Syringe

Abstract

This syringe includes: a barrel; a rod; a barrel member; a rod member that is attached to the rod and that is movable between a first state and a second state positioned on a proximal side with respect to the first state; and an urging member that urges the rod member to move from the first state toward the second state. The rod member includes: a locking part that locks to the rod in the first state; a first pressing part that differs from the locking part and that can be pressed toward a distal side on the rod in the first state; and a second pressing part that differs from the locking part and that can be pressed toward the distal side on the rod in the second state. The rod includes a first locking part, a first pressed part, and a second pressed part. The barrel member includes an unlocking part that, in the first state, releases the locking of the locking part and the first locking part in a state in which the rod is pushed to a predetermined position with respect to the barrel.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from Japanese Patent Application No. 2021-107729, the disclosure of which is incorporated herein by reference. [Technical Field]

[0002] The present invention relates to a syringe capable of administering a medicinal liquid filled therein into the nostrils or oral cavity. [Background technology]

[0003] Conventionally, a nasal administration container capable of injecting divided medicinal liquid into both nostrils has been known as a container for administering divided medicinal liquid into the nostrils and the oral cavity of a patient (Patent Document 1). As shown in FIG. 9, the nasal administration container 100 includes a barrel 101 filled with medicinal liquid and a plunger 102 insertable into the barrel 101. The nasal administration container 100 also includes a plunger rod 103 insertable into the plunger 102 and an elastic member 105 provided at the front end of the plunger rod 103 within the plunger 102. A protrusion 1016 is provided on the inner circumferential surface of the barrel 101. The plunger 102 has a first elongated hole portion 1026 and a second elongated hole portion 1028. The plunger rod 103 includes a leaf spring portion 1030L and a pressing portion 1034 located at the rear end of the plunger rod 103. Furthermore, the plunger rod 103 has a first locking portion 1036 and a second locking portion 1038 provided on the leaf spring portion 1030L.

[0004] When administering a medicinal liquid using the nasal administration container 100, the nasal administration container 100 sequentially transitions through the following states: a first administration start state (Figure 10), a first administration completion state (Figure 11), a press-release state (Figure 12), a second administration start state (Figure 13), and a second administration completion state (Figure 14).

[0005] In the first administration start state (FIG. 10), the second locking portion 1038 of the plunger rod 103 is locked to the first elongated hole portion 1026 of the plunger 102 by the biasing force of the elastic member 105. At this time, the elastic member 105 is compressed. Furthermore, the first locking portion 1036 of the plunger rod 103 protrudes outward in the cylindrical radial direction through the first elongated hole portion 1026. The front end portion 1036a of the first locking portion 1036 faces the protruding portion 1016a. In this state, when the user presses the pressing portion 1034 in the direction indicated by arrow AR2, the other end 1020b of the plunger 102 is pressed against the surface 1034a of the pressing portion 1034. As a result, the plunger 102, the plunger rod 103, and the elastic member 105 move forward together relative to the barrel 101, and the medicinal liquid is ejected.

[0006] As the pressing portion 1034 is pressed, the first locking portion 1036 advances toward the protruding portion 1016a and then abuts against the protruding portion 1016a. As the pressing portion 1034 is further pressed, the protruding portion 1016a displaces the first locking portion 1036. At this time, the leaf spring portion 1030L elastically bends in the same direction, centered on the other end 1030b. Following the displacement of the first locking portion 1036, the second locking portion 1038 also displaces in the same direction. This releases the second locking portion 1038 from its engagement with the first elongated hole portion 1026. In this way, the nasal administration container 100 transitions from the first administration start state to the first administration completion state (FIG. 11).

[0007] Next, when the user releases the pressure on the pressing portion 1034, the nasal administration container 100 transitions from the first administration completion state to the pressure-released state (FIG. 12). As a result, the plunger rod 103 retracts in the direction indicated by arrow AR4 due to the restoring force of the elastic member 105, and the nasal administration container 100 transitions from the pressure-released state to the second administration start state (FIG. 13).

[0008] In the second administration start state, the second locking portion 1038 of the plunger rod 103 is locked to the second elongated hole portion 1028 of the plunger 102 by the biasing force of the elastic member 105. In this state, when the user resumes pressing the pressing portion 1034, the plunger 102, plunger rod 103, and elastic member 105 move forward together relative to the barrel 101, and the medicinal liquid is sprayed. This causes the nasal administration container 100 to transition from the second administration start state to the second administration completion state (FIG. 14). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent No. 5786852 Summary of the Invention [Problem to be solved by the invention]

[0010] In the nasal administration container 100, in the first administration start state (FIG. 10), the second locking portion 1038 is locked to the first elongated hole portion 1026, and in the second administration start state (FIG. 13), the second locking portion 1038 is locked to the second elongated hole portion 1028. However, as described above, since the second locking portion 1038 is provided on the leaf spring portion 1030L, if the leaf spring portion 1030L is bent in the locked state, this locking is released. As a result, even if the plunger rod 103 is pressed, the plunger 102 will not move forward, which may prevent the medicinal liquid (contents) from being administered.

[0011] An object of the present invention is to provide a syringe that can divide the contents and administer two doses, and that can reliably administer two doses. [Means for solving the problem]

[0012] The syringe of the present invention is a syringe for administering contents in divided portions, and comprises: a barrel having a tip end and a base end in an axial direction and capable of discharging the contents from the tip end; a rod inserted into the barrel from the base end side in the axial direction and capable of being pushed toward the tip end; a barrel side member attached to the barrel; a rod side member attached to the rod and configured to be movable between a first state in which it is engaged with the rod at a predetermined position in the axial direction, and a second state in which it is positioned on the base end side in the axial direction relative to the first state; and a biasing member engaged with the rod and the rod side member and biasing the rod side member to move from the first state to the second state, wherein the rod side member is axially movable relative to the rod in the first state. a first pressing portion that is a separate portion from the locking portion and that can be pressed against the rod toward the axial tip end in the first state, and a second pressing portion that is a separate portion from the locking portion in the second state, the rod has a first locking portion with which the locking portion locks in the first state, a first pressed portion against which the first pressing portion is pressed in the first state, and a second pressed portion against which the second pressing portion is pressed in the second state, and the barrel side member has an unlocking portion that releases the lock between the locking portion and the first locking portion when the rod is pressed to a predetermined position relative to the barrel in the first state.

[0013] Moreover, in the syringe, the barrel may include a barrel body and a flange portion provided on the barrel body, the barrel side member is attached to the barrel by fitting onto the flange portion, and the rod may include a rod body and a member attachment portion provided on the rod body, and the rod side member may be attached to the member attachment portion.

[0014] Furthermore, in the syringe, the second pressing portion includes an elastic portion having elasticity in a radial direction perpendicular to the axial direction, and a pressing surface portion provided on the elastic portion, the pressing surface portion having a pressing surface that faces the tip side in the axial direction and is a plane perpendicular to the axial direction, and the second pressed portion includes a pressed surface portion having a pressed surface that faces the base end side in the axial direction and is a plane perpendicular to the axial direction, and in the second state, the pressing surface may be held in a position where it can abut against the pressed surface from the base end side in the axial direction by the elasticity of the elastic portion. [Brief explanation of the drawings]

[0015] [Figure 1A] FIG. 1A is a front view of a syringe according to a first embodiment in a first state. [Figure 1B] FIG. 1B is a cross-sectional view of a main part of the syringe in a first state. [Figure 1C] FIG. 1C is a side view of the syringe in a first state. [Figure 1D] FIG. 1D is a cross-sectional view of a main part of the syringe in a first state. [Figure 2] FIG. 2 is an exploded perspective view of the syringe. [Figure 3A] FIG. 3A is a front view of the syringe in a restricted state. [Figure 3B] FIG. 3B is a cross-sectional view of a main part of the syringe in a restricted state. [Figure 3C] FIG. 3C is a side view of the syringe in a restricted state. [Figure 3D] FIG. 3D is a cross-sectional view of a main part of the syringe in a restricted state. [Figure 4A] FIG. 4A is a cross-sectional view of a main part of the syringe just before the syringe is in a restricted state. [Figure 4B] FIG. 4B is a cross-sectional view of a main part of the syringe in a restricted state. [Figure 5A] FIG. 5A is a front view of the syringe in a second state. [Figure 5B] FIG. 5B is a cross-sectional view of a main part of the syringe in a second state. [Figure 5C] FIG. 5C is a side view of the syringe in a second state. [Figure 5D] FIG. 5D is a cross-sectional view of a main part of the syringe in a second state. [Figure 6A] FIG. 6A is a front view of the syringe in a completed state. [Figure 6B] FIG. 6B is a cross-sectional view of the essential parts of the syringe in a completed state. [Figure 6C] FIG. 6C is a side view of the syringe in a completed state. [Figure 6D] FIG. 6D is a cross-sectional view of the syringe in a completed state. [Figure 7] FIG. 7 is a cross-sectional view of a main part of a syringe according to a second embodiment in a first state. [Figure 8] FIG. 8 is a cross-sectional view of a main part of the syringe in a second state. [Figure 9] FIG. 9 is a cross-sectional view of a conventional nasal administration container in a prepared state. [Figure 10] FIG. 10 is a cross-sectional view of the nasal administration container in a first administration start state. [Figure 11] FIG. 11 is a cross-sectional view of the nasal administration container in a first administration completion state. [Figure 12] FIG. 12 is a cross-sectional view of the nasal administration container in a pressed and released state. [Figure 13] FIG. 13 is a cross-sectional view of the nasal administration container in a second administration start state. [Figure 14] FIG. 14 is a cross-sectional view of the nasal administration container in a second administration completion state. DETAILED DESCRIPTION OF THE INVENTION

[0016] A container according to a first embodiment of the present invention will be described below with reference to FIGS. 1A to 6D.

[0017] As shown in FIGS. 1A to 1D, syringe 1 is a syringe for administering divided doses of its contents. Specifically, syringe 1 is a nasal administration container that can administer divided mist-like liquid medicine into both nostrils. This syringe 1 administers the liquid medicine in two divided doses, but the liquid medicine may also be administered in three or more divided doses. The liquid medicine is a liquid medicine, such as an influenza vaccine. Syringe 1 is approximately cylindrical in shape.

[0018] 2, the syringe 1 includes a barrel 2 having a distal end 20 and a proximal end 21 in the axial direction and capable of discharging a content from the distal end 20, and a rod 3 that is inserted into the barrel 2 from the proximal end side in the axial direction and can be pushed toward the distal end side. The syringe 1 also includes a barrel-side member 4 attached to the barrel 2, and a rod-side member 5 attached to the rod 3 and configured to be movable between a first state in which the rod-side member 5 is locked at a predetermined axial position relative to the rod 3, and a second state in which the rod-side member 5 is positioned closer to the proximal end in the axial direction relative to the first state. The syringe 1 also includes a biasing member 6 that is locked to the rod 3 and the rod-side member 5 and biases the rod-side member 5 to move from the first state toward the second state.

[0019] The syringe 1 of this embodiment also includes an injection nozzle 7. Furthermore, the syringe 1 also includes a push-in restriction mechanism 8 that restricts the rod side member 5 from being pushed toward the tip end after the first ejection of the content and before the rod 3 reaches the second state (see FIGS. 3A and 3B).

[0020] In the syringe 1, the side where the tip portion 20 of the barrel 2 is located (the lower side in Figures 1A to 1D and 3A to 6D) is the "tip side," and the side where the base end portion 21 of the barrel 2 is located (the upper side in Figures 1A to 1D and 3A to 6D) is the "base side." Also, the "axial direction" of the syringe 1 is the cylindrical axis direction of the syringe 1. Furthermore, the radial direction of the syringe 1 will also be simply referred to as the "radial direction."

[0021] When using the syringe 1, the rod 3 is pushed from the first state where the rod 3 is raised to the base end (see FIGS. 1A to 1D) toward the tip end to perform the first spray of the liquid medicine and enter the restricted state (see FIGS. 3A to 3D). Next, after passing through the second state where the rod 3 is raised to the base end (see FIGS. 5A to 5D), the rod 3 is pushed further toward the base end to perform the second spray of the liquid medicine and enter the completed state (see FIGS. 6A to 6D).

[0022] Each component of the syringe 1 will be described in detail below.

[0023] The barrel 2 is a member that contains a medicinal liquid therein (see FIG. 2). In the syringe 1 of this embodiment, the barrel 2 includes a barrel body 22 and a flange portion 23 provided on the barrel body 22.

[0024] The barrel body 22 is a cylindrical part. In this barrel 2, a body distal end portion 220, which is the distal end of the barrel body 22, constitutes the distal end portion 20 of the barrel 2, and a body proximal end portion 221, which is the proximal end portion of the barrel body 22, constitutes the proximal end portion 21 of the barrel 2. In addition to the body distal end portion 220 and the body proximal end portion 221, the barrel body 22 is equipped with a cylindrical body connecting portion 222 that connects the body distal end portion 220 and the body proximal end portion 221.

[0025] For example, the flange portion 23 extends outward (in the radially outward direction of the barrel main body 22) from the entire outer periphery of one end in the cylindrical axis direction of the base end portion 21. That is, the flange portion 23 has an annular (for example, circular) shape when viewed in the cylindrical axis direction.

[0026] The outer diameter of the main body tip portion 220 is smaller than the outer diameter of the main body connecting portion 222. The outer diameter of the main body connecting portion 222 is substantially the same at any position in the cylindrical axis direction.

[0027] Barrel 2 is formed, for example, from a transparent material that can withstand the internal pressure applied when administering the medicinal solution. Specifically, the material of barrel 2 is glass, a resin containing a cyclic olefin such as norbornene as a repeating unit, etc. More specifically, the material of barrel 2 is glass, a transparent resin such as COP (cycloolefin polymer), which is a homopolymer of cyclic olefin, or COC (cycloolefin copolymer), which is a copolymer of cyclic olefin and ethylene, etc.

[0028] The rod-side member 5 is a member that is operated when discharging the content in the barrel 2. The rod-side member 5 has, for example, a substantially cylindrical appearance. The rod-side member 5 includes a locking portion 50, a first pressing portion 51, and a second pressing portion 52 (see FIGS. 1A to 1D). In the syringe 1 of this embodiment, the rod-side member 5 includes a third pressing portion 53 that can be pressed against the rod toward the axial tip end in the second state.

[0029] The rod-side member 5 also includes a top plate portion 54 and a skirt portion 55 extending from the top plate portion 54 toward the tip side. The rod-side member 5 also includes an extension portion 56 that covers the locking portion 50 from the radially outer side. The rod-side member 5 also includes a push-in abutment portion 57 that constitutes a part of the push-in restriction mechanism 8.

[0030] Top plate 54 has a flat plate shape extending in the radial direction, and in this embodiment, is a disk shape. Furthermore, top plate 54 is pressed toward the tip by the user of syringe 1 when discharging the content in barrel 2. Furthermore, outer peripheral portion 540 of top plate 54 has a rounded surface, but may also have a curved surface.

[0031] The skirt portion 55 extends from an outer peripheral portion 540 of the top plate portion 54 toward the tip side. The skirt portion 55 is continuous along the entire outer periphery of the top plate portion 54, and is, for example, cylindrical.

[0032] In the first state, the locking portion 50 locks the rod 3 in the axial direction (see FIGS. 1A and 1B). A pair of locking portions 50 are provided facing each other in the radial direction across the axis of the rod 3. The pair of locking portions 50 are arranged, for example, on opposite sides of the rod 3. Furthermore, the locking portion 50 extends from a position inside the outer peripheral portion 540 of the top plate portion 54 toward the tip side. For example, the locking portion 50 includes a locking elastic portion 500 having elasticity in a radial direction perpendicular to the axial direction, and a locking piece 501 provided on the locking elastic portion 500 and extending radially outward.

[0033] The elastic locking part 500 is a plate-like (e.g., long plate-like) member extending along the axial direction. The elastic locking part 500 extends from a part inside the outer peripheral part 540 of the top panel part 54 toward the tip side.

[0034] The locking piece 501 extends radially outward from the tip end of the elastic locking part 500. As shown in FIGS. 4A and 4B , the locking piece 501 faces the base end in the axial direction and has a locking surface 502, which is a flat surface perpendicular to the axial direction. The outer surface 506, which faces radially outward of the locking piece 501, has a first outer surface 503 facing the base end and a second outer surface 504 facing the tip end. The outer surface 506 also has a third outer surface 505 connecting the first outer surface 503 and the second outer surface 504.

[0035] The first outer surface 503 extends at an incline relative to the radial direction perpendicular to the axial direction. The first outer surface 503 is inclined so that the closer it is to the base end, the more radially inward it is positioned. In this locking piece 501, the first outer surface 503 extends from the radially outer end of the locking surface 502. The first outer surface 503 is located closer to the base end in the axial direction than the third outer surface 505.

[0036] The second outer surface 504 extends at an angle relative to the radial direction perpendicular to the axial direction. The second outer surface 504 is also angled so that the portion closer to the base end is positioned radially outward. The second outer surface 504 is positioned closer to the tip end in the axial direction than the third outer surface 505.

[0037] The third outer surface 505 extends along the axial direction and is located on the distal end side of the first outer surface 503 in the axial direction.

[0038] The first pressing portion 51 extends, for example, from the top plate portion 54 (specifically, a portion radially inward of the outer peripheral portion 540 of the top plate portion 54) toward the tip side (see FIGS. 1C and 1D). In the first state, the first pressing portion 51 can be pressed against the rod 3 toward the tip side in the axial direction. The first pressing portion 51 is a separate portion from the locking portion 50.

[0039] In the syringe 1 of this embodiment, the first pressing portion 51 comprises an extension portion 510 extending from the top plate portion 54 toward the tip side, and a first pressing surface portion 512 provided on the extension portion 510, facing toward the tip side in the axial direction, and having a first pressing surface 511 which is a plane perpendicular to the axial direction.

[0040] As shown in FIGS. 5C and 5D , the second pressing portion 52 extends from the skirt portion 55 toward the tip end, for example. A pair of second pressing portions 52 are provided radially across the axis of the rod 3. The second pressing portion 52 is disposed between the pair of locking portions 50 in the circumferential direction. Specifically, the second pressing portion 52 is disposed between the pair of locking portions 50 at equal intervals in the circumferential direction. That is, the rod-side member 5 of this embodiment includes a plurality of locking portions 50 spaced apart in the circumferential direction and a plurality of second pressing portions 52 disposed between adjacent locking portions 50 in the circumferential direction. In the second state, the second pressing portion 52 can press the rod 3 toward the tip end in the axial direction. The second pressing portion 52 is a separate portion from the locking portions 50. The second pressing portion 52 is formed from the radially outer side toward the radially inner side.

[0041] In syringe 1 of this embodiment, second pressing portion 52 includes elastic portion 520 having elasticity in a radial direction perpendicular to the axial direction. Second pressing portion 52 also includes second pressing surface portion 522 as a pressing surface portion that is provided on elastic portion 520, faces the tip side in the axial direction, and has second pressing surface 521 as a pressing surface that is a flat surface perpendicular to the axial direction.

[0042] The elastic portion 520 is a plate-like (for example, long plate-like) member extending along the axial direction. The elastic portion 520 extends from an outer peripheral portion 540 of the top plate portion 54 toward the tip side.

[0043] The second pressing surface 521 is a flat surface extending radially inward from the inner periphery of the rod side member 5 .

[0044] The second pressing surface portion 522 extends radially inward from the tip end of the elastic portion 520. Furthermore, the inner circumferential surface 523 of the second pressing surface portion 522 has, in addition to the second pressing surface 521, a base-side inner circumferential surface 524 that faces the base end in the axial direction and is a flat surface perpendicular to the axial direction. The inner circumferential surface 523 has a connecting inner circumferential surface 525 that extends along the axial direction and connects the second pressing surface 521 and the base-side inner circumferential surface 524.

[0045] 5A and 5B, the third pressing portion 53 extends, for example, from the top plate portion 54 (specifically, a portion radially inward of an outer peripheral portion 540 of the top plate portion 54) toward the tip side. The third pressing portion 53 also has a third pressing surface 530 that faces the tip side in the axial direction and is a flat surface perpendicular to the axial direction.

[0046] In the syringe 1 of this embodiment, the locking portion 50 also serves as the third pressing portion 53, but the third pressing portion 53 may be a portion of the rod side member 5 separate from the locking portion 50.

[0047] 3A and 4B, the push-in contact portion 57 constituting the push-in restriction mechanism 8 extends from the top plate portion 54 (specifically, from the outer peripheral portion 540 of the top plate portion 54) toward the tip side. The push-in contact portion 57 also has a push-in contact surface 570 that faces the tip side in the axial direction and is a flat surface perpendicular to the axial direction.

[0048] In the syringe 1 of this embodiment, the push-in contact surface 570 is provided on a portion in the circumferential direction, but may be provided continuously over the entire circumference.

[0049] The rod 3 is a member that moves together with the rod-side member 5 when discharging the content in the barrel 2. The rod 3 has an axial shape.

[0050] The rod 3 includes a first locking portion 30, a first pressed portion 31, and a second pressed portion 32 (see FIGS. 1A to 1D, 3C, and 3D). The rod 3 also includes a third pressed portion 33. The rod 3 also includes a second locking portion 34 (see FIGS. 5A and 5B).

[0051] In the syringe 1 of this embodiment, the rod 3 includes a rod main body 35 and a member attachment portion 36 provided on the rod main body 35 (see FIG. 2). The rod 3 also includes a piston 37 provided on the rod main body 35. The rod 3 includes the member attachment portion 36 at the base end of the rod main body 35, and the piston 37 at the tip end of the rod main body 35. The rod 3 is inserted into the barrel 2 in an orientation in which the member attachment portion 36 is located on the base end side and the piston 37 is located on the tip end side.

[0052] In this rod 3, the member mounting portion 36, the rod main body 35, and the piston 37 are continuous in the axial direction from the base end to the tip end. In addition, in this rod 3, the rod main body 35 and the member mounting portion 36 are molded as a single unit. The rod main body 35 and the piston 37 are separate members, and are formed by connecting these members. Note that at least two of the rod main body 35, the member mounting portion 36, and the piston 37 may be formed as a single unit, or all may be separate members.

[0053] The rod main body 35 is a shaft-shaped portion. The rod 3 has a shaft portion 350 and a plurality (for example, four) of pressure accumulating protrusions 351 that protrude from the shaft portion 350 in the outer diameter direction of the rod 3. Specifically, the pressure accumulating protrusions 351 include a plurality (for example, two) of base-end-side pressure accumulating protrusions 351a arranged on the base-end side, and a plurality (for example, two) of tip-end-side pressure accumulating protrusions 351b arranged on the tip-end side. In this rod 3, the plurality of base-end-side pressure accumulating protrusions 351a are provided at equal intervals in the circumferential direction of the rod 3. The tip-end-side pressure accumulating protrusions 351b are also similarly provided at equal intervals in the circumferential direction of the rod 3.

[0054] The rod-side component 5 is attached to the component attachment portion 36. The component attachment portion 36 has, for example, an expanded width portion 360 whose width increases toward the base end when viewed from the side. The component attachment portion 36 has an insertion hole 361 formed in the radial center portion along the axial direction (see FIG. 1A). A pair of locking portions 50 of the rod-side component 5 is inserted into this insertion hole 361.

[0055] Piston 37 is a member that can come into contact with inner surface 200 located on the base end side of tip portion 20 of barrel 2. Piston 37 also comes into close contact with the entire inner circumferential surface of main body connecting portion 222 of barrel 2. As shown in FIGS. 6A to 6D , tip surface 370 of piston 37 in this embodiment comes into contact with inner surface 200 of tip portion 20 of barrel 2 when administration of the medicinal liquid is completed (specifically, after the second ejection of the medicinal liquid).

[0056] In the first state, the first locking portion 30 locks with the locking portion 50 of the rod-side member 5 (see FIGS. 1A and 1B). The first locking portion 30 also has a first locking surface 300 that faces the distal end in the axial direction and is a plane perpendicular to the axial direction. This first locking surface 300 locks with the locking surface 502 (see FIG. 4A). That is, the locking portion 50 and the first locking portion 30 are locked in the axial direction with the locking portion 50 positioned on the distal end side in the axial direction and the first locking portion 30 positioned on the proximal end side in the axial direction. This locking restricts the rod-side member 5 in the first state from moving axially toward the proximal end side (i.e., toward the second state) relative to the rod 3.

[0057] Furthermore, a pair of first locking portions 30 are provided facing each other in the radial direction across the axis of the rod 3. The pair of first locking portions 30 are arranged, for example, on opposite sides of the rod 3. In the syringe 1 of this embodiment, the first locking portion 30 is the tip end portion of the member mounting portion 36. The first locking portion 30 is a through-hole portion in which a first through-hole 301 penetrating in the radial direction is formed.

[0058] Furthermore, in the syringe 1 of this embodiment, the extension portion 56 of the rod side member 5 covers the locking portion 50 from the radially outer side. This prevents the user from touching the locking portion 50 when using the syringe 1, and prevents the locking portion 50 and the first locking portion 30 from unintentionally coming out of engagement with each other.

[0059] In the second state, the second locking portion 34 is locked by the locking portion 50 of the rod side member 5. The second locking portion 34 faces the tip side in the axial direction and has a second locking surface 340 which is a plane perpendicular to the axial direction. A pair of second locking portions 34 are provided in the radial direction so as to sandwich the axis of the rod 3. The second locking portion 34 is a through-hole portion in which a second through-hole 341 penetrating in the radial direction is formed.

[0060] In the first state, the first pressed portion 31 is pressed against the first pressing portion 51 of the rod side member 5 (see FIGS. 1C and 1D). The first pressed portion 31 faces the base end side in the axial direction and has a first pressed surface 310 which is a flat surface perpendicular to the axial direction. This first pressed surface 310 is pressed against the first pressing surface 511. In the syringe 1 of this embodiment, the first pressed portion 31 is the base end portion of the rod 3 (specifically, the base end portion of the member mounting portion 36).

[0061] In the second state, the second pressing portion 52 of the rod side member 5 is pressed against the second pressed portion 32 (see FIGS. 5C and 5D). The second pressed portion 32 faces the base end side in the axial direction and includes a second pressed surface portion 321 as a pressed surface portion having a second pressed surface 320 as a pressed surface that is a plane perpendicular to the axial direction. The second pressed portion 32 is formed from the radially inner side to the radially outer side of the rod 3.

[0062] Specifically, second pressed surface 320 is a flat surface extending radially outward from the outer periphery of component mounting portion 36. In syringe 1 of the present embodiment, second pressed portion 32 is disposed at the base end of component mounting portion 36. Second pressed portion 32 is recessed radially inward, and second pressed surface 320 is formed in a stepped shape.

[0063] A pair of second pressed portions 32 are provided in the radial direction on either side of the axis of the rod 3. The second pressed portion 32 is arranged between the pair of second locking portions 34 in the circumferential direction. Specifically, the second pressed portion 32 is arranged between the pair of second locking portions 34 at equal intervals from the second locking portions 34 in the circumferential direction. That is, the rod 3 of this embodiment includes a plurality of second locking portions 34 provided at intervals in the circumferential direction, and a plurality of second pressed portions 32 arranged between adjacent second locking portions 34 in the circumferential direction.

[0064] In the second state, the third pressed portion 33 is pressed by the third pressing portion 53 of the rod side member 5 (see FIGS. 5A and 5B). The third pressed portion 33 has a third pressed surface 330, which is a plane facing the base end in the axial direction and perpendicular to the axial direction. The third pressed portion 33 and the second locking portion 34 are arranged opposite each other in the axial direction. In this syringe 1, the third pressed portion 33 is arranged on the tip side in the axial direction, and the second locking portion 34 is arranged on the base end side in the axial direction. In the second state, the locking portion 50 is located between the third pressed portion 33 and the second locking portion 34.

[0065] Furthermore, a pair of third pressed portions 33 are provided in the radial direction on either side of the axis of the rod 3. The third pressed portion 33 is arranged between the pair of second pressed portions 32 in the circumferential direction. Specifically, the third pressed portion 33 is arranged between the pair of second pressed portions 32 and is equally spaced apart from the second pressed portions 32 in the circumferential direction. That is, the rod 3 of this embodiment includes a plurality of second pressed portions 32 arranged at intervals in the circumferential direction, and a plurality of third pressed portions 33 arranged between adjacent second pressed portions 32 in the circumferential direction.

[0066] The hole forming surface on the base end side of the second through hole 341 in the through hole portion is the second locking surface 340. The hole forming surface on the tip end side of the second through hole 341 is the third pressed surface 330.

[0067] In this syringe 1, the locking portion 50 engages with the first locking portion 30 from the radially inner side, thereby locking the first locking portion 30 and the locking portion 50 together (first state, FIGS. 1A and 1B). When the locking portion 50 retreats radially inward relative to the first locking portion 30, the locking is released (FIGS. 4A and 4B). The locking portion 50 moves through the insertion hole 361 toward the base end and engages with the second locking portion 34 from the radially inner side, thereby locking the second locking portion 34 and the locking portion 50 together (second state, FIGS. 5A and 5B).

[0068] The rod 3 is made of a resin such as POM (polyacetal).

[0069] In the first state, the barrel side member 4 includes an unlocking portion 40 that unlocks the lock between the locking portion 50 of the rod side member 5 and the first locking portion 30 of the rod 3 when the rod 3 is pushed to a predetermined position relative to the barrel 2 (see FIGS. 1A and 1B). In the syringe 1 of this embodiment, the barrel side member 4 is attached to the barrel 2 by fitting onto the flange portion 23 of the barrel 2.

[0070] Furthermore, in addition to the unlocking portion 40, the barrel side member 4 also includes a barrel attachment portion 41 that fits onto the flange portion 23 of the barrel 2, and a finger hook portion 42 that functions as a finger grip. By configuring the unlocking portion 40, the barrel attachment portion 41, and the finger hook portion 42 in this way as a single member, the barrel side member 4, the configuration of the syringe 1 is simplified.

[0071] Furthermore, the barrel side member 4 includes a cylindrical barrel side main body 43. In this barrel side member 4, the barrel side main body 43 and the barrel attachment portion 41 are continuous from the base end side to the tip end side. The barrel side member 4 also includes a push-in restriction portion 44 that constitutes a part of the push-in restriction mechanism 8.

[0072] The barrel mounting portion 41 extends continuously in the circumferential direction of the barrel 2. That is, the barrel mounting portion 41 is formed in an annular shape. The barrel mounting portion 41 is provided with mounting portion through-holes 410 through which a portion of the flange portion 23 of the barrel 2 is exposed. The barrel mounting portion 41 is provided with a pair of mounting portion through-holes 410. In the syringe 1 of this embodiment, the barrel mounting portion 41 has a pressure accumulating portion 411 that extends radially inward and can be engaged with the pressure accumulating protrusion 351.

[0073] The finger hook portion 42 extends radially outward from the barrel mounting portion 41. In addition, a pair of finger hook portions 42 are provided, for example, sandwiching the barrel 2. The finger hook portions 42 are arranged at positions that avoid the mounting portion through-hole 410 of the barrel mounting portion 41.

[0074] The barrel side main body 43 is a portion located on the base end side of the barrel 2. The barrel side main body 43 extends further toward the base end side from the base end of the barrel attachment portion 41. The barrel side main body 43 is, for example, cylindrical. The outer diameter of the barrel side main body 43 is substantially the same at any portion in the axial direction, or is tapered so that it becomes thinner toward the tip end in the axial direction.

[0075] The unlocking portion 40 is a portion that unlocks the lock between the locking portion 50 of the rod side member 5 and the first locking portion 30 of the rod 3 when the rod 3 is pushed to a predetermined position relative to the barrel 2 in the first state (see FIGS. 4A and 4B). The unlocking portion 40 also has, for example, an inclined surface 400 that faces the base end and is inclined relative to a radial direction perpendicular to the axial direction. In the syringe 1 of this embodiment, the unlocking portion 40 is located at the base end of the barrel side main body 43.

[0076] The push-in restricting portion 44 constituting the push-in restricting mechanism 8 is a portion that restricts the movement of the push-in contact portion 57 of the rod side member 5 toward the distal end. The push-in restricting portion 44 has, for example, a push-in restricting surface 440 that faces the proximal end and is a flat surface perpendicular to the radial direction orthogonal to the axial direction. The push-in restricting surface 440 abuts against the push-in contact surface 570. In the syringe 1 of this embodiment, the push-in restricting portion 44 is located at the proximal end of the barrel side main body 43.

[0077] In the syringe 1 of this embodiment, the push-in restriction surface 440 is provided continuously around the entire circumference, but may be provided on a part of the circumference.

[0078] The material of the barrel side member 4 is a resin such as PP (polypropylene).

[0079] The biasing member 6 is an elastic member that is arranged inside the rod-side member 5 together with the base end portion (for example, the component mounting portion 36) of the rod 3. The biasing member 6 is arranged between the top plate portion 54 of the rod-side member 5 and the component mounting portion 36. The biasing member 6 is engaged with the top plate portion 54 and the component mounting portion 36, and biases the rod-side member 5 to move toward the base end (first state).

[0080] In the syringe 1 of this embodiment, the biasing member 6 is, for example, a spring (specifically, a metal spring) (see FIG. 2). Specifically, the biasing member 6 is a compression spring.

[0081] The biasing member 6 may be a member other than a metal spring, such as a resin spring. When the syringe 1 includes a resin spring as the biasing member 6, the resin spring and the rod 3 may be integrally molded, or the resin spring and the rod side member 5 may be integrally molded.

[0082] The spray nozzle 7 is a part that extracts the medicinal liquid. The spray nozzle 7 of this embodiment is configured to spray the medicinal liquid in the form of a mist.

[0083] The operations and states when using the syringe 1 will be described in detail below.

[0084] The first state is an initial state in which the medicinal liquid has not yet been sprayed. In the first state, the rod-side member 5 is locked at a predetermined axial position relative to the rod 3 by the locking portion 50 locking with the first locking portion 30 of the rod 3 (see FIGS. 1A and 1B). Specifically, the rod-side member 5 is locked at a predetermined axial position relative to the rod 3 by the locking surface 502 of the locking portion 50 locking with the first locking surface 300 of the first locking portion 30. The locking between the locking portion 50 and the first locking portion 30 restricts movement of the rod-side member 5 toward the base end.

[0085] When the user of the syringe 1 presses the rod side member 5 (specifically, the top plate portion 54) toward the distal end from the first state (see FIGS. 1C and 1D), the first pressing portion 51 of the rod side member 5 is pressed against the first pressed portion 31 of the rod 3. As a result, the rod 3 is pressed toward the distal end together with the rod side member 5, the initial spray of the liquid medicine is performed, and the syringe 1 enters the restricted state (see FIGS. 3C and 3D). Specifically, the first pressing surface 511 of the first pressing portion 51 is pressed against the first pressed surface 310 of the first pressed portion 31.

[0086] Furthermore, from the first state to the restricted state, the engagement between the locking portion 50 and the first locking portion 30 keeps the biasing member 6 biasing the rod side member 5 to move from the first state toward the second state.

[0087] In the syringe 1 of this embodiment, at the time of the first spray of the medicinal liquid, the pressure accumulating portion 411 of the barrel side member 4 and the pressure accumulating protrusion 351 of the rod 3 form a pressure accumulating means (see FIGS. 1A and 1B). Specifically, at the time of the first spray of the medicinal liquid, when the rod 3 is pushed in together with the rod side member 5, the rod 3 is subjected to resistance when the tip side pressure accumulating protrusion 351b of the rod 3 overcomes the pressure accumulating portion 411. As a result, at the time of the first spray of the medicinal liquid, the rod 3 can be biased to a level at which the medicinal liquid can be discharged in a mist form.

[0088] As described above, the syringe 1 is placed in a restricted state by pushing the rod 3 toward the distal end to perform the initial spray of the liquid medicine (see FIGS. 3A to 3D). The initial spray of the liquid medicine is completed when the rod-side member 5 abuts against the barrel-side member 4. For example, the initial spray of the liquid medicine is completed by the operation of the push-in restriction mechanism 8. Specifically, the initial spray of the liquid medicine is completed when the push-in abutment portion 57 of the rod-side member 5 abuts against the push-in restriction portion 44 of the barrel-side member 4. At this time, in the syringe 1 of this embodiment, the push-in abutment surface 570 of the push-in abutment portion 57 abuts against the push-in restriction surface 440 of the push-in restriction portion 44 (see FIGS. 3A and 3B).

[0089] As described above, the syringe 1 of this embodiment is provided with a push-in restriction mechanism 8 that restricts the rod side member 5 from being pushed toward the tip end when the rod 3 and the rod side member 5 are pushed toward the tip end by a predetermined length (amount for initial injection) from the first state. Therefore, it is possible to prevent the rod 3 from being pushed toward the tip end more than necessary during the initial administration, and an appropriate amount of content can be ejected during the initial administration.

[0090] Furthermore, when the initial spraying of the liquid medicine is completed, the unlocking portion 40 of the barrel-side member 4 unlocks the lock between the locking portion 50 of the rod-side member 5 and the first locking portion 30 of the rod 3 (see FIGS. 4A and 4B). Specifically, the second outer surface 504 of the locking portion 50 is guided by the inclined surface 400 of the unlocking portion 40, causing the elastic locking portion 500 of the locking portion 50 to bend and deform radially inward, and the entire locking portion 50 moves radially inward. This releases the lock between the locking portion 50 and the first locking portion 30 (in the syringe 1 of this embodiment, the lock between the locking surface 502 of the locking portion 50 and the first locking surface 300 of the first locking portion 30). That is, the second outer surface 504 functions as a release guide portion that guides the unlocking portion 40 to unlock the locking portion 50.

[0091] When the locking portion 50 is released from the first locking portion 30, the rod side member 5 begins to move toward the base end due to the biasing force of the biasing member 6. When the locking portion 50 moves toward the base end, the first outer surface 503 comes into contact with the first locking surface 300 of the first locking portion 30. The first outer surface 503 is an inclined surface that is positioned radially inward as it approaches the base end, thereby facilitating the retraction of the locking portion 50 radially inward. In other words, the first outer surface 503 functions as a release promoting portion that promotes the release of the locking portion 50 from the first locking portion 30 when the locking of the locking portion 50 is released.

[0092] When the locking portion 50 and the first locking portion 30 are released from the restricted state, the biasing member 6 is released from the first state compression, and moves the rod-side member 5 from the first state toward the second state, thereby attaining the second state (see FIGS. 5A to 5D). At this time, the biasing member 6 is released from the first state compression, and moves the rod-side member 5 from the distal end toward the proximal end relative to the rod 3, thereby attaining the second state. That is, the rod-side member 5 moves to the second state due to the restoring force of the spring, which is the biasing member 6. In the syringe 1 of this embodiment, the movement of the rod-side member 5 stops at a position where the locking portion 50 of the rod-side member 5 locks with the second locking portion 34 (specifically, the second locking surface 340) of the rod 3.

[0093] The second state is an intermediate state in which the next injection of the chemical solution following the initial injection is ready. In the second state, the second pressing portion 52 of the rod side member 5 can be pressed against the rod 3 toward the tip end in the axial direction (see FIGS. 5C and 5D). Also, in this state, the second pressing surface 521 of the second pressing portion 52 is held in a position where it can abut against the second pressed surface 320 of the second pressed portion 32 from the base end side in the axial direction due to the elasticity of the elastic portion 520 of the second pressing portion 52.

[0094] Furthermore, in the second state, the locking portion 50 of the rod-side member 5 can be pressed against the rod 3 toward the base end in the axial direction (see FIGS. 5A and 5B). Also, in this state, the elasticity of the elastic locking portion 500 of the locking portion 50 holds the locking surface 502 of the locking portion 50 at a position where it can abut against the second locking surface 340 of the second locking portion 34 from the tip end in the axial direction.

[0095] When the user of the syringe 1 presses the rod-side member 5 (specifically, the top plate portion 54) toward the distal end from the second state, the second pressing portion 52 of the rod-side member 5 is pressed against the second pressed portion 32 of the rod 3, and the rod 3 is pressed toward the distal end together with the rod-side member 5, resulting in a second spray of the liquid medicine and a completed state (see FIGS. 6A to 6D). Specifically, the second pressing surface 521 of the second pressing portion 52 is pressed against the second pressed surface 320 of the second pressed portion 32.

[0096] Furthermore, in the syringe 1 of this embodiment, in the second state, the third pressing portion 53 of the rod side member 5 is pressed against the third pressed portion 33 of the rod 3. Therefore, when the rod side member 5 is pressed in to push the rod 3 into the barrel 2 in the second state, the second pressing portion 52 of the rod side member 5 presses against the second pressed portion 32, and the third pressing portion 53 presses against the third pressed portion 33, so that the rod 3 moves reliably toward the tip side in the axial direction, allowing the second administration to be performed.

[0097] Furthermore, since the locking portion 50 of the rod side member 5 also serves as the third pressing portion 53, the configuration of the syringe 1 can be simplified.

[0098] Furthermore, during the second spray of the chemical solution, the pressure accumulating portion 411 of the barrel side member 4 and the pressure accumulating protrusion 351 of the rod 3 form a pressure accumulating means (see FIGS. 5A and 5B). Specifically, during the second spray of the chemical solution, when the rod 3 is pushed in together with the rod side member 5, the rod 3 experiences resistance as the base end side pressure accumulating protrusion 351a of the rod 3 overcomes the pressure accumulating portion 411. As a result, during the second spray of the chemical solution, the rod 3 can be biased to a level at which the chemical solution can be discharged in a mist form.

[0099] In this way, by pushing rod 3 toward the distal end to perform the second spray of the liquid medicine, syringe 1 reaches the completed state (see FIGS. 6A to 6D). The second spray of the liquid medicine is completed when piston 37 abuts against inner surface 200 located on the proximal end side of distal end portion 20 of barrel 2.

[0100] According to the syringe 1 described above, in the first state, the first pressing portion 51, which is a separate part from the locking portion 50 of the rod-side member 5, is pressed against the first pressed portion 31 of the rod 3. Therefore, when a user pushes the rod-side member 5 to push the rod 3 into the barrel 2 in the first state, the first pressing portion 51 presses against the first pressed portion 31 of the rod 3, reliably moving the rod 3 toward the distal end in the axial direction, enabling the first administration (the first spray of medicinal solution in the syringe 1 of this embodiment). Furthermore, when the rod 3 is pushed from the first state to a predetermined position relative to the barrel 2, the locking release portion 40 of the barrel-side member 4 releases the lock between the locking portion 50 of the rod-side member 5 and the first locking portion 30 of the rod 3. Then, due to the biasing force of the biasing member 6, the rod-side member 5 moves toward the proximal end in the axial direction, entering the second state. In the second state, the second pressing portion 52, which is a separate part from the engaging portion 50 of the rod side member 5, is pressed against the second pressed portion 32 of the rod 3. Therefore, when the user pushes the rod side member 5 in the second state to push the rod 3 into the barrel 2, the second pressing portion 52 of the rod side member 5 presses against the second pressed portion 32 of the rod 3, causing the rod 3 to move reliably toward the tip in the axial direction, thereby enabling the second administration (in the syringe 1 of this embodiment, the second spray of medicinal liquid).

[0101] In this way, the first pressing portion 51 and the second pressing portion 52, which are separate parts from the locking portion 50 of the rod side member 5, are pressed against the first pressed portion 31 and the second pressed portion 32 of the rod 3, so that the rod 3 can be reliably pressed in during the first and second administrations, and two administrations can be performed reliably.

[0102] The syringe 1 of this embodiment has a structure in which the barrel side member 4 and the rod side member 5 are simply attached to the barrel 2 and the rod 3, thereby simplifying the structure of the syringe 1. Furthermore, the barrel 2 does not need to have a special shape, and the barrel side member 4 of the present application can be applied to barrels 2 of conventionally known shapes.

[0103] Furthermore, in the syringe 1 of this embodiment, in the second state, the pressing surface 521 of the second pressing portion 52 and the second pressed surface 320 of the second pressed portion 32 are pressed against each other by abutting their flat surfaces against each other, and further, the elasticity of the elastic portion 520 holds the flat pressing surface 521 in a position where it can abut against the flat second pressed surface 320 from the base end side in the axial direction, thereby enabling the second pressing portion 52 to be reliably pressed against the second pressed portion 32.

[0104] A container according to a second embodiment of the present invention will be described below with reference to FIGS. 7 and 8. The syringe 1 according to the second embodiment differs from the syringe 1 according to the first embodiment only in the configuration of the locking piece 501 of the locking portion 50 of the rod-side member 5. In addition to a locking surface 502, a first outer surface 503, a second outer surface 504, and a third outer surface 505, the locking piece 501 has a preventing surface 507 that connects the locking surface 502 and the first outer surface 503 and extends along the axial direction. The preventing surface 507 is a surface that rises from the locking surface 502 toward the base end. Therefore, in the locking piece 501 according to the second embodiment, the portion including the locking surface 502 forms a recess surrounded by the locking surface 502, the preventing surface 507, and the elastic locking portion 500.

[0105] In the first state, the tip end of the first locking portion 30 of the rod 3 fits into the recess, and the locking surface 502 abuts against the first locking surface 300 of the first locking portion 30 (see FIG. 7). The preventing surface 507 is disposed in a position where it can abut against the outer surface of the first locking portion 30. Therefore, when the locking portion 50 unintentionally moves radially inward, the preventing surface 507 abuts against the outer surface of the first locking portion 30, thereby restricting the locking portion 50 from moving radially inward, and preventing the locking between the locking portion 50 and the first locking portion 30 from being released.

[0106] When switching from the first state to the second state, the tip of the first locking portion 30 comes out of the recess, and the tapered first outer surface 503 promotes unlocking, similar to the syringe 1 of the first embodiment.

[0107] In the second state, the second locking portion 34 of the rod 3 does not fit into the recess, and therefore the locking surface 502 does not abut against the first locking surface 340 of the second locking portion 34, and in this configuration, the pointed portion 508 formed by the prevention surface 507 and the first locking surface 503 does not abut against the first locking surface 340 (see FIG. 8 ). Note that in the second state, the second locking portion 34 of the rod 3 does not fit into the recess, and therefore the locking surface 502 does not abut against the first locking surface 340 of the second locking portion 34, and the pointed portion 508 formed by the prevention surface 507 and the first locking surface 503 may abut against the first locking surface 340. Also, in a syringe 1 having a locking piece 501 of this shape, the second locking portion 34 may fit into the recess, and the locking surface 502 may abut against the first locking surface 340.

[0108] The syringe of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, or part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, part of the configuration of one embodiment can be deleted.

[0109] For example, the configuration of each member of the syringe 1 may be different from the configuration described above.

[0110] Specifically, the rod side member 5 only needs to have the locking portion 50, the first pressing portion 51, and the second pressing portion 52, and does not necessarily need to have at least one of the third pressing portion 53 and the extension portion 56.

[0111] Furthermore, although the second pressing unit 52 includes the elastic unit 520 and the second pressing surface unit 522, it may have a configuration other than this. For example, the second pressing unit 52 may be configured only with the elastically deformable second pressing surface unit 522.

[0112] The rod 3 only needs to have the first locking portion 30, the first pressed portion 31, and the second pressed portion 32, and does not need to have at least one of the third pressed portion 33 and the second locking portion 34.

[0113] In the syringe 1 of the above embodiment, the first pressed portion 31 is the base end of the rod 3, but is not limited to this configuration. For example, the first pressed portion 31 may have a recess formed from the base end side of the rod 3 toward the tip end in the axial direction of the rod 3, with the bottom surface of this recess serving as the first pressed surface 310, and the first pressing portion 51 of the rod side member 5 inserted into this recess and pressed against the first pressed surface 310.

[0114] Furthermore, in the syringe 1 of the above embodiment, the barrel side member 4 is fitted onto the flange portion 23 of the barrel 2, but it may be attached to the barrel 2 by a method other than fitting. For example, the barrel side member 4 may be attached to the barrel main body 22.

[0115] Furthermore, the barrel side member 4 only needs to include the unlocking portion 40, and does not necessarily have to include the finger hook portion 42, etc. Also, the barrel 2 does not necessarily have to include the flange portion 23.

[0116] Syringe 1 may not have push-in restriction mechanism 8. Syringe 1 may not have spray nozzle 7. In this case, syringe 1 may eject the content (e.g., medicinal liquid) in a line rather than in a mist form from tip 20 of barrel 2. In this case, pressure accumulation protrusion 351 may not be formed on rod 3.

[0117] It should be noted that each functional part of the syringe 1 may have a different shape that has the same function.

[0118] As described above, according to the present invention, it is possible to provide a syringe that can divide the contents and administer two doses, and that can reliably administer two doses.

[0119] The syringe of the present invention is a syringe for administering contents in divided portions, and comprises: a barrel having a tip end and a base end in an axial direction and capable of discharging the contents from the tip end; a rod inserted into the barrel from the base end side in the axial direction and capable of being pushed toward the tip end; a barrel side member attached to the barrel; a rod side member attached to the rod and configured to be movable between a first state in which it is engaged with the rod at a predetermined position in the axial direction, and a second state in which it is positioned on the base end side in the axial direction relative to the first state; and a biasing member engaged with the rod and the rod side member and biasing the rod side member to move from the first state to the second state, wherein the rod side member is axially movable relative to the rod in the first state. a first pressing portion that is a separate portion from the locking portion and that can be pressed against the rod toward the axial tip end in the first state, and a second pressing portion that is a separate portion from the locking portion in the second state, the rod has a first locking portion with which the locking portion locks in the first state, a first pressed portion against which the first pressing portion is pressed in the first state, and a second pressed portion against which the second pressing portion is pressed in the second state, and the barrel side member has an unlocking portion that releases the lock between the locking portion and the first locking portion when the rod is pressed to a predetermined position relative to the barrel in the first state.

[0120] According to this configuration, in the first state, the first pressing portion, which is a separate part from the locking portion, is pressed against the first pressed portion. Therefore, when the rod-side member is pushed to push the rod into the barrel in the first state, the first pressing portion presses against the first pressed portion, reliably moving the rod toward the distal end in the axial direction, allowing the first injection. Furthermore, when the rod is pushed to a predetermined position in the barrel from the first state, the locking release portion releases the lock between the locking portion and the first locking portion. Then, the biasing member biases the rod-side member toward the proximal end in the axial direction, thereby entering the second state. In the second state, the second pressing portion, which is a separate part from the locking portion, is pressed against the second pressed portion. Therefore, when the rod-side member is pushed to push the rod into the barrel in the second state, the second pressing portion presses against the second pressed portion, reliably moving the rod toward the distal end in the axial direction, allowing the second injection. In this way, the first pressing portion and the second pressing portion, which are separate parts from the locking portion of the rod side member, are pressed against the first pressed portion and the second pressed portion of the rod, so that the rod can be reliably pushed in during the first and second administrations, and two administrations can be reliably performed.

[0121] Moreover, in the syringe, the barrel may include a barrel body and a flange portion provided on the barrel body, the barrel side member is attached to the barrel by fitting onto the flange portion, and the rod may include a rod body and a member attachment portion provided on the rod body, and the rod side member may be attached to the member attachment portion.

[0122] This configuration simplifies the syringe structure because the barrel-side member and the rod-side member are simply attached to the barrel and the rod. Furthermore, the barrel does not need to have a special shape, and the configuration can be applied to barrels of known shapes.

[0123] Furthermore, in the syringe, the second pressing portion includes an elastic portion having elasticity in a radial direction perpendicular to the axial direction, and a pressing surface portion provided on the elastic portion, the pressing surface portion having a pressing surface that faces the tip side in the axial direction and is a plane perpendicular to the axial direction, and the second pressed portion includes a pressed surface portion having a pressed surface that faces the base end side in the axial direction and is a plane perpendicular to the axial direction, and in the second state, the pressing surface may be held in a position where it can abut against the pressed surface from the base end side in the axial direction by the elasticity of the elastic portion.

[0124] According to this configuration, in the second state, the flat surfaces are brought into contact with each other and pressed against each other, and furthermore, the elasticity of the elastic portion holds the flat pressing surface in a position where it can abut against the flat pressed surface from the base end side in the axial direction, thereby enabling the second pressing portion to be reliably pressed against the second pressed portion. [Explanation of symbols]

[0125] 1...syringe, 2...barrel, 3...rod, 4...barrel side member, 5...rod side member, 6...biasing member, 7...injection nozzle, 8...push-in restriction mechanism, 20...tip portion, 21...base end portion, 22...barrel main body, 23...flange portion, 30...first locking portion, 31...first pressed portion, 32...second pressed portion, 33...third pressed portion, 34...second locking portion, 35...rod main body, 36...member mounting portion, 37...piston, 40...lock-release portion, 41...barrel mounting portion, 42...finger hook portion, 43...barrel side main body, 44...restriction portion, 50...locking portion, 51...first pressing portion, 52...Second pressing portion, 53...Third pressing portion, 54...Top plate portion, 55...Skirt portion, 56...Extending portion, 57...Abutment portion, 100...Nasal administration container, 101...Barrel, 102...Plunger, 103...Plunger rod, 105...Elastic member, 200...Inner surface, 220...Main body tip portion, 221...Main body base end portion, 222...Main body connection portion, 300...First engaging surface, 301...First through hole, 310...First pressed surface, 320...Second pressed surface (pressed surface), 321...Second pressed surface portion (pressed surface portion), 330...Third pressed surface, 340...Second engaging surface, 341 ...second through hole, 350...shaft portion, 351...pressure accumulating protrusion, 351a...base end side pressure accumulating protrusion, 351b...tip side pressure accumulating protrusion, 360...widened portion, 361...insertion hole, 370...tip surface, 340...second locking surface, 400...inclined surface, 410...mounting portion through hole, 411...pressure accumulating portion, 440...regulating surface, 500...locking elastic portion, 501...locking piece, 502...locking surface, 503...first outer surface, 504...second outer surface, 505...third outer surface, 506...outer surface, 507...preventing surface, 508...pointed portion, 510...extending portion, 511...first pressing surface, 512...first pressing surface portion , 520...elastic portion, 521...second pressing surface (pressing surface), 522...second pressing surface portion (pressing surface portion), 523...inner peripheral surface, 524...base end side inner peripheral surface, 525...connecting inner peripheral surface, 530...third pressing surface, 540...outer peripheral portion, 570...contact surface, 1016...protrusion, 1016a...protrusion, 1020b...other end, 1026...first elongated hole portion, 1028...second elongated hole portion, 1030b...other end, 1030L...plate spring portion, 1034...pressing portion, 1034a...surface, 1036...first locking portion, 1036a...front end portion, 1038...second locking portion, AR2, AR4...arrows

Claims

1. A syringe for administering contents in divided doses, a barrel having a tip end and a base end in an axial direction, the barrel being capable of discharging contents from the tip end; a rod that is inserted into the barrel from a base end side in the axial direction and can be pushed toward a tip end side; a barrel side member attached to the barrel; a rod side member attached to the rod and configured to be movable between a first state in which the rod side member is engaged at a predetermined axial position with respect to the rod, and a second state in which the rod side member is positioned on the base end side in the axial direction relative to the first state; a biasing member that is engaged with the rod and the rod side member and biases the rod side member to move from the first state toward the second state, The rod side member includes a locking portion that locks onto the rod in the axial direction in the first state, a first pressing portion that can be pressed against the rod toward the axial tip side in the first state and is a portion separate from the locking portion, and a second pressing portion that can be pressed against the rod toward the axial tip side in the second state and is a portion separate from the locking portion, the rod includes a first locking portion with which the locking portion locks in the first state, a first pressed portion against which the first pressing portion is pressed in the first state, and a second pressed portion against which the second pressing portion is pressed in the second state, the barrel side member includes an unlocking portion that unlocks the locking portion and the first locking portion when the rod is pushed into the barrel to a predetermined position in the first state, The rod side member includes a top plate portion and a skirt portion extending from the top plate portion toward the tip side, The locking portion extends from a portion inside the outer periphery of the top plate portion toward the tip end, The second pressing portion extends from the skirt portion toward the tip side of the syringe.

2. The barrel includes a barrel body and a flange portion provided on the barrel body, the barrel side member is attached to the barrel by fitting onto the flange portion, The rod includes a rod body and a member attachment portion provided on the rod body, The syringe according to claim 1 , wherein the rod-side member is attached to the member attachment portion.

3. A syringe for administering divided contents, a barrel having a tip end and a base end in an axial direction, the barrel being capable of discharging contents from the tip end; a rod that is inserted into the barrel from a base end side in the axial direction and can be pushed toward a tip end side; a barrel side member attached to the barrel; a rod side member attached to the rod and configured to be movable between a first state in which the rod side member is engaged at a predetermined axial position with respect to the rod, and a second state in which the rod side member is positioned on the base end side in the axial direction relative to the first state; a biasing member that is engaged with the rod and the rod side member and biases the rod side member to move from the first state toward the second state, The rod side member includes a locking portion that locks onto the rod in the axial direction in the first state, a first pressing portion that can be pressed against the rod toward the axial tip side in the first state and is a portion separate from the locking portion, and a second pressing portion that can be pressed against the rod toward the axial tip side in the second state and is a portion separate from the locking portion, the rod includes a first locking portion with which the locking portion locks in the first state, a first pressed portion against which the first pressing portion is pressed in the first state, and a second pressed portion against which the second pressing portion is pressed in the second state, the barrel side member includes an unlocking portion that unlocks the locking portion and the first locking portion when the rod is pushed into the barrel to a predetermined position in the first state, The second pressing portion includes an elastic portion having elasticity in a radial direction perpendicular to the axial direction, and a pressing surface portion provided on the elastic portion, the pressing surface portion having a pressing surface that faces a tip side in the axial direction and is a plane perpendicular to the axial direction, The second pressed portion includes a pressed surface portion having a pressed surface that faces the base end side in the axial direction and is a flat surface perpendicular to the axial direction, In the second state, the pressing surface is held at a position where it can abut against the pressed surface from the base end side in the axial direction due to the elasticity of the elastic portion.

Images