Embodiments of the present invention include a medical apparatusthat includes a probe having a distal end configured forinsertion into a body cavity and containing a lumen that opensthrough the distal end, and an inflatable balloon deployablethrough the lumen into the body cavity, the balloon having anexterior wall. The medical apparatus also includes a flexibleprinted circuit board having a first side attached to theexterior wall of the inflatable balloon and a second sideopposite the first side, and an ultrasonic transducer mounted onthe first side of the flexible printed circuit board andencapsulated between the exterior wall of the balloon and theflexible printed circuit board.
