A needle-bearing medical device is provided for 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 biases the needle toward a position...http://www.google.ca/patents/US6398743?utm_source=gb-gplus-sharePatent US6398743 - Medical device for inserting a guide wire having a retractable needle
