An ultrasonic tip for use with a surgical handpiece to produce both longitudinal and torsional motion, the handpiece including an ultrasonic transducer disposed within a housing , said ultrasonic tip comprising: a shaft having a longitudinal axis extending between a proximal end and a distal end, said proximal end having a first diameter (D1) and said distal end having a second diameter (D2), wherein said first diameter (D1) is greater than said second diameter (D2); a cutting feature coupled to said distal end of said shaft ; and an aspiration lumen defined by said shaft , said aspiration lumen configured to extend along said longitudinal axis of said shaft , said aspiration lumen configured to be placed in fluid communication with the handpiece ; characterized in that said shaft comprises a vibration conversion mechanism for converting a vibration energy transmitted from the ultrasonic transducer into a composite vibration composed of a longitudinal vibration along the longitudinal axis and a torsional vibration; and in that the ultrasonic tip further comprises: a protrusion on said shaft and positioned between said distal end and said proximal end with said protrusion being positioned distal to said vibration conversion mechanism along said longitudinal axis , a portion of said protrusion having a third diameter (D3), wherein said third diameter (D3) is less than said first diameter (D1) and said third diameter (D3) is greater than said second diameter (D2); and an aperture defined by said protrusion in fluid communication with said aspiration lumen , wherein said protrusion reinforces an area surrounding the aperture . a shaft having a longitudinal axis extending between a proximal end and a distal end, said proximal end having a first diameter (D1) and said distal end having a second diameter (D2), wherein said first diameter (D1) is greater than said second diameter (D2); a cutting feature coupled to said distal end of said shaft ; and an aspiration lumen defined by said shaft , said aspiration lumen configured to extend along said longitudinal axis of said shaft , said aspiration lumen configured to be placed in fluid communication with the handpiece ; characterized in that said shaft comprises a vibration conversion mechanism for converting a vibration energy transmitted from the ultrasonic transducer into a composite vibration composed of a longitudinal vibration along the longitudinal axis and a torsional vibration; and in that the ultrasonic tip further comprises: a protrusion on said shaft and positioned between said distal end and said proximal end with said protrusion being positioned distal to said vibration conversion mechanism along said longitudinal axis , a portion of said protrusion having a third diameter (D3), wherein said third diameter (D3) is less than said first diameter (D1) and said third diameter (D3) is greater than said second diameter (D2); and an aperture defined by said protrusion in fluid communication with said aspiration lumen , wherein said protrusion reinforces an area surrounding the aperture . a protrusion on said shaft and positioned between said distal end and said proximal end with said protrusion being positioned distal to said vibration conversion mechanism along said longitudinal axis , a portion of said protrusion having a third diameter (D3), wherein said third diameter (D3) is less than said first diameter (D1) and said third diameter (D3) is greater than said second diameter (D2); and an aperture defined by said protrusion in fluid communication with said aspiration lumen , wherein said protrusion reinforces an area surrounding the aperture . <EOS>