| 摘要 |
An improved syringe apparatus (10) in which the plunger tip is fabricated as a unitary part of the plunger (22). The plunger tip (26) is provided with two contact members (28, 30) in contact with the cylindrical bore wall (16) of the syringe barrel (12). The first contact member (28) is provided by a circular rim which is bowl shaped and which projects forwardly at the end of the plunger (22). The second contact member (30) is provided by a circular ring located slightly behind the first sealing member (28). The entire plunger (22), including both contact members (28, 30), are preferably fabricated as a unitary structure from, for example, polypropylene or other material which is relatively resistant to degradation due to chemicals stored over prolonged periods of time in the syringe barrel (12).
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