Needle-bearing medical devices are provided for fluid infusion, fluid transfusion, and inserting a guide wire. After use the needle is shielded to render the contaminated needle safe to prevent inadvertent needle sticks. The device includes a housing and a needle having a sharpened tip. A biasing element...http://www.google.com.au/patents/US6786875?utm_source=gb-gplus-sharePatent US6786875 - Medical device with shield having a retractable needle
