JPH0578246U - Drug dispenser - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a drug quantitative dispensing device which is easy to use and easy to set the drug dispensing amount. A cylindrical housing having a drug cartridge housing part for housing a drug cartridge having a drug and a piston and having a rear end opened, and a front end part for pressing the piston and a first screw part formed on an outer peripheral surface. And a rod-shaped plunger having a pressing portion provided at the rear end, a first engaging portion formed on the outer peripheral surface attached to the rod-shaped plunger, a first drug-dispensing-quantity indicating portion, and an inner peripheral surface. A dispensing amount that has a first screw portion and a second screw portion that are screwed together and that is movable in the axial direction by screwing the first screw portion and the second screw portion. The setting member, the medicine dosage instructing portion of the dosage setting member can be visually recognized from the outside, the window extending in the axial direction, and the first medicine dosage display provided around the window and the dosage. A second engaging portion that engages with the first engaging portion of the setting member and extends in the axial direction. And, by rotating, and a cylindrical dispensing amount setting member moving cap to move the dispensing amount setting member in the axial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a drug dispensing device which is equipped with a drug cartridge and which can set and dispense the dose of a drug filled in the cartridge.

[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 treating diabetes. In addition, diabetic patients who need to administer insulin several times a day must carry a syringe and ampoule bottle of the drug all the time, which is inconvenient to carry, and the carrier himself has diabetes. There was also a sense of anxiety that other people would know. Further, when dispensing the drug from the ampoule bottle to the injector, it is necessary to puncture the rubber stopper of the ampoule bottle with the injection needle, which makes the administration of insulin difficult. Furthermore, when the injection needle is pierced into the rubber stopper of the ampoule bottle, there is a risk that the needle tip of the injection needle will be damaged or the puncture resistance will increase. Therefore, there is proposed a pen-type drug quantitative dispensing device which can dispense an arbitrary amount of the drug filled in the cartridge and is portable.

[0003]

[Problems to be solved by the device]

 However, the conventional pen-type drug dispensing device has a problem that the structure is complicated and the size thereof is increased, and the operation of setting the dispensing amount is complicated and it is difficult to use.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems, and an object thereof is to provide a drug quantitative dispensing device which has a simple structure and is small in size, and which is easy to set and operate. Especially.

What achieves the above-mentioned object is to have a drug cartridge containing section for containing a drug cartridge having a drug and a slidable piston, and a cylindrical housing having a rear end opened, and the drug cartridge. It has a front end for pressing the piston, a first screw portion formed on the outer peripheral surface, and a pressing portion provided at the rear end, and is inserted into the cylindrical housing through the rear end opening. Rod-shaped plunger, a first engagement portion attached to the rod-shaped plunger and formed on the outer peripheral surface, and a first medicine dispensing amount instruction portion provided on the first engagement portion And a second screw portion that is screwed with the first screw portion of the rod-shaped plunger formed on the inner peripheral surface, and by screwing the first screw portion and the second screw portion, A dosage setting member movable in the axial direction of the rod-shaped plunger, Surrounding the rod-shaped plunger and the dose setting member, the axially extending window part that allows the drug dose indicating part of the dose setting part to be visible from the outside, and the window part around the window part. A first medicine dose display portion provided and a second engagement member formed on the inner peripheral surface, which engages with the first engagement portion of the dose setting member and extends in the axial direction. And a cylindrical dispensing amount setting member moving cap that moves the dispensing amount setting member in the axial direction of the rod-shaped plunger by rotating the dispensing amount setting member. It is a dispenser.

Further, it is preferable that the tubular housing has a fitting portion with the cap for moving the dosage setting member. Further, it is preferable that the fitting portion of the tubular housing is formed to have a diameter slightly smaller than the inner diameter of the cap for moving the dosage setting member. Further, it is preferable that the fitting portion of the tubular housing is adapted to detachably fit the cap for moving the dosage setting member. Further, it is preferable that the tubular housing is formed of a transparent or semi-transparent material and has a drug residual amount display portion on the outer surface. The cylindrical housing has a second medicine dose display portion on the outer peripheral surface near the rear end portion, and the cap for moving the dose setting member described above has a distal end portion. It is preferable that the outer peripheral surface has a second medicine dose instructing section. The piston of the medicine cartridge has a second recess at the rear end thereof, and the tip of the rod-shaped plunger fits into the second recess of the piston. It is preferable to have The second engaging portion of the dispensing amount setting member moving cap includes a plurality of first concave portions or convex portions that are provided at equal angular intervals and extend in parallel to the axial direction. The fitting portion of the tubular housing has a first convex portion or a concave portion that engages with the first concave portion or the convex portion of the dispensing amount setting member moving cap. The dose setting member moving cap and the fitting portion of the tubular housing are intermittently rotated by the rotation of the dose setting member moving cap to form the first concave portion or the convex portion and the first convex portion. Alternatively, it is preferable to form a click mechanism with which the recess is engaged. The dispensing amount setting member moving cap is capable of penetrating the window part and slidable in the window part, and in the axial direction and the rear end direction of the rod-shaped plunger of the dispensing amount setting member. It is preferable that a stopper is provided to prevent movement to the. In addition, it is preferable that the tubular housing has a rubber member inside the rear end portion that surrounds and presses the rod-shaped plunger to prevent the rod-shaped plunger from returning and rotating. .. Further, the fitting portion of the tubular housing has a plurality of second concave portions or convex portions which are provided on the outer peripheral surface at equal angular intervals and are parallel to each other, and which are parallel to the axial direction. The cap has a second convex portion or a concave portion that engages with a second concave portion or a convex portion of the fitting portion on the inner surface of the tip portion, and the fitting portion and the dose setting member moving cap are A click mechanism is formed by which the second concave portion or the convex portion and the second convex portion or the concave portion are intermittently engaged with each other by the rotation of the cap for moving the dosage setting member. preferable. The rod-shaped plunger is provided on the outer peripheral surface at equal angular intervals, and has a plurality of first recesses extending in the axial direction. Further, the dispensing amount setting member is provided on the inner peripheral surface of the rod-shaped plunger. The rod-shaped plunger and the dispensing amount setting member have a first convex portion that engages with the first concave portion of the jar, and the rod-shaped plunger and the dispensing amount setting member are intermittently rotated by the rotation of the dispensing amount setting member. It is preferable to form a click mechanism in which the first convex portion and the first convex portion are engaged with each other. Further, the depth of the groove of the first concave portion of the rod-shaped plunger and the groove of the first convex portion of the dispensing amount setting member is equal to the depth of the first screw portion of the rod-shaped plunger or the dispensing portion. It is preferably smaller than the depth of the groove of the second screw portion of the amount setting member. Further, it is preferable that the tubular housing has a rod-shaped plunger rotation preventing member having a third convex portion that engages with the first concave portion of the rod-shaped plunger at a rear end portion.

Therefore, the drug quantitative dispensing device of the present invention will be described with reference to an embodiment shown in the drawings. A drug-dispensing dispenser 1 of the present invention has a drug cartridge housing portion 21 for housing a drug cartridge 10 having a drug and a slidable piston 11, a tubular housing 2 having an open rear end, and a drug. It has a front end portion 31 for pressing the piston 11 of the cartridge 10, a first screw portion 32 formed on the outer peripheral surface, and a pressing portion 33 provided at the rear end, and is provided in the cylindrical housing 2 with a rear portion. The rod-shaped plunger 3 inserted from the end opening, the first engaging portion 41 attached to the rod-shaped plunger 3 and formed on the outer peripheral surface, and the first drug provided on the first engaging portion 41. It has a dispensing amount instruction part 42 and a second screw part 43 which is screwed with the first screw part 32 of the rod-shaped plunger 3 formed on the inner peripheral surface, and is provided with the first screw part 32 and the first screw part 32. By screwing the screw part 43 of No. 2, the axial direction of the rod-shaped plunger 3 The movable dosage setting member 4, the rod-shaped plunger 3 and the dosage setting member 4 are surrounded, and the drug dosage designating section 42 of the dosage setting member 4 extends in the axial direction to be visible from the outside. The window portion 51, the first drug dose display portion 52 provided around the window portion 51, and the first engaging portion 41 of the dose setting member 4 formed on the inner peripheral surface. A cylindrical dispensing amount that engages with and has a second engaging portion 53 that extends in the axial direction and that moves the dispensing amount setting member 4 in the axial direction of the rod-shaped plunger 3 by rotating it. It has a setting member moving cap 5.

Hereinafter, the drug quantitative dispensing device 1 of the present invention will be described with reference to an embodiment shown in FIGS. 1 to 6. FIG. 1 is a perspective view of an embodiment of the drug metering and dispensing device of the present invention, FIG. 2 is a longitudinal sectional view of the drug metering and dispensing device 1 shown in FIG. 1, and FIG. 4 is a sectional view taken along the line AA, FIG. 4 is a sectional view taken along the line BB of FIG. 2, FIG. 5 is a sectional view taken along the line CC of FIG. 2, and FIG. 6 is shown in FIG. FIG. 3 is a partially enlarged cross-sectional view of the vicinity of a stopper 6 attachment portion of the drug quantitative dispensing device 1.

The tubular housing 2 of the drug dispenser 1 of the embodiment shown in FIG. 1 is made of a translucent material, and as shown in FIG. 2, its rear end is open. The cylindrical housing 2 is composed of a medicine cartridge housing portion 21 for housing a medicine cartridge 10 having a medicine and a slidable piston 11, and a fitting portion 22. As shown in FIG. On the surface, there is a drug residual amount display unit 26 and a second drug dosage display unit 24.

The tubular housing 2 is made of a semi-transparent material so that the residual drug amount can be confirmed on the residual drug amount display portion 26 during use. The drug residual amount display section 26 has a scale corresponding to the residual amount of the drug visible when the drug fixed amount dispenser 1 is erected with the tip side (needle holder 14 side) facing down. Etc. Further, the rear end of the cylindrical housing 2 is open for inserting a rod-shaped plunger 3 described later. Although the cylindrical housing 2 of this embodiment is formed in a cylindrical shape, it may be formed into a polygonal prism such as a pentagonal prism to prevent rolling.

The drug cartridge 10 is stored in the drug cartridge storage portion 21 of the cylindrical housing 2. The drug cartridge 10 has a rubber plug 15 pierced by an injection needle 12 (double-ended needle) at the tip end in a state where a liquid drug (for example, insulin) is filled inside, and at the rear end, It has a piston 11 that is slidable in the longitudinal direction while maintaining liquid tightness. The piston 11 is moved in the direction of the rubber stopper 15 of the drug cartridge 10 so that the drug is dispensed from the injection needle 12. As shown in FIG. 2, the piston 11 has a second concave portion 11a that fits into a second convex portion 35 of the rod-shaped plunger 3 described later. Further, an injection needle 12 for inserting the inside and the outside of the medicine cartridge 10 is exchangeably attached to the tip of the medicine cartridge housing portion 21. The injection needle 12 is covered with a needle cap 13 for protecting the needle tip (the biopsy side) of the injection needle 12 and for preventing the danger after disposal. Further, a needle holder 14 that covers and protects the injection needle 12 is detachably attached to the tip of the cylindrical housing 2.

It is preferable that the fitting portion 22 of the tubular housing is adapted to detachably fit the cap 5 for moving a dosage setting member described later, and as shown in FIG. It is preferable that the diameter is slightly smaller than the inner diameter of the member moving cap 5. As shown in FIG. 4, the fitting portion 22 has a first convex portion or concave portion 23 that engages with a first concave portion or convex portion 54 of the dose setting member moving cap 5 described later. Therefore, the dispensing amount setting member moving cap 5 and the fitting part 22 are intermittently rotated by the rotation of the dispensing amount setting member moving cap 5 to intermittently form the first concave portion or the convex portion 54 and the first convex portion. Alternatively, it is preferable to form a click mechanism with which the recess 23 is engaged. In this embodiment, the first convex portion or the concave portion 23 is formed in the convex portion as shown in FIG. Further, it is preferable that slits 23a and 23b are provided at both ends of the first convex portion or the concave portion 23 as shown in FIG.

As shown in FIG. 1, the second medicine dose display section 24 displays the medicines of less than 10 units by the second medicine dose instructing section 56 of the dose setting member moving cap 5 described later. It is provided on the outer peripheral surface near the rear end of the cylindrical housing 2 so that the amount of the dispensed agent can be accurately confirmed. Then, in this embodiment, the second medicine dose display portion is engraved or printed with five even numbers (0, 2, 4, 6, 8) from 0 to 8 every 72 degrees. Etc.

The rod-shaped plunger 3 is inserted from the rear end opening of the tubular housing 2. The rod-shaped plunger 3 is for pressing the piston 11 of the medicine cartridge 10. As shown in FIG. 2, the rod-shaped plunger 3 is formed on the tip end portion 31 for pressing the piston 11 of the medicine cartridge 10 and the outer peripheral surface. It has a first screw portion 32 and a pressing portion 33 provided at the rear end. As shown in FIG. 2, it is preferable that the tip portion 31 of the rod-shaped plunger has a second convex portion 35 that fits into the above-mentioned second concave portion 11a of the piston 11. As described above, by fitting the piston 11 and the tip end portion 31 and connecting them, the dosage setting member 4 described later is rotated and moved in the axial direction and the rear end direction of the rod-shaped plunger 3. At this time, it is possible to prevent the rod-shaped plunger 3 from moving in the rear end direction (returning back) as the dispensing amount setting member 4 moves. Further, as shown in FIG. 5, the second convex portion 35 of the rod-shaped plunger 3 has a polygonal (quadrangular shape in FIG. 5) cross section, so that the dosage setting member 4 is rotated. At this time, it is possible to prevent the rod-shaped plunger 3 from rotating due to the rotation of the dosage setting member 4. Further, the first screw portion 32 is screwed with a second screw portion 43 of the dispensing amount setting member 4 which will be described later, and the screwing moves the dispensing amount setting member 4 in the axial direction of the rod-shaped plunger 3. It is for making it. Further, in this embodiment, the pitch of the first screw portion 32 is set corresponding to the scale of the second medicine dosage display portion 24 of the cylindrical housing 2 described above. That is, since the scale of the second medicine dose display section 24 is written to be 10 units at 2 unit / 72 ° and 360 ° as described above, the pitch of the first screw section 32 is Also, it is set to be the same as the axial movement distance of the piston 11 required to dispense the drug of 10 units. As a result, it becomes possible to dispense the drug corresponding to the second drug dose display unit 24. Further, the pressing portion 33 is provided for pressing when the medicine is dispensed to the patient.

Then, the rod-shaped plunger 3 has a first engaging portion 41 formed on the outer peripheral surface, a first medicine dispensing amount instruction portion 42 provided in the first engaging portion 41, The rod-shaped plunger 3 formed on the inner peripheral surface has a first screw portion 32 and a second screw portion 43 which are screwed together, and the first screw portion 32 and the second screw portion 43 are screwed together. Thus, the dispensing amount setting member 4 that is movable in the axial direction of the rod-shaped plunger 3 is attached. The first engaging portion 41 engages with a second engaging portion 53 of the dispensing amount setting member moving cap 5 which will be described later, so that the dispensing amount setting member 4 is moved together with the dispensing amount setting member moving cap 5. This is for rotation, and in this embodiment, as shown in FIG. 3, it has irregularities provided at intervals of 36 °. The first medicine dispensing amount instructing unit 42 is for instructing a set dispensing amount, and is provided in the first engaging unit 41 as shown in FIG. Then, a mark formed by printing, engraving, or the like is provided on the upper surface of the medicine dosage instructing section 42, and the medicine set by the mark and the first medicine dosage display section 52. It is configured so that the amount of distribution can be confirmed. In this embodiment, as the first engaging portions 41, marks are provided on all convex portions of the irregularities provided at intervals of 36 °. This is because if the previous dispensing amount was 26 units, for example, if the mark is only written on one of the convex parts, next time the dispensing amount cannot be set based on 0 (the mark is the second This is because it exists at the rear part of 6 of the drug dose display part 24 and does not appear at the back of 0). If all the convex parts have marks, the dose can always be set with reference to 0. Because. Then, the second screw portion 43 is provided so that the dispensing amount setting member 4 can be moved in the axial direction of the rod-shaped plunger 3 by screwing the first screw portion 32 and the second screw portion 43 together. It is provided.

Further, the drug fixed quantity dispenser 1 of the present invention surrounds the rod-shaped plunger 3 and the dosage setting member 4, and the drug dosage indicator 42 of the dosage setting member 4 is visible from the outside. The axially extending window portion 51, the first medicine dose display portion 52 provided around the window portion 51, and the first engagement of the dose setting member 4 formed on the inner peripheral surface. It has a second engaging portion 53 which engages with the portion 41 and extends in the axial direction, and is rotated to rotate the dosage setting member 4 in the axial direction of the rod-shaped plunger 3. A dispensing amount setting member moving cap 5 is provided.

As shown in FIG. 1, the window portion 51 is provided in the vicinity of an intermediate portion of the dispensing amount setting member moving cap 5, and has a predetermined length of the dispensing amount setting member moving cap 5. It is a long hole that extends in the axial direction. The window portion 51 is provided for visually observing the first medicine dispensing amount instructing portion 42 of the dispensing amount setting member 4 from the outside, and even if the long hole is covered with a transparent material. Good. Further, as shown in FIG. 1, a first medicine dose display section 52 is provided around the window section 51. The first medicine dose display section 52 is provided with a scale corresponding to the moving distance of the piston 11 required for dispensing a predetermined quantity of medicine, which is printed or marked. It is configured so that the drug dosage can be confirmed at the position of the first drug dosage designating unit 42 in the window 51.

The second engaging portion 53 engages with the first engaging portion 41 of the dispensing amount setting member 4 to rotate the dispensing amount setting member 4 together with the dispensing amount setting member moving cap 5. , For moving the rod-shaped plunger 3 in the axial direction. Then, in this embodiment, the second engaging portion 53 has a plurality of first concave portions or convex portions 54 extending in parallel with the axial direction and provided at 36 ° intervals, as shown in FIG. It is configured to engage with the unevenness of the first engaging portion 41. The first concave portion or the convex portion 54 forms a click mechanism with the first convex portion or the concave portion 23 of the fitting portion 22, as shown in FIG.

Further, as shown in FIG. 1, the dispensing amount setting member moving cap 5 of the drug quantitative dispensing device 1 of the present embodiment has a second drug dispensing amount instructing portion on the outer peripheral surface of the distal end portion. Has 56. The second drug dose instructing section 56 is provided for accurately confirming the drug dose of less than 10 units by the second drug dose display section 24 of the cylindrical housing 2. Further, in this embodiment, the second medicine dosage amount instructing section 56 is a mark formed by printing, engraving, etc., and is set by this mark and the first medicine dosage amount displaying section 52. It is configured so that the amount of medicine dispensed can be confirmed.

As shown in FIG. 1, the dispensing amount setting member moving cap 5 is capable of penetrating the window portion 51 and sliding in the window portion 51, and at the same time, A stopper 6 is preferably provided to prevent the tubular housing 2 from moving axially rearward. This stopper 6 is for facilitating the setting operation of the dose when re-administering the same amount of drug. In this embodiment, as shown in FIG. 6, the longitudinal section is I-shaped. The structure is such that the concavo-convex portion provided around the window portion 22 and the convex-concave portion provided on the stopper 6 are engaged with each other and locked at a desired position in the window portion 22. ing. Further, inside the dispensing amount setting member moving cap 5, the dispensing amount setting member 4 is brought into contact with the dispensing amount setting member 4 so as to prevent movement of the dispensing amount setting member 4 rearward in the axial direction of the tubular housing 2. It has a structure.

Next, another embodiment of the drug fixed amount dispenser 1 of the present invention shown in FIG. 7 will be described. FIG. 7 is a cross-sectional view of the vicinity of the fitting portion according to another embodiment of the present invention. The difference between the embodiment shown in FIG. 7 and the embodiment shown in FIG. 1 is that a plurality of fitting portions 22 of the cylindrical housing 2 are provided on the outer peripheral surface at equal angular intervals and are arranged in the axial direction. The cap 5 for moving the dosage setting member has a parallel second concave portion or convex portion 25, and the second convex portion that engages with the second concave portion or convex portion 25 of the fitting portion 22 on the inner surface of the distal end portion. The fitting portion 22 and the dosage setting member moving cap 5 have the second concave portion or the convex portion 25 intermittently by the rotation of the dosage setting member moving cap 5. And the second convex portion or the concave portion 55 is engaged to form a click mechanism. That is, unlike the click mechanism of the embodiment shown in FIG. 1, the click mechanism of this embodiment does not utilize the second engaging portion 53 of the dispensing amount setting member moving cap 5. It Then, in this embodiment, the second convex portion or concave portion 55 is formed in the convex portion as shown in FIG. Further, slits 55a and 55b are preferably provided at both ends of the second convex portion or concave portion 55.

Next, another embodiment of the drug fixed amount dispenser 1 of the present invention shown in FIGS. 8 to 11 will be described. 8 is a partially enlarged view of a rod-shaped plunger according to another embodiment of the present invention, FIG. 9 is a sectional view taken along the line D-D of FIG. 8, and FIG. 10 is a view of another embodiment of the present invention. FIG. 11 is a vertical cross-sectional view of the dispensing amount setting member, and FIG. 11 is a cross-sectional view taken along the line EE of FIG. 10. The difference between the embodiment shown in FIG. 1 and this embodiment is that the rod-shaped plunger 3 has a plurality of first concave portions 34 provided on the outer peripheral surface at equal angular intervals and extending in the axial direction. Further, the dosage setting member 5 has a first convex portion 44 that engages with the first recess 34 of the rod-shaped plunger 3 on the inner peripheral surface, and the rod-shaped plunger 3 and the dosage setting member 4 are provided. That is, the click mechanism in which the first concave portion 34 and the first convex portion 44 are intermittently engaged with each other by the rotation of the dosage setting member 4 is formed. That is, in the drug quantitative dispensing device 1 of this embodiment, the embodiment shown in FIG. 1 forms a click mechanism between the fitting portion 22 of the cylindrical housing 2 and the dispensing amount setting member moving cap 5. On the other hand, a click mechanism is formed between the rod-shaped plunger 3 and the dose setting member 4. Then, as shown in FIG. 8, the first recess 34 of the rod-shaped plunger 3 is formed by cutting the mountain portion of the first screw portion of the rod-shaped plunger 3 in parallel with the axial direction of the rod-shaped plunger. Has been done. Further, as shown in FIG. 10, the first convex portion 44 of the dosage setting member 4 is a convex portion parallel to the axial direction in a part of the valley of the second screw portion 43 of the dosage setting member 4. It is formed by providing. The first convex portion 44 of the dosage setting member 4 does not necessarily have to be provided on the second screw portion 43, and may be formed on the upper or lower portion of the dosage setting member 4 in the axial direction. Further, as shown in FIG. 9 or 11, the depth of the groove of the first concave portion 34 of the rod-shaped plunger 3 and the first convex portion 44 of the dispensing amount setting member 4 is the same as that of the first concave portion of the rod-shaped plunger 3. It is preferable that the depth is smaller than the depth of the threaded portion 32 or the groove of the second threaded portion 43 of the dosage setting member. By doing so, a good click mechanism can be formed.

Next, another embodiment of the drug fixed amount dispenser 1 of the present invention shown in FIG. 12 will be described. FIG. 12 is a partially enlarged vertical sectional view of the vicinity of the fitting portion in another embodiment of the present invention. The difference between the embodiment of the present invention shown in FIG. 12 and the embodiment of the present invention shown in FIG. 1 is that, as shown in FIG. 12, the piston 11 and the tip 31 of the rod-shaped plunger 3 are respectively , The second concave portion 11a and the second convex portion 35 are not provided, and the rod-shaped plunger 3 is provided inside the rear end of the cylindrical housing 2 as a back-back prevention member and a rotation-prevention member for the rod-shaped plunger 3 which replaces them. That is, the rubber member 8 that surrounds and presses is attached. Then, as shown in FIG. 12, it is preferable that the rubber member 8 has plunger pressing portions 8a and 8b that are housed inside the rubber member 8 when the rod-shaped plunger 3 is inserted. By forming in this way, rotation and backward movement of the plunger 3 can be further prevented.

Next, another embodiment of the drug quantitative dispensing device 1 of the present invention shown in FIGS. 13 and 14 will be described. 13 is a vertical sectional view of a plunger rotation preventing member according to another embodiment of the present invention, and FIG. 14 is a sectional view taken along line FF of FIG. The difference between the drug metered-dose dispenser 1 of this embodiment and the embodiment shown in FIG. 1 is that the piston 11 and the tip portion 31 of the rod-shaped plunger 3 respectively have a second concave portion 11a and a second convex portion. As an anti-rotation member for the rod-shaped plunger 3 that does not have the valve 35, the first portion of the rod-shaped plunger 3 as shown in FIGS. 13 and 14 is provided inside the rear end of the cylindrical housing 2. The point is that the rod-shaped plunger rotation stopping member 7 having the third convex portion 71 that engages with the concave portion 34 is attached. Therefore, in this embodiment, since the third convex portion 71 and the first concave portion 34 are engaged with each other, the rod-shaped plunger 3 can be prevented from rotating with the rotation of the dose setting member 4.

[0025]

[Action]

 Next, the operation when using the drug quantitative dispensing device 1 of the present invention will be described with reference to FIGS. 1, 15, 16 and 17. FIG. 1 shows a state before using the drug quantitative dispensing device 1 of the present invention, in which the first and second drug dispensing amount instructing sections 42 and 56 both indicate a dispensing amount of 0. ing. Then, the dispensing amount setting member moving cap 5 is gripped, and the dispensing amount setting is performed while confirming the dispensing amount on the first medicine dispensing amount instructing section 42 and the first medicine dispensing amount display section 52. The member moving cap 5 is rotated in the X direction of FIG. At this time, the dispensing amount setting member 4 rotates together with the dispensing amount setting member moving cap 5 and moves on the rod-shaped plunger 3 in the axial rear end direction by a distance corresponding to the set dispensing amount. Moving. FIG. 15 shows the state after this setting, in which the first medicine dose instructing section 42 instructs around 30 unit, and the second medicine dose instructing section 56 instructs 8 unit. ing. That is, FIG. 15 shows a state in which 28 units are set to be distributed. As described above, the dispensing amount setting operation in the drug fixed amount dispensing device 1 of the present invention is only the rotation of the dispensing amount setting member moving cap 5 and is extremely easy as compared with the conventional dispensing device. Next, the dispensing amount setting member moving cap 5 is removed from the tubular housing 2. This state is shown in FIG. 16, in which the dose setting member 4 moves in the axial direction of the rod-shaped plunger 3 by the same distance as the moving distance of the piston 11 required to administer the set dose. It is moving toward the rear end. Further, after removing the needle holder 14 and the needle cap 13 and puncturing the patient with the injection needle 12, when the pressing portion 33 at the rear end of the rod-shaped plunger 3 is pressed, the plunger 3 moves in the distal direction of the housing 2. Then, the tip portion 31 presses the piston 11, and a set dose of the drug is discharged from the needle tip and administered to the patient. The state after this drug dispensing is shown in FIG. After the administration, the needle cap 13 and the needle holder 14 are attached again. Further, when the dose of the medicine is fixed, the stopper 6 is moved in the axial direction in the window portion 51 and locked at a predetermined amount position, so that the setting operation of the dose is easier. Can be something. That is, the setting operation of the dispensing amount is only performed by rotating the cap 5 for moving the dispensing amount setting member 4 until the stopper 6 prevents the movement of the dispensing amount setting member 4 in the axial rear end direction. Becomes The drug fixed amount dispenser 1 may be disposable until the drug in the drug cartridge 10 housed therein runs out.

[0026]

[Effect of the device]

 The drug dispensing device of the present invention has a drug cartridge housing part for housing a drug cartridge having a drug and a slidable piston, a cylindrical housing having a rear end opened, and the drug cartridge described above. It has a tip portion for pushing the piston, a first screw portion formed on the outer peripheral surface, and a pushing portion provided at the rear end, and is inserted into the cylindrical housing through the rear end opening. A rod-shaped plunger, a first engagement portion attached to the rod-shaped plunger and formed on the outer peripheral surface, and a first medicine dosage instructing portion provided in the first engagement portion. A second screw portion screwed to the first screw portion of the rod-shaped plunger formed on the inner peripheral surface, and the first screw portion and the second screw portion are screwed to each other, and A dispensing amount setting member movable in the axial direction of the rod-shaped plunger; A window extending in the axial direction is provided around the jar and the dose setting member so that the drug dose indicating part of the dose setting part can be seen from the outside, and the window is provided around the window. A first medicine dispensing amount display portion, and a second engaging portion formed on the inner peripheral surface, engaged with the first engaging portion of the dispensing amount setting member, and extending in the axial direction. And a cylindrical dispensing amount setting member moving cap for moving the dispensing amount setting member in the axial direction of the rod-shaped plunger by rotating the same. In addition to being smaller in size, it is possible to easily set the drug dosage.

[Brief description of drawings]

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

FIG. 2 is a vertical cross-sectional view of the drug fixed amount dispenser 1 shown in FIG.

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

4 is a sectional view taken along line BB of FIG.

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

FIG. 6 is a partially enlarged cross-sectional view of the vicinity of a stopper 6 attachment portion of the drug quantitative dispensing device 1 shown in FIG.

FIG. 7 is a cross-sectional view of the vicinity of a fitting portion according to another embodiment of the present invention.

FIG. 8 is a partially enlarged view of a rod-shaped plunger according to another embodiment of the present invention.

9 is a sectional view taken along line DD of FIG.

FIG. 10 is a vertical cross-sectional view of a dispensing amount setting member according to another embodiment of the present invention.

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

FIG. 12 is a partially enlarged vertical sectional view of the vicinity of a fitting portion in another embodiment of the present invention.

FIG. 13 is a vertical sectional view of a plunger rotation preventing member according to another embodiment of the present invention.

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

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

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

FIG. 17 is an explanatory view for explaining the operation of the drug quantitative dispensing device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 drug dispenser 2 cylindrical housing 3 rod-like plunger 4 dose setting member 5 cap for moving dose setting member 6 stopper 7 plunger rotation prevention member 8 rubber member 8a pressure contact part 8b pressure contact part 10 drug cartridge 11 Piston 11a 2nd recessed part 12 Injection needle 13 Needle cap 14 Needle holder 15 Rubber stopper 21 Drug cartridge storage part 22 Fitting part 23 1st convex part or recessed part 23a Slit 23b Slit 24 2nd drug dosage indication part 25 Second concave portion or convex portion 26 Remaining medicine amount display portion 31 Tip portion 32 First screw portion 33 Pressing portion 34 First concave portion 35 Second convex portion 41 First engaging portion 42 First medicine dispensing Amount indication part 43 Second screw part 44 First convex part 51 Window part 52 First drug dose display part 53 Second engaging part 54 First concave part Or protrusions 55 second projections or recesses 55a slits 55b slits 56 second agent dispensing amount instruction section 71 third protrusion

Claims (1)

[Scope of utility model registration request] 1. A cylindrical housing having a drug cartridge housing portion for housing a drug cartridge having a drug and a slidable piston and having a rear end opened, and a tip of the drug cartridge for pressing the piston. A rod-shaped plunger inserted into the tubular housing through the rear end opening, the rod-shaped plunger having a first screw portion formed on the outer peripheral surface, and a pressing portion provided at the rear end. A first engaging portion attached to the plunger and formed on the outer peripheral surface, and a first engaging portion provided on the first engaging portion.
And a second screw portion that is screwed onto the first screw portion of the rod-shaped plunger formed on the inner peripheral surface of the medicine dispensing amount instruction portion, and the first screw portion and the second screw portion. The dispensing amount setting member that is movable in the axial direction of the rod-shaped plunger by screwing the screw portion, and the rod-shaped plunger and the dispensing amount setting member are surrounded, and the medicine amount of the dispensing amount setting member is An axially extending window portion that allows the dosage indicating portion to be visually recognized from the outside, a first medicine dosage display portion provided around the window portion, and an inner peripheral surface formed to set the dosage amount. A second engaging portion that engages with the first engaging portion of the member and extends in the axial direction, and rotates the dispensing amount setting member in the axial direction of the rod-shaped plunger. And a cylindrical dispensing amount setting member moving cap that is moved to the inside of the container.