Ultrasound sensor aids diagnosis of middle ear infection

A prototype otoscope incorporating Frauhofer’s technology, developed by US company OtoNexus Medical Technologies, is undergoing clinical trials.

Antibiotics are the usual remedy for infection of the middle ear, particularly among infants and young children. However, the equipment used to diagnose the condition has not developed for decades, and doctors can only deliver a diagnosis that is accurate in as low as 50% of cases, in particular in distinguishing between bacterial and viral infections. This means that many children are prescribed antibiotics unnecessarily.

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The new otoscope, which is undergoing clinical studies, can tell doctors in a matter of seconds whether there is air or fluid in the middle ear, and characterise any fluid. This enables the doctor to distinguish between different stages of the illness and decide on the appropriate treatment.

“The classic otoscope is an optical system and hasn’t changed in decades,” explained Dr Sandro Koch, a physicist at Fraunhofer IPMS in Dresden. In the new device, the transducer emits ultrasonic pulses, captures the echo reflected from the eardrum, and generates a reading that tells the doctor about the degree of infection.