An apparatus and a method for an ultrasonic medical device to treat urolithiasis and ablate a stone. The ultrasonic medical device comprises an ultrasonic probe having a wire body with a proximal end, a distal end and a longitudinal axis therebetween and a plurality of tines extending from the distal end of the wire body. The ultrasonic medical device includes a sheath capable of surrounding the wire body and the plurality of tines. The ultrasonic probe is inserted into the sheath and the ultrasonic probe is moved until the plurality of tines surround at least a portion of an outer surface of the stone. An ultrasonic energy source engaged to the ultrasonic probe supplies an ultrasonic energy to the ultrasonic probe to produce a transverse ultrasonic vibration along at least a portion of the ultrasonic probe to ablate the stone.