| 摘要 |
<p>Throw-away syringe, of the type constituted by a cylindrical tubular body (1) in which a stopper (2) can be displaced in the direction of its axis, the displacement being controlled by a manually actuated stem (3). A second stopper (4) carrying a blade (6) placed in an adequate setting of said stopper (4) is fitted freely in the syringe, between the stopper (2) associated to the stem (3) and the discharge end (5) of the tubular body (11). The blade (6) is inoperative during the backward movement of the stopper (4) and operative to make a mark or incision in the advance direction, a mark through which the inner pressure of the cylindrical body is equalled to the atmospheric pressure to prevent sucking out and therefore re-using the syringe after its first use. <IMAGE></p> |
