An IV catheter device (10a) comprising a housing (100, 200)defining a chamber, a seal member (300) positioned within the chamber, the seal member including sealing portion which is positioned to engage a seating surface within the housing to seal a proximal portion of the chamber from a distal portion of the chamber, a locking member (400) positioned within the chamber of the housing, the locking member being positioned about and engaging the seal member to position the sealing portion of the seal member in engagement with the seating surface, the locking member including at least one channel connecting a proximal portion of the chamber to a distal portion of the chamber wherein when the sealing portion of the seal member is moved from engagement with the seating surface within the housing, fluid can flow about the sealing member and through the at least one channel to the distal portion of the chamber.
