| 摘要 |
A pre-filled syringe includes: a cylindrical container, a front end-side gasket; a rear end-side gasket; an intermediate gasket partitioning an inside of the cylindrical container into a front chamber and a rear chamber; a plunger; a medical drug contained in the front chamber, and a liquid drug contained in the rear chamber. In the state where the plunger is pushed in, a bypass portion included in the cylindrical container faces a groove portion provided in the intermediate gasket, thereby allowing communication between the front chamber and the rear chamber therethrough, so that the medical drug and the liquid drug are mixed, and a liquid mixture is discharged. The pre-filled syringe further includes a movement limiting mechanism for limiting movement of the plunger such that a tail end of the rear end-side gasket does not reach the bypass portion. |
| 主权项 |
1. A pre-filled syringe comprising:
a cylindrical container having a front end provided with a discharge path and a rear end provided with an opening; a front end-side gasket provided at a position closer to the front end of the cylindrical container so as to partition a space inside the cylindrical container, the front end-side gasket being freely slidable inside the cylindrical container; a rear end-side gasket provided at a position closer to the rear end of the cylindrical container so as to partition the space inside the cylindrical container, the rear end-side gasket being freely slidable inside the cylindrical container; an intermediate gasket provided inside the cylindrical container so as to partition, into a front chamber and a rear chamber, a portion of the space inside the cylindrical container that is located between the front end-side gasket and the rear end-side gasket, the intermediate gasket being freely slidable inside the cylindrical container; a plunger, a part of which being inserted through the opening into the cylindrical container such that the plunger is connected to the rear end-side gasket, thereby allowing the rear end-side gasket to be pushed toward the front end of the cylindrical container; a medical drug contained in the front chamber; and a liquid drug contained in the rear chamber, wherein the cylindrical container has a bypass portion protruding in a radially outward direction, the intermediate gasket has an outer circumferential surface provided with a groove portion that faces the bypass portion in a state where the intermediate gasket is disposed to face the bypass portion, in a state where the plunger is not pushed in, the bypass portion faces the front chamber and does not face the groove portion, thereby allowing the front chamber and the rear chamber to be maintained in a liquid-tight state by the intermediate gasket, and the front chamber does not communicate with the discharge path, thereby allowing the front chamber and the discharge path to be maintained in a liquid-tight state by the front end-side gasket, in a state where the plunger is pushed in, the rear end-side gasket, the intermediate gasket and the front end-side gasket move toward the front end of the cylindrical container, to cause the bypass portion to face the groove portion, thereby allowing communication between the front chamber and the rear chamber through the bypass portion and the groove portion, to mix the medical drug and the liquid drug so as to prepare a liquid mixture, and allowing communication between the front chamber and the discharge path, to cause the liquid mixture to be discharged through the discharge path to outside, and the pre-filled syringe further comprises a movement limiting mechanism for limiting movement of the plunger such that a tail end of the rear end-side gasket located closer to the plunger is prevented from reaching the bypass portion in the state where the plunger is pushed in. |
