Patent ID: 8276581

Claim:
A prefilled type nasal drip appliance comprising: a syringe barrel provided with a spray hole of a medicinal solution on one side and a medical solution storage part that stores the medicinal solution in advance on the other side; an elastic piston that is inserted into the syringe barrel in a slidable manner to the inner circumferential face of the syringe barrel; a plunger that is attached to the rear end of the piston and that enables the piston to be moved in a direction of an axis of the syringe barrel; and an elastic center stopper that is inserted into the syringe barrel in such a manner that the center stopper is located between the spray hole and the piston and that can slide on the inner circumferential face of the syringe barrel, wherein the medicinal solution is stored between the center stopper and the piston in a liquid-tight state in advance, the syringe barrel is provided with a center stopper locking part between the spray hole formed on one side and the center stopper, a conduction part that is a passage way that can introduce the medicinal solution is formed at one location or a plurality of locations in the center stopper locking part, a syringe barrel side protruding part that is protruded inside from the inner circumferential face of the syringe barrel is formed on the other end side of the syringe barrel, the plunger is provided with a plunger side protruding part that is protruded outside from the outer circumferential face of the plunger is formed at a generally central part in a direction of an axis of the plunger, the syringe barrel side protruding part and the plunger side protruding part are configured to be engaged with each other and the engagement is configured to be released with a pressure of a predetermined level or more when the plunger is moved in a direction of the spray hole of the syringe barrel and the plunger side protruding part gets over the syringe barrel side protruding part, a pressure of a predetermined level or more is applied to the plunger, the plunger is moved in a direction of the spray hole of the syringe barrel, the engagement of the plunger side protruding part and the syringe barrel side protruding part is released, the medicinal solution moves the center stopper in a direction of the spray hole by the pressure that is applied to the plunger in the release of the engagement, the center stopper gets over the conduction part that is formed to the center stopper locking part, a medical solution inflow groove is formed between the conduction part and the center stopper, the medical solution storage part and the spray hole are interconnected with each other, and the medicinal solution is therefore flown and moved in a direction of the spray hole from the medical solution inflow groove, whereby the medicinal solution can be sprayed from the spray hole.