A surgical handpiece having two coaxial tubes or channels mounted within a body. The first tube is used for aspiration and is smaller in diameter than the second tube so as to create an annular passage between the first and second tube. The annular passage communicates with a pumping chamber formed between...http://www.google.fr/patents/US6179805?utm_source=gb-gplus-shareBrevet US6179805 - Liquefracture handpiece
