Apparatus for providing passive protection against accidental needle-stick for a hypodermic needle extending from a hub. There is a tip protector comprising a cross-piece disposed transverse to the needle having an elongated first bore therethrough through which the needle passes and having a bell-shaped...http://www.google.es/patents/US5486164?utm_source=gb-gplus-sharePatente US5486164 - Passive protector for hypodermic needles
