A catheter introducing system includes an introducer catheter comprising a flexible sheath having a hemostasis valve and an obturator having a steering mechanism operated by a proximal actuator handle. The catheter introducer system will usually be introduced with the obturator inside of the flexible...http://www.google.co.uk/patents/US5599305?utm_source=gb-gplus-sharePatent US5599305 - Large-diameter introducer sheath having hemostasis valve and removable steering mechanism
