An ultrasonic surgical instrument has a shaft and a probe head, the shaft and the probe head have a lumen or channel and a longitudinal axis and the probe head having a distal end face. The probe head has at least one operative surface engageable with organic tissues for the application of ultrasonic vibratory energy to the tissues. The end face is oriented at least partially transversely to the axis. The lumen or channel has a first outlet opening in the end face and at least one second outlet opening in a lateral surface of either the shaft or the probe head at a position spaced from the end face. The probe head has a plurality of teeth extending laterally from the end face, in two rows on opposing side of the end face.
