An ultrasonically excitable tool or probe is provided with a central bore, and a coupling for attachment to an ultrasonic transducer also provided with a central bore. Fluid may be injected along the communicating bores for filling a bowl or concavity on a distal end of the tool. Upon energization of...http://www.google.com.au/patents/US6799729?utm_source=gb-gplus-sharePatent US6799729 - Ultrasonic cleaning and atomizing probe
