JP7742636B2 - Syringe - Google Patents

Description

The present invention relates to a syringe that can administer a medicinal liquid filled inside into the nostrils or oral cavity.

Conventionally, syringe-type ejection containers capable of ejecting divided doses of medicinal liquid into each nostril have been known as containers for administering divided doses of medicinal liquid into the patient's nostrils and oral cavity (Patent Document 1). As shown in Figure 14, syringe-type ejection container 10 comprises an ejection part 120 filled with the contents, a syringe 130 that holds ejection part 120, and a plunger 150 that can be inserted into syringe 130.

The ejection section 120 has a cylindrical pipe member 121. Inside the pipe member 121, a piston 125 is provided that is slidable and in liquid-tight contact with the inner surface of the pipe member 121.

As shown in FIG. 15 , the syringe 130 has a cylindrical body 131, a tip tube portion 132 located at the tip end of the body 131, and a finger hook portion 134 located at the rear end of the body 131. As shown in FIG. 16 , the inner surface of the body 131 is provided with a groove-shaped inward guide portion 135 extending along the axis M, a groove-shaped introduction path 136 also extending along the axis M, and a guide path 137 connected to the tip end of the introduction path 136. Furthermore, as shown in FIG. 18 , a convex portion 136a protruding radially inward from the inner surface of the body 131 is provided at the connection between the introduction path 136 and the guide path 137. The introduction path 136 and the guide path 137 guide the protrusion 154 (described below) of the plunger 150 when the plunger 150 is inserted into the syringe 130 and pushed toward the tip end.

The guide path 137 includes a first pressing path 138 that extends from the rear end of the syringe 130 toward the tip end while inclining in a direction that circles around the axis M (counterclockwise from the rear end toward the tip end of the axis M), a detour path 139 that connects to the first pressing path 138 and extends in a direction that is opposite to the inclination of the first pressing path 138 with respect to the axis M (clockwise), and a second pressing path 140 that connects to the detour path 139 and extends toward the tip end of the syringe 130 in a direction along the axis M.

The first pressing path 138 has a first pressing path starting portion 138a extending from its starting end Ka, and a first pressing path ending portion 138b continuing from the first pressing path starting portion 138a and extending to its ending end Kb. The detour path 139 has a detour path starting portion 139a extending from its starting end Kb, and a detour path ending portion 139b continuing from the detour path starting portion 139a and extending to its ending end Kc. The second pressing path 140 has a second pressing path starting portion 140a extending from its starting end Kc, and a second pressing path ending portion 140b continuing from the second pressing path starting portion 140a and extending to its ending end Kd.

As shown in FIG. 17 , the plunger 150 has a tip shaft 151, an elastic portion 153 connected to the tip shaft 151, a protrusion 154 provided on the outer peripheral surface of the elastic portion 153 and projecting radially outward, a connecting portion 155 connected to the elastic portion 153, and a base portion 156 connected to the connecting portion 155. The plunger 150 also has an outward guide portion 157 provided on the outer peripheral surface of the base portion 156 and extending along the axis M of the plunger 150, and an operating portion 158 connected to the rear end of the base portion 156.

When spraying the content liquid F from the syringe-type spray container 10, first, the protrusion 154 and outward guide portion 157 of the plunger 150 are aligned with the introduction path 136 and inward guide portion 135 of the syringe 130. The plunger 150 is then inserted from the rear end side of the syringe 130 and moved until the protrusion 154 clears the convex portion 136a. Next, the pipe member 121 is inserted into the tip tube portion 132 and rotated, holding the spray portion 120 at the tip side of the syringe 130. The plunger 150 is then pressed toward the tip side to perform the first spray.

During the first ejection, when the protrusion 154 is guided into the first pressure path 138, the piston 125, which is pushed in by the pressure of the plunger 150, moves while encountering sliding resistance between the piston 125 and the inner surface of the pipe member 121, as well as flow resistance as the content liquid F flows. This resistance applies a pressing force to the elastic portion 153, causing the elastic portion 153 to deform as shown in FIG. 19, and pushing the protrusion 154 radially outward. The first pressure path 138 also has a first pressure path start portion 138a formed by a groove and a first pressure path end portion 138b formed by a hole. As a result, when the protrusion 154 passes through the first pressure path start portion 138a, it abuts against the inner surface of the groove, creating resistance, whereas when it passes through the first pressure path end portion 138b, this resistance is eliminated. As a result, the plunger 150 moves slowly for a while immediately after the application of the pressing force, and then moves rapidly, causing the content liquid F to spray out as if it had been instantly released from a pressure-accumulated state.

Furthermore, while the protrusion 154 is guided along the first pressing path 138, the base portion 156 of the plunger 150 is held against rotation by the inward guide portion 135, which is aligned with the outward guide portion 157. Therefore, a twisting force is applied between the elastic portion 153 and the base portion 156 in a direction orbiting the axis M, causing the connecting portion 155 to become twisted. When the protrusion 154 reaches the end Kb of the first pressing path 138 (the start end Kb of the detour path 139), the detour path 139 provides a counter-torsion action on the connecting portion 155, moving the protrusion 154 toward the end Kc of the detour path 139 and returning the protrusion 154 to its radially inward position. This restores the twist in the connecting portion 155, and the protrusion 154 automatically moves to the end Kc of the detour path 139.

Then, by pressing the operating part 158 again, the plunger 150 is pushed in (the protrusion 154 moves from the start end Kc to the end end Kd of the second pressing path 140), allowing a second injection to be performed.

Patent No. 6275497

In the syringe-type ejection container 10 described above, when the plunger 150 is pushed in, the elastic portion 153 of the plunger 150 is deformed and restored by the twisting force during the first administration, but the elastic portion 153 is not subjected to the twisting force during the second administration. As a result, the feel of operating the plunger 150 differs between the first and second administrations, making stable ejection difficult.

The objective of the present invention is to provide a syringe that can divide the contents and administer multiple doses, and that allows administration with a stable feel when used.

The syringe of the present invention is a syringe for administering divided contents, 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 in the axial direction and capable of being pushed toward the tip end; a base end attached to the barrel; a body end rotatable relative to the base end and the rod; a biasing means including a base-side biasing engagement portion of the base end and a body-side biasing engagement portion of the body end, which biases the body end to rotate by engagement of the base-side biasing engagement portion and the body-side biasing engagement portion; and a push control mechanism having a push guide portion on one side of the rod and the body end and a pushed guided portion guided by the push guide portion on the other side of the rod and the body end, and the rod is inserted from the tip end to the base end. The push guide portion is a single rigid body extending from the push receiving portion to the push receiving portion, and the push guide portion has a first pushable portion that guides the push receiving portion to allow the rod to be pushed in, a second pushable portion that is located on the tip side of the first pushable portion and guides the push receiving portion to allow the rod to be pushed in, and a push restricting portion that is located between the first pushable portion and the second pushable portion and engages with the push receiving portion to restrict the pushing of the rod, the first pushable portion has a rotation restricting portion that restricts the rotation of the body portion due to the biasing means, and a rotation allowing portion that allows the body portion to rotate due to the biasing means is connected to the push restricting portion, and the push restriction by the push restricting portion is released when the body portion rotates in the rotation allowing portion due to the biasing means.

With this configuration, the rod moves axially as a single rigid body, and the biasing means and push-in control mechanism allow the rod to be pushed into the first push-in permission section (first push-in) and the second push-in permission section (second push-in) separately. Therefore, the feel of operating the rod during the first push-in and the second push-in feel the same, allowing for stable dispensing of the contents.

In addition, in the syringe, the base portion has a rotation restriction portion that restricts rotation around the axis of the rod inserted into the barrel.

This configuration restricts the rotation of the rod, ensuring that the rod feels the same when pressed in the first direction as when pressed in the second direction.

In addition, in the syringe, at least one of the base-side biasing engagement portion and the body-side biasing engagement portion has a base portion extending radially and an elastic portion extending circumferentially from the tip of the base and elastically deformable in the radial direction, and the biasing means biases the body portion in the rotational direction by elastic deformation of the elastic portion.

With this configuration, the biasing means biases the body portion in the rotation direction by utilizing the elastic deformation of the elastic portion in the radial or circumferential direction, allowing for smooth rotation.

As described above, the present invention provides a syringe that can divide the contents and administer multiple doses, and that allows administration with a stable feel when operated.

FIG. 1 is a front view of a syringe according to this embodiment in an initial state. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 2 is a cross-sectional view taken along the line III-III in FIG. FIG. 4 is an exploded view of the syringe. FIG. 5A is an enlarged front view of a main part of the syringe in a restricted state. FIG. 5B is a cross-sectional view taken along the line VB-VB in FIG. 5A. FIG. 6A is an enlarged view of a main part of the front view of the syringe in the released state. FIG. 6B is a cross-sectional view taken along the line VIB-VIB in FIG. 6A. FIG. 7 is a front view of the syringe in a completed state. FIG. 8A is an enlarged view of a main part of a front view of another syringe according to this embodiment. FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. 8A. FIG. 9 is a cross-sectional view taken along the line IX-IX in FIG. 8A. FIG. 10 is an exploded view of the syringe. FIG. 11A is an enlarged front view of a main part of the syringe in a restricted state. FIG. 11B is a cross-sectional view taken along the line XIB-XIB in FIG. 11A. FIG. 12A is an enlarged view of a main part of the front view of the syringe in the released state. FIG. 12B is a cross-sectional view taken along the line XIIB-XIIB in FIG. 12A. FIG. 13A is an enlarged view of a main part of the front view of the syringe in a completed state. FIG. 13B is a cross-sectional view taken along line XIIIB-XIIIB in FIG. 13A. FIG. 14 is a half cross-sectional view and a partially enlarged view of a conventional jetting container as seen from the front. FIG. 15 is a front view and a bottom view of the syringe. FIG. 16 is a vertical cross-sectional view of the syringe. FIG. 17 is a cross-sectional view of the syringe. FIG. 18 is an enlarged view showing the guide path of the syringe. FIG. 19 is a side view showing deformation of the elastic portion relative to the plunger in the syringe.

The container according to an embodiment of the present invention will be described below with reference to Figures 1 to 7.

As shown in Figures 1 and 2, syringe 1 is a syringe for administering divided doses of its contents. Specifically, syringe 1 is a nasal administration container that can administer divided doses of mist-like liquid medicine into both nostrils. Syringe 1 administers the liquid medicine in two doses, but it may also administer the liquid medicine in three or more doses. The liquid medicine is a liquid medicine, such as an influenza vaccine. Syringe 1 is approximately cylindrical in shape.

The syringe 1 also includes a barrel 2 having an axial tip 20 and a base 21 and capable of discharging the contents from the tip 20, a rod 3 that is inserted into the barrel 2 from the base end and can be pushed toward the tip, and a base 4 that is attached to the barrel 2. The syringe 1 also includes a body 5 that is rotatable relative to the base 4 and the rod 3, and a biasing means 6 that includes a base-side biasing engagement portion 40 of the base 4 and a body-side biasing engagement portion 50 of the body 5, and biases the body 5 to rotate by engagement of the base-side biasing engagement portion 40 and the body-side biasing engagement portion 50.

The syringe 1 includes a push control mechanism 7 having a push guide portion 70 on one of the rod 3 and the body portion 5, and a pushed guided portion 71 guided by the push guide portion 70 on the other of the rod 3 and the body portion 5. In the syringe 1 of this embodiment, the body portion 5 has the push guide portion 70, and the rod 3 has the pushed guided portion 71 guided by the push guide portion 70. The syringe 1 also includes a rotation control mechanism 8 composed of the push guide portion 70 and the pushed guided portion 71. The syringe 1 of this embodiment also includes an injection nozzle 9.

In the syringe 1, the side where the tip end 20 of the barrel 2 is located (the lower side in Figures 1, 2, 5A, 6A, and 7) is the "tip side," and the side where the base end 21 of the barrel 2 is located (the upper side in Figures 1, 2, 5A, 6A, and 7) is the "base side." Furthermore, the "axial direction" of the syringe 1 is the cylindrical axis direction of the syringe 1. Furthermore, the radial direction of the syringe 1 is also simply referred to as the "radial direction."

When using the syringe 1, the rod 3 is pushed from the initial state in which it is raised to the base end (see Figure 1) toward the tip end to spray the first liquid, and then a restricted state is established in which further pushing of the rod 3 is restricted (see Figure 5A). Next, after passing through a released state in which the biasing force applied by the biasing means 6 for rotating the body portion 5 is released (see Figure 6A), the rod 3 is further pushed in to spray the second liquid, and the process is completed (see Figure 7).

The following describes each component of the syringe 1 in detail.

The barrel 2 is a component that contains a medicinal liquid (see Figure 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.

The barrel body 22 is a cylindrical portion. In this barrel 2, the body tip portion 220, which is the tip end of the barrel body 22, constitutes the tip portion 20 of the barrel 2, and the body base portion 221, which is the base end of the barrel body 22, constitutes the base portion 21 of the barrel 2. In addition to the body tip portion 220 and the body base portion 221, the barrel body 22 is equipped with a cylindrical body connecting portion 222 that connects the body tip portion 220 and the body base portion 221.

The flange portion 23 extends outward (in the radially outward direction of the barrel body 22) from, for example, the entire outer periphery of one end of the base end portion 21 in the axial direction. In other words, the flange portion 23 has an annular (e.g., circular) shape when viewed in the axial direction.

The outer diameter of the main body tip portion 220 is smaller than the outer diameter of the main body connecting portion 222. Furthermore, the outer diameter of the main body connecting portion 222 is substantially the same at any point in the axial direction.

Barrel 2 is formed, for example, from a transparent material that can withstand the internal pressure exerted when administering the medicinal solution. Specifically, barrel 2 is made of a material such as glass or a resin that simply contains repeated units of a cyclic olefin such as norbornene. More specifically, barrel 2 is made of a transparent resin such as COP (cycloolefin polymer), which is a homopolymer of a cyclic olefin, or COC (cycloolefin copolymer), which is a copolymer of a cyclic olefin and ethylene, or glass.

The rod 3 is a member that moves when the contents of the barrel 2 are dispensed. It is a single rigid body from the tip to the base. In other words, the rod 3 is a rod-shaped body that is configured so that it is substantially free from deformation, such as expansion and contraction in the longitudinal direction or twisting around the longitudinal direction, due to external forces received from the tip to the base, such as pushing operations, and is a single rod-shaped body that is formed continuously and integrally from the tip to the base. The rod 3 is operated by a doctor, nurse, etc., but may also be operated by the patient.

In addition to the pushed-in guide portion 71, the rod 3 also has a shaft portion 30, an operating portion 31 provided at one end of the shaft portion 30 in the longitudinal direction, and multiple (e.g., four) pressure-accumulating protrusions 32 protruding from the shaft portion 30 in the outer diameter direction of the rod 3. The rod 3 also has a piston 33 provided at the tip end of the shaft portion 30 in the longitudinal direction. The rod 3 is inserted into the barrel 2 with the operating portion 31 located at the base end and the piston 33 located at the tip end.

In this rod 3, the operating portion 31, shaft portion 30, and piston 33 are continuous in the axial direction from the base end to the tip end. Furthermore, in this rod 3, the operating portion 31 and shaft portion 30 are molded as a single unit, but the piston 33 is a separate component formed by connecting these components. It is also possible for at least two of the shaft portion 30, operating portion 31, and piston 33 to be formed as a single unit, or for all of them to be connected as separate components.

The cross-sectional shape of the shaft portion 30 in a direction perpendicular to the longitudinal direction is, for example, a cross shape, as shown in Figure 3. However, this cross-sectional shape of the shaft portion 30 may also be other shapes (circular, rectangular, etc.).

The push-in guide portion 71 is, for example, a protrusion (see Figure 1). This push-in guide portion 71 is a protrusion that protrudes from the shaft portion 30 in the outer diameter direction of the rod 3. In the syringe 1 of this embodiment, for example, multiple push-in guide portions 71 (specifically, two) are provided (see Figure 2).

The pressure accumulator ridge 32 includes, for example, one base-end pressure accumulator ridge 320 arranged on the base end side and one tip-end pressure accumulator ridge 321 arranged on the tip end side. The base-end pressure accumulator ridge 320 is provided continuously around the entire circumference of the shaft portion 30. The same applies to the tip-end pressure accumulator ridge 321.

It should be noted that multiple base-end pressure accumulator protrusions 320 may be arranged, and in this case, the multiple base-end pressure accumulator protrusions 320 may be arranged at equal intervals in the circumferential direction of the rod 3. The same applies to the tip-end pressure accumulator protrusions 321.

The piston 33 is a member that can abut against the inner surface located on the base end side of the tip portion 20 of the barrel 2. The piston 33 also makes close contact with the entire inner circumferential surface of the main body connection portion 222 of the barrel 2. In this embodiment, the tip surface of the piston 33 abuts against the inner surface of the tip portion 20 of the barrel 2 when administration of the medicinal liquid is completed (specifically, after the second ejection of the medicinal liquid).

The base portion 4 functions, for example, as a finger grip on which the user places their finger (see Figure 1). As shown in Figure 4, in addition to the base-side biasing engagement portion 40, the base portion 4 has a first cylindrical portion 41, a second cylindrical portion 42 located closer to the tip than the first cylindrical portion 41, a finger hook portion 43 located closer to the tip than the second cylindrical portion 42, and an extension portion 44 located closer to the tip than the finger hook portion 43. The base portion 4 is made of, for example, polypropylene.

The first cylindrical portion 41 is cylindrical. The outer peripheral surface 410 of the first cylindrical portion 41 is provided with a base-side biasing engagement portion 40. The first cylindrical portion 41 also has a cylindrical shape, and its interior defines a rod insertion hole 411 through which the rod 3 is inserted.

The second cylindrical portion 42 is, for example, cylindrical with a larger outer diameter than the first cylindrical portion 41. When viewed in the axial direction, the finger hook portion 43 extends radially outward beyond the second cylindrical portion 42. The body portion 5 is rotatably engaged with the second cylindrical portion 42.

The extension portion 44 is a portion that engages with the barrel 2. The extension portion 44 has a structure that allows it to hook onto, for example, the flange portion 23 of the barrel 2. For example, multiple extension portions 44 (e.g., four) are provided. In the syringe 1 of this embodiment, the multiple extension portions 44 are provided at equal intervals around the circumference of the second cylindrical portion 42.

The base-side biasing engagement portion 40 is, for example, located radially inward of the body-side biasing engagement portion 50 (see FIG. 3). The base-side biasing engagement portion 40 also extends radially outward from the outer peripheral surface 410 of the first cylindrical portion 41. In the syringe 1 of this embodiment, the base-side biasing engagement portion 40 has a base portion 400 extending radially, and an elastic portion 401 extending circumferentially from the tip of the base portion 400 and elastically deformable radially.

In this syringe 1, the base-side biasing engagement portion 40 is arranged radially outward of the rod insertion hole 411 of the first cylindrical portion 41. Furthermore, multiple base-side biasing engagement portions 40 are provided at intervals in the circumferential direction. The base-side biasing engagement portions 40 are arranged around the rod insertion hole 411 (rotation restriction portion).

A pair of bases 400 are provided, sandwiching the cylindrical axis. Specifically, the pair of bases 400 are arranged on opposite sides, 180° apart, with the cylindrical axis in between.

The elastic portions 401 are elastically deformable, for example, bending radially inward. Each elastic portion 401 extends from each base portion 400. The thickness of the elastic portion 401 (the dimension in the direction perpendicular to the direction in which the elastic portion 401 extends) is greater at the tip portion 402, so that the portion thinner than the tip portion 402 (the base portion 400 side) is more susceptible to elastic deformation.

The body portion 5 is a cylindrical member (see Figure 4). In addition to the body-side biasing engagement portion 50, the body portion 5 has, for example, a main body cylindrical portion 51, a base-end body cylindrical portion 52 located closer to the base end than the main body cylindrical portion 51, a tip-end body cylindrical portion 53 located closer to the tip end than the main body cylindrical portion 51, and a top plate portion 54 located closer to the base end of the base-end body cylindrical portion 52. The body portion 5 is made of polypropylene or polycarbonate.

The main body tubular portion 51 is cylindrical. Furthermore, the main body tubular portion 51 is positioned radially outside the first tubular portion 41 of the base portion 4, and is fitted onto the first tubular portion 41, for example.

The body base end side tubular portion 52 is, for example, cylindrical and has a larger outer diameter than the main body tubular portion 51. Furthermore, the body base end side tubular portion 52 is positioned radially outward of the rod 3.

The body tip-side tubular portion 53 is, for example, cylindrical and has a larger outer diameter than the body base-side tubular portion 52. The body tip-side tubular portion 53 is positioned radially outside the second tubular portion 42 of the base portion 4, and is fitted onto the second tubular portion 42, for example. In the syringe 1 of this embodiment 1, the body tip-side tubular portion 53 engages with the second tubular portion 42 of the base portion 4, thereby allowing the body portion 5 to be rotatably attached to the base portion 4.

The top plate portion 54 is, for example, a disk-shaped portion provided with a through-hole through which the rod 3 is inserted. The top plate portion 54 also has a pressure accumulator portion 540 that extends radially inward and can engage with the pressure accumulator protrusion 32 (see Figure 2).

The body-side biasing engagement portions 50 are ribs consisting of inclined surfaces that intersect in the radial direction and are provided on the inner peripheral surface of the main body tubular portion 51 (see Figure 3). The body-side biasing engagement portions 50 are also arranged around the rod insertion hole 411. A pair of body-side biasing engagement portions 50 (e.g., ribs) are provided on either side of the cylindrical axis of the main body tubular portion 51. Specifically, the pair of body-side biasing engagement portions 50 are arranged on opposite sides 180° apart across the cylindrical axis.

As described above, the biasing means 6 includes the base-side biasing engagement portion 40 of the base portion 4 and the body-side biasing engagement portion 50 of the body portion 5, and engagement between these biasing engagement portions 40, 50 biases the body portion 5 to rotate relative to the base portion 4. Furthermore, in the syringe 1 of this embodiment, the biasing means 6 biases the body portion 5 in a rotational direction (e.g., counterclockwise) by elastic deformation of the elastic portion 401, as shown in FIG. 5B.

In the syringe 1 of this embodiment, the push-in guide portion 70 is provided on the main body tubular portion 51 (see FIG. 1). The push-in guide portion 70 is, for example, a groove, and more specifically, a groove formed in the main body tubular portion 51. This groove penetrates the main body tubular portion 51 in the thickness direction.

The pushing guide portion 70 has a first pushing portion 701 that guides the pushed guided portion 71 to allow the rod 3 to be pushed in, and a second pushing portion 702 that is located at the tip side of the first pushing portion 701 and guides the pushed guided portion 71 to allow the rod 3 to be pushed in. The pushing guide portion 70 also has a pushing restriction portion 703 that is located between the first pushing portion 701 and the second pushing portion 702 and engages with the pushed guided portion 71 to restrict the pushing of the rod 3.

In the syringe 1 of this embodiment, the number of push-in guide portions 70 is the same as the number of push-in guided portions 71. In this syringe 1, for example, multiple push-in guide portions 70 (specifically, two) are provided.

The first push-in portion 701 has a rotation restriction portion 704 that restricts the rotation of the body portion 5 due to the biasing force of the biasing means 6. The first push-in portion 701 also allows pushing only by an amount corresponding to the first half of the pushing stroke of the rod 3. The first push-in portion 701 is an inclined groove that extends in a direction intersecting the axis of the cylindrical shaft so that the terminal end, which is the tip end, is circumferentially offset from the starting end, which is the base end.

In this syringe 1, as the push-in guide portion 71 (protrusion) moves from the start end to the end end of the first push-in allowing portion 701, the body portion 5 rotates relative to the base portion 4, and the body-side biasing engagement portion 50 presses the base-side biasing engagement portion 40, causing it to elastically deform. This causes the elastic portion 401 to elastically deform, and a biasing force is accumulated in the biasing means 6. In other words, the first push-in allowing portion 701 functions as a biasing force accumulation portion that accumulates a biasing force that rotates the body portion 5 in the biasing means 6.

The rotation restriction portion 704 extends, for example, in the axial direction. The rotation restriction portion 704 also serves as a biasing force retaining portion 811, for example, to retain the biasing force accumulated in the biasing means 6 so that it is not released.

The push-in restricting portion 703 is a portion provided at the end of the first push-in allowing portion, and is the portion against which the protrusion 71 abuts from the base end side. Specifically, the push-in restricting portion 703 is the push-in restricting surface 7030 described below. In this embodiment, the push-in restricting portion 703 is the push-in restricting surface 7030, which is a flat surface extending horizontally.

Connected to the push-in restricting portion 703 is a rotation allowing portion 705 that allows the body portion 5 to rotate when biased by the biasing means 6. The push-in restricting portion 703 is configured so that when the body portion 5 rotates when biased by the biasing means 6, the push-in restricting portion 703's rotation allowing portion 705 releases the push-in restriction (restriction of the rod 3 from being pushed in by the engagement between the push-in restricting portion 703 and the pushed-in guide portion 71).

The rotational movement permitting portion 705 is configured to be continuous with the pushing restriction portion 703 and is an opening in the circumferential direction of the pushing restriction portion 703. In this embodiment, this opening is formed in the boundary region between the pushing restriction portion 703 and the second pushing restriction portion 702, and connects the start end of the second pushing restriction portion 702 to the pushing restriction portion 703. In other words, the rotational movement permitting portion 705 is an opening between the pushing restriction portion 703 and the start end of the second pushing restriction portion 702. In other words, the rotational movement permitting portion 705 is an opening (groove) that connects to the pushing restriction portion 703 and the start end of the second pushing restriction portion 702. The rotational movement permitting portion 705 is, for example, a straight (approximately linear) groove.

The starting end of the rotational movement portion 705 is continuous with the ending end of the first push-in portion 701, and the ending end of the rotational movement portion 705 is continuous with the starting end of the second push-in portion 702. Specifically, the starting end of the rotational movement portion 705 has no surface on the base end side and is connected to the ending end of the first push-in portion 701, and has a surface on the tip end side (e.g., push-in restriction surface 7030). The ending end of the rotational movement portion 705 has a surface on the base end side and is no surface on the tip end side and is connected to the starting end of the second push-in portion 702.

At the beginning of the rotation allowance portion 705, the pushing of the rod 3 is restricted. At the end of the rotation allowance portion 705, the pushing of the rod 3 is released.

When the pushed-in guide portion 71 is positioned in the rotation-permitting portion 705, the biasing force of the biasing means 6 is released. Specifically, when the pushed-in guide portion 71 (e.g., the protrusion of the rod 3) is located at the beginning of the rotation-permitting portion 705, a biasing force is accumulated in the biasing means 6, and the restriction on the biasing force can be released. When it is located at the end of the rotation-permitting portion 705, the rotation of the body portion 5 is complete, and no biasing force from the biasing means 6 remains.

Between the start and end of the rotation permitting section 705, rotation of the body section 5 relative to the base section 4 (rod 3) is permitted. At the start of the rotation permitting section 705, the restriction on this rotation is released, allowing rotation. At the end of the rotation permitting section 705, the rotation of the body section 5 relative to the base section 4 (rod 3) due to the biasing force is completed, and no biasing force remains in the biasing means 6.

Furthermore, in the syringe 1 of this embodiment, the pushing guide portion 70 has a first rotation restricting portion 81 that guides the pushed guide portion 71 to restrict the rotation of the body portion 5, and a second rotation restricting portion 82 that is disposed on the tip side of the first rotation restricting portion 81 and guides the pushed guide portion 71 to restrict the rotation of the body portion 5. In addition, in this syringe 1, a rotation allowing portion 705 is disposed between the first rotation restricting portion 81 and the second rotation restricting portion 82.

The first rotation restricting portion 81 has a biasing force accumulation portion 810, which is a portion that extends at an angle relative to the axial direction, and a biasing force retention portion 811, which is a portion that extends in the axial direction. The biasing force accumulation portion 810 extends, for example, in a direction that is inclined in the direction opposite to the rotation direction of the body portion 5 (specifically, counterclockwise) relative to the axial direction, i.e., diagonally downward to the right. With this configuration, the biasing force of the biasing means 6 is accumulated when the pushed-in guide portion 71 is guided through the biasing force accumulation portion 810, so there is no need to apply bias during assembly (initial state).

When the rod 3 begins to be initially pushed, the pushed-in guide portion 71 moves against the bias accumulation portion 810, causing the body portion 5 to rotate relative to the base portion 4. Specifically, the base-side bias engagement portion 40 and the body-side bias engagement portion 50 engage, causing the body portion 5 to rotate in a direction that increases the elastic deformation of the elastic portion 401. As a result, an elastic force accumulates in the elastic portion 401, and a bias for rotating the body portion 5 is accumulated in the biasing means 6.

The first rotation restricting portion 81 may be formed only with the biasing force accumulation portion 810 without the biasing force holding portion 811. The first rotation restricting portion 81 may also be formed only with the biasing force holding portion 811 without the biasing force accumulation portion 810. When the first rotation restricting portion 81 is formed only with the biasing force holding portion 811, it is sufficient to accumulate bias in the biasing means 6 in advance when assembling the syringe 1 (initial state).

The second push-in portion 702 extends in the axial direction. The second push-in portion 702 also serves as, for example, the second rotation restriction portion 82.

In the syringe 1 of this embodiment, the axial dimensions of the first push-in portion 701 and the second push-in portion 702 are approximately the same. This allows for uniform injection amounts during the first and second administrations.

The spray nozzle 9 is the part that extracts the medicinal liquid. In this embodiment, the spray nozzle 9 is configured to spray the medicinal liquid in a mist form.

The following provides a detailed explanation of the operations and various states when using syringe 1.

The initial state is a state in which the medicinal liquid has not yet been sprayed (see Figures 1 and 2). At this time, the pushed-in guide portion 71 is located at the initial position, which is the beginning of the first push-in allowance portion 701 of the push-in guide portion 70. In the syringe 1 of this embodiment, the initial position is also the beginning of the first rotation restriction portion 81 of the rotation control mechanism 8.

When a user of the syringe 1 pushes the rod 3 (specifically, the operating portion 31) toward the tip from the initial state, the rod 3 moves toward the tip, and the pushable guide portion 71, which is located in the initial position, moves toward the tip while being guided by the first pushable portion 701 until it reaches the restricting position, which is the tip end of the first pushable portion 701, and the initial spray of medicinal liquid is performed, resulting in a restricted state (see FIG. 5A). At this time, the pushable guide portion 71 is pressed against the pushable restricting surface 7030, which is the pushable restricting portion 703. The engagement between the pushable guide portion 71 and the pushable restricting surface 7030 restricts the pushing of the rod 3 (movement toward the tip).

In the syringe 1 of this embodiment, when the initial pushing of the rod 3 begins, the pushed-in guide portion 71 moves toward the tip while being guided by the first rotation restricting portion 81, and reaches a restricting position, which is also the starting point of the first rotation restricting portion 81, thereby entering a restricted state. Specifically, while the pushed-in guide portion 71 moves toward the tip while being guided by the bias accumulation portion 810, the body portion 5 is permitted to rotate clockwise relative to the base portion 4 in the direction in which bias accumulates (the direction in which it moves from FIG. 3 to FIG. 5B ), but is restricted from rotating in the direction in which the body portion 5 rotates relative to the base portion 4 due to the bias (e.g., counterclockwise). Furthermore, while the body portion 5 moves toward the tip while being guided by the bias holding portion 811, the body portion 5 remains biased in the direction in which the body portion rotates relative to the base portion 4 due to the bias (e.g., counterclockwise) (see FIG. 5B ).

In the syringe 1 of this embodiment, during the initial spray of medicinal liquid, the pressure accumulator 540 of the body 5 and the pressure accumulator protrusion 32 of the rod 3 form the pressure accumulator (see Figure 2). Specifically, during the initial spray of medicinal liquid, when the rod 3 is pushed in, resistance is felt as the distal pressure accumulator protrusion 321 of the rod 3 overcomes the pressure accumulator 540. This allows the rod 3 to be biased to a level at which the medicinal liquid can be ejected as a mist during the initial spray of medicinal liquid.

As described above, by pushing the rod 3 toward the tip to perform the initial spray of medicinal liquid, the syringe 1 enters a restricted state in which pushing is restricted (see FIG. 5A). The initial spray of medicinal liquid is completed when the pushed-in guide portion 71 abuts the push-in restriction portion 703 (specifically, the push-in restriction surface 7030). In other words, the initial spray of medicinal liquid is completed by the operation of the push-in control mechanism 7. As such, the syringe 1 of this embodiment is equipped with a push-in control mechanism 7 that restricts the rod 3 from being pushed toward the tip when the rod 3 is pushed toward the tip a predetermined length (the amount of initial injection) from the initial state. Therefore, the rod 3 can be prevented from being pushed toward the tip more than necessary during the initial administration, allowing the appropriate amount of contents to be dispensed during the initial administration.

Furthermore, once the initial spray of chemical solution is completed, the biasing means 6 causes the body portion 5 to rotate in the rotation direction (e.g., counterclockwise) in which the biasing force is released, and the pushable guide portion 71 is guided by the rotation allowance portion 705 and moves to the release position, which is the end of the rotation allowance portion 705 and the beginning of the second pushable allowance portion 702, thereby entering a released state (see Figure 6A). In this way, the body portion 5 rotates due to the biasing force of the biasing means 6, and the pushing restriction on the rod 3 is released (see Figure 6B).

When the body portion 5 rotates relative to the base portion 4 in the direction in which both biasing engagement portions engage, one of the base-side biasing engagement portion 40 and the body-side biasing engagement portion 50 abuts against the other, elastically deforming the other in the radial or circumferential direction, thereby building up bias. Specifically, the body-side biasing engagement portion 50 of the body portion 5 abuts radially against the elastic portion 401 of the base-side biasing engagement portion 40 of the base portion 4, elastically deforming the elastic portion 401 in the radial direction, building up elastic force in the elastic portion and building up bias. The body-side biasing engagement portion 50 abuts against the elastic portion 401 from the radial outside, elastically deforming 401 radially inward.

Furthermore, when the elastic deformation of the other of the base-side biasing engagement portion 40 and the body-side biasing engagement portion 50 is restored, the bias is released, and the body portion 5 rotates relative to the base portion 4 in a direction that disengages the two biasing engagement portions. Specifically, when the elastic deformation of the elastic portion 401 is restored, the bias of the elastic portion 401 is released, and the body-side biasing engagement portion 50 is pushed in the disengagement direction, causing the body portion 5 to rotate relative to the base portion 4.

When the user of the syringe 1 pushes the rod 3 (specifically, the operating portion 31) toward the tip from the released state, the pushable guide portion 71 is guided by the second pushable portion 702 and reaches the completion position, which is the tip end of the second pushable portion 702, and the second spray of medicinal liquid is performed, reaching the completion state (see Figure 7).

In the syringe 1 of this embodiment, when the rod 3 is pushed to change from the released state to the completed state, the pushed-in guide portion 71 is guided by the second rotation restricting portion 82 and moves toward the tip, reaching the completed position, which is also the tip end of the second rotation restricting portion 82, and thus entering the completed state. At this time, rotation of the body portion 5 is restricted.

Furthermore, during the second spray of the chemical solution, the pressure accumulator 540 of the body 5 and the pressure accumulator protrusion 32 of the rod 3 form a pressure accumulator (see Figure 6A). Specifically, during the second spray of the chemical solution, when the rod 3 is pushed in, a sense of resistance is felt as the base-end pressure accumulator protrusion 320 of the rod 3 overcomes the pressure accumulator 540. This allows the rod 3 to be biased to a level at which the chemical solution can be ejected as a mist during the second spray of the chemical solution.

In this way, by pushing the rod 3 toward the tip to perform the second spray of the liquid medicine, the syringe 1 reaches its final state. The second spray of the liquid medicine is completed when the piston 33 abuts against the inner surface located on the base end side of the tip portion 20 of the barrel 2.

With the syringe 1 described above, the rod 3 moves as a single rigid body only toward the axial tip, and the biasing means 6 and the pushing control mechanism 7, which has a pushing guide portion 70 and a pushed-in guided portion 71, allow the rod 3 to be pushed separately into the first pushing-allowing portion (first pushing) and the second pushing-allowing portion (second pushing). Therefore, the feel of operating the rod 3 during the first pushing and the second pushing are similar, allowing for stable discharge of the contents.

In addition, in the syringe 1 of this embodiment, the biasing means 6 biases the body portion 5 in the rotational direction by utilizing the radial elastic deformation of the elastic portion 401 of the base-side biasing engagement portion 40, allowing for smooth rotation.

The syringe of the present invention is not limited to the above-described embodiment, and various modifications can of course 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.

For example, the configuration of each component of the syringe 1 may differ from the configuration described above.

Specifically, the elastic portion 401 of the base-side biasing engagement portion 40 may be elastically deformable radially outward. Furthermore, as shown in Figures 8A to 13B, the body-side biasing engagement portion 50 may have a base portion 500 extending radially and an extension portion 501 extending circumferentially from the tip of the base portion 500. The base-side biasing engagement portion 40 has a flat abutment surface 403 against which the tip portion 502 of the extension portion 501 abuts (see Figure 8B).

In this syringe 1, when the body portion 5 rotates in the direction in which the two biasing engagement portions engage, the extension portion 501 abuts against the elastic portion 401 from the radially inner side, elastically deforming the elastic portion radially outward. This accumulates biasing force in the biasing means 6.

In addition to the base-side biasing engagement portion 40, the base portion 4 may also have a rotation restriction portion 45 that restricts rotation around the axis of the rod 3 inserted into the barrel 2. In this syringe 1, the rotation restriction portion 45 is, for example, a groove provided on the inner surface 412 of the first cylindrical portion 41. One or more (e.g., four) grooves may be provided. The shaft portion 30 of the rod 3 has a rod body 300 shaped like a rectangular pillar and protrusions 301 (e.g., four protrusions 301) extending radially outward from the rod body 300. Each protrusion 301 is fitted into a corresponding groove (rotation restriction portion 45) provided on the inner surface 412 of the first cylindrical portion 41. As a result, rotation of the rod 3 is restricted by the rotation restriction portion 45 of the base portion 4, ensuring that the rod 3 feels similar when being pushed in for the first time and when being pushed in for the second time.

It is also possible to provide a recess in the rod 3 and a protrusion (rotation restriction portion 45) in the base portion 4, so that the rotation of the rod 3 is restricted by the rotation restriction portion 45 of the base portion 4 via these recessed and protruding portions.

The syringe 1 may further include an auxiliary biasing means that assists the biasing of the biasing means 6. Specifically, the auxiliary biasing means includes a base-side auxiliary biasing portion 46 and a body-side auxiliary biasing portion 55. The base portion 4 has the base-side auxiliary biasing portion 46 (see FIG. 8A). The base-side auxiliary biasing portion 46 is, for example, a convex portion that protrudes from the finger hook portion 43 toward the base end. The body portion 5 has a body-side auxiliary biasing portion 55. The body-side auxiliary biasing portion 55 is a convex portion that protrudes toward the tip end from the body tip-side tube portion 53. A pair of base-side auxiliary biasing portions 46 are provided on either side of the tube axis. Specifically, the pair of base-side auxiliary biasing portions 46 are arranged on opposite sides of the tube axis at 180° intervals. The same applies to the body-side auxiliary biasing portion 55. Note that one or three or more base-side auxiliary biasing portions 46 and three or more base-side auxiliary biasing portions 46 may each be provided. In this syringe 1, the body portion 5 is biased to rotate by the biasing means 6 as well as the engagement between the base-side auxiliary biasing portion 46 and the body-side auxiliary biasing portion 55 (see Figure 11A).

When the body 5 rotates relative to the base 4 in a direction in which the body-side auxiliary biasing portion 55 engages with the base-side auxiliary biasing portion 46, the body-side auxiliary biasing portion 55 abuts against the base-side auxiliary biasing portion 46, and the tip of the body-side auxiliary biasing portion 55 elastically deforms in the circumferential direction. This accumulates a biasing force in the auxiliary biasing means. Furthermore, when the rotation restriction on the body 5 is released and rotation is permitted, the body-side auxiliary biasing portion 55 recovers from its elastic deformation, and the biasing force generated by this recovery causes the body 5 to rotate relative to the base 4 in a direction in which the body-side auxiliary biasing portion 55 moves away from the base-side auxiliary biasing portion 46.

The following provides a detailed explanation of the operations and various states when using this syringe 1.

When a user of the syringe 1 pushes the rod 3 (specifically, the operating portion 31) toward the tip from the initial state (see FIG. 8A), the rod 3 moves toward the tip, and the pushable guide portion 71, located in the initial position, moves toward the tip while being guided by the first pushable portion 701 until it reaches the restricting position, which is the tip end of the first pushable portion 701, and the initial spray of medicinal liquid is performed, resulting in a restricted state (see FIG. 11A). At this time, the pushable guide portion 71 is pressed against the pushable restricting surface 7030, which is the pushable restricting portion 703, and the engagement between the pushable guide portion 71 and the pushable restricting surface 7030 restricts the pushing of the rod 3 (movement toward the tip).

Furthermore, once the initial spray of liquid medicine is completed, the biasing means 6 causes the body portion 5 to rotate in the rotation direction (e.g., counterclockwise), and the pushable guide portion 71 is guided by the rotation allowance portion 705 to move to the release position, which is the end of the rotation allowance portion 705 in the rotation direction and the end position of the base end of the second pushable portion, thereby entering a released state ( FIG. 12A ). In this way, the body portion 5 rotates due to the biasing force of the biasing means 6 (in this syringe 1, the engagement of the base-side auxiliary biasing portion 46 and the body-side auxiliary biasing portion 55 in addition to the biasing means 6), thereby releasing the restriction on pushing the rod 3.

When the user of the syringe 1 pushes the rod 3 (specifically, the operating portion 31) toward the tip from the released state, the pushable guide portion 71 is guided by the second pushable portion 72 and reaches the completion position, which is the tip end of the second pushable portion 702, and a second spray of medicinal liquid is performed, reaching the completion state (see Figure 13A).

In the syringe 1 described above, the body portion 5 and base portion 4 are disposed between the base end of the rod 3 (e.g., the operating portion 31) and the base end of the barrel 2 (e.g., the flange portion 23). In addition, in this syringe 1, the pushing control mechanism 7, the rotation control mechanism 8, the rotation restriction portion 45 for the rod 3, and the biasing means 6 are disposed between the base end of the rod 3 (e.g., the operating portion 31) and the base end of the barrel 2 (e.g., the flange portion 23).

The base-side biasing engagement portion 40 and the body-side biasing engagement portion 50 may both have a radially extending base portion and an elastic portion extending circumferentially from the tip of the base and capable of elastic deformation in the radial direction. Alternatively, only the body-side biasing engagement portion 50 may have a radially extending base portion and an elastic portion extending circumferentially from the tip of the base and capable of elastic deformation in the radial direction. In other words, it is sufficient if at least one of the base-side biasing engagement portion 40 and the body-side biasing engagement portion 50 is configured to be elastically deformable. Furthermore, although the base-side biasing engagement portion 40 is positioned radially inward of the body-side biasing engagement portion 50 in the above embodiment, it may also be positioned radially outward.

Furthermore, while the elastic portion 401 was previously capable of elastic deformation in the radial direction, it may also be elastically deformed so as to expand and contract in the circumferential direction.

Furthermore, the rod 3 does not have to be a single rod-shaped body formed continuously and integrally from the tip to the base end. Specifically, the rod 3 may be configured by connecting a tip region having a tip end and a base region having a base end. More specifically, the rod 3 may be configured as a connected rod-shaped body in which a tip rod portion, which is a single rod-shaped body having a tip end on the tip side and a male thread on the base end, and a base rod portion, which is a single rod-shaped body having a base end on the base side and a female thread on the tip side, are connected by threading the male thread and the female thread together.

The base-side biasing engagement portion 40 and the body-side biasing engagement portion 50 may be one or three or more. Furthermore, they do not have to be arranged at equal intervals in the circumferential direction.

One or three or more push-in guide portions 71 may be provided. In this case, it is conceivable that the same number of push-in guide portions 70 (one or three or more) as the number of push-in guide portions 71 are provided.

In the above embodiment, the push-in guide portion 70 is provided on the body portion 5 and the pushed-in guide portion 71 is provided on the rod 3, but it is also possible to provide the push-in guide portion 70 on the rod 3 and the pushed-in guide portion 71 on the body portion 5.

The first push-in portion 701 may also have a straight groove shape. In this case, the entire first push-in portion 701 becomes the bias holding portion 811, and the bias accumulation portion 810 is not provided.

The base portion 4 does not necessarily have to include the finger hook portion 43.

1...syringe, 2...barrel, 3...rod, 4...base portion, 5...body portion, 6...urging means, 7...push-in control mechanism, 8...rotation control mechanism, 9...spray nozzle, 10...syringe-type spray container, 20...tip portion, 21...base end portion, 22...barrel main body, 23...flange portion, 30...shaft portion, 31...operation portion, 32...pressure accumulation protrusion portion, 33...piston, 40...base-side urging engagement portion (urging engagement portion), 41...first cylindrical portion, 42...second cylindrical portion, 43...finger hook portion, 44...extension portion, 45...rotation restriction portion, 46...base-side auxiliary urging portion, 50...body-side urging engagement portion Joint portion (biasing engagement portion), 51...body main body cylindrical portion, 52...body base end side cylindrical portion, 53...body tip side cylindrical portion, 54...top plate portion, 55...body side auxiliary biasing portion, 70...push-in guide portion, 71...pushed-in guided portion (protrusion), 81...first rotation restricting portion, 82...second rotation restricting portion, 120...spout portion, 121...pipe member, 125...piston, 130...syringe, 131...body portion, 134...finger hook portion, 135...guide portion, 136...introduction path, 136a...convex portion, 137...guiding path, 138...first pressing path, 138a...first pressing path starting portion, 138b...first pressing path end portion, 139...detour path, 139a...detour path start portion, 139b...detour path end portion, 140...second pressing path, 140a...second pressing path start portion, 140b...second pressing path end portion, 150...plunger, 151...tip shaft, 153...elastic portion, 154...projection, 155...connecting portion, 156...base portion, 157...guide portion, 158...operating portion, 220...main body tip portion, 221...main body base end portion, 222...main body connection portion, 300...rod main body, 301...convex portion, 320...base end side pressure accumulating convex portion, 321...tip side pressure accumulating portion Convex portion, 400...base portion, 401...elastic portion, 402...tip portion, 403...contact surface, 410...outer peripheral surface, 411...rod insertion hole, 412...inner peripheral surface, 500...base portion, 501...extension portion, 502...tip portion, 540...pressure accumulation portion, 701...first push-in portion, 702...second push-in portion, 703...push-in restriction portion, 704...rotation restriction portion, 705...rotation restriction portion, 810...force accumulation portion, 811...force retention portion, 7030...push-in restriction surface, F...content liquid, Ka...starting end, Kb...starting end, ending end, Kc...starting end, ending end, Kd...ending end, M...axis

Claims (3)

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 base portion attached to the barrel;
a body portion rotatable relative to the base portion and the rod;
a biasing means including a base-side biasing engagement portion of the base portion and a body-side biasing engagement portion of the body portion, the biasing means biasing the body portion to rotate by engagement between the base-side biasing engagement portion and the body-side biasing engagement portion;
a pushing control mechanism having a pushing guide portion on one of the rod and the body portion, and a pushed guided portion on the other of the rod and the body portion that is guided by the pushing guide portion,
the rod is a single rigid body extending from the distal end to the proximal end,
The pushing guide portion is
a first push-in allowing portion that guides the push-in guide portion and allows the rod to be pushed in;
a second push-in allowing portion that is disposed on the tip side of the first push-in allowing portion and that guides the push-in guide portion to allow the rod to be pushed in;
a push-in restricting portion that is disposed between the first push-in allowing portion and the second push-in allowing portion and that engages with the push-in guide portion to restrict the pushing of the rod,
The first push-in allowing portion is
a rotation restricting portion that restricts rotation of the body portion due to the biasing force of the biasing means;
a rotation allowing portion that allows the body portion to rotate due to the biasing force of the biasing means is connected to the push-in restricting portion;
The syringe is configured such that the push-in restriction by the push-in restriction portion is released when the body portion rotates in the rotation allowing portion due to the biasing force of the biasing means. The syringe according to claim 1, wherein the base portion has a rotation restriction portion that restricts rotation of the rod inserted into the barrel about its axis. At least one of the base side biasing engagement portion and the body side biasing engagement portion is
a radially extending base;
an elastic portion extending in a circumferential direction from a tip of the base portion and elastically deformable in a radial direction or a circumferential direction,
The syringe according to claim 1 or 2, wherein the biasing means biases the body portion in the rotation direction by elastic deformation of the elastic portion.