An assembly of a hub, biased valve and catheter is provided for insertion therethrough with a hub and attached needle. The hub, valve and catheter assembly defines an exit bore which is sealed at its entrance by the valve when biased into its normally closed position. When the needle is inserted into...http://www.google.de/patents/US5098394?utm_source=gb-gplus-sharePatent US5098394 - Biased shut off valve assembly for needle and catheter
