Patent ID: 8517983

Claim:
A dual chamber combined container-syringe comprising: an outer casing which forms a cylinder shape around an axis, and has a bypass portion formed by an outward bulging of a part of an inner peripheral surface; a hub lure lock provided in a tip of the outer casing; a finger grip provided in a rear end of the outer casing; a front stopper that is fitted to a tip side of the bypass portion in the outer casing; a middle stopper that is fitted to a rear end side of the bypass portion in the outer casing and seals a pharmaceutical preparation into a first section of the outer casing together with the front stopper; an end stopper that is fitted to a rear end side of the middle stopper in the outer casing and seals a liquid medicine into a second section of the outer casing together with the middle stopper; and a plunger rod that is inserted into the finger grip and is connected to the end stopper from a rear end side of the end stopper, wherein an inner peripheral surface of the finger grip is formed with a female screw portion that is twisted around the axis, and an outer peripheral surface of the plunger rod is formed with a first male screw portion that is capable of being screwed into the female screw portion, when a part of the middle stopper, which is moved forward, enters the bypass portion by pushing the plunger rod, a tip of the first male screw portion comes into contact with a rear end of the female screw portion, after the tip of the first male screw portion comes into contact with the rear end of the female screw portion, the first male screw portion is screwed into the female screw portion by moving the middle stopper forward while rotating the plunger rod with respect to the finger grip; before the middle stopper completely enters the bypass portion by further moving the middle stopper forward by rotating the plunger rod with respect to the finger grip, the screwing of the first male screw portion into the female screw portion is released; a guide groove is formed in the female screw portion of the finger grip, the guide groove being extended parallel to the axis; a first guide plate is formed on the outer peripheral surface of the plunger rod at a position further to a rear end side of the plunger rod than the first male screw portion, the first guide plate being guided along the guide groove; a first protrusion is formed in a rear end of the finger grip, the first protrusion coming into contact with the first guide plate so that the first guide plate climbs over the first protrusion when the first male screw portion is screwed into the female screw portion; after the first guide plate moves over the first protrusion, the screwing of the first male screw portion into the female screw portion is released; and a second protrusion is formed in the rear end of the finger grip, the second protrusion coming into contact with the first guide plate which has climbed over the first protrusion in a position where the first guide plate is fitted into the guide groove.