An ultrasonic cone and method of construction for the emulsification of cataract lenses employed in a hand-held surgical aspirator having an angle of incidence .theta. equal to or less than thirty degrees, the angle of incidence being located at the point of tangency of a transition radius construction...http://www.google.fr/patents/US4869715?utm_source=gb-gplus-shareBrevet US4869715 - Ultrasonic cone and method of construction
