A combination of an introducer cannula and a removable reducer for use therewith. The introducer cannula comprises an elongate tubular member having proximal and distal extremities and having a flow passage extending therethrough. A housing is mounted on the distal extremity and has a chamber in communication...http://www.google.se/patents/US5439455?utm_source=gb-gplus-sharePatent US5439455 - Combination introducer cannula and reducer for use therein
