KR20230117554A - Apparatus for Infusing medical liquid - Google Patents

Abstract

The present invention provides a drug solution injection device, a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having a guide groove on an inner surface, and an inside of the reservoir and a driving unit for moving the disposed plunger.

Description

Medicine liquid injection device {Apparatus for Infusing medical liquid}

The present invention relates to a device for injecting a liquid medicine.

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

In the case of a diabetic patient, especially a pediatric diabetic patient, it is necessary to inject a drug solution such as insulin into the human body at regular intervals. A drug injection device in the form of a patch attached to the human body for a certain period of time is being developed, and this drug injection device can be used while being attached to the 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 control the precise injection of the drug into the patient's body, and it is important to precisely inject a small amount of the drug through the small drug injection device.

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

The present invention provides a drug solution injection device that is safely driven and can accurately deliver a drug.

One aspect of the present invention is a base body, a needle assembly mounted on the base body, fluidly connected to the needle assembly, a reservoir having a guide groove on an inner surface, and a plunger disposed inside the reservoir. Provided is a chemical solution injection device including a driving unit for moving the.

In addition, the reservoir may have an inlet end into which the chemical liquid is injected and an outlet end connected to a needle of the needle assembly, and the guide groove may connect the inlet end and the outlet end.

In addition, the guide groove may guide the gas remaining in the inner space of the reservoir to the needle assembly when the liquid medicine is injected into the reservoir.

In addition, a portion of the guide groove may be inclined along the inner surface of the reservoir.

Another aspect of the present invention is a reservoir in which a chemical solution is stored in an internal space and the chemical solution is discharged through a needle by movement of a plunger, the reservoir having an inlet end into which the chemical solution is injected, an outlet end where the needle is installed, and It is disposed on the inner surface of the reservoir, and at least a portion of the reservoir is provided with a guide groove connecting the inlet end and the outlet end.

The drug solution injection device according to an embodiment of the present invention can safely inject the drug solution into a user. The chemical solution injection device removes gas from the reservoir and safely stores the chemical solution in the reservoir, thereby eliminating the risk of gas being injected into the user.

In the chemical solution injection device according to an embodiment of the present invention, safety may be increased by discharging gas discharged through a needle to the outside, and whether or not the chemical solution is stored may be checked. Of course, the scope of the present invention is not limited by these effects.

1 is a block diagram showing a liquid medicine injection system according to an embodiment of the present invention.
2 is a perspective view showing a chemical solution injection device according to an embodiment of the present invention.
3 is an exploded perspective view of the chemical solution injection device of FIG. 2;
FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2 .
FIG. 5 is a diagram showing the reservoir unit of FIG. 2 .
6 is a cross-sectional view of the reservoir unit of FIG. 5;
7 and 8 are cross-sectional views showing a mechanism for storing a chemical liquid in a reservoir unit.
9 is a cross-sectional view showing a reservoir according to another embodiment of the present invention.
10 is a cross-sectional view showing a reservoir according to another embodiment of the present invention.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. Effects and features of the present invention, and methods for achieving them will become clear with reference to the embodiments described later in detail together 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 describing with reference to the drawings, the same or corresponding components are assigned the same reference numerals, and overlapping descriptions thereof will be omitted. .

In the following examples, expressions in the singular number include plural expressions unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have mean that features or components described in the specification exist, and do not preclude the possibility that one or more other features or components may be added.

When an embodiment is otherwise implementable, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially simultaneously, or may be performed in an order reverse to the order described.

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

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

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

The drug injection device 10 injects drugs to be injected into the user, such as insulin, glucagon, anesthetics, painkillers, dopamine, growth hormone, and smoking cessation aids, based on data sensed by the biometric sensor 40. also perform a function.

In addition, the liquid medicine injection device 10 may transmit a device status message including information on the remaining battery capacity of the device, whether or not booting of the device was successful, whether injection was successful, etc. to the controller 30 . Messages delivered to the controller may be delivered to the user terminal 20 via the controller 30 . Alternatively, the controller 30 may transmit improved data obtained 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 target 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 solution injection device 10 may be mounted on the user's body. Also, in another embodiment, the drug solution 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 solution injection system 1 . The user terminal 20 may generate a signal for driving the controller 30 and control the controller 30 to drive the drug injection device 10 . In addition, the user terminal 20 may display biometric information measured by the biometric information sensor 40 and state information of the drug injection device 10 .

The user terminal 20 refers to a communication terminal usable in a wired/wireless communication environment. For example, the user terminal 20 may include a smart phone, 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 reader, It may be a terminal for digital broadcasting, a navigation device, 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. Also, the user terminal 2 may be a wearable device having a communication function and a data processing function, such as a watch, glasses, a hair band, and a ring. 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 one embodiment, the user terminal 20 and the controller 30 may be separated and provided as separate devices. For example, the controller 30 may be provided to a subject equipped with the drug injection device 10, and the user terminal 20 may be provided to the subject or a third person. Since the user terminal 20 is driven by the guardian, the safety of the drug injection system 1 can be increased.

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

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

For example, the controller 30 may transmit an instruction request to measure the current state of the user to the drug injection device 10 and receive measurement data from the drug injection device 10 in response to the instruction request.

The biometric information sensor 40 may perform a function of measuring biometric values such as a user's blood sugar level, blood pressure, heart rate, etc. according to a 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. Data measured by the biometric information sensor 40 may be transmitted to the user terminal 20 and displayed.

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

The user terminal 20 , the controller 30 and the drug injection device 10 may perform communication using a network. For example, the network may include 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 any of these It is a comprehensive data communication network that includes mutual combinations and allows each network constituent entity to communicate smoothly with each other, and may include wired Internet, wireless Internet, and mobile wireless communication network. In addition, wireless communication, for example, wireless LAN (Wi-Fi), Bluetooth, Bluetooth low energy (Bluetooth low energy), Zigbee, WFD (Wi-Fi Direct), UWB (ultra wideband), infrared communication (IrDA, infrared Data Association), NFC (Near Field Communication), 5G, etc. may exist, but are not limited thereto.

FIG. 2 is a perspective view showing a chemical solution injection device 10 according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of the chemical solution injection device 10 of FIG. 2, and FIG. This is a cross-section taken along

Referring to FIGS. 2 to 4 , the drug solution injection device 10 is attached to a user to inject the drug solution, and can inject the drug solution stored therein in a predetermined amount to the user.

The drug solution injection device 10 may be used for various purposes depending on the type of the injected drug solution. For example, the drug solution may include an insulin-based drug solution for diabetics, other pancreas drug solutions, and other various types of drug solutions for the heart.

An embodiment of the drug solution injection device 10 may include a housing 11 covering the outside and an attachment portion 12 positioned adjacent to the user's skin. The chemical solution injection device 10 includes a plurality of parts disposed in an inner 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 solution injection device 10 may be fixed to the skin by the bonding means.

The drug 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, a needle A cover assembly 700 and an alarm unit 800 may be included.

In the chemical solution 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 according to 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. may 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 the lower portion of the chemical solution injection device 10 . The third body 15 is disposed above the first body 13 and supports the reservoir unit 200, the driving module 300, the battery 350, the driving unit 400, etc. in each opening or groove. It can be. In the drawings, the first body 13, the second body 14, and the third body 15 are shown, but are not limited thereto and may be integrally provided or provided in plurality.

Referring to FIG. 4 , a control module 16 may be disposed inside the drug 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 liquid injection device 10. The control module 16 may electrically contact the driving module 300, the battery 350, the alarm unit 800, and a plurality of sensors (not shown) to control their driving.

The needle assembly 100 may be mounted on the first body 13 . In the needle assembly 100, the needle N and/or the cannula C may move in an axial direction by rotation of the sleeve 110. The needle assembly 100 may include a sleeve 110, an elastic member 120, a first holder 130, a second holder 140, a needle N, a cannula C, and a patch P. there is.

Sleeve 110 forms the outer appearance of the needle assembly 100, it can be rotated around the central axis in the longitudinal direction. An elastic member 120 is disposed inside the sleeve 110 so that the sleeve 110 can receive an expansion force from the elastic member 120 .

The elastic member 120 may be disposed between the sleeve 110 and the first holder 130 . When the elastic member 120 expands, the first holder 130 may move downward. Also, when the first holder 130 moves upward, the elastic member 120 may be compressed.

The first holder 130 may support the needle N. Since the needle N is inserted and fixed to one side of the first holder 130, when the first holder 130 moves in the axial direction, the needle N also moves. The first holder 130 is disposed in the inner space of the sleeve 110, and the elastic member 120 is disposed on the upper portion.

The second holder 140 is disposed to face one side of the first holder 130 and may support the cannula (C). The second holder 140 is formed of a flexible material and can be instantly deformed in shape when an external force is applied. In addition, the second holder 140 is made of a rigid material and can be moved by the force applied by the first holder 130 .

Since the needle (N) is fixed to the first holder 130, it can be inserted into or released from the cannula (C) by the axial movement of the first holder (130). One end of the needle (N) may be connected to the reservoir 210 to deliver the drug solution, and the other end may be inserted into the cannula (C) and moved along the cannula (C).

Since the cannula C is fixed to the second holder 140, it can be inserted into the user's skin by axial movement of the second holder 140. Since the cannula (C) has a conduit shape capable of accommodating the needle (N), the liquid discharged from the needle (N) can be injected into the user.

Patch (P) is supported on one side of the drug injection device 10, it is possible to fix the position of the cannula (C). Since the end of the cannula (C) is supported by the patch (P), it is possible to prevent the cannula (C) from being separated during storage or movement.

The end of the needle (N) and/or the end of the cannula (C) is inserted into the patch (P). Before the drug is injected into the user, that is, before the needle (N) and the cannula (C) are inserted into the user, the end of the needle (N) and / or the end of the cannula (C) is supported by the patch (P), location can be set. When the liquid medicine is injected into the reservoir 210, the positions of the needle N and the cannula C are fixed, and gas remaining in the reservoir 210 can be stably discharged.

The cannula C remains inserted into the user's skin, but the needle N rises and is separated from the object. However, the cannula (C) and the needle (N) form a path through which the fluid is moved, so the drug solution injected from the reservoir 210 can be injected into the user through the needle (N) and the cannula (C). .

In the drug injection device 10, the user may simply rotate the needle assembly 100, insert the cannula C into the object, and initiate drug injection. In the drug injection device 10, the user first rotates the sleeve 110 so that the cannula C is inserted into the target object, and the knob (not shown) of the needle assembly 100 presses the trigger member 600 to drive It can be. Thereafter, the driving module 300 is driven, and the liquid medicine can be quantitatively discharged from the reservoir 210 . Therefore, the user can conveniently and stably use the chemical solution injection device 10 .

FIG. 5 is a view showing the reservoir unit 200 of FIG. 2, FIG. 6 is a cross-sectional view of the reservoir unit 200 of FIG. 5, and FIGS. 7 and 8 show a chemical solution stored in the reservoir unit 200 This is a cross-sectional view showing the mechanism.

Referring to FIGS. 3 to 8 , 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 can 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, and a sealing ring 240.

The reservoir 210 may extend to a predetermined length in the longitudinal direction and store the chemical liquid in the internal space. In the reservoir 210, the chemical liquid may be discharged through 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.

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

The inlet end 210I is connected to the lower part of the drug injection device 10, and the drug may be injected by the drug injector NI. A first sealing member 251 is disposed at the inlet end 210I, and the first sealing member 251 can prevent leakage of the chemical solution. The inlet end 210I may have a first connection opening 212 connected to the guide groove 211 .

The outlet end 210E is disposed apart from the inlet end 210I and is connected to the needle N so that the drug can be discharged. A second sealing member 252 is disposed at the outlet end 210E, and a needle N may be fixed to the second sealing member 252 . The outlet end 210E may have a second connection opening 213 connected to the guide groove 211 .

The first diameter DI of the inlet end 210I may be set larger than the second diameter DE of the outlet end 210E. Since the needle of the drug injector NI is inserted into the inlet end 210I, it may have a sufficient opening area into which the needle can be inserted.

The guide groove 211 may be disposed on an inner surface of the reservoir 210 . At least a portion of the guide groove 211 may extend to connect between the inlet end 210I and the outlet end 210E.

The guide groove 211 may form a path for guiding gas remaining in the inner space of the reservoir 210 to the needle assembly 100 . Inside the reservoir 210, more specifically, in the gap between the front end of the reservoir 210 and the plunger 230, there is gas (air) remaining in the assembly or manufacturing process. When the drug is injected into the reservoir 210 through the external drug injector NI, the gas may be discharged through the needle N along the guide groove 211.

In one embodiment, the guide groove 211 may extend to connect between the inlet end 210I and the outlet end 210E (see FIG. 5).

The guide groove 211 may include a first guide groove 211A and a second guide groove 211B connected to each other. The first guide groove 211A may be connected to the inlet end 210I, and the second guide groove 211B may be connected to the outlet end 210E. When the inlet end 210I and the outlet end 210E are disposed at different heights, at least one of the first guide groove 211A and the second guide groove 211B may be inclined.

For example, referring to the drawings, the first guide groove 211A extends from the first connection opening 212 and may extend in an upward direction. The second guide groove 211B is connected to the first guide groove 211A and may be connected to the second connection opening 213 . At this time, the second guide groove 211B may extend in a horizontal direction.

The first guide groove 211A and the second guide groove 211B may have a predetermined width. In the first guide groove 211A, the first width W1 of a portion adjacent to the inlet end 210I may be set larger than that of other portions. A portion of the first guide groove 211A and the second guide groove 211B have a size of the second width W2, and a portion of the first guide groove 211A adjacent to the first connection opening 212 is the first guide groove 211A. It may have a first width W1 greater than the second width W2. Since the first width W1 is disposed in an expanded form in the first guide groove 211A, the chemical solution injected from the inlet end 210I can be guided to the reservoir 210, and the chemical solution at the inlet end 210I When this is injected, the movement of the gas is guided from the first width W1 to the second width W2 so that the air can be easily discharged.

The cross-sectional shape of the guide groove 211 may be variously set. The cross section of the guide groove 211 may be polygonal, or may be formed to have a curved surface at least in part.

The guide groove 211 may be disposed on the inner surface of the front of the reservoir 210 . The front of the reservoir 210 may have an inclined portion and a flat portion corresponding to the shape of the plunger 230 . The guide groove 211 may extend to the first connection opening 212 and the second connection opening 213 along the inclined portion and the flat portion.

In another embodiment, the guide groove is disposed between the inlet end 210I and the outlet end 210E, and is connected to at least one of the inlet end 210I and the outlet end 210E, and may not be connected to the other one. there is. For example, one end of the guide groove may be connected to the inlet end 210I, and the other end may be spaced apart from the outlet end 210E. One end of the guide groove 211 is connected to the outlet end 210E, and the other end may be spaced apart from the inlet end 210I.

In another embodiment, the guide groove may be disposed between the inlet end 210I and the outlet end, and spaced apart from both the inlet end 210I and the outlet end 210E. For example, the guide groove 211 is not connected to the inlet end 210I and the outlet end 210E, and may be disposed between the inlet end 210I and the outlet end 210E.

In another embodiment, a plurality of guide grooves may be provided and disposed between the inlet end 210I and the outlet end 210E. For example, a plurality of divided guide grooves may be disposed in a space between the inlet end 210I and the outlet end 210E.

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 liquid may be discharged from the inner space to the needle N.

The plunger 230 may have an end 231 and an inclined surface 232 . The end end 231 may move toward the front of the reservoir 210 to move the liquid medicine. The inclined surface 232 may adhere to the inclined portion of the reservoir 210 .

The plunger 230 may have a connector member 233 extending rearward. The connector member 233 may be installed on the plunger 230 and move linearly along with the linear movement of the plunger 230 .

The connector member 233 is made of a material having electrical conductivity and may have a shaft shape. As the connector member 233 moves and contacts the first sensor unit (not shown), the storage amount of the drug may be measured or the drug injection device may be started to operate.

The plunger 230 has a sealing portion 240 provided at a portion in contact with the inner wall of the reservoir 210 to prevent leakage of the chemical liquid when the plunger 230 moves.

The driving module 300 may generate driving force and transmit the driving force to the driving unit 400 . The driving force transmitted by the driving unit 400 linearly moves the plunger 230 inside the reservoir 210 to discharge the liquid medicine.

When the drive units 400 are engaged with each other by the clutch unit 500, the drive module 300 rotates the drive wheel 420 of the drive unit 400, and the rotation of the drive wheel 420 loads the load. The plunger 230 may move as the 410 linearly moves.

The drive module 300 may be any type of device having a power to suck in the chemical solution and to discharge the chemical solution by electricity. For example, all types of pumps such as mechanical displacement type micropumps and electromagnetic motion type micropumps can be used. The mechanical displacement type micropump is a pump that uses the movement of solids or fluids such as gears or diagrams to create a pressure difference to induce fluid flow. Diaphragm displacement pumps, fluid displacement pumps ), and rotary pumps. An electrokinetic micropump is a pump that uses energy in the form of electricity or magnetism directly to move a fluid, and includes an electrohydrodynamic pump (EHD), an electroosmotic pump, and a magnetohydrodynamic pump ( Magneto hydrodynamic pump) and Electro wetting pump.

The battery 350 may supply electricity to the liquid medicine injection device 10 to activate each part. The figure shows a pair of batteries 350, but is not limited thereto, and may be variously set according to the capacity, use range, use time, etc. of the liquid 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, and based on the electrical signal measured by the sensor unit, the rotational speed or rotational speed of the drive unit 400, the amount of chemical liquid stored in the reservoir 210, and the amount of liquid injected into the user It is possible to measure data on the amount of liquid medicine and the like.

The driving unit 400 is installed between the driving module 300 and the reservoir unit 200, and the plunger 230 disposed in the reservoir 210 can be moved with driving force generated by the driving module 300. there is. However, the driving unit 400 can move the plunger 230 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 can move in the longitudinal direction of the reservoir 210 to move the plunger 230. The rod 410 may have a threaded shape on its surface. The rod 410 is inserted into the connecting member 520 and is connected to the drive wheel 420 by the clutch unit 500 when liquid is discharged in a fixed amount, so that the rod 410 can be moved forward.

The driving wheel 420 is drivingly connected to the driving module 300 and can rotate by driving the driving module 300 . The driving wheel 420 may have a first connection end 421 and a second connection end 422, and may have a space in which the rod 410 can move. Since at least one of the first connection end 421 and the second connection end 422 is always drivingly connected to the driving module 300, the driving wheel 420 can be rotated by driving the driving module 300. .

In one embodiment, the first connection end 421 and the second connection end 422 may have a gear tooth shape. A connector (not shown) connected to the drive module 300 applies gear teeth to rotate the drive wheel 420 .

The clutch unit 500 may drively connect 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 outside the connecting member 520, is spaced apart from the connecting member 520 at a predetermined interval when inactive, and connects the rod 410 and the driving wheel 420 when activated. The coupler 510 is a component capable of applying an elastic force to the outside of the connecting member 520, and is not limited to a specific shape. However, in the following description, for convenience of description, the case of the spring type will be mainly described.

At least a portion of the connection member 520 may 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 each have the form of a screw and a screw thread. A screw thread is formed on an outer circumferential surface of the rod 410 and a screw thread is formed on an inner circumferential surface of the connection member 520 to be connected in a screw-fitting manner.

In one embodiment, the connecting member 520 has a screw thread formed on the inner circumferential surface at one end, but the screw thread may not be disposed on the other end. Since the rod 410 is screwed only at one end 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 are screwed together By reducing the load by the drive unit 400, the plunger 230 can move forward even with a rather weak force.

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

The trigger member 600 may be rotated in one direction around a pivot axis. At this time, the trigger member 600 may apply force to 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 presses the end of the trigger member 600, so that rotation of the trigger member 600 may be initiated. When the trigger member 600 rotates, the trigger member 600 presses the end of the coupler 510, the coupler 510 is engaged with the connecting member 520, and the clutch unit 500 is activated.

Needle cover assembly 700 may be mounted below needle assembly 100 . The needle cover assembly 700 may prime air stored in the reservoir unit 200 before injecting the liquid medicine. Through the chemical liquid injector (NI), when the chemical liquid is in the reservoir 210, gas (air) remaining in the reservoir 210 may be discharged to the outside.

The needle cover assembly 700 may have 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 solution injection device 10 . The second cover 720 may be inserted and assembled into the opening of the first cover 710 .

The second cover 720 is assembled to the first cover 710, and a needle (N) and/or a cannula (C) 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 with a slightly greater 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 protrusion 721 of the second cover 720 is inserted into the opening of the lower end of the second body 14 . The diameter G2 of the protrusion 721 is set to be slightly larger than the diameter G1 of the opening. Since the second cover 720 has a predetermined elasticity, the protrusion 721 can be inserted into the opening and fixed.

The second cover 720 has an inner diameter G3 so that the needle N and the cannula C can be aligned thereon. The inner diameter G3 forms a storage space of the second cover 720, and a liquid medicine may be stored or a gas may be moved and discharged.

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 gas such as air passes through the filter member 730, but liquid such as 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 discharged from the needle is stored in the storage space defined by the second cover 720 and the filter member 730. can

The shape of the filter member 730 may change according to the amount of liquid medicine stored in the storage space. For example, when the storage space is filled with the chemical solution, the filter member 730 expands downward, so that the user can recognize that the chemical solution has flowed 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 solution injection device 10 and can notify a user of normal operation or malfunction of the drug solution injection device 10 .

For example, the alarm unit 800 is disposed below the housing 11 and is connected to a circuit board. The alarm unit 800 may generate a warning sound or generate light to deliver an alarm to an external user.

An operation of priming the gas remaining in the reservoir 210 while storing the chemical solution in the reservoir unit 200 will be described with reference to FIGS. 7 and 8 .

As shown in FIG. 7 , prior to injecting the chemical solution, the plunger 230 is disposed at the front end of the reservoir 210 , 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 inserts the drug solution D to be injected into the drug injector NI, and inserts the drug injector NI into the inlet end 210I of the reservoir unit 200. At this time, 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 solution is injected while air remains in the reservoir 210, there is a risk that the air will also be injected into the user, so an operation to remove the air (priming operation) is required.

When the liquid medicine starts flowing into the reservoir 210 from the liquid medicine injector NI, the remaining gas is pushed out through the needle N while flowing between the inner surface of the reservoir 210 and the plunger 230. 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 flowing chemical liquid D. The gas passing through the needle N moves to the needle cover assembly 700 and passes through the filter member 730 of the needle cover assembly 700 to be discharged to the outside.

Gas remaining inside the reservoir 210 is quickly discharged to the outside by the guide of the guide groove 211, and the gas in the reservoir 210 can be removed.

Subsequently, as shown in FIG. 8 , the chemical liquid flows into the inner space of the reservoir 210, the flowing chemical liquid pushes the plunger 230 backward, and the chemical liquid is stored in the inner space of the reservoir 210.

When all gas is removed, the chemical solution D may be discharged through the needle N. Since the chemical solution D does not pass through the filter member 730, it is stored in the storage space of the needle cover assembly 700. Since the shape of the filter member 730 may be deformed, when the chemical liquid D is stored in the storage space, it may protrude downward. The user can check whether the filter member 730 protrudes, check whether there is no gas inside the reservoir unit 200, and check whether the chemical liquid is stored in the reservoir 210.

The drug solution injection device 10 according to an embodiment of the present invention can safely inject the drug solution into a user. The chemical solution injection device 10 removes gas from the reservoir 210 and safely stores the chemical solution in the reservoir, thereby eliminating the risk of gas being injected into the user. A guide groove 211 is disposed on the inner surface of the reservoir 210, and when the chemical solution is injected into the reservoir 210 to store the chemical solution, the gas inside the guide groove 211 is quickly and completely moved to the outside. can be ejected.

The chemical liquid injection device 10 according to an embodiment of the present invention may increase safety by discharging the gas discharged through the needle N to the outside. The filter member 730 of the needle cover assembly 700 may discharge gas discharged from the reservoir 210 to the needle N to the outside. In addition, the filter member 730 of the needle cover assembly 700 does not pass the drug solution D, so when the drug solution D is filled in the needle cover assembly 700, it protrudes convexly, indicating whether the drug solution D is stored. can be checked.

9 is a cross-sectional view showing a reservoir 210A according to another embodiment of the present invention.

Referring to FIG. 9, the reservoir 210A has an inlet end 210I and an outlet end 210E, and a guide groove 211-1 extending to connect the inlet end 210I and the outlet end 210E. can have

The guide groove 211-1 may connect the first connection opening 212A and the second connection opening 213A. Since the first connection opening 212A and the second connection opening 213A are disposed at the same height, the guide groove 211-1 may extend horizontally.

10 is a cross-sectional view showing a reservoir 210B according to another embodiment of the present invention.

Referring to FIG. 10, the reservoir 210B has an inlet end 210I and an outlet end 210E, and a guide groove 211-2 extending to connect the inlet end 210I and the outlet end 210E. can have

The guide groove 211-2 may connect the first connection opening 212B and the second connection opening 213B. Since the first connection opening 212B and the second connection opening 213B are disposed at different heights, the guide groove 211-2 may be inclined.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments and should not be determined, and not only the claims to be described later, but also all ranges equivalent to or equivalently changed from these claims fall within the spirit of the present invention. would be considered to be in the category.

1: liquid medicine injection system
10: chemical solution injection device
100: needle assembly
200: reservoir unit
300: driving module
400: drive unit
500: clutch unit
600: absence of 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 having a guide groove on an inner surface; and
A chemical solution injection device comprising a; drive unit for moving a plunger disposed inside the reservoir. According to claim 1,
The reservoir
It has an inlet end into which the chemical liquid is injected and an outlet end connected to the needle of the needle assembly,
The guide groove connects the inlet end and the outlet end, the chemical solution injection device. According to claim 1,
The guide groove
A chemical solution injection device for guiding gas remaining in the inner space of the reservoir to the needle assembly when the drug solution is injected into the reservoir. According to claim 1,
The guide groove
A chemical solution injection device in which a partial section is disposed obliquely along the inner surface of the reservoir.

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