In an embodiment, a slit valve catheter has a generally tubular catheter body with an exterior surface exposed to an environment and an interior surface defining a lumen. The catheter further includes a valve which has a protuberance projecting radially from the catheter body....http://www.google.ca/patents/US6120483?utm_source=gb-gplus-sharePatent US6120483 - Medical fluid infusion and aspiration
