| 摘要 |
A two-component medication syringe (20) with vein indication test capacity includes a barrel (21) having a chamber (44) for retaining fluid and a tip (24) extending from a distal end of the barrel (21) having a passageway therethrough communicating with the chamber (45). The syringe tip (24) is adapted to accept a hypodermic needle. A by-pass stopper (31) is slidably positioned in fluid-tight engagement inside the barrel (21). The barrel (21) also includes a raised peripheral portion (34) serving as a by-pass and defining a by-pass zone. The by-pass zone (34) is longer along the longitudinal axis of the barrel (21) than the length of the by-pass stopper (31) along the longitudinal axis of the barrel (21). The by-pass (34) is positioned so that when the by-pass stopper (31) is within by-pass zone (34), the volume defined within the chamber (45) between the by-pass stopper (31) and the distal end of the barrel (21) is approximately the volume of the combined components of the medication. Further, the by-pass (34) is raised enough to allow fluid to flow around the by-pass stopper (31) when the by-pass stopper (31) is positioned within the by-pass zone (34). Also included is a stopper (36) slidably positioned in fluid-tight engagement inside the barrel (21). This stopper (36) is adapted to engage a plunger rod (37) to facilitate its operation. |
