| 摘要 |
<p>A disposable auto-destruct syringe is disclosed which includes a syringe barrel for holding an injectable fluid, a piston reciprocatable in the barrel and sealingly engaging the barrel wall, a plunger having a forward portion normally positioned in the barrel and a rearward portion to be manipulated by a user of the syringe, a coupling mechanism for connecting the piston with the plunger to permit axial movement of the piston in the barrel by operation of the plunger, and a deforming structure for permanently deforming the barrel wall to break the seal between the piston and the barrel wall. The deforming structure is in the form of cutters or burrowing elements mounted by way of elastic arms to one of the piston and the plunger. The deforming structure is movable from an at rest position wherein the barrel wall is not deformed, to a barrel wall engaging position wherein the barrel wall is permanently deformed by the deforming structure. The syringe further includes an engaging mechanism for forcing the deforming structure into the barrel wall engaging position upon rearward movement of the piston after a full or partial injection stroke only. The engaging mechanism is mounted to the other of the piston and plunger. This construction provides for an auto-destruct syringe wherein the barrel wall is permanently deformed not during the injection stroke, but only when refilling of the syringe is attempted after a full or partial injection stroke so that the auto-destruction action does no longer interfere with the injection stroke.</p> |
