Structure for facilitating the insertion and placement of medical apparatus into the body of a patient is disclosed which comprises a guide wire having a lumen sized to adapt about the elongated structure of needle-like means. In use, the distal end of the guide wire is placed about the needle-like means...http://www.google.fr/patents/US5209735?utm_source=gb-gplus-shareBrevet US5209735 - External guide wire and enlargement means
