KR102528584B1 - 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 storing a drug solution in an internal space, and an interior of the reservoir a plunger disposed in the reservoir and moving along the longitudinal direction of the reservoir according to the amount of the chemical solution stored in the reservoir, and a first sensor unit measuring the amount of the chemical solution stored in the reservoir according to the movement of the plunger include

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.

US Patent Application Publication No. US2007/0128664 (2017.05.11.)

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, a reservoir fluidly connected to the needle assembly, and storing a chemical solution in an internal space, and disposed inside the reservoir, a plunger that moves along the length of the reservoir according to the amount of the chemical solution stored in the reservoir, and a first sensor unit that measures the amount of the chemical solution stored in the reservoir according to the movement of the plunger; An injection device is provided.

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

In addition, the connector member may be electrically connected to at least one of the pair of contact ends to sense a predetermined storage amount of the liquid medicine.

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

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

In the chemical liquid injection device according to an embodiment of the present invention, when the chemical liquid is filled to a certain extent in the reservoir, it is preheated to increase driving efficiency. When the first sensor unit senses that the amount of the chemical solution injected into the reservoir exceeds or exceeds the first standard amount, the chemical solution injection device prepares to drive some parts in the first mode, and immediately when the drug solution injection device is attached to the user. You can inject medicine.

The chemical solution injection device according to an embodiment of the present invention may sense and notify the user when the chemical solution stored in the reservoir falls below a predetermined range. When the first sensor unit senses that the amount of the chemical solution stored in the reservoir falls below or below the second reference amount, the chemical solution injection device drives the second sensor unit and/or the encoder unit to determine the amount of the chemical solution remaining in the reservoir. Precise counting and information about this can be delivered to the user. 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 perspective view showing some configurations of FIG. 3 .
Figure 5 is a perspective view showing one side of Figure 4;
6 and 7 are plan views illustrating driving for sensing the flow rate of the reservoir.
Fig. 8 is a block diagram showing some configurations of the chemical solution injection device of Fig. 2;
9 to 12 are cross-sectional views illustrating a drive for injecting a chemical solution into a reservoir, storing the chemical solution, and discharging the chemical solution through a needle.
13 is a graph showing a change in the amount of chemical liquid and a change in driving mode according to driving of the chemical liquid injection device.
14 is a plan view showing a part of a chemical solution injection device 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.

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. 4 shows a part of the configuration of FIG. It is a perspective view, and FIG. 5 is a perspective view showing one side of FIG.

Referring to FIGS. 2 to 5 , 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 set 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 It may include a cover assembly 700, an alarm unit 800 and a plurality of sensor units.

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.

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 sensor units 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 may move in an axial direction by rotation of the sleeve 110.

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

Since the cannula has a conduit shape capable of accommodating the needle (N), the liquid discharged from the needle (N) can be injected into the user.

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

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

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, a sealing ring 240, and a connector member 250 (see FIG. 6).

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 can move through an opening (not shown) disposed in the cap cover 220 (FIG. see 9).

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

The plunger 230 is disposed inside the reservoir 210 and can move linearly by driving the driving module 300 and the driving unit 400 . As the plunger 230 advances, the chemical 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 210F 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 be connected to the connector member 250 extending backward. The connector member 250 may be installed on the plunger 230 and move linearly along with the linear movement of the plunger 230 .

The connector member 250 may be made of a material having electrical conductivity and may have a shaft shape. When the connector member 250 moves and contacts the first sensor unit 910A, the storage amount of the drug may be measured or the drug injection device 10 may be started to operate.

The connector member 250 is connected to the rear end of the plunger 230 and may move along with the movement of the plunger 230 . In the drawings, the connector member 250 is shown to have a shaft shape, but is not limited thereto and may have various shapes that generate electrical signals by contacting the first sensor unit 910A.

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

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. When the plunger 230 moves, the connector member 250 may also linearly move.

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 16, and the number of rotations or rotational speed of the drive unit 400, the amount of chemical liquid stored in the reservoir 210, and the user are informed based on the electrical signal measured by the sensor unit. It is possible to measure data on the amount of injected chemical liquid.

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

The rod 410 is connected to the plunger 230 and extends in one direction. The rod 410 is inserted into the opening of the cap cover 220, and the rod 410 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 driven and connected to the driving module 300 by the connector CN, the driving module 300 drives the driving wheel 420. ) can rotate.

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

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

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

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, and is spaced apart from the connecting member 520 at a predetermined interval when inactive (FIGS. 9 and 10), and when activated, the rod 410 and the driving wheel ( 420) can be connected (FIGS. 11 and 12). The coupler 510 is a component capable of 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.

Referring to FIG. 9 , a screw thread is formed on the inner circumferential surface of the first section L1 of the connecting member 520, and the rod 410 is screwed only in the first section L1. In addition, the diameter of the first section L1 corresponds to the rod 410 and may have a size D1.

No thread is formed on the inner circumferential surface of the second section L2 of the connecting member 520 . Also, the diameter D2 of the second section L2 may be set larger than the diameter D1 of the first section L1. In the second section (L2), the connecting member 520 does not contact the rod 410.

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

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

As shown in FIGS. 11 and 12 , when the coupler 510 is activated, the coupler 510 grips the connecting member 520 and rotates the connecting member 520 as the drive wheel 420 rotates. Since the connecting member 520 and the rod 410 are screwed only in the first section L1, even when the driving wheel 420 rotates with a small torque, the connecting member 520 can move the rod 410 forward. can That is, since the rod 410 and the connecting member 520 are screwed only in the first section L1, the plunger 230 can be moved forward even with a slightly weak force by the driving of the driving unit 400.

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 and connected.

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 . An insertion protrusion 911 inserted into the second body 14 and fixing the needle cover assembly 900 may be disposed on one side of the first cover 710 .

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

The first cover 710 has greater rigidity than the second cover 720 . The first cover 710 is a portion exposed to the outside, and is formed of a material 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 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 under 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.

6 and 7 are plan views showing a drive for sensing the flow rate of the reservoir 210, and FIG. 8 is a block diagram showing a part of the configuration of the chemical solution injection device 10 of FIG.

Referring to FIGS. 4 to 8 , a plurality of sensor units may measure driving of the chemical solution injection device 10 . The plurality of sensor units measure the storage amount of the chemical liquid in the reservoir 210, whether the drive module 300 is driven, whether the drive unit 400 is driven, the rotation angle of the drive wheel 420, and the plunger 230. You can measure distance, etc.

Each of the sensor units may have a plurality of contact ends. The contact terminal may measure each event or data by measuring electrical contact.

The position of one end of the contact end may be changed by contact with another part, and may return to its original position by restoring force when contact with the other part is released.

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

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

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

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

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

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

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

Referring to FIGS. 6, 9, and 10, in the process of injecting the chemical solution D into the reservoir 210, the connector member 250 first contacts the first contact end 911 at the first position P1. (the plunger 230 is at the P-1 position), and then the connector member 250 contacts the second contact end 912 at the second position P2 (the plunger 230 is at the P-2 position).

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

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

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

In another embodiment, the connector member 250 may contact at least one of the contact ends of the first sensor unit 910A to generate an electrical signal. When the connector member 250 contacts the first contact end 911, the control module 16 recognizes the first event, and when the connector member 250 contacts the second contact end 912, the control module 16 may recognize the second event.

For example, the connector member 250 may contact the first contact end 911 to wake up the chemical solution injection device 10, and contact the second contact end 912 to release the chemical solution stored in the chemical solution injection device 10. The amount of storage can be sensed.

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

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

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

In detail, when the second contact end 912 is disconnected, the control module 16 may generate a signal indicating that the chemical solution D stored in the reservoir 210 is insufficient. The control module 16 generates an alarm signal and transfers the alarm signal to the controller 30, the user terminal 20, and/or the alarm unit 800 so that the user can recognize the amount of liquid medicine.

In addition, when the third mode is set in the chemical solution injection device 10, the forward distance of the plunger 230 within the reservoir 210 using the second sensor unit 920 and/or the encoder unit 930. is accurately measured, and the amount of chemical solution stored in the reservoir 210 can be accurately measured and monitored.

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

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

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

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

Since the size of t1 is set larger than the size of t3, when the connector member 250 moves backward along the center line CL, it contacts the first contact end 911 at the point P1 and the first contact end 911 at the point P2. 2 contact ends 912 may be contacted. Further, when the connector member 250 moves forward along the center line CL, contact with the second contact end 912 is released at the point P2 and contact with the first contact end 911 is released at the point P1. It can be.

The second sensor unit 920 may sense whether the driving module 300 and/or the driving unit 400 are driven. The driving module 300 and the driving wheel 420 are drivenly connected by a connector CN. When the drive module 300 moves linearly, the connector rotates repeatedly around the rotation axis, and both ends of the connector CN connect the first connection end 421 and the second connection end 422 of the drive wheel 420. The driving wheel 420 is rotated by applying an alternating force. The second sensor unit 920 may measure whether or not the connector CN rotates about the rotation axis and the number of rotations.

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

The second sensor unit 920 may have a 1A contact end 921 and a 2A contact end 922 . When the connector CN contacts the 1A contact end 921, the second sensor unit 920 applies the connector CN to either the first connection end 421 or the second connection end 422. to be measured as In the second sensor unit 920, when the connector CN contacts the 2A contact end 922, the connector CN applies the other one of the second connection end 422 and the second connection end 422. to be measured as

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

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

The 1B contact end 931 is disposed at the end of the base cover 933 and can always maintain contact with the base cover 933 . The 1B contact end 931 may selectively maintain contact with the cover end 933A.

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

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

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

In one embodiment, the width W1 of the tooth end 933B may be set smaller than the distance W2 between adjacent tooth ends. Since the width of W1 is set to be greater than the width of W2, an error generated when the contact end 2B contacts the tooth end 933B can be reduced.

The encoder unit 930 may measure whether the second sensor unit 920 is properly driven by sensing the rotation of the driving wheel 420 . If the rotation of the driving wheel 420 is measured by the encoder unit 930 when the drug injection device 10 is normally operating, the second sensor unit 920 should also contact the connector CN. If it is measured by the encoder unit 930 that the driving wheel 420 does not rotate, the second sensor unit 920 should not also contact the connector CN. Therefore, by comparing the signal measured by the encoder unit 930 and the signal measured by the second sensor unit 920, the encoder unit 930 may check the error of the second sensor unit 920.

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

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

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

<Drug Storage Step>

A user injects a chemical solution into the reservoir unit 200 of the chemical solution injection device 10 using an external chemical solution injector (not shown). Referring to FIG. 9 , 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 puts the drug D to be injected into a drug injector (not shown) and inserts the drug injector into the inlet end 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 chemical liquid starts to flow into the reservoir 210 from the chemical liquid injector, the remaining gas is pushed out through the needle N while being introduced 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.

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

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

In one embodiment, when the connector member 250 electrically connects the first contact end 911 and the second contact end 912, the first mode is driven. The first mode is an AWAKE mode to wake up the chemical solution injection device 10, and may preheat the chemical solution injection device 10 in advance so as to be immediately driven when the drug injection device 10 is attached to the user. In addition, the user may be notified through the user terminal 20 that the preset first reference amount of the chemical solution D is stored in the reservoir 210, thereby informing the user to use the chemical solution injection device 10 in advance.

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

<Attach step>

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

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

Then, the needle (N) is withdrawn from the skin, but remains connected to the cannula. When the user further rotates the needle assembly 100, the needle N moves upward while the cannula is inserted into the skin. At least a part of the cannula and the needle N is connected, and forms and maintains a path through which the liquid medicine moves.

<Drug Injection Step-Second Mode>

The driving module 300 and the driving unit 400 are driven at substantially the same time as the cannula and the needle N are inserted into the user. In the second mode, the chemical solution injection device 10 may inject the chemical solution D into the user according to the set cycle and injection amount.

When the user rotates the needle assembly 100 to insert the needle N and the cannula into the skin, the trigger unit 600 drives the driving module 300. When the driving module 300 is driven, the connector CN rotates the driving wheel 420 while rotating about the pivot axis. The connector CN may rotate the driving wheel 420 in units of 1 tooth while alternately applying pressure to the first connection end 421 and the second connection end 422 .

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

When the rod 410 moves forward, the plunger 230 may also move forward, and the liquid medicine may be discharged through the needle N. Therefore, the drug may be injected into the user according to the set driving cycle and driving speed of the driving module 300 .

At this time, the second sensor unit 920 may measure rotation of the connector CN. The 1A contact end 921 and the 2A contact end 922 of the second sensor unit 920 alternately contact the corresponding ends of the connector CN. The second sensor unit 920 senses contact between the 1A contact end 921 and one end of the connector CN, and senses contact between the 2A contact end 922 and the other end of the connector CN.

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

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

When the drive wheel 420 rotates, the encoder unit 930 may measure the rotation angle and rotation speed of the drive wheel 420 . The 1B contact end 931 maintains electrical contact with the cover end 933A, but the 2B contact end 932 maintains electrical contact with the tooth end 933B, but is in electrical contact with the tooth end 933B. this can be released.

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

<Drug Injection Step-Third Mode>

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

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

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

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

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

Since the remaining amount of the chemical solution is important in the third mode, the control module 16 can calculate the injected amount of the chemical solution and the remaining amount of the chemical solution in the reservoir 210 very precisely in the third mode. In the third mode, based on the data obtained from the second sensor unit 920 and the encoder unit 930, the control module 16 accurately determines the rotation angle of the drive wheel 420 and the movement distance of the plunger 230. By measuring, the discharge amount of the chemical liquid and the amount of the chemical liquid remaining in the reservoir 210 can be strictly calculated. The residual amount of the chemical solution accurately calculated in the third mode is transmitted to the user in real time, so that the user can recognize the danger.

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

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

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

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

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

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

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

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

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

In another embodiment, when the connector member 250 comes into contact with the first contact end 911, the first sensor unit 910A senses an electrical signal, and it is estimated that the chemical solution as much as A' is stored in the reservoir 210. do. When the connector member 250 contacts the second contact end 912, the third contact end 913, and the fourth contact end 914, the first sensor units 910A are B', C', and D', respectively. It can be assumed that the medicinal solution is stored in the reservoir 210.

In one embodiment, the first to fourth contact ends 911 to 914 may be arranged at equal intervals.

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

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 to these claims fall within the scope of the spirit of the present invention. would be said to belong.

1: liquid medicine injection system
10: chemical solution injection device
100: needle assembly
200: reservoir unit
300: drive 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 storing a chemical solution in an internal space;
a plunger disposed inside the reservoir and moving along the longitudinal direction of the reservoir according to the amount of the chemical solution stored in the reservoir; and
A first sensor unit for measuring the amount of the chemical liquid stored in the reservoir according to the movement of the plunger; includes,
The plunger
A connector member mounted on one side and extending along the longitudinal direction of the reservoir;
The first sensor unit
A plurality of contact ends disposed on the movement path of the connector member; and
The connector member is in contact with the contact end according to the movement of the plunger, and senses the amount of the chemical solution stored by the movement distance of the plunger. According to claim 1,
The connector member is
An apparatus for injecting a chemical solution that is electrically connected to at least one of the pair of contact ends and senses a predetermined storage amount of the chemical solution. According to claim 1,
The contact end is
wherein the center is spaced apart from the center line of the connector member in the longitudinal direction, and the surface of the contact end is in contact with the surface of the connector member when the connector member is linearly moved. delete

Images