An embodiment of the invention includes an entry needle. The entry needle may include a cannula, a needle extending within a lumen of the cannula, and a hub operatively associated with a proximal portion of the cannula. The hub may include a branch in communication with the lumen of the cannula. The...http://www.google.es/patents/US7766878?utm_source=gb-gplus-sharePatente US7766878 - Entry needle and related method of use
