to try this. A ring can maintain long periods of skin contact, especially overnight, while avoiding the bulk of a wrist device. That does not automatically mean better ECG data. Fit, orientation, user behavior, electrode placement, and software all matter. But the patent’s large curved electrodes appear designed to increase contact area, which is one of the obvious constraints in a tiny device.
MLXIO analysis: if Amazfit commercializes this, the likely first use would be controlled spot checks rather than invisible diagnosis. The patent coverage does not describe a finished ECG workflow, and Gadgets & Wearables notes that the document does not explain how a wearer would complete a reading. An outer contact could theoretically support a smartwatch-like gesture, but that remains an inference from the described design, not a confirmed feature.
BIA would widen the Helio Ring beyond sleep, stress, and recovery
The second major sensor path is BIA, or bioelectrical impedance analysis. The source material says the same electrodes could estimate body composition by analyzing body fat, muscle, and water content, similar to the function Notebookcheck attributes to the Samsung Galaxy Watch9.
That would give a future Helio Ring a different kind of health profile. Current smart rings often win on comfort and continuous wear. Watches usually win on sensor variety and interaction. A ring that adds ECG and body composition sensing narrows that gap, at least on paper.
| Feature area | Current Amazfit Helio Ring | Patent-described Helio Ring concept |
|---|---|---|
| Heart rate / SpO2 | Present | Present in described platform |
| Skin temperature | Present | Present in described platform |
| EDA stress sensing | Present | Could be handled by large electrodes |
| ECG | Not described as current feature | Single-lead ECG described |
| BIA body composition | Not described as current feature | Described through electrodes |
| Charging | Docking station | Metallic electrodes plus charging case shown |
The design also speaks to a broader technical problem: every added ring feature competes with battery size, comfort, thermal limits, and internal routing. Using one electrode pair for multiple functions is not just elegant. It may be necessary.
That is why adjacent sensor-heavy ring ideas matter. MLXIO has covered how the category is stretching from wellness into harder biometrics, including the 5-gram CHARM smart ring’s sweat glucose bet and a $399 blood pressure smart ring concept aimed at cuffs. Those projects are separate from Amazfit, but they show the same pressure point: rings are being judged by how much signal they can collect without becoming uncomfortable jewelry.
The July 30 patent reveals a charging rethink, not just a sensor grab
The charging detail may be less flashy than ECG, but it could matter more in daily use.
Notebookcheck says the patent shows a charging case that could make it easier to recharge a future Helio Ring on the go without carrying the docking station. Gadgets & Wearables adds that the original Helio Ring uses a small dock, and describes the case as a useful change because alignment could be fiddly.
The patent also describes metallic electrode surfaces that can act as charging contacts. That means the same inner hardware could support both physiological readings and power transfer. In a ring, eliminating duplicate contacts can free internal space for battery, board layout, or mechanical thinning.
Gadgets & Wearables reports that the patent describes two large, curved electrodes that can cover more than two-thirds of the ring’s internal circumference. It also mentions a curved battery and circuit board occupying separate sections around the ring, with the stated goal of using space efficiently and reducing thickness.
MLXIO analysis: this is the clearest product-design signal in the patent. ECG may face software, validation, and potentially regulatory hurdles depending on how Amazfit markets it. A charging case and consolidated electrodes are more straightforward improvements to the ring experience.
Smartwatches still set the benchmark, but the ring form factor is catching up feature by feature
The patent compares naturally with watches because Notebookcheck itself makes that connection: ECG rhythm detection is already familiar on many smartwatches, and BIA is referenced against the Samsung Galaxy Watch9.
That comparison cuts both ways. Watches have more surface area, bigger batteries, screens, and more obvious user interaction. Rings have a cleaner always-worn form factor, especially for sleep and low-distraction tracking. The patent is interesting because it tries to import watch-like health features into the ring’s smaller body.
Amazfit may also have a brand-level reason to pursue this. Its US site now organizes products around training categories and presents Helio Devices as part of a broader system rather than a one-off ring. MLXIO has also tracked Amazfit’s push across wearables, including 3 Amazfit smartwatches turning iPhone alerts into action. That does not prove the next Helio Ring will launch with ECG, but it does show why a richer ring could fit Amazfit’s device strategy.
The risk is overclaiming. A patent can describe possibilities that never become shipping features. It can also bundle several concepts into one filing, some mature and some speculative. The strongest grounded claim is simple: Amazfit has explored a smart ring architecture where large electrodes expand sensing while also simplifying charging.
The next proof points: product filing, clearance language, and battery claims
The decisive evidence will not be the patent. It will be a product listing, regulatory filing, user manual, or launch page that confirms which functions survived engineering trade-offs.
Three details would strengthen the case for a real Helio Ring 2 upgrade:
- ECG workflow: Clear instructions for how the user completes a reading.
- BIA implementation: Whether the ring uses only inner electrodes or adds an outer contact / second wearable.
- Charging design: Whether the case replaces or supplements the dock.
The biggest weakening signal would be a future Helio Ring that keeps the same core sensor set and only changes industrial design. That would suggest the patent remains an R&D branch, not the next product.
For buyers, the practical takeaway is restraint. Do not treat the USPTO publication as a launch promise. Treat it as a map of Amazfit’s priorities: more electrical sensing, fewer dedicated components, and a ring that may be asked to do work once reserved for the wrist.
Impact Analysis
- ECG and body composition sensing would make the Helio Ring more competitive with advanced health wearables.
- Combining sensors and charging contacts into two electrodes could solve major space constraints in smart rings.
- Because this is only a patent, readers should treat it as a signal of R&D direction rather than an upcoming product guarantee.
