A syringe is disclosed which includes a needle body having a proximal end and a distal end, a needle attached to the distal end of the needle body, a plunger for drawing fluid into the needle body through the needle, and a protective sheath configured and dimensioned to be positioned about the needle...http://www.google.es/patents/US5531706?utm_source=gb-gplus-sharePatente US5531706 - Safety syringe
