One end of a hollow cylindrical tube is attached to a tubing positionable in a patient's body. A radial flange on the tube supports a collar in abutting relationship to one flange surface. Lugs extend integrally from the collar through the flange for disposition against the opposite flange surface. The...http://www.google.com/patents/US5485853?utm_source=gb-gplus-sharePatent US5485853 - Apparatus for withdrawing fluid or tissue from a patient's body
