Drug Injection Device

Abstract

To provide a medicine injection tool that enables efficient application of medicine to a wide range inside a body cavity such as a vagina and an anus.SOLUTION: A medicine injection tool for injecting flowable medicine into a body comprises: a long-sized insertion part to be inserted into the body; a storage part in which flowable medicine is stored; and a medicine flow passage part, formed inside the insertion part, through which flowable medicine pushed out from the storage part is led. The medicine flow passage part is formed along a longer direction of the insertion part. The long-sized insertion part has a plurality of medicine discharge holes making the medicine flow passage part communicate with the outside. A hole diameter of each of the medicine discharge holes increases in stages as it goes toward a flow-down direction of flowable medicine circulating in the medicine flow passage part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a drug injection device, and more particularly to a drug injection device for injecting a fluid drug into a body. [Background technology]

[0002] Recently, various fluid medicines are often injected into the human body for various purposes. For example, a cleaning liquid for washing a woman's genitals is injected into the genitals, a contraceptive liquid for contraception, a medicinal liquid for treating hemorrhoids and sexually transmitted diseases, and so on. The applications are very diverse.

[0003] The inside of the genitals and anus of the human body are exposed mucous membranes, which are very sensitive to external stimuli and are easily damaged or contaminated, so great care must be taken when administering the various fluid drugs mentioned above.

[0004] In the past, in order to improve the inconvenience of directly administering the above-mentioned fluid medicine manually, a drug injection device capable of administering the fluid medicine into the human body has been devised. For example, as disclosed in Patent Document 1, such a drug injection device is equipped with a plastic cylinder with a drug discharge hole formed at the tip, and a push rod (piston) provided in the cylinder is pushed toward the tip of the cylinder, so that the fluid medicine flows out from the drug discharge hole provided at the tip of the cylinder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-004309 A Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, conventionally known drug injection devices have a structure in which a fluid drug is discharged from the tip of a cylinder, and therefore, while there is no particular problem from the viewpoint of simply injecting a drug into a body cavity such as the vagina or anus, there is a problem in that it is difficult to apply the drug to a wide area inside the body cavity. In particular, when injecting a relatively viscous gel or jelly-like drug, the injected gel-like drug has a strong tendency to remain in the area near the tip of the cylinder, making it practically difficult to quickly apply the drug to a wide area inside the body cavity such as the vagina or anus.

[0007] The present invention has been made to solve these problems, and has an object to provide a drug injection device that can efficiently apply a drug to a wide area inside a body cavity such as the vagina or anus. [Means for solving the problem]

[0008] The above object of the present invention is to provide a medicine injection device for injecting a fluid medicine into a vagina or anus, the medicine injection device comprising: a long insertion portion to be inserted into a vagina or anus; a storage portion in which the fluid medicine is stored; and a medicine flow path portion formed inside the insertion portion and into which the fluid medicine pushed out from the storage portion is guided, the medicine flow path portion being formed along the longitudinal direction of the insertion portion, the long insertion portion being provided with a plurality of medicine ejection holes communicating with the medicine flow path portion and the outside, the hole diameter of each of the medicine ejection holes being gradually increased along the flow direction of the fluid medicine flowing through the medicine flow path portion, and the plurality of medicine ejection holes being located on a first imaginary line along the longitudinal direction of the insertion portion as is assumed on a surface of the insertion portion. The device is provided with a first discharge hole group consisting of a plurality of medicine discharge holes arranged at regular intervals, and a second discharge hole group consisting of a plurality of medicine discharge holes arranged at regular intervals on a second imaginary line different from the first imaginary line and along an assumed longitudinal direction of the insertion portion on a surface of the insertion portion, wherein each medicine discharge hole in the first discharge hole group and each medicine discharge hole in the second discharge hole group are formed at opposing positions on both sides of the medicine flow path, each medicine discharge hole in the first discharge hole group and each medicine discharge hole in the second discharge hole group are alternately arranged along the longitudinal direction of the insertion portion, and the insertion portion has an elliptical cross section perpendicular to the longitudinal direction over the entire longitudinal direction. At least some of the medicine ejection holes are formed in a side surface portion in a minor axis direction of the insertion portion having the elliptical cross section. This object is achieved by a drug injection device characterized by comprising:

[0009] In this medicine injection device, the medicine ejection holes may be arranged at predetermined intervals along the longitudinal direction of the insertion portion.

[0010] Also ,before At least some of the plurality of medicine ejection holes may be formed in a side surface portion in a minor axis direction of the insertion portion having an elliptical cross section. Effect of the Invention

[0014] According to the present invention, it is possible to provide a drug injection device that can efficiently apply a drug to a wide area inside a body cavity such as the vagina or anus. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic perspective view of a first embodiment of a pharmaceutical injection device according to the present invention. [Diagram 2] FIG. 1 is a schematic cross-sectional view showing a cross section along the longitudinal axis of a pharmaceutical injection device according to a first embodiment. [Diagram 3] FIG. 3 is a side view of the pharmaceutical injection device as seen from the direction of the arrow A in FIG. 2. [Figure 4] FIG. 2 is a bottom view of the pharmaceutical injection device according to the first embodiment. [Diagram 5] 1(a) and 1(b) are enlarged cross-sectional views of essential parts illustrating the action of the pharmaceutical injection device according to the first embodiment. [Figure 6] FIG. 2(a) is an enlarged side view of a main portion of a storage container included in a pharmaceutical injection device according to a first embodiment, and (b) is an enlarged cross-sectional view of a main portion of an outer member. [Figure 7] FIG. 2 is an enlarged cross-sectional view of a main portion for explaining the operation of the pharmaceutical injection device according to the first embodiment. [Figure 8] FIG. 11 is a schematic perspective view of a second embodiment of a pharmaceutical injection device according to the present invention. [Figure 9] FIG. 11 is a schematic cross-sectional view showing a cross section along the longitudinal axis of a pharmaceutical injection device according to a second embodiment. [Figure 10] 10 is a schematic cross-sectional view showing the cross section BB of FIG. 9. [Figure 11] FIG. 13(a) is a cross-sectional view of a storage container provided in a pharmaceutical injection device according to a second embodiment, and (b) is a cross-sectional view of an insertion portion. [Figure 12] FIG. 11 is an enlarged cross-sectional view of a main portion illustrating the open end of a drug flow path section provided in a drug injection device according to a second embodiment. [Figure 13] FIG. 11 is a plan view of the pharmaceutical injection device as seen from the direction of the arrow C in FIG. [Figure 14]FIG. 11 is an explanatory diagram illustrating a modified example of the pharmaceutical injection device according to the second embodiment. [Figure 15] FIG. 15 is an explanatory diagram illustrating a further modified example of the pharmaceutical injection device shown in FIG. [Figure 16] FIG. 11 is a schematic perspective view of a third embodiment of a pharmaceutical injection device according to the present invention. [Figure 17] FIG. 11 is a schematic cross-sectional view showing a cross section along the longitudinal axis of a pharmaceutical injection device according to a third embodiment. [Figure 18] 18 is a bottom view of the pharmaceutical injection device as seen from the direction of the arrow E in FIG. 17. [Figure 19] FIG. 13 is another schematic perspective view of the pharmaceutical injection container according to the third embodiment. [Figure 20] FIG. 13(a) is a cross-sectional view of an insertion section and a storage container housing section provided in a pharmaceutical injection device according to a third embodiment, and (b) is a side view of the insertion section and the storage container housing section. [Figure 21] FIG. 11 is a cross-sectional view of a holder portion included in a pharmaceutical injection device according to a third embodiment. [Figure 22] FIG. 11 is an explanatory diagram illustrating the operation of a pharmaceutical injection device according to a third embodiment. [Diagram 23] FIG. 11 is an explanatory diagram illustrating the operation of a pharmaceutical injection device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] A first embodiment of a pharmaceutical injection device according to the present invention will now be described with reference to the accompanying drawings. Fig. 1 is a schematic perspective view of a pharmaceutical injection device 100 according to a first embodiment of the present invention, and Fig. 2 is a schematic cross-sectional view showing a cross section along the longitudinal axis of the pharmaceutical injection device 100. Fig. 3 is a side view seen from the direction of arrow A in Fig. 2. Note that each figure is partially enlarged or reduced in order to make the configuration easier to understand.

[0017] The drug injection device 100 according to the first embodiment of the present invention is a device for injecting a fluid drug into a body cavity (inside the body), such as the vagina or anus. A wide variety of drugs can be used as the fluid drug, including, for example, cleansers, contraceptives, anesthetics, enemas, antipyretics, lubricants, etc. The fluid drug can take various forms, such as lotion, gel, jelly, etc.

[0018] As shown in Figures 1 and 2, this pharmaceutical injection device 100 is configured as a syringe-type injection device comprising an insertion portion 1 and a piston 2. The insertion portion 1 is inserted from its tip end side 1a into a body cavity (inside the body) such as the vagina or anus of the human body, and is formed in an elongated shape that extends along the direction of insertion into the body. This insertion portion 1 has a double structure comprising a storage container 3 and an outer member 4. Here, the storage container 3 and outer member 4 constituting the insertion portion 1, as well as the piston 2, are preferably formed from a plastic resin raw material.

[0019] The storage container 3 is an elongated container having a storage section 5 in which the fluid medicine is stored, and includes a cylindrical elongated body section 6 having a circular cross section and a finger hook section 7. An outflow hole 8 through which the fluid medicine stored in the storage section 5 can flow out is formed at the tip of the storage container 3 (body section 6). The storage container 3 also includes an opening 9 on the base end side (the side where the finger hook section 7 is provided) that communicates with the storage section 5 formed inside. The base end side of the storage container 3 means the end side opposite to the tip end side 1a of the insertion section 1 (storage container 3) that is inserted into the body, and the opening 9 is formed at the other end 1b of the insertion section 1. A piston 2 that is inserted into the storage section 5 through the opening 9 is connected to the storage container 3. By pushing this piston 2 from the other end side 1b of the insertion portion 1 to the tip side 1a, it is possible to push the fluid medicine stored in the storage portion 5 out to the outflow hole 8 side (the tip side 1a of the insertion portion 1).

[0020] The finger hook 7 of the storage container 3 is formed in a tapered shape on the base end side of the storage container 3, expanding in diameter from the tip end side to the base end side. The tapered finger hook 7 is formed so that the cross section perpendicular to the longitudinal direction of the storage container 3 (insertion part 1) is elliptical. A recess 10 is formed on the end face of the tapered part (the base end face of the storage container 3), and is configured so that the rear end 11 of the piston 2 can be stored in the recess 10. The depth of the recess 10 is preferably formed deep enough to completely store the rear end 11 of the piston 2. The shape of the opening edge of the recess 10 is elliptical, as shown in the bottom view of FIG. 4.

[0021] The outer member 4 is a long cylindrical member that covers the tip of the long storage container 3 and the side region connected to the tip. The length of the outer member 4 is preferably set in the range of 50 mm to 100 mm, for example, when the drug injection device 100 is configured for washing the inside of the vagina. The tip of the outer member 4 is formed in a dome shape with a smooth curved surface so that the user does not feel pain when inserted into the body. One end of the cylindrical member is closed by the dome-shaped tip of the outer member 4. A gap 12 is formed between the outer peripheral surface of the storage container 3 and the inner peripheral surface of the outer member 4 at a predetermined interval, into which the fluid drug flowing out from the outflow hole 8 can flow. The gap 12 constitutes a drug flow path portion into which the fluid drug pushed out from the storage portion 5 through the outflow hole 8 formed in the tip of the storage container 3 is guided. This gap 12 (drug flow path portion) is formed inside the insertion portion 1 along the longitudinal direction of the insertion portion 1 so as to surround a portion of the circumferential surface of the storage container 3. In this embodiment, the gap 12 is formed in the region indicated by S in Fig. 2, that is, in the region from the tip to the central portion of the insertion portion 1 as viewed in the longitudinal direction of the insertion portion 1. More specifically, for example, when the pharmaceutical injection device 100 is configured for use in vaginal cleansing, it is preferable to form the gap 12 (drug flow path portion) in a region extending from the tip of the insertion portion 1 along the longitudinal direction of the insertion portion 1 to a dimension in the range of approximately 30 mm to 60 mm.

[0022] Further, the outer member 4 is provided with a plurality of drug ejection holes 13 that communicate between the gap 12 (drug flow path) and the outside. That is, the side surface of the insertion portion 1 is configured to have a plurality of drug ejection holes 13 that communicate with the drug flow path. By providing such drug ejection holes 13, the fluid drug stored in the storage portion 5 is guided to the outside of the insertion portion 1 through the outflow hole 8, the gap 12 (drug flow path), and the drug ejection holes 13 as the piston 2 is pushed in. The range in which the drug ejection holes 13 are arranged is preferably set to a region from the tip to the center of the outer member 4 in the longitudinal direction of the insertion portion 1. More specifically, for example, when the drug injection device 100 is configured for washing the inside of the vagina, it is preferable to form a plurality of drug ejection holes 13 in a region that is about 30 mm to 60 mm from the tip of the outer member 4 along the longitudinal direction of the insertion portion 1.

[0023] Each drug discharge hole 13 is arranged at a predetermined interval along the longitudinal direction of the insertion part 1. In this way, by providing a plurality of drug discharge holes 13 on the side part of the insertion part 1, it becomes possible to quickly apply the drug to a wide area inside the body cavity such as the vagina or anus. In addition, when the injection of the fluid drug into the body is completed and the insertion part 1 is pulled out from the body, the surface of the pulled out insertion part 1 can spread the fluid drug discharged into the body, and the drug can be quickly applied to a wider area inside the body cavity such as the vagina or anus. In addition, the surface of the pulled out insertion part 1 becomes moist with the fluid drug attached thereto, so that the pain given to the user when the insertion part 1 is pulled out from the body can be alleviated.

[0024] In this embodiment, the multiple medicine ejection holes 13 are configured to include a first ejection hole group 14 consisting of multiple medicine ejection holes 13 arranged at predetermined intervals on a first imaginary line along the longitudinal direction of the insertion portion 1 as imagined on the surface of the insertion portion 1, and a second ejection hole group 15 consisting of multiple medicine ejection holes 13 arranged at predetermined intervals on a second imaginary line different from the first imaginary line and along the longitudinal direction of the insertion portion 1 as imagined on the surface of the insertion portion 1. By configuring the positional relationship of the medicine ejection holes 13 in this way, it becomes possible to effectively and quickly apply the medicine to a wide area inside a body cavity such as the vagina or anus.

[0025] Moreover, it is preferable that each of the medicine ejection holes 13 in the first ejection hole group 14 and each of the medicine ejection holes 13 in the second ejection hole group 15 are formed on both sides of the storage section 5. Here, in this embodiment, the gap section 12 (medicine flow path section) is provided surrounding the periphery of the storage section 5, so that each of the medicine ejection holes 13 in the first ejection hole group 14 and each of the medicine ejection holes 13 in the second ejection hole group 15 are formed on both sides of the gap section 12 (medicine flow path section). By employing such a configuration, it becomes possible to apply the medicine to the inside of a body cavity such as the vagina or anus over a wider range.

[0026] 2, it is preferable that each of the medicine ejection holes 13 in the first ejection hole group 14 and each of the medicine ejection holes 13 in the second ejection hole group 15 are arranged in a staggered positional relationship along the longitudinal direction of the insertion section 1. This configuration also contributes to applying the medicine to a wider area inside a body cavity such as the vagina or anus.

[0027] In this embodiment, the hole diameter of each medicine ejection hole 13 is the same, but for example, the hole diameter of each medicine ejection hole 13 may be gradually increased in the flow direction of the fluid medicine flowing through the gap 12 (medicine flow path portion). When such a configuration is adopted, in this embodiment, the fluid medicine is ejected from each medicine ejection hole 13 while flowing down the gap 12 (medicine flow path portion) from the tip end side to the other end side of the insertion part 1, so that the hole diameters are gradually increased in the order of medicine ejection hole 13a, medicine ejection hole 13b, medicine ejection hole 13c, and medicine ejection hole 13d. If the hole diameter of all the drug ejection holes 13 were made the same, there was a risk that the fluid drug would be difficult to eject from the drug ejection holes 13d located downstream of the gap 12 (drug flow path section) due to the effects of pressure loss. However, as described above, by making the hole diameter of each drug ejection hole 13 gradually larger in the downstream direction of the fluid drug flowing through the gap 12 (drug flow path section), it is possible to maintain a uniform amount of the fluid drug ejected from each drug ejection hole 13, and it is possible to evenly apply the fluid drug over a wide area inside a body cavity such as the vagina or anus.

[0028] Here, as shown in the enlarged cross-sectional view of the main part in FIG. 5, the storage container 3 and the outer member 4 are configured to be relatively movable along the longitudinal direction of the insertion part 1, and are configured to be able to transition from a first state in which the tip of the storage container 3 and the tip of the outer member 4 are close to each other to a second state in which the tip of the storage container 3 and the tip of the outer member 4 are separated from each other. FIG. 5(a) shows the first state, and FIG. 5(b) shows the second state. Note that FIG. 2 above shows the first state. In addition, the outer member 4 is configured to include a drug leakage prevention part 16 that blocks the outflow hole 8 provided at the tip of the storage container 3 in the first state in which the tip of the storage container 3 and the tip of the outer member 4 are close to each other. This drug leakage prevention part 16 is configured to release the blocking state of the outflow hole 8 provided at the tip of the storage container 3 in the second state, that is, in a state in which the tip of the storage container 3 and the tip of the outer member 4 are separated from each other by a predetermined distance. By releasing the blocked state of the outflow hole 8, the reservoir 5 and the gap 12 (medicinal flow path portion) are brought into communication with each other via the outflow hole 8.

[0029] The drug leakage prevention part 16 is provided on the inner surface of the tip of the outer member 4. In this embodiment, the drug leakage prevention part 16 has a protruding end 17 that protrudes toward the tip of the storage container 3, and is configured so that in the first state, the protruding end 17 is inserted into the opening of the outflow hole 8 to block the outflow hole 8. The outer peripheral surface of the protruding end 17 is configured to be in sliding contact with the inner peripheral surface of the outflow hole 8. Since the opening edge of the outflow hole 8 is usually formed in a circular shape, it is preferable that the protruding end 17 is configured as a solid rod-shaped body or a cylindrical body that is circular in cross section and whose outer peripheral surface is in close contact with the opening edge of the outflow hole 8. In this embodiment, the protruding end 17 is formed as a cylindrical body, and is configured to be able to accommodate the tip of the piston 2 inside.

[0030] By providing such drug leakage prevention section 16, for example, by setting the positional relationship between storage container 3 and outer member 4 to the first state at the stage of distributing drug injection device 100 on the market, it is possible to effectively prevent the fluid drug in storage section 5 from leaking out of insertion section 1 during the distribution process. On the other hand, when drug injection device 100 is handed over to a user and the user actually uses it, the user can change the positional relationship between storage container 3 and outer member 4 to the second state by operating the drug injection device, which allows the user to recognize that the drug injection device 100 is unused and that the fluid drug is clean and has not come into contact with the outside air, providing a sense of security when using the device.

[0031] In addition, as a specific structure that enables the relative movement of the storage container 3 and the outer member 4 along the longitudinal direction of the insertion part 1, for example, as shown in the enlarged side view of the main part of the storage container 3 in FIG. 6(a) and the enlarged cross-sectional view of the main part of the outer member 4 in FIG. 6(b), it is possible by forming a male screw part 18 on the outer peripheral surface of the storage container 3 and forming a female screw part 19 that screws into the male screw part 18 on the inner peripheral surface of the outer member 4. Note that FIGS. 6(a) and 6(b) correspond to the region indicated by T in FIG. 2. With such a structure, by rotating the outer member 4 with respect to the storage container 3, for example, by 180 degrees, the storage container 3 and the outer member 4 move relative to each other along the longitudinal direction of the insertion part 1, and it is possible to change the positional relationship between the storage container 3 and the outer member 4 so as to be in the first state and the second state described above.

[0032] Furthermore, in this embodiment, in a second state in which the blockage of the outflow hole 8 by the drug leakage prevention section 16 is released due to relative movement between the storage container 3 and the outer member 4 along the longitudinal direction of the insertion section 1, a restricting means 20 is provided that restricts the relative movement of the outer member 4 with respect to the storage container 3. By providing such a restricting means 20, it is possible to effectively prevent the outer member 4 from coming off the storage container 3. It is also possible to effectively prevent the positional relationship between the storage container 3 and the outer member 4 from returning from the second state, which is a usable state, to the first state (unusable state), which effectively prevents the user from accidentally reusing or recycling a used drug injection device 100.

[0033] Various configurations can be adopted for this regulating means 20, and for example, it is configured to include an outer engagement portion formed in the outer member 4 and a container fitting portion provided on the outer surface of the storage container 3. More specifically, in this embodiment, the outer engagement portion is configured as a through hole formed in the outer member 4, and the container fitting portion is configured as a protrusion protruding from the outer surface of the storage container 3. When the positional relationship between the storage container 3 and the outer member 4 is in a first state, the container fitting portion configured as a protrusion is in contact with the inner circumferential surface of the outer member 4, but when it becomes a second state, the protruding container fitting portion fits into the outer engagement portion as a through hole formed in the outer member 4, and the rotation (relative movement) of the outer member 4 with respect to the storage container 3 is regulated. Although the outer member 4 and the storage container 3 are made of a relatively hard plastic material, they are both configured as cylindrical bodies and therefore slightly elastically deformable, so that the container fitting portion configured as the protrusion does not hinder the rotation of the outer member 4 relative to the storage container 3 during the transition from the first state to the second state. Furthermore, the restricting means 20 may be configured as a structure in which a recess is formed in the surface of the storage container 3, a leaf spring structure is provided connected to the edge of the recess, and a protrusion is formed on the leaf spring structure, so that the protrusion is housed in the recess when the protrusion is in contact with the inner circumferential surface of the outer member 4 (first state).

[0034] In the above example, the outer engagement portion is configured as a through hole formed in the outer member 4, but it is not necessarily required to penetrate through the outer member 4, and the outer engagement portion may be configured as a recessed portion formed in the inner circumferential surface of the outer member 4. In the above embodiment, the outer engagement portion is configured as a through hole formed in the outer member 4, and the container fitting portion is configured as a protrusion protruding from the outer surface of the storage container 3, but the configuration is not particularly limited to this. For example, the outer engagement portion may be configured as a protrusion protruding from the inner circumferential surface of the outer member 4, the container fitting portion is configured as a recessed portion formed in the outer surface of the storage container 3, and the outer engagement portion, which is a protrusion, may be fitted into the container fitting portion, which is a recessed portion, to restrict the relative movement of the outer member 4 with respect to the storage container 3 when transitioning to the second state.

[0035] In this embodiment, the rear end 11 of the piston 2 is formed so as to be irreversibly stored in a recess 10 formed at the other end of the insertion portion 1 (in a recess 10 formed at the base end face of the storage container 3). With this configuration, as shown in the enlarged cross-sectional view of the main part of FIG. 7, the rear end 11 of the piston 2 is stored in the recess 10, and after the discharge of the fluid medicine stored in the drug injection device 100 is completed, it is possible to make it difficult to pull out the piston 2. This makes it possible to effectively prevent the drug injection device 100 from being reused or recycled. In addition, since it is possible to prevent the return of the piston 2 (movement in the opposite direction to the extrusion direction), it is possible to effectively prevent the fluid medicine injected into the body from flowing back into the insertion portion 1 through the drug discharge hole 13 when the pressure inside the storage portion 5 becomes negative due to the return of the piston 2.

[0036] Here, as a specific configuration for irreversibly storing the rear end 11 of the piston 2 in the recess 10 formed on the other end side 1b of the insertion part 1, for example, as shown in the enlarged cross-sectional view of the main part in FIG. 7, the recess 10 is configured to have an engagement protrusion 21 protruding from its inner circumferential surface toward the inside of the recess 10, and the rear end 11 of the piston 2 is configured to have a piston fitting part 22 that fits with the engagement protrusion 21. In this embodiment, the engagement protrusion 21 is formed in a dome shape that protrudes from the inner circumferential surface near the opening edge of the recess 10 toward the inside of the recess 10. In addition, the piston fitting part 22 is formed on the periphery of the rear end 11 of the piston 2 and has a claw part 23 that protrudes outward from the rear end 11. The claw part 23 is formed around the entire periphery of the rear end 11 of the piston 2. When the rear end 11 of the piston 2 enters the recess 10, the piston fitting portion 22 formed on the rear end 11 of the piston 2 climbs over the engaging protrusion 21 while deforming the finger hook portion 7 in a direction that slightly expands the diameter of the opening edge 26 of the recess 10. After the piston fitting portion 22 climbs over the engaging protrusion 21, the opening edge 26 of the recess 10, which has been slightly expanded and deformed, elastically recovers and returns to its original shape, so that the piston fitting portion 22 can no longer climb over the engaging protrusion 21 in the opposite direction.

[0037] In this way, by fitting the piston fitting portion 22 with the engaging projection 21, the rear end portion 11 of the piston 2 is irreversibly stored in the recess 10 formed at the other end portion of the insertion portion 1, which not only prevents reuse of the drug injection device 100 and prevents backflow of the fluid drug, but also makes it possible to clearly inform the user of the final position of the amount of thrust of the piston 2. More specifically, a sound is generated when the piston fitting portion 22 and the engaging projection 21 are fitted together, and this sound can be used to inform the user that the piston 2 does not need to be pushed any further. In addition, since the vibration generated when the piston fitting portion 22 and the engaging projection 21 are fitted together is directly transmitted to the fingers, even if the user does not hear the sound, the final position of the amount of thrust of the piston 2 can be informed through the vibration of the fingers.

[0038] 7, the piston fitting portion 22 is preferably configured to have an inclined surface 24 that guides the engaging projection 21 that fits into the piston fitting portion 22. The inclined surface 24 is formed closer to the tip end of the piston 2 than the tip claw portion 23 of the piston fitting portion 22. By providing such an inclined surface 24, it becomes possible to smoothly insert the rear end portion 11 of the piston 2 into the recess 10.

[0039] In addition, it is preferable that the rear end surface 25 of the rear end 11 of the piston 2 and the opening edge 26 of the recess 10 are flush with each other so that the rear end 11 of the piston 2 can be stored in the recess 10. By adopting such a configuration, it is possible to more clearly inform the user of the final position of the amount of pushing of the piston 2. In other words, when the rear end 11 of the piston 2 is pressed to proceed with the injection of the fluid medicine, the state in which the opening edge 26 of the recess 10 and the rear end 11 of the piston 2 are flush with each other can be recognized by the sensation on the pad side of the finger, and it is possible to inform the user that it is not necessary to press the piston 2 any further. In addition, by configuring the rear end surface 25 of the rear end 11 of the piston 2 and the opening edge 26 of the recess 10 to be flush with each other so that the rear end 11 of the piston 2 can be stored in the recess 10, it is possible to effectively prevent the engagement between the rear end 11 of the piston 2 and the recess 10 from being released due to some external force acting on the rear end 11 of the piston 2, and it is possible to effectively suppress the reuse and re-use of the medicine injection device 100.

[0040] 4, the installation position of the engaging projection 21 is preferably a position corresponding to the minor axis of the elliptical recess 10. The number of combinations of the fitting structures between the piston fitting portion 22 and the engaging projection 21 is not particularly limited, and the structure may include one combination, or two or more combinations.

[0041] In the above embodiment, the shape of the opening edge 26 of the recess 10 is configured to have an elliptical shape as shown in the bottom view of Fig. 4, but is not particularly limited to such a configuration and may be configured to be circular. In addition, the outline of the rear end 11 of the piston 2 is also configured to have a circular shape as shown in Fig. 4 in the above embodiment, but is not particularly limited to such a configuration and may be formed into an elliptical shape similar to the shape of the opening edge 26 of the recess 10.

[0042] In addition, in the above embodiment, both the storage container 3 and the outer member 4 are configured to have a cylindrical portion that is circular in cross section along their longitudinal direction, but are not particularly limited to such a configuration, and may be configured, for example, to have a cylindrical portion that is elliptical in cross section along their longitudinal direction.

[0043] As described above, the drug injection device 100 according to the first embodiment of the present invention has been described as having a configuration in which the storage section 5 and the drug flow path section 12 (void section) are clearly separated. However, the present invention includes a configuration in which the storage section 5 and the drug flow path section 12 are combined, as shown in FIG. 3 of the above-mentioned Patent Document 1 (JP Patent Publication No. 2014-004309), for example, in which the storage section (corresponding to the storage space S in Patent Document 1) in which the fluid drug is stored functions as the drug flow path section. Specifically, for example, the insertion section 1 may be configured to include a storage container 3 having an outer shape suitable for insertion into the human body, omitting the outer member 4, and a drug discharge hole 13 communicating with the outside may be formed in a side portion of the storage container 3. When the drug injection device 100 is configured in this manner, the storage section 5 and the drug flow path section 12 are not clearly distinguished, and the storage section 5 and the drug flow path section 12 are combined.

[0044] Next, a second embodiment of a drug injection device 200 according to the present invention will be described with reference to the accompanying drawings. Fig. 8 is a schematic perspective view of the configuration of a drug injection device 200 according to the second embodiment of the present invention, and Fig. 9 is a schematic cross-sectional view showing a cross section taken along the longitudinal axis of drug injection device 200. Fig. 10 is a schematic cross-sectional view showing cross section BB of Fig. 9. Note that each figure is partially enlarged or reduced to make the configuration easier to understand.

[0045] Similar to the drug injection device 100 according to the first embodiment described above, the drug injection device 200 according to the second embodiment of the present invention is a device for injecting a fluid drug into a body cavity (inside the body), such as the vagina or anus. A wide variety of drugs can be used as the fluid drug, including, for example, cleansers, contraceptives, anesthetics, enemas, antipyretics, lubricants, etc. The fluid drug can take various forms, such as lotion, gel, jelly, etc.

[0046] As shown in Figures 8 to 10, this drug injection device 200 comprises a storage container 31 and an insertion portion 32, and is configured as an injection device of a type in which the peripheral portion of the storage container 31 is grasped and compressed, and the fluid drug inside is expelled from the insertion portion 32 in a squeezing manner.

[0047] The storage container 31 is a flexible container, and includes a storage section 33 in which the fluid medicine is stored. The storage container 31 also includes a mouth section 34 at the tip from which the fluid medicine flows out. The storage container 31 is configured to be connectable to the other end 32b of the insertion section 32 via the mouth section 34. As shown in the cross-sectional view of FIG. 11(a), a top seal 35 that closes the mouth section 34 is adhered to the mouth section 34, and the fluid medicine inside is configured not to flow out through the mouth section 34 when not connected to the insertion section 32. A male screw section 36 is formed on the outer circumferential surface of the mouth section 34. The material constituting the storage container 31 is not particularly limited as long as the storage container 31 itself has flexibility, and is a material that allows the user to grasp and compress and deform the storage container 31 to allow the fluid medicine inside to flow out through the mouth section 34. As the storage container 31, for example, a blow molded tube or an extrusion molded tube using a plastic resin raw material can be suitably used.

[0048] The insertion section 32 is inserted from its tip side 32a into a body cavity (inside the body) such as the vagina or anus of the human body, and is formed in an elongated shape extending along the direction of insertion into the body, as shown in the cross-sectional views of Figs. 9, 10, and 11(b). The length of the insertion section 32 is preferably set in the range of 50 mm to 100 mm, for example, when the pharmaceutical injection device 200 is configured for washing the inside of the vagina. A bulging section 37 is formed at the other end 32b of the insertion section 32. The tip of the insertion section 32 is formed to have a smooth curved surface so that the user does not feel pain when the insertion section 32 is inserted into the body. Moreover, the insertion section 32 is formed as a whole with a curved surface, and is formed so that the cross section is elliptical. Here, the insertion section 32 and the bulging section 37 are preferably formed from a plastic resin material. Moreover, the insertion section 32 and the bulging section 37 are preferably configured by integral molding.

[0049] The insertion section 32 also includes a drug flow path section 38 to which the drug pushed out from the storage section 33 is guided, and a drug discharge hole 43 that communicates between the drug flow path section 38 and the outside. The drug flow path section 38 is formed inside the insertion section 32. The drug flow path section 38 is formed so as to extend along the longitudinal direction of the insertion section 32, and includes an opening end 39 that opens at the other end of the insertion section 32. The end of the drug flow path section 38 opposite to the opening end 39 (the end on the tip side 32a of the insertion section 32) extends to the vicinity of the tip inside the insertion section 32, but is configured not to open at the tip of the insertion section 32. The opening end 39 of the drug flow path section 38 includes at least one or more sharp protrusions 40, and is configured so as to be able to be inserted into the top seal 35 provided at the mouth 34 of the storage container 31. Here, in this embodiment, the drug flow path section 38 is formed so that the axis of the drug flow path section 38 overlaps the axis of the insertion section 32, but this is not limited to such an embodiment, and the drug flow path section 38 may be formed so that the axis of the drug flow path section 38 is positioned at a position that does not overlap the axis of the insertion section 32.

[0050] The other end of the insertion part 32, where the open end 39 of the drug flow path part 38 is provided, is provided with a recess 41 into which the mouth part 34 of the storage container 31 is inserted. The recess 41 is formed such that its depth direction is along the longitudinal direction of the insertion part 32. A female screw part 42 is formed on the inner peripheral surface of the recess 41, and is configured to be able to screw into the male screw part 36 provided on the outer surface of the mouth part 34 of the storage container 31. The open end 39 of the drug flow path part 38 is arranged so as to be exposed as a cylindrical shape within the recess 41 at the center position of the bottom surface of the recess 41.

[0051] As described above, the opening end 39 of the drug flow passage section 38 is configured to have a sharp protrusion 40, but considering the ease of guiding the fluid drug to the drug flow passage section 38, it is preferable that the shape of this protrusion 40 is a bamboo spear shape formed by shaping the tip of the cylindrical protrusion 40 exposed in the recess 41 at an angle, as shown in the enlarged cross-sectional view of the main part in FIG. 12. The bamboo spear-shaped protrusion 40 (opening end 39) is configured so that its sharp direction is along the longitudinal direction of the insertion section 32 (depth direction of the recess 41). The shape of the protrusion 40 is not limited to the bamboo spear shape, and it may be configured as a jagged protrusion provided on the cylindrical opening end 39.

[0052] As described above, by providing the opening end 39 of the drug flow path section 38 with the sharp projection 40, simply by pushing and setting the mouth section 34 of the storage container 31 into the recess 41 formed on the other end side 32b of the insertion section 32, the opening end 39 of the drug flow path section 38 is inserted into the top seal 35 (the opening end 39 breaks through the top seal 35), thereby enabling communication between the storage section 33 and the drug flow path section 38. Furthermore, with this configuration, the user does not need to peel off the top seal 35 provided on the mouth section 34 of the storage container 31 with his or her fingers, and further, it is possible to maintain a sealed state of the storage container 31 in which the fluid drug is stored until the user actually uses the drug injection device 200, so that the drug injection device 200 can be used in a hygienic and preferable state.

[0053] As described above, the other end of the insertion part 32 is formed with a recess 41 into which the mouth 34 of the storage container 31 is inserted, and the inner peripheral surface of the recess 41 is formed with a female screw portion 42 so as to be able to screw with the male screw portion 36 provided on the outer surface of the mouth 34 of the storage container 31. With this configuration, the user places the mouth 34 of the storage container 31 against the opening edge of the recess 41 formed at the other end of the insertion part 32, and then rotates the storage container 31 to advance the screwing of the mouth 34 and the recess 41, and pushes the mouth 34 into the recess 41, breaking through the top seal 35 provided at the mouth 34 with the sharp open end of the drug flow path part 38, thereby connecting the storage container 31 and the insertion part 32 in communication. By thus establishing a communication connection between the storage container 31 and the insertion portion 32 by screwing the recess 41 into the mouth portion 34, it becomes possible to reliably maintain the connection between the storage container 31 and the insertion portion 32.

[0054] Furthermore, by connecting the reservoir 31 and the insertion section 32 by screwing the recess 41 and the mouth section 34, the sharp opening end 39 of the drug flow path section 38 can be inserted gently into the top seal 35, so that the top seal portion broken by the insertion of the opening end 39 is not separated from the top seal portion adhered to the periphery of the mouth section 34, but can be made to hang down in close contact with the periphery of the opening end 39 that has entered the reservoir 33. This makes it possible to prevent a portion of the top seal 35 from separating and falling into the reservoir 33 due to the insertion of the opening end 39, and entering the opening end 39 of the drug flow path section 38 and blocking the drug flow path section 38.

[0055] Furthermore, since the opening edge of top seal 35 that is broken by the insertion of opening end 39 of drug flow path section 38 can be made to hang down in close contact with the circumferential surface of opening end 39, as described above, this hanging portion of top seal 35 acts as a kind of valve, effectively preventing the fluid drug in storage section 33 from passing through the gap between opening end 39 of drug flow path section 38 and the opening edge of top seal 35 and flowing into recess 41 formed at the other end of insertion section 32.

[0056] As described above, the insertion section 32 is provided with a plurality of drug discharge holes 43 communicating with the drug flow path section 38 and the outside. That is, the side surface of the insertion section 32 is configured to have a plurality of drug discharge holes 43 communicating with the drug flow path section 38. By providing such drug discharge holes 43, the fluid drug is guided to the outside of the insertion section 32 through the mouth section 34 of the storage container 31, the drug flow path section 38, and the drug discharge holes 43 by gripping the storage section 33 and compressing it. It is preferable that the range in which the drug discharge holes 43 are arranged is set to a region from the tip to the center of the insertion section 32 as viewed in the longitudinal direction of the insertion section 32. More specifically, for example, when the drug injection device 200 is configured for washing the inside of the vagina, it is preferable to form a plurality of drug discharge holes 43 in a region from the tip of the insertion section 32 along the longitudinal direction of the insertion section 32, the dimension of which is within a range of about 30 mm to 60 mm.

[0057] Each drug discharge hole 43 is arranged at a predetermined interval along the longitudinal direction of the insertion part 32. In this way, by providing a plurality of drug discharge holes 43 on the side part of the insertion part 32, it becomes possible to quickly apply the drug to a wide area inside the body cavity such as the vagina or anus. In addition, when the injection of the fluid drug into the body is completed and the insertion part 32 is pulled out from the body, the surface of the pulled out insertion part 32 can spread the fluid drug inside the body, and the drug can be quickly applied to a wider area inside the body cavity such as the vagina or anus. In addition, the surface of the pulled out insertion part 32 becomes moist with the fluid drug attached thereto, so that the pain given to the user when the insertion part 32 is pulled out from the body can be alleviated.

[0058] In this embodiment, the multiple medicine ejection holes 43 are configured to include a first ejection hole group 44 consisting of multiple medicine ejection holes 43 arranged at predetermined intervals on a first imaginary line along the longitudinal direction of the insertion portion 32 as imagined on the surface of the insertion portion 32, and a second ejection hole group 45 consisting of multiple medicine ejection holes 43 arranged at predetermined intervals on a second imaginary line different from the first imaginary line and along the longitudinal direction of the insertion portion 32 as imagined on the surface of the insertion portion 32. By configuring the positional relationship of the medicine ejection holes 43 in this way, it becomes possible to effectively and quickly apply the medicine to a wide area inside a body cavity such as the vagina or anus.

[0059] Moreover, it is preferable that each of the medicine ejection holes 43 in the first ejection hole group 44 and each of the medicine ejection holes 43 in the second ejection hole group 45 are formed on both sides of the medicine flow path section 38. By adopting such a configuration, it becomes possible to apply the medicine to a wider area inside the body cavity such as the vagina or anus.

[0060] 10, it is preferable that each of the medicine ejection holes 43 in the first ejection hole group 44 and each of the medicine ejection holes 43 in the second ejection hole group 45 are arranged in a staggered positional relationship along the longitudinal direction of the insertion section 32. This configuration also contributes to applying the medicine to a wider area inside a body cavity such as the vagina or anus.

[0061] In this embodiment, the insertion section 32 is formed so that the cross section perpendicular to the longitudinal direction thereof is elliptical, but in this case, it is preferable that at least each medicine ejection hole 43 in the first ejection hole group 44 is formed on the side surface in the short axis direction of the insertion section 32 having an elliptical cross section. In this way, when the medicine ejection hole 43 is formed on the side surface in the short axis direction of the insertion section 32, the length of the medicine ejection hole 43 can be made short, and the fluid medicine passing through the inside can be effectively prevented from being clogged. Furthermore, it is possible to reduce the amount of fluid medicine remaining inside the medicine ejection hole 43 and not ejected to the outside.

[0062] In this embodiment, the hole diameters of the medicine ejection holes 43 are configured to be the same, but for example, the hole diameters of the medicine ejection holes 43 may be configured to gradually increase in the flow direction of the fluid medicine flowing through the medicine flow path portion 38. When such a configuration is adopted, in this embodiment, the fluid medicine is ejected from each medicine ejection hole 43 while flowing down the medicine flow path portion 38 from the other end side 32b to the tip side 32a of the insertion portion 32, so that the hole diameters are configured to gradually increase in the order of medicine ejection hole 43a, medicine ejection hole 43b, medicine ejection hole 43c, and medicine ejection hole 43d. If all of the drug ejection holes 43 were made to have the same hole diameter, there was a risk that pressure loss would cause the fluid drug to be difficult to eject from the drug ejection hole 43d located downstream of the drug flow path section 38. However, as described above, by making the hole diameter of each drug ejection hole 43 gradually larger in the downstream direction of the fluid drug flowing through the drug flow path section 38, it is possible to maintain a uniform amount of fluid drug ejected from each drug ejection hole 43, and it is possible to evenly apply the fluid drug over a wide area inside a body cavity such as the vagina or anus.

[0063] In addition, in this embodiment, the drug ejection hole 43 is not provided at the tip of the insertion portion 32, but this is not limited to such a configuration, and the drug ejection hole 43 may be provided at the tip of the insertion portion 32.

[0064] In addition, the other end of the insertion part 32 is provided with the bulging part 37 as described above, and the bulging part 37 is formed in the entire periphery of the other end of the insertion part 32. The shape of the bulging part 37 is not particularly limited, but in this embodiment, it is preferable that the bulging part 37 is formed so that the cross-sectional shape in the direction perpendicular to the longitudinal direction of the insertion part 32 is elliptical, as shown in FIG. 13, which is a plan view seen from the direction of the arrow C in FIG. 10. By providing such a bulging part 37, when the user inserts the insertion part 32 into a body cavity (inside the body) such as the vagina or anus, the bulging part 37 functions as a stopper, and the storage container 31 can be effectively prevented from being inserted into the body. In addition, by providing the bulging part 37, it becomes easier to rotate the storage container 31 or the insertion part 32 when screwing the storage container 31 to the other end side 32b of the insertion part 32, and the operability of the user can be improved.

[0065] Furthermore, by forming the bulge 37 so that its cross-sectional shape in a direction perpendicular to the longitudinal direction of the insertion portion 32 is elliptical, it is possible to minimize the psychological stress imposed on the user while effectively fulfilling its function as a stopper. That is, in the case of an elliptical shape, since there is a minor axis, it is easier for the user to recognize that the bulge 37 is smaller than the bulge 37 whose cross-sectional shape in a direction perpendicular to the longitudinal direction of the insertion portion 32 is circular, and this can induce a sense of security when the user inserts the insertion portion 32.

[0066] Moreover, it is preferable that the bulging portion 37 and the insertion portion 32 are configured to be connected by a smooth curved surface. By adopting such a configuration, it is possible to alleviate the pain felt when the user inserts the insertion portion 32 into a body cavity (inside the body) such as the vagina or anus and the bulging portion 37 abuts against the entrance of the body cavity, and it is also possible to give the user a psychological sense of security that there is no pain or that the pain is alleviated.

[0067] Moreover, it is preferable that the maximum diameter of the bulging portion 37 is configured to be larger than the maximum width of the storage container 31 connected to the other end of the insertion portion 32. By adopting such a configuration, it is possible to more effectively prevent the storage container 31 from being erroneously inserted into the body.

[0068] In this embodiment, as shown in Fig. 14(a) and (b), a flexible elastomer covering 46 may be provided at the tip of the insertion section 32. Fig. 14(a) is a side view of the insertion section 32, and Fig. 14(b) is a cross-sectional view thereof. The covering 46 is a member that covers the tip of the insertion section 32, and has a bowl-like shape with a storage space inside for storing the tip of the insertion section 32. By providing the elastomer covering 46, which is a flexible and soft material, at the tip of the insertion section 32, it is possible to give the user a psychological sense of security that the insertion section 32 is inserted into a body cavity (body) such as the vagina or anus without pain or that the pain is alleviated.

[0069] The method of attaching the covering 46 to the tip of the insertion section 32 is not particularly limited, but for example, as shown in Fig. 14(b), a step 47 is formed on a part of the surface of the tip of the insertion section 32, and the covering 46 is attached by abutting the inner peripheral surface of the storage space of the covering 46 against the step 47. The tip of the insertion section 32 and the covering 46 may be configured to be fixed to each other with an adhesive, or a fitting structure may be provided in which the step 47 and the opening edge around the storage space of the covering 46 fit together, and they may be fixed to each other. Alternatively, the covering 46 may be fitted to the tip of the insertion section 32 using an injection molding method.

[0070] Moreover, the covering 46 is preferably configured to be flush with the surface of the insertion portion 32 so that the user does not feel pain when inserting the insertion portion 32 into the body.

[0071] Also, as shown in Fig. 15(a), (b), and (c), the covering body 46 may be configured to include a side covering part 48 that extends from the tip end side 32a of the insertion part 32 toward the base end side (the other end side 32b) and covers a part of the side surface near the tip end of the insertion part 32. By providing such a side covering part 48, it is possible to give the user the impression that a wide area on the tip end side of the insertion part 32 is covered with the covering body 46 made of an elastomer, which is a flexible and soft material, and it is possible to effectively relieve the psychological stress felt by the user that "pain may occur" when inserting the insertion part 32 into a body cavity (body) such as the vagina or anus. In addition, when such a side covering part 48 is provided, it is configured so as not to overlap the medicine ejection hole 43 formed on the side surface of the insertion part 32. Here, Fig. 15(a) is a side view of the insertion part 32, and Fig. 15(b) is a side view seen from the direction of the arrow D in Fig. 15(a). FIG. 15(c) is an explanatory diagram showing a state in which the cover 46 has been removed from the insertion portion 32. As shown in FIG.

[0072] Moreover, it is preferable that the side covering parts 48 extending from the tip end side 32a of the insertion part 32 toward the base end side (the other end side 32b) are provided on both sides of the axis of the insertion part 32 as shown in each drawing of Figure 15. With such a configuration, it is possible to more effectively relieve the above-mentioned psychological stress felt by the user.

[0073] In particular, when the covering body 46 is attached to the insertion section 32 having an elliptical cross section perpendicular to the longitudinal direction as in this embodiment, the side covering part 48 is preferably formed so as to cover the side part in the longitudinal direction of the insertion section 32 having the elliptical cross section. By adopting such a configuration, the user can be given a strong impression that the tip side part on the wider side is covered over a wide area with an elastomer material, which is a flexible and pliable material, and therefore it is possible to more effectively alleviate the psychological stress felt by the user that "pain may occur" when inserting the insertion section 32 into a body cavity (inside the body) such as the vagina or anus.

[0074] Next, a third embodiment of a pharmaceutical injection device according to the present invention will be described with reference to the accompanying drawings. Fig. 16 is a schematic perspective view of a pharmaceutical injection device 300 according to a third embodiment of the present invention, and Fig. 17 is a schematic cross-sectional view showing a cross section along the longitudinal axis of the pharmaceutical injection device 300 according to the third embodiment of the present invention. Fig. 18 is a bottom view as seen from the direction of arrow E in Fig. 17. Note that each figure has been partially enlarged or reduced in order to make the configuration easier to understand.

[0075] The drug injection device 300 according to the third embodiment of the present invention, like the drug injection devices 300 according to the first and second embodiments described above, is a device for injecting a fluid drug into a body cavity (inside the body), such as the vagina or anus. A wide variety of drugs can be used as the fluid drug, including, for example, cleansers, contraceptives, anesthetics, enemas, antipyretics, lubricants, etc. The fluid drug can take various forms, such as lotion, gel, jelly, etc.

[0076] As shown in Figures 16 and 17, this drug injection device 300 comprises a storage container 51, an insertion section 52, and a storage container storage section 53, and is configured as an injection device of a type in which the peripheral surface of storage container 51 disposed in storage container storage section 53 is compressed via a pair of pressure plates 54 and a holder section 55, and the fluid drug inside is squeezed out and discharged from insertion section 52, as shown in the schematic perspective view of Figure 19. Here, insertion section 52, storage container storage section 53, and holder section 55 are preferably formed from a plastic resin material.

[0077] The storage container 51 is a flexible container and has a storage section in which the fluid medicine is stored. In addition, the storage container 51 has a mouth section 56 at the tip from which the fluid medicine flows out. The storage container 51 is configured to be connectable to the other end of the insertion section 52 via the mouth section 56. A top seal is attached to the mouth section 56, and the fluid medicine inside is configured not to flow out to the outside through the mouth section 56 when not connected to the insertion section 52. In addition, the material constituting the storage container 51 is not particularly limited as long as the storage container 51 itself has flexibility and the peripheral surface section is compressed and deformed to allow the fluid medicine inside to flow out to the outside through the mouth section 56. As the storage container 51, for example, a blow molded tube or an extrusion molded tube using a plastic resin raw material can be suitably used.

[0078] The insertion section 52 is inserted from its tip side 52a into a body cavity (inside the body) such as the vagina or anus of the human body, and is formed in an elongated shape extending along the direction of insertion into the body, as shown in the cross-sectional view of FIG. 20(a) and the side view of FIG. 20(b). The length of the insertion section 52 is preferably set in the range of 50 mm to 100 mm, for example, when the pharmaceutical injection device 300 is configured for washing the inside of the vagina. A reservoir container housing section 53 is integrally formed at the other end of the insertion section 52. The tip of the insertion section 52 is formed in a dome shape with a smooth curved surface so that the user does not feel pain when the insertion section 52 is inserted into the body. The insertion section 52 is formed so that its cross section is circular. FIG. 20(b) is a side view seen from the direction of the arrow F in FIG. 20(a).

[0079] As shown in FIG. 17 and FIG. 20, the insertion section 52 includes a drug flow path section 57 to which the drug pushed out from the storage container 51 (storage section) is guided, and a drug discharge hole 58 that communicates between the drug flow path section 57 and the outside. The drug flow path section 57 is formed inside the insertion section 52. The drug flow path section 57 is formed so as to extend along the longitudinal direction of the insertion section 52, and includes an opening end 59 that opens at the other end of the insertion section 52. The end of the drug flow path section 57 opposite to the opening end 59 (the end on the tip side 52a of the insertion section 52) extends to the vicinity of the tip inside the insertion section 52, but is configured not to open at the tip of the insertion section 52. The opening end 59 of the drug flow path section 57 includes at least one or more sharp protrusions 60, and is configured so as to be able to be inserted into a top seal provided at the mouth section 56 of the storage container 51.

[0080] As described above, the insertion section 52 is provided with a plurality of drug discharge holes 58 communicating with the drug flow path section 57 and the outside. That is, the side surface of the insertion section 52 is configured to have a plurality of drug discharge holes 58 communicating with the drug flow path section 57. By providing such drug discharge holes 58, the fluid drug is guided to the outside of the insertion section 52 through the mouth section 56 of the storage container 51, the drug flow path section 57, and the drug discharge holes 58 by compressing the storage container 51. It is preferable that the range in which the drug discharge holes 58 are arranged is set to a region from the tip of the insertion section 52 to a position near the center, as viewed in the longitudinal direction of the insertion section 52. More specifically, for example, when the drug injection device 300 is configured for washing the inside of the vagina, it is preferable to form a plurality of drug discharge holes 58 in a region from the tip of the insertion section 52 along the longitudinal direction of the insertion section 52, the dimension of which is within a range of about 30 mm to 60 mm.

[0081] Here, in this embodiment, drug flow path section 57 is formed so that the axis of drug flow path section 57 does not overlap the axis of insertion section 52, and the distance between drug flow path section 57 formed inside insertion section 52 and the outer surface of insertion section 52 is as close as possible. By forming drug flow path section 57 at such a position, the length of drug discharge hole 58 can be shortened, and clogging of the fluid drug passing through the inside of drug discharge hole 58 can be effectively prevented. Furthermore, it is possible to reduce the amount of fluid drug remaining inside drug discharge hole 58 and not discharged to the outside.

[0082] Each drug discharge hole 58 is arranged at a predetermined interval along the longitudinal direction of the insertion part 52. In this way, by providing a plurality of drug discharge holes 58 on the side part of the insertion part 52, it becomes possible to quickly apply the drug to a wide area inside the body cavity such as the vagina or anus. In addition, when the injection of the fluid drug into the body is completed and the insertion part 52 is pulled out from the body, the surface of the pulled out insertion part 52 can spread the fluid drug inside the body, and the drug can be quickly applied to a wider area inside the body cavity such as the vagina or anus. In addition, the surface of the pulled out insertion part 52 becomes moist with the fluid drug attached thereto, so that the pain given to the user when the insertion part 52 is pulled out from the body can be alleviated.

[0083] In this embodiment, the hole diameter of each medicine ejection hole 58 is configured to increase stepwise in the flow direction of the fluid medicine flowing through medicine flow path portion 57. In this embodiment, the fluid medicine is ejected from each medicine ejection hole 58 while flowing down medicine flow path portion 57 from the other end side toward the tip end side of insertion portion 52, so that the hole diameters are configured to gradually increase in the order of medicine ejection hole 58a, medicine ejection hole 58b, medicine ejection hole 58c, and medicine ejection hole 58d. If all the medicine ejection holes 58 are configured to have the same hole diameter, the fluid medicine may not be easily ejected from the medicine ejection holes 58d located downstream of the medicine flow path section 57 due to the influence of pressure loss, but as described above, by configuring the hole diameter of each medicine ejection hole 58 to gradually increase in size along the flow direction of the fluid medicine flowing through the medicine flow path section 57, it is possible to maintain a uniform amount of the fluid medicine ejected from each medicine ejection hole 58, and it is possible to apply the fluid medicine evenly over a wide area inside the body cavity such as the vagina or anus. Note that it is not necessary to gradually increase the hole diameter of each medicine ejection hole 58 along the flow direction of the fluid medicine flowing through the medicine flow path section 57, and the hole diameter of each medicine ejection hole 58 may be configured to be the same size.

[0084] In addition, in this embodiment, when the hole diameter is increased stepwise, the diameter in the direction along the longitudinal direction of the insertion portion 52 is gradually increased, and the diameter in the direction perpendicular to the longitudinal direction of the insertion portion 52 is configured to be the same for all the medicine ejection holes 58. That is, the medicine ejection hole 58a is configured as a circular hole, and the medicine ejection holes 58b, 58c, and 58d are configured as long holes whose major axis direction is the longitudinal direction of the insertion portion 52. By adopting such a hole configuration, it is possible to obtain the effect of maintaining the amount of the fluid medicine ejected from each of the medicine ejection holes 58 as described above uniformly, while ejecting the fluid medicine from each of the medicine ejection holes 58 widely in the direction along the depth direction of the body cavity inside the body cavity such as the vagina or anus, and it is possible to apply the medicine to the inside of the body cavity over an even wider range.

[0085] In addition, in this embodiment, the drug ejection hole 58 is not provided at the tip of the insertion portion 52, but this is not limited to such a configuration, and the drug ejection hole 58 may be provided at the tip of the insertion portion 52.

[0086] In addition, the open end 59 of the drug flow path section 57 is configured to have a sharp protrusion 60. The shape of this protrusion 60 is not particularly limited as long as it can break through the top seal provided at the mouth 56 of the storage container 51. As described in the second embodiment, the cylindrical protrusion 60 exposed inside the storage container housing section 53 may be formed obliquely into a bamboo spear shape. In addition, the protrusion 60 may be configured as a jagged protrusion provided at the open end 59.

[0087] As described above, by providing the opening end 59 of the drug flow path section 57 with the sharp projection 60, simply by pushing the mouth section 56 of the storage container 51 into the other end side 52b of the insertion section 52 and setting it, the opening end 59 of the drug flow path section 57 is inserted into the top seal (opening end 59 breaks through the top seal), making it possible to communicate between the storage container 51 (storage section) and the drug flow path section 57. Furthermore, with this configuration, the user does not need to peel off the top seal provided at the mouth section 56 of the storage container 51 with his or her fingers, and further, it is possible to maintain a sealed state of the storage container 51 in which the fluid drug is stored until the user actually uses the drug injection device 300, so that the drug injection device 300 can be used in a hygienic and preferable state.

[0088] The storage container housing 53 is a member provided on the other end side 52b of the insertion portion 52, and is configured to include a peripheral wall portion 61 that surrounds the periphery of the storage container 51 connected to the other end side of the insertion portion 52, as shown in Fig. 17 and Fig. 20. One end of this storage container housing 53 has a smooth curved structure and is joined to the other end side surface of the insertion portion 52. In addition, the other end side 53b of the storage container housing 53 is opened, and is configured so that the storage container 51 and a holder portion 55 described later can be inserted into the inner space of the storage container housing 53 through this opening.

[0089] As shown in the perspective view of FIG. 16 and the bottom view of FIG. 18, the peripheral wall 61 of the storage container housing 53 is substantially rectangular in cross section perpendicular to the longitudinal direction of the insertion portion 52, and is configured to have four wall portions 62. A portion of each wall portion 62, which is a pair of two wall portions 62 facing each other among the four wall portions 62, constitutes a pressing plate 54 that can be displaced in a direction approaching or moving away from the storage container 51. The pair of pressing plates 54 serve as pressing means for pressing and deforming the storage container 51. Each pressing plate 54 is formed by forming two slits 63 along the longitudinal direction of the insertion portion 52 in the wall portion 62 at a predetermined interval. Each slit 63 is formed so as to be connected to the other end of the wall portion 62 (the opening end of the storage container housing 53), and the portion of the wall portion 62 sandwiched between the two slits 63 constitutes the pressing plate 54. With this configuration, each pressure plate 54 is formed to extend along the longitudinal direction of the storage container 51, and can be displaced in a direction toward or away from the storage container 51, with the base end portion located on the other end side 52b of the insertion portion 52 as a fulcrum.

[0090] In this embodiment, the storage container 51 is further provided with a holder portion 55 that supports the storage container 51 inside the storage container housing portion 53. The holder portion 55 is preferably formed from a plastic resin material. The holder portion 55 is disposed between the pair of pressure plates 54 and the storage container 51, and has a pair of clamping pieces 64 that clamp the side portion of the storage container 51. The holder portion 55 is also disposed on the bottom side of the storage container 51, and has a joint portion 65 to which one end of each clamping piece 64 is connected.

[0091] Each clamping piece 64 has a predetermined thickness, and has a first surface 66 that contacts the side surface of the storage container 51 and a second surface 67 that contacts the pressing plate 54 when installed in the storage container storage section 53. With respect to each clamping piece 64, the first surface 66 that contacts the side surface of the storage container 51 is formed to a size that contacts a wide range of the side surface of the storage container 51. Also, as shown in the cross-sectional view of FIG. 21, the opposing surfaces (the opposing first surfaces 66) of the pair of clamping pieces 64 that face each other are formed in a substantially V-shape in which the distance between them increases as they move away from the joint 65 in cross-sectional view, and the holder section 55 is configured so that the pair of clamping pieces 64 can be displaced in a direction in which they approach or move away from each other with the joint 65 as a fulcrum due to their elastic deformation.

[0092] As described above, the holder section 55 is a member that supports the storage container 51 inside the storage container storage section 53, but is provided with a position change means 68 that changes between an unconnected position where the opening end 59 of the drug flow path section 57 is not connected to the mouth section 56 of the storage container 51 and a connected position where the opening end 59 of the drug flow path section 57 is inserted into the mouth section 56 and connected. The position change means 68 is configured to include a clamping piece protrusion 69 that protrudes from each clamping piece 64 toward each pressing plate 54, and a plurality of positioning holes 70 that are formed in each pressing plate 54 and match the clamping piece protrusion 69. The clamping piece protrusion 69 is formed on the first surface 66 of each clamping piece 64. Each positioning hole 70 is formed at a position corresponding to the unconnected position and the connected position. The positioning hole 70a corresponding to the unconnected position and the positioning hole 70b corresponding to the connected position are arranged at a predetermined interval along the longitudinal direction of the insertion section 52. By providing such a position varying means 68, for example, with the storage container 51 interposed between the pair of clamping pieces 64 of the holder part 55, the storage container 51 can be supported in the storage container storage part 53 in a state in which the mouth part 56 of the storage container 51 is not connected to the open end part 59 of the drug flow path part 57 by inserting the storage container 51 into the storage container storage part 53 from the opening at the other end of the storage container storage part 53 until the clamping piece protrusion 69 engages with the positioning hole 70b corresponding to the above-mentioned unconnected position. On the other hand, at the timing of using the drug injection device 300, as shown in FIG. 22, by further pushing the holder part 55 in the storage container storage part 53, the clamping piece protrusion 69 engages with the positioning hole 70b corresponding to the above-mentioned connection position, so that the storage container 51 can be supported in the storage container storage part 53 in a state in which the mouth part 56 of the storage container 51 is connected to and communicates with the open end part 59 of the drug flow path part 57.

[0093] Furthermore, the drug injection device 300 according to this embodiment is configured to include a pressure plate separation regulation means 71 that regulates the separation between the pair of pressure plates 54 when the pair of pressure plates 54 are displaced in a direction approaching the storage container 51 and the storage container 51 is compressed via the pair of clamping pieces 64, thereby discharging the fluid drug stored in the storage container 51 from the vicinity of the drug discharge hole 58 to the outside. By including such a pressure plate separation regulation means 71, it is possible to effectively prevent a user from reusing a used drug injection device 300 after using the drug injection device 300 to complete the discharge of the fluid drug stored in the storage container 51. Furthermore, since the pair of pressure plates 54 are regulated from moving in a direction away from the storage container 51, it is possible to reliably prevent the storage container 51 from expanding due to its own elastic restoring force, and as a result, it is possible to effectively prevent the fluid drug injected into the body from flowing back into the insertion section 52 via the drug discharge hole 58.

[0094] Here, various configurations can be adopted for the configuration of the pressure plate separation regulation means 71 that regulates the separation between the pair of pressure plates 54. For example, the pressure plate separation regulation means 71 can be configured to include a pressure plate engagement portion 72 provided on each pressure plate 54 shown in Fig. 20 and a joint engagement portion 73 provided on the joint 65 shown in Figs. 18 and 21, and the separation between the pair of pressure plates 54 can be regulated by engagement between the pressure plate engagement portion 72 and the joint engagement portion 73. In Fig. 20, the pressure plate engagement portion 72 is configured as a through hole formed in the pressure plate 54. Also, the joint engagement portion 73 is configured as a pair of engagement claws that are inserted into the through hole and engaged with it, as shown in Fig. 18.

[0095] Each of the engagement claws (joint engagement parts 73) is integrally provided at its tip with an outward claw part 74 that engages with the edge of the through hole. Each of the engagement claws is formed so as to extend in a direction perpendicular to the longitudinal direction of the insertion part 52 and in a direction facing the pressing plate 54. In addition, an inclined guide surface 75 is provided at the tip of each of the engagement claws (joint engagement parts 73), and when the engagement claws are inserted into the through hole (pressing plate engagement part 72) of the pressing plate 54, the inclined guide surface 75 abuts against the edge of the through hole, and the pair of engagement claws bend in a direction approaching each other, so that the claw parts 74 at the tip can easily pass through the through hole. After the claw parts 74 at the tip pass through the through hole, the elastic restoring force of the engagement claws causes the engagement claws to separate from each other, and the claw parts 74 at the tip engage with the edge of the through hole, so that the pressing plate 54 cannot return to its original position, as shown in FIG. 23.

[0096] The provision of such pressure plate separation restriction means 71 not only prevents the drug injection device 300 from being reused and prevents backflow of the fluid drug, but also clearly notifies the user that injection of the fluid drug has been completed. Specifically, a sound is generated when the engagement claws (joint engagement portion 73) and the through-holes (pressure plate engagement portion 72) are engaged, and this sound can be used to inform the user that the pair of presser plates 54 do not need to be pushed any further. Furthermore, since the vibration generated when the engagement claws (joint engagement portion 73) and the through-holes (pressure plate engagement portion 72) are engaged is transmitted directly to the fingers, even if the user does not hear the sound, the final position of the pair of presser plates 54 (final position regarding the amount of approach between the presser plates 54) can be notified through the vibration of the fingers, and as a result, it is possible to clearly inform the user that injection of the fluid drug has been completed.

[0097] The drug injection device 300 according to the present invention has been described above using the first to third embodiments as examples, but the aspects of each embodiment are not limited to the above. For example, even if a component is provided only in each embodiment, the component applicable to other embodiments can be configured to be provided as appropriate. More specifically, for example, the elastomer covering body covering the tip of the insertion section 52 has been described only in the second embodiment, but is not limited to the drug injection device 300 according to the second embodiment, and may also be provided in the drug injection device 300 according to the first and third embodiments. Furthermore, in the third embodiment, the drug ejection holes are arranged in a line along the longitudinal direction of the insertion section 52, but as disclosed in the first and second embodiments, the drug ejection holes 58 may be configured to be arranged on a first virtual line and a second virtual line. [Explanation of symbols]

[0098] 100 Drug injection device according to the first embodiment 1 Insertion section 2 Pistons 3. Storage Container 4 Outer member 5. Storage section 6. Torso 7 Finger rest 8 Outflow hole 9 Openings 10 Recess 11 Rear end of piston 12 Void portion (drug flow path portion) 13 Drug ejection hole 14 1st discharge hole group 15 2nd discharge hole group 16 Drug leakage prevention section 17 Protruding end 18 Male thread portion formed on the outer circumferential surface of the storage container 19 Female thread portion formed on the inner peripheral surface of the outer member 20 Regulatory measures 21 Engagement protrusion 22 Piston fitting part 23 Claw part 24 Slope 25 Rear end surface of rear end of piston 26 Edge of recess opening 200 Drug injection device according to the second embodiment 31 Storage Container 32 Insertion section 33 Storage section 34 Mouth 35 Heaven Seal 36 Male thread portion formed on the outer peripheral surface of the mouth portion 37 Bulge 38 Drug flow path section 39 Open end of drug flow path 40 Protrusion 41 Recess 42 Female thread portion formed on the inner peripheral surface of the recess 43 Drug ejection hole 44 1st discharge hole group 45 2nd discharge hole group 46 Covering 47 Step 48 Side Coverage 300 Drug injection device according to the third embodiment 51 Storage Container 52 Insertion section 53 Storage container insertion part 54 Pressure plate 55 Holder part 56 Mouth 57 Drug flow path section 58 Drug ejection hole 59 Open end 60 Protrusion 61 Peripheral wall section 62 Wall 63 Slit 64 Clamping piece 65 Joint 66 First Side 67 Second Side 68 Position variable means 69 Clamping piece protrusion 70 Positioning hole 71 Pressing plate separation control means 72 Pressing plate engagement part 73 Joint engagement part 74 Claw part 75 Tilt the case back

Claims

1. A drug injection device for injecting a fluid drug into the vagina or anus, A long insertion part to be inserted into the vagina or anus; a storage section in which the fluid medicine is stored; a drug flow path portion formed inside the insertion portion and through which the fluid drug pushed out from the storage portion is guided; The drug flow path portion is formed along the longitudinal direction of the insertion portion, the elongated insertion portion includes a plurality of medicine ejection holes communicating the medicine flow path portion with the outside, the hole diameter of each of the medicine ejection holes is increased stepwise along a downward flow direction of the fluid medicine flowing through the medicine flow path section, the plurality of medicine ejection holes include a first ejection hole group including a plurality of medicine ejection holes arranged at predetermined intervals on a first imaginary line along an assumed longitudinal direction of the insertion portion on a surface of the insertion portion; a second ejection hole group including a plurality of medicine ejection holes arranged at predetermined intervals on a second imaginary line that is different from the first imaginary line and that is along an assumed longitudinal direction of the insertion portion on a surface of the insertion portion, each medicine ejection hole in the first ejection hole group and each medicine ejection hole in the second ejection hole group are formed at opposite sides of the medicine flow path portion, the medicine ejection holes in the first ejection hole group and the medicine ejection holes in the second ejection hole group are alternately arranged along a longitudinal direction of the insertion portion, The insertion portion has a cross-sectional shape perpendicular to the longitudinal direction that is elliptical over the entire longitudinal direction, A medicine injection device, characterized in that at least some of the plurality of medicine ejection holes are formed in a side surface portion in a minor axis direction of the insertion portion having an elliptical cross section.

2. 2. The drug injection device according to claim 1, wherein the drug ejection holes are arranged at predetermined intervals along the longitudinal direction of the insertion portion.

Images