A blood collecting needle includes a hub having a hole axially formed therein, a needle tube inserted into the hole of the hub and having a sharp edge on each of the distal end and the proximal end of the needle tube, which respectively project from the hub, and a resilient cap mounted airtightly on...http://www.google.fr/patents/US7147608?utm_source=gb-gplus-shareBrevet US7147608 - Blood collecting needle
