KR20240031286A - Reservoir assembly and apparatus for infusing medical liquid comprising the same - Google Patents

Abstract

One embodiment of the present invention includes a reservoir having an opening formed on one side and providing a storage space for a chemical solution, a sensing member provided on the other side of the reservoir, and a sensor inserted into the reservoir between the opening and the sensing member. A reservoir assembly may be provided including a movable plunger, one side of which is connected to the plunger, and the other side of which extends toward the sensing member and includes a connector that is electrically connected to the sensing member as the plunger moves.

Description

Reservoir assembly and apparatus for infusing medical liquid comprising the same}

The present invention relates to a reservoir assembly and a chemical injection device including the same.

Generally, a drug injection device such as an insulin injection device is used to inject a drug solution into the patient's body. These chemical injection devices are sometimes used by professional medical staff such as doctors and nurses, but in most cases, they are used by the general public, such as patients themselves or their guardians.

Diabetic patients, especially pediatric diabetic patients, need to inject medicinal solutions such as insulin into the body at set intervals. A patch-type drug injection device that is attached to the human body for a certain period of time is being developed, and this drug injection device can be used while attached to the patient's body, such as the abdomen or waist, in the form of a patch 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. It is important to precisely inject a small amount of drug solution through a small drug injection device.

When attached to the human body, a chemical injection device needs to be comfortable to wear, convenient to use, durable, and run at low power. In particular, since the drug injection device is used by attaching it directly to the patient's skin, it is important for the user to conveniently and safely operate the drug injection device.

The present invention provides a reservoir assembly that can deliver an accurate amount of chemical solution by preventing unintentional movement of the plunger inside the reservoir, and a chemical injection device including the same.

As a means to achieve the above-described technical problem, an embodiment of the present invention includes a reservoir that provides a space therein, is inserted into the reservoir, moves back and forth along one direction of the reservoir, and provides a storage space for the chemical solution. a plunger forming a plunger, a rod fixed to the plunger and extending in the one direction, a connecting member screwed to the rod and movable relative to the rod, and when the plunger and the connecting member are adjacent to each other, the plunger and It may include a force member disposed to generate a pushing force between the connection members.

In one embodiment, the rod may have threads formed on its outer peripheral surface, and the connecting member may have threads formed on its inner peripheral surface, so that the rod may be screwed while inserted into the connecting member.

In one embodiment, the connecting member may be threaded in a predetermined area.

In one embodiment, the force member may be provided as a spring.

In one embodiment, the force member may be arranged to wrap around the front end of the rod with the front end fixed to the plunger.

In another embodiment of the present invention, a chemical liquid injection device includes a reservoir assembly in which a chemical liquid is stored, a needle assembly fluidly connected to the reservoir assembly to discharge the chemical liquid, and connected to the reservoir assembly, when driven. and a driving unit that moves the chemical solution from the reservoir to the needle assembly, wherein the reservoir assembly includes a reservoir providing a space therein, and is inserted into the reservoir along one direction of the reservoir. A plunger that moves reciprocally and forms a storage space for the chemical solution, a rod fixed to the plunger and extending to the opposite side of the storage space, a connection member screwed to the rod and movable relative to the rod, and the plunger and the A force member may be disposed to generate a pushing force between the plunger and the connecting member when the connecting members are adjacent.

Other aspects, features and advantages in addition to those described above will become apparent from the following drawings, claims and detailed description of the invention.

The chemical injection device and reservoir assembly according to an embodiment of the present invention can store an accurate amount of chemical liquid in the reservoir and provide it to the user. Before the chemical solution is injected into the user, the volume of the maximum storage space can be prevented from changing due to vibration applied to the chemical injection device and the reservoir assembly.

The chemical injection device and reservoir assembly according to an embodiment of the present invention can secure a space for storing a predetermined amount of chemical liquid in the reservoir, thereby preventing errors in the amount of chemical liquid to be provided to the user. You can. Of course, the scope of the present invention is not limited by this effect.

1 is a block diagram showing a chemical injection system according to an embodiment of the present invention.
Figure 2 is a perspective view showing a chemical injection device according to an embodiment of the present invention.
Figure 3 is an exploded perspective view of the chemical injection device of Figure 2.
Figure 4 is a cross-sectional view taken along line IV-IV of Figure 2.
Figure 5 is a diagram showing a reservoir assembly according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating an initial state in which no chemical solution is stored in the storage space of the reservoir of FIG. 5.
Figure 7 is an enlarged view of portion A of Figure 6.
Figures 8 to 10 are cross-sectional views showing the operation of injecting a chemical solution into a reservoir, storing the chemical solution, and discharging the chemical solution through a needle.

Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along 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. When describing with reference to the drawings, identical or corresponding components will be assigned the same reference numerals and redundant description thereof will be omitted. .

In the following examples, singular terms include plural terms unless the context clearly dictates otherwise.

In the following embodiments, terms such as include or have mean that the features or components described in the specification exist, and do not exclude in advance the possibility of adding one or more other features or components.

In cases where an embodiment can be implemented differently, a specific process sequence may be performed differently from the described sequence. For example, two processes described in succession may be performed substantially at the same time, or may be performed in an order opposite to that in which they are described.

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

Figure 1 is a block diagram showing a chemical 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 information sensor 40. The drug injection system 1 allows the user to drive and control the system using the user terminal 20, and the drug injection device 10 injects the drug based on the blood sugar information monitored by the biometric information sensor 40. It can be injected periodically.

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

Additionally, the chemical injection device 10 may transmit a device status message including information on the device's remaining battery capacity, whether the device was successfully booted, whether the injection was successful, etc., to the controller 30 . Messages delivered to the controller may be delivered to the user terminal 20 through the controller 30. Alternatively, the controller 30 may transmit improved data processed from the received messages to the user terminal 20.

In one embodiment, the chemical 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. Additionally, in another embodiment, the chemical injection device 10 can be mounted on an animal to inject the chemical solution.

The user terminal 20 may receive an input signal from the user to drive and control the chemical injection system 1. The user terminal 20 may generate a signal that drives the controller 30 and control the controller 30 to drive the chemical injection device 10. Additionally, the user terminal 20 can display biometric information measured from the biometric information sensor 40 and status information of the chemical injection device 10 .

The user terminal 20 refers to a communication terminal that can be used in a wired or wireless communication environment. For example, the user terminal 20 includes 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 digital broadcasting terminal, navigation, kiosk, MP3 player, digital camera, home appliance, camera-equipped device, and other mobile or non-mobile computing devices. Additionally, the user terminal 20 may be a wearable device such as a watch, glasses, hair band, or ring equipped with a communication function and data processing function. However, as described above, terminals equipped with applications capable of Internet communication can be borrowed without limitation.

The user terminal 20 can 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 chemical 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 improving 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 controller 30, which is provided as one with the user terminal 20, can communicate with the chemical solution injection device 10 to control the injection of the chemical solution.

The controller 30 performs a function of transmitting and receiving data with the drug injection device 10, transmits a control signal related to the injection of a drug solution such as insulin to the drug injection device 10, and detects blood sugar from the biometric information sensor 40. Control signals related to measurement of biometric values, such as the like, can be received.

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

The biometric information sensor 40 may perform a function of measuring the user's biometric values such as blood sugar level, 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 the cycle and/or injection amount of the chemical solution 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.

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

The user terminal 20, the controller 30, and the chemical injection device 10 may communicate using a network. For example, networks include Local Area Network (LAN), Wide Area Network (WAN), Value Added Network (VAN), mobile radio communication network, satellite communication network, and their It is a comprehensive data communication network that includes mutual combinations and allows each network member to communicate smoothly with each other, and may include wired Internet, wireless Internet, and mobile wireless communication networks. In addition, wireless communications include, for example, wireless LAN (Wi-Fi), Bluetooth, Bluetooth low energy, ZigBee, WFD (Wi-Fi Direct), UWB (ultra wideband), and infrared communications (IrDA). Data Association), NFC (Near Field Communication), 5G, etc., but are not limited to these.

FIG. 2 is a perspective view showing a chemical injection device according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of the chemical injection device of FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 2.

The drug injection device 10 according to an embodiment of the present invention is attached to the user who is to inject the drug, and can inject the drug stored inside in a fixed amount set to the user.

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

Referring to FIG. 2, an embodiment of the chemical injection device 10 may include a housing 11 covering the outside and an attachment portion 12 located adjacent to the user's skin. The chemical injection device 10 may include a plurality of parts disposed in the internal space between the housing 11 and the attachment portion 12. A separate joining means may be further interposed between the attachment portion 12 and the user's skin, and the chemical injection device 10 may be fixed to the skin by the joining means.

Referring to FIG. 3, the chemical injection device 10 includes a needle assembly 100, a reservoir assembly 200, a driving module 300, a battery 350, a driving unit 400, a clutch unit 500, and a trigger. It may include a member 600, a needle cover assembly 700, and an alarm unit 800.

The chemical injection device 10 may have a base body forming 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 below the housing 11, and the needle assembly 100, reservoir assembly 200, drive module 300, battery 350, etc. can be supported in each opening or groove. there is. The second body 14 is disposed below the first body 13 and may be connected to the attachment portion 12. The second body 14 may cover the 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 assembly 200, drive module 300, battery 350, drive unit 400, etc. in each opening or groove. It can be. In the drawing, the first body 13, the second body 14, and the third body 15 are shown, but the present invention is not limited thereto and may be provided as one body or in plural pieces.

Referring to FIG. 4, a control module 16 may be disposed inside the chemical injection device 10. A control module 16, which is a circuit board, is disposed below the second body 14 and can control the overall operation 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 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 be moved in the 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.

The sleeve 110 forms the exterior of the needle assembly 100 and can rotate in the longitudinal direction about a central axis. An elastic member 120 is disposed inside the sleeve 110, so that the sleeve 110 can receive 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 can be moved downward. Additionally, 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 on one side of the first holder 130, when the first holder 130 moves in the axial direction, the needle N also moves together. The first holder 130 is disposed in the inner space of the sleeve 110, and an elastic member 120 is disposed at the top.

The second holder 140 is arranged to face one side of the first holder 130 and can support the cannula (C). The second holder 140 is made of a flexible material, and its shape can be instantaneously changed when an external force is applied. Additionally, the second holder 140 is made of a rigid material and can be moved in position 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 uninserted from the cannula (C) by moving the first holder (130) in the axial direction. One end of the needle (N) is connected to the reservoir 210 so that the medicinal solution can be delivered, and the other end is inserted into the cannula (C) and can move 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 moving the second holder 140 in the axial direction. Since the cannula (C) has a conduit shape that can accommodate the needle (N), the medical solution discharged from the needle (N) can be injected into the user.

The patch (P) is supported on one side of the drug injection device 10 and can fix the position of the cannula (C). Since the end of the cannula (C) is supported by the patch (P), the cannula (C) can be prevented from being separated during storage or movement.

The end of the needle (N) and/or the end of the cannula (C) are inserted into the patch (P). Before the medicinal solution 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) are supported on the patch (P), The location can be set. When injecting a chemical solution into the reservoir 210, the positions of the needle (N) and the cannula (C) are fixed, and the gas remaining inside 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 fluid moves, so the chemical 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 can simply rotate the needle assembly 100, insert the cannula C into the object, and start injection of the drug. The drug injection device 10 is operated by the user first rotating the sleeve 110 so that the cannula C is inserted into the object, and the knob (not shown) of the needle assembly 100 pushes the trigger member 600. The module can be run.

In one embodiment, the trigger member may generate a mechanical signal that causes the chemical solution of the chemical injection device to be injected. The trigger member is rotatably disposed on one side of the third body, and the trigger member rotates to start driving the drive module, and at the same time, the clutch unit can drive and connect the drive unit.

Specifically, when the user rotates the needle assembly, the knob of the needle assembly may apply force to the end of the trigger member, thereby initiating rotation of the trigger member. The trigger member rotates to force the end of the coupler, and the coupler engages the connection member to activate the clutch unit.

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 placed below the chemical injection device 10. The second cover 720 may be inserted into the opening of the first cover 710 and assembled.

The second cover 720 is assembled to the first cover 710, and the needle (N) and/or cannula (C) may be aligned at 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 part exposed to the outside and is made of a material with somewhat high rigidity. The second cover 720 is assembled to the first cover 710 and is made of a material with less rigidity than the first cover 710 in order to be inserted into the opening of the third body 15.

The center of the second cover 720 may be provided with a protrusion 721 inserted into the third body 15. 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 can be assembled. You can.

The protrusion 721 of the second cover 720 is inserted into the opening at the bottom of the third body 15. 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 certain amount of elasticity, the protrusion 721 can be inserted into the opening and fixed thereto.

The second cover 720 has an inner diameter (G3), so that the needle (N) and the cannula (C) can be aligned at the top. The inner diameter G3 forms a storage space of the second cover 720, where chemical liquid can be stored or gas can be moved and discharged.

The filter member 730 is mounted on the second cover 720. The filter member 730 is disposed below the storage space of the second cover 720, and gases such as air pass through the filter member 730, but liquids such as chemicals do 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 liquid discharged from the needle will be stored in the storage space defined by the second cover 720 and the filter member 730. You can.

The shape of the filter member 730 may change depending on the amount of chemical solution stored in the storage space. For example, when the storage space is filled with a chemical solution, the filter member 730 expands downward, allowing the user to recognize that the chemical solution has entered the needle cover assembly 700.

The adhesive layer 740 is disposed on one surface of the needle cover assembly 700, and the needle cover assembly 700 can be attached to the attachment portion 12.

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

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

FIG. 5 is a diagram illustrating a reservoir assembly 200 according to an embodiment of the present invention.

Referring to FIG. 5, the reservoir assembly 200 can store a chemical solution in a space formed inside the reservoir 210, and can move the chemical solution to the needle N in a fixed amount according to the movement of the plunger 230. . The reservoir assembly 200 may include a reservoir 210, a cap cover 220, a plunger 230, a contact member 233, a sealing ring 240, a rod 250, and a connection member 260. there is.

The reservoir 210 forms the exterior of the reservoir assembly 200, and has a plunger 230 inside, and at least a portion of the contact member 233, the rod 250, and the connecting member 260 that can be accommodated therein. Internal space can be provided.

The cross section of the reservoir 210 in the horizontal direction may have different horizontal and vertical lengths. For example, the cross-section of the reservoir 210 may be oval.

The reservoir 210 extends to a predetermined length in the longitudinal direction, so that the chemical solution can be stored in a storage space defined by the reservoir 210 and the plunger 230 in the internal space. As the chemical liquid is stored in the reservoir 210, the plunger 230 may move rearward along the longitudinal direction of the reservoir 210. And, as the plunger 230 moves forward, the chemical solution may be discharged into the needle (N).

A cap cover 220 is mounted on the rear end of the reservoir 210, and the contact member 233 and the rod 250 and/or the connecting member 260 are connected to the cap cover through an opening disposed in the cap cover 220. It can move through (220).

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

The inlet end 210I is connected to the lower part of the chemical solution injection device, and the chemical solution can be injected by the chemical solution injector. 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 outlet end (210E) is arranged to be spaced apart from the inlet end (210I) and is connected to the needle (N) so that the chemical solution can be discharged. A second sealing member 252 is disposed at the outlet end 210E, and the needle N may be fixed to the second sealing member 252.

The guide groove 211 may be formed on the inner surface of the reservoir 210. The guide groove 211 may be extended so that at least a portion of the section connects between the inlet end 210I and the outlet end 210E.

The plunger 230 is inserted into the reservoir 210 and can reciprocate along one direction of the reservoir 210. In one embodiment, the plunger 230 may move linearly within the reservoir 210 by driving the driving module and the driving unit 400. When the chemical liquid flows into the reservoir 210, the plunger 230 moves rearward, and as the plunger 230 advances, the chemical liquid stored in the storage space of the reservoir 210 may be discharged to the needle (N).

The plunger 230 may have an end 231 and an inclined surface 232 on one side. The end 231 and the inclined surface 232 form the front of the plunger 230 and may be a part that defines the storage space together with the reservoir 210. The end 231 and the inclined surface 232 may be in close contact with the inner surface of the reservoir 210 at the front end of the reservoir 210.

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

The contact member 233 is made of an electrically conductive material and may have a shaft shape. As the contact member 233 moves and comes into contact with a sensor unit (not shown), the stored amount of the chemical solution can be measured or the chemical injection device can be started to operate.

The plunger 230 is provided with a sealing ring 240 at a portion that contacts the inner wall of the reservoir 210, thereby preventing the chemical solution stored in the storage space from leaking when the plunger 230 is moved.

The driving force generated by the driving module may be transmitted to the driving unit. The driving force transmitted to the driving unit can move the plunger located at the rear of the reservoir forward.

The driving module can be any type of device that has chemical suction power and chemical discharge power by electricity. For example, all types of pumps, such as mechanical displacement micropumps and electromagnetic motion micropumps, can be used. A mechanical displacement micropump is a pump that uses the movement of a solid or fluid, such as a gear or diagram, to create a pressure difference to induce the flow of fluid, and is called a diaphragm displacement pump or fluid displacement pump. ), rotary pump, etc. Electromagnetic micropumps are pumps that use energy in the form of electricity or magnetism directly to move fluid, and include electrohydrodynamic pumps (EHD), electroosmotic pumps, and magnetohydrodynamic pumps ( Magneto hydrodynamic pump, electro wetting pump, etc.

The battery can supply electricity to the chemical injection device, activating each component. In the drawing, a pair of batteries is shown, but the battery is not limited to this and can be set in various ways depending on the capacity, usage range, usage time, etc. of the chemical injection device.

The battery is placed adjacent to the drive module and can supply electricity to the drive module. In addition, the battery is connected to the control module, and can measure data on the number of rotations or rotational speed of the driving unit, the amount of chemical liquid stored in the reservoir, and the amount of chemical liquid injected to the user based on the electrical signal measured by the sensor unit. there is.

The driving unit is installed between the driving module and the reservoir assembly and can move the plunger disposed in the reservoir using the driving force generated by the driving module. However, the drive unit can move the plunger forward only when the rod and drive wheel are coupled or connected by a clutch unit.

FIG. 6 is a diagram showing a state in which no chemical liquid is stored in the storage space of the reservoir 210 of FIG. 5, FIG. 7 is an enlarged view of part A of FIG. 6, and FIG. 8 shows the maximum chemical liquid in the storage space. This is a diagram showing the stored state, FIG. 9 is a diagram showing a state in which the clutch unit is activated in FIG. 8, and FIG. 10 is a diagram showing a state in which a chemical solution is injected.

Referring to FIG. 6, the rod 250 may be fixed to the plunger 230 and extend rearward. The rod 250 penetrates the cap cover 220 through the opening of the cap cover 220 and can move back and forth in one direction of the reservoir 210, that is, along the longitudinal direction of the reservoir 210, and the rod 250 ) may protrude to the outside of the reservoir 210.

The rod 250 is coupled to the connecting member 260, and as the plunger 230 moves, the rod 250 and the connecting member 260 can move together. Additionally, the rod 250 may move relative to the connecting member 260. In one embodiment, the rod 250 may have threads formed along the longitudinal direction on the outer peripheral surface, and the connecting member 260 may have threads formed on the inner peripheral surface into which the rod 250 is inserted. The rod 250 can be inserted into the connecting member 260 and screwed together. That is, the rod 250 is a male thread and the connecting member 260 is a female thread, and the rod 250 and the connecting member 260 can be screwed together.

As the plunger 230 moves, the rod 250 is inserted into and screwed to the connecting member 260, and the rod 250 and the connecting member 260 can move together. And, as the connecting member 260 rotates, the rod 250 can move relative to the connecting member 260. That is, in the reservoir assembly 200, the rotational movement of the connecting member 260 can be converted into the linear movement of the rod 250.

In one embodiment, the connecting member 260 may have threads formed in a predetermined area. For example, the connection member 260 may have threads formed on the inner peripheral surface at one end, but may not have threads formed at the other end. A thread is formed on the inner peripheral surface of the first section L1 of the connecting member 260, and can be screwed to the rod 250 only in the first section L1. Additionally, the diameter of the first section L1 corresponds to the rod 250 and may have a size of D1.

Screw threads may not be formed on the inner peripheral surface of the second section L2 of the connecting member 260. Additionally, 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 260 may not contact the rod 250.

The length of the first section L1 may be set to overlap the coupler 510 when the connecting member 260 moves rearward. Referring to FIGS. 8 and 9 , when the plunger 230 is disposed rearmost, at least a portion of the first section L1 overlaps the coupler 510, that is, at least a portion faces the coupler 510. can be placed.

As shown in FIG. 9, when the clutch unit 500 is activated, the length of the first section L1 in the connecting member 260 is set so that the coupler 510 grips at least a portion of the first section L1. It can be. Since the rod 250 is screwed only in the first section L1 of the connecting member 260, when the connecting member 260 rotates to move the rod 250 forward, the connecting member 260 and the rod ( 250) can reduce the load by screwing.

When the clutch unit 500 is activated, the connection member 260 can rotate by the driving wheel 420. In one embodiment, the driving wheel 420 is dynamically connected to the driving module and can rotate by driving the driving module. The driving wheel 420 has a first connection end 421 and a second connection end 422, and may have a space inside where the connection member 260 can move. Since at least one of the first connection end 421 and the second connection end 422 is always connected to the drive module, the drive wheel 420 can rotate when the drive module is driven. For example, 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 may apply gear teeth to rotate the drive wheel 420.

When the clutch unit 500 is activated, the driving wheel 420 and the connection member 260 may be drivingly connected.

The clutch unit 500 may include a coupler 510, and the coupler 510 may be disposed between the rod 250 and the drive wheel 420. The coupler 510 is disposed on the outside of the connecting member 260, is spaced apart from the connecting member 260 at a predetermined distance when the clutch unit is deactivated, and is coupled to the connecting member 260 to load the coupling member 260 when the clutch unit is activated. (250) and the driving wheel (420) can be connected.

The coupler 510 is a component that can apply elastic force to the outside of the connecting member 260, and may be in the form of a spring, for example.

When the driving wheel 420 and the connecting member 260 are engaged with each other by the coupler 510, the driving wheel 420 of the driving unit 400 rotates by the driving force generated by the driving module, and the driving wheel As the connecting member 260 rotates due to the rotation of 420, the rod 250 moves linearly and the plunger 230 can be moved.

Referring to FIGS. 6 and 7 , the reservoir assembly 200 may include a force member 270 .

The force member 270 may be disposed between the plunger 230 and the connection member 260. The pressing member 270 may press the plunger 230 forward and the connecting member 260 backward while the plunger 230 and the connecting member 260 are adjacent to each other. The force member 270 may be a component that can generate a pushing force between the plunger 230 and the connection member 260 when the plunger 230 and the connection member 260 are adjacent to each other. For example, the force member 270 may be a spring that can apply an elastic force between the plunger 230 and the connection member 260 in a direction opposing the plunger 230 and the connection member 260.

The force member 270 is arranged at the front end of the rod 250 to surround the rod 250 or to surround the joint area between the plunger 230 and the rod 250, with the front end fixed to the plunger 230. , the rear end may face the connection member 260. At this time, the inner peripheral surface of the force member 270 and the outer peripheral surface of the rod 250 may be spaced apart.

When the plunger 230 and the connecting member 260 are adjacent to each other, the rear end of the force member 270 is in contact with the connecting member 260, and a force acting backward can be applied to the connecting member 260. The normal force acting between the rod 250 and adjacent threads of the connecting member 260 may increase due to the force applied to the connecting member 260. Accordingly, the friction between the adjacent screw threads of the rod 250 and the connecting member 260 increases, thereby preventing the screw coupling between the rod 250 and the connecting member 260 from loosening.

That is, when the plunger 230 and the connecting member 260 are adjacent to each other, when a pushing force is generated between the plunger 230 and the connecting member 260 by the force member 270, it is connected to the rod 250. A screw connection between members 260 can be formed firmly.

Therefore, until the chemical solution is injected into the user, the distance between the plunger 230 and the connecting member 260 can be kept constant at a predetermined distance d, and the maximum volume of the storage space can be kept constant.

For example, as shown in FIG. 6, the plunger 230 may be positioned at the forefront (P-1) before the chemical solution is injected. At this time, the distance between the plunger 230 and the connecting member 260 may be maintained at a predetermined distance d.

As the chemical liquid flows into the reservoir 210 and the plunger 230 moves rearward, a storage space is formed, and the volume of the formed storage space may gradually increase.

As shown in FIG. 8, when the plunger 230 is located at the rearmost position (P-2), the volume of the storage space can be maximized. While the plunger 230 moves from the most forward position (P-1) to the most rearward position (P-2) of the plunger 230, the force member 270 pushes between the plunger 230 and the connection member 260. It can create strength. The force generated by the pressing member 270 strengthens the screw connection between the rod 250 and the connecting member 260, thereby preventing the predetermined distance d between the plunger 230 and the connecting member 260 from changing. You can.

As the predetermined distance d between the plunger 230 and the connecting member 260 is maintained constant, the maximum volume of the storage space formed when the plunger 230 is located at the rearmost position (P-2) is kept constant. can be formed. By keeping the maximum volume of the storage space constant, a fixed amount of medicine can be injected into the user.

For example, if the screw connection between the rod 250 and the connecting member 260 is not strong and the distance between the plunger 230 and the connecting member 260 becomes longer than the predetermined distance d, the reservoir 210 With all the chemical liquid flowing in, the plunger 230 may be positioned forward from the rearmost position (P-2). This means that the maximum volume of the storage space is reduced and a smaller amount of medication is injected into the user.

Alternatively, when the distance between the plunger 230 and the connecting member 260 becomes shorter than the predetermined distance d, the plunger 230 is moved to the rearmost position (P) with all the chemical liquid flowing into the reservoir 210. It can be located posterior to -2). This means that the maximum volume of the storage space increases and a larger amount of medication than the specified amount is injected into the user.

The force member 270 stores a fixed amount of chemical solution in the reservoir 210 by strengthening the screw connection between the plunger 230 and the connecting member 260 and the rod 250 and the connecting member 260. It is possible to ensure that a certain amount of chemical solution is supplied.

Referring to Figures 6 and 8 to 10, before attaching the medicine injection device to the user, the medicine is stored in the reservoir 210, and then the medicine is discharged from the reservoir 210 with a needle to inject the medicine into the user. The process is explained as follows.

<Chemical storage step>

A user may inject a chemical solution into the reservoir assembly 200 of the chemical injection device using an external chemical injector (not shown). Referring to FIG. 6, before injecting a chemical solution, a plunger 230 is disposed at the front end of the reservoir 210, and a rod 410 is assembled to the connection member 260 at the rear end of the plunger 230. At this time, the clutch unit is in an inactive state and the coupler 510 does not grip the connection member 260, so the drive wheel 420 is not connected to the rod 410.

When the chemical solution begins to flow from the chemical solution injector into the reservoir 210, it flows between the inner surface of the reservoir 210 and the plunger 230, and the plunger 230 can be pushed backward. As the plunger 230 moves rearward, a storage space is formed between the reservoir 210 and the plunger 230, and as the chemical solution flows in, the size of the storage space may gradually increase. When the plunger 230 moves backward and reaches the rearmost position (P-2), where it can no longer move, the size of the storage space becomes maximum, and the chemical solution may no longer flow.

<Attachment step>

As shown in FIG. 8, when all of the chemical solution D is stored in the reservoir 210, the chemical injection device can be attached to the user.

The user can attach the drug injection device 10 to the user, rotate the needle assembly, and insert the needle and cannula into the skin. The needle is inserted into the skin along with the cannula and can guide the cannula into the skin.

The needle is then withdrawn from the skin, but remains connected to the cannula. As the user further rotates the needle assembly, the needle moves upward with the cannula inserted into the skin. The cannula and the needle are at least partially connected, and form and maintain a path through which the medicinal solution moves.

The force member can firmly maintain the screw connection between the rod and the connection member between the plunger and the connection member while the plunger moves rearward due to the inflow of the chemical solution and is located at the rearmost position (P-2). Accordingly, the position of the plunger 230 relative to the connection member 260 can be maintained.

<Chemical injection step>

At substantially the same time as the cannula and needle are inserted into the user, the drive module and drive unit 400 are driven. The chemical solution injection device can inject the chemical solution (D) into the user according to a set cycle and injection amount.

When the user rotates the needle assembly to insert the needle and cannula into the skin, the trigger unit may drive the drive module. When the drive module is driven, the connector rotates around the rotation axis to rotate the drive wheel 420. The connector can rotate the driving wheel 420 in units of 1 tooth while alternately applying force to the first connection end 421 and the second connection end 422.

When the user rotates the needle assembly, the trigger unit may activate the clutch unit 500. As shown in FIG. 9, when the clutch unit 500 is activated and the coupler 510 grips the outside of the connecting member 260, the driving wheel 420, the coupler 510, and the connecting member 260 are one. It can be integrated into the body of. Therefore, when the driving wheel 420 rotates, the connecting member 260 also rotates, and the rod 410 can move forward due to the rotation of the connecting member 260.

As shown in FIG. 10, as the rod 410 moves forward, the plunger 230 may also move forward. Since the connection member 260 is gripped by the coupler 510, it can rotate and be fixed with respect to the longitudinal direction of the reservoir 210.

While the connecting member 260 rotates in a fixed state with respect to the longitudinal direction, the rod 410 and the plunger 230 move forward, so the plunger 230 and the connecting member 260 are gradually spaced apart and the plunger 230 ) and the connection member 260, the force caused by the force member 270 may not act.

Forward movement of the plunger 230 may discharge the chemical solution into the needle (N). Accordingly, the chemical solution may be injected into the user according to the set driving cycle and driving speed of the driving module.

The spirit of the present invention should not be limited to the above-described embodiments, and the scope of the claims described below, as well as all scopes equivalent to or equivalently changed from the claims, are within the scope of the spirit of the present invention. It will be said that it belongs.

1: Chemical injection system
10: Chemical injection device
100: Needle assembly
200: reservoir unit
300: drive module
400: drive unit
500: Clutch unit
600: Trigger absence
700: Needle cover assembly
800: Alarm unit

Claims (6)

A reservoir that provides space inside;
a plunger that is inserted into the reservoir and moves back and forth along one direction of the reservoir to form a storage space for the chemical solution;
a rod fixed to the plunger and extending in the one direction;
a connection member screwed with the rod and movable relative to the rod; and
A reservoir assembly comprising: a force member disposed to generate a pushing force between the plunger and the connection member when the plunger and the connection member are adjacent to each other.
According to claim 1,
A reservoir assembly wherein the rod has threads formed on its outer peripheral surface, and the connecting member has threads formed on its inner peripheral surface, and the rod is screwed together while being inserted into the connecting member.
According to claim 2,
The connection member is a reservoir assembly in which a thread is formed in a predetermined area.
According to claim 1,
A reservoir assembly wherein the force member is provided with a spring.
According to claim 4,
The reservoir assembly wherein the force member extends toward the connection member and wraps around the front end of the rod with the front end fixed to the plunger.
a reservoir assembly in which the chemical liquid is stored;
a needle assembly fluidly connected to the reservoir assembly to discharge the chemical solution; and
a driving unit connected to the reservoir assembly and moving the chemical solution from the reservoir to the needle assembly when driven; Contains,
The reservoir assembly,
A reservoir that provides space inside;
a plunger that is inserted into the reservoir and moves back and forth along one direction of the reservoir to form a storage space for the chemical solution;
a rod fixed to the plunger and extending to the opposite side of the storage space;
A connection member screwed to the rod and movable relative to the rod; and
A chemical injection device comprising: a force member disposed to generate a pushing force between the plunger and the connection member when the plunger and the connection member are adjacent to each other.

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