| 摘要 |
<p>A restricted use syringe which allows two aspirating strokes and two discharge strokes. Within the barrel a piston is movable by a plunger rod. The plunger rod has blocks of non-return elements separated by a portion without non-return elements. On the plunger rod is a locking member with a non-return member which engages the side wall of the barrel and the non-return elements on the plunger rod. The alternating blocks and non-return elements interact with the locking member to allow two aspirating strokes and two discharge strokes, so the syringe can be used to administer lyophilised vaccines, but thereafter to be non re-usable. A stroke limiter device suitable for use with the syringe is also disclosed.</p> |
