An irrigation-aspiration device includes an outer cannula and an inner cannula reciprocatable within the outer cannula. Irrigating fluid is flowable between the inner and outer cannula. The inner cannula is bent along the length thereof and springy so as to be biased near an outer end thereof against...http://www.google.co.uk/patents/US4655743?utm_source=gb-gplus-sharePatent US4655743 - Frog aspirator
