Injection device

Abstract

The objective is to provide an injection device that easily maintains the position of the barrel tip even when the rod is pushed in. [Solution] The present invention provides a syringe comprising a barrel having an axial tip and a base, from which contents can be discharged from the tip, and a rod inserted into the barrel from the base and pushed toward the tip, and an operating mechanism for pushing the rod, wherein the rod includes a portion to be pressed, and the operating mechanism comprises an operating part having a pushing part that pushes the portion to be pressed toward the axial tip, the operating part is configured to be operable in an intersecting direction that intersects the axial direction, and when the operating part is operated in the intersecting direction, the pushing part pushes the portion to be pressed toward the tip, and the rod is pushed toward the tip.

Description

Technical Field

[0001] The present invention relates to an injection device capable of administering a content filled therein into a nostril or oral cavity.

Background Art

[0002] Conventionally, syringes for discharging liquid or the like are known (see Patent Document 1). As shown in Figure 51, this syringe 901 includes an outer barrel 910 and a plunger 920 inserted into the outer barrel 910. The outer barrel 910 includes a hollow cylindrical main body 912. One end of the main body 912 is provided with a mouth portion 913 having a smaller diameter than the main body 912, and the other end is provided with a flange 914 for finger hooking. A needle hub or the like is attached to the mouth portion 913. This syringe 901 discharges liquid when the plunger 920 is pushed from the other end side toward the one end side with respect to the outer barrel 910.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of Invention

Problems to be Solved by the Invention

[0004] However, in the above syringe 901, since the rod is pushed in along the direction of needle insertion or the direction of liquid discharge, during liquid discharge, the position of the distal end portion of the outer barrel 910, specifically, the position of the mouth portion 913 to which the needle hub is attached and which serves as the liquid discharge port, may shift in the pushing operation direction, that is, the direction of needle insertion or the discharge direction. Especially in the case of self-administration, these problems may cause injury.

[0005] Accordingly, the present invention has an object to provide an injection device that can easily maintain the position of the distal end portion of the barrel even when a rod is pushed in for operation.

Means for Solving the Problems

[0006] The injection device of the present invention is A syringe having an axial tip and a base, a barrel from which contents can be discharged from the tip, and a rod that is inserted into the barrel from the base and can be pushed towards the tip, It comprises an operating mechanism for pushing in the aforementioned rod, The rod includes the portion to be pressed, The operating mechanism includes an operating section having a pressing section that pushes the pressed section toward the tip in the axial direction, The operating unit is configured to be operable in a direction that intersects the axial direction, When the operating part is operated in the aforementioned intersecting direction, the pushing part pushes the pressed part toward the tip, and the rod is pushed toward the tip.

[0007] With this configuration, the rod can be pushed towards the tip along the axial direction relative to the barrel by operating the operating part in a direction that intersects it. Therefore, the position of the tip of the barrel is less likely to shift and is easier to maintain during the rod pushing operation.

[0008] In the aforementioned injection device, The operating section may be arranged in parallel with the rod before it is pushed in, in a radial direction perpendicular to the axial direction.

[0009] In this way, the operating part and the rod before it is pushed in are arranged in parallel in the radial direction perpendicular to the axial direction, making it easier to operate the operating part.

[0010] Furthermore, the injection device is The barrel position regulating unit is provided to regulate the position of the barrel, The barrel position restricting unit comprises an axial restricting unit that restricts the movement of the barrel at least toward the tip in the axial direction, and a radial restricting unit that restricts the radial position of the barrel. The radial restricting portion is positioned towards the tip side relative to the axial restricting portion. The pressing portion may be positioned on the base end side with respect to the axial restricting portion.

[0011] Thus, a radial restricting portion that restricts the radial position of the barrel is positioned at the tip of the axial restricting portion that restricts the movement of the barrel at least toward the tip in the axial direction, and a pushing portion is positioned at the base end of the axial restricting portion in the axial direction. This makes it easier to maintain the position of the syringe relative to the operating mechanism when operating the operating portion to push in the rod.

[0012] Furthermore, in the aforementioned injection device, The operating unit is configured to be rotatable in the intersecting direction by a rotational operation, and may include a pivot shaft portion that serves as the center of rotation in the rotational operation, an operating body portion extending in the axial direction from the pivot shaft portion, and a push portion extending in the intersecting direction from the operating body portion.

[0013] With this configuration, when the operating part is operated, the pushing part, which rotates in a cross direction at a position away from the pivot shaft, can push the rod toward the axial end. Therefore, due to the lever principle, the rod can be smoothly pushed in even with a small force. Details are as follows.

[0014] In the operating section, the operating body extends axially from the pivot shaft, and the pushing part extends intersectingly from the operating body. Therefore, the pushing part is positioned axially away from the pivot shaft by the amount that the operating body extends. At this distance, it rotates in the intersecting direction by the rotation operation, pushing the part of the rod to be pushed toward the axial end. This allows the rod to be pushed using the principle of leverage, enabling the rod to be pushed smoothly with little force.

[0015] Furthermore, the injection device is Equipped with a biasing member, The rod comprises a rod body portion that is inserted into the barrel from the base end and can be pushed toward the tip end, and a rod pushing portion having the portion to be pushed. The rod pushing portion is configured to be changeable from a first state in which it engages with the rod body at a predetermined position in the axial direction, to a second state in which it engages with the rod body at a position closer to the base end in the axial direction than the predetermined position. The syringe is capable of dispensing its contents in two ways: an administration in which the rod body is pushed to a predetermined indentation position relative to the barrel when the rod pushing portion is in the first state, and an administration in which the rod body is pushed further into the barrel from the predetermined indentation position after the rod pushing portion has changed from the first state to the second state. When the operating part is operated in the intersecting direction from the starting position of the operation, the pressed part is pressed by the pressing part, causing the rod pressing part to move from the starting position of the movement, which is the starting point of the movement of the rod pressing part, toward the tip in the axial direction. The biasing member biases the rod pushing portion to return from the destination to the starting position after administration in the first state, and the operating portion to return from the position after operation to the starting position. When the rod pushing portion returns to the starting position due to the biasing force, it may change from the first state to the second state, thereby enabling administration in the second state using the syringe.

[0016] With this configuration, the contents of the syringe can be divided and administered by repeating the same operation on the operating part. Specifically, when the rod pushing part moves from the first state to the second state, the biasing force of the biasing member causes the rod pushing part to return to its starting position and the operating part to return to its starting position. Therefore, after the contents of the syringe are administered by operating the operating part when the rod pushing part is in the first state, the biasing force of the biasing member causes the rod pushing part to return to its starting position and the operating part to return to its starting position, and the rod pushing part moves to the second state. As a result, administration in the second state of the syringe becomes possible, and the contents of the syringe can be divided and administered by repeating the same operation. [Effects of the Invention]

[0017] As described above, according to the present invention, it is possible to provide an injection device that easily maintains the position of the distal end portion of the barrel even when the rod is pushed in for operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] [Figure 1A] Figure 1A is a perspective view of the injection device according to the first embodiment. [Figure 1B] Figure 1B is a perspective view of the injection device in a state where a part of the operation mechanism main body is removed. [Figure 2] Figure 2 is a view of the injection device as seen from the Y-axis direction. [Figure 3] Figure 3 is a view of the injection device as seen from the Z-axis direction. [Figure 4] Figure 4 is a cross-sectional view of the injection device at the IV-IV position in Figure 3. [Figure 5] Figure 5 is a cross-sectional view of the injection device at the V-V position in Figure 3. [Figure 6] Figure 6 is a cross-sectional view of the injection device at the VI-VI position in Figure 2. [Figure 7] Figure 7 is a view of the injection device in a state where a part of the operation mechanism main body is removed, as seen from the Y-axis direction. [Figure 8] Figure 8 is a view of the rod included in the injection device as seen from the Y-axis direction. [Figure 9] Figure 9 is a view of the rod main body portion included in the rod as seen from the Y-axis direction. [Figure 10] Figure 10 is a cross-sectional view of the rod main body at the X-X position in Figure 9. [Figure 11] Figure 11 is a perspective view of the rod main body portion. [Figure 12] Figure 12 is a perspective view of the rod pushing portion included in the rod. [Figure 13] Figure 13 is a perspective view of the rod pushing portion. [Figure 14] Figure 14 is a perspective view of the operation portion included in the injection device. [Figure 15]Figure 15 is a cross-sectional view of the operating section at position IV-IV in Figure 3. [Figure 16] Figure 16 is a perspective view of one of the divided members of the main body of the operating mechanism. [Figure 17] Figure 17 is a perspective view of the other divided member of the main body of the operating mechanism. [Figure 18A] Figure 18A is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the injection device when the rod pushing portion is in the first state during the first injection operation. [Figure 18B] Figure 18B is a partially enlarged cross-sectional view of the injection device at position VI-VI in Figure 2, and is a partially enlarged cross-sectional view of the injection device when the rod pushing portion is in the first state during the first injection operation. [Figure 19] Figure 19 is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the injection device in a state where the operating part has been rotated to an intermediate position between the starting position and the ending position of the operation during the first injection of the contents. [Figure 20] Figure 20 is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the injection device in a state where the operating part has been rotated to the end position during the first injection of the contents. [Figure 21] Figure 21 is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the device after the first injection of contents has been completed and the operating section has returned to an intermediate position between the end position and the start position. [Figure 22] Figure 22 is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the device after the operation unit has returned to the starting position after the first injection of contents has been completed. [Figure 23] Figure 23 is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the injection device when the rod pushing portion is in the second state during the second injection operation. [Figure 24]Figure 24 is a cross-sectional view of the injection device at position IV-IV in Figure 3, showing the injection device in a state where the operating part has rotated to the end position of the operation during the second injection operation. [Figure 25] Figure 25 is a perspective view of the injection device according to the second embodiment. [Figure 26] Figure 26 is a view of the injection device from the Y-axis direction. [Figure 27] Figure 27 is a view of the injection device from the Z-axis direction. [Figure 28] Figure 28 is a cross-sectional view of the injection device at position XXVIII-XXVIII in Figure 26. [Figure 29] Figure 29 is a cross-sectional view of the injection device at position XXIX-XXIX in Figure 26. [Figure 30] Figure 30 is a cross-sectional view of the injection device at position XXX-XXX in Figure 27. [Figure 31] Figure 31 is a perspective view of the syringe provided in the injection device. [Figure 32] Figure 32 is a perspective view of the barrel and barrel holder of the syringe. [Figure 33] Figure 33 is a view of the barrel holding portion from the Z-axis direction. [Figure 34] Figure 34 is a view of the barrel holding portion from the X-axis direction. [Figure 35] Figure 35 is a perspective view of the main body of the fishing rod. [Figure 36] Figure 36 is an enlarged perspective view of the base end of the rod body in the X-axis direction. [Figure 37] Figure 37 is an enlarged perspective view of the base end of the rod body in the X-axis direction. [Figure 38] Figure 38 is a perspective view of the rod pushing portion of the rod. [Figure 39] Figure 39 is a view of the rod pushing section from the Y-axis direction. [Figure 40] Figure 40 is a cross-sectional view of the rod pressing portion at the XL-XL position in Figure 39. [Figure 41] Figure 41 is a cross-sectional view of the rod pressing portion at its central position in the Y-axis direction. [Figure 42] Figure 42 is a perspective view of the operating section of the injection device. [Figure 43] Figure 43 is a cross-sectional view of the operating section at its central position in the Y-axis direction. [Figure 44] Figure 44 is a perspective view of the main body of the operating mechanism of the injection device. [Figure 45] Figure 45 is a view of the divided member of the operating mechanism body as seen from the Y-axis direction. [Figure 46A] Figure 46A is a cross-sectional view of the injection device at position XXVIII-XXVIII in Figure 26, and is a cross-sectional view of the injection device when the rod pushing portion is in the first state during the first injection operation. [Figure 46B] Figure 46B is a cross-sectional view of the injection device at position XXIX-XXIX in Figure 26, and is a cross-sectional view of the injection device when the rod pushing portion is in the first state during the first injection operation. [Figure 47A] Figure 47A is a cross-sectional view of the injection device at position XXVIII-XXVIII in Figure 26, and shows the injection device in a state where the operating part has rotated to the end position of the operation during the first injection of the contents. [Figure 47B] Figure 47B is a cross-sectional view of the injection device at position XXIX-XXIX in Figure 26, showing the injection device in a state where the operating part has rotated to the end position during the first injection of the contents. [Figure 47C] Figure 47C is a cross-sectional view of the injection device at position XXX-XXX in Figure 27, and shows the injection device in a state where the operating part has been rotated to the end position during the first injection of the contents. [Figure 48A]Figure 48A is a cross-sectional view of the injection device at position XXVIII-XXVIII in Figure 26, showing the device after the first injection of contents has been completed and the operating section has returned to an intermediate position between the end position and the start position. [Figure 48B] Figure 48B is a cross-sectional view of the injection device at position XXIX-XXIX in Figure 26, showing the device after the first injection of contents has been completed and the operating section has returned to an intermediate position between the end position and the start position. [Figure 49A] Figure 49A is a cross-sectional view of the injection device at position XXVIII-XXVIII in Figure 26, showing the device after the first injection of contents has finished, when the operating part has returned to the starting position and the rod pushing part is in the second state. [Figure 49B] Figure 49B is a cross-sectional view of the injection device at position XXIX-XXIX in Figure 26, showing the device after the first injection of contents has finished, when the operating part has returned to the starting position and the rod pushing part is in the second state. [Figure 49C] Figure 49C is a cross-sectional view of the injection device at position XXX-XXX in Figure 27, showing the device after the first injection of contents has finished, when the operating part has returned to the starting position and the rod pushing part is in the second state. [Figure 50A] Figure 50A is a cross-sectional view of the injection device at position XXVIII-XXVIII in Figure 26, and shows the injection device in a state where the operating part has rotated to the end position of the operation during the second injection operation. [Figure 50B] Figure 50B is a cross-sectional view of the injection device at position XXIX-XXIX in Figure 26, and shows the injection device in a state where the operating part has rotated to the end position of the operation during the second injection operation. [Figure 50C] Figure 50C is a cross-sectional view of the injection device at position XXX-XXX in Figure 27, and shows the injection device in the state where the operating part has rotated to the end position of the operation during the second injection operation. [Figure 51] Figure 51 is a perspective view of a conventional injection device. [Modes for carrying out the invention]

[0019] The first embodiment of the present invention will be described below with reference to Figures 1A to 24.

[0020] The injection device of this embodiment can administer the contents (in this example, drug solution) filled inside the syringe into the nasal cavity or oral cavity in multiple doses. The injection device of this embodiment administers the contents (drug solution) in two doses, but it may also administer them in three or more doses.

[0021] Specifically, as shown in Figures 1A to 7, the injection device 1 comprises a syringe 2 into which the contents are filled, and an operating mechanism 3 having an operating section 31 that performs the operation of administering (in this embodiment, spraying) the contents from the syringe 2 into the nasal cavity or the like. The injection device 1 also includes a biasing member S that directly or indirectly biases the operating section 31. Furthermore, the injection device 1 includes a barrel position regulating section 4 that regulates the position of the syringe 2 (more specifically, the barrel 21 described later).

[0022] Syringe 2 has a tip portion 21a and a base portion 21b in the direction in which the central axis C extends, and comprises a barrel 21 from which contents can be discharged from the tip portion 21a, and a rod 22 that is inserted into the barrel 21 from the base end and can be pushed toward the tip end. Syringe 2 also comprises a spray nozzle N located at the tip portion 21a of the barrel 21.

[0023] The barrel 21 is formed of a material that is, for example, transparent and can withstand the internal pressure applied when dispensing the drug solution. The material of the barrel 21 in this embodiment is a resin containing cyclic olefins such as norbornene as repeating units, or glass, etc.

[0024] Specifically, the barrel 21 comprises a cylindrical barrel body 211 into which contents can be filled, a discharge portion 212 positioned at the tip of the barrel body 211 and capable of discharging the contents filled in the barrel body 211 to the outside, and a flange portion 213 extending radially outward from the base end of the barrel body 211.

[0025] The barrel body 211 is cylindrical with an open base and a closed tip except for the discharge portion 212. In this embodiment, the barrel body 211 is cylindrical, and the outer diameter of the barrel body 211 is the same at each position in the direction in which the central axis C extends. The inner diameter of the barrel body 211 is also the same at each position in the direction in which the central axis C extends. In the following description, the direction in which the central axis C extends will be referred to as the X-axis direction of the Cartesian coordinate system, the first direction perpendicular to the central axis C (in this example, the width direction of the injection device 1) will be referred to as the Y-axis direction of the Cartesian coordinate system, and the second direction perpendicular to the direction in which the central axis C extends and the first direction will be referred to as the Z-axis direction of the Cartesian coordinate system. In the following description, the discharge portion 212 side of the barrel 21 will be referred to as the tip side in the X-axis direction, the flange portion 213 side of the barrel 21 will be referred to as the base end side in the X-axis direction, and the radial direction of the barrel 21 will be simply referred to as the radial direction.

[0026] The discharge section 212 is located at the tip end of the barrel body 211 in the X-axis direction. This discharge section 212 is cylindrical with an outer diameter smaller than the outer diameter of the barrel body 211 and communicates the inside and outside of the barrel body 211. In this embodiment, the discharge section 212 is cylindrical and is positioned so that its central axis coincides with the central axis C of the barrel body 211. This discharge section 212 constitutes the tip 21a of the barrel 21.

[0027] The flange portion 213 extends radially outward from the entire circumferential area at the base end of the barrel body 211 in the X-axis direction. The outer edge of the flange portion 213 in this embodiment is circular when viewed from the X-axis direction. The portion of the barrel 21 including the flange portion 213 (end) constitutes the base end portion 21b of the barrel 21.

[0028] The spray nozzle N is the part that sprays the contents filled in the barrel body 211 into the nasal cavity or the like. The spray nozzle N in this embodiment is configured so that the contents (medicinal liquid) are ejected (sprayed) in a mist-like manner.

[0029] As shown in Figure 8, the rod 22 has a pressed portion 262 that is pushed by the operating mechanism 3. The rod 22 extends in the X-axis direction and is made of a resin such as POM (polyacetal). Specifically, the rod 22 comprises a rod body portion 23 that is inserted into the barrel 21 (barrel body 211) from its base end in the X-axis direction and can be pushed toward the tip end in the X-axis direction, and a rod pushing portion 26 having the pressed portion 262.

[0030] As shown in Figures 9 to 11, the rod body 23 comprises a shaft portion 24 and a piston 25 positioned at the tip end of the shaft portion 24 in the X-axis direction.

[0031] The shaft portion 24 comprises a shaft body 241 extending in the X-axis direction, a first locking portion 242 extending from the shaft body 241, and a first-state engaged portion 243 (see Figure 11) and a second-state engaged portion 244 that can engage with the rod pushing portion 26. The shaft portion 24 also comprises a pressure accumulation rib 245 projecting radially from the shaft body 241, a first protruding portion 246 that guides the shaft portion 24 when it is pushed into the barrel 21, and an extension portion 247 extending from the base end of the shaft body 241 in the X-axis direction toward the base end in the X-axis direction.

[0032] The shaft body 241 is an axial portion on which the piston 25 is positioned at the tip end in the X-axis direction. In this embodiment, the shaft body 241 has a pair of planar portions 241a extending in the XZ plane direction (a plane including the X-axis direction and the Z-axis direction) at both ends in the Y-axis direction. These pair of planar portions 241a are planes parallel to each other. In addition, the base end (body base end) 2410 of the shaft body 241 in the X-axis direction has a smaller dimension in the Z-axis direction than other parts.

[0033] The first protrusion 246 projects in the Y-axis direction from the flat portion 241a of the shaft body 241 and extends in the X-axis direction. This first protrusion 246 extends in the X-axis direction from approximately the center of the shaft body 241 to the base end. In this embodiment, the first protrusion 246 is arranged on each of the pair of flat portions 241a. That is, the shaft 24 comprises a pair of first protrusions 246a and 246b.

[0034] The first locking portion 242 is a part that can be locked to the operating mechanism body 32 (see Figure 20). This first locking portion 242 extends from the shaft body 241 so as it moves toward the base end in the X-axis direction, it moves away from the shaft body 241 in the Z-axis direction. In this embodiment, the first locking portions 242 are arranged on both sides of the shaft body 241 in the Z-axis direction. That is, the shaft 24 is provided with a pair of first locking portions 242.

[0035] Specifically, the first locking portion 242 comprises a first portion 2421 extending from the shaft body 241 in the Z-axis direction, a second portion 2422 extending from the tip of the first portion 2421 in an inclined direction (a direction inclined with respect to the central axis C) that moves away from the shaft body 241 in the Z-axis direction as it approaches the base end in the X-axis direction, and a third portion 2423 extending from the base end of the second portion 2422 in the X-axis direction in the same direction as the first portion 2421.

[0036] The second portion 2422 is flexible and bends when the third portion 2423 is pushed toward the shaft body 241.

[0037] The second state engaging portion 244 is the portion to which the rod pushing portion 26 can engage. This second state engaging portion 244 is a portion that protrudes in the Z-axis direction from the base end portion 2410 of the shaft portion body 241. In this embodiment, the second state engaging portion 244 protrudes on both sides in the Z-axis direction from the base end portion 2410 of the body. That is, the shaft portion 24 is provided with a pair of second state engaging portions 244.

[0038] Specifically, the second state engaged portion 244 includes an inclined surface portion 2441 extending from the base end portion 2410 of the main body in an inclined direction (a direction inclined with respect to the central axis C) that moves away from the base end portion 2410 of the main body in the Z-axis direction as it moves toward the base end in the X-axis direction, and a pressed surface portion 2442 extending in the Z-axis direction toward the base end portion 2410 of the main body from the base end end in the X-axis direction of the inclined surface portion 2441. This pressed surface portion 2442 is a surface that extends in the YZ plane direction (a plane including the Y-axis direction and the Z-axis direction).

[0039] The first state engaged portion 243 is the portion to which the rod pushing portion 26 can engage. In this embodiment, the first state engaged portion 243 is formed by the end face on the base end side in the X-axis direction of one of the pair of first protrusions 246a (see Figure 11). Specifically, the first state engaged portion 243 is a surface that extends in the YZ plane direction.

[0040] The pressure accumulating rib 245 is a part that utilizes resistance with other members to accelerate the pushing speed of the rod 22 when the rod 22 is pushed toward the tip side within the barrel 21. The pressure accumulating rib 245 in this embodiment has a first pressure accumulating rib 245a and a second pressure accumulating rib 245b which is positioned at a distance from the first pressure accumulating rib 245a toward the base end in the X-axis direction.

[0041] The first pressure accumulating rib 245a protrudes from the shaft body 241 and extends circumferentially in the area excluding the flat portion 241a of the shaft body 241 in the circumferential direction (i.e., the portion where the cross-sectional contour is arc-shaped) (see Figure 10).

[0042] The second pressure accumulating rib 245b protrudes from the shaft body 241 in the circumferential direction, excluding the flat portion 241a of the shaft body 241 (i.e., the portion where the cross-sectional contour is arc-shaped), and extends in the circumferential direction. The amount of protrusion (radial dimension) of the second pressure accumulating rib 245b from the shaft body 241 is the same as the amount of protrusion of the first pressure accumulating rib 245a from the shaft body 241.

[0043] The extension portion 247 extends along the X-axis direction (central axis C) from the base end of the shaft body 241 in the X-axis direction.

[0044] The piston 25 is a component that can contact the inner surface located on the base end side in the X-axis direction of the tip of the barrel body 211 (the part where the tip end of the barrel body 211 in the X-axis direction is closed, leaving the discharge portion 212 open). This piston 25 is in close contact with the entire circumferential surface of the inner surface of the barrel body 211.

[0045] As shown in Figures 12 and 13, the rod pushing portion 26 includes a rod pushing portion body 261, a pushed portion 262 extending from the rod pushing portion body 261 in the Z-axis direction, a first state engaging portion 263 located at the X-axis end of the rod pushing portion body 261, and a second state engaging portion 264 extending from the rod pushing portion body 261 towards the X-axis end. The rod pushing portion 26 also includes a first locking projection 265 extending from the rod pushing portion body 261 towards the X-axis end. The rod pushing portion 26 also includes a second protrusion 266 that guides the rod pushing portion 26 when it moves in the X-axis direction (central axis C direction) relative to the operating mechanism body 32 (see Figures 16 and 17).

[0046] The rod pushing portion body 261 is a part that is positioned around the rod body 23 (more specifically, the extension portion 247) so as to be movable relative to the rod body 23 in the X-axis direction.

[0047] The pressed portion 262 is the part that is pressed by the operating mechanism 3 when the rod pressing portion 26 moves in the X-axis direction. Specifically, the pressed portion 262 is a plate-shaped part that extends from the rod pressing portion body 261 toward the operating portion 31 in the Z-axis direction and spreads in the XZ plane direction. In this embodiment, the pressed portion 262 has an arc-shaped contact portion 262a that is convex outward when viewed from the Y-axis direction at the base end side in the X-axis direction and at the corner on the operating portion 31 side in the Z-axis direction.

[0048] The first state engaging portion 263 locks the rod pushing portion 26 to the rod body portion 23 by contacting the first state engaged portion 243 (in this embodiment, the end face on the base end side in the X direction of one of the first protrusions 246a) when the rod pushing portion 26 moves toward the tip side in the X direction (the rod pushing portion 26 enters the first state). Specifically, the first state engaging portion 263 is a portion that extends in the Z direction at the tip end side in the X direction of the rod pushing portion body 261. When viewed from the X direction, this first state engaging portion 263 extends in the Z direction at a position that overlaps with one of the first protrusions 246a (see Figure 6).

[0049] The second state engaging portion 264 locks the rod pushing portion 26 to the rod body portion 23 by contacting the second state engaged portion 244 when the rod pushing portion 26 moves toward the tip in the X-axis direction (the rod pushing portion 26 enters the second state). Specifically, the second state engaging portions 264 extend from the rod pushing portion body 261 toward the tip in the X-axis direction at positions facing each second state engaged portion 244 in the Z-axis direction. That is, the rod pushing portion 26 is provided with a pair of second state engaging portions 264.

[0050] Specifically, the second state engaging portion 264 comprises an engaging shaft portion 2641 extending from the rod pushing portion body 261 toward the tip in the X-axis direction, and a contact portion 2642 positioned at the tip end of the engaging shaft portion 2641 toward the X-axis direction and capable of contacting the second state engaged portion 244.

[0051] The engaging shaft portion 2641 is flexible and bends when the contact portion 2642 is pushed away from the shaft body 241.

[0052] The contact portion 2642 protrudes from the X-axis end of the engaging shaft portion 2641 toward the Z-axis shaft body 241, and has a pressing surface portion 2643 at the X-axis end that can make surface contact with the pressed surface portion 2442 of the second state engaged portion 244. This pressing surface portion 2643 is a surface that extends in the YZ plane direction.

[0053] The first locking projection 265 extends from a portion adjacent in the Y-axis direction to the position of the extension portion 247 on the rod pushing portion body 261, when viewed from the X-axis direction, toward the tip in the X-axis direction. This first locking projection 265 is the portion to which the base end of the biasing member S in the X-axis direction is locked (see Figures 5 and 6).

[0054] The second protrusion 266 protrudes from the pressed portion 262 in the Y-axis direction and extends in the X-axis direction. In the rod pressing portion 26 of this embodiment, the second protrusion 266 is arranged on both sides of the pressed portion 262 in the Y-axis direction. That is, the rod pressing portion 26 comprises a pair of second protrusions 266. These pair of second protrusions 266 are arranged on both sides of the pressed portion 262 in the Y-axis direction at the same position in the Z-axis direction.

[0055] The operating mechanism 3 includes an operating section 31 having a pressing section 313 that pushes the pressed section 262 toward the tip in the X-axis direction. The operating mechanism 3 also includes an operating mechanism body 32 that holds the operating section 31 in a rotatable manner.

[0056] The operating unit 31 can be rotated by a rotational operation relative to the operating mechanism body 32 in a direction that intersects the X-axis direction when viewed from the Y-axis direction (intersection direction: see arrow α in Figure 7). Specifically, as shown in Figures 14 and 15, the operating unit 31 comprises a pivot shaft portion 311 which serves as the center of rotation in the rotational operation, an operating body portion 312 extending from the pivot shaft portion 311 in the X-axis direction, and a push portion 313 extending from the operating body portion 312 along the intersection direction α. ​​In this embodiment, the intersection direction α is the direction of rotation with the pivot shaft portion 311 as the center of rotation.

[0057] The operating body 312 is a part or component that is pushed (rotated) by the user's hand so that the operating part 31 enters the operating mechanism body 32 when the injection device 1 is operated.

[0058] The pivot shaft portion 311 is a shaft portion that extends in the Y-axis direction from the tip end of the operating portion 31 in the X-axis direction, and is the part that becomes the pivot center when the operating portion 31 is rotated. In this embodiment, the pivot shaft portion 311 extends from the tip end of the operating portion 31 in the X-axis direction to one side and the other side in the Y-axis direction. That is, the operating portion 31 is equipped with a pair of pivot shaft portions 311.

[0059] The pressing portion 313 is the part that extends from the operating body portion 312 toward the rod pressing portion 26 in the Z-axis direction (i.e., in the intersecting direction α). In this embodiment, the pressing portion 313 extends from the central part of the operating body portion 312 in the Y-axis direction toward the rod pressing portion 26 in the Z-axis direction. In this pressing portion 313, the end edge 313a on the tip side in the X-axis direction contacts the pressed portion 262 (more specifically, the contact portion 262a of the pressed portion 262). This end edge 313a is an arc shape that is convex toward the pressed portion 262 when viewed from the Y-axis direction.

[0060] The pushing portion 313 of this embodiment has a rotation restricting portion 314 extending from the end on the rod pushing portion 26 side in the Z-axis direction toward the base end in the X-axis direction. This rotation restricting portion 314 contacts the main body of the operating mechanism 32 (see Figure 4) to restrict further rotation of the operating portion 31 (more specifically, rotation in the opposite direction to the rotation operation that moves the rod pushing portion 26 toward the tip side in the X-axis direction).

[0061] The operating mechanism body 32 is a part or member that holds the operating part 31 so as to be rotatable around the pivot shaft 311 and holds the rod 22 so as to be movable in the X-axis direction. Specifically, as shown in Figures 16 and 17, the operating mechanism body 32 includes a pivot shaft holding part 321 that holds the pivot shaft 311, a first guide groove 322 into which the first protrusion 246 of the rod body 23 fits, and a second guide groove 323 into which the second protrusion 266 of the rod pushing part 26 fits. The operating mechanism body 32 also includes a first locking part 324 into which the first locking part 242 of the rod body 23 is locked. In this embodiment, the operating mechanism body 32 has two members (divided members) 3201 and 3202 that sandwich the rod 22 in the Y-axis direction.

[0062] Furthermore, the main body 32 of the operating mechanism is provided with a second locking projection 325 that faces the first locking projection 265 of the rod pushing portion 26 in the X-axis direction. In addition, the main body 32 of the operating mechanism (divided member 3202) is provided with a pressure accumulation wall portion 326 having a hole portion 326a through which the rod main body portion 23 passes.

[0063] The pivot shaft holding portion 321 holds the pivot shaft portion 311 so that the operating portion 31 can rotate around the pivot shaft portion 311. In this embodiment, the pivot shaft holding portion 321 extends in the Y-axis direction and is a hole into which the pivot shaft portion 311 is inserted, and is arranged in each of the divided members 3201 and 3202. That is, the operating mechanism body 32 is equipped with a pair of pivot shaft holding portions 321.

[0064] The first guide groove 322 is recessed in the direction away from the shaft body 241 in the Y-axis direction and extends in the X-axis direction. This first guide groove 322 guides the direction of movement of the rod body 23 when the rod body 23 moves with the first protrusion 246 fitted into it. In this embodiment, the first guide groove 322 is positioned on the opposing surfaces 3201a and 3202a of the divided members 3201 and 3202, respectively, at positions corresponding to the first protrusion 246 of the rod body 23. That is, the operating mechanism body 32 is equipped with a pair of first guide grooves 322.

[0065] The second guide groove 323 is recessed in the direction away from the pressed portion 262 in the Y-axis direction and extends in the X-axis direction. This second guide groove 323 guides the direction of movement of the rod pressing portion 26 when the rod pressing portion 26 moves with the second protrusion 266 fitted into it. In this embodiment, the second guide groove 323 is positioned on the opposing surfaces 3201a and 3202a of the divided members 3201 and 3202a, respectively, corresponding to the second protrusion 266 of the pressed portion 262. That is, the operating mechanism body 32 is equipped with a pair of second guide grooves 323.

[0066] The first locking portion 324 is the portion to which the first locking portion 242 of the rod body portion 23 is locked after the first locking portion 242 has passed towards the tip side in the X-axis direction. Specifically, the first locking portion 324 comprises an inclined surface portion 3241 that extends in an inclined direction (a direction inclined with respect to the central axis C) that approaches the shaft body portion 241 as it moves toward the tip side in the X-axis direction, and a locking surface portion 3242 that extends from the tip end of the inclined surface portion 3241 in the X-axis direction toward the shaft body portion 241 in the Z-axis direction. In this embodiment, the first locking portion 324 is positioned in the Z-axis direction opposite to each of the pair of first locking portions 242 (see Figure 18A). That is, the operating mechanism body 32 comprises a pair of first locking portions 324.

[0067] The second locking projection 325 extends from a position on the X-axis side of the rod pushing portion 26 that is closer to the tip of the first locking projection 265 and opposite the first locking projection 265 in the X-axis direction, towards the base end in the X-axis direction (see Figures 5 and 6). This second locking projection 325 is the part to which the tip end of the biasing member S in the X-axis direction is locked.

[0068] The hole 326a in the pressure accumulation wall 326 is a part that creates resistance when the pressure accumulation rib 245 of the rod body 23 passes through, and the inner diameter of the hole 326a is slightly smaller than the outer diameter of the parts of the rod body 23 where the respective pressure accumulation ribs 245a and 245b are formed.

[0069] The biasing member S is a member that biases the rod pushing portion 26 toward the base end in the X-axis direction when the rod 22 is pushed into the barrel 21 by the rotational operation of the operating portion 31. In this embodiment, the biasing member S is a coil spring, with the first locking projection 265 of the rod pushing portion 26 inserted from the base end toward the tip end in the X-axis direction, and the second locking projection 325 of the operating mechanism body 32 inserted from the tip end toward the base end in the X-axis direction (see Figures 5 and 6). This biasing member S is compressed when the rod 22 is pushed into the barrel 21 and the distance between the first locking projection 265 and the second locking projection 325 in the X-axis direction decreases (see Figures 20 and 24).

[0070] The barrel position restricting unit 4 restricts (holds) the position (movement) of the barrel 21. Specifically, the barrel position restricting unit 4 includes an axial restricting unit 41 that restricts the movement of the barrel 21 at least toward the tip in the X-axis direction, and a radial restricting unit 42 that restricts the radial position (movement) of the barrel 21.

[0071] The axial restricting portion 41 restricts the movement of the barrel 21 toward the tip and base ends in the X-axis direction by clamping the flange portion 213 of the barrel 21 in the X-axis direction.

[0072] The radial restricting portion 42 restricts the radial movement of the barrel 21 by surrounding the barrel body 211. The radial restricting portion 42 is positioned towards the tip in the X-axis direction relative to the axial restricting portion 41.

[0073] Next, we will explain the operation of the injection device 1.

[0074] The user holds the injection device 1 in their hand, inserts the spray nozzle N into their nostril, and in that position, pushes (rotates) the operating part 31 in a direction α perpendicular to the operating mechanism body 32 with their hand.

[0075] This rotational operation causes the operating unit 31 to rotate around the pivot shaft 311 from the starting position P1 to the ending position P2. In other words, the operating unit 31 is pushed in a direction α perpendicular to the operating mechanism body 32. Here, the starting position P1 is the starting position of the operation of the operating unit 31 (the position shown in Figure 4), and the ending position P2 is the ending position of the operation of the operating unit 31 (the position shown in Figure 20).

[0076] The rotation of the operating unit 31 causes the pushing portion 313 of the operating unit 31 to push the pressed portion 262 of the rod pushing portion 26. As a result, the rod pushing portion 26 moves from the starting position P11 to the ending position P12. Here, the starting position P11 is the starting point of the movement of the rod pushing portion 26 (the position shown in Figure 4), and the ending position P12 is the ending point of the movement of the rod pushing portion 26 (the position shown in Figure 20).

[0077] At this time, the rod pushing portion 26 is sandwiched between the opposing surfaces 3201a and 3202a of the divided members 3201 and 3202 in the operating mechanism body 32, and each second protrusion 266 is fitted into the second guide groove 323, so the portion to be pushed 262 is pushed by the pushing portion 313 of the operating portion 31, and is guided (moves) toward the tip in the X-axis direction.

[0078] When the rod pushing portion 26 moves toward the tip in the X-axis direction, the first state engaging portion 263 comes into contact with (engages with) the first state engaged portion 243 of the rod body portion 23 (the end face on the base end side in the X-axis direction of one of the first protrusions 246a). That is, the rod pushing portion 26 enters the first state (see Figures 18A and 18B).

[0079] In this state, when the operating unit 31 is further rotated toward the end position P2, the rod pushing unit 26 moves toward the tip in the X-axis direction. However, because the first state engaging unit 263 pushes the first state engaged unit 243 toward the tip in the X-axis direction, the rod body unit 23 also moves toward the tip in the X-axis direction together with the rod pushing unit 26. That is, the rod body unit 23 is pushed into the barrel 21 (see Figures 18A to 20).

[0080] As the rod body 23 moves, the third portion 2423 of each first locking portion 242 is pressed against the inclined surface portion 3241 of the first locked portion 324, causing the first locking portion 242 (second portion 2422) to bend (elastically deform) (see Figure 19), and the rod body 23 continues to move toward the tip in the X-axis direction.

[0081] Then, when the operating section 31 is rotated to the end position P2 and the rod pushing section 26 moves to the end position P12 while remaining in the first state, the third portion 2423 of each first locking section 242 passes over the first locked section 324 in the X-axis direction, and the bent first locking section 242 (second portion 2422) returns to its original position, so that the third portion 2423 faces the locked surface portion 3242 of the first locked section 324 in the X-axis direction (see Figure 20). In this way, the rod body 23 (shaft body 241) is pushed against the barrel 21 to the first push-in position (predetermined push-in position) P21.

[0082] In this way, as the rod body 23 is pushed into the barrel 21 to the first push-in position P21, a portion (about half) of the contents (liquid) filled in the barrel 21 is ejected from the spray nozzle N. During the pushing of the rod body 23 into the barrel 21 during this ejection, the first pressure accumulating rib 245a passes through the hole 326a of the pressure accumulating wall 326. However, since the inner diameter of the hole 326a is slightly smaller than the outer diameter of the part of the rod body 23 where the first pressure accumulating rib 245a is formed, the rod body 23 is accelerated as the first pressure accumulating rib 245a passes through the hole 326a of the pressure accumulating wall 326, and the liquid is suitably sprayed from the spray nozzle N.

[0083] After the first injection of the contents (liquid), the rod pushing portion 26 has moved to its final position P12. As a result, the distance between the first locking projection 265 of the rod pushing portion 26 and the second locking projection 325 of the operating mechanism body 32 in the X-axis direction has decreased, and the biasing member S is compressed in the X-axis direction.

[0084] In this state, when the user releases the force α applied to the operating section 31 in the direction of the intersecting direction (a force pushing the operating section 31 toward the operating mechanism body 32), the biasing member S pushes the rod pushing section 26 toward the base end in the X-axis direction by elastic force, causing the rod pushing section 26 to move toward the base end in the X-axis direction (i.e., it moves from the end point of movement P12 toward the start point of movement P11).

[0085] When the rod pushing portion 26 moves, the rod body portion 23 does not move toward the base end in the X-axis direction (i.e., it maintains its position) because the first locking portion 242 is locked to the first locked portion 324, while the rod pushing portion 26 moves toward the base end in the X-axis direction (see Figures 20 to 22).

[0086] At this time, as the rod pushing portion 26 moves, the contact portion 2642 of each second state engaging portion 264 is pressed against the inclined surface portion 2441 of the second state engaged portion 244, causing the second state engaging portion 264 (engaging shaft portion 2641) to bend (elastically deform) (see Figure 21), and the rod pushing portion 26 continues to move toward the base end in the X-axis direction.

[0087] Furthermore, when the rod pushing portion 26 moves from the end position P12 towards the start position P11 (i.e., moves towards the base end in the X-axis direction), the pushed portion 262 of the rod pushing portion 26 pushes the pushing portion 313 of the operating portion 31, causing the operating portion 31 to rotate from the end position P2 towards the start position P1 (see Figures 20 to 22).

[0088] Then, when the operating unit 31 rotates to the starting position P1, that is, when the rod pushing unit 26 moves to the starting position P11, the contact portion 2642 of each second state engaging portion 264 passes over the second state engaged portion 244 in the X-axis direction, and the bent second state engaging portion 264 (engaging shaft portion 2641) returns to its original position, so that the contact portion 2642 faces the pressed surface portion 2442 of the second state engaged portion 244 in the X-axis direction (see Figure 22).

[0089] Next, the user inserts the spray nozzle N into the nostril opposite to the one from which the first contents (liquid medicine) were sprayed, and in that state, pushes (rotates) the operating unit 31 in a direction α perpendicular to the operating mechanism body 32. This rotation of the operating unit 31 causes the pushing part 313 of the operating unit 31 to push the pressed part 262 of the rod pushing part 26, causing the rod pushing part 26 to move from the starting position P11 to the ending position P12.

[0090] When the rod pushing portion 26 moves toward the tip in the X-axis direction, the pushing surface portion 2643 (contact portion 2642) of the second state engaging portion 264 comes into contact with (engages with) the pressed surface portion 2442 of the second state engaged portion 244 of the rod body portion 23. That is, the rod pushing portion 26 enters the second state (see Figure 23).

[0091] In this state, when the operating unit 31 is further rotated toward the end position P2, the rod pushing unit 26 moves toward the tip in the X-axis direction. However, because the second state engaging unit 264 (pushing surface 2643) pushes the second state engaged unit 244 (pushed surface 2442) toward the tip in the X-axis direction, the rod body 23 also moves toward the tip in the X-axis direction together with the rod pushing unit 26. That is, the rod body 23 is pushed further into the barrel 21 from the first pushing position P21 (see Figures 23-24).

[0092] Then, when the operating section 31 is rotated to the end position P2 and the rod pushing section 26 moves to the end position P12 while remaining in the second state, the rod body 23 (shaft body 241) is pushed against the barrel 21 to the second pushing position P22. The second pushing position P22 is a position closer to the tip in the X-axis direction than the first pushing position P21.

[0093] In this way, as the rod body 23 is pushed into the barrel 21 to the second push-in position P22, the remaining contents (liquid) that were filled in the barrel 21 (about half) are ejected from the spray nozzle N. That is, a second injection of the contents (liquid) takes place. During the pushing of the rod body 23 into the barrel 21 for this injection, the second pressure accumulating rib 245b passes through the hole 326a of the pressure accumulating wall 326. However, since the inner diameter of the hole 326a is slightly smaller than the outer diameter of the part of the rod body 23 where the second pressure accumulating rib 245b is formed, the rod body 23 is accelerated as the second pressure accumulating rib 245b passes through the hole 326a of the pressure accumulating wall 326, and the contents (liquid) are suitably sprayed from the spray nozzle N.

[0094] As described above, the injection device 1 can dispense the drug solution in two separate injections.

[0095] The injection device 1 described above comprises a syringe 2 having a tip portion 21a and a base portion 21b in the X-axis direction (axial direction), a barrel 21 from which contents can be discharged from the tip portion 21a, and a rod 22 that is inserted into the barrel 21 from the base end and can be pushed toward the tip, and an operating mechanism 3 for operating the rod 22. The rod 22 includes a portion to be pressed 262, and the operating mechanism 3 comprises an operating unit 31 having a pushing portion 313 that pushes the portion to be pressed 262 toward the tip in the X-axis direction, and the operating unit 31 is configured to be operable in an intersecting direction α that intersects with the X-axis direction, and when the operating unit 31 is operated in the intersecting direction α, the pushing portion 313 pushes the portion to be pressed 262 toward the tip, and the rod 22 is pushed toward the tip.

[0096] With this configuration, the rod 22 can be pushed toward the tip of the barrel 21 along the X-axis direction by operating the operating part 31 in the intersecting direction α. ​​Therefore, when pushing the rod 22, the position of the tip 21a of the barrel 21 is less likely to shift and is easier to maintain.

[0097] In the injection device 1 of this embodiment, the operating section 31 is arranged in parallel with the rod 22 before it is pushed in, in a radial direction perpendicular to the X-axis direction (axial direction). By arranging the operating section 31 and the rod 22 before it is pushed in parallel in a radial direction perpendicular to the X-axis direction in this way, the operating section 31 is easy to operate.

[0098] Furthermore, the injection device 1 of this embodiment includes a barrel position restricting unit 4 that restricts the position of the barrel 21. The barrel position restricting unit 4 includes an axial restricting unit 41 that restricts the movement of the barrel 21 at least toward the tip in the X-axis direction (axial direction), and a radial restricting unit 42 that restricts the radial position of the barrel 21. The radial restricting unit 42 is positioned toward the tip side relative to the axial restricting unit 41, and the pushing unit 313 is positioned toward the base end side relative to the axial restricting unit 41.

[0099] Thus, a radial restricting portion 42 that restricts the radial position of the barrel 21 is positioned at the tip of the axial restricting portion 41 that restricts the movement of the barrel 21 at least toward the tip in the X-axis direction, and a pushing portion 313 is positioned at the base end of the axial restricting portion 41 in the X-axis direction. This makes it easier to maintain the position of the syringe 2 relative to the operating mechanism 3 when operating the operating portion 31 to push in the rod 22.

[0100] Furthermore, in the injection device 1 of this embodiment, the operating unit 31 is configured to be rotatable in the intersecting direction α by a rotational operation, and comprises a pivot shaft portion 311 which serves as the pivot center in the rotational operation, an operating body portion 312 extending from the pivot shaft portion 311 in the X-axis direction (axial direction), and a pressing portion 313 extending from the operating body portion 312 in the intersecting direction α.

[0101] With this configuration, when the operating part 31 is operated, the pushing part 313, which rotates in the intersecting direction α at a position away from the pivot shaft part 311, can push the rod 22 toward the tip in the X-axis direction. Therefore, due to the lever principle, the rod 22 can be smoothly pushed in even with a small force. Further details are as follows.

[0102] In the operating section 31, the operating body 312 extends from the pivot shaft 311, and the pushing section 313 extends from the operating body 312 in the intersecting direction α. ​​Therefore, the pushing section 313 is positioned at a distance in the X-axis direction from the pivot shaft 311 by the amount that the operating body 312 extends. At this distance, it rotates in the intersecting direction α by a rotational operation, pushing the pressed portion 262 of the rod 22 toward the tip in the X-axis direction. This allows the base end of the rod 22 to be pushed using the lever principle, and the rod 22 can be smoothly pushed into the barrel 21 with little force.

[0103] Furthermore, the injection device 1 of this embodiment includes a biasing member S, and the rod 22 includes a rod body portion 23 that is inserted into the barrel 21 from the base end side and can be pushed toward the tip side, and a rod pushing portion 26 that has a pushed portion 262. The rod pushing portion 26 is configured to be changeable from a first state in which it is locked to the rod body portion 23 at a predetermined position in the X-axis direction (axial direction) (see Figures 18A and 18B) to a second state in which it is locked to the rod body portion 23 at a position toward the base end in the X-axis direction from the predetermined position (see Figure 23). The syringe 2 is configured to perform administration (see Figure 20) in which the rod body portion 23 is pushed toward the barrel 21 to a first pushing position (predetermined pushing position) P21 when the rod pushing portion 26 is in the first state, and rod pushing After part 26 changes from the first state to the second state, the rod body part 23 is further pushed against the barrel 21 from the first push position P21 (see Figure 24), thereby enabling the contents to be administered in portions. When the operating part 31 is operated in the intersecting direction α from the operation start position P1, which is the starting point of the operation, the pressed part 262 is pushed by the pushing part 313, causing the rod pushing part 26 to move from the movement start position P11, which is the starting point of the movement of the rod pushing part 26, toward the tip in the X-axis direction. The biasing member S then biases the rod pushing part 26 to return from the destination to the movement start position P11 after administration in the first state, and also biases the operating part 31 to return from the operation end position (position after operation) P2 to the operation start position P1. As the rod pushing part 26 returns to the movement start position P11 due to the biasing, it changes from the first state to the second state, enabling administration in the second state in syringe 2.

[0104] With this configuration, the contents of syringe 2 (in this embodiment, the drug solution) can be administered in portions by repeating the same operation on the operating unit 31. Specifically, when the rod pushing unit 26 moves from the first state to the second state, the biasing force of the biasing member S causes the rod pushing unit 26 to return to the starting position P11 and the operating unit 31 to return to the starting position P1. As a result, after the contents of syringe 2 are administered by operating the operating unit 31 when the rod pushing unit 26 is in the first state, the biasing force of the biasing member S causes the rod pushing unit 26 to return to the starting position P11 and the operating unit 31 to return to the starting position P1, and the rod pushing unit 26 enters the second state. This makes it possible to administer the contents of syringe 2 in the second state, and as a result, the contents of syringe 2 can be administered in portions by repeating the same operation.

[0105] Next, a second embodiment of the present invention will be described with reference to Figures 25 to 50C. The same reference numerals will be used for components similar to those in the first embodiment, and detailed explanations will be omitted. Only the different components will be described in detail.

[0106] The injection device of this embodiment, like the injection device 1 of the first embodiment, can administer the contents (in this example, drug solution) filled inside the syringe into the nasal cavity or oral cavity in multiple doses. The injection device of this embodiment, like the injection device 1 of the first embodiment, administers the contents (drug solution) in two doses, but it may also administer them in three or more doses.

[0107] Specifically, as shown in Figures 25 to 30, the injection device 1A comprises a syringe 2A and an operating mechanism 3A having an operating section 31A. The injection device 1A also includes a biasing member S. The injection device 1A also includes a barrel position regulating section 4A.

[0108] As shown in Figure 31, syringe 2A comprises a barrel 21 having a tip portion 21a and a base portion 21b in the X-axis direction (central axis C direction), and a rod 22A inserted into the barrel 21. Syringe 2A also includes a spray nozzle N positioned at the tip portion 21a of the barrel 21. Syringe 2A in this embodiment includes a barrel holder portion 27 for holding the barrel 21.

[0109] As shown in Figures 32 to 34, the barrel holding portion 27 comprises a holding portion body 271, a second locking portion 272 protruding from the holding portion body 271 in the Y-axis direction, and a clamping portion 273 that clamps the flange portion 213 of the barrel body 211. The barrel holding portion 27 of this embodiment is provided with a pressure accumulation wall portion 274 at the base end of the holding portion body 271 in the X-axis direction, which has a hole 274a through which the shaft portion body 241A (see Figure 35) of the rod body portion 23A passes. Furthermore, the barrel holding portion 27 of this embodiment is provided with a biasing member locking portion 275 at the tip end of the holding portion body 271 in the X-axis direction, which locks the biasing member S. The position of the barrel holding portion 27 in the X-axis direction relative to the barrel 21 is fixed.

[0110] The retaining body 271 extends in the X-axis direction and surrounds a portion of the barrel body 211 in the circumferential direction. This retaining body 271 has outer surfaces 271a that extend in the XZ plane direction at both ends in the Y-axis direction of the portion excluding the tip end in the X-axis direction (biasing member locking portion 275). In this embodiment, one side of the retaining body 271 in the Z-axis direction is open (open).

[0111] The pressure accumulation wall portion 274 expands in the YZ direction, and the hole portion 274a of the pressure accumulation wall portion 274 penetrates in the X direction (see Figure 34). This hole portion 274a is a part that creates resistance when the pressure accumulation ribs 245 (first pressure accumulation rib 245a, second pressure accumulation rib 245b: see Figure 35) of the rod body portion 23A pass through, and the inner diameter of the hole portion 274a is slightly smaller than the outer diameter of the parts of the rod body portion 23A where each pressure accumulation rib 245a, 245b is formed.

[0112] The biasing member locking portion 275 comprises a locking plate portion 2751 that extends in the YZ direction and a locking projection portion 2753 that extends from the locking plate portion 2751 toward the base end in the X direction.

[0113] The locking plate portion 2751 includes a notch portion 2752 into which the barrel 21 is positioned, and the locking projection portion 2753 extends toward the base end in the X-axis direction, enclosing a part of the circumferential direction of the barrel body 211 (see Figure 32).

[0114] In the biasing member locking portion 275 configured in this way, the locking projection 2753 is inserted from the tip end in the X-axis direction of the biasing member S toward the base, and the tip end in the X-axis direction of the biasing member S comes into contact with the locking plate portion 2751, thereby locking the tip end in the X-axis direction of the biasing member S (see Figure 28).

[0115] The second locking portion 272 is a part that protrudes from the holding portion body 271 in the Y-axis direction. In this embodiment, the second locking portion 272 protrudes from each outer surface 271a of the holding portion body 271 in the Y-axis direction. That is, the barrel holding portion 27 is provided with a pair of second locking portions 272.

[0116] Specifically, the second locking portion 272 includes a first surface portion 2721 extending from the outer surface 271a of the holding portion body 271 in an inclined direction (a direction inclined with respect to the central axis C) that moves away from the outer surface 271a in the Y direction as it moves toward the tip side in the X direction, a second surface portion 2722 extending from the tip side of the first surface portion 2721 in the X direction toward the tip side in the X direction, and a third surface portion 2723 extending in the Y direction from the tip side of the second surface portion 2722 toward the outer surface 271a. In this embodiment, the second surface portion 2722 is a surface that extends in the XZ plane direction, and the third surface portion 2723 is a surface that extends in the YZ plane direction.

[0117] The clamping portion 273 is connected to the base end of the holding portion body 271 in the X-axis direction, and by clamping the flange portion 213 of the barrel 21 in the X-axis direction (see Figure 32), it restricts the movement of the barrel 21 toward the tip end in at least the X-axis direction (central axis C direction). In this embodiment, the clamping portion 273 restricts the movement of the barrel 21 toward both the tip end and the base end in the X-axis direction.

[0118] The barrel 21 comprises a barrel body 211, a discharge section 212, and a flange section 213.

[0119] The rod 22A comprises a rod body portion 23A that is inserted into the barrel 21 (barrel body 211) from the base end and can be pushed toward the tip end, and a rod pushing portion 26A having a pushed portion 262A.

[0120] As shown in Figure 35, the rod body 23A comprises a shaft portion 24A and a piston 25 positioned at the tip of the shaft portion 24A.

[0121] The shaft portion 24A comprises a shaft body 241A extending in the X-axis direction, a second locking portion 248 extending from the shaft body 241A, and a first-state engaged portion 243A and a second-state engaged portion 244A that can engage with the rod pushing portion 26A. The shaft portion 24A also includes pressure accumulating ribs 245 (first pressure accumulating rib 245a, second pressure accumulating rib 245b) projecting radially from the shaft body 241A.

[0122] The shaft body 241A is an axial portion on which the piston 25 is positioned at the tip end in the X-axis direction, and has a pair of planar portions 241a at both ends in the Y-axis direction. In the shaft body 241A of this embodiment, the dimension of the base end portion 2410A in the Y-axis direction is larger than that of other parts of the shaft body 241A.

[0123] The second locking portion 248 extends from the shaft body 241A toward the tip in the X-axis direction. In this embodiment, the second locking portion 248 extends on both sides in the Y-axis direction from the base end portion of the shaft body 241A, which is closer to the center in the X-axis direction. That is, the shaft 24A is provided with a pair of second locking portions 248.

[0124] Specifically, the second locking portion 248 comprises a fourth portion 2481 extending in the Y-axis direction from the shaft body 241A, a fifth portion 2482 extending from the tip of the fourth portion 2481 toward the tip in the X-axis direction, and a sixth portion 2483 extending in an inclined direction (a direction inclined with respect to the central axis C) that approaches the shaft body 241A side as it moves from the tip end in the X-axis direction toward the base end in the X-axis direction of the fifth portion 2482. This second locking portion 248 is flexible, and when the sixth portion 2483 is pushed away from the shaft body 241A in the Y-axis direction, the sixth portion 2483 bends so that it approaches the fifth portion 2482 (see Figure 46A).

[0125] Furthermore, the fifth portion 2482 includes a third protruding ridge 2484 that protrudes in the Y-axis direction from the outer surface in the Y-axis direction (opposite the side of the shaft portion body 241A) and extends in the X-axis direction.

[0126] The first state engaged portion 243A is the portion to which the rod pushing portion 26A can engage. In this embodiment, the first state engaged portion 243A is formed by the base end side in the X-axis direction of the fourth portion 2481 of the second locking portion 248. The rod body portion 23A in this embodiment is provided with a pair of first state engaged portions 243A. Each first state engaged portion 243A is a surface that extends in the YZ plane direction.

[0127] As shown in Figures 36 and 37, the second state engaged portion 244A is the portion to which the rod pushing portion 26A can engage. In this embodiment, the second state engaged portion 244A extends from the base end in the X-axis direction of the shaft body 241A to one side and the other side in the Y-axis direction. That is, the rod body portion 23A is provided with a pair of second state engaged portions 244A.

[0128] Specifically, the second state engaged portion 244A comprises a flexible portion 2443 extending from the base end portion 2410a (shaft portion body 241A) of the main body, a projection 2444 protruding from the flexible portion 2443, and a plate-like portion 2445 extending from the flexible portion 2443.

[0129] The flexible portion 2443 extends in an inclined direction (a direction inclined with respect to the central axis C) so as it approaches the base end in the X-axis direction, it moves away from the base end 2410A (shaft body 241A). This flexible portion 2443 is flexible and bends when its end on the base end in the X-axis direction is pushed toward the base end 2410A of the main body.

[0130] The projection 2444 protrudes in the Z-axis direction from the base end in the X-axis direction of the flexible portion 2443. In this embodiment, the projection 2444 protrudes from the base end of the flexible portion 2443 to one side and the other side in the Z-axis direction. Each projection 2444 in this embodiment has an inclined surface portion 2444a that, when viewed from the Z-axis direction, extends in an inclined direction away from the main body base end portion 2410A in the Y-axis direction as it approaches the base end in the X-axis direction.

[0131] The plate-like portion 2445 is a plate-like part that extends outward from the flexible portion 2443 in the Y-axis direction. This plate-like portion 2445 is a plate-like part that extends in the XY plane (a plane that includes the X-axis direction and the Y-axis direction).

[0132] As shown in Figures 38 to 41, the rod pressing section 26A comprises a cylindrical rod pressing section body 261A and a pressed section 262A that protrudes from the rod pressing section body 261A in the Y-axis direction.

[0133] The rod pushing section body 261A is cylindrical in shape and extends in the X-axis direction, with the portion of the rod body 23A including the base end in the X-axis direction being inserted inward. Specifically, the rod pushing section body 261A comprises a cylindrical first cylindrical section 2611 and a second cylindrical section 2612 that extends from the base end in the X-axis direction of the first cylindrical section 2611 and has a smaller inner diameter than the first cylindrical section 2611.

[0134] Inside the rod pushing section body 261A, a stepped surface extending in the YZ direction is formed at the boundary between the first cylindrical section 2611 and the second cylindrical section 2612 (see Figures 40 and 41), and this stepped surface constitutes the first state engaging section 2613. In other words, the rod pushing section body 261A includes the first state engaging section 2613.

[0135] The first state engaging portion 2613 locks the rod pushing portion 26A to the rod body portion 23A by coming into contact with the first state engaged portion 243A (the base end surface in the X-axis direction of the fourth portion 2424 of the second locking portion 248) when the rod pushing portion 26A moves toward the tip in the X-axis direction (the rod pushing portion 26A enters the first state).

[0136] The first cylindrical portion 2611 has a third guide groove 2611b on its inner circumferential surface 2611a into which the third protrusion 2484 of the fifth portion 2482 of the second locking portion 248 of the rod body portion 23A fits.

[0137] The third guide groove 2611b is recessed away from the shaft portion 24A in the Y-axis direction and extends in the X-axis direction. This third guide groove 2611b guides the direction of movement of the shaft portion 24A when the shaft portion 24 moves with the third protrusion 2484 fitted inside. In this embodiment, the third guide groove 2611b is positioned on the inner circumferential surface 2611a at positions corresponding to the pair of third protrusions 2484 on the shaft portion 24A. That is, the first cylindrical portion 2611 of the rod pushing portion 26A is provided with a pair of third guide grooves 2611b.

[0138] The second cylindrical portion 2612 comprises a pair of openings 2614 that penetrate in the Y-axis direction at portions facing each other in the Y-axis direction with respect to the central axis C, and a second state engaging portion 2615 that protrudes from the opening peripheral edge portion 2614a that defines the openings 2614.

[0139] The opening 2614 extends in the X-axis direction, and the plate-shaped portion 2445 of the second state engaged portion 244A of the rod body portion 23A is inserted into the opening 2614 from the inside to the outside of the second cylindrical portion 2612 (see Figure 31). In this embodiment, the opening 2614 is a long rectangle in the X-axis direction when viewed from the Y-axis direction. More specifically, the opening 2614 extends in the X-axis direction from the boundary between the second cylindrical portion 2612 and the first cylindrical portion 2611 to the base end of the second cylindrical portion 2612 in the X-axis direction.

[0140] The second state engaging portion 2615 engages with the rod body portion 23A by contacting the projection 2444 of the second state engaged portion 244A when the rod pushing portion 26A moves toward the tip in the X-axis direction, thereby locking the rod pushing portion 26A to the rod body portion 23A (the rod pushing portion 26A enters the second state). Specifically, the second state engaging portion 2615 protrudes from opposing positions in the Z-axis direction toward each other at each opening peripheral edge portion 2614a. That is, a pair of second state engaging portions 2615 are arranged at each opening peripheral edge portion 2614a. In this embodiment, the second state engaging portion 2615 is positioned at the opening peripheral edge portion 2614a, closer to the base end than the center in the X-axis direction. The second state engaging portion 2615 is a prismatic shape extending in the Z-axis direction, and the distance β (see Figure 41) between two opposing second state engaging portions 2615 in the Z-axis direction is slightly greater than the thickness (dimension in the Z-axis direction) of the plate-shaped portion 2445 of the second state engaged portion 244A in the rod body portion 23A.

[0141] The pressed portion 262A protrudes in the Y-axis direction from the X-axis end of the rod pressing portion body 261A, in other words, from the X-axis end of the first cylindrical portion 2611. In this embodiment, the pressed portion 262A protrudes from the outer circumferential surface of the first cylindrical portion 2611 to one side and the other side in the Y-axis direction. That is, the rod pressing portion 26A comprises a pair of pressed portions 262A.

[0142] At least the base end of each pressed portion 262A in the X-axis direction is an arc shape that is convex toward the base end in the X-axis direction when viewed from the Y-axis direction, and constitutes a contact portion 2621. In addition, the end face 2621a in the Y-axis direction of the pressed portion 262A is a surface that extends in the XZ plane direction, and the pressed portion 262A has a fourth convex ridge portion 2621b that protrudes from the end face 2621a in the Y-axis direction and extends in the X-axis direction.

[0143] The operating mechanism 3A comprises an operating section 31A having a push portion 313A, and an operating mechanism body 32A that holds the operating section 31A in a rotatable manner (see Figure 30).

[0144] As shown in Figures 42 and 43, the operating section 31A comprises a pivot shaft portion 311A, an operating body portion 312, and a push portion 313A. The operating section 31A also has a rotation restricting portion 314A that extends from the end of the operating body portion 312 on the X-axis side toward the X-axis side toward the X-axis side.

[0145] The pivot shaft portion 311A ​​is a shaft portion that extends in the Y-axis direction from the base end of the operating portion 31A in the X-axis direction. In this embodiment, the pivot shaft portion 311A ​​extends from the base end of the operating portion 31A in the X-axis direction to one side and the other side in the Y-axis direction. That is, the operating portion 31A comprises a pair of pivot shaft portions 311A.

[0146] In this embodiment, the push portion 313A extends from both ends of the operating body portion 312 in the Y-axis direction toward the rod push portion 26A in the Z-axis direction (intersecting direction α: see Figure 30). That is, the operating portion 31A is equipped with a pair of push portions 313A.

[0147] The leading edge 313a of each pressing portion 313A in the X-axis direction contacts the pressed portion 262A (more specifically, the contact portion 2621 of the pressed portion 262A), and the edge 313a is an arc shape that is convex toward the pressed portion 262A when viewed from the Y-axis direction.

[0148] As shown in Figures 44 and 45, the operating mechanism body 32A includes a pivot shaft holding portion 321 and a fourth guide groove 327 into which the fourth protrusion 2621b of the rod pushing portion 26A fits. The operating mechanism body 32A has two members (divided members) 3201A and 3202A that sandwich the rod 22A in the Y-axis direction.

[0149] The fourth guide groove 327 is recessed in the direction away from the rod pushing portion 26A in the Y-axis direction and extends in the X-axis direction. This fourth guide groove 327 guides the direction of movement of the rod pushing portion 26A when the rod pushing portion 26A moves with the fourth protrusion 2621b fitted into it. In this embodiment, the fourth guide groove 327 is positioned on the opposing surfaces 3201Aa and 3202A of each divided member 3201A and 3202A, respectively, corresponding to the fourth protrusion 2621b of the rod pushing portion 26A. That is, the operating mechanism body 32A is provided with a pair of fourth guide grooves 327.

[0150] The biasing member S is a member that biases the rod pushing portion 26A toward the base end in the X-axis direction when the rod 22A (shaft body 241A) is pushed into the barrel 21 by the operation of the operating portion 31A. The biasing member S in this embodiment is a coil spring and is arranged to surround the barrel 21, the barrel holding portion 27, and the rod body portion 23A. A locking projection 2753 is inserted from the tip toward the base end in the X-axis direction, and the tip abuts against a locking plate portion 2751, while the end on the base end in the X-axis direction abuts against the end face 261Aa on the tip side in the X-axis direction of the rod pushing portion body 261A. This biasing member S is compressed when the shaft body 241A of the rod 22A is pushed into the barrel 21, and the distance between the biasing member locking portion 275 and the rod pushing portion body 261A in the X-axis direction decreases (see Figures 47A to 47C).

[0151] The barrel position restricting section 4A comprises an axial restricting section 41A and a radial restricting section 42A. In this embodiment, the axial restricting section 41A is formed by the clamping section 273 of the barrel holding section 27. The radial restricting section 42A in this embodiment is formed by the X-axis-side end of the operating mechanism section body 32A, and this end surrounds the injection nozzle N of the syringe 2, thereby restricting the radial movement of the barrel 21. The radial restricting section 42A is positioned on the X-axis-side end relative to the axial restricting section 41A.

[0152] Next, we will explain the operation of the injection device 1A.

[0153] Similar to the injection device 1 of the first embodiment, the user holds the injection device 1A in their hand and inserts the spray nozzle N into their nostril. In this position, they push (rotate) the operating unit 31A in a direction α perpendicular to the operating mechanism body 32A with their hand.

[0154] This rotational operation causes the operating unit 31A to rotate around the pivot shaft 311A ​​from the starting position P1 to the ending position P2. In the injection device 1A of this embodiment, as in the injection device 1 of the first embodiment, the starting position P1 is the starting position of the operation of the operating unit 31A (the position shown in Figure 30), and the ending position P2 is the ending position of the operation of the operating unit 31A (the position shown in Figure 47C).

[0155] The rotation of the operating unit 31A causes the pair of pushing parts 313A of the operating unit 31A to push each of the pushed parts 262A of the rod pushing unit 26A. As a result, the rod pushing unit 26A moves from the starting position P11 to the ending position P12. In the injection device 1A of this embodiment, as in the injection device 1 of the first embodiment, the starting position P11 is the starting point of the movement of the rod pushing unit 26A (the position shown in Figure 30), and the ending position P12 is the ending point of the movement of the rod pushing unit 26A (the position shown in Figure 47C).

[0156] At this time, the rod pushing portion 26A is sandwiched between the opposing surfaces 3201Aa and 3202A of the divided members 3201A and 3202A in the operating mechanism body 32A, and each of the fourth protrusions 2621b is fitted into the fourth guide groove 327, so that the rod pushing portion 26A is guided (moves) toward the tip in the X-axis direction.

[0157] Thus, when the operating part 31A is rotated and the rod pushing part 26A moves toward the tip in the X-axis direction, the first state engaging part 2613 comes into contact with (engages with) the first state engaged part 243A of the rod body part 23A (the base end surface in the X-axis direction of the fourth part 2481 of the second locking part 248). That is, the rod pushing part 26A enters the first state (see Figures 46A and 46B).

[0158] In this state, when the operating part 31A is further rotated toward the operating end position P2, the rod pushing part 26A moves toward the tip in the X-axis direction. However, because the first state engaging part 2613 pushes the first state engaged part 243A toward the tip in the X-axis direction, the rod body part 23A also moves toward the tip in the X-axis direction together with the rod pushing part 26A. That is, the rod body part 23A (more specifically, the shaft body part 241A) is pushed into the barrel 21 (from the state shown in Figures 28, 29, and 30 to the state shown in Figures 46A and 46B).

[0159] Furthermore, in the injection device 1A of this embodiment, even if the rod body 23A and the rod pushing portion 26A move in the X-axis direction relative to the operating mechanism body 32A (relative movement), the barrel holding portion 27 does not move in the X-axis direction relative to the operating mechanism body 32A. That is, in the injection device 1A, the position of the barrel holding portion 27 in the X-axis direction relative to the operating mechanism body 32A is fixed.

[0160] As the rod body 23A moves, the sixth portion 2483 of each second locking portion 248 is pressed against the first surface portion 2721 of the second locked portion 272, causing the second locking portion 248 to bend (elastically deform), and the rod body 23A continues to move toward the tip in the X-axis direction. At this time, the second locking portion 248 bends so that the end of the sixth portion 2483 on the base end in the X-axis direction approaches the fifth portion 2482 (see enlarged view of Figure 46A).

[0161] Then, when the operating part 31A is rotated to the end position P2 and the rod pushing part 26A moves to the end position P12 while remaining in the first state (see Figure 47C), the sixth portion 2483 of each second locking part 248 passes over the second locked part 272 in the X-axis direction, and the bent second locking part 248 returns to its original position, so that the base end of the sixth portion 2483 in the X-axis direction faces the third surface portion 2723 of the second locked part 272 in the X-axis direction (see Figures 47A and 47B). In this way, the rod body part 23 (shaft body part 241) is pushed against the barrel 21 to the first push-in position (predetermined push-in position) P21.

[0162] In this way, as the rod body 23A is pushed into the barrel 21 to the first push-in position P21, a portion (about half) of the contents (liquid) filled in the barrel 21 is ejected from the spray nozzle N. During the pushing of the rod body 23A into the barrel 21A during this ejection, the first pressure accumulating rib 245a passes through the hole 274a of the pressure accumulating wall 274 of the barrel holding part 27. However, since the inner diameter of the hole 27a is slightly smaller than the outer diameter of the part of the rod body 23A where the first pressure accumulating rib 245a is formed, the rod body 23A is accelerated as the first pressure accumulating rib 245a passes through the hole 274a of the pressure accumulating wall 274, and the contents (liquid) are suitably sprayed from the spray nozzle N.

[0163] After the first injection of the contents (liquid), the rod pushing section 26A has moved to its final position P12. As a result, the distance in the X-axis direction between the end face 261Aa of the rod pushing section body 261A and the biasing member locking section 275 of the barrel holding section 27 is reduced, causing the biasing member S to be compressed in the X-axis direction (see Figure 47C).

[0164] In this state, when the user releases the force α in the intersecting direction on the operating part 31A (a force pushing the operating part 31A towards the operating mechanism body 32), the biasing member S pushes the rod pushing part 26A toward the base end in the X-axis direction by elastic force, causing the rod pushing part 26A to move toward the base end in the X-axis direction (i.e., it moves from the end point of movement P12 toward the start point of movement P11).

[0165] When the rod pushing portion 26A moves, the rod body portion 23A does not move toward the base end in the X-axis direction (i.e., it maintains its position) because the second locking portion 248 is locked to the second locked portion 272, while the rod pushing portion 26A moves toward the base end in the X-axis direction (see Figures 47A to 49C).

[0166] At this time, as the rod pushing portion 26A moves, each second state engaging portion 2615 protruding from the opening peripheral portion 2614a of the second cylindrical portion 2612 pushes the projection 2444 (specifically, the inclined surface portion 2444a) of the second state engaged portion 244A of the rod body portion 23A, causing the second state engaged portion 244A (flexible portion 2443) to bend (elastically deform) (see Figures 48A and 48B), and the rod pushing portion 26A continues to move toward the base end in the X-axis direction.

[0167] Furthermore, when the rod pushing portion 26A moves from the end position P12 towards the start position P11 (i.e., moves towards the base end in the X-axis direction), each pushed portion 262A of the rod pushing portion 26A pushes the pushing portion 313A of the operating portion 31A, causing the operating portion 31A to rotate from the end position P2 towards the start position P1 (see Figures 57C and 49C).

[0168] Then, when the operating part 31A rotates to the starting position P1 (see Figure 49C), that is, when the rod pushing part 26A moves to the starting position P11, each second state engaging part 2615 passes over the projection 2444 of the second state engaged part 244A in the X-axis direction. As a result, the bent second state engaged part 244A (bent part 2443) returns to its original position, and each projection 2444 faces the second state engaging part 2615 in the X-axis direction (see Figures 49A and 49B).

[0169] In the injection device 1A of this embodiment, after the first injection of the contents (drug solution), when the operating unit 31A returns from the operation end position P2 to the operation start position P1, that is, when the rod pushing unit 26A returns from the movement end position P12 to the movement start position P11, each second state engaging portion 2615 of the rod pushing unit 26A comes into contact with (engages with) the projection 2444 of the second state engaged portion 244A of the rod body 23A in the X-axis direction. That is, the rod pushing unit 26A enters the second state (see Figure 49A).

[0170] Next, the user inserts the spray nozzle N into the nostril opposite to the one from which the first contents (liquid medicine) were sprayed, and in this state, pushes (rotates) the operating unit 31A in a direction α perpendicular to the operating mechanism body 32A. This rotation of the operating unit 31A causes each of the pushing parts 313A of the operating unit 31A to push the pushed parts 262A of the rod pushing unit 26A, causing the rod pushing unit 26A to move from the starting position P11 to the ending position P12.

[0171] As the rod pushing portion 26A moves toward the tip in the X-axis direction, each second state engaging portion 2615 of the rod pushing portion 26A pushes each second state engaged portion 244A (each projection 2444) of the rod body portion 23A toward the tip in the X-axis direction, so the rod body portion 23A also moves toward the tip in the X-axis direction together with the rod pushing portion 26A. That is, the rod body portion 23A (shaft body 241A) is pushed further into the barrel 21 from the first pushing position P21 (see Figures 49A to 50C).

[0172] Then, when the operating section 31A is rotated to the end position P2 and the rod pushing section 26A moves to the end position P12 while remaining in the second state, the rod body 23A (shaft body 241A) is pushed against the barrel 21 to the second pushing position P22. The second pushing position P22 is a position closer to the tip in the X-axis direction than the first pushing position P21.

[0173] In this way, as the rod body 23A is pushed into the barrel 21 to the second push-in position P22, the remaining contents (liquid) that were filled in the barrel 21 (about half) are ejected from the spray nozzle N. That is, a second injection of the contents (liquid) takes place. During the pushing of the rod body 23A into the barrel 21 for this injection, the second pressure accumulating rib 245b passes through the hole 274a of the pressure accumulating wall 274 in the barrel holding part 27. However, since the inner diameter of the hole 274a is slightly smaller than the outer diameter of the part of the rod body 23A where the second pressure accumulating rib 245b is formed, the rod body 23A is accelerated as the second pressure accumulating rib 245b passes through the hole 274a of the pressure accumulating wall 274, and the contents (liquid) are suitably sprayed from the spray nozzle N.

[0174] The injection device 1A described above comprises a syringe 2A having a tip portion 21a and a base portion 21b in the X-axis direction (axial direction), a barrel 21 from which contents can be discharged from the tip portion 21a, and a rod 22A that is inserted into the barrel 21 from the base end and can be pushed toward the tip, and an operating mechanism 3A for pushing the rod 22A. The rod 22A includes a pressed portion 262A, and the operating mechanism 3A comprises an operating section 31A having a pushing portion 313A that pushes the pressed portion 262A toward the tip in the X-axis direction, and the operating section 31A is configured to be operable in an intersecting direction α that intersects with the X-axis direction, and when the operating section 31A is operated in the intersecting direction α, the pushing portion 313A pushes the pressed portion 262A toward the tip, and the rod 22A is pushed toward the tip.

[0175] With this configuration, the rod 22A can be pushed toward the tip side along the X-axis direction relative to the barrel 21 by operating the operating part 31A in the intersecting direction α. ​​Therefore, when pushing the rod 22A, the position of the tip 21a of the barrel 21 is less likely to shift and is easier to maintain.

[0176] Furthermore, in the injection device 1A of this embodiment, the operating section 31A is arranged in parallel with the rod 22A before it is pushed in, in a radial direction perpendicular to the X-axis direction (axial direction). By arranging the operating section 31A and the rod 22A before it is pushed in parallel in a radial direction perpendicular to the X-axis direction in this way, the operating section 31A is easy to operate.

[0177] Furthermore, the injection device 1A of this embodiment includes a barrel position restricting section 4A that restricts the position of the barrel 21. The barrel position restricting section 4A includes an axial restricting section 41A (clamping section 273) that restricts the movement of the barrel 21 at least toward the tip in the X-axis direction (axial direction), and a radial restricting section 42A that restricts the radial position of the barrel 21. The radial restricting section 42A is positioned toward the tip side relative to the axial restricting section 41A, and the pushing section 313A is positioned toward the base end side relative to the axial restricting section 41A.

[0178] Thus, a radial restricting portion 42A that restricts the radial position of the barrel 21 is positioned at the tip of the axial restricting portion 41A that restricts the movement of the barrel 21 at least toward the tip in the X-axis direction, and a pushing portion 313A is positioned at the base end of the axial restricting portion 41A in the X-axis direction. This makes it easier to maintain the position of the syringe 2A relative to the operating mechanism portion 3A when operating the operating portion 31A to push in the rod 22A.

[0179] Furthermore, in the injection device 1A of this embodiment, the operating section 31A is configured to be rotatable in the intersecting direction α by a rotational operation, and comprises a pivot shaft portion 311A ​​which serves as the pivot center in the rotational operation, an operating body portion 312 extending in the X-axis direction from the pivot shaft portion 311A, and a pushing portion 313A extending in the intersecting direction α from the operating body portion 312.

[0180] With this configuration, when the operating part 31A is operated, the pushing part 313A, which rotates in the intersecting direction α at a position away from the pivot shaft part 311A, can push the rod 22A toward the tip in the X-axis direction. Therefore, due to the lever principle, the rod 22A can be smoothly pushed in even with a small force. Further details are as follows.

[0181] In the operating section 31A, the operating body 312 extends from the pivot shaft 311A, and the pushing section 313A extends from the operating body 312 in the intersecting direction α. ​​Therefore, the pushing section 313A is positioned at a distance in the X-axis direction from the pivot shaft 311A ​​by the amount that the operating body 312 extends. At this distance, it rotates in the intersecting direction α by a rotational operation, pushing the pressed portion 262A of the rod 22A toward the axial end. This allows the rod 22A to be pushed using the lever principle, and the rod 22A can be smoothly pushed in with little force.

[0182] Furthermore, the injection device 1A of this embodiment is equipped with a biasing member S, and the rod 22A comprises a rod body portion 23A that is inserted into the barrel 21 from the base end side and can be pushed toward the tip side, and a rod pushing portion 26A equipped with a pushed portion 262A. The rod pushing portion 26A is configured to be changeable from a first state (see Figure 46A) in which it is locked to the rod body portion 23A at a predetermined position in the X-axis direction (axial direction), to a second state (see Figure 49A) in which it is locked to the rod body portion 23A at a position toward the base end in the X-axis direction from the predetermined position, and the syringe 2A is configured to perform administration (see Figure 47A) in which the rod body portion 23A is pushed toward the barrel 21 to a first pushing position (predetermined pushing position) P21 when the rod pushing portion 26A is in the first state, and the rod pushing portion 26 After A changes from the first state to the second state, the rod body 23A is further pushed against the barrel 21 from the first push position P21 (see Figure 50A), thereby enabling the contents to be administered in portions. When the operating part 31A is operated in the intersecting direction α from the operation start position P1, the pressed part 262A is pushed by the pushing part 313A, causing the rod pushing part 26A to move from the movement start position P11, which is the starting point of the movement of the rod pushing part 26A, towards the tip in the X-axis direction. The biasing member S then biases the rod pushing part 26A to return from the destination to the movement start position P11 after administration in the first state, and also biases the operating part 31A to return from the operation end position (position after operation) P2 to the operation start position P1. As the rod pushing part 26A returns to the movement start position P11 due to the biasing, it changes from the first state to the second state, enabling administration in the second state in syringe 2A.

[0183] With this configuration, the contents of syringe 2A can be divided and administered by repeating the same operation on the operating unit 31A. Specifically, when the rod pushing unit 26A moves from the first state to the second state, the biasing force of the biasing member S causes the rod pushing unit 26A to return to the starting position P11 and the operating unit 31A to return to the starting position P1. As a result, after the contents of syringe 2A are administered by operating the operating unit 31A when the rod pushing unit 26A is in the first state, the biasing force of the biasing member S causes the rod pushing unit 26 to return to the starting position P11 and the operating unit 31A to return to the starting position P1, and the rod pushing unit 26A enters the second state. This makes administration in the second state possible with syringe 2A, and as a result, the contents of syringe 2A can be divided and administered by repeating the same operation.

[0184] Furthermore, the injection device of the present invention is not limited to the first and second embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and a part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, a part of the configuration of one embodiment can be deleted.

[0185] The contents sprayed by the injection devices 1 and 1A in the first and second embodiments described above are drug solutions, but the configuration is not limited to this. The contents sprayed by the injection devices 1 and 1A may be liquids other than drug solutions, or they may be powders, etc.

[0186] Furthermore, while the injection devices 1 and 1A of the first and second embodiments described above inject the contents into the nasal cavity, they are not limited to this configuration. The injection devices 1 and 1A may also be configured to inject the contents into the oral cavity.

[0187] Furthermore, in the injection devices 1 and 1A of the first and second embodiments described above, the operating parts 31 and 31A are operated in the intersecting direction α by a rotational operation with the pivot shafts 311 and 311A ​​as the center of rotation, but the configuration is not limited to this. The operating parts 31 and 31A may be configured to be operated in a direction intersecting the central axis C (intersecting direction) by sliding or the like.

[0188] Furthermore, in the injection devices 1 and 1A of the first and second embodiments described above, even in this case, the operating parts 31 and 31A are arranged side by side in the radial direction perpendicular to the central axis C direction with respect to the rods 22 and 22A before they are pushed into the barrel 21, but the configuration is not limited to this. The operating parts 31 and 31A may be positioned offset towards the front or rear end in the X-axis direction with respect to the rods 22 and 22A before they are pushed into the barrel 21.

[0189] Furthermore, although the injection devices 1 and 1A of the first and second embodiments described above are equipped with barrel position restrictors 4 and 4A, the device is not limited to this configuration. The injection devices 1 and 1A do not need to be equipped with barrel position restrictors 4 and 4A. Also, the injection devices 1 and 1A may be configured to be equipped with only one of the axial restrictors 41 and 41A or the radial restrictors 42 and 42A. In addition, in the injection devices 1 and 1A, the radial restrictors 42 and 42A may be positioned closer to the base end in the direction of the central axis C than the axial restrictors 41 and 41A, or they may be positioned at the same position as the axial restrictors 41 and 41A in the direction of the central axis C.

[0190] Furthermore, while the axial restricting portions 41 and 41A of the injection devices 1 and 1A in the first and second embodiments described above restrict the movement of the barrel 21 toward the tip and toward the base in the X-axis direction, the configuration is not limited to this. The axial restricting portions 41 and 41A only need to be configured to restrict the movement of the barrel 21 toward the tip in the X-axis direction.

[0191] Furthermore, in the injection devices 1 and 1A of the first and second embodiments described above, the rods 22 and 22A are composed of two members (rod body portions 23 and 23A and rod pushing portions 26 and 26A) aligned in the direction of the central axis C, but the configuration is not limited to this. The rods 22 and 22A may be composed of a single part or member, or they may be composed of three or more parts or members aligned in the direction of the central axis C (X-axis direction).

[0192] Furthermore, in the injection devices 1 and 1A of the first and second embodiments described above, the number of pressing parts 313 and 313A of the operating parts 31 and 31A and the number of pressed parts 262 and 262A of the rods 22 and 22A are one or two, but may be three or more.

[0193] Furthermore, in the injection devices 1 and 1A of the first and second embodiments described above, the operating sections 31 and 31A are equipped with pivot shaft sections 311 and 311A, but the device is not limited to this configuration. The pivot shaft sections 311 and 311A ​​may be provided by the operating mechanism body 32 and 32A, or they may be configured independently of the operating sections 31 and 31A and the operating mechanism body 32 and 32A.

[0194] Furthermore, in the injection devices 1 and 1A of the first and second embodiments described above, the biasing force of the biasing member S returns the operating units 31 and 31A from the end position P2 to the start position P1, but the configuration is not limited to this. The user may manually return the operating units 31 and 31A from the end position P2 to the start position P1. In other words, the injection devices 1 and 1A may be configured without the biasing member S.

[0195] Furthermore, while the biasing member S in the first and second embodiments described above is a coil spring, the configuration is not limited to this. The biasing member S may be other spring members such as leaf springs, or elastic members such as rubber. Also, the material of the biasing member S is not limited to metal, but may be resin. That is, the biasing member S may be a resin spring or the like.

[0196] Furthermore, while the injection devices 1 and 1A of the first and second embodiments described above are configured to inject the contents filled in the barrel 21 from the injection nozzle N, the device is not limited to this configuration. The injection devices 1 and 1A may also be configured to discharge the contents filled in the barrel 21 from the discharge portion 212 of the barrel 21, etc. That is, the injection devices 1 and 1A may be configured not to have an injection nozzle N at the tip portion 21a (discharge portion 212) of the barrel 21, etc. [Explanation of Symbols]

[0197] 1, 1A... Injection device, 2, 2A... Syringe, 21... Barrel, 21a... Tip part, 21b... Base end part, 211... Barrel body, 212... Discharge part, 213... Flange part, 22, 22A... Rod, 23, 23A... Rod body part, 24, 24A... Shaft part, 241, 241A... Shaft body, 241a... Planar part, 2410, 2410A...main body base end, 242...first locking part, 2421...first part, 2422...second part, 2423...third part, 2424...fourth part, 243...first state engaged part, 243A...first state engaged part, 244...second state engaged part, 244A...second state engaged part, 2441... Inclined surface portion, 2442... Pressed surface portion, 2443... Flexible portion, 2444... Projection portion, 2444a... Inclined surface portion, 2445... Plate-shaped portion, 245... Pressure accumulation rib, 245a... First pressure accumulation rib, 245b... Second pressure accumulation rib, 246... First protrusion portion, 246a... One first protrusion portion, 246b... The other first protrusion portion, 247... Extending portion, 248... Second locking portion, 2481... Fourth portion, 2482... Fifth portion, 2483... Sixth portion, 2484... Third protrusion portion, 25... Piston, 26, 26A... Rod pushing portion, 261, 261A... Rod pushing portion body, 261Aa... End face, 2611... First cylindrical portion, 26 11a...Inner circumferential surface, 2611b...Third guide groove, 2612...Second cylindrical portion, 2613...First state engaging portion, 2614...Opening, 2614a...Peripheral edge of opening, 2615...Second state engaging portion, 262, 262A...Pushed portion, 262a, 2621...Contact portion, 2621a...End face, 2621b...Fourth protrusion, 263...First state engaging portion, 264...Second state engaging portion, 2641...Engaging shaft portion, 2642...Contact portion, 2643...Pushing surface portion, 265...First locking projection, 266...Second protrusion, 27...Barrel holding portion, 271...Holding portion body, 271a...Outer surface, 272...Second locked portion, 2721...First surface portion, 2 722...Second surface part, 2723...Third surface part, 273...Pinching part, 274...Pressure accumulation wall part, 274a...Hole part, 275...Biasing member locking part, 2751...Engagement Stop plate part, 2752...notch part, 2753...locking convex part, 3, 3A...operation mechanism part, 31, 31A...operation part, 311, 311A...rotation shaft part, 312 ...Operation body part, 313, 313A...Pushing part, 313a...Edge, 314, 314A...Rotation regulating part, 32, 32A...Operating mechanism part main body, 3201, 3202, 3201A, 3202A...Divided member, 3201a, 3202a, 3201Aa, 3202Aa...Opposing surface, 321...Rotation shaft holding part,322...First guide groove, 323...Second guide groove, 324...First locking part, 3241...Inclined surface part, 3242...Locking surface part, 325...Second locking projection, 326...Pressure accumulation wall part, 326a...Hole part, 327...Fourth guide groove, 4...Barrel position regulating part, 4A...Barrel position regulating part, 41, 41A...Axial regulating part, 42, 42A...Radial regulating part, 901...Syringe, 910...Outer cylinder, 912...Main body, 913...Mouth part, 914...Flange, 920...Plunger, C...Central axis, N...Injection nozzle, P1...Operation start position, P2...Operation end position, P11...Movement start position, P12...Movement end position, P21...First push-in position, P22...Second push-in position, S...Biasing member, α...Intersecting direction, β...Spacing,

Claims

1. A syringe having an axial tip and a base, a barrel from which contents can be discharged from the tip, and a rod that is inserted into the barrel from the base and can be pushed towards the tip, It comprises an operating mechanism for pushing in the aforementioned rod, The rod includes the portion to be pressed, The operating mechanism includes an operating section having a pressing section that pushes the pressed section toward the tip in the axial direction, The operating unit is configured to be operable in a direction that intersects the axial direction, An injection device wherein, when the operating part is operated in the aforementioned intersecting direction, the pressing part pushes the part to be pressed toward the tip, and the rod is pushed toward the tip.

2. The injection device according to claim 1, wherein the operating section is arranged in parallel with the rod before it is pushed in, in a radial direction perpendicular to the axial direction.

3. The barrel position regulating unit is provided to regulate the position of the barrel, The barrel position restricting unit comprises an axial restricting unit that restricts the movement of the barrel at least toward the tip in the axial direction, and a radial restricting unit that restricts the radial position of the barrel. The radial restricting portion is positioned towards the tip side relative to the axial restricting portion. The injection device according to claim 1 or claim 2, wherein the pressing portion is positioned on the proximal end side with respect to the axial restricting portion.

4. The injection device according to claim 1 or 2, wherein the operating section is configured to be rotatable in the intersecting direction by a rotational operation, and comprises a pivot shaft portion that serves as the pivot center in the rotational operation, an operating body portion extending in the axial direction from the pivot shaft portion, and a pressing portion extending in the intersecting direction from the operating body portion.

5. Equipped with a biasing member, The rod comprises a rod body portion that is inserted into the barrel from the base end and can be pushed toward the tip end, and a rod pushing portion having the portion to be pushed. The rod pushing portion is configured to be changeable from a first state in which it engages with the rod body at a predetermined position in the axial direction, to a second state in which it engages with the rod body at a position closer to the base end in the axial direction than the predetermined position. The syringe is capable of dispensing its contents in two ways: an administration in which the rod body is pushed to a predetermined indentation position relative to the barrel when the rod pushing portion is in the first state, and an administration in which the rod body is pushed further into the barrel from the predetermined indentation position after the rod pushing portion has changed from the first state to the second state. When the operating part is operated in the intersecting direction from the starting position of the operation, the pressed part is pressed by the pressing part, causing the rod pressing part to move from the starting position of the movement, which is the starting point of the movement of the rod pressing part, toward the tip in the axial direction. The biasing member biases the rod pushing portion to return from the destination to the starting position after administration in the first state, and the operating portion to return from the position after operation to the starting position. The injection device according to claim 1 or 2, wherein when the rod pushing portion returns to the starting position of movement due to the biasing force, it changes from the first state to the second state, thereby enabling administration in the second state using the syringe.

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