Modular systems comprising a cannula and at least one clip-on access port adjacent to a distal end of the cannula to provide insertion of one or more therapeutic or diagnostic devices into a vessel or cardiac tissue through a single incision site. The access port can be removably attached to a distal...http://www.google.co.uk/patents/US6679872?utm_source=gb-gplus-sharePatent US6679872 - Clip-on access port and method of use
