| 摘要 |
<p>A syringe for producing controlled vacuum suction for medical purpose, particularly for suctional puncture cytological studies, and optionally standard fluid injection functions like conventional syringes, of the general type comprising a cylinder (1) finishing at the front end in a suction and/or injection tube (2) designed for taking a corresponding needle, and inside the cylinder a plunger (3) which, when it is displaced in the cylinder on the up stroke, produces a vacuum, wherein the cylinder and the plunger stem (5) are provided with supplementary means (6, 8) for mutual locking designed for simple, swift anchoring of this stem in respect of the cylinder so as to maintain a desired vacuum by preventing the plunger to move back to the front end of the cylinder while carrying out vacuum suction, said locking being simply releasable, at the user's discretion, so that the plunger returns to its initial position and cancels the vacuum.</p> |
