Needle protectors for housing used blood collection needles are disclosed. The needle protectors are single-piece protectors that include an open distal end for receiving a needle hub (with needle mounted thereon). A retaining member locks the hub when the needle hub is fully retracted. A viewing slot...http://www.google.de/patents/US7566327?utm_source=gb-gplus-sharePatent US7566327 - Needle protector
