KR102579563B1 - Medicament delivery device comprising bi-directional plunger and method of using the same - Google Patents

Abstract

In the present invention, a plunger with a rotating part that can be used in both directions within a drug injection device is formed in a separate and coupled structure from the motor, so that reverse rotation of the motor is unnecessary during the initialization operation of the general plunger, and the resulting waiting time is minimized. It relates to a drug injection device including a plunger and a method of using the same.

Description

Medication injection device including a two-way plunger and method of using the same {MEDICAMENT DELIVERY DEVICE COMPRISING BI-DIRECTIONAL PLUNGER AND METHOD OF USING THE SAME}

In the present invention, the plunger is formed in a separate and coupled structure from the motor without a reverse rotation operation for initializing the plunger for replacement with a new drug cartridge into the drug injection device after completion of drug injection, but can be used in both directions to minimize the initialization time of the plunger. It relates to a drug injection device including a two-way plunger and a method of using the same.

Drug injection devices that allow users to inject drugs on their own, that is, enable self-administration, are being developed. Additionally, drug injection devices capable of self-administration are classified into syringe, pen type, pump type, or patch type.

Among them, the pen-type drug injection device includes a needle for injecting the drug, a cartridge containing the drug, a housing for storing the cartridge and inserting the plunger, a plunger that adheres to the cartridge to discharge the drug to the outside, and a main body that drives the motor. is included.

For example, Registered Patent Publication No. 10-1217147 (hereinafter referred to as Document 1) and Published Patent Publication No. 10-2014-0035746 (hereinafter referred to as Document 2) are inserted into a gearbox at the upper end of the transmission shaft to transmit rotational force. A pen-type portable pen-type portable device that is fixed so as to receive power, and has a structure in which the pusher is rotatably coupled to a screw formed on the outer peripheral surface of the lower end of the transmission shaft, receives the rotational force of the transmission shaft by a motor, and causes the pusher to move in a straight line to pressurize the piston of the cartridge. It is about an insulin injection device.

Documents 1 and 2 In the injection device of the invention, when all the insulin contained in the cartridge is used, an initialization operation is required in which the motor rotates in reverse and the pusher returns to its initial state when a new cartridge is replaced.

However, the motor used in the injection device has a very slow rotation speed to prevent accidents caused by the user's insulin injection, so there is a problem that the user needs more waiting time than necessary when the motor reverses.

As another example, Patent Publication No. 10-2016-0112763 (hereinafter referred to as Document 3) is a rotating rod that is connected to a motor shaft and rotates together when the shaft rotates, and is screw-coupled to the tip of the rotating rod, but is inserted inside the body and is connected to the inside of the body. It relates to a drug injector equipped with a remote controller that includes a plunger consisting of a pressurized rod that pressurizes the drug and ejects the drug to the outside.

Document 3 The injector of the invention is driven in such a way that when the axis of the motor is rotated in one direction, the drug is pushed toward the needle, and when the axis of the motor is rotated in the other direction, the pressurizing rod is moved toward the outside of the body, causing a long period of time when the motor is reversed. It is time consuming and cumbersome.

In particular, the inventions in Documents 1 to 3 have a problem in that users cannot urgently use them in the event of an emergency because it takes a long time for the motor to reverse rotation.

Recently, a drug injection device that improves the problem caused by reverse rotation of the plunger as described above has been developed.

Published Patent Publication No. 10-2020-0143775 (hereinafter referred to as Document 4) described below is a plunger capable of moving forward and backward, which reduces the user's waiting time by allowing the user to manually or automatically slide the plunger backward without using a motor, and It relates to a drug injection device including the same.

Document 4 In the device of the invention, when the rotating part no longer rotates, the flat parts of the adjusting part each slide along the inclined part in the second housing in the direction of the rotating part, that is, in the inclined direction, so that the pushing part can move backward manually or automatically as the adjusting part is spaced apart. do.

In the device of the invention in Document 4, when the user manually retracts the pusher portion, the pusher portion located in the housing does not have a structure to prevent the pusher portion from being separated, so the pusher portion may fall out of the housing.

<Background technical literature>

(Document 1) Registered Patent Publication No. 10-1217147

(Document 2) Publication of Patent No. 10-2014-0035746

(Document 3) Public Patent Publication No. 10-2016-0112763

(Document 4) Publication of Patent No. 10-2020-0143775

The present invention solves the problems of the background art and provides a two-way plunger that can minimize the initialization time of the plunger without the initialization operation of the plunger using reverse rotation of the motor to replace the drug cartridge with a new drug cartridge in the drug injection device after completion of drug injection. The purpose is to provide an included drug injection device and a method of using the same.

In addition, the purpose of the present invention is to minimize the waiting time required for initialization of the plunger by forming a structure in which the rotating shaft located within the plunger can be separated from and coupled to the motor.

In particular, the purpose of the present invention is to provide a drug injection device including a two-way plunger that can quickly administer a drug by minimizing the initialization time of the plunger in an emergency situation.

In order to achieve the above object, the drug injection device including a two-way plunger of the present invention is included in the other end of the holder 200, and can be separated and coupled to one end of the motor (M), and can be connected to one end of the motor (M) by using at least one of insertion, rotation, or magnetic force. A two-way plunger (100) that includes a bond separation structure and can be used in both directions; A holder (200) in which a removable cartridge (C) is stored; A needle portion 300 that can be separated and coupled to one end of the holder 200 and includes a needle; and a button portion 400 included at the other end of the motor (M) to control the injection amount of the drug and discharge the drug.

The two-way plunger 100 is formed by penetrating the shaft M1 of the motor M, and includes a first fixing part 110 coupled to one end of the motor M; The shaft (M1) is stored inside, and the first pipe 121 into which the coupling portions 141 and 141-1 are inserted is formed to protrude, and is coupled to one end of the first fixing portion 110 so that the rotating portion 140 is separated. a second fixing part (120) to prevent it from becoming; A nut 130 arranged so that the other end of the plunger 150 comes into contact with it, and rotates and moves linearly along the thread formed on the rotating part 140; A rotating part 140 on one end or the other end of which the shaft M1 is detachable and rotates according to the rotation direction of the motor M; And a plunger 150 that includes a rotating part 140 therein and is disposed to contact one end of the nut 130 and moves linearly according to the direction of linear movement of the nut 130.

In addition, the present invention can be coupled and separated at the other end of the holder 200 to prevent the two-way plunger 100 from being exposed to the outside, and further includes a cover inside which the two-way plunger 100 and the motor (M) are stored. It is characterized by being

The method of using the drug injection device including the two-way plunger described above includes the steps of separating the plunger 150 (S110); Step of separating and combining the rotating part 140 (S120); A step in which the plunger 150 is coupled (S130); and a step (S140) in which the cartridge (C) is replaced.

The present invention is characterized in that in the step (S120) of separating and combining the rotating part 140, the rotating part 140 is separated from the plunger 150, and both ends are formed symmetrically, so that it can be turned over and combined, so that it can be used in both directions.

The drug injection device including a two-way plunger according to the present invention has the effect of minimizing the initialization time of the plunger by using a two-way plunger without using reverse rotation of the motor when replacing the cartridge.

In particular, the present invention has the advantage that the waiting time required for initialization of the plunger is minimized because the rotating part located within the plunger is formed in a structure that can be separated from and combined with the motor.

Furthermore, the present invention minimizes the initialization time of the plunger, enabling rapid administration of medication in the event of an emergency.

Figure 1 is a perspective view of a drug injection device including a two-way plunger according to the present invention.
Figure 2 is an exploded view of a drug injection device including a two-way plunger according to the present invention.
Figures 3 and 4 are exemplary diagrams showing a bidirectional plunger driving method according to the present invention.
Figure 5 is a flowchart of a method of using a drug injection device including a two-way plunger according to the present invention.
<Explanation of symbols>
100: Two-way plunger
110: first fixing unit
120: 2nd fixation unit, 121: 1st tube
130: nut
140: rotating part, 141, 141-1: coupling part,
142, 142-1: Coupling groove
150: Plunger, 151: Rubber packing
200: Holder
300: Needle part
400: Button part
C: Cartridge
M: Motor, M1: Shaft

Hereinafter, the present invention will be described in detail through examples.

The purpose, features, and advantages of the present invention will be easily understood through the following examples.

The present invention is not limited to the embodiments disclosed herein and may be embodied in other forms. The embodiments disclosed herein are provided to enable the idea of the present invention to be sufficiently conveyed to those skilled in the art to which the present invention pertains, and all modifications included in the technical idea and technical scope of the present invention. , should be understood to include equivalents or substitutes.

Therefore, the present invention should not be limited by the following examples, and it should be understood that all transformations included in the technical idea and scope of the present invention are included. That is, a person of ordinary skill in the technical field to which the present invention pertains may modify the present invention in various ways by adding, changing, deleting or adding components, etc., without departing from the spirit of the present invention as set forth in the claims. Changes may be made, and this will also be said to be included within the scope of rights of the present invention.

Since the present invention can be subjected to various modifications and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. In the drawings, the sizes of elements or the relative sizes between elements may be somewhat exaggerated for a clear understanding of the present invention. Additionally, the shapes of elements shown in the drawings may change somewhat due to variations in the manufacturing process.

Therefore, the embodiments disclosed in this specification should not be limited to the shapes shown in the drawings unless otherwise specified, and should be understood to include some degree of modification.

Meanwhile, various embodiments of the present invention may be combined with any other embodiments unless clearly indicated to the contrary. Any feature indicated as being particularly preferred or advantageous may be combined with any other feature or feature indicated as being preferred or advantageous. That is, the various aspects, features, embodiments or implementations of the present invention can be used alone or in various combinations.

It should be understood that the terms used in this specification are only for describing specific embodiments and are not intended to be limited by the claims, and all technical and scientific terms used in this specification are common technical terms unless otherwise specified. It has the same meaning as is generally understood by people with . Singular expressions include plural expressions unless the context clearly dictates otherwise.

In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

<Example 1>

As shown in FIGS. 1 to 4, a drug injection device including a two-way plunger may include a two-way plunger 100, a holder 200, a needle portion 300, and a button portion 400.

Here, the drug may include one or more of insulin, hormones, low-dose heparin, or inducers, but is not limited thereto.

The drug may be contained in the cartridge (C).

To be more specific, the cartridge (C) is formed in a bottle shape so that the medicine can be accommodated, and a rubber membrane may be included inside one end and the other end, respectively.

Here, a needle to be described at the rear end is inserted into the rubber membrane contained inside the cartridge (C), and the medicine can be discharged to the outside through the needle.

Here, the rubber film included inside the other end of the cartridge (C) is arranged to contact one end of the rubber packing 151 of the plunger 150, which will be explained later, and when the plunger 150 moves in the direction of one end of the cartridge (C), it touches the other end. Once the positioned rubber membrane moves in one direction, the medication can be discharged to the outside.

As shown in FIGS. 1 and 2, the two-way plunger 100 has both ends symmetrically formed and is included in the other end of the holder 200, and can be separated and coupled to one end of the motor (M), but can be inserted, rotated, or magnetically. It may contain one or more bond separation structures and can be used in both directions.

To be more specific, the two-way plunger 100 may include a first fixing part 110, a second fixing part 120, a nut 130, a rotating part 140, and a plunger 150 as shown in FIG. there is.

The first fixing part 110 is coupled to one end of the motor (M) as shown in FIG. 2, and may be formed by penetrating the shaft (M1) of the motor (M).

Here, the motor M may be coupled to one end or the other end of the rotating part 140 on the shaft M1 in order to provide rotational movement to the rotating part 140, which will be described later.

At this time, the shaft M1 may be formed with a polygonal pillar extending from the shaft M1 to prevent the rotating part 140 from being separated due to vibration generated during rotational movement through the motor M.

In order to prevent the rotating part 140 from spinning around the shaft M1, the polygonal pillar may be formed by extending a pillar having any polygonal shape other than a cylinder to the shaft M1, preferably a triangular pillar, A square pillar or a pentagonal pillar may be formed extending from the shaft M1, but is not particularly limited thereto.

Here, the polygonal pillar extending from the shaft M1 and the coupling grooves 142 and 142-1, which will be described at the rear end, may be formed in corresponding shapes and fitted into each other.

As shown in FIG. 2, the second fixing part 120 is coupled to one end of the first fixing part 110 and a shaft M1 is stored therein, and one end or the other end of the rotating part 140 is inserted into the rotating part 140. ) can be prevented from being separated due to rotational movement.

Here, the second fixing part 120 may have a first pipe 121 protruding outward at one end, as shown in FIG. 3 .

At this time, the shaft (M1) is located at the center inside the first pipe (121), and the coupling grooves (142, 142-1) included in the coupling portions (141, 141-1) leading into the first pipe (121) are It can be combined with and separated from the shaft (M1).

In addition, since there is no thread inside the first pipe 121, the coupling portions 141 and 141-1 of the rotating part 140 can be easily inserted into or removed from the first pipe 121, so that the two-way plunger 100 can be easily inserted into or removed from the first pipe 121. There is an advantage that the time required for separation and combination is minimized.

Here, the outer diameter of the first pipe 121 may be formed to be larger than the inner diameter of the nut 130, which will be explained later.

Additionally, the inner diameter of the first pipe 121 may be equal to or larger than the outer diameter of the coupling portions 141 and 141-1.

For example, when the inner diameter of the first pipe 121 is formed smaller than the outer diameter of the coupling portions 141 and 141-1, the coupling portions 141 and 141-1 cannot be inserted into the first pipe 121 and the rotating portion ( 140) may not be able to rotate.

Additionally, the height of the first pipe 121 may be formed to correspond to the length of the coupling portions 141 and 141-1 included in the rotating portion 140.

The nut 130 is arranged so that the other end of the plunger 150 comes into contact with it, and can rotate and move linearly along the thread formed on the rotating part 140.

At this time, the nut 130 may include a screw thread therein to rotate along the screw thread formed on the rotating part 140.

Here, the inner diameter of the nut 130 may be formed to have the same size as the outer diameter of the thread of the rotating part 140.

Additionally, the outer diameter of the nut 130 may be equal to or larger than the width of the other end of the plunger 150 so that the other end of the plunger 150 is placed in contact with it.

For example, when the outer diameter of the nut 130 is formed smaller than the width of the other end of the plunger 150, the force applied to the plunger 150 during linear movement is not sufficient as shown in FIG. 3(b), so the plunger 150 may not be able to move in any direction.

The rotating part 140 has both ends symmetrically formed so that it can be coupled and separated from the shaft M1 and rotated according to the rotation direction of the motor M1.

As shown in FIG. 2, the rotating part 140 does not include screw threads at one end and the other end, but may include coupling parts 141 and 141-1 that are introduced into the first pipe 121 described above.

Here, the engaging part located at the other end of the rotating part 140 may be indicated by 141 in the drawing, and the engaging part located at one end of the rotating part 140 may be indicated by 141-1 in the drawing. Additionally, the engaging parts 141 and 141-1 ) Coupling grooves 142 and 142-1 may be included therein, respectively.

The coupling grooves 142 and 142-1 may be formed as grooves in the shape of a corresponding polygonal pillar to fit into the polygonal pillar extending from the shaft M1 described above.

For example, as shown in FIG. 2, when the polygonal pillar extending from the shaft M1 is a square pillar, the coupling grooves 142, 142-1 have a square pillar shape and are connected to the coupling portions 141, 141-1. ) can be formed inside the center.

Here, the coupling groove formed in the coupling portion 141 may be indicated as 142 in the drawing, and the coupling groove formed in the coupling portion 141-1 may be indicated as 142-1 in the drawing.

A typical plunger requires initialization by reversing the motor to return the plunger to its original position before replacing the cartridge, and this has the inconvenient problem of having to wait for a certain period of time for the plunger to return to its original position.

However, in the present invention, as shown in FIG. 4(d), the rotating part 140 having the structure as described above is connected to the coupling portion of the rotating part 140 ( After 141) is separated from the first pipe 121, the rotating part 140 is flipped 180°, and as shown in FIG. 4(e), the coupling part 141-1 is inserted into the first pipe 121 and used immediately. This may be possible.

That is, in the present invention, the initialization of the plunger 150 can be performed quickly without the reverse rotation of the motor M by the rotating part 140 that can be used in both directions within the plunger 150.

Therefore, the drug injection device including the two-way plunger 100 of the present invention has the effect of minimizing the initialization time of the plunger 150 and quickly administering the drug in the event of an emergency.

The plunger 150 has a hole formed therein to accommodate the rotating part 140, and is disposed to contact one end of the nut 130 so that it can move linearly according to the direction of linear movement of the nut 130.

The hole formed in the plunger 150 does not have a screw thread formed therein, so the screw thread of the rotating part 140 described above does not engage with the hole.

In general, the drug injection device includes threads in the hole and rotating part of the plunger and the threads are connected to each other, so the reverse rotation of the motor is required during the initialization operation of the plunger, and as a result, the user has to wait for the initialization operation. there is a problem.

That is, in order to improve the above problem, the present invention does not include a screw thread in the hole formed in the plunger 150, so that the reverse rotation operation of the motor M is unnecessary as the rotating part 140 is accommodated in the hole. This has the advantage of minimizing user waiting time.

In addition, the drug injection device of the present invention has the advantage of improving the lifespan of the motor (M) because the reverse rotation of the motor (M) is not performed during the initialization operation of the plunger (150).

Additionally, the plunger 150 may have a rubber packing 151 coupled to one end.

The rubber packing 151 is arranged to be in close contact with the rubber membrane located at the other end of the previously described cartridge C, so that when the plunger 150 moves in a straight line, the rubber packing 151 moves in the direction of the linear movement of the plunger 150. By moving along the rubber membrane located on the other end of the cartridge (C), the medicine can be discharged to the outside.

Additionally, the rubber packing 151 may be formed of the same material as the rubber film located on the other end of the cartridge C, and one end may be formed to be flat in order to be placed in close contact with the rubber film.

Although not shown in the drawing, a detachable cover disposed between the holder 200 and the button portion 400 may be included to prevent the two-way plunger 100 from being exposed to the outside.

The cover is formed as a circular pillar with both ends open, so that the two-way plunger 100 and the motor (M) can be accommodated therein.

To be more specific, a screw thread is included on one end of the inner surface of the cover and can be rotationally coupled to a screw thread formed on the outer surface of the other end of the holder 200. Additionally, the other end of the cover may be fitted into one end of the button portion 400.

That is, the cover can be separated from the holder 200 and the button portion 400, so replacement of the cartridge C and initialization of the two-way plunger 100 can be easily performed.

As shown in FIGS. 1 and 2, the holder 200 may be formed as a circle or polygonal pillar with one end and the other end open to accommodate and protect the separable cartridge C.

Preferably, the holder 200 may be formed as a circular pillar with one end and the other end open to have a shape corresponding to the cartridge C.

In addition, in order to couple the needle part 300 to one end of the holder 200, a screw thread is included on the outer surface so that the holder 200 can be rotatably coupled to the needle part 300.

In addition, a screw thread may be included on the outer surface of the other end of the holder 200 so that the cover in which the previously described bidirectional plunger 100 and the motor (M) are accommodated can be rotatably coupled to the other end of the holder 200.

Here, the outer surface of the cartridge (C) is in close contact with one end of the holder 200, so that the cartridge (C) can be replaced and used.

The needle unit 300 can be separated and coupled to one end of the holder 200 as shown in FIGS. 1 and 2, and may include a needle.

To be more specific, the needle portion 300 is formed into a shape corresponding to one end of the holder 200 so that it can be separated and coupled to one end of the holder 200, and is formed as a circular pillar with one end closed and the other end open. can be formed.

As shown in Figures 1 and 2, the needle part 300 includes a screw thread on the inner surface of the other end and can be rotationally coupled to a screw thread formed on one end of the holder 200. In addition, the needle part 300 is located at the center. It can be formed by penetrating a needle. At this time, in order to prevent the needle formed in the needle unit 300 from coming off, a needle separation prevention part may be formed to protrude outward at one end of the needle unit 300.

When the needle portion 300 is rotatably coupled to the holder 200, one end of the needle is exposed to the outside, and the other end is inserted into the rubber film formed on one end of the cartridge (C), thereby discharging the medicine contained in the cartridge (C). It can be discharged to the outside through a needle.

At this time, the needle can be used in a sterilized state and has a thickness of 29 to 34 G, but is not limited to this.

For example, if the needle thickness is less than 29G, the needle may be thick and bleeding or bruising may occur, or the user may feel pain.

For example, if the needle thickness exceeds 34G, there is an advantage that the user does not feel pain because the needle is too thin. However, as the needle thickness is manufactured very thin, the cost borne by the user may increase due to an increase in unit price.

In addition, the length of the needle is measured by measuring the length of the needle exposed at the separation prevention portion protruding from one end of the needle portion 300, and 4 to 8 mm may be used, but is not limited thereto.

For example, if the length of the needle is less than 4 mm, there is an advantage that the user does not feel pain, but as the needle is manufactured very short, the cost borne by the user may increase due to an increase in unit price.

For example, if the length of the needle exceeds 8 mm, the length of the needle may be long, causing bleeding or bruising, or the user may feel pain.

Therefore, it is recommended that the needle be 31~32G in thickness and 4~6mm in length to minimize bleeding, bruising, and pain regardless of the user's body type, but this can be changed depending on the user's personal preference. There is no particular limitation.

As shown in FIGS. 1 and 2, the button unit 400 may include a control unit for controlling the amount of medication injected and a button for discharging the medication to the outside at the other end of the motor (M).

To be more specific, the button portion 400 may be formed as a cylinder with one end open, a control portion for adjusting the amount of medicine injected on the side, and a button on the other end.

At this time, the control part included on the side of the button part 400 can be rotated so that the injection amount of medicine can be adjusted.

When the control unit is rotated clockwise, the injection amount of the drug may increase, and when the control unit is rotated counterclockwise, the injection amount of the drug may be decreased.

That is, the user can correct the injection amount of medication through the control unit.

In addition, the control unit is linked to the motor (M) and controls the rotation direction and speed of the nut 130 according to the rotation direction and speed of the control unit to adjust the moving direction and length of the plunger 150 to control the medicine in the cartridge (C). The injection amount can be controlled.

When the user presses the button after manipulating the control unit, the plunger 150 is driven by the amount of medicine set by the control unit to be injected, so that the medicine in the cartridge C can be discharged to the outside through the needle.

Here, a battery and an anti-vibration pad for driving the motor (M) may be included between the motor (M) and the button portion (400).

The battery is placed at the other end of the anti-vibration pad and is connected to the motor (M) to provide electrical energy to the motor (M).

At this time, the battery can be charged or replaced and used, and preferably, the battery can be used after being charged, but is not particularly limited thereto.

Here, when the battery is charged and used, either a wired or wireless method can be used.

For example, when the battery is charged in a wired manner, a charging terminal may be included outside the cover to connect the drug injection device of the present invention to a charging adapter or power cable.

For example, when the battery is charged wirelessly, there is an advantage that a separate charging terminal is not required as the drug injection device of the present invention is charged by being mounted on a charging pad.

The anti-vibration pad is disposed at the other end of the motor (M) to absorb vibration generated from the motor (M) and prevent the vibration from being transmitted to the control unit, thereby preventing the corrected drug injection amount from changing.

At this time, the anti-vibration pad may be a rubber plate to absorb vibration generated from the motor (M), but is not limited to this.

The following is a description of how to use a drug injection device including a two-way plunger with reference to FIGS. 3 to 5.

The method of using a drug injection device including a two-way plunger includes the steps of separating the plunger 150 (S110), separating and combining the rotating part 140 (S120), combining the plunger 150 (S130), and The step S140 of replacing the cartridge C may be performed sequentially.

The step (S110) of separating the plunger 150 may be performed after processes (a) to (c) are completed, as shown in FIG. 3.

Figure 3(a) is the initial stage in which the cartridge C is mounted and the plunger 150 is not operated.

In Figure 3(b), as the rotary part 140 is rotated by the motor M, the nut 130 can rotate along the thread of the rotary part 140 and move forward at the same time. At this time, the plunger 150 is disposed in contact with one end of the nut 130, so that the plunger 150 advances along the operating direction of the nut 130 and pushes the rubber membrane located on the other end of the cartridge (C) so that the medicine follows the needle. It may be discharged to the outside.

That is, Figure 3(b) shows the stage in which the plunger 150 is operated and the medicine is injected.

Thereafter, in Figure 3(c), when the nut 130 reaches the coupling portion 141-1 located at one end of the rotating portion 140, the nut 130 may no longer rotate and the forward motion may stop. At this time, the plunger 150 disposed in contact with the nut 130 may no longer advance and may stop operating, and all of the medicine within the cartridge C is discharged, leaving the cartridge C empty.

That is, in Figure 3(c), the operation of the plunger 150 has stopped and injection of the medicine has been completed, and the cartridge C needs to be replaced.

Afterwards, a step (S110) in which the plunger 150 is separated may be performed.

In the step S110 in which the plunger 150 is separated, the plunger 150 may be pulled outward and separated from the rotating unit 140, as shown in FIG. 4(d).

Next, a step (S120) in which the rotating unit 140 is separated and combined may be performed.

In the step (S120) in which the rotating part 140 is separated and combined, as shown in FIGS. 4 (d) and 4 (e), the coupling part 141 located at the other end of the rotating part 140 is connected to the first pipe 121. is separated from

The separated rotary part 140 can be flipped 180° and the coupling part 141-1 located at one end of the rotary part 140 can be inserted into the first pipe 121, as shown in FIG. 4(e).

At this time, the coupling groove 142-1 located in the coupling portion 141-1 and the shaft M1 are fitted so that the nut 130 can be in an initialized state as shown in FIG. 3(a).

Here, the rotary part 140 is formed symmetrically at both ends so that the direction of the thread included in the rotary part 140 does not change even if it is turned over, allowing it to be used in both directions. This minimizes the initialization work time of the plunger 150, allowing quick operation in the event of an emergency. Medicines can be administered appropriately.

In addition, in the two-way plunger 100, the rotating part 140 can be separated and combined from the first pipe 121 and the plunger 150, so reverse rotation of the motor M is unnecessary, thereby increasing the lifespan of the motor M. There is an advantage that this is improved and the waiting time required for initialization of the plunger 150 is minimized.

Next, a step (S130) in which the plunger 150 is coupled may be performed.

In the step (S130) in which the plunger 150 is coupled, as shown in FIG. 4(e), the rotating part 140 coupled to the first pipe 121 is re-entered into the plunger 150, and the plunger 150 The other end is placed in contact with one end of the nut 140, so that the plunger 150 can be in an initialized state as shown in FIG. 3(a).

Thereafter, a step (S140) in which the cartridge C is replaced may be performed.

In the step (S140) in which the cartridge (C) is replaced, the used cartridge (C) inserted into the holder 200 is removed, and a new cartridge (C) is inserted into the holder 200 to be replaced.

At this time, the rubber packing 151 of the plunger 150 may be placed in close contact with the rubber membrane located on the other end of the new replaced cartridge (C).

<Example 2>

The drug injection device including the two-way plunger of Example 1 may further include a magnet.

The drug injection device including a two-way plunger except for the magnet is formed in the same manner as Example 1, so overlapping details will be omitted.

The magnet may be included in one end of a polygonal pillar extending from the shaft M1 to improve the coupling force between the rotating part 140 and the shaft M1.

At this time, as the magnet is included in one end of the polygonal pillar extending from the shaft M1, the magnet is drawn into the coupling grooves 142 and 142-1 of the rotating part 140 and coupled by an attractive force, so that the rotating part 140 There is an advantage that the coupling force between the shaft M1 and the shaft M1 is improved.

Here, the rotating part 140 is made of a metal material to be coupled by a magnet so that the magnet can be coupled to it.

For example, when the rotating part 140 is made of a material other than metal, another magnet is included in the coupling grooves 142 and 142-1, so that the magnet included in the shaft M1 and the magnet included in the rotating part 140 are connected to each other. can be combined

The present invention is a drug injection device including a two-way plunger and a method of using the same. The rotating part inserted into the plunger has a symmetrical structure and is formed in a separate and coupled structure on the shaft of the motor to enable two-way use, so that the waiting time required for initialization of the plunger is This is an industrially usable invention that minimizes this.

Claims (6)

A two-way plunger (100) included at the other end of the holder (200), capable of being separated and coupled to one end of the motor (M), and capable of being used in both directions by including at least one coupling/disconnection structure of fitting, rotation, or magnetic force;
A holder (200) in which a removable cartridge (C) is stored;
A needle portion 300 that can be separated and coupled to one end of the holder 200 and includes a needle; and
A button portion 400 included at the other end of the motor (M) to control the injection amount of the drug and discharge the drug;
A drug injection device including a two-way plunger, characterized in that it includes. In claim 1,
The two-way plunger 100 is,
A first fixing portion 110 formed through the shaft M1 of the motor M and coupled to one end of the motor M;
The shaft (M1) is stored inside, and the first pipe 121 into which the coupling portions 141 and 141-1 are inserted is formed to protrude, and is coupled to one end of the first fixing portion 110 so that the rotating portion 140 is separated. a second fixing part (120) to prevent it from happening;
A nut 130 arranged so that the other end of the plunger 150 comes into contact with it, and rotates and moves linearly along the thread formed on the rotating part 140;
A rotating part 140 on one end or the other end of which the shaft M1 is detachable and rotates according to the rotation direction of the motor M; and
A plunger 150 that includes a rotating part 140 therein and is disposed to contact one end of the nut 130 and moves linearly according to the direction of linear movement of the nut 130;
A drug injection device including a two-way plunger, characterized in that it includes. In claim 1,
In order to prevent the two-way plunger 100 from being exposed to the outside, the other end of the holder 200 can be coupled and separated, but a cover in which the two-way plunger 100 and the motor (M) are stored is further included. , a drug injection device with a two-way plunger. In the method of using a drug injection device including the two-way plunger of any one of claims 1 to 3,
The plunger 150 is separated (S110);
Step of separating and combining the rotating part 140 (S120);
A step in which the plunger 150 is coupled (S130); and
A step in which the cartridge (C) is replaced (S140);
A method of using a drug injection device including a two-way plunger, characterized in that it includes. In claim 4,
In the step (S120) in which the rotating part 140 is separated and combined, the rotating part 140 is separated from the plunger 150, and the two-way plunger is characterized in that both ends are formed symmetrically and can be flipped and combined so that it can be used in both directions. How to use the included medication injection device. A drug injection device including a two-way plunger, characterized in that it is used in the method of claim 4.