The tubular body is preferably constructed of a sufficiently small outside diameter, e.g., 8F (French) and somewhat flexible material, such as polyethylene or polyvinyl chloride, to enable it to be inserted through the introducer sheath 26 into the artery 24, with the tubular body's outlet 36 within the artery 24 distally of the incision of puncture 28 as will be described later.