WO2023022245A1

WO2023022245A1 - Fixed-quantity injection device of medicinal fluid

Info

Publication number: WO2023022245A1
Application number: PCT/KR2021/010928
Authority: WO
Inventors: 장지영
Original assignee: (주)제이엠바이오텍
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2023-02-23
Also published as: KR20240038986A; CN117794594A

Abstract

The present invention relates to a fixed-quantity injection device in which a syringe can be installed and a medicinal fluid accommodated in the syringe can be injected in a fixed quantity by a user's push action. The fixed-quantity medicinal fluid injection device according to the present invention enables a user to inject the medicinal fluid into various areas in a fixed quantity by using one hand, thereby maximizing maneuverability and convenience. In addition, there is an effect of maximizing drug delivery efficiency even during use by non-medical staff at home rather than in a hospital.

Description

Chemical liquid metering injection device

The present invention relates to a device for metering a drug solution, and more particularly, to a device for metering a drug solution capable of providing various solutions, such as drugs and cosmetics, to a target tissue over a large area through manipulation by a user.

In order to specifically deliver a drug to a thin tissue such as skin, a method of applying a drug to the skin surface is widely used. However, in the case of the method of applying the drug to the skin surface, there is a problem in that it is difficult to expect an appropriate treatment effect due to low absorption rate. In order to solve this problem, recently, a method of penetrating into skin tissue using a short needle and delivering a drug has been developed and used. Regarding this prior art, Korean Patent Registration No. 1939061 has been disclosed.

However, this prior art has a problem that does not satisfy self-injection, for example, when extremely convenience is required, such as when injecting into one's own face.

An object of the present invention is to provide a drug liquid metering device for delivering a fixed amount of drug to the skin with a simple operation by maximizing convenience for solving the above-mentioned problems.

As a means to solve the above problem, an upper housing in which a first cavity is formed through in a vertical direction, and a lower portion in which a second cavity is formed in a vertical direction and is configured to be connectable to a lower side of the upper housing. The housing, a cap disposed above the first cavity, and at least a portion of which is configured to perform a linear reciprocating motion on the first cavity, and a cap that moves downward for each reciprocating motion in the vertical direction of the cap to push the piston of the syringe. A drug liquid metering injection device including a metered transfer module configured to be able to be provided may be provided.

On the other hand, the quantitative movement module is configured to move downward by receiving force from the lower end of the cap, and to be inserted into the hollow of the first pushing block, the upper housing, and the first pushing block in which a hollow is formed in the vertical direction. It may include a pushing bar that extends to a predetermined length and is configured such that one side thereof is supported and moved downward by a predetermined distance as the first pushing block moves downward.

Meanwhile, at least a portion of the lower portion of the pushing bar may be inserted into the syringe.

In addition, the lower end of the pushing bar may be inserted into the syringe to press the piston of the syringe.

On the other hand, the pushing bar includes a linear ratchet gear formed in the longitudinal direction on the side, the first pushing block includes a first pawl engaged with the ratchet gear, and the linear ratchet gear and the first pole may be configured to move the pushing bar in a downward direction and limit the movement in an upward direction.

On the other hand, it further includes a second pushing block spaced apart from the first pushing block to the lower side of the first cavity by a predetermined distance, and the second pushing block has a hollow and a pushing bar in which a hollow is formed so that the pushing bar can be inserted in the vertical direction. It may include a second pawl engaged with the linear ratchet gear so as to be moved in a downward direction.

Meanwhile, a first spring provided between the cap and the first pushing block and a second spring provided between the first pushing block and the second pushing block may be further included.

On the other hand, a hollow in the vertical direction is formed so that the pushing bar can be inserted, one side supports the lower side of the second pushing block, and the other side is configured to be fixed in the first cavity. It may further include a guide ring.

Meanwhile, the first pushing block may be configured to move to a position in close contact with the second pushing block when pressed downward by the cap, and may be configured to return to its original position by a second spring when not pressed.

Meanwhile, when a downward force is transmitted to the first pushing block by the cap, the first pushing block moves downward along with the pushing bar while limiting the relative movement of the linear ratchet gear by the first pawl, and the second pushing block The second pawl of may be configured to allow relative movement of the linear ratchet gear while the position is fixed.

In addition, when the force acting on the first pushing block in the downward direction is removed, the first pushing block is moved upward by the second spring, and the relative movement of the linear ratchet gear is restricted by the second pawl of the second pushing block. And, the first pole of the first pushing block may allow relative movement of the linear ratchet gear.

Meanwhile, the pushing bar may include a plurality of linear ratchet gears, and a plurality of first poles and second poles corresponding to the number of linear ratchet gears.

On the other hand, the syringe may include a tip configured to be connected to the needle adapter of the syringe in a state inserted into the second cavity.

In addition, the tip includes an internal passage configured to be in fluid communication with the needle adapter and a plurality of needles, each of the plurality of needles being configured to be in fluid communication with the internal passage, spaced apart from each other, and a part of the lower end may protrude downward from the lower surface of the tip.

The drug solution metering injection device according to the present invention has an effect of maximizing operability and convenience by allowing a user to pump and inject drugs and various solutions in a fixed amount to various areas by clicking and operating with one hand.

In addition, there is an effect of maximizing drug delivery efficiency even when operated by non-medical staff at home rather than in a hospital.

1 is a front view of an apparatus for injecting a chemical solution according to an embodiment of the present invention.

2 is an exploded perspective view of an apparatus for injecting a chemical solution according to an embodiment of the present invention.

3 is a cross-sectional view of an apparatus for injecting a chemical solution according to an embodiment of the present invention.

4 is an enlarged cross-sectional view of I in FIG. 3 .

5a, 5b and 5c are operation state diagrams of the pushing block by user's manipulation.

6 is a view showing the position of a piston moved by repetitive operation of a quantitative movement module.

7 is a concept illustrating a concept of resetting a position of a pushing bar.

8 is a conceptual diagram illustrating a concept of inserting a syringe into a lower housing.

9 is a conceptual diagram illustrating a fastening operation of a tip.

10 is a diagram illustrating a state of use of an apparatus for injecting a chemical solution according to an embodiment of the present invention.

11 is another use state diagram of a device for injecting a chemical solution according to an embodiment of the present invention.

Hereinafter, a drug liquid metering injection device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, in the description of the following embodiments, the name of each component may be called a different name in the art. However, if they have functional similarity and identity, even if a modified embodiment is employed, it can be regarded as an equivalent configuration. In addition, signs added to each component are described for convenience of description. However, the contents of the drawings in which these symbols are written do not limit each component to the scope in the drawings. Likewise, even if an embodiment in which the configuration in the drawings is partially modified is employed, it can be regarded as an equivalent configuration if there is functional similarity and identity. In addition, in light of the level of a general technician in the relevant technical field, if it is recognized as a component that should be included, the description thereof will be omitted.

On the other hand, in the following, the chemical liquid metering injection device will be defined and described as a vertical direction based on the state shown in FIG. 1 . That is, it will be described on the premise that a cap to be described later is disposed on the upper side, and a tip to be described later is disposed on the lower side.

Hereinafter, with reference to FIGS. 1 to 4 , the configuration of a chemical liquid metering injection device 1 according to an embodiment according to the present invention will be described in detail.

1 is a front view of a drug solution metering device 1 according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a drug solution metering device 1 according to an embodiment of the present invention, and FIG. It is a cross-sectional view of the chemical liquid metering injection device 1 according to an embodiment, and FIG. 4 is an enlarged cross-sectional view of I in FIG. 3 .

Referring to FIGS. 1 to 4 , the drug solution metering device 1 according to an embodiment of the present invention is configured to pressurize the syringe 1000 loaded therein while moving a certain amount by a user's one-time reciprocating operation. It can be. That is, the piston 1200 of the syringe 1000 is moved by a single operation, and as the piston 1200 moves inside the syringe 1000, various solutions such as drugs or cosmetics are transferred to the tip 500. It may be configured to flow out through the needle 510 . That is, it is composed of a pen type and may be composed of a click type pump system that injects a chemical solution by clicking.

It may include an upper housing 100, a lower housing 200, a cap 300, a syringe 1000, a quantitative movement module 400, and a tip 500.

The upper housing 100 and the lower housing 200 may have a hollow formed inside in the vertical direction, and the syringe 1000 and the quantitative movement module 400 may be provided in the hollow inside.

The upper housing 100 and the lower housing 200 are configured to be used by being coupled to each other in the vertical direction, and are disassembled for insertion and removal of the syringe 1000 and resetting the position of the pushing bar 410 to be described later. can The upper housing 100 and the lower housing 200 may be configured in a cylindrical shape to improve convenience when a user grips and manipulates them.

The upper housing 100 is formed by extending a predetermined length in the vertical direction, and a first cavity 101 formed in the vertical direction is formed on the inside, and is configured so that the quantitative movement module 400 and the cap 300 can be provided. It can be. A guide ring 440 may be provided on the lower side of the upper housing 100 to prevent the second pushing block 430 of the quantitative movement module 400 from being disengaged to the lower side. The guide ring 440 may prevent the second pushing block 430 to be described later from moving downward, but may be hollow so that the pushing bar 410 can pass through the center portion.

A cap support 110 configured to prevent the cap 300 from being separated may be provided on the upper side of the upper housing 100 . The cap support 110 may protrude to a predetermined length within the first cavity 101 toward the central axis. The cap support part 110 may be configured to have an inner diameter through which one side of the cap 300 passes, but the cap protrusion 310 to be described later does not pass through. Accordingly, the upward movement of the cap 300 is limited by the cap support 110 over a predetermined distance.

The lower housing 200 is formed by extending a predetermined length in the vertical direction, and may be configured to be fastened to the lower side of the upper housing 100 . The lower housing 200 may have a second cavity 201 formed in a vertical direction. The second cavity 201 may be configured such that the syringe 1000 can be inserted from the upper side of the lower housing 200 to the lower side.

A syringe support 210 protruding radially toward the second cavity 201 may be provided on a lower side of the lower housing 200 . The syringe support part 210 supports the lower side of the syringe 1000 when the syringe 1000 is inserted into the second cavity 201 . In addition, the syringe support part 210 is configured such that a hole is formed in the central portion so that the needle adapter 1100 of the syringe 1000 can be mounted while being inserted into the hole.

The cap 300 is provided on the upper side of the upper housing 100 and may be provided with at least a portion inserted into the first cavity 101 . The cap 300 may move in a vertical direction due to a user's pressing motion, but may be configured to limit upward departure. The cap 300 is configured to be inserted into the second cavity 201 in an upward direction, and on the lower side of the cap 300, a cap protrusion 310 protrudes in a radial direction so as to be associated with the cap support 110 may be provided. The cap 300 is configured such that a hollow is formed in the central portion so that a pushing bar 410 to be described later can be inserted in a vertical direction. This will be described in detail later with reference to FIG. 8 .

The quantitative movement module 400 is configured such that an end portion of the cap 300 can be moved downward by a predetermined distance when the user presses the cap 300 . At least a portion of the quantitative movement module 400 is disposed in the first cavity 101, and at least a portion is configured to be in close contact with the piston 1200 inside the syringe 1000 mounted in the second cavity 201. .

The quantitative movement module 400 may include a pushing bar 410, a first pushing block 420, a second pushing block 430, a first spring 450 and a second spring 460. The pushing bar 410 is formed to extend in the longitudinal direction, and may be configured to move downward by the support motion of the first pushing block 420 and the second pushing block 430 .

The pushing bar 410 may have an outer diameter that can be inserted into the cap 300 , the second cavity 201 , and the syringe 1000 . At least one linear ratchet gear 411 may be provided on the side of the pushing bar 410 . As an example, the ratchet gear 411 may be provided in opposite directions on the side of the pushing bar 410 . The inclination of gear teeth of the ratchet gear 411 may be determined so as to be movable only in a downward direction by the first pushing block 420 and the second pushing block 430 . As an example, the upper surface of each gear tooth of the ratchet gear 411 is configured in a horizontal direction, and at least a portion of the lower surface may be configured as an inclined surface facing downward as it moves away from the center of the pushing bar 410.

The first pushing block 420 and the second pushing block 430 are disposed in the vertical direction, and may be configured to move the pushing bar 410 downward by a predetermined distance as the distance between them is adjusted. The first pushing block 420 may include a first pawl 421 engaged with the ratchet gear 411 . The first pole 421 is formed by extending downward from the upper side of the first pushing block 420, and may have gear teeth directed toward a central axis in the vertical direction at the lower end. The lower surface of the gear teeth of the first pole 421 is formed in a horizontal direction, and at least some of the upper surfaces of the teeth may have inclined surfaces inclined downward toward the central axis.

Like the first pushing block 420, the second pushing block 430 may include a second pole 431. The second pole 431 extends from the upper side of the second pushing block 420 to the lower side to a predetermined length, and may include gear teeth. Orientation of gear teeth may also be provided in the same way as the first pole 421 .

The first pawl 421 and the second pawl 431 are made of an elastic material and are configured to be bent when the ratchet gear 411 exits downward, and the teeth of the ratchet gear 411 are the first pawl ( 421) and the gear teeth of the second pawl 431 may be configured to support the upper surface of the teeth of the ratchet gear 411 passed through the original position.

The first spring 450 is provided between the cap 300 and the first pushing block 420, and may provide an upward force for returning to the original position after the cap 300 moves downward.

The second spring 460 is provided between the first pushing block 420 and the second pushing block 430, and has an upward force for returning to the original position after the first pushing block 420 moves downward. can provide.

Meanwhile, the aforementioned first pushing block 420, the second pushing block 430, the first spring 450, and the second spring 460 are provided with a space into which the pushing bar 410 can be inserted. can

The tip 500 is provided on the lower side of the lower housing 200 and may be detachably provided from the syringe support 210 . The upper side of the tip 500 is connected to the syringe support 210 and may be configured to be in fluid communication with the needle adapter 1100 of the syringe 1000. At the end of the tip 500, a plurality of needles 510 protruding from the end surface to a predetermined length may be provided. An internal flow path configured to allow fluid communication between the needle adapter 1100 of the syringe 1000 and each of the plurality of needles 510 may be provided inside the tip 500 . Accordingly, the chemical solution leaked out by pressurizing the syringe 1000 may be discharged through the plurality of needles 510 . Meanwhile, the outer surface of the upper end of the tip may be fixed in close contact with the lower side of the syringe support 210, and the inner surface may be configured such that the needle adapter 1100 can be inserted. At this time, needles equipped with needle adapters 1100 having various outer diameters according to the inner diameter of the upper end of the tip may be used, and needles equipped with needle adapters having a somewhat smaller outer diameter may also be used without changing the structure. Meanwhile, the connection structure between the upper end of the tip and the syringe support 210 may be configured by being transformed into various known structures.

The protruding length of the plurality of needles 510 may be determined as a length that allows the needles 510 to be inserted into the skin when the bottom surface of the tip 500 is in close contact with the surface of the skin. Preferably, the protruding length of the plurality of needles 510 may be within 2 mm.

On the other hand, the tip may be provided with various types of needles. Depending on the type of needle, the tip may perform a function of injecting a chemical solution and stimulating the skin. Specifically, the needle of the tip can reach the skin surface, superficial layer, epidermis layer, and targeting skin layer depending on the type, thereby stimulating tissue and/or drug-like A variety of solutions (purposed liquid solutions) can be injected.

Referring back to FIGS. 3 and 4 , the cap 300 and the first pushing block 420 and the first pushing block 420 and the second pushing block 430 may be spaced apart from each other by a predetermined distance in the vertical direction. there is.

In particular, the distance between the first pushing block 420 and the second pushing block 430 in a vertical direction may be determined as a distance that the user intends to move by one-time pressing operation. As an example, the ratchet gear 411 may be spaced apart by two lengths. Meanwhile, the number of first poles 421 and second poles 431 may correspond to the number of ratchet gears 411 provided on the pushing bar 410 .

Hereinafter, the operation of the quantitative movement module 400 will be described in detail with reference to FIGS. 5A, 5B and 5C.

Referring first to FIG. 5A , as described with reference to FIG. 4 , the cap 300 is provided on the upper side of the first pushing block 420 and supported by the first spring 450 to form the first cavity 101 It can be placed in the uppermost position among them. The lower side of the second pushing block 430 is supported by the guide ring 440 so that movement in the lower direction may be limited. The first pushing block 420 is provided between the cap 300 and the second pushing block 430, the upper side is supported by the first spring 450, and the lower side is supported by the second spring 460. can

In the standby state, the first pushing block 420 and the second pushing block 430 may be disposed in a spaced apart state by the second spring 460 . At this time, the separation distance may be determined by the length of the pushing bar that the user intends to descend with one pushing operation, as described above.

Afterwards, referring to FIG. 5B , when the user presses the cap 300 downward, the cap 300 descends and adheres to the first pushing block 420 to transmit force, and accordingly, the first pushing block 420 It also moves downward and adheres to the upper side of the second pushing block 430 . At this time, the pushing bar 410 moves downward along with the first pushing block 420 while the ratchet gear 411 is supported by the first pole 421 of the first pushing block 420 .

Afterwards, referring to FIG. 5C , when the pressing force is released by the user, the first pushing block 420 moves upward by the second spring 460, and at this time, the pushing bar 410 moves the ratchet gear 411 to the second While supported by the second pole 431 of the pushing block 430, the upward movement is restricted, and only the first pushing block 420 moves upward. The first pole 421 of the first pushing block 420 moves upward relative to the ratchet gear 411 .

Meanwhile, the cap 300 is moved away from the second pushing block 430 by the second spring 460, and the cap support 110 restricts the cap 300 from moving upward to the initial position as shown in FIG. 5A. will do

5A to 5C, the pushing bar 410 is spaced downward by a predetermined distance, and the cap 300, the first pushing block 420, and the second pushing block 430 return to their original positions. do.

FIG. 6 is a view showing the position of the piston 1200 moved by repetitive operation of the quantitative movement module 400 .

Through the process of FIGS. 5A to 5C described above, the pushing bar 410 descends a certain distance due to one pressing operation. On the other hand, since the lower end of the pushing bar 410 supports the piston 1200 of the syringe 1000, the user can inject a fixed amount of the drug solution by pressing once. This operation is repeatedly performed so that a certain amount of liquid medicine can be supplied for each pressing motion, and the user can repeatedly perform the pressing motion until all of the chemical liquid contained in the syringe 1000 is used. Meanwhile, the moving distance of the pushing bar 410 by one click may be determined by the tooth size of the ratchet gear 411 . That is, when the length of the teeth of the ratchet gear 411 in the vertical direction is greater, the unit distance for one movement may increase, so the injected chemical may also increase. Also, the moving distance of the pushing bar moved by clicking the cap once may be determined by the initially set distance between the first pushing block 420 and the second pushing block 430 . That is, the amount of chemical liquid injected may be adjusted in correspondence with the distance at which the first pushing block 420 descends due to the click operation.

Hereinafter, with reference to FIGS. 7 to 9 , a preparation process performed by a user to use the device for supplying a fixed quantity of chemical solution according to the present invention will be described.

7 is a concept illustrating the concept of resetting the position of the pushing bar 410.

As described above, the pushing bar 410 is allowed to move only in the downward direction by the operation of the first pushing block 420 and the second pushing block 430 . Therefore, when the ratchet gear 411 leaves the first pole 421 of the first pushing block due to the user's repeated pressing motion, no further movement is performed.

Accordingly, the user disassembles the upper housing 100 and the lower housing, and pulls the pushing bar 410 downward from the upper housing 100 to take it out. Thereafter, the user maintains the direction of the pushing bar 410, aligns it with the hollow formed in the cap 300, and pushes it downward. At this time, the ratchet gear 411 of the pushing bar 410 may be pushed downward to a position where it interacts with the first pawl 421 and the second pawl 431 to complete the reset. Accordingly, the user can reuse the device for metering injection of the drug solution after resetting the position of the pushing bar and replacing the syringe. On the other hand, for the convenience of the user, the vertical length of the cap 300 in the vertical direction is controlled by the ratchet gear 411 of the pushing bar 410 when the upper end of the pushing bar 410 and the upper end of the cap 300 are aligned. 2 may be determined to be associated with pole 431 .

8 is a conceptual diagram illustrating the concept of inserting the syringe 1000 into the lower housing 200. Referring to FIG. 8 , the user mounts the syringe 1000 containing the liquid medicine into the second cavity 201 . At this time, the syringe 1000 is prevented from being moved downward by the syringe support 210 provided on the lower side of the lower housing 200 .

9 is a conceptual diagram illustrating a fastening operation of the tip 500.

Referring to FIG. 9 , after the user mounts the syringe 1000 in the second cavity 201, the upper housing 100 may be fastened to the lower housing 200 to complete preparation for use. When fastening the upper housing 100 and the lower housing 200, the user must align and fasten the lower end of the pushing bar 410 to the inside of the syringe 1000. At this time, it is preferable that the position of the pushing bar 410 on the upper housing 100 is reset and fastened.

Hereinafter, with reference to FIGS. 10 and 11 , the use of the chemical liquid metering injection device 1 according to the present invention will be described.

10 is a diagram illustrating a state of use of a device for injecting a chemical solution according to an exemplary embodiment 1 according to the present invention.

Referring to FIG. 10 , the drug liquid metering injection device 1 according to the present invention can perform a single injection operation due to a user's pressing operation. Thereafter, the user may move the drug solution metering injection device 1 to another location and then perform a single injection operation by pressing. After that, the user may move the chemical liquid metering injection device 1 to another position and then perform one injection operation by pressing. As a result, the user can supply the drug in a fixed amount to a treatment area of a large area using one syringe 1000 . However, an example in which one pressing operation is performed at each injection position is illustrated with reference to this drawing, but this is only an example. The injection volume can be adjusted. Even at this time, it is possible to determine the total amount of the chemical solution delivered by multiplying the amount of the chemical solution determined in one pressing operation by the number of pressing operations.

11 is another use state diagram of the chemical solution metering injection device 1 according to an embodiment of the present invention.

As shown, the drug solution metering device 1 according to an embodiment of the present invention is configured in a pen type and can be configured to be gripped and operated with one hand. The user can inject the chemical solution by pressing the cap 300 with his or her thumb while holding the chemical solution metering injection device 1 . On the other hand, when it is necessary to inject the chemical solution evenly into a large area such as the face, the user moves the chemical solution metering injection device 1 while holding it with one hand, presses the cap 300 to inject the chemical solution, and moves to another location to perform the same process. can be repeated

As described above, the drug solution metering device according to the present invention has an effect of maximizing manipulability and convenience because the user can inject the drug in a fixed amount into various areas by operating with one hand.

Claims

an upper housing having a first cavity penetrating in a vertical direction;

a lower housing configured to be connectable to a lower side of the upper housing and having a second cavity penetrating in a vertical direction;

a cap disposed above the first cavity and configured to linearly reciprocate at least a portion of the cap on the first cavity;

A drug liquid metering injection device comprising a metered-quantity movement module configured to push the piston of the syringe by moving downward by a predetermined distance for each reciprocating motion of the cap in the up-down direction.
According to claim 1,

The quantitative movement module,

a first pushing block configured to move downward by receiving force from the lower end of the cap and having a hollow shape in the vertical direction;

It is formed to extend to a predetermined length so as to be inserted into the hollow of the upper housing and the first pushing block, and as the first pushing block moves downward, one side is supported and configured to move downward a predetermined distance. A chemical liquid metering device including a pushing bar to be.
According to claim 2,

At least a portion of the lower portion of the pushing bar is configured to be inserted into the syringe.
According to claim 3,

The lower end of the pushing bar is inserted into the syringe and is configured to press the piston of the syringe.
According to claim 3,

The pushing bar includes a linear ratchet gear formed in the longitudinal direction on the side,

The first pushing block includes a first pawl engaged with the ratchet gear,

The linear ratchet gear and the first pawl are configured to move the pushing bar in a downward direction and limit the upward movement.
According to claim 5,

Further comprising a second pushing block provided in the first cavity and spaced apart from the first pushing block by a predetermined distance,

The second pushing block includes a hollow in which a hollow is formed so that the pushing bar can be inserted in a vertical direction and a second pawl engaged with the linear ratchet gear so that the pushing bar can be moved in a downward direction. injection device.
According to claim 6,

a first spring provided between the cap and the first pushing block; and

The drug solution metering device further comprising a second spring provided between the first pushing block and the second pushing block.
According to claim 7,

and a guide ring configured such that a hollow in a vertical direction is formed so that the pushing bar can be inserted therein, one side supports the lower side of the second pushing block, and the other side is configured to be fixed in the first cavity. injection device.
According to claim 8,

The first pushing block,

It is configured to move to a position in close contact with the second pushing block when pressed downward by the cap,

A chemical solution metering device configured to be returned to an original position by the second spring when not pressurized.
According to claim 9,

When a downward force is transmitted to the first pushing block by the cap,

The first pushing block moves downward along with the pushing bar while limiting the relative movement of the linear ratchet gear by the first pawl,

The second pawl of the second pushing block is configured to allow relative movement of the linear ratchet gear in a fixed position.
According to claim 10,

When the force acting on the first pushing block in the downward direction is removed, the first pushing block is moved upward by the second spring,

Limiting the relative movement of the linear ratchet gear by the second pole of the second pushing block,

The first pole of the first pushing block allows a relative movement of the linear ratchet gear.
According to claim 5,

The pushing bar is provided with a plurality of the linear ratchet gears,

The first pole and the second pole are composed of a plurality corresponding to the number of the linear ratchet gears.
According to claim 12,

A drug solution metering device comprising a tip configured to be connected to a needle adapter of the syringe in a state in which the syringe is inserted into the second cavity.
According to claim 13,

The tip includes an internal flow path configured to be in fluid communication with the needle adapter and a plurality of needles,

Each of the plurality of needles,

It is configured to be in fluid communication with the internal flow path,

are spaced apart from each other,

A drug solution metering device in which a portion of the lower end protrudes downward from the lower surface of the tip.