An introducer having an elongate tubular member and a device connector releasably attached to a proximal end of the tubular member. The introducer allows exchange of medical instruments, such as a blood filter and cardioplegia catheter, through a single lumen. An obturator having a retractable blade...http://www.google.co.uk/patents/US6666846?utm_source=gb-gplus-sharePatent US6666846 - Medical device introducer and obturator and methods of use
