Ultrasonic transducer device for respiration monitoring

Described herein are example ultrasonic transducer device probes configured to be placed on a patient's body to direct an ultrasonic beam towards an internal structure inside the body and receive ultrasonic echo signals from the internal structure. A probe includes a housing in which an ultrasonic transducer is located, a transceiving face of the transducer being at an acute angle relative to a front plane of the housing. An accelerometer unit and a magnetic field sensing unit are also housed inside the probe. The transducer, accelerometer, and magnetic field sensing unit are embedded in a body of a first material comprising ultrasound non-sonolucent material. A front face of the body of the first material and a recess extending down to the transceiving face is covered by a body of a second material comprising ultrasound sonolucent material having a tacky or non-tacky front surface.