A cannula device has a hollow needle, and a hub which supports the hollow needle at the proximal end portion thereof and which is made of a hard plastic. A protector comprises a hollow body whose distal end is closed and whose proximal end is open and which is made of a hard plastic. The protector is...http://www.google.fr/patents/US4551138?utm_source=gb-gplus-shareBrevet US4551138 - Cannula device and medical bag having the same
