| 摘要 |
A syringe assembly is comprised of a plunger (12), a syringe barrel (14) having a cannula collar (34) at one end of the barrel and an interior chamber (36) within the barrel, a hollow cannula (38) secured within the syringe barrel collar (34) with the cannula (38) extending axially from the collar to its distal end, a bore (52) extending axially through the cannula (38) and the syringe barrel collar (34), a segment of the bore decreasing (e.g., tapering) in diameter as it extends in a direction from the proximal end (42) of the cannula (38) toward the barrel interior chamber (36), and a sheath (16) removably attached to the syringe barrel (14) and covering the cannula (38), the sheath (16) being affixed to a center rod (68) extending axially from the sheath into the bore (52) at the cannula proximal end and then sealing engagement with said segment of the interior bore (52).
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