| 摘要 |
A syringe for medical administration of liquids, for example medicaments, is disclosed. The injection pump has an injection cylinder (1), comprising an administration opening, a plunger opening and an axially displaceable plunger (2) arranged within said cylinder. The forward end of the plunger (2) forms a piston (3) with a seal against the inner surface (4) of the injection cylinder. The rearmost part of the plunger (2), which projects from the plunger opening, terminates in a grip-section (6). The maximum length of withdrawal (Amax) of the plunger is limited by the retraction of a perceptible mechanical resistance element (14). In order to achieve a permanent contamination protection and to be able to recycle the injection pump, a supplementary seal (10), which is just as effective as the piston seals (12, 13) around its entire circumference, between the outer surface of the plunger (2) and the inner surface (4) of the injection cylinder (1) is disclosed. The axial separation (AK) between the furthest forward sealing-line of the supplementary seal (10) and the furthest backward sealing-point of the piston (3) is greater than the greatest possible axial displacement of the plunger until the maximum length of withdrawal (Amax) is achieved. |
