Telomy Patch

2026Telomy, Product architect

Chest ECG wearable

In development

A 110 mm infinity-shaped chest patch that records single-lead ECG, pulse, skin temperature and motion over the heart.

telomy.com/devices

110 mm: infinity-shaped housing
500 Hz: ECG sampling, beats found on the device
18 g: weight target

What Kumar did

Architected the patch and wrote design spec v2.0 for the product and PCB teams.
Designed the flexible waist and the three-island rigid-flex board so a 110 mm patch follows the breastbone.
Built 3D-printed fit prototypes to test the form on the body.

What it is

Telomy's own chest sensor, shaped around the infinity in the Telomy mark. It sits at the centre of the chest, where a ring or a watch cannot record an ECG.

How it works

Two hydrogel electrodes 58 mm apart pick up the heart's electrical signal, an optical window reads pulse and a metal disc reads skin temperature. The planned firmware samples ECG at 500 Hz, finds each beat on the device and sends the intervals over Bluetooth, buffering to memory when the phone is out of reach, such as inside a shielded therapy chamber.

Engineering

Two rigid lobes are joined by a flexible waist that bends 13° each way, so the patch follows the breastbone; a rigid 110 mm part would leave a 10.8 mm gap on a slim chest. The electronics sit on three rigid islands of one rigid-flex board, and the infinity mark doubles as the button.

Specifications

Housing	110 × 52 mm
Height on skin	7.3 mm
Weight target	18 g or less
Electrodes	Ag/AgCl hydrogel, 58 mm apart
Sensors	Single-lead ECG, PPG, skin temperature, 6-axis motion
ECG sampling	500 Hz, beats found on the device
Radio	Bluetooth Low Energy
Memory	64 Mb flash for buffering
Battery	About 200 mAh, about a week (estimate)
Adhesive wear	3 to 5 days per patch
Colours planned	Pearl White, Midnight Grey, Champagne Gold, Matte Black, Forest Green

A flexible waist that follows the chest
The infinity mark is the button
Records inside shielded chambers
A magnetic dock that fits one way