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A two-compartment type prefilled syringe includes a first rubber stopper fitted into a front sleeve, a second rubber stopper fitted into a rear end portion of a cartridge, a third rubber stopper for hermetically dividing the interior of the cartridge into front and rear compartments and a bypass for

A two-compartment type prefilled syringe includes a first rubber stopper fitted into a front sleeve, a second rubber stopper fitted into a rear end portion of a cartridge, a third rubber stopper for hermetically dividing the interior of the cartridge into front and rear compartments and a bypass formed by radially outwardly bulging a portion of a peripheral wall of the cartridge. In an axial direction of the cartridge, a length of the third rubber stopper is slightly smaller than an inner length of the bypass. When the third rubber stopper has been displaced into the bypass, the sealing property of the rear compartment with the front compartment is cancelled such that the dissolving agent, suspension or the like in the rear compartment is carried, via the bypass, into the front compartment containing dry medicament or the like. A ratio of a maximum width of one end of the bypass adjacent to the front sleeve to a maximum width of the other end of the bypass adjacent to the rear end portion of the cartridge is set to range from 1.2 to 5.0.

대표청구항 ▼

[ What is claimed is:] [1.] A two-compartment type prefilled syringe comprising:a cartridge;a front sleeve which is mounted on a front end portion of the cartridge and has an injection needle mounted thereon;a first rubber stopper which is fitted into the front sleeve and is pierced through by the i

[ What is claimed is:] [1.] A two-compartment type prefilled syringe comprising:a cartridge;a front sleeve which is mounted on a front end portion of the cartridge and has an injection needle mounted thereon;a first rubber stopper which is fitted into the front sleeve and is pierced through by the injection needle prior to use of the prefilled syringe;a second rubber stopper which is fitted into a rear end portion of the cartridge;a plunger rod which is attached to the second rubber stopper;a third rubber stopper which is fitted into the cartridge so as to be disposed between the first rubber stopper and the second rubber stopper such that an interior of the cartridge is hermetically divided into a front compartment defined between the first rubber stopper and the third rubber stopper and a rear compartment defined between the third rubber stopper and the second rubber stopper; anda bypass comprising a radially outwardly bulging portion of a peripheral wall of the cartridge disposed between the first rubber stopper and the third rubber stopper;wherein in an axial direction of the cartridge, a length of the third rubber stopper is slightly smaller than an inner length of the bypass;wherein when the third rubber stopper has been displaced into the bypass, a sealing property of the rear compartment with respect to the front compartment is cancelled such that a dissolving agent, suspension or the like in the rear compartment is carried, via the bypass, into the front compartment containing dry medicament or the like; andwherein a ratio of a maximum width of one end of the bypass adjacent to the front sleeve to a maximum width of the other end of the bypass adjacent to the rear end portion of the cartridge is set to range from 1.2 to 5.0.