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The Ambulatory Raynaud's Monitor wraps around a patient's finger and is secured with a bandage or medical tape. It contains two sensors that alternately record skin and ambient temperature — indicators of surface blood flow — every 36 seconds. A week's data is held by the monitor's electronics and is retained even if the device's power is unexpectedly interrupted.

The monitoring system's batteries store enough energy to operate for several months, and devices can be cleaned and reinitialized for use with multiple patients.

The device was developed by APL researchers, in collaboration with physicians from the Johns Hopkins Scleroderma Center, to objectively characterize a patient's condition and severity, measure symptoms in real time, and help gauge treatment effectiveness. The team recently completed initial trials of the miniature device at the Johns Hopkins Medical Institutions in Baltimore.

Credit: Johns Hopkins University Applied Physics Laboratory

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