Wrist-worn tracker for four vital parameters

The wrist is where a patient will actually tolerate wearing something for days at a time. It is also a poor place to take an optical measurement: perfusion is lower than at a fingertip or an earlobe, and every movement of the arm disturbs the skin contact the reading depends on.

Four parameters compound it. Sensing elements crowded into one small patch of skin compete with each other, and every gram and milliamp spent compensating works against the comfort and battery life that decide whether the device stays on the patient at all.

Rather than force every measurement through the wrist, we split the device. The wrist unit carries the electronics, battery and radio; the optical sensing sits on a short tethered clip that goes where the signal is actually good. The patient still puts on one device.

Respiration rate is derived from the signals already being captured rather than separately sensed, which keeps another sensor off the patient entirely.

Data streams to a companion app and onward to the cloud, so readings are available both to the wearer and to whoever is monitoring them remotely.

A single wrist-worn device reports SpO₂, pulse rate, respiration rate and body temperature, streaming continuously rather than requiring a spot measurement.

The work sits within our wider medical electronics practice, which spans design, testing and mass-production support.