A phaco-emulsification needle is provided for use with a plastic or elastomeric sleeve, the needle having a mid-region portion defining a plurality of outwardly extending projections forming longitudinally-oriented grooves that provide adequate irrigant flow rates to the anterior chamber of the eye,...http://www.google.co.uk/patents/US5935096?utm_source=gb-gplus-sharePatent US5935096 - Grooved phaco-emulsification needle
