An ultrasonic horn for use with an ultrasonic surgical hand piece including a resonator comprises a contacting annulus having a plurality of angled lands. The lands are alternated around the annulus such that adjacent lands have opposite angles. As a result of the adjacent angled lands, a shear stress...http://www.google.com/patents/US20090312692?utm_source=gb-gplus-sharePatent US20090312692 - SHEAR STRESS ULTRASONIC HORN FOR ULTRASONIC SURGICAL ASPIRATION
