JPH067741U - Drug dispenser - Google Patents

Abstract

(57) [Summary] [Purpose] The reset switch does not operate during dispensing, and the displayed value and the actual dispensing amount correspond accurately,
(EN) Provided is a drug quantitative dispenser capable of reliably dispensing a set drug amount. [Structure] A drug quantitative dispensing device 1 comprises a cylindrical main body 2 having an open rear end, a first plunger 11 for pressing a piston of a drug cartridge, and a second plunger for moving a first plunger in a distal direction. A plunger 8, a third plunger 9 attached to the rear part of the second plunger and having a reset switch pressing portion 9a, a drug dose setting member 26 for rotating the third plunger, and a drug dose display Part 2
1, a stopper 10 that locks the movement of the second plunger in the distal direction, and a stopper 10 that is provided a predetermined distance from the position of the reset switch pressing portion when the second plunger is locked by the stopper. A reset switch 33 for resetting the display on the display section is provided, and the reset switch is provided at a position where it contacts the reset switch pressing section after the second plunger is locked by the stopper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drug quantitative dispensing device capable of reliably setting and dispensing a drug amount filled in a cartridge by a simple operation.

[0002]

[Prior art]

 Conventionally, a syringe has been used to dispense a liquid drug in a fixed amount. An example of this type of injector is an insulin injector for injecting insulin, which is a liquid drug for the treatment of diabetes. And if diabetic patients need to administer insulin several times a day, they must always carry a syringe and ampoule of drug, which is inconvenient to carry. There was also a sense of anxiety that others would know that they had diabetes. In addition, when replenishing the drug from the ampoule bottle to the injector, it is necessary to puncture the rubber part of the ampoule bottle once, but at this time, the needle tip of the injection needle is damaged or the puncture resistance increases. There was also a risk that the patient was physically and mentally burdened considerably. Therefore, a portable pen-type puncture metering / dispensing device has been proposed which can dispense an arbitrary amount of the medicine filled in the cartridge and can easily confirm the dispensed amount by a digital display.

[0003]

[Problems to be solved by the device]

 However, in the conventional dispensing type digital display type pen-type fixed amount dispenser, there is a risk that the reset switch for resetting the digital display may be actuated during the dispensing, so There was a problem that the actual amount of dispensing did not correspond accurately near the origin (point where the digital display was 0). Therefore, the user may see the reset display (zero display) and finish the administration work before the dispensing of the set amount is completed.

The object of the present invention was made in view of the above-mentioned problems, and the reset switch does not operate during the dispensing, and the digital display value and the actual dispensing amount are Accurately responds to the origin, and is to provide a fixed-quantity drug dispenser capable of reliably dispensing a set drug amount.

[0005]

[Means for Solving the Problems]

 What achieves the above-mentioned object is to have a drug cartridge mounting portion for mounting a drug cartridge having a drug and a slidable piston, a cylindrical main body having a rear end opened, and a cylindrical main body housed in the cylindrical main body. And a first plunger for pressing the piston of the medicine cartridge, which has a screw portion, and a screw portion that is screwed with the screw portion of the first plunger, and the tubular shape is obtained by the screw engagement. A second plunger, which is rotatably and slidably provided in the main body, for moving the first plunger in the distal direction, and a reset switch pressing portion attached to the rear portion of the second plunger. A third plunger having a rear end portion protruding from the rear end opening of the tubular body, and the third plunger slidably inserted therein and sliding on the rear end of the tubular body. Immobile and rotatable The attached medicine dose setting member for rotating the third plunger and the attached rotation amount or movement distance of the third plunger are detected. A drug dispensing amount calculation unit that calculates the drug dispensing amount when the end portion is pressed, a display unit that displays the drug dispensing amount calculated by the drug dispensing amount calculation unit, and the second plunger A stopper for locking the movement from the predetermined position toward the front end, and a stopper provided at the front end for a predetermined distance from the position of the reset switch pressing portion when the second plunger is locked by the stopper. And a reset switch for resetting the display on the display unit, the reset switch including the reset switch of the third plunger after the second plunger is locked by the stopper. That is provided at a position in contact with the pressing portion is an agent quantitative dispenser to feature.

It is preferable that the tubular main body has a second stopper that locks the movement of the third plunger in a rear end direction from a predetermined position. The second stopper has a convex portion or a concave portion that locks rotation for moving toward the rear end direction of the third plunger, and the third plunger has the convex portion of the second stopper. Alternatively, it preferably has a concave portion or a convex portion that engages with the concave portion. Further, it is preferable that the tubular main body has a third stopper that locks the movement of the first plunger in the rear end direction. The first plunger has a slit extending in the axial direction, the third stopper is inserted into the slit of the first plunger, and the protrusion that locks the rotation of the first plunger. It is preferable to have Furthermore, it is preferable that the tubular main body has a cartridge receiver for abutting the rear end of the drug cartridge. The first plunger has a slit extending in the axial direction, and the cartridge receiver has a convex portion that is inserted into the slit of the first plunger and locks the rotation of the first plunger. It is preferable to have. Further, the rear end opening of the tubular body has a plurality of recesses or protrusions projecting toward the center, and the drug-dispensing amount setting member has protrusions or recesses that engage with the recesses or protrusions. It is preferable that the rear end opening of the tubular main body and the drug-dispensing-amount setting member form a click mechanism by the concave portion or the convex portion and the convex portion or the concave portion. Further, the rear end surface of the tubular body has a plurality of protrusions or recesses, and the drug-dispensing-amount setting member has the protrusions or recesses on the contact surface with the rear end face of the tubular body. It is preferable to have a concave portion or a convex portion that engages.

Further, the stopper has a convex portion or a concave portion that locks rotation for moving in the distal direction of the second plunger, and the second plunger has the convex portion or the concave portion of the stopper. It is preferable to have a concave portion or a convex portion that engages with. Furthermore, the third plunger has a plurality of recesses or protrusions that extend in the axial direction, and the drug-dispensing amount setting member is a second protrusion or recess that engages with the recesses or protrusions. It is preferable to have The engagement between the concave portion or the convex portion of the third plunger and the second convex portion or the concave portion of the medicine dosage setting member is the second provided on the medicine dosage setting member. When the convex portion or the convex portion of the concave portion is pressed in the central direction by the concave portion or the convex portion of the convex portion provided in the rear end opening of the cylindrical main body, a slight gap is provided so that the convex portion or the concave portion can move in the central direction. It is preferable that it is engaged with.

Further, it is preferable that a first spring that biases the third plunger toward the rear end is attached to an engaging portion of the second plunger and the third plunger. Further, the rear end portion of the third plunger has a plunger pressing portion, and the engaging portion between the plunger pressing portion and the medicine dispensing amount setting member has the medicine dispensing amount setting It is preferable that a second spring for urging the member toward the distal end is attached. Further, it is preferable that a third spring for urging the cartridge receiver in the tip direction is attached between the third stopper and the cartridge receiver. Further, it is preferable that the tubular main body has a cartridge holder having the drug cartridge mounting portion detachably attached to a tip end portion thereof. Further, the drug quantitative dispensing device is configured such that the first concavo-convex portion of the first plunger and the second concavo-convex portion of the third stopper are occluded, and the threaded portion of the first plunger and the It is preferable to have a mechanism for releasing the screw engagement with the screw part of the two plungers.

Therefore, the drug quantitative dispensing device of the present invention will be described with reference to an embodiment shown in the drawings. The drug-dispensing dispenser 1 of the present invention has a drug cartridge mounting portion 14 for mounting a drug cartridge 22 having a drug S and a slidable piston P, and a cylindrical main body 2 having an open rear end, A first plunger 11 that is housed in the cylindrical main body 2 and that has a threaded portion 11a for pressing the piston P of the drug cartridge 22 and a threaded portion that is screwed into the threaded portion 11a of the first plunger 11. A second plunger 8 for moving the first plunger 11 toward the distal end, which is provided rotatably and slidably in the tubular main body 2 by having the screw 8a. The third plunger 9 is attached to the rear portion of the jar 8 and has a reset switch pressing portion 9a, and the rear end portion protrudes from the rear end opening of the cylindrical main body 2, and the third plunger 9 is slid inside. Movably, and Of the medicine dose setting member 26 for rotating the third plunger 9, which is non-slidably and rotatably attached to the rear end of the main body 2, and detects the rotation amount or movement distance of the third plunger 9. Then, based on the detected value, the drug dispensing amount calculating unit 20 for calculating the drug dispensing amount when the rear end portion of the third plunger 9 is pressed, and the drug dispensing amount calculated by the drug dispensing amount calculating unit 20. A display portion 21 for displaying a dosage, a stopper 10 for locking the movement of the second plunger 8 from a predetermined position toward the tip end, and a reset switch pressing when the second plunger is locked by the stopper 10. And a reset switch 33 for resetting the display on the display unit 21, which is provided on the tip side of a predetermined distance from the position of the section, and the reset switch 33 has the second plunger 8 locked by the stopper 10. After, Ru drug quantitation dispenser der, characterized in that is provided at a position in contact with the reset switch push pressure portion 9a of the third plunger 9.

Hereinafter, an embodiment of the drug quantitative dispensing device of the present invention will be described with reference to FIGS. 1 to 14. FIG. 1 is a front view of an embodiment of the drug dispenser of the present invention, FIG. 2 is a vertical sectional view of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a cross-sectional view of the medicine dose setting member of FIG. 3 when rotated by a predetermined angle, and FIG. 5 is a partially enlarged cross-sectional view of the vicinity of the rear part of the embodiment of the drug metering and dispensing device of the present invention. 6 is a sectional view taken along line BB of FIG. 5, FIG. 7 is a sectional view taken along line CC of FIG. 5, and FIG. 8 is a sectional view taken along line DD of FIG. FIG. 9 is a sectional view taken along line EE of FIG. 5, FIG. 10 is a sectional view taken along line FF of FIG. 2, and FIG. 11 is a sectional view taken along line GG of FIG. FIG. 12 is a partially enlarged cross-sectional view of a drug metering and dispensing device according to an embodiment of the present invention during cartridge replacement, and FIG. Partial enlarged sectional view of There, FIG. 14 is a block diagram of the electrical circuitry of one embodiment of a drug quantitation dispenser of the present invention.

The drug-dispensing dispenser 1 of the present invention has a drug cartridge mounting portion 14 to which a drug cartridge 22 having a drug S and a slidable piston P is mounted, and a cylindrical body having an open rear end. Have two. And, as shown in FIG. 2, the medicine fixed amount dispenser 1 of this embodiment has a medicine cartridge 22 having a liquid medicine S therein and a slidable piston P for discharging the medicine S. It has an injection needle 15 attached to the tip of the cartridge 22 and inserted through the inside and outside of the cartridge. FIG. 2 shows a state in which a liquid medicine S is filled in the metered-dose dispenser 1 of the present invention, and a transparent medicine cartridge 22 having an injection needle 15 exchangeably attached to the tip is attached. There is. A cap 15a for an injection needle is encapsulated in the injection needle 15 to protect the needle tip of the injection needle 15 and at the same time to prevent danger at the time of disposal after use. A liquid medicine S is filled in the medicine cartridge 22, and a rubber stopper 14d which is pierced by a hollow needle provided at the rear end side of the injection needle 15 is provided at the tip of the cartridge 22. There is. Further, inside the inside of the cartridge 22, there is provided a piston P which is slidable along the inner peripheral surface of the cartridge 22 in the longitudinal direction and in a liquid-tight state, and the piston P advances toward the rubber stopper 14d of the cartridge 22 to It is configured so that S is distributed.

Further, in this embodiment, the cylindrical main body 2 has a cartridge holder 13 which is detachably attached to the tip end thereof, and the cartridge holder 13 has a drug cartridge 22 inside which a drug cartridge 22 is mounted. It has a mounting part 14. The medicine cartridge 22 is replaceably mounted on the medicine cartridge mounting portion 14. Further, as shown in FIG. 2, the cartridge holder 13 has, on the outer peripheral surface of the distal end portion, a mouth screw portion 13b which is screwed with the screw body 15b and holds the injection needle 15, and On the outer peripheral surface on the end side, there is provided a screw portion 13a that is screwed into the tightening screw portion 2a of the tubular body 2. Then, the cartridge holder 13 is gripped, the screw body 15b is loosened, the injection needle 15 with the injection needle cap 15a covered is pulled out from the rubber stopper 14d of the cartridge 22 and taken out, and then the cartridge holder 13 is gripped and rotated. , The screwed state with respect to the main body 2 is released, and the cartridge holder 13 is removed from the main body 2. Further, the cartridge 22 is removed from the cartridge holder 13 and the cartridge 22 is replaced. The drug dispensing device 1 of this embodiment is configured so that the cartridge 22 can be replaced, but it may be a disposable device until the drug in the drug cartridge 22 mounted inside is exhausted. Good. Further, the tubular body 2 has a rear end opened so that a third plunger 9 described later can be projected to the outside.

Further, as shown in FIG. 2 or 5, the drug quantitative dispensing device 1 of the present invention has a stopper 10 for preventing the second plunger from moving from the predetermined position toward the distal end. . The stopper 10 is for locking the second plunger 8 moving in the distal direction at the dispensing completion position during dispensing, and in this embodiment, as shown in FIG. 8, the tubular main body. It is formed by a protrusion extending from the three sides of the inner surface of 2 toward the center. Further, this stopper 10 has a convex portion or a concave portion 10a that locks rotation for moving in the distal direction of the second plunger 8, and the second plunger 8 is provided with a convex portion or a concave portion 10a of the stopper 10. It is preferable to have a concave portion or a convex portion 8b that engages. By engaging these 10a and 8b, the second plunger 8 cannot rotate for moving further in the distal direction, and is securely locked at the position where the stopper 10 is provided. In this embodiment, the stopper 10 has a concave portion, and the second plunger 8 has a convex portion on the contact surface with the stopper 10 that engages with the concave portion.

Further, it is preferable that the tubular main body 2 has a second stopper 31 that prevents the third plunger 9 from moving from the predetermined position toward the rear end. As shown in FIG. 2, the second stopper 31 is provided in the vicinity of the rear portion inside the tubular main body 2, and when setting the dispensing amount, the third plunger 9 (this actual stopper) is moved toward the rear end. In the embodiment, it contacts the rear part of the plunger connector 18 and functions so that the third plunger 9 does not move further to the rear end. Further, as shown in FIG. 9, the second stopper 31 has a convex portion or a concave portion 31a that locks rotation for moving toward the rear end direction of the third plunger 9, and the third plunger 9 is It is preferable to have a concave portion or a convex portion that engages with the convex portion or the concave portion 31a of the second stopper 31. By these engagements, the third plunger 9 cannot be further rotated to move to the rear end direction, and is reliably locked at the position where the second stopper 31 is provided. In this embodiment, the second stopper 31 has a convex portion, and the plunger connector 18 has a concave portion 18a on the contact surface with the second stopper 31 for engaging with the convex portion. ing.

Further, as shown in FIG. 3, the rear end opening of the tubular main body 2 has a plurality of recesses or protrusions 2b protruding in the central direction, and the drug-dispensing-amount setting member 26 described later has a tubular shape. It is preferable to have a convex portion or concave portion 26a that engages with the concave portion or convex portion 2b of the main body 2. Further, it is preferable that the rear end opening of the cylindrical main body 2 and the medicine dose setting member 26 form a click mechanism by the concave portion or the convex portion 2b and the convex portion or the concave portion 26a. In this embodiment, two convex portions are formed as the concave portions or the convex portions 2b as shown in FIG. 3, and four concave portions are formed as the convex portions or the concave portions 26a. Then, by rotating the medicine dosage setting member 26, these are engaged and the medicine dosage setting member is intermittently locked. Further, as shown in FIG. 5, the rear end surface of the tubular main body 2 has a plurality of convex portions or recessed portions 2 c, and a drug dose setting member 26, which will be described later, is formed with the rear end surface of the tubular main body 2. It is preferable that the contact surface has a concave portion or convex portion 26c that engages with the convex portion or concave portion 2c. By engaging these, the click mechanism between the cylindrical body 2 and the medicine dose setting member 26 becomes better together with the action of the second spring 29 described later, and the click feeling is improved. To do.

The drug metered-dose dispenser 1 of the present invention is provided with a first plunger 11 for pressing the piston P of the drug cartridge 22 and a first plunger 11 in the cylindrical body 2. It has a second plunger 8 for moving in the direction, a reset switch pressing portion 9a, and a third plunger 9 having a rear end portion protruding from the rear end opening of the cylindrical main body 2.

The first plunger 11 has a screw portion 11 a that engages with the screw portion 8 a of the second plunger 8. In this embodiment, as shown in FIG. 12, the first plunger 11 is a tubular body having a rear end opened for inserting the second plunger 8 therein, and the screw portion 11a has an inner peripheral surface. It is provided on the surface. Further, the first plunger has a tip portion 11d for pressing the piston P. In addition, the outer surface of the first plunger 11 in this embodiment is provided with a first uneven portion 11b that meshes with a second uneven portion 17b of the third stopper 17 described later. The first concave and convex portion 11b has a vertical cross section of one convex portion in the rear end direction of the cylindrical main body 2 so as to allow independent movement in the rear end direction of the second plunger 8 described later. It is formed to have a sawtooth shape (in other words, a sawtooth shape having an inclined surface which is inclined toward the center side of the first plunger 11 toward the front end direction of the main body 2). As a result, the first plunger 11 moves in the front end direction but does not move in the rear end direction when the first concave-convex portion 11b is engaged with the second concave-convex portion 17b of the third stopper 17. .

Further, as shown in FIG. 2 or FIG. 11, the first plunger 11 in this embodiment has a slit 11c extending axially from the position separated from the rear end by a predetermined distance toward the front end. ing. Therefore, in the first plunger 11, when the first concave-convex portion 11b and the second concave-convex portion 17b of the third stopper are engaged with each other, a biasing force is applied in the central direction, and the screw portion 8a and the screw portion 11b is screwed. On the other hand, when the first concavo-convex portion 11b and the second concavo-convex portion 17b do not occlude, the first plunger 11 is not biased toward the center, so that the screw portion 8a and the screw portion 11b are not urged. The screwing is released, the first plunger 11 and the second plunger 8 are simply in contact with each other, and can freely slide with respect to each other.

As shown in FIG. 2 or 13, the second plunger 8 has a screw portion 8a that is screwed with the screw portion 11a of the first plunger 11, and the inside of the cylindrical main body 2 is screwed by the screw portion 8a. It is provided so that it can rotate and slide. In this embodiment, as shown in FIG. 13, the second plunger 8 is inserted into the inside of the first plunger 11, and the outer peripheral surface of the second plunger 8 is screwed with the screw portion 11a of the first plunger 11. have. Then, when the second plunger 8 is rotated by these screwing, the second plunger 8 moves in the front end direction or the rear end direction independently of the first plunger 11. Then, the amount to be distributed is determined by the moving distance of the second plunger 8 in the axial direction.

The movable distance in the rear end direction of the second plunger 8 is preferably set to be the same as the movable distance in the front end direction of the piston P of the cartridge 22. With this configuration, when the medicine remaining amount in the cartridge 22 is smaller than the dispensing amount to be set, the second plunger 8 does not move to the rear end direction, so that the dispensing amount more than the remaining amount is dispensed. The amount cannot be set, and the small amount of drug is not accidentally dispensed. In this embodiment, as shown in FIG. 12, a step portion 8e is provided at the rear portion of the second plunger 8 at the position where the screw portion 8a is provided, and the second plunger 8 after the step portion 8e is provided. The diameter is small. Then, on the inner peripheral surface near the rear end portion of the first plunger 11, a step portion that contacts the step portion 8e of the second plunger 8 and locks the movement of the second plunger 8 in the rear end direction. 11e is provided. Further, the distance between these step portions when the amount of the drug in the cartridge 22 is full is set to be the same as the movable distance of the piston P of the cartridge 22. Therefore, when setting the drug dispensing amount, even if an attempt is made to set a drug amount more than the remaining amount, these step portions 8e and 11e come into contact with each other, and the second plunger 8 is not moved further toward the rear end. Therefore, there is no need to accidentally dispense a small amount of medicine. Further, by setting in this way, when the second plunger 8 cannot move any more, the display section 21 described later shows the medicine remaining amount, so that the remaining amount can be confirmed before dispensing. Then, the second plunger 8 has an engaging portion with the third plunger 9 at the rear portion.

The third plunger 9 is attached to the rear portion of the second plunger 9, and has a reset switch pressing portion 9a for pressing a reset switch 33, which will be described later, at the front end thereof, as shown in FIG. is doing. Further, the rear end portion of the third plunger 9 projects outward from the rear end opening of the cylindrical main body 2, and the projection portion facilitates pressing of the third plunger 9 during drug dispensing. It is preferable that the plunger pressing portion 9b having an enlarged diameter is provided. Then, the third plunger 9 is attached to the rear portion of the second plunger 8 and moves with the movement of the second plunger 8 in the axial direction. Further, the third plunger 9 can allow the reset switch pressing portion 9a to protrude by a predetermined distance even after the movement of the second plunger 8 in the distal direction is stopped by the stopper 10 described later. It is attached to the rear part of the second plunger 8. In this embodiment, the second plunger 8 and the third plunger 9 are engaged as shown in FIGS. That is, the rear portion of the second plunger 8 has a protrusion formed in a cross shape, and the tip end portion of the third plunger 9 has a cross shape when engaged with the rear portion of the second plunger 8. It has four expanded diameter portions that do not abut the protrusions. Then, as shown in FIG. 5, the second plunger 8 and the third plunger 9 are brought into engagement with each other after the rear portion of the second plunger 8 and the tip portion of the third plunger 9 are engaged with each other. The third plunger 9 is engaged so as not to come off from the rear by an annular plunger connector 18 fixed to the cross-shaped protrusion of No. 8. Specifically, the cross-shaped protrusion of the second plunger 8 has a concave portion at the rear end, and the plunger connector 18 has a convex portion that engages with the concave portion. Is fixed to the protrusion. Then, as shown in FIG. 9, the annular portion of the plunger connector 18 comes into contact with the expanded diameter portion of the third plunger 9 so that the third plunger 9 is prevented from coming off. Since the second plunger 8 and the third plunger 9 are engaged with the cross-shaped protruding portion at the enlarged diameter portion, when the third plunger 9 is rotated, the second plunger 8 is rotated together. To do.

As described above, since the third plunger 9 has the enlarged diameter portion that does not come into contact with the cross-shaped protruding portion of the second plunger 8, the second plunger 8 has the stopper 10. Even after being locked by, the tip of the expanded portion (reset switch pressing portion 9a) projects in the tip direction and presses the reset switch 33. Further, as shown in FIG. 5, a first spring 28 for urging the third plunger 9 toward the rear end is attached inside the engaging portion of the second plunger 8 and the third plunger 9. Is preferably provided. This allows the reset switch pressing portion 9a of the third plunger 9 to project and press the reset switch 33, and then the third plunger 9 can be automatically returned to the rear.

Further, the third plunger 9 is formed so as to rotate with the rotation of a medicine dosage setting member 26 described later. In this embodiment, the third plunger 9 has a concave portion or convex portion 9c that engages with the second convex portion or concave portion 26e of the medicine dosage setting member 26, as shown in FIG. 5 or 9. Both of them are formed so as to rotate together by spline connection. More specifically, in this embodiment, the third plunger 9 is formed with four recesses extending in the axial direction on the outer peripheral surface thereof, and the drug dispensing amount setting member 26 is provided with the recesses. There are four protrusions that engage. The engagement between the concave portion or the convex portion 9c of the third plunger 9 and the second convex portion or the concave portion 26e of the medicine dispensing amount setting member 26 is, as shown in FIG. When the convex portion of the convex portion or the concave portion 26a provided in 26 is pressed in the central direction by the convex portion of the concave portion or the convex portion 2b provided in the rear end opening of the tubular body 2, the convex portion can move in the central direction. It is preferable that they are engaged with each other with a slight gap. As a result, the click mechanism between the tubular body 2 and the medicine dose setting member 26 becomes better, and it can withstand long-term use.

Further, the drug metered-dose dispenser 1 of the present invention may have a third stopper 17 inside the cylindrical body 2 for locking the movement of the first plunger 11 toward the rear end direction. I like it. Specifically, when the third stopper 17 rotates the second plunger 8 and moves it in the rear end direction, the first plunger 11 moves as the second plunger 8 moves in the rear end direction. It functions to prevent movement. Further, the third stopper 17 also has a function of holding the first plunger 11. As a result, it is possible to prevent a difference between the set amount and the dispensing amount due to the first plunger 11 moving toward the rear end during carrying and setting the dispensing amount. In this embodiment, as shown in FIG. 10 or FIG. 13, the third stopper 17 is formed in the shape of a short cylinder, and is formed of two convex portions provided on the inner surface of the cylindrical main body 2. The three stopper fixing portions 24a and 24b are sandwiched and fixed. The third stopper 17 has a backward movement preventing means that allows the first plunger 11 to move in the front end direction and prevents the first plunger 11 from moving in the rear end direction. In this embodiment, as shown in FIG. 13, as a backward movement preventing means, the tongue-shaped portion 17d is occluded on the contact surface with the first plunger 11 and on the first uneven portion 11b of the first plunger 11. The second uneven portion 17b is formed. The second concave-convex portion 17b is formed such that the vertical cross section of one convex portion has a sawtooth shape having a top in the tip direction of the tubular body 2. By forming the third stopper 17 in this way, the second uneven portion 17b of the third stopper 17 meshes with the first uneven portion 11b of the first plunger 11, and the third stopper 17 moves in the distal direction of the first plunger 11. Is allowed, but movement toward the rear end is prevented.

Further, the pitch of the above-mentioned first uneven portion 11b and the second uneven portion 17b is set corresponding to the movement distance of the piston P, and is necessary for dispensing a predetermined amount of medicine. It is set to be the same as the required axial movement distance of the piston P. In this embodiment, the pitch of the first concavo-convex portion 11b is set to be the same as the axial movement distance of the piston P required to dispense the drug of 2 units. The means for preventing the movement of the first plunger 11 toward the rear end direction is not limited to the above-described structure, and for example, the third stopper 17 may be used to slide the first plunger with some resistance. The movable body, for example, an annular rubber member, may prevent the first plunger 11 from moving toward the rear end during carrying and setting of the dosage.

Furthermore, it is preferable that the drug fixed quantity dispenser 1 of the present invention has means for making the first plunger 11 non-rotatable. By providing the means for making the first plunger 11 non-rotatable, it is possible to prevent the second plunger 8 from rotating due to the rotation of the second plunger 8. In this embodiment, as shown in FIG. 10, the first plunger 11 has a slit 11c extending in the axial direction, and the third stopper is inserted into the slit 11c so that the first plunger 11 has It has a convex portion 17c that locks rotation. Further, in this embodiment, as shown in FIG. 11, a cartridge receiver 23 for contacting the rear end of the drug cartridge 22 is provided inside the cylindrical main body 2, and this cartridge receiver 23 is provided. Has a convex portion 23c that is inserted into the slit 11c of the first plunger 11 and locks the rotation of the first plunger 11, thereby preventing the rotation of the first plunger 11.

The rotation preventing means for the first plunger 11 may be any means provided inside the cylindrical body 2 and inserted into the slit 11c to lock the rotation of the first plunger 11. As described above, by attaching to the third stopper 17 and the cartridge receiver 23, the number of parts can be reduced and the manufacture and assembly of parts can be simplified. Further, the rotation preventing means of the first plunger 11 is not limited to the structure of this embodiment, and for example, an annular rubber member for urging the first plunger 11 toward the center thereof is provided, and In order to rotate the jar 11, a certain amount of resistance may be required, or instead of the slit 11c, a laterally long concave portion may be formed, and the convex portion 17c may be inserted and locked. In addition, a convex portion is provided on the first plunger 11 separately from the slit 11c, and the convex portion is inserted into the inner surface of the main body 2 to form a concave portion extending in the axial direction of the main body 2. By engaging these, the first plunger is formed. 11 may be slidable and prevented from rotating.

As described above, the rotation and the movement of the first plunger 11 toward the rear end of the main body 2 are locked by the rotation preventing means, so that the second plunger 8 is screwed with the first plunger 11. The main body 2 moves independently in the axial direction of the main body 2 when the main body 2 is rotated while being engaged and the screwing is advanced or retracted. Specifically, in this embodiment, the second plunger 8 is moved in the rear end direction of the main body 2 by rotating it counterclockwise in the front end direction of the main body 2, and is rotated in the opposite direction in the clockwise direction. To move in the direction of the tip. Then, when the second plunger 8 is moved counterclockwise toward the tip end of the main body 2 in the rear end direction and the plunger pressing portion 9b of the third plunger 9 is pressed, The amount of drug to be dispensed to is determined.

Further, between the third stopper 17 and the cartridge receiving member 23, as shown in FIG. 13, a third spring 30 for urging the cartridge receiving member 23 in the tip direction may be attached. preferable. Thereby, as will be described later, when the cartridge is replaced, the engagement between the first uneven portion 11b of the first plunger 11 and the second uneven portion 17b of the third stopper 17 and the screw of the first plunger 11 A mechanism for releasing the screw engagement between the portion 11a and the screw portion 8a of the second plunger 8 can be configured.

The drug dispenser 1 of the present invention has the third plunger 9 slidably inserted therein and is attached to the rear end of the cylindrical body 2 so as not to be slidable and rotatable. , And has a drug dose setting member 26 for rotating the third plunger 9 to set the drug dose. The medicine dose setting member 26 is provided so that the third plunger 9 is inserted thereinto, and its rear end projects from the opening of the main body, so that it cannot slide in the axial direction with respect to the main body 2. Specifically, in this embodiment, as shown in FIG. 5, the setting member 26 is formed in a tubular shape so that the third plunger 9 can be inserted therethrough. Further, at one end thereof, there is provided a grip portion 26b formed so as to cover the plunger pressing portion 9b and have a size that can be easily gripped by a hand. Further, in a state where the grip portion 26b is in contact with the rear end of the main body 2, it has a reduced diameter portion 26d which is inserted through the rear end opening of the main body 2 into the main body 2 and which cannot slide in the axial direction. ing. Accordingly, the setting member 26 is provided so as to be rotatable and non-slidable with respect to the main body. Then, as shown in FIG. 3, the setting member 26 has a second axially extending second portion for spline coupling with the concave portion or the convex portion 9c of the third plunger 9 on the inner side surface through which the third plunger 9 is inserted. Has a convex portion or a concave portion 26e. Thus, by rotating the setting member 26, the third plunger 9 rotates together and independently moves in the axial direction of the main body 2.

In addition, the medicine dose setting member 26 has a concave portion that engages with a convex portion or a concave portion 2 c provided on the rear end surface of the cylindrical body 2 on the contact surface with the rear end surface of the cylindrical main body 2. Alternatively, it preferably has a convex portion 26c. In this embodiment, as shown in FIG. 5, the recesses or protrusions 26c are formed as four recesses, and the protrusions or recesses 2c are formed on the protrusions that engage with the recesses. Further, as described above, the rear end portion of the third plunger 9 has the plunger pressing portion 9b, and the engaging portion between the plunger pressing portion 9b and the medicine dosage setting member 26 is As shown in FIG. 5, it is preferable that a second spring 29 that urges the medicine dosage setting member 26 in the distal direction is attached. As a result, the medicine dose setting member 26 abuts on the rear end surface of the tubular body 2 in a pressed state, so that the convex portion or the concave portion 2c and the concave portion or the convex portion 26c are securely engaged with each other. The click mechanism between the rear end opening of the cylindrical main body 2 and the medicine dose setting member 26 becomes better, and the click feeling is improved.

When a click mechanism is formed between the rear end opening of the cylindrical main body 2 and the medicine dose setting member 26, the pitch of the first concave-convex portion 11b of the first plunger 11 is , The pitch of the screw portion 8a of the second plunger 8 and the number of the convex portions or the concave portions 26a of the medicine dosage setting member 26 are preferably set. That is, a value (P / N) obtained by dividing 1 pitch (P) mm of the screw portion 8a by the number (N) of the recessed portions 26a and 1 pitch (M) of the first uneven portion 11c are the same, or The pitch of the first concavo-convex portion 11b is set so that the value obtained by dividing P / N by a natural number Z of 2 or more is one pitch M (M = P / N · Z) of the first concavo-convex portion 11b. Is Rukoto. More preferably, the pitch of the first concavo-convex portion 11b is set to a value obtained by dividing the pitch of the screw portion 8a by the number of the concave portions 26a. Thus, by setting the pitch of the first uneven portion 11b in accordance with the pitch of the screw portion 8a and the number of the recessed portions 26a, the first uneven portion 11c and the second uneven portion 17b of the stopper 17 are It is surely occluded, and the dispensing amount set by the setting member 26 can be accurately dispensed. In this embodiment, as shown in FIG. 3, four recesses (in this embodiment, the recesses are formed by slits extending in the axial direction) 26a are provided 90 degrees apart from each other. Since the pitch of the screw portion 8a is set to be the same as the axial moving distance of the piston P required to dispense the drug of 8 unit, the pitch of the first uneven portion 11b is 2u nit of the drug. Is set so as to be the same as the moving distance in the axial direction of the piston P required to dispense the.

Then, the drug quantitative dispensing device 1 of the present invention detects the rotation amount or the movement distance of the third plunger 9, and when the rear end portion of the third plunger 9 is pressed by the detected value. It has a drug dispensing amount calculation unit 20 for calculating the drug dispensing amount of. The drug-dispensing-amount calculating unit 20 has a detector 20b for detecting the rotation amount of the third plunger 9 or the moving distance in the rear end direction. A linear encoder or a rotary encoder can be used as the detector 20b. The encoder may be of the voltage type, magnetic type or electromagnetic induction type. When a linear encoder is used, for example, a magnetic head is attached to the inner surface of the cylindrical main body 2 at predetermined intervals in the longitudinal direction, and a detection head for detecting a magnetic index on the third plunger 9 (for example, a Hall element). , A magnetoresistive element) may be provided. On the contrary, the magnetic index may be provided on the third plunger 9 and the detection head may be provided on the cylindrical main body 2. With these, when the third plunger 9 moves toward the rear end, the moving distance of the third plunger 9 can be detected by the number of magnetic indexes detected by the detection head. Then, the amount of medicine dispensed when the plunger pressing portion 9b is pressed is calculated from the detected value of the moving distance by this detector. Normally, the moving distance of the third plunger 9 is equal to the moving distance of the piston P toward the tip side by the first plunger 11, so the drug dispensing amount is stored in advance in the moving distance of the third plunger 9. It is calculated by adding up the internal cross-sectional area of the existing cartridges. Further, the detector is not limited to the linear encoder type, but a magnetic index provided in the third plunger 9 in parallel with the axial direction and separated by a predetermined distance, and a detection head provided in the cylindrical body 2, A rotary encoder type that detects the rotation amount of the third plunger 9 may be used.

A rotary encoder is used in the drug quantitative dispensing device 1 of this embodiment, and as shown in FIG. When the index 20a provided on the rotating rotor 27, the detection head 20b that detects the amount of rotation or the amount of movement of the index 20a toward the rear end, and the plunger pressing portion 9b are pressed based on the detection value of the detection head 20b. The calculation processing unit 20c that calculates the drug dispensing amount is configured to calculate the drug dispensing amount.

The rotor 27 of this embodiment has a disk shape having a hole in the center, and is spline-coupled with the third plunger 9 to rotate in conjunction with the third plunger 9 and to rotate the shaft of the main body 2. It is attached so that it does not move in the direction. Specifically, the hole (inner surface) is formed with a convex portion or concave portion 27a that engages with the concave portion or convex portion 9c of the third plunger 9, and further, the rotor 27 is It is formed so as to come into contact with the second stopper 31 and also come into contact with the medicine dosage setting member 26 in the rear end direction. Therefore, the rotor 27 rotates together with the third plunger 9, but does not move in the axial direction of the tubular body 2.

The indexes 20a of this embodiment are provided on the rotor 27 at the same angle. The number of the indexes 20a is determined by the unit of calculation and display of the dispensed amount with respect to the drug amount dispensed when the third plunger 9 is rotated 360 °. In this embodiment, as described above, the medicine dispensed by rotating the third plunger 9 by 360 ° is 8 units, and the dispensing amount is set to be calculated and displayed in units of 2 units. , 20 are provided on the outer periphery of the rotor 27 at intervals of 90 °. In order to prevent the detection head 20b from being erroneously detected, it is preferable that the index 20a is provided outside the center of the rotor 27 (near the hole), where the movement distance by rotation is large. Further, for example, the rotor 20 is not provided, the index 20a is provided to the setting member 26 at the same angle, and the detection head 20b is provided adjacent to the setting member 26, whereby the rotation amount of the setting member 26 and the index 20a are set. The detection head 20b may detect the rotation amount of the setting member 26 in correspondence with the number of the above.

As shown in FIG. 14, the detection head 20b has a sensor (not shown) for detecting the rotation of the index 20a. Further, the sensor in this embodiment preferably has two sensors for detecting two adjacent phases, that is, the A phase 37 and the B phase 38. When the index 20a rotates counterclockwise toward the tip of the main body 2, the index 20a is detected in the order of A phase 37 and B phase 38, and conversely when the index 20a rotates clockwise, the B phase is detected. 38 and A phase 37 are detected in this order. This is a means for discriminating the rotation direction of the third plunger 9 and increasing or decreasing the drug dispensing amount calculated from this. The arithmetic processing unit 20c is set to determine the detection order of the index 20a in the A phase 37 and the B phase 38, and increase or decrease the detection value according to the order. That is, in the medicine fixed-quantity dispenser 1 of this embodiment, when the setting member 26 is rotated to set the dosage, the third plunger 9 is rotated counterclockwise by 2 units in the direction toward the distal end of the tubular body 2. By turning, the detector detects one index in the order of A phase and B phase, and the arithmetic processing unit 20c discriminates this order and sends an electric signal for increasing the detected value by 1 to the display unit 21 described later. When it is turned clockwise, the signal is sent to decrease the detected value by one by the opposite effect. By setting in this way, even if the setting member 26 is mistakenly turned too much when setting the medicine dispensing amount, the dispensing amount to be set can be corrected by rotating in the opposite direction. Then, the drug dosage calculating unit 20 is electrically connected to the display unit 21, and the calculated value of the drug dosage calculated by the drug dosage calculating unit 20 is converted into an electric signal. , Is digitally displayed on the display unit 21. As the display unit 21, a liquid crystal display (LCD) or the like can be used.

As the arithmetic processing unit 20c, it is preferable to use one having a central processing unit (CPU), a read only memory (ROM), and a random access memory (RAM). Normally, the moving distance of the third plunger 9 and the distance by which the piston P advances toward the tip side by the first plunger 11 are equal, so the drug dispensing amount is calculated in advance by the arithmetic processing unit based on the moving distance of the third plunger 9. It is calculated by integrating the internal cross-sectional area of the cartridge stored in 20c.

Further, as shown in FIG. 5, the drug fixed amount dispenser 1 of the present invention has a reset switch 33 at the front end side at a predetermined distance from the stopper 10 inside the cylindrical main body 2. The reset switch 33 is for resetting the display of the display unit 21 to 0 after the medicine is dispensed. Specifically, the drug fixed amount dispenser 1 of this embodiment has three terminals A, B, and C connected to the arithmetic processing unit 20c and a terminal A depending on whether the reset switch 33 is connected or not. It has a changeover switch 39 for switching so that the terminals B, A and C are connected. Then, after the second plunger 8 is stopped from moving in the distal direction by the stopper 10 and then the reset switch 33 is further pressed by the reset switch pressing portion 9a protruding further in the distal direction, it is shown in FIG. As described above, the changeover switch 39 is actuated and the display of the display unit 21 is set to zero. Alternatively, the changeover switch 39 may not be provided, and the reset switch 33 may be directly connected to the CPU and reset by the CPU. As the reset switch 33, a touch sensor such as a limit switch or a micro switch can be preferably used. The reset switch 33 may be provided at a position separated from the reset switch pressing portion 9a by a predetermined distance when the second plunger 8 is locked by the stopper 10. That is, the reset switch 33 does not necessarily have to be provided at the front end side by a predetermined distance from the stopper 10 as in this embodiment, and is not limited to the structure of the drug quantitative dispensing device 1 of this embodiment.

Further, although the drug metered-dose dispenser 1 according to the present invention may be disposable, it is preferable that the cartridge 22 is detachable so that it can be used semi-permanently by replacing it with a new cartridge. Then, in order to make the cartridge 22 detachable, in the medicine fixed amount dispenser 1, the first plunger 11 and the second plunger 8 are screwed together and the first plunger 11 is moved toward the rear end. A mechanism for releasing the means for preventing this is required. By having such a mechanism, the first plunger 11 can be moved in the rear end direction, and the second plunger 8 can be moved in the front end direction of the first plunger 11.

In this embodiment, as described above, the cartridge receiving member 23 is provided inside the cylindrical main body 2 so as to be movable in the longitudinal direction. The cartridge receiving member 23 is formed in a substantially cylindrical shape, and its thickness is gradually reduced toward the rear end, as shown in FIG. For this reason, the inner peripheral surface of the receiving member 23 forms a taper portion 23a whose inner diameter increases toward the rear end side of the main body 2. The tip surface of the receiving member 23 forms a contact portion 23b that contacts the rear end portion of the cartridge 22. Further, the third stopper 17 has a tongue-shaped member 17d, the outer surface of which forms an inclined surface 17a that approaches the inner surface of the main body 2 toward the rear end direction, and the third stopper 17 and the taper portion 23a of the cartridge receiving member 23. The inclined surface 17a is arranged so as to always contact. A third spring 30 is provided between the cartridge receiver 23 and the third stopper fixing portion 24, and the cartridge receiver 23 is urged toward the tip end by the expanding action of the spring.

12 and 13 are enlarged cross-sectional views for explaining the operation of the third stopper 17 and the cartridge receiver 23, and FIG. 12 is a partial enlarged cross-sectional view of the vicinity of the cartridge receiver 23 when the cartridge is replaced. FIG. 13 is a partially enlarged cross-sectional view of the vicinity of the cartridge 23 receiver after the cartridge is replaced. Using these, the method of replacing the medicine cartridge in this embodiment will be described. First, when the drug S in the cartridge 22 is exhausted, the cap 19 is removed, then the cartridge holder 13 is grasped, the screw body 15b is loosened, and the injection needle 15 with the needle cap 15a covered is attached to the rubber stopper 22d of the cartridge 22. Pull out and remove. Next, the cartridge holder 13 is gripped and rotated to release the screwed state (that is, the screw portion 11a and the screw portion 8a are screwed) to the main body 2, the cartridge holder 13 is removed from the main body 2, and the empty cartridge 22 is removed. Take it out. Here, as described above, since the cartridge receiving member 23 is biased toward the tip end by the third spring 30, it moves toward the tip end, and as shown in FIG. The second concavo-convex portion and the first concavo-convex portion of the first plunger 11 are engaged with each other, and the first plunger 11 and the second plunger 8 are unscrewed from each other. Next, the tip end portion 11d of the protruding first plunger 11 is brought into contact with the rear end of the new cartridge 22, and the first plunger 11 is housed in the cylindrical main body 2 while being pressed toward the rear end. . Then, the screw portion 13a of the cartridge holder 13 and the female screw portion 2a of the main body 2 are rotated and screwed together with a force exceeding the biasing force of the third spring 30. At this time, as the cartridge holder 13 moves toward the rear end, the taper portion 23a of the cartridge holder 23 presses the inclined surface 17a of the third stopper 17 toward the center. Therefore, as shown in FIG. 13, the second uneven portion 17b of the third stopper 17 moves and engages with the first uneven portion 11b of the first plunger 11. Further, the urging force in the central direction acts on the first plunger 11, the screw portion 11a and the screw portion 8a are screwed together, and the replacement work of the cartridge is completed.

Further, it is preferable that a piezoelectric buzzer is provided in the drug fixed amount dispenser 1 of the present embodiment. The piezoelectric buzzer is set to ring when the reset switch 33 is pressed by the reset switch pressing portion 9a. As a result, it can be confirmed by the buzzer sound that the display unit 21 is zero-displayed. Further, the drug fixed amount dispenser 1 in this embodiment has a power source. A solar cell can be preferably used as a power source. When a solar cell is not used as a power source, a power switch is required. The power switch is used when the cap 19 that encloses the cartridge holder 13 of the tubular body 2 is attached to the drug quantitative dispensing device 1. In addition, it may be provided at a position where it comes into contact with the rear end of the cap 19. This makes it possible to set the power to not turn on when the cap 19 is in contact with the power switch and to turn on when the cap 19 is removed. As the power switch in this case, a touch sensor such as a limit switch or a micro switch can be used.

[0044]

[Action]

 Next, the operation when using the drug quantitative dispensing device 1 of the present invention will be described with reference to FIGS. 5, 15 and 16. When dispensing a drug using the drug fixed amount dispenser 1, first, the setting member 26 is grasped and turned counterclockwise toward the front end direction of the main body 2. As a result, the third plunger 9 that is splined to the setting member 26 and the second plunger 8 that is engaged with the third plunger 9 rotate together and move toward the rear end. The plunger pressing portion 8b provided at the rear end of the third plunger 9 projects from the rear end of the setting member 26. The state is shown in FIG. On the other hand, at the same time, the rotor 27 splined to the third plunger 9 rotates together, the detection head 20b detects the rotation, and sends an electric signal to the arithmetic processing unit 20c. The arithmetic processing unit 20c calculates the amount of medicine dispensed when the plunger pressing unit 9b is pressed, from the amount of rotation of the rotor 27, that is, the amount of rotation of the third plunger 9 (and the setting member 26). Then, it is digitally displayed on the display unit 21. As described above, the dispensing amount setting operation of the drug fixed amount dispenser 1 of the present invention is only easy to grasp and rotate the setting member 26, and is extremely easy as compared with the conventional dispenser. Further, when the setting member 26 is rotated too much more than the desired dispensing amount, the arithmetic processing unit 20c rotates the setting member 26 in the clockwise direction to display an electric signal for reducing the calculated dispensing amount. Since it is sent to the section 21, the medicine dosage displayed on the display section 21 is reduced and the dosage can be corrected.

Then, after the injection needle cap 15a is removed and the injection needle 15 is punctured at the puncture site, the plunger pressing portion 9b protruding from the setting member 26 is pressed until the second plunger 8 contacts the stopper 10. And administer the drug. Next, the plunger pressing portion 8b is pressed again while the injection needle 15 is being pierced at the puncture site. At this time, while the second plunger 8 is locked by the stopper 10, only the third plunger 9 moves in the tip direction, and the reset switch pressing portion 9a provided at the tip of the third plunger 9 is pushed. Comes into contact with the reset switch 33. Then, as described above, the reset switch 33 comes into contact with the changeover switch 39, the arithmetic processing section 20c sends an electric signal to the display section 21, and zero is displayed on the display section 21. Further, when the piezoelectric buzzer 43 is provided, the piezoelectric buzzer 43 1 sounds. As described above, in the drug fixed amount dispenser 1 of the present invention, the reset switch 33 is provided at the front end side by a predetermined distance from the position where the stopper 10 is provided, and the plunger pressing portion 9b can be pressed again. As a result, the reset switch pressing portion 9a protrudes and comes into contact with the reset switch 33. Therefore, a zero display is not made during the dispensing, and the drug dispensing amount and the display on the display unit 21 are not displayed. Can correspond exactly.

[0046]

[Effect of device]

 A drug-dispensing dispenser 1 of the present invention has a drug cartridge mounting portion for mounting a drug cartridge having a drug and a slidable piston, a tubular main body having an open rear end, and a tubular main body A first plunger for pressing the piston of the medicine cartridge, which has a threaded portion, and a threaded portion that is screwed into the threaded portion of the first plunger, A second plunger, which is rotatably and slidably provided in the cylindrical body, for moving the first plunger in the distal direction, and a second switch mounted on the rear portion of the second plunger and pressing a reset switch. A third plunger having a rear end portion protruding from the rear end opening of the tubular body, and the third plunger slidably inserted into the rear end of the tubular body. Non-sliding and rotatable A drug dispensing amount setting member for rotating the third plunger attached to the second plunger, and a rotation amount or a moving distance of the third plunger, and the detected value is used to detect the rear of the third plunger. A drug dispensing amount calculation unit that calculates a drug dispensing amount when the end portion is pressed, a display unit that displays the drug dispensing amount calculated by the drug dispensing amount calculation unit, and the second plan A stopper for locking the movement of the jar in the distal direction from a predetermined position, and a stopper provided at a front side for a predetermined distance from the position of the reset switch pressing portion when the second plunger is locked by the stopper. And a reset switch for resetting the display on the display unit, the reset switch having the reset switch of the third plunger after the second plunger is locked by the stopper. This is characterized in that it is provided at a position where it comes into contact with the push unit, so that the reset switch does not operate during dispensing, and the digital display value and the actual dispensing amount are Correspond accurately and can reliably dispense the set amount of medicine.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a drug quantitative dispensing device of the present invention.

FIG. 2 is a vertical cross-sectional view of FIG.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a cross-sectional view of the medicine dose setting member of FIG. 3 rotated by a predetermined angle.

FIG. 5 is a partially enlarged cross-sectional view of the vicinity of the rear part of an embodiment of the drug quantitative dispensing device of the present invention.

6 is a cross-sectional view taken along the line BB of FIG.

7 is a cross-sectional view taken along the line CC of FIG.

8 is a cross-sectional view taken along the line DD of FIG.

9 is a cross-sectional view taken along the line EE of FIG.

10 is a sectional view taken along line FF of FIG.

11 is a cross-sectional view taken along the line GG of FIG.

FIG. 12 is a partially enlarged cross-sectional view of an embodiment of the drug quantitative dispensing device of the present invention when the cartridge is replaced.

FIG. 13 is a partially enlarged cross-sectional view of an embodiment of the drug quantitative dispensing device of the present invention after the cartridge is replaced.

FIG. 14 is a block diagram of an electric circuit of an embodiment of the drug quantitative dispensing device of the present invention.

FIG. 15 is an explanatory view for explaining the operation of the drug quantitative dispensing device of the present invention.

FIG. 16 is an explanatory view for explaining the operation of the drug quantitative dispensing device of the present invention.

[Explanation of symbols]

 1 Drug Quantitative Dispenser 2 Cylindrical Main Body 2a Tightening Screw 2b Recessed or Convexed 2c Convex or Recessed 8 Second Plunger 8a Screw 8b Recessed or Convexed 8e Step 9 Third Plunger 9a Reset Switch Pressing 9b Plunger pressing portion 9c Recessed portion or protruding portion 10 Stopper 10a Convex portion or recessed portion 11 First plunger 11a Screw portion 11b First uneven portion 11c Slit 11d Tip portion 11e Step portion 13 Cartridge holder 13a Screw portion 13b Port screw portion 14 Drug cartridge mounting portion 14d Rubber stopper 15 Injection needle 15a Injection needle cap 15b Screw body 17 Third stopper 17a Inclined surface 17b Second uneven portion 17c Convex portion 17d Tongue-like portion 18 Plunger connector 18a Recessed portion or convex portion 19 Cap 20 Drug dosage calculator 2 0a index 20b detection head 20c arithmetic processing unit 21 display unit 22 drug cartridge 23 cartridge receiver 23a tapered surface 23b abutting part 23c convex parts 24a, 24b third stopper fixing part 26 drug dosage setting member 26a convex part or concave part 26b Gripping portion 26c Recessed portion or convex portion 26d Reduced diameter portion 26e Second convex portion or recessed portion 27 Rotor 27a Convex portion or recessed portion 28 First spring 29 Second spring 30 Third spring 31 Second stopper 31a Convex portion or recessed portion 33 Reset Switch 37 A phase 38 B phase 39 changeover switch

Claims (1)

[Scope of utility model registration request] 1. A tubular body having a drug cartridge mounting portion for mounting a drug cartridge having a drug and a slidable piston, a tubular body having a rear end opened, and a screw portion housed in the tubular body. A first plunger for pressing the piston of the medicine cartridge, and a threaded portion screwed with a threaded portion of the first plunger,
A second plunger, which is rotatably and slidably provided in the tubular body by the screwing, for moving the first plunger in a distal direction, and is attached to a rear portion of the second plunger. A third plunger having a reset switch pressing portion and a rear end portion protruding from a rear end opening of the tubular body; and a third plunger slidably inserted therein A non-slidably and rotatably attached to the rear end of the main body, a drug dose setting member for rotating the third plunger; and a rotation amount or a moving distance of the third plunger, A drug dosage calculating unit that calculates the drug dosage when the rear end of the third plunger is pressed by the detected value, and the drug dosage calculated by the drug dosage calculating unit are displayed. Display unit and the second plunger A stopper for locking movement from a predetermined position toward the front end, and the display unit provided at a front end for a predetermined distance from the position of the reset switch pressing unit when the second plunger is locked by the stopper. And a reset switch for resetting the display of, the reset switch being provided at a position in contact with the reset switch pressing portion after the second plunger is locked by the stopper. Characteristic drug dispenser.