Abstract: This invention relates to a size-specific tubing connector assembly used for selectively connecting tubing segments of various inner diameters. A central housing defines at least one through bore between at least first and second ends configured for axial removable engagement with at least a first pair of a plurality of tubular fitments. Each fitment of the at least first pair defines a common inner and outer diameter and is configured for axial alignment in opposition with one another about the housing in series relation to define fitment series “A” and “B” at respective ends of the housing, with the fitments of each series “A” and “B” arranged preferably in a descending order of the respective fitment's outer diameter.

Abstract: This invention relates to an apparatus and method for the dilation of a blood vessel and subcutaneous tissue that eliminates or minimizes a successive and repetitive insertion and removal of multiple, individual dilators necessary to achieve a target dilation. The dilator preferably defines radiopaque markers to make them visible to a medical practitioner via fluoroscopy. A hydrophilic coating is optionally located on the dilator to reduce surface friction and enhance lubricity between the dilator and vessel and/or subcutaneous tissue.