assistive devices

Abstract

This syringe aid helps to maintain the position of the barrel tip by assisting in pushing the rod in. [Solution] Applicable to a syringe 2 having an axial tip portion 200 and a base portion, a barrel 20 from which contents can be discharged from the tip portion, and a rod 21 inserted into the barrel from the base end side and pushed toward the tip side, the device comprises a holding portion 400 for holding the barrel, a pushing portion that is movable toward the tip side in the axial direction to push the rod toward the tip side, and an operating portion for moving the pushing portion toward the tip side in the axial direction, wherein the operating portion is operated in a crossing direction intersecting the axial direction to move the pushing portion toward the tip side.

Description

Technical Field

[0001] The present invention relates to an auxiliary tool applied to a syringe capable of administering a liquid medicine filled inside into a nostril or oral cavity.

Background Art

[0002] Conventionally, syringes for administering liquids and the like are known (Patent Document 1). As shown in Figure 5, the syringe 901 includes an outer cylinder 910 and a plunger 920 inserted into the outer cylinder 910. The outer cylinder 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 rest. A needle hub or the like is attached to the mouth portion 913. In this syringe 901, the liquid is administered by pushing the plunger 920 from the other end side to the one end side with respect to the outer cylinder 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 plunger 920 is pushed and operated along the direction in which the needle is inserted and the direction in which the liquid is discharged from the outer cylinder 910, there is a risk that the position of the distal end portion of the outer cylinder 910 during liquid administration, 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. In particular, when a user performs self-administration, the position of the mouth portion 913 in the syringe 901 may shift in the direction of needle insertion, the discharge direction, and the like.

[0005] The present invention aims to provide an auxiliary tool for syringes that makes it easier to maintain the position of the barrel tip by assisting in pushing in the rod. [Means for solving the problem]

[0006] The auxiliary tool of the present invention is applied to a syringe having an axial tip and a base end, a barrel from which contents can be discharged from the tip, and a rod inserted into the barrel from the base end and pushed toward the tip, and comprises a holding part for holding the barrel, a pushing part that is movable toward the tip in the axial direction to push the rod toward the tip, and an operating part for moving the pushing part toward the tip in the axial direction, wherein the operating part is operated in a crossing direction intersecting the axial direction to move the pushing part toward the tip.

[0007] With this configuration, when the operating part of the auxiliary tool is operated in a direction that intersects the axial direction, the pushing part that moves toward the tip pushes the rod toward the tip. Thus, the pushing toward the tip along the axial direction of the rod can be assisted by operating the operating part in a direction that intersects the axial direction. Therefore, when pushing the rod, the position of the tip of the barrel is less likely to shift and is easier to hold.

[0008] Furthermore, in the auxiliary device, the operating portion may be arranged in parallel with the rod before it is pushed in, in a radial direction perpendicular to the axial direction.

[0009] With this configuration, the operating part and the rod before it is pushed are arranged side by side in the radial direction perpendicular to the axial direction, making it easy to operate the operating part.

[0010] Furthermore, the holding portion of the auxiliary tool comprises an axial holding portion that holds the barrel at least towards the tip in the axial direction, and a radial holding portion that holds the barrel at a radial position in the axial direction, and the pushing portion includes a pressing portion that contacts the rod in order to push the rod, the radial holding portion may be positioned towards the tip in the axial direction relative to the axial holding portion, and the pressing portion may be positioned towards the base end relative to the axial holding portion.

[0011] With this configuration, a radial holding part that holds the barrel's radial position is positioned at the tip of the axial holding part that holds the barrel's axial position towards the tip, and a pressing part of the auxiliary tool that contacts the rod is positioned at the base end of the axial holding part. Therefore, when operating the operating part to push the rod in, the position of the syringe relative to the auxiliary tool is easily maintained.

[0012] Furthermore, the auxiliary device includes a rod-side member attached to the rod and configured to switch between a first state in which the syringe is locked to the rod at a predetermined position in the axial direction and a second state in which the syringe is locked to the rod at a position closer to the base end in the axial direction than the predetermined position and a biasing member that engages with the rod and the rod-side member and biases the rod-side member to change from the first state to the second state, wherein when the rod-side member is in the first state, the rod is pushed to a predetermined indentation position relative to the barrel, and after the rod-side member changes from the first state to the second state due to the biasing of the biasing member, the rod is pushed further into the barrel from the predetermined indentation position The device is configured to administer the contents in portions, and the operating part is operated from the starting position of the operation to one side in the intersecting direction, thereby causing the pushing part to move from the starting position of the movement to the tip side in the axial direction, and the pushing part, due to the biasing of the biasing member when the rod-side member changes from the first state to the second state, moves from the destination to which it moved during administration in the first state to the base end side in the axial direction and returns to the starting position of the movement, and the operating part, due to the biasing of the biasing member when the rod-side member changes from the first state to the second state, moves from the position after the operation performed during administration in the first state to the other side in the intersecting direction and returns to the starting position of the operation.

[0013] With this configuration, the biasing force of the biasing member when the rod-side member moves from the first state to the second state causes the pushing part to return to the starting position and the operating part to return to the starting position. Therefore, after dispensing in the first state by operating the operating part, the rod-side member returns to the starting position and the operating part returns to the starting position, allowing dispensing in the second state to be performed by operating the operating part. Thus, the contents can be divided and dispensed by repeating the same operation. [Effects of the Invention]

[0014] Based on the above, the present invention provides an auxiliary tool for syringes that makes it easier to maintain the position of the barrel tip by assisting in pushing in the rod. [Brief explanation of the drawing]

[0015] [Figure 1A] Figure 1A is a front view of a syringe in its first state with the auxiliary device according to the present invention attached. [Figure 1B] Figure 1B is a cross-sectional view of the syringe with the auxiliary device attached, taken at the front position before the first dose. [Figure 1C] Figure 1C is a cross-sectional view of the IC-IC position in Figure 1A. [Figure 1D] Figure 1D is a front view showing the auxiliary device removed from the syringe. [Figure 1E] Figure 1E is an exploded perspective view of the syringe and the auxiliary device. [Figure 2] Figure 2 is a cross-sectional view of the syringe at the front position during the first administration of the drug using the syringe with the auxiliary device attached. [Figure 3] Figure 3 is a cross-sectional view of the syringe with the auxiliary device attached, taken at the front position before the second dose. [Figure 4] Figure 4 is a cross-sectional view of the syringe at the front position during the second administration of the substance using the syringe with the auxiliary device attached. [Figure 5] Figure 5 is a perspective view of a conventional syringe. MODES FOR CARRYING OUT THE INVENTION

[0016] An assisting device according to a first embodiment of the present invention will be described with reference to FIGS. 1A to 4. As shown in FIG. 1A, the assisting device 1 is applied to a syringe 2 that divides and administers contents. In the present embodiment, the assisting device 1 is reusable for a plurality of syringes 2, and the syringes 2 are disposable. Further, the assisting device 1 is sold separately from the syringes 2. The assisting device 1 may be sold as a set with the syringe 2.

[0017] The assisting device 1 is applied to a syringe 2 that divides and administers contents in two doses. The assisting device 1 may be applied to a syringe that divides and administers contents in three or more multiple doses.

[0018] Hereinafter, the syringe 2 which is the application target of the assisting device 1 will first be described, and then the assisting device 1 will be described. The syringe 2 is a nasal administration container capable of dividing and administering a mist-like drug solution into both nostrils. The drug solution is a liquid drug solution, for example, an influenza vaccine. The syringe 2 has a substantially cylindrical shape.

[0019] The syringe 2 has an axial distal end portion 200 and a proximal end portion 201, and includes a barrel 20 capable of discharging contents from the distal end portion 200, and a rod 21 inserted into the barrel 20 from the proximal end side and capable of being pushed toward the distal end side. The syringe 2 further includes a pushing mechanism 22 capable of pushing the rod 21 toward the distal end side. Furthermore, the syringe 2 includes a barrel-side member 23 attached to the barrel 20. The syringe 2 includes an injection nozzle 24 provided at the distal end portion 200 of the barrel 20.

[0020] In the syringe 2, the side where the distal end portion 200 of the barrel 20 is arranged, that is, the upper side in FIGS. 1A, 1B, 1D to 4 is the "distal end side", and the side where the proximal end portion 201 of the barrel 20 is arranged, that is, the lower side in FIGS. 1A, 1B, 1D to 4 is the "proximal end side". The "axial direction" of the syringe 2 is the cylinder axial direction of the syringe 2. Further, the radial direction of the syringe 2 is also simply referred to as the "radial direction".

[0021] Syringe 2 is administered for the first time by pushing the rod 21 towards the tip, starting from a position where the rod 21 is lowered towards the proximal end (see Figures 1A and 1B) (see Figure 2). Next, syringe 2 is administered for the second time by pushing the rod 21 further towards the tip, after the rod 21 has been lowered even further towards the proximal end than the position shown in Figure 1A (see Figure 3) (see Figure 4).

[0022] The barrel 20 is a component that contains the liquid chemical inside (see Figure 1A). In this embodiment, the barrel 20 comprises a barrel body 202 and a flange portion 203 provided on the barrel body 202.

[0023] Furthermore, the barrel 20 is made of a material that is transparent and can withstand the internal pressure applied when dispensing the drug solution. Specifically, the material of the barrel 20 is a resin or glass containing cyclic olefins such as norbornene as repeating units.

[0024] The barrel body 202 is a cylindrical part. In this barrel 20, the tip of the barrel body 202 constitutes the tip portion 200 of the barrel 20, and the base portion of the barrel body 202 constitutes the base portion 201 of the barrel 20.

[0025] The flange portion 203 extends outward from, for example, the entire circumference of one end of the base end portion 201 in the direction of the cylinder axis, i.e., radially outward from the barrel body 202. In this embodiment, the flange portion 203 is annular when viewed from the direction of the cylinder axis, for example, it is circular.

[0026] The outer diameter of the tip portion 200 of the barrel 20 is smaller than the outer diameter of the other parts of the barrel 20. The outer diameter of the parts of the barrel 20 other than the tip portion 200 and the flange portion 203 is uniform.

[0027] The rod 21 is a component that moves together with the rod-side member 25 when discharging the contents from the barrel 20. The rod 21 also has an axial shape. The material of the rod 21 is a resin such as POM (polyacetal).

[0028] In this embodiment, the rod 21 comprises a rod body 210 and a member attachment portion 211 provided on the rod body 210 (see Figure 1E). The rod 21 also includes a piston 212 provided on the rod body 210. In this rod 21, the member attachment portion 211 is provided at the base end of the rod body 210, and the piston 212 is provided at the tip end of the rod body 210. The rod 21 is inserted into the barrel 20 in a position where the member attachment portion 211 is located on the base end side and the piston 212 is located on the tip side. A rod-side member 25 is attached to the member attachment portion 211.

[0029] The piston 212 is a component that can abut against the inner surface located on the base end side of the tip portion 200 of the barrel 20. The piston 212 also makes close contact with the entire inner circumference of the barrel body 202 of the barrel 20. In this embodiment, the tip surface of the piston 212 abuts against the inner surface of the tip portion 200 of the barrel 20 when the discharge of the chemical solution from the barrel 20 is complete, specifically during the second discharge of the chemical solution as shown in Figure 4.

[0030] The push-in mechanism 22 is operated by the auxiliary tool 1. The push-in mechanism 22 also includes a rod-side member 25 attached to the rod 21 and a biasing member 26 (see Figure 1E).

[0031] The push mechanism 22 can be in two states: a non-discharge state in which no axial force is applied to the rod 21 and no contents are discharged from the barrel 20 (see Figures 1B and 3), and a discharge state in which the contents are discharged from the barrel 20 by pushing the rod 21 toward the tip (see Figures 2 and 4). In this embodiment, the push mechanism 22 in the non-discharge state is operated by the auxiliary tool 1 to transition to the discharge state. Furthermore, the push mechanism 22 in the discharge state has spring properties, and once the discharge of contents from the barrel 20 is complete, the push mechanism 22 returns to the non-discharge state due to its restoring force.

[0032] The rod-side member 25 is operated by the auxiliary tool 1 to move axially toward the tip, thereby moving the rod 21 toward the tip and discharging the contents of the barrel 20. In this embodiment, the rod-side member 25 is configured to switch between a first state in which it is locked to the rod 21 at a predetermined axial position (see Figure 1B) and a second state in which it is located axially toward the base end of the rod 21 (see Figure 3). That is, in the second state, the rod-side member 25 is locked to the rod 21 at a position axially toward the base end of the predetermined position. The second state is a state in which the rod-side member 25 is locked to the rod 21 at a second locking position, which is a position toward the base end of the predetermined position. Thus, both the first locking position and the second locking position are positions in which the rod-side member 25 is locked to the rod 21. When the rod-side member 25 is in the first state, it moves to the second state by the biasing force of the biasing member 26 (see Figure 3).

[0033] Furthermore, the rod-side member 25 is provided with a pressed portion 250 that is pressed by the pressing portion 5 of the auxiliary tool 1, which will be described later. Specifically, the rod-side member 25 is cylindrical with a closed opening at the base end, for example, it is substantially cylindrical. In this embodiment, the rod-side member 25 is provided with a top plate portion 251 and a skirt portion 252 that extends from the top plate portion 251 toward the tip.

[0034] The pressed portion 250 is the part that returns to its original position when pressed by the pressing portion 5 after the first administration of the contents, in order to administer the contents a second time. The pressed portion 250 is also provided at the base end of the rod-side member 25. In this embodiment, the pressed portion 250 is composed of the top plate portion 251, but it may be composed of a part other than the top plate portion 251.

[0035] The top plate portion 251 is a flat plate oriented radially, specifically a disc shape. Furthermore, when discharging the contents from the barrel 20, the top plate portion 251 is operated by the auxiliary tool 1, specifically pressed toward the tip by the auxiliary tool 1. The outer circumference portion 253 of the top plate portion 251 is rounded (R-shaped), but it may also be rounded (C-shaped).

[0036] The skirt portion 252 extends from the outer peripheral portion 253 of the top plate portion 251 toward the tip. The skirt portion 252 is continuous along the entire outer circumference of the top plate portion 251 and is, for example, cylindrical. The skirt portion 252 is provided with a slit that extends axially from the tip edge to just before the base end.

[0037] The biasing member 26 engages with the rod 21 and the rod-side member 25, biasing the rod-side member 25 to change from the first state to the second state (see Figure 1E). In this embodiment, the biasing member 26 is an elastic member that is positioned inside the rod-side member 25, together with the member mounting portion 211 which is the base end of the rod 21, and is in contact with the member mounting portion 211 from the base end side.

[0038] The biasing member 26 is a spring, specifically a metal spring. Furthermore, the biasing member 26 is a compression spring. Note that the biasing member 26 may be a material other than a metal spring, such as a resin spring. If the syringe 2 is equipped with a resin spring as the biasing member 26, the resin spring and the rod 21 may be integrated. Also, if the syringe 2 is equipped with a resin spring as the biasing member 26, the resin spring as the biasing member 26 and the rod-side member 25 may be integrated.

[0039] The biasing member 26 is positioned between the top plate portion 251 of the rod-side member 25 and the member mounting portion 211 of the rod 21. The biasing member 26 engages with the top plate portion 251 and the member mounting portion 211, biasing the rod-side member 25 to move toward the base end, thereby moving the rod-side member 25 from the first state to the second state.

[0040] The barrel-side member 23 is attached to the barrel 20 by fitting it onto the flange portion 203 of the barrel 20. The barrel-side member 23 comprises a cylindrical barrel-side body 230, a barrel mounting portion 231 which fits onto the flange portion 203 of the barrel 20, and a barrel-side flange portion 232 which extends radially outward from the barrel mounting portion 231. The material of the barrel-side member 23 is a resin such as PP (polypropylene).

[0041] The barrel-side body 230 is located on the base end side of the barrel 20 and covers the base end of the barrel 20 from the outside. The barrel-side body 230 is, for example, cylindrical. The outer diameter of the barrel-side body 230 is approximately uniform, but may be non-uniform, for example, tapered, becoming narrower towards the tip in the axial direction.

[0042] The barrel mounting portion 231 is located on the tip side of the barrel-side member 23 and extends from the barrel-side body 230 toward the tip. The barrel mounting portion 231 is also formed in a wall shape. In this embodiment, the barrel mounting portion 231 is provided with through holes 233 that penetrate radially. A pair of through holes 233 are provided in this barrel mounting portion 231. A part of the flange portion 203 of the barrel 20 is exposed through these through holes 233.

[0043] The barrel-side flange portion 232 extends outward from the barrel mounting portion 231. Furthermore, a pair of barrel-side flange portions 232 are provided, for example, on either side of the barrel 20. These barrel-side flange portions 232 are positioned to avoid the through-hole 233 of the barrel mounting portion 231.

[0044] The spray nozzle 24 is the part that dispenses the contents. The spray nozzle 24 in this embodiment is configured to dispense the liquid medicine in a mist form.

[0045] The syringe 2 described above is configured to dispense the contents in two ways: when the rod-side member 25 is in the first state, the rod 21 is pushed against the barrel 20 to a predetermined indentation position (see Figures 1B and 2); and after the rod-side member 25 changes from the first state to the second state due to the biasing force of the biasing member 26 (see Figure 3), the rod 21 is pushed further against the barrel 20 from the predetermined indentation position (see Figure 4). In this embodiment, before the first drug administration, the rod-side member 25 of the syringe 2 is in the first state and is locked against the rod 21 at the first locking position. Furthermore, when the rod-side member 25 is in the first state, the pressed portion 250 of the rod-side member 25 is pressed by the pressing portion 5 of the auxiliary tool 1, causing the rod 21 to be pushed against the predetermined indentation position, thereby performing the first drug administration. When the pushing operation by the push part 5 is stopped, the biasing force of the biasing member 26 causes the rod-side member 25 to move from the first locking position to the second locking position relative to the rod 21, changing the rod-side member 25 from the first state to the second state. When the rod-side member 25 is in the second state, the syringe 2 is pushed further by the push part 5, causing the rod 21 to be pushed to the completion position, which is located towards the tip beyond the initial push position, thereby administering the drug solution a second time.

[0046] The axial stroke of the rod-side member 25 during drug administration in the first state, i.e., the first drug administration, is approximately the same as the axial stroke of the rod-side member 25 during drug administration in the second state, i.e., the second drug administration. Specifically, the starting position of the movement of the rod-side member 25 in the first state is approximately the same as the starting position of the movement of the rod-side member 25 in the second state. In this embodiment, the starting position of the movement of the rod-side member 25 in the first state is located slightly closer to the base end than the starting position of the movement of the rod-side member 25 in the second state. Also, the ending position of the movement of the rod-side member 25 in the first state is approximately the same as the ending position of the movement of the rod-side member 25 in the second state. In this embodiment, the ending position of the movement of the rod-side member 25 in the second state is located slightly closer to the base end than the ending position of the movement of the rod-side member 25 in the second state.

[0047] The auxiliary device 1 is a device that assists in the dispensing of liquid medicine from the syringe 2. The auxiliary device 1 also includes a housing section 3 for housing the syringe 2. Furthermore, the auxiliary device 1 includes a holding section 4 for holding the barrel 20, a pushing section 5 for pushing the rod 21 toward the tip, and an operating section 6 for moving the pushing section 5 toward the tip in the axial direction.

[0048] The housing section 3 is a roughly cylindrical body with a closed opening at the base end. The central axis C3 of the housing section 3 substantially coincides with the central axis C2 of the syringe 2. Furthermore, the housing section 3 covers the base end and central part of the syringe 2 from the radially outer side. Specifically, the housing section 3 covers the portion of the syringe 2 from the axially central part of the barrel 20, excluding the tip 200, from the radially outer side.

[0049] In this embodiment, the housing section 3 comprises a first housing member 31 and a second housing member 32 attached to the inner diameter of the first housing member 31 (see Figure 1E). The housing section 3 also comprises a tip-side housing section 33 located at the tip end, a base-side housing section 34 located at the base end, and a middle housing section 35 connecting the tip-side housing section 33 and the base-side housing section 34. The housing section 3 also includes a guide section 36. Furthermore, the housing section 3 has a through hole 37 that penetrates in the thickness direction. The material of the housing section 3 is a resin such as ABS (acrylonitrile butadiene styrene).

[0050] The first housing member 31 comprises a first tip-side portion 310 that includes the outer surface of the tip-side housing portion 33, a first base-side portion 311 that includes the outer surface of the base-side housing portion 34, and a first middle portion 312 that includes the outer surface of the middle housing portion 35.

[0051] The first tip portion 310 comprises a vertically split cylindrical portion 313 and a claw 314 extending from the cylindrical portion 313 toward the tip. The outer diameter of the first tip portion 310 is uniform.

[0052] The cylindrical portion 313 is provided with a pair of through holes 313A that penetrate in the thickness direction. The edge portion 313B that demarcates the through holes 313A is rectangular in shape.

[0053] The claws 314 extend from the inner diameter surface of the cylindrical portion 313 toward the tip. Furthermore, a pair of claws 314 are provided, spaced apart in the circumferential direction from the cylindrical portion 313.

[0054] The first base end portion 311 comprises a vertically split cylindrical portion 315 and a claw 316 extending from the cylindrical portion 315 toward the base end. The outer diameter of the first base end portion 311 is uniform.

[0055] One end of the cylindrical portion 315 in the circumferential direction has a notch 315A cut out on the other side in the circumferential direction, except for the tip end portion in the axial direction. This notch 315A constitutes part of the through hole 37 of the housing portion 3.

[0056] The claw 316 extends from the inner diameter surface of the cylindrical portion 315 toward the base end. Furthermore, one claw 316 is provided on the cylindrical portion 315.

[0057] The first central portion 312 is cylindrical in shape when cut lengthwise. The outer diameter of the first central portion 312 is larger towards the base end. In this embodiment, the outer surface of the first central portion 312 is a smooth surface without any steps.

[0058] The second housing member 32 comprises a second tip portion 320 that, together with the first tip portion 310, constitutes the tip portion housing 33; a second base portion 321 that, together with the first base portion 311, constitutes the base portion housing 34; and a second middle portion 322 that, together with the first middle portion 312, constitutes the middle portion housing 35.

[0059] The second tip portion 320 comprises a second extension portion 323 extending circumferentially from the circumferential edge of the first tip portion 310, and a second top plate portion 324 covering the second extension portion 323 and the tip edge of the first tip portion 310 from the tip side.

[0060] The second extension 323 comprises a pair of cylindrical extensions 323A extending circumferentially from each of the circumferential edges of the cylindrical portion 313 of the first tip portion 310. The second extension 323 also comprises a pair of flat plate portions 323B extending radially inward from each cylindrical extension 323A. The outer surface of the boundary between the cylindrical extension 323A and the flat plate portions 323B is rounded, except for the tip end.

[0061] The second top plate portion 324 is disc-shaped with a portion cut out. The second top plate portion 324 is also provided with through holes 324A that penetrate in the thickness direction. These through holes 324A are provided in pairs, aligned in the circumferential direction, and are engaged with the claws 314 of the first tip portion 310.

[0062] The second base end portion 321 includes a pair of circumferentially extending cylindrical portions 325 that extend from each of the circumferentially extending edges of the cylindrical portion 315 of the first base end portion 311. The second base end portion 321 also includes a second bottom plate portion 326 that covers the circumferentially extending cylindrical portions 325 and the base edge of the first base end portion 311 from the base end side.

[0063] The cylindrical extension portion 325, together with the first base end portion 311, constitutes a portion that includes the outer surface of the base end housing portion 34. A notch 325B is provided at the circumferential end of one cylindrical extension portion 325A, together with the notch 315A of the first base end portion 311, to form a through hole 37 of the housing portion 3. The tip edge 325C of each cylindrical extension portion 325 extends inclined so that it is located closer to the base end as it extends circumferentially. A shaft portion 325D protrudes from the inner surface of one cylindrical extension portion 325A (see Figure 1C).

[0064] The second base plate portion 326 is disc-shaped with a portion cut out (see Figure 1E). The second base plate portion 326 also has a through hole that penetrates through it in the thickness direction. The claw 316 of the first base end portion 311 engages with this through hole.

[0065] The second central portion 322 extends in a pair circumferentially from each of the circumferential edges of the first central portion 312.

[0066] The guide portion 36 extends in the direction of the central axis. In this embodiment, the guide portion 36 is provided in the base end housing portion 34. The guide portion 36 also includes a rail guide portion 360 that extends in the direction of the central axis, and in this embodiment, it includes a pair of rail guide portions 360. Furthermore, the guide portion 36 includes a sliding guide portion 361 (see Figure 1B).

[0067] The rail guide portion 360 protrudes radially inward from the inner surface of the cylindrical portion 315 of the first base end portion 311 (see Figure 1E). The rail guide portion 360 also protrudes from the inner surface of the central portion in the circumferential direction of the cylindrical portion 315. The rail guide portion 360 is integral with the cylindrical portion 315. The pair of rail guide portions 360 extend parallel to each other, extending from the base end portion of the first base end portion 311 to the central portion in the axial direction. In this embodiment, the rail guide portion 360 includes a flat plate portion 360A that extends in the central axial direction and radially inward toward the outer surface of the pressing portion 50, and a claw portion 360B provided at the radially inward end of the flat plate portion 360A (see Figure 1C). The claw portion 360B extends in the direction that brings the rail guide portions 360 closer together.

[0068] The sliding guide portion 361 protrudes radially inward from the inner surface of the other cylindrical extension portion 325E of the second base end portion 321 (see Figure 1B). The sliding guide portion 361 also has a sliding surface 361A parallel to the central axis direction. The sliding guide portion 361 is integral with the cylindrical extension portion 325E. Specifically, the sliding guide portion 361 comprises a flat plate-shaped sliding body portion 362 and a connecting portion 363 that connects the sliding body portion 362 and the inner surface of the cylindrical extension portion 325. The surface of the sliding body portion 362 facing radially inward is the sliding surface 361A. The connecting portion 363 extends radially outward from the surface of the sliding body portion 362 facing radially outward. The connecting portion 363 is flat and multiple portions are provided. Specifically, the connecting portion 363 extends from multiple positions with gaps in the axial direction of the sliding body portion 362, in this embodiment, from seven locations.

[0069] The retaining portion 4 is a member for restricting the movement of the barrel 20. The retaining portion 4 also includes an axial retaining portion 40 that holds the barrel 20 at least towards the tip in the axial direction, and a radial retaining portion 41 that holds the barrel 20 in the radial direction (see Figure 1D). In this retaining portion 4, the radial retaining portion 41 is positioned towards the tip relative to the axial retaining portion 40, but it may also be positioned towards the base end relative to the radial retaining portion 41, or it may be positioned at the same location as the radial retaining portion 41 in the axial direction. In this embodiment, the retaining portion 4 is provided in the housing portion 3. The material of the retaining portion 4 is a resin such as ABS (acrylonitrile butadiene styrene).

[0070] The axial holding portion 40 is a portion that can contact the barrel 20 from at least the axial tip side. The axial holding portion 40 also includes at least a tip-side holding portion 400 that holds the barrel 20 in the axial tip direction. In this embodiment, in addition to the tip-side holding portion 400, the axial holding portion 40 includes a base-side holding portion 401 that holds the barrel 20 in the axial base-side direction. The axial holding portion 40 is also provided in the middle housing portion 35. The axial holding portion 40 is integral with the middle housing portion 35. Furthermore, the axial holding portion 40 is provided in the second housing member 32. Note that the axial holding portion 40 may be provided in any part of the housing portion 3.

[0071] The tip-side holding portion 400 is provided at the tip of the second middle portion 322. In this embodiment, the tip-side holding portion 400 comprises a pair of extensions extending inward in the diameter from both ends in the circumferential direction of the tip of the second middle portion 322, and a pair of arc-shaped portions extending circumferentially from the extension ends of each of these extensions to positions with a gap between them (see Figure 1E). The surface 400A of the tip-side holding portion 400 facing the base end abuts against the surface 232A of the barrel-side flange portion 232 of the barrel-side member 23 facing the tip, thereby the tip-side holding portion 400 holds the position of the barrel 20 in the tip-side direction (see Figure 1D).

[0072] The base end retaining portion 401 is provided at the base end of the second intermediate portion 322. In this embodiment, the base end retaining portion 401 comprises a pair of extensions extending inward in the circumferential direction from both ends of the base end of the second intermediate portion 322, and a pair of arc-shaped portions extending circumferentially from the extension ends of each of these extensions to positions with a gap between them (see Figure 1E). The surface 401A of the base end retaining portion 401 facing the tip side abuts against the surface 232B of the barrel side flange portion 232 of the barrel side member 23 facing the base end, thereby the base end retaining portion 401 holds the position of the barrel 20 in the base end direction (see Figure 1D).

[0073] In this embodiment, an extension portion 402 extends from the base end of the base end holding portion 401. This extension portion 402 comprises a pair of covering portions 402A extending from the tip edge 325C of each cylindrical extension portion 325 toward the tip, and a cylindrical portion 402B extending circumferentially to connect the covering portions 402A. The inner diameter of the cylindrical portion 402B is slightly larger than the outer diameter of the barrel-side body 230 of the barrel-side member 23.

[0074] The radial holding portion 41 is a member that surrounds the barrel body 202 of the barrel 20 from the radially outer side. The radial holding portion 41 comprises a first holding portion 411, a second holding portion 412, and a third holding portion 413. In this radial holding portion 41, the second holding portion 412, the first holding portion 411, and the third holding portion 413 are arranged in order from the tip side to the base side in the axial direction. In this embodiment, the radial holding portion 41 is provided in the tip side housing portion 33. The first holding portion 411 is provided in the first housing member 31, and the second holding portion 412 and the third holding portion 413 are provided in the second housing member 32 (see Figure 1E). The radial holding portion 41 may be provided in any part of the housing portion 3. Furthermore, although the radial holding portion 41 comprises three holding portions 411, 412, and 412, it may be composed of a single part, or of two or four or more parts.

[0075] The first retaining portion 411 comprises a vertically split cylindrical portion 411A and a connecting portion 411B that connects the outer surface of the cylindrical portion 411A to the inner surface of the cylindrical portion 313 of the first tip portion 310. The first retaining portion 411 is also integral with the cylindrical portion 313. The cylindrical portion 411A protrudes inward in diameter from the gap between the circumferentially extended edges of a pair of flat plate portions 323B of the second tip portion 320 (see Figure 1D). The inner diameter of the cylindrical portion 411A is slightly larger than the outer diameter of the barrel body 202 of the barrel 20 excluding the tip portion 200. In addition, in a portion of the cylindrical portion 411A, the inner diameter of the cylindrical portion 411A is smaller than the maximum outer diameter of the barrel 20, preventing the barrel 20 from coming out of the cylindrical portion 411A.

[0076] The second retaining portion 412 is a vertically split cylindrical shape. The second retaining portion 412 extends to connect the tips of the pair of flat plate portions 323B. The second retaining portion 412 is integral with the flat plate portions 323B. The inner diameter of the second retaining portion 412 is slightly larger than the outer diameter of the barrel body 202 of the barrel 20 excluding the tip portion 200.

[0077] The third retaining portion 413 is a vertically split cylindrical shape. The third retaining portion 413 extends to connect the base ends of the pair of flat plate portions 323B. The third retaining portion 413 is integral with the flat plate portions 323B. The inner diameter of the third retaining portion 413 is slightly larger than the outer diameter of the barrel body 202 of the barrel 20 excluding the tip portion 200.

[0078] The pushing portion 5 is movable axially toward the tip in order to push the rod 21 toward the tip (see Figure 1B). In other words, the pushing portion 5 is the part that slides the rod 21 toward the tip. The direction of movement of the pushing portion 5 is the same as the direction in which the rod 21 is pushed when the contents are discharged from the barrel 20, which is axial toward the tip.

[0079] Furthermore, the push portion 5 is capable of moving axially from a starting position, which is the starting point of axial movement, towards the tip. This push portion 5 is capable of moving towards the tip from the starting position to the ending position, which is the end point of axial movement. In this embodiment, the push portion 5 is capable of moving towards the tip from a first starting position, which is the starting point of axial movement during the first discharge of contents, to a first ending position, which is the end point of axial movement during the first discharge of contents (see Figure 2). Also, the push portion 5 is capable of moving towards the base end from the first ending position to a second starting position, which is the starting point of axial movement during the second discharge of contents (see Figure 3). Furthermore, the push portion 5 is capable of moving towards the tip from the second starting position to a second ending position, which is the end point of axial movement during the second discharge of contents (see Figure 4). The first starting position is located closer to the base end in the axial direction than the second starting position.

[0080] Furthermore, the pressing portion 5 includes a pressing portion 50 that contacts the rod 21 in order to push the rod 21 in. In addition, the pressing portion 5 comprises a base portion 51 and a side portion 52 (see Figure 1C). The pressing portion 5 also includes a guided portion 53 that engages with the guide portion 36. Furthermore, the pressing portion 5 comprises an extended portion 54 and a pressing connecting portion 55. The material of the pressing portion 5 is a resin such as POM (polyacetal).

[0081] The pressing portion 50 is the part that pushes the rod 21 toward the tip. In this embodiment, the pressing portion 50 pushes the rod 21 toward the tip by contacting the pushing mechanism 22 from the base end side and pushing the pushing mechanism 22 toward the tip, and specifically by contacting the rod-side member 25 from the base end side and pushing the rod-side member 25 toward the tip. The pressing portion 50 is positioned on the base end side with respect to the axial holding portion 40.

[0082] Furthermore, the pressing portion 50 is the part that contacts the pressed portion 250 of the rod-side member 25 (see Figure 1B). The pressing portion 50 is sized and shaped to be able to contact substantially the entire surface of the top plate portion 251 facing the base end, which is the pressed portion 250. In this embodiment, the pressing portion 50 is flat, and specifically, substantially semicircular. In this embodiment, the surface of the pressing portion 50 facing the base end contacts the surface of the top plate portion 251 facing the tip end.

[0083] The base portion 51 is the part that surrounds the rod-side member 25 from the outer diameter (see Figure 1C). The base portion 51 also extends from the surface facing the tip side of the pressing portion 50 toward the tip side. In this embodiment, the base portion 51 is a vertically split cylindrical shape. The inner diameter of the base portion 51 is slightly larger than the outer diameter of the rod-side member 25.

[0084] The side portions 52 are a pair of walls that sandwich the rod-side member 25 from both sides of the cylindrical shaft of the rod-side member 25. The side portions 52 also extend from the surface facing the tip side of the pressing portion 50 toward the tip side. Furthermore, the side portions 52 extend in the circumferential direction from both circumferential edges of the base portion 51.

[0085] The guided portion 53 is the part that is guided by the guide portion 36 of the housing portion 3 when the push portion 5 moves toward the tip in the axial direction. The guided portion 53 also includes a rail engaging portion 530 that extends in the direction of the central axis, and in this embodiment, there is a pair of rail engaging portions 530. Furthermore, the guided portion 53 includes a sliding portion 531 that slides against the sliding surface 361A of the sliding guide portion 361.

[0086] The rail engagement portion 530 is a wall-shaped portion of the guide portion 36 that engages with the rail guide portion 360. The rail engagement portion 530 also includes a flat plate portion 530A that extends in the direction of the central axis and radially outward from the outer surface of the pressing portion 50, and a claw portion 530B provided at the radially outward end of the flat plate portion 530A (see Figure 1C). The claw portion 530B extends in a direction that separates the rail engagement portions 530 from each other.

[0087] The sliding portion 531 is a wall-shaped portion that engages with the sliding guide portion 361 of the guide portion 36 (see Figure 1B). In this embodiment, the sliding portion 531 is composed of one of the pair of side portions 52 of the pressing portion 5, specifically the side portion 52A. The sliding portion 531 also includes a sliding surface 531A on the side portion 52A that is parallel to the central axis direction.

[0088] The extension portion 54 extends from one of the pair of rail engagement portions 530, specifically from the rail engagement portion 530C. Furthermore, the extension portion 54 is a flat plate-shaped portion that extends radially outward from the radially outer surface of the flat plate portion 530A of the rail engagement portion 530C, and also extends axially.

[0089] The push-connecting portion 55 is the part that connects the push portion 5 and the operating portion 6. In this embodiment, the push-connecting portion 55 is a convex portion that protrudes further inward from the inward surface of the tip of the extended portion 54 (see Figure 1E). The push-connecting portion 55 is, for example, cylindrical.

[0090] The operating part 6 is operated in an intersecting direction that crosses the axial direction, thereby moving the push part 5 toward the tip (see Figure 1B). In this embodiment, the operating part 6 is configured to be rotatable along this intersecting direction by a rotational movement.

[0091] Furthermore, the operating section 6 is arranged in parallel with the rod 21 before it is pushed in, in a radial direction perpendicular to the axial direction. This operating section 6 comprises an operating body 60 that can be operated by the user, an extension 61 extending from the operating body 60, a pivot shaft 62 connecting the operating body 60 and the extension 61, and an operating connecting section 63 connecting the operating section 6 and the push section 5 (see Figure 1B).

[0092] Furthermore, a portion of the operating section 6 is housed within the housing section 3, while the remainder protrudes outside the housing section 3. In this embodiment, the operating section 6 partially protrudes outside the housing section 3 through the through hole 37 of the housing section 3. The material of the operating section 6 is a resin such as POM (polyacetal).

[0093] The operating body 60 is the part operated by the user when dispensing the contents from the barrel 20. In this embodiment, the operating body 60 is a lever that the user can grasp, but it may also be a button or the like that the user can press.

[0094] Furthermore, the operating body 60 is operated from the starting position of the operation to one side in the intersecting direction. In this embodiment, the operating body 60 rotates radially from the starting position of the operation by the user pushing the operating body 60 radially inward while gripping it together with the base end housing 34.

[0095] Furthermore, the operating body 60 comprises a vertically split cylindrical small-diameter portion 601 and a vertically split cylindrical large-diameter portion 602 provided on the base end side of the small-diameter portion 601. The operating body 60 also comprises a connecting portion 603 that connects the small-diameter portion 601 and the large-diameter portion 602, a top plate portion 604 extending inward from the tip edge of the small-diameter portion 601, and a wall portion 605 extending inward from the circumferential edge of the small-diameter portion 601 (see Figure 1E).

[0096] The outer diameter of the small-diameter section 601 is smaller than the outer diameter of the large-diameter section 602. Since both the outer surface of the small-diameter section 601 and the outer surface of the large-diameter section 602 are curved, the user can easily grip the operating body 60 when operating it.

[0097] The top plate portion 604 and the wall portion 605 are flat. A through hole 605A is provided at the tip of the wall portion 605, penetrating in the thickness direction of the wall portion 605. The shaft portion 325D of the second base end portion 321 of the second housing member 32 is inserted through this through hole 605A (see Figure 1C).

[0098] The extension portion 61 is a part that moves axially as the operating body portion 60 rotates (see Figure 1E). The extension portion 61 is also a part that is connected to the push portion 5 and moves in conjunction with the push portion 5. In this embodiment, the extension portion 61 is a flat plate-shaped part that overlaps the outer diameter of the operating body portion 60. The extension portion 61 is provided with a through hole 61A that penetrates through the extension portion 61 in the thickness direction. The through hole 61A overlaps with the through hole 605A of the operating body portion 60 in the thickness direction of the extension portion 61 (see Figure 1E).

[0099] The pivot shaft portion 62 is the pivot center in the rotational movement of the operating portion 6. The pivot shaft portion 62 also connects the operating body portion 60 and the extension portion 61. In this embodiment, the pivot shaft portion 62 extends from the housing portion 3, specifically extending radially inward from the inner surface of the base end housing portion 34. More specifically, the pivot shaft portion 62 extends radially inward from the inner surface of the cylindrical portion 315 of the first base end portion 311. The pivot shaft portion 62 is inserted through the through hole 61A of the extension portion 61.

[0100] The operating connection portion 63 is the part to which the operating portion 6 and the pushing portion 5 are connected. In this embodiment, the operating connection portion 63 is a through hole provided in the extension portion 61 and extending through the thickness direction of the extension portion 61, specifically an elongated hole. This elongated hole extends in a direction intersecting the axial direction.

[0101] In the above-described auxiliary device 1, during the first administration of the drug solution using syringe 2, the operation of the operating part 6 causes the push part 5 to move toward the tip, pushing the rod-side member 25, which is in the first state, toward the tip. As a result, the biasing member 26 of the rod-side member 25 is biased toward the base end, and the rod 21 is pushed toward the tip (see Figure 2). When the pushing operation by the push part 5 is stopped, the biasing force of the biasing member 26 causes the rod-side member 25 to move from the first locking position to the second locking position relative to the rod 21, changing the rod-side member 25 from the first state to the second state. Also, the biasing force of the biasing member 26 when the rod-side member 25 changes from the first state to the second state causes the push part 5 to move toward the base end in the axial direction from the position it moved to during administration in the first state, returning to its starting position (see Figure 3). At this time, the operating unit 6 moves from the position after operation during administration in the first state to the other side in the intersecting direction, due to the biasing force of the biasing member 26 when the rod-side member 25 moves from the first state to the second state, and returns to the second operation starting position, which is the starting point for the operation of the operating unit 6 for the second dispensing of the contents. This makes it possible to administer the drug solution a second time using syringe 2.

[0102] In this embodiment, when the operating unit 6 is operated in one direction in the intersecting direction from the first operation start position, which is the starting point of operation of the operating unit 6 for the first dispensing of contents, to the first operation end position, the pushing unit 5 moves toward the tip from the first movement start position to the first movement end position. As the rod-side member 25, which is in the first state, is pushed toward the tip, the biasing member 26 of the rod-side member 25 is biased toward the base end (see Figure 2). Subsequently, when the user's hand is released from the operating unit 6, the biasing of the biasing member 26 causes the rod-side member 25 to change from the first state to the second state. Due to the biasing of the biasing member 26 when the rod-side member 25 changes from the first state to the second state, the pushing unit 5 moves toward the base end in the axial direction from the destination it moved to during dispensing in the first state and returns to the second movement start position (see Figure 3). At this time, the operating unit 6, due to the biasing force of the biasing member 26 when the rod-side member 25 moves from the position after operation during administration in the first state to the other side in the cross direction, and returns to the second operation starting position, which is the starting point for the operation of the operating unit 6 for the second dispensing of the contents. This second operation starting position is located on the other side in the cross direction from the first operation starting position. This makes it possible to administer the drug solution a second time using syringe 2. Furthermore, when the operating unit 6 is operated to one side in the cross direction from the second operation starting position to the second operation ending position, the push part 5 moves towards the tip from the second movement starting position to the second movement ending position, thereby pushing the rod-side member 25, which is in the second state, towards the tip from the second state (see Figure 4).

[0103] Furthermore, when the pushing portion 5 moves in the axial direction, the guided portion 53 is guided by the guide portion 36, causing it to move linearly in the axial direction. In this embodiment, when the pushing portion 5 moves toward the tip in the axial direction or toward the base in the axial direction, the rail engaging portion 530 is guided by the rail guide portion 360 and the sliding portion 531 is guided by the sliding guide portion 361, causing it to move linearly in the axial direction (see Figure 1C). Note that the guided portion 53 may consist only of the rail engaging portion 530, and the guide portion 36 may consist only of the rail guide portion 360. Alternatively, the guided portion 53 may consist only of the sliding portion 531, and the guide portion 36 may consist only of the sliding guide portion 361.

[0104] The following provides a detailed explanation of the operation and various states of auxiliary device 1 when using syringe 2.

[0105] When the drug solution has not yet been administered, that is, before the first administration of the drug solution, the rod-side member 25 is in a first state, locked to the rod 21 at a first locking position (see Figure 1B). Also, the rod-side member 25 is positioned in the initial position, the rod 21 is positioned in the initial position, the push part 5 is positioned at the first movement starting point position, and the operating part 6 is positioned at the first operation starting point position. In this embodiment, in the operating part 6 at the first operation starting point position, the small diameter part 601 and the large diameter part 602 of the operating body part 60 are exposed from the base end housing part 34 with their central axes inclined by a first inclination angle with respect to the cylindrical axis of the base end housing part 34. The first inclination angle is, for example, 1 to 89 degrees.

[0106] From this state, when the user pushes the operating part 6 inward, the pressing part 50 of the pressing part 5 is pressed against the top plate part 251 of the rod-side member 25, which is the part to be pressed 250, and the rod 21, together with the rod-side member 25 in the first state, is pushed toward the tip, and the first drug solution is dispensed (see Figure 2). Specifically, when the operating part 6 is pushed in, the small diameter part 601 and the large diameter part 602 of the operating body part 60 have their central axes slightly inclined with respect to the cylindrical axis of the base end housing part 34, and are positioned substantially along the outer surface of the base end housing part 34. At this time, the operating body part 60 rotates clockwise around the pivot shaft part 62, and the operating connecting part 63 of the extension part 61 rotates clockwise around the pivot shaft part 62. As the operating coupling portion 63 rotates, the pushing portion 5 moves toward the tip, and the pressing portion 50 of the pushing portion 5 pushes the top plate portion 251 of the rod-side member 25 toward the tip. This pushing of the rod-side member 25 toward the tip compresses the biasing member 26, causing it to be biased toward the base end.

[0107] Once the first discharge is complete, the rod-side member 25 is positioned at the first end of movement, the rod 21 is in the pushed-in position, the pushing part 5 is in the first end of movement position, and the operating part 6 is in the first end of operation position. The spring, which is the biasing member 26, is biased toward the base end. When the operation of the operating part 6 is stopped after the first discharge is complete, the pushing of the pushed part 5 toward the pushed part 250 is stopped, the compression of the biasing member 26 is released, and the biasing of the biasing member 26 causes the rod-side member 25 to move from the first locking position to the second locking position relative to the rod 21, changing the rod-side member 25 from the first state to the second state (see Figure 3). In other words, when the compression of the biasing member 26 is released, the rod-side member 25 moves from the tip side toward the base end side relative to the rod 21, resulting in the second state. In this embodiment, the rod-side member 25 moves from the first state to the second state due to the restoring force of the spring, which is the biasing member 26. At this time, the rod 21 does not move from the pushed-in position and remains in that position.

[0108] Furthermore, when the rod-side member 25 moves from the first state to the second state, the biasing force of the biasing member 26 causes the pressing portion 5 to move axially towards the base end from the destination it moved to during administration in the first state, returning to the starting position. Specifically, the biasing force of this biasing member 26 causes the pressing portion 5 to return to the second starting position, which is approximately the same as the first starting position.

[0109] At this time, the operating unit 6 moves radially outward from the position after operation during administration in the first state, due to the biasing force of the biasing member 26 when the rod-side member 25 moves from the first state to the second state, and returns to the second operation starting position. Specifically, due to the biasing force of this biasing member 26, the operating unit 6 returns to the second operation starting position, which is approximately the same position as the first operation starting position.

[0110] In other words, the release of compression from the biasing member 26 causes the top plate portion 251, which acts as the pressed portion 250 of the rod-side member 25, to move the pressing portion 5 toward the base end. Specifically, the base end surface of the top plate portion 251 pushes the tip end surface of the pressing portion 50 of the pressing portion 5 toward the base end, thereby moving the pressing portion 5 toward the base end. Consequently, the operating connection portion 63 of the extension portion 61 rotates counterclockwise around the pivot shaft portion 62, and the operating body portion 60 rotates counterclockwise around the pivot shaft portion 62. As a result, the operating body portion 60 is pushed outward in the diameter.

[0111] When the operating section 6 is in the second operating starting position, the small-diameter section 601 and the large-diameter section 602 of the operating body section 60 are inclined by a second inclination angle with respect to the cylindrical axis of the base end housing section 34, with respect to their central axes. The second inclination angle is greater than the first inclination angle, for example, between 1 and 89 degrees.

[0112] From this state, when the user pushes the operating part 6 inward again, the pressing part 50 is pressed against the top plate portion 251 of the rod-side member 25, which is in the second state, and the rod 21 is pushed toward the tip together with the rod-side member 25, and the second drug solution is dispensed (see Figure 4). The second drug solution dispensing is completed when the piston 212 contacts the inner surface located on the base end side of the tip portion 200 of the barrel 20. Specifically, when the operating part 6 is pushed in, the small diameter portion 601 and the large diameter portion 602 of the operating body portion 60 are tilted by a third inclination angle with respect to the cylindrical axis of the base end housing portion 34. The third inclination angle is smaller than the first inclination angle, for example, between 1 and 89 degrees. At this time, the operating body portion 60 rotates clockwise around the pivot shaft portion 62, and the operating connecting portion 63 of the extension portion 61 rotates clockwise around the pivot shaft portion 62. As the operating coupling part 63 rotates, the pushing part 5 moves toward the tip, and the pressing part 50 of the pushing part 5 pushes the top plate part 251 of the rod-side member 25 toward the tip.

[0113] Once the second discharge is complete, the rod-side member 25 is positioned at the second movement endpoint, the rod 21 is positioned at the completion position, the pusher 5 is positioned at the second movement endpoint, and the operating unit 6 is positioned at the second operation endpoint.

[0114] With the auxiliary device 1 described above, when the operating part 6 of the auxiliary device 1 is operated in the direction of intersection in the axial direction, in this embodiment, the pushing part 5 moves toward the tip side, pushing the rod 21 toward the tip side via the rod side member 25. Therefore, the pushing of the rod 21 toward the tip side along the axial direction can be assisted by the operation of the operating part 6 in the direction of intersection in the axial direction. Thus, when pushing the rod 21, the position of the tip 200 of the barrel 20 is less likely to shift and is easier to hold.

[0115] In this embodiment, the operating part 6 and the rod 21 before being pushed are arranged side by side in the radial direction perpendicular to the axial direction, making it easy to operate the operating part 6.

[0116] Furthermore, in this embodiment, a radial holding portion 41 is positioned at the tip of the axial holding portion 40, and a pressing portion 50 of the auxiliary tool 1 that contacts the rod 21 is positioned at the base end of the axial holding portion 40. In this way, the rod 21 is pushed in by operating the operating portion 6 while the barrel 20 is held in place by the axial holding portion 40 and the radial holding portion 41, making it easier to maintain the position of the syringe 2 relative to the auxiliary tool 1 during this pushing operation.

[0117] Furthermore, in this embodiment, the biasing force of the biasing member 26 when the rod-side member 25 moves from the first state to the second state causes the push portion 5 to return to its starting position from the destination it moved to during administration in the first state, and the operating portion 6 to return to its starting position from the position it was in after operation during administration in the first state. Therefore, after the syringe 2 administers its contents in the first state by operating the operating portion 6, the rod-side member 25 returns to its starting position, and the operating portion 6 returns to its starting position. As a result, the contents of the syringe 2 can be administered in the second state by operating the operating portion 6. In this way, the contents of the syringe 2 can be divided and administered by repeating the same operation.

[0118] In this embodiment, the housing section 3 exposes the tip 200 of the barrel 20 of the syringe 2 from the axial center to the outside. Therefore, when the syringe 2 administers the drug solution by dividing it into two nostrils, it is easy to visually confirm that the tip 200 of the barrel 20 does not touch the inside of the nasal cavity, and it is easy to insert the tip 200 of the barrel 20 into the nasal cavity.

[0119] It should be noted that the auxiliary device of the present invention is not limited to the 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. Furthermore, a part of the configuration of one embodiment can be deleted.

[0120] In the above embodiment, the auxiliary device 1 was applied to a syringe 2 that administers the contents in divided portions, but it may also be applied to a syringe that administers the contents in a single dose without dividing them. In this case, the auxiliary device 1 only needs to be configured such that the operating part 6 is operated from the starting position to one side in the intersecting direction, moving the pushing part 5 toward the tip, and does not return to the starting position after this operation.

[0121] Furthermore, in the above embodiment, the holding portion 4 included an axial holding portion 40 and a radial holding portion 41, but it is sufficient to include at least one of these.

[0122] In the above embodiment, the operating section 6 was arranged in parallel with the rod 21 before it was pushed in, in a radial direction perpendicular to the axial direction, but it may be provided in a different location.

[0123] The configuration of each component of syringe 2 may differ from the configuration described above. For example, syringe 2 does not need to have a spray nozzle 24. In this case, syringe 2 may dispense its contents (e.g., liquid medicine) in a linear stream rather than a mist from the tip 200 of the barrel 20. Alternatively, syringe 2 may have a needle attached to the tip 200 of the barrel 20. In this case, since the tip 200 is exposed to the outside from the axial center of the barrel 20 of syringe 2, it is easy to visually confirm the point where the needle is inserted when using syringe 2. [Explanation of Symbols]

[0124] 1...Auxiliary tool, 2...Syringe, 3...Housing section, 4...Holding section, 5...Pushing section, 6...Operating section, 20...Barrel, 21...Rod, 22...Pushing mechanism, 23...Barrel side member, 24...Injection nozzle, 25...Rod side member, 26...Biasing member, 31...First housing member, 32...Second housing member, 33...Tip side housing section, 34...Base end housing section, 35...Middle housing section, 36...Guide section, 37...Through hole, 40...Axial holding section, 41...Radial holding section, 50...Pressing section, 51...Base section, 52...Side section, 52A...Side section, 53...Guided section, 54...Extended section, 55...Pressing connecting section, 60...Operating body section, 61...Extended section, 61A ...Through hole, 62...Rotating shaft part, 63...Operating connection part, 200...Tip part, 201...Base end part, 202...Barrel body, 203...Flange part, 210...Rod body, 211...Member mounting part, 212...Piston, 230...Barrel side body, 231...Barrel mounting part, 232...Barrel side flange part, 232A, 232B...Surface, 233...Through hole, 250...Pressed part, 251...Top plate part, 252...Skirt part, 253...Outer circumference part, 310...First tip side part, 311...First base end side part, 312...First middle part, 313...Cylindrical part, 313A...Through hole, 313B...Edge part, 314...Claw, 315...Tube Part, 315A... Notch, 316... Claw, 320... Second tip side part, 321... Second base side part, 322... Second middle part, 323... Second extension part, 323A... Cylindrical extension part, 323B... Flat plate part, 324... Second top plate part, 324A... Through hole, 325... Cylindrical extension part, 325A... Cylindrical extension part, 325B... Notch, 325C... Edge, 325D... Shaft part, 325E... Cylindrical extension part, 326... Second bottom plate part, 360... Rail guide part, 360A... Flat plate part, 360B... Claw part, 361... Sliding guide part, 361A... Sliding surface, 362... Sliding body part, 363... Connecting part, 400... Tip side holding part, 400A... Surface , 401... Base end holding part, 401A... Surface, 402... Extension part, 402A... Cover part, 411... First holding part, 411A... Cylindrical part, 411B... Connecting part, 412... Second holding part, 413... Third holding part, 530... Rail engaging part, 530A... Flat plate part, 530B... Claw part, 530C... Rail engaging part, 531... Sliding part, 531A... Sliding surface, 601... Small diameter part, 602... Large diameter part, 603... Connecting part, 604... Top plate part, 605... Wall part, 605A... Through hole, 901... Syringe, 910... Outer cylinder, 912... Main body, 913... Mouth part, 914... Flange, 920... Plunger, C2, C3... Central axis

Claims

1. This invention applies to a syringe comprising a barrel having an axial tip and a base, from which contents can be discharged, and a rod that can be inserted into the barrel from the base end and pushed toward the tip. A holding part for holding the barrel, A pushing portion that is movable toward the tip in the axial direction in order to push the rod toward the tip, The system includes an operating part for moving the pressing part toward the tip in the axial direction, The operating part is an auxiliary tool that moves the pressing part toward the tip when operated in an intersecting direction that intersects the axial direction.

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

3. The holding portion comprises an axial holding portion that holds the barrel at least towards the tip in the axial direction, and a radial holding portion that holds the barrel at the radial direction in the axial direction. The pressing portion includes a pressing portion that contacts the rod in order to push the rod in, The radial holding portion is positioned on the axial end side relative to the axial holding portion. The auxiliary device according to claim 1 or 2, wherein the pressing portion is positioned on the base end side with respect to the axial holding portion.

4. The syringe comprises a rod-side member attached to the rod and configured to switch between a first state in which the rod is locked at a predetermined axial position relative to the rod, and a second state in which the rod is locked at a position closer to the base end in the axial direction than the predetermined position relative to the rod, and a biasing member that engages with the rod and the rod-side member and biases the rod-side member to change from the first state to the second state, wherein the contents can be administered in portions by: an administration in which the rod is pushed to a predetermined indentation position relative to the barrel when the rod-side member is in the first state, and an administration in which the rod is pushed further from the predetermined indentation position relative to the barrel after the rod-side member has changed from the first state to the second state due to the biasing of the biasing member. When the operating part is operated from the starting position of the operation, which is the starting point of the operation, toward one side in the intersecting direction, the pushing part moves from the starting position of the movement, which is the starting point of the movement in the axial direction, toward the tip side in the axial direction. The pressing portion moves from the destination it moved to during administration in the first state toward the base end in the axial direction due to the biasing force of the biasing member when the rod-side member moves from the first state to the second state, and returns to the starting position of the movement. The auxiliary device according to claim 1, wherein the operating part moves from the position after the operation performed during administration in the first state to the other side in the intersecting direction and returns to the operation starting position due to the biasing of the biasing member when the rod-side member changes from the first state to the second state.

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