| 摘要 |
<p>A single use syringe is disclosed having a leading end, a trailing end and a longitudinal axis. The syringe comprises a longitudinally extending hollow barrel, a plunger having a stem, a head and a needle tip. The head being longitudinally displaceable within the barrel. The stem having a first engagement formation and the head having a shoulder defining a second engagement formation. A locking bush is longitudinally fixed within the barrel, the bush having an aperture adapted to receive the stem, permitting the stem to slide longitudinally relative to the bush. The bush has a third engagement formation, and the bush also has an abutment surface defining a fourth engagement formation. The plunger is longitudinally displaceable in a retraction direction away from the leading end to a captive position in which the first engagement formation captively engages the third engagement formation thereby preventing the stem from being longitudinally displaced in an insertion direction toward the leading end from the captive position. The fourth engagement formation is engageable with the second engagement formation if an attempt is made to longitudinally displace the stem in the retraction direction from the captive position.</p> |
