KR20220032391A - Apparatus for Infusing medical liquid - Google Patents

Abstract

The present invention provides a liquid medicine injection device which comprises: a base body; a needle assembly body mounted on the base body; a reservoir fluidly connected to the needle assembly body and storing a liquid medicine in an inner space; a plunger disposed in the inside of the reservoir and moving along a longitudinal direction of the reservoir according to the amount of the liquid medicine stored in the reservoir; and a first sensor unit measuring the amount of the liquid medicine stored in the reservoir according to the movement of the plunger.

Description

Chemical injection device {Apparatus for Infusing medical liquid}

The present invention relates to a drug injection device.

In general, a drug injection device such as an insulin injection device is used to inject a drug solution into a patient's body. Although such a drug injection device is sometimes used by professional medical staff such as doctors or nurses, in most cases, it is used by ordinary people such as patients themselves or their guardians.

Diabetic patients, especially pediatric diabetic patients, need to inject a drug solution such as insulin into the body at a predetermined interval. A drug injection device in the form of a patch that is attached to the human body for a certain period of time has been developed, and the drug injection device can be used in a state of being attached in the form of a patch to the human body such as the abdomen or waist of a patient for a certain period of time.

In order to increase the effect through drug injection, the drug injection device needs to be controlled to precisely inject the drug into the patient's body.

When attached to the human body, the chemical injection device needs to be comfortable to wear, easy to use, durable, and operated with low power. In particular, since the drug injection device is used by being directly attached to the skin of a patient, it is important for the user to conveniently and safely drive the drug injection device.

The present invention provides a medicament injection device that can safely operate and accurately deliver a drug.

In one aspect of the present invention, a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and storing a chemical solution in an internal space, is disposed inside the reservoir, , a plunger moving along the longitudinal direction of the reservoir according to the amount of the chemical solution stored in the reservoir, and a first sensor unit for measuring the amount of the chemical solution stored in the reservoir according to the movement of the plunger. An injection device is provided.

In addition, the plunger may include a connector member mounted on one side and extending in one direction, and the first sensor unit may include a plurality of contact ends disposed on a movement path of the connector member.

In addition, the connector member may be electrically connected to at least one of the pair of contact terminals to sense a preset storage amount of the chemical solution.

In addition, the center of the contact end may be spaced apart from a center line in the longitudinal direction of the connector member, and when the connector member is linearly moved, a surface of the contact end may be in contact with the surface of the connector member.

The drug injection device according to an embodiment of the present invention may measure the injection amount of the chemical solution stored in the reservoir. The first sensor unit may measure the amount of the chemical solution stored in the reservoir to set the driving of the chemical solution injection device.

In the chemical injection device according to an embodiment of the present invention, when the chemical liquid is filled to some extent in the reservoir, it may be preheated to increase driving efficiency. When the first sensor unit senses that the amount of the chemical liquid injected into the reservoir is equal to or greater than the first reference amount, the chemical liquid injection device prepares to drive some parts in the first mode, and immediately when the chemical liquid injection device is attached to the user Medication can be injected.

When the chemical solution stored in the reservoir falls below a predetermined range, the chemical injection device according to an embodiment of the present invention may sense it and notify the user. When the first sensor unit senses that the amount of the chemical solution stored in the reservoir falls below or below the second reference amount, the chemical solution injection device drives the second sensor unit and/or the encoder unit to measure the amount of the chemical solution remaining in the reservoir. It is possible to precisely count and deliver information about this to the user. Of course, the scope of the present invention is not limited by these effects.

1 is a block diagram illustrating a chemical injection system according to an embodiment of the present invention.
2 is a perspective view illustrating a chemical injection device according to an embodiment of the present invention.
3 is an exploded perspective view of the chemical injection device of FIG. 2 .
4 is a perspective view showing a partial configuration of FIG. 3 .
FIG. 5 is a perspective view illustrating one side of FIG. 4 .
6 and 7 are plan views illustrating driving for sensing the flow rate of the reservoir.
FIG. 8 is a block diagram showing a partial configuration of the chemical liquid injection device of FIG. 2 .
9 to 12 are cross-sectional views illustrating driving of injecting a chemical solution into a reservoir to store the chemical solution, and discharging the chemical solution with a needle.
13 is a graph illustrating a change in an amount of a chemical and a change in a driving mode according to the driving of the chemical injection device.
14 is a plan view illustrating a part of a chemical injection device according to another embodiment of the present invention.

Since the present invention can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and when described with reference to the drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. .

In the following examples, the singular expression includes the plural expression unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have means that the features or components described in the specification are present, and the possibility that one or more other features or components will be added is not excluded in advance.

In cases where certain embodiments may be implemented otherwise, a specific process sequence may be performed different from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order opposite to the order described.

In the drawings, the size of the components may be exaggerated or reduced for convenience of description. For example, since the size and thickness of each component shown in the drawings are arbitrarily indicated for convenience of description, the following embodiment is not necessarily limited to the illustrated bar.

1 is a block diagram illustrating a chemical liquid injection system 1 according to an embodiment of the present invention.

Referring to FIG. 1 , the chemical injection system 1 may include a chemical injection device 10 , a user terminal 20 , a controller 30 , and a biometric information sensor 40 . In the chemical injection system 1 , a user can drive and control the system using the user terminal 20 , and based on blood glucose information monitored by the biometric information sensor 40 , the medicinal solution is injected from the chemical injection device 10 . It can be injected periodically.

The drug injection device 10 injects drugs to be injected to the user, such as insulin, glucagon, anesthetic, analgesic, dopamine, growth hormone, smoking cessation aid, etc., based on the data sensed by the biometric information sensor 40 It also performs functions.

In addition, the chemical injection device 10 may transmit a device status message including information on the remaining battery capacity of the device, whether the device is booted successfully, whether the injection is successful or the like, to the controller 30 . Messages transmitted to the controller may be transmitted to the user terminal 20 via the controller 30 . Alternatively, the controller 30 may transmit improved data processed by processing the received messages to the user terminal 20 .

In one embodiment, the drug injection device 10 is provided separately from the biometric information sensor 40, and may be installed to be spaced apart from the object. In another embodiment, the drug injection device 10 and the biometric information sensor 40 may be provided in one device.

In one embodiment, the drug injection device 10 may be mounted on the user's body. Also, in another embodiment, the drug injection device 10 may be mounted on an animal to inject the drug solution.

The user terminal 20 may receive an input signal from a user in order to drive and control the drug injection system 1 . The user terminal 20 may generate a signal for driving the controller 30 to control the controller 30 to drive the chemical injection device 10 . In addition, the user terminal 20 may display biometric information measured from the biometric information sensor 40 , and may display status information of the drug injection device 10 .

The user terminal 20 refers to a communication terminal that can be used in a wired/wireless communication environment. For example, the user terminal 20 may include a smartphone, a tablet PC, a PC, a smart TV, a mobile phone, a personal digital assistant (PDA), a laptop, a media player, a micro server, a global positioning system (GPS) device, an e-book terminal, It may be a terminal for digital broadcasting, a navigation system, a kiosk, an MP3 player, a digital camera, a home appliance, a device equipped with a camera, and other mobile or non-mobile computing devices. In addition, the user terminal 2 may be a wearable device such as a watch, glasses, a hair band and a ring having a communication function and a data processing function. However, as described above, a terminal equipped with an application capable of Internet communication may be borrowed without limitation.

The user terminal 20 may be connected one-to-one with the pre-registered controller 30 . The user terminal 20 may be encrypted and connected to the controller 30 in order to prevent the controller 30 from being driven and controlled by an external device.

In an embodiment, the user terminal 20 and the controller 30 may be separated from each other and provided as separate devices. For example, the controller 30 may be provided to the subject equipped with the drug injection device 10 , and the user terminal 20 may be provided to the subject or a third party. The user terminal 20 is driven by the guardian, thereby increasing the safety of the chemical injection system 1 .

In another embodiment, the user terminal 20 and the controller 30 may be provided as one device. The user terminal 20 and the controller 30 provided as one may communicate with the drug solution injection device 10 to control the drug injection.

The controller 30 performs a function of transmitting and receiving data to and from the drug solution injection device 10 , transmits a control signal related to injection of a drug such as insulin to the drug solution injection device 10 , and receives blood sugar from the biometric information sensor 40 . It is possible to receive a control signal related to the measurement of a biological value, such as.

The controller 30 may transmit, for example, an instruction request to measure the user's current state to the chemical liquid injection device 10 , and receive measurement data from the chemical liquid injection device 10 in response to the instruction request.

The biometric information sensor 40 may perform a function of measuring a user's biometric values, such as blood sugar, blood pressure, and heart rate, depending on the purpose. Data measured by the biometric information sensor 40 may be transmitted to the controller 30 , and a drug cycle and/or injection amount may be set based on the measured data. The data measured by the biometric information sensor 40 may be transmitted and displayed to the user terminal 20 .

For example, the biometric information sensor 40 may be a sensor that measures the blood glucose level of the object. It may be a continuous glucose monitoring (CGM) sensor. The continuous blood glucose measurement sensor may be attached to the object to continuously monitor the blood glucose level.

The user terminal 20 , the controller 30 and the drug injection device 10 may perform communication using a network. For example, a network includes a local area network (LAN), a wide area network (WAN), a value added network (VAN), a mobile radio communication network, a satellite communication network, and their It is a data communication network in a comprehensive sense that includes a mutual combination and enables each network constituent entity to communicate smoothly with each other, and may include a wired Internet, a wireless Internet, and a mobile wireless communication network. In addition, wireless communication is, for example, wireless LAN (Wi-Fi), Bluetooth, Bluetooth low energy, Zigbee, WFD (Wi-Fi Direct), UWB (ultra wideband), infrared communication (IrDA, infrared Data Association), NFC (Near Field Communication), 5G, etc. may be there, but is not limited thereto.

FIG. 2 is a perspective view showing a chemical injection device 10 according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of the chemical injection device 10 of FIG. 2 , and FIG. 4 is a partial configuration of FIG. is a perspective view, and FIG. 5 is a perspective view illustrating one side of FIG. 4 .

2 to 5 , the chemical injection device 10 may be attached to a user to inject a chemical solution, and may inject a chemical solution stored therein in a predetermined quantity to the user.

The chemical liquid injection device 10 may be used for various purposes according to the type of the chemical liquid to be injected. For example, the drug may include an insulin-based drug for diabetic patients, and may include other drugs for the pancreas, a drug for the heart, and other various kinds of drugs.

One embodiment of the drug injection device 10 may include a housing 11 covering the outside, and an attachment part 12 positioned adjacent to the user's skin. The chemical injection device 10 includes a plurality of parts disposed in an internal space between the housing 11 and the attachment part 12 . A separate bonding means may be further interposed between the attachment part 12 and the user's skin, and the drug injection device 10 may be fixed to the skin by the bonding means.

The chemical injection device 10 includes a needle assembly 100 , a reservoir unit 200 , a driving module 300 , a battery 350 , a driving unit 400 , a clutch unit 500 , a trigger member 600 , and a needle. It may include a cover assembly 700 , an alarm unit 800 , and a plurality of sensor units.

In the chemical injection device 10 , the base body may form a frame in which at least one body supports internal components. The base body may have a first body 13 , a second body 14 , and a third body 15 depending on the arrangement.

The first body 13 is disposed under the housing 11, and the needle assembly 100, the reservoir unit 200, the driving module 300, the battery 350, etc. can be supported in each opening or groove. there is. The second body 14 is disposed under the first body 13 and may be connected to the attachment part 12 . The second body 14 may cover a lower portion of the chemical injection device 10 . The third body 15 is disposed on the upper side of the first body 13 and supports the reservoir unit 200 , the driving module 300 , the battery 350 , the driving unit 400 , and the like in each opening or groove. can be In the drawings, the first body 13 , the second body 14 , and the third body 15 are illustrated, but the present invention is not limited thereto and may be provided integrally or in plurality.

The control module 16 may be disposed inside the chemical injection device 10 . A control module 16 , which is a circuit board, is disposed under the second body 14 , and may control overall driving of the chemical injection device 10 . The control module 16 may electrically contact the driving module 300 , the battery 350 , the alarm unit 800 , and the plurality of sensor units to control their driving.

The needle assembly 100 may be mounted on the first body 13 . The needle assembly 100 may be moved in the axial direction of the needle (N) and / or the cannula by rotation of the sleeve (110).

One end of the needle (N) may be connected to the reservoir unit 200 to deliver the drug, and the other end may be inserted into the cannula to move along the cannula.

Since the cannula has a conduit shape that can accommodate the needle (N), the drug solution discharged from the needle (N) can be injected to the user.

The cannula remains inserted into the user's skin, but the needle N rises and is separated from the subject. However, the cannula and the needle (N) form a path through which the fluid moves, so that the chemical solution injected from the reservoir 210 may be injected to the user through the needle (N) and the cannula.

The drug injection device 10 allows a user to simply rotate the needle assembly 100, insert the cannula into the subject, and start injecting the drug.

The reservoir unit 200 is mounted on the first body 13 and the third body 15 , and is connected to the needle assembly 100 . The reservoir unit 200 stores the chemical solution (D) in the internal space, and may move the chemical solution to the needle (N) in a fixed amount according to the movement of the plunger (230). The reservoir unit 200 may include a reservoir 210 , a cap cover 220 , a plunger 230 , a sealing ring 240 , and a connector member 250 (refer to FIG. 6 ).

The reservoir 210 may be extended to a predetermined length in the longitudinal direction, and may store the chemical solution in the internal space. Reservoir 210 may be discharged to the needle (N) by the movement of the plunger (230). A cap cover 220 is mounted at an end of the reservoir 210 , and the rod 410 and/or the connecting member 520 may move through an opening (not shown) disposed in the cap cover 220 ( FIG. 9).

The reservoir 210 may have an inlet end and an outlet end. A chemical solution is injected into the inlet end, and a needle (N) is installed at the outlet end, and the chemical solution may be discharged through the needle (N).

The plunger 230 is disposed inside the reservoir 210 and can move linearly by driving the driving module 300 and the driving unit 400 . As the plunger 230 advances, the chemical may be discharged from the inner space to the needle (N).

The plunger 230 may have an end end 231 and an inclined surface 232 . The end end 231 may move toward the front 210F of the reservoir 210 to move the chemical. The inclined surface 232 may be in close contact with the inclined portion of the reservoir 210 .

The plunger 230 may be connected to the connector member 250 extending rearward. The connector member 250 may be installed on the plunger 230 and may be linearly moved together according to the linear movement of the plunger 230 .

The connector member 250 may be made of a material having electrical conductivity and may have a shaft shape. As the connector member 250 moves and comes into contact with the first sensor unit 910A, a storage amount of the drug may be measured or the driving of the drug injection device 10 may be started.

The connector member 250 is connected to the rear end of the plunger 230 , and may move together with the movement of the plunger 230 . Although the drawing shows that the connector member 250 has a shaft shape, it is not limited thereto and may have various shapes for generating an electrical signal by making contact with the first sensor unit 910A.

When the chemical liquid is stored in the reservoir 210 and the plunger 230 is retracted, the connector member 250 may retract together with the plunger 230 . In addition, when the plunger 230 advances so that the chemical is discharged from the reservoir 210 to the needle N, the connector member 250 may advance together with the plunger 230 .

The plunger 230 is provided with a sealing portion 240 in a portion in contact with the inner wall of the reservoir 210, it is possible to prevent leakage of the chemical when the plunger 230 is moved.

The driving module 300 may generate a driving force and transmit the driving force to the driving unit 400 . The driving force transmitted by the driving unit 400 may linearly move the plunger 230 inside the reservoir 210 to discharge the chemical.

When the driving units 400 are engaged with each other by the clutch unit 500 , the driving module 300 rotates the driving wheel 420 of the driving unit 400 , and is loaded with the rotation of the driving wheel 420 . 410 may move linearly, so that the plunger 230 may move. When the plunger 230 moves, the connector member 250 may also move linearly.

As the driving module 300 , all kinds of devices having a chemical liquid suction power and a chemical liquid discharge power can be used by electricity. For example, all kinds of pumps such as mechanical displacement type micropumps and electromagnetic motion type micropumps can be used. A mechanical displacement micropump is a pump that uses the motion of a solid or fluid, such as a gear or diagram, to generate a pressure difference to induce the flow of a fluid. Diaphragm displacement pump, fluid displacement pump ), and a rotary pump. Electromagnetic motion micropumps are pumps that directly use electrical or magnetic energy to move a fluid. Electrohydrodynamic pumps (EHD), electroosmotic pumps, magnetohydrodynamic pumps ( Magneto hydrodynamic pump), electrowetting pump, etc.

The battery 350 may supply electricity to the chemical injection device 10 to activate each component. Although the drawing shows a pair of batteries 350 , the present invention is not limited thereto, and may be set in various ways according to the capacity, use range, use time, etc. of the chemical injection device 10 .

The battery 350 is disposed adjacent to the driving unit 400 and may supply electricity to the driving unit 400 . In addition, the battery 350 is connected to the control module 16, and based on the electrical signal measured by the sensor unit, the rotation speed or rotation speed of the driving unit 400, the amount of chemical stored in the reservoir 210, and the user It is possible to measure data on the amount of the injected drug solution, etc.

Referring to FIG. 9 , the driving unit 400 is installed between the driving module 300 and the reservoir unit 200, and a plunger ( 230) can be moved. However, the driving unit 400 can move the plunger 230 forward only when the rod 410 and the driving wheel 420 are coupled or connected by the clutch unit 500 .

The rod 410 is connected to the plunger 230 and extends in one direction. The rod 410 is inserted into the opening of the cap cover 220 , and the rod 410 may move in the longitudinal direction of the reservoir 210 to move the plunger 230 . The rod 410 may have a screw thread shape on the surface. The rod 410 is inserted into the connection member 520 , and when the liquid is quantitatively discharged, the rod 410 is connected to the driving wheel 420 by the clutch unit 500 so that the rod 410 can move forward.

The driving wheel 420 is drivably connected to the driving module 300 , and may be rotated by the driving of the driving module 300 . The driving wheel 420 has a first connection end 421 and a second connection end 422 , and may have a space inside which the rod 410 can move. Since at least one of the first connection end 421 and the second connection end 422 is always drivably connected to the driving module 300 by the connector CN, the driving wheel 420 is driven by the driving module 300 . ) can be rotated.

In one embodiment, the first connecting end 421 and the second connecting end 422 may have a gear tooth shape. The connector CN connected to the driving module 300 may apply gear teeth to rotate the driving wheel 420 .

In detail, the connector CN rotates repeatedly based on the rotation axis according to the linear reciprocating motion of the driving module 300 . The end of the connector CN may apply at least one of the first connecting end 421 and the second connecting end 422 to rotate the driving wheel 420 . For example, one end of the connector CN may be disposed to apply the first connection end 421 , and the other end of the connector CN may be disposed to apply the second connection end 422 .

When the connector CN rotates about the rotation axis, the second sensor unit 920 may measure the driving of the connector CN. The second sensor unit 920 may measure whether the driving force of the driving module 300 is transmitted to the driving wheel 420 by measuring whether or not it is in contact with the connector CN. Also, the second sensor unit 920 may measure the rotation angle of the driving wheel 420 by measuring whether or not it is in contact with the connector CN.

The clutch unit 500 may drive the driving module 300 and the driving unit 400 . The clutch unit 500 is disposed between the rod 410 and the driving wheel 420 , and may include a coupler 510 and a connecting member 520 .

The coupler 510 is disposed on the outside of the connecting member 520, and is spaced apart from the connecting member 520 by a predetermined distance when inactive ( FIGS. 9 and 10 ), and when activated, the rod 410 and the driving wheel ( 420) can be connected (FIGS. 11 and 12). The coupler 510 is a component capable of urging the outside of the connecting member 520 with an elastic force, and is not limited to a specific shape. However, hereinafter, for convenience of description, the case of the spring type will be mainly described.

At least a portion of the connecting member 520 may be disposed to be inserted into the rod 410 . The connecting member 520 is disposed to cover the outside of the rod 410 . The connecting member 520 may connect the driving module 300 and the rod 410 according to the operation of the coupler 510 .

In one embodiment, the rod 410 and the connecting member 520 may have the form of a screw and a screw thread, respectively. A screw thread is formed on the outer circumferential surface of the rod 410 , and a screw thread is formed on the inner circumferential surface of the connecting member 520 to be connected in a screw-coupled manner.

In one embodiment, the connecting member 520 may have a thread formed on the inner circumferential surface at one end, but the thread may not be disposed on the other end.

Referring to FIG. 9 , a thread is formed on an inner circumferential surface of the first section L1 of the connecting member 520 , and is screw-coupled to the rod 410 only in the first section L1 . Also, the diameter of the first section L1 may correspond to the rod 410 and may have a size D1.

In the second section L2 of the connecting member 520 , a screw thread is not formed on the inner circumferential surface. Also, the diameter D2 of the second section L2 may be set to be larger than the diameter D1 of the first section L1 . In the second section L2 , the connecting member 520 does not contact the rod 410 .

The length of the first section L1 may be set to overlap the coupler 510 when the connecting member 520 moves backward. 10 and 11 , when the plunger 230 extends rearward, at least a portion of the first section L1 overlaps the coupler 510 , that is, at least a portion is disposed to face the coupler 510 . do. When the coupler 510 is activated, the length of the first section L1 in the connecting member 520 may be set such that the coupler 510 grips at least a portion of the first section L1 .

Since the rod 410 is screwed only in the first section L1 of the connecting member 520, when the connecting member 520 rotates to move the rod 410 forward, the connecting member 520 and the rod ( 410), it is possible to reduce the load due to the screw coupling.

11 and 12 , when the coupler 510 is activated, the coupler 510 grips the connecting member 520 , and the connecting member 520 also rotates according to the rotation of the driving wheel 420 . Since the connecting member 520 and the rod 410 are screwed only in the first section L1, even when the driving wheel 420 rotates with a small torque, the connecting member 520 moves the rod 410 forward. can That is, since the rod 410 and the connecting member 520 are screwed only in the first section L1 , the plunger 230 by the driving of the driving unit 400 can move forward even by a rather weak force.

The trigger member 600 may generate a mechanical signal into which the chemical of the chemical injection device 10 is injected. The trigger member 600 is rotatably disposed on one side of the third body 15 , and the trigger member 600 rotates to start driving the driving module 300 , and at the same time, the clutch unit 500 operates the driving unit ( 400) can be driven.

The trigger member 600 may rotate in one direction about a rotation axis. At this time, the trigger member 600 may apply the clutch unit 500 to couple the rod and the driving wheel 420 .

In detail, when the user rotates the needle assembly 100 , the knob of the needle assembly 100 applies an end of the trigger member 600 , so that rotation of the trigger member 600 may be started. When the trigger member 600 rotates, the trigger member 600 applies an end of the coupler 510 , and the coupler 510 is coupled to the connection member 520 to activate the clutch unit 500 .

The needle cover assembly 700 may be mounted under the needle assembly 100 . The needle cover assembly 700 may prime the air stored in the reservoir unit 200 before injecting the chemical solution. When the chemical liquid enters the reservoir 210 through the chemical injector NI, the gas (air) remaining in the reservoir 210 may be discharged to the outside.

The needle cover assembly 700 may include a first cover 710 , a second cover 720 , a filter member 730 , and an adhesive layer 740 .

The first cover 710 may be disposed under the chemical injection device 10 . The second cover 720 may be inserted into the opening of the first cover 710 to be assembled. An insertion protrusion 911 inserted into the second body 14 to fix the needle cover assembly 900 may be disposed on one side of the first cover 710 .

The second cover 720 is assembled to the first cover 710, the needle (N) and / or cannula may be aligned in the center. The second cover 720 is penetrated in the center in the height direction, and may have a storage space in which the chemical solution (D) is stored.

The first cover 710 has greater rigidity than the second cover 720 . The first cover 710 is a portion exposed to the outside, and is formed of a material having a rather high rigidity. The second cover 720 is assembled to the first cover 710 , and is formed of a material having less rigidity than the first cover 710 in order to be inserted into the opening of the second body 14 .

A protrusion 721 inserted into the second body 14 may be provided at the center of the second cover 720 . In addition, the second cover 720 has a fixing protrusion 722 , and the fixing protrusion 722 is inserted into the first cover 710 , so that the first cover 710 and the second cover 720 are assembled. can

The filter member 730 is mounted on the second cover 720 . The filter member 730 is disposed under the storage space of the second cover 720 , and a gas such as air passes through the filter member 730 , but a liquid such as a chemical does not pass through the filter member 730 . Thus, the air discharged from the needle (N) passes through the filter member 730 and is discharged to the outside, but the chemical solution discharged from the needle is stored in a storage space defined by the second cover 720 and the filter member 730. can

The filter member 730 may change in shape depending on the amount of the chemical stored in the storage space. For example, when the chemical solution is filled in the storage space, the filter member 730 expands downward, so that the user can recognize that the chemical solution is introduced into the needle cover assembly 700 .

The adhesive layer 740 is disposed on one surface of the needle cover assembly 700 , and may attach the needle cover assembly 700 to the attachment part 12 .

The alarm unit 800 is disposed inside or outside the chemical injection device 10 , and may notify a user of a normal operation or a malfunction of the chemical injection device 10 .

For example, the alarm unit 800 is disposed under the housing 11 and is connected to a circuit board. The alarm unit 800 may transmit an alarm to an external user by generating a warning sound or light.

6 and 7 are plan views illustrating driving for sensing the flow rate of the reservoir 210 , and FIG. 8 is a block diagram illustrating a partial configuration of the chemical liquid injection device 10 of FIG. 2 .

4 to 8 , the plurality of sensor units may measure the driving of the chemical liquid injection device 10 . The plurality of sensor units measure the amount of chemical stored in the reservoir 210 , whether the driving module 300 is driven, whether the driving unit 400 is driven, the rotation angle of the driving wheel 420 , and the plunger 230 . The distance traveled can be measured.

The sensor units may each have a plurality of contact ends. The contact end may measure each event or data by measuring whether or not there is an electrical contact.

The contact end may change the position of any one end due to contact with other parts, and may return to its original position by restoring force when contact with other parts is released.

In one embodiment, the contact end may have an elastic spring shape. The contact end may have a first end 900A connected to the control module 16 that is a circuit board, and a second end 900B extending from the first end 900A to be in contact with the connector member 250 .

A diameter of the first end 900A may be set to be larger than a diameter of the second end 900B. Since the first end 900A has a larger diameter than the second end 900B, the first end 900A may be firmly supported on the circuit board. The first end 900A may be stably supported by the control module 160 , and the second end 900B may be easily deformed in position or shape to stably maintain contact with other components.

The length of the first end 900A may be set to be smaller than the length of the second end 900B. Since the length of the first end 900A is shorter than the length of the second end 900B, the first end 900A may be firmly supported on the circuit board. The first end 900A may be stably supported by the control module 160 , and the second end 900B may be easily deformed in position or shape to stably maintain contact with other components.

In particular, since the diameter of the second end 900B is smaller than the diameter of the first end 900A, or the length of the second end 900B is set longer than the length of the first end 900A, the second end 900B ) is in contact with other components such as the connector member 250 and the base cover 933 , the second end 900B is easily deformed in position or shape, and can stably maintain contact with other components.

The first sensor unit 910A is disposed adjacent to the reservoir unit 200 . The first sensor unit 910A may be disposed on a movement path of the connector member 250 . The first sensor unit 910A may have a plurality of contact ends, and the plurality of contact ends may be mounted in the fixing groove 14A of the second body 14 . As the connector member 250 moves, it may come into contact with at least one of the plurality of contact ends.

In an embodiment, the first sensor unit 910A may include a first contact end 911 and a second contact end 912 . The first contact end 911 and the second contact end 912 are disposed to be spaced apart from each other, and the connector member 250 linearly moves to make contact with the first contact end 911 and/or the second contact end 912 . can do.

The connector member 250 may contact the first contact end 911 at the first position P1 and may contact the second contact end 912 at the second position P2 .

6, 9 and 10, in the process in which the chemical solution D is injected into the reservoir 210, the connector member 250 first contacts the first contact end 911 at the first position P1. and (the plunger 230 is at the P-1 position), and thereafter, the connector member 250 comes into contact with the second contact end 912 at the second position P2 (the plunger 230 is at the P-2 position).

In an embodiment, the connector member 250 may electrically connect the first contact end 911 and the second contact end 912 . When the first contact terminal 911 and the second contact terminal 912 are electrically connected through the connector member 250 , the control module 16 may recognize a specific event of the reservoir unit 200 .

For example, when the connector member 250 comes into contact with the first contact end 911 and the second contact end 912 , the first sensor unit 910A transmits the chemical stored in the reservoir 210 to a first reference amount (for example, 10%, 20%, 30%, etc.) can be sensed.

When recognizing that the chemical solution D is stored in the reservoir 210 as the set first reference amount, the control module 16 may AWAKE the chemical solution injection device 10 . That is, the control module 16 may confirm that a certain amount of the chemical solution is stored in the reservoir 210 , and start some driving to preheat the chemical solution injection device 10 (first mode).

In another embodiment, the connector member 250 may contact at least one of the contact ends of the first sensor unit 910A to generate an electrical signal. When the connector member 250 contacts the first contact end 911 , the control module 16 recognizes the first event, and when the connector member 250 contacts the second contact end 911 , the control module 16 . may recognize the second event.

For example, the connector member 250 may come into contact with the first contact end 911 to wake up the chemical injection device 10 , and contact the second contact end 912 of the chemical solution stored in the chemical injection device 10 . Storage can be sensed.

For example, the connector member 250 may come into contact with the first contact terminal 911 to wake up the chemical injection device 10 , and the amount of the chemical stored in the reservoir 210 may be primarily sensed, and the second contact terminal ( 912) and the storage amount of the chemical stored in the chemical injection device 10 may be sensed secondarily.

6, 11 and 12, in the process in which the chemical solution D is discharged to the needle N, the connector member 250 is first released from contact with the second contact end 912 at the second position P2, and (The plunger 230 is at the P-2 position), and then the connector member 250 is released from contact with the first contact end 911 at the first position P1 (the plunger 230 is at the P-1 position) .

In one embodiment, when the connector member 250 maintains contact with the first contact end 911 and the second contact end 912 and the contact of the second contact end 912 is separated, the first contact end ( The electrical connection between 911) and the second contact terminal 912 is released. When the first contact terminal 911 and the second contact terminal 912 are electrically disconnected from each other, the control module 16 may recognize a specific event of the reservoir unit 200 .

In detail, when the second contact terminal 912 is separated, the control module 16 may generate a signal that the chemical solution D stored in the reservoir 210 is not sufficient. The control module 16 generates an alarm signal and transmits the alarm signal to the controller 30 , the user terminal 20 and/or the alarm unit 800 , so that the user can recognize the amount of the chemical.

In addition, when the third mode is set in the chemical injection device 10 , the advance distance of the plunger 230 in the reservoir 210 using the second sensor unit 920 and/or the encoder unit 930 . is accurately measured, and it is possible to precisely measure and monitor the amount of the chemical solution stored in the reservoir 210 .

In another embodiment, the connector member 250 may release contact with at least one of the contact ends of the first sensor unit 910A to recognize different events. When the connector member 250 releases contact with the second contact end 912 , the control module 16 recognizes the third event, and the connector member 250 releases the contact with the first contact end 911 . Then, the control module 16 may recognize the fourth event.

For example, when the connector member 250 releases contact with the second contact terminal 912 , the control module 16 may transmit an alarm signal to the user, and when the contact with the first contact terminal 911 is released , the control module 16 may forcibly terminate the chemical injection device 10 , generate an alarm signal continuously to the user terminal 20 , reduce the amount of the chemical solution injected to the user, or increase the injection cycle.

Referring to FIG. 6 , the first sensor unit 910A may be spaced apart from the center line CL in the longitudinal direction of the connector member 250 , and the surface of the contact end may be disposed in contact with the surface of the connector member 250 .

The connector member 250 extends based on the center line CL, and linearly moves along the center line CL. In addition, the outer peripheral surface of the connector member 250 is spaced apart from the center line CL by a length of t1. The centers of the plurality of contact ends are spaced apart from the center line CL by t2, and the surfaces of the plurality of contact ends are spaced apart from the center line CL by t3.

Since the size of t1 is set to be larger than the size of t3, when the connector member 250 moves rearward along the center line CL, it comes into contact with the first contact end 911 at the point of P1, and comes into contact with the first contact end 911 at the point of P2. 2 may be in contact with the contact end 912 . In addition, when the connector member 250 moves forward along the center line CL, the contact with the second contact end 912 is released at a point P2, and the contact with the first contact end 911 at a point P1 is released. can be

The second sensor unit 920 may sense whether the driving module 300 and/or the driving unit 400 is being driven. The driving module 300 and the driving wheel 420 are drivably connected by a connector CN. When the driving module 300 moves linearly, the connector rotates repeatedly about the rotation axis, and both ends of the connector CN connect the first connecting end 421 and the second connecting end 422 of the driving wheel 420 . The driving wheel 420 rotates by applying it alternately. The second sensor unit 920 may measure whether the connector CN rotates about a rotation axis and the number of rotations.

The second sensor unit 920 may measure the moving distance of the plunger 230 , the discharge amount of the chemical solution discharged through the needle N, and the amount of the chemical solution remaining in the reservoir 210 . The second sensor unit 920 measures how much the connector CN rotates the driving wheel 420 . When the rotation angle of the driving wheel 420 is measured by the second sensor unit 920, the linearly moved distance of the plunger 230 can be calculated, and the distance discharged from the reservoir 210 through the moving distance can be calculated. The chemical solution and the chemical solution remaining in the reservoir 210 may be measured.

The second sensor unit 920 may have a 1A contact end 921 and a 2A contact end 922 . When the connector CN contacts the 1A contact end 921 , the second sensor unit 920 indicates that the connector CN applies any one of the first connecting end 421 and the second connecting end 422 . measured as In the second sensor unit 920 , when the connector CN contacts the 2A contact end 922 , the connector CN applies the other one of the second connecting end 422 and the second connecting end 422 . measured as

The encoder unit 930 may be disposed at one end of the driving unit 400 to measure the rotation of the driving unit 400 . The encoder unit 930 may measure the rotation of the driving wheel 420 .

The encoder unit 930 may have a 1B contact end 931 , a 2B contact end 932 , and a base cover 933 having a cover end 933A and a tooth end 933B.

The 1B contact end 931 may be disposed at an end of the base cover 933 to always maintain contact with the base cover 933 . The 1B contact end 931 may selectively maintain contact with the cover end 933A.

In the drawings, the 1B contact end 931 is shown disposed on the opposite side of the 2B contact end 932 , but is not limited thereto. For example, the 1B contact end 931 and the 2B contact end 932 may be disposed on the same side of the driving wheel 420 . In addition, the 1B contact end 931 may be disposed at the rear of the driving wheel 420 .

The 2B contact end 932 is disposed at an end of the base cover 933 , and is spaced apart from the 1B contact end 931 . The 2B contact end 932 is disposed to contact the tooth end 933B, and may be brought into contact or released from contact according to the rotation of the driving wheel 420 .

The base cover 933 is inserted into one end of the driving wheel 420 . The cover end 933A extends around the outer circumferential surface of the driving wheel 420, but the tooth end 933B extends from the cover end 933A, and a plurality of them may be disposed to be spaced apart along the outer circumferential surface of the driving wheel 420. . The tooth end 933B may extend along the longitudinal direction of the driving wheel 420 from the cover end 933A.

In an embodiment, the width W1 of the tooth ends 933B may be set to be smaller than the distance W2 between adjacent tooth ends. Since the width of W1 is set to be greater than the width of W2, the second B contacting end may reduce an error generated when it comes into contact with the tooth 933B.

The encoder unit 930 may sense the rotation of the driving wheel 420 to measure whether the second sensor unit 920 is being properly driven. When the rotation of the driving wheel 420 is measured by the encoder unit 930 when the chemical injection device 10 operates normally, the contact of the connector CN should also be made in the second sensor unit 920 . When it is measured that the driving wheel 420 does not rotate in the encoder unit 930 , the contact of the connector CN should not occur even in the second sensor unit 920 . Accordingly, by comparing the signal measured by the encoder unit 930 with the signal measured by the second sensor unit 920 , the encoder unit 930 may check the error of the second sensor unit 920 .

When the 2B contact end 932 contacts the tooth end 933B, the 1B contact end 931 and the 2B contact end 932 are electrically connected, and the encoder unit 930 senses an electrical connection signal. . When the driving wheel 420 further rotates and the 2B contact end 932 is separated from the tooth end 933B, the 2B contact end 932 is electrically disconnected. The encoder unit 930 measures the number of times of electrical connection and disconnection between the 1B contact terminal 931 and the 2B contact terminal 932 and the number of times to measure the rotation angle and rotation speed of the driving wheel 420. can

9 to 12 are cross-sectional views illustrating driving of injecting a chemical solution into the reservoir 210 to store the chemical solution and discharging the chemical solution to the needle N, and FIG. It is a graph showing the change of the chemical liquid amount and the change of the driving mode.

9 to 13 , before attaching the chemical injection device 10 to the user, the chemical solution D is stored in the reservoir 210 , and then the chemical solution D is transferred from the reservoir 210 to the needle N. ) and injecting the chemical solution (D) to the user will be described as follows.

<Drug storage stage>

The user injects the chemical into the reservoir unit 200 of the chemical injection device 10 using an external chemical injector (not shown). Referring to FIG. 9 , the plunger 230 is disposed at the front end of the reservoir 210 before the chemical solution is injected, and the rod 410 is assembled to the connecting member 520 at the rear end of the plunger 230 . At this time, since the coupler 510 does not grip the connecting member 520 , the driving wheel 420 is not connected to the rod 410 .

The user puts the chemical liquid D to be injected into the chemical liquid injector (not shown), and inserts the chemical liquid injector into the inlet end of the reservoir unit 200 . In this case, the air remaining inside the reservoir 210 may be primed.

In detail, during the assembly process of the reservoir unit 200 , air remains between the reservoir 210 and the plunger 230 . If the chemical is injected while the air remains in the reservoir 210 , there is a risk that air is also injected into the user, so an operation (priming operation) of removing the air is required.

When the chemical begins to flow into the reservoir 210 from the chemical injector, the remaining gas is pushed between the inner surface of the reservoir 210 and the plunger 230 and the remaining gas is pushed by the needle N. At this time, the gas may move along the guide groove 211 . That is, the gas remaining inside the reservoir 210 may be discharged to the needle N along the guide of the guide groove 211 by the introduced chemical D. The gas that has passed through the needle (N) moves to the needle cover assembly (700), passes through the filter member (730) of the needle cover assembly (700), and is discharged to the outside. By the guide of the guide groove 211 , the gas remaining inside the reservoir 210 is quickly discharged to the outside, so that the gas in the reservoir 210 can be removed.

The first sensor unit 910A may be driven according to the amount of the chemical D injected into the reservoir 210 .

When the plunger 230 passes through the point P-1 according to the injection of the chemical D, the connector member 250 comes into contact with the first contact end 911 at the first position P1. Thereafter, when the plunger 230 passes through the point P-2, the connector member 250 comes into contact with the second contact end 912 at the second position P2.

In one embodiment, when the connector member 250 electrically connects the first contact end 911 and the second contact end 912 , the first mode is driven. The first mode is an AWAKE mode for waking up the chemical injection device 10 , and thereafter, when the chemical injection device 10 is attached to the user, the chemical injection device 10 may be preheated to be driven immediately. In addition, by notifying the user that the first reference amount of the chemical solution D is stored in the reservoir 210 through the user terminal 20 or the like, it is possible to inform the user in advance to use the chemical solution injection device 10 .

In another embodiment, when the connector member 250 is connected to the first contact terminal 911, the control module 16 recognizes it as a first event, and when the connector member 250 is connected to the second contact terminal 912, the control module 16 is It may be recognized as the second event. That is, when the connector member 250 comes into contact with each of the different contact ends, different events may be recognized and the events may be transmitted to the user.

<Attachment Step>

As shown in FIG. 10 , when the drug D is stored in the reservoir 210 , the drug injection device 10 is attached to the user. Since the gas in the reservoir 210 is removed (priming operation is completed) through the needle cover assembly 700 in the above-described drug storage step, the needle cover assembly 700 is removed from the drug injection device 10 .

The user attaches the drug injection device 10 to the user, rotates the needle assembly 100, and inserts the needle N and the cannula into the skin. The needle (N) is inserted into the skin together with the cannula, and can induce the cannula to be inserted into the skin.

Afterwards, the needle (N) is withdrawn from the skin, maintaining a state connected to the cannula. When the user further rotates the needle assembly 100, the needle N moves upward while the cannula is inserted into the skin. At least a part of the cannula and the needle (N) is connected, and forms and maintains a path through which the drug solution moves.

<Drug injection phase-second mode>

At substantially the same time as the operation in which the cannula and the needle (N) are inserted into the user, the driving module 300 and the driving unit 400 are driven. The chemical liquid injection device 10 may be injected to the user according to a set cycle and injection amount of the chemical liquid D in the second mode.

When the user rotates the needle assembly 100 to insert the needle N and the cannula into the skin, the trigger unit 600 drives the driving module 300 . When the driving module 300 is driven, the connector CN rotates about the rotation axis to rotate the driving wheel 420 . The connector CN may rotate the driving wheel 420 in units of one tooth while alternately applying the first connecting end 421 and the second connecting end 422 .

When the user rotates the needle assembly 100, the trigger unit 600 may activate the coupler 510 as shown in FIG. 11 . When the coupler 510 grips the outside of the connecting member 520 , the driving wheel 420 , the coupler 510 , and the connecting member 520 are integrated into one body. Accordingly, when the driving wheel 420 rotates, the connecting member 520 also rotates, and the rod 410 moves forward.

When the rod 410 moves forward, the plunger 230 also moves forward together, and the chemical may be discharged to the needle (N). Accordingly, the drug may be injected to the user according to the set driving cycle and driving speed of the driving module 300 .

In this case, the second sensor unit 920 may measure the rotation of the connector CN. The 1A contact end 921 and the 2A contact end 922 of the second sensor unit 920 alternately contact the end of the corresponding connector CN. The second sensor unit 920 senses that the 1A contact end 921 and one end of the connector CN come into contact, and senses that the second 2A contact 922 and the other end of the connector CN come into contact with each other.

As an embodiment, when the contact end of the second sensor unit 920 and the connector CN come into contact, the second sensor unit 920 may sense an electrical signal. In another embodiment, when the contact end of the second sensor unit 920 and the connector CN come into contact, the second sensor unit 920 may sense an impact signal according to the impact.

The second sensor unit 920 measures whether the driving module 300 and the connector CN are driven on the basis of the data measuring the rotation of the connector, or determines whether the driving wheel 420 is driven by the connector CN. It is possible to measure, measure the rotation angle and/or rotation speed of the driving wheel 420 , or measure the moving distance of the plunger 230 and the injection amount of the chemical solution by the rotation of the driving wheel 420 .

When the driving wheel 420 rotates, the encoder unit 930 may measure a rotation angle, rotation speed, etc. of the driving wheel 420 . The 1B contact end 931 maintains electrical contact with the cover end 933A, but the 2B contact end 932 maintains electrical contact with the tooth end 933B, but is in electrical contact with the tooth end 933B. This can be turned off.

The encoder unit 930 may measure data related to rotation of the driving wheel 420 by electrically measuring a connection signal and/or an electrically releasing signal. The control module 16 calculates the rotation angle and rotation speed of the driving wheel 420 based on the data measured by the encoder unit 930, and based on this, the movement distance of the plunger 230 and the discharge amount of the chemical can be calculated. there is.

<Drug injection phase - 3rd mode>

When the plunger 230 is positioned at the P-2 position and the connector member 250 is positioned at the second position P2, the first contact end 911 and the second contact end 912 in the first sensor unit 910A ) is electrically isolated. The control module 16 may activate the third mode when the first sensor unit 910A is electrically released.

In the third mode, the control module 16 may transmit an alarm signal indicating that the amount of the stored chemical corresponds to the second reference amount to the user through the user terminal 20, the controller 30, and/or the alarm unit 800. . The second reference amount may be defined as an amount of the chemical recognized by the driving module 300 at the time of driving in the third mode. The control module 16 transmits to the user that the amount of the chemical solution remaining in the reservoir 210 is a preset second reference amount, so that the user can prepare to replace the chemical solution injection device 10 .

In one embodiment, the first reference amount may be set to the same amount of storage of the drug solution as the second reference amount. When the plunger 230 moves forward or backward and the connector member 250 contacts or releases the contact with the second contact end 912 , the position of the plunger 230 in the reservoir 210 is the same, so the first The first reference amount and the second reference amount may be set to be the same.

In another embodiment, the first reference amount may be set to a storage amount of the chemical greater than the second reference amount. The first reference amount is a reference value set for driving the first mode, and may be set to be substantially equal to the amount of the chemical solution stored in the reservoir 210 . The second reference amount is the amount of the chemical recognized by the driving module 300 at the start time of the third mode, and may be set to be less than the amount of the chemical liquid actually remaining in the reservoir 210 to have a margin.

Since the second reference amount is set to be smaller than the amount of the chemical solution stored in the actual reservoir 210 , the actual reservoir 210 has a margin corresponding to the difference between the actual amount of the chemical solution remaining and the second reference amount. Even if the chemical injection device 10 informs that there is no chemical solution, the chemical solution remaining in the reservoir 210 can be further used, thereby eliminating abrupt disconnection or accident of the chemical solution, thereby increasing the safety of the chemical solution injection device 10 there is.

Since the remaining amount of the chemical is important in the third mode, the control module 16 may calculate the injection amount of the chemical and the remaining amount of the chemical in the reservoir 210 very precisely in the third mode. In the third mode, based on the data acquired from the second sensor unit 920 and the encoder unit 930, the control module 16 accurately determines the rotation angle of the driving wheel 420 and the distance the plunger 230 moves. By measuring, the discharge amount of the chemical and the amount of the chemical remaining in the reservoir 210 can be precisely calculated. In the third mode, the accurately calculated residual amount of the chemical is transmitted to the user in real time, so that the user can recognize the risk.

In one embodiment, the chemical liquid injection device 10 may accurately count the amount of the chemical liquid remaining in the reservoir 210 only in the third mode. In the second mode, since the amount of the chemical solution stored in the reservoir 210 exceeds a preset range (ie, the second reference amount), the amount of the chemical solution in the reservoir 210 is not precisely counted, but in the third mode, the The amount of the chemical stored in 210 can be counted quantitatively. Since the amount of the chemical stored in the chemical injection device 10 is precisely counted only at a level that requires an alarm, the control load of the chemical injection device 10 can be reduced.

The chemical injection device 10 according to an embodiment of the present invention may measure the injection amount of the chemical solution stored in the reservoir 210 . The first sensor unit 910A may measure the amount of the chemical solution stored in the reservoir 210 to set the driving of the chemical solution injection device 10 . When the plunger 230 linearly moves inside the reservoir 210 , the connector member 250 connected to the plunger 230 also moves to contact or release contact with the first sensor unit 910A, and the reservoir 210 ) can sense the amount of drug stored in the

When the chemical liquid is filled in the reservoir to some extent, the chemical liquid injection device 10 according to an embodiment of the present invention may be preheated to increase driving efficiency. When the first sensor unit 910A senses that the amount of the chemical injected into the reservoir 210 is equal to or greater than the first reference amount, the chemical injection device 10 prepares to drive some parts in the first mode, When the chemical solution injection device 10 is attached to the user, the chemical solution can be injected immediately.

When the chemical solution stored in the reservoir 210 falls below a predetermined range, the chemical injection device 10 according to an embodiment of the present invention may sense it and notify the user. When the first sensor unit 910A senses that the amount of the chemical solution stored in the reservoir 210 falls below or below the second reference amount, the chemical solution injection device 10 is configured with the second sensor unit 920 and/or the encoder By driving the unit 930 , the amount of the chemical remaining in the reservoir 210 may be precisely counted, and information about this may be transmitted to the user.

14 is a plan view illustrating a part of a chemical injection device according to another embodiment of the present invention.

Referring to FIG. 14 , the chemical injection device 10 may include a first sensor unit 910A having a plurality of contact ends. Although the drawing shows that the first sensor unit 910A has four contact ends, it is not limited thereto and various numbers may be set.

The first sensor unit 910A may have a first contact end 911 , a second contact end 912 , a third contact end 913 , and a fourth contact end 914 .

The first to fourth contact terminals 911-914 may be disposed adjacent to each other. The connector member 250 may contact at least one of the first to fourth contact terminals 911-914 to sense the amount of the chemical solution stored in the reservoir 210 .

In an embodiment, when the connector member 250 electrically connects the first contact terminal 911 and the second contact terminal 912 , the first sensor unit 910A senses an electrical signal, and the reservoir 210 ) is estimated to contain as much chemical as A. When the connector member 250 electrically connects the third contact terminal 913 and the fourth contact terminal 914 , the first sensor unit 910A senses an electrical signal, and the reservoir 210 receives a larger than A It is estimated that the amount of chemical solution B is stored.

In another embodiment, when the connector member 250 comes into contact with the first contact end 911 , the first sensor unit 910A senses an electrical signal, and it is estimated that the reservoir 210 stores the amount of chemical A′. do. When the connector member 250 comes into contact with the second contact end 912 , the third contact end 913 , and the fourth contact end 914 , the first sensor unit 910A is B′, C′, D′, respectively. It can be estimated that the drug solution is stored in the reservoir 210 .

In an embodiment, the first to fourth contact ends 911-914 may be disposed at the same distance from each other.

In another embodiment, the distance between the first to fourth contact ends 911-914 may be set differently. The gap between the first contact end 911 and the second contact end 912 , the gap between the second contact end 912 and the third contact end 913 , and the third contact end 913 and the fourth The amount of the chemical stored in the reservoir 210 may be variously sensed by setting the interval between the contact ends 914 differently, or by setting at least one differently.

The spirit of the present invention should not be limited to the above-described embodiments, and not only the claims described below, but also all ranges equivalent to or changed from these claims are within the scope of the spirit of the present invention. will be said to belong

1: Drug injection system
10: drug injection device
100: needle assembly
200: reservoir unit
300: drive module
400: drive unit
500: clutch unit
600: no trigger
700: needle cover assembly
800: alarm unit

Claims (4)

base body;
a needle assembly mounted on the base body;
a reservoir fluidly connected to the needle assembly and storing a chemical solution in the internal space;
a plunger disposed inside the reservoir and moving along a longitudinal direction of the reservoir according to the amount of the chemical stored in the reservoir; and
A medicament injection device comprising a; a first sensor unit for measuring the amount of the medicament stored in the reservoir according to the movement of the plunger. According to claim 1,
The plunger includes a connector member mounted on one side and extending in one direction,
The first sensor unit is
A chemical injection device having a plurality of contact ends disposed on a movement path of the connector member. 3. The method of claim 2,
The connector member is
A chemical solution injection device electrically connected to at least one of the pair of contact terminals to sense a preset storage amount of the chemical solution. 3. The method of claim 2,
The contact point is
The center is spaced apart from the center line in the longitudinal direction of the connector member, when the connector member is linearly moved, the surface of the contact end is disposed to contact the surface of the connector member, the chemical injection device.

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