A needle tip protective device for use with percutaneous entry needles. In one embodiment, the needle tip protective device includes a needle guard slidably mounted on a hypodermic needle, the latter having a needle tip located at the distal end thereof, and a change of profile formed medially there...http://www.google.de/patents/US7534231?utm_source=gb-gplus-sharePatent US7534231 - Needle tip guard for percutaneous entry needles
