KR20230105614A - Reservoir assembly and apparatus for infusing medical liquid including the same - Google Patents

Abstract

The present invention provides an inner space, and a reservoir in which an inlet, an outlet, and a detection port are formed to communicate the inner space with the outside from the front, and a plunger inserted into the inner space to move forward and backward to form a storage space, And a reservoir assembly including a sensing unit coupled to the sensing sphere and sensing a preset pressure formed in the storage space may be provided.

Description

Reservoir assembly and apparatus for injecting liquid containing the same {Reservoir assembly and apparatus for infusing medical liquid including the same}

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

In general, a drug solution injection device is used to inject a drug solution such as insulin into a patient. The drug 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.

Accordingly, a nutrient solution injection device in the form of a patch that can be easily used by attaching to the patient's body for a certain period of time has been developed, and this drug injection device is attached to a part of the patient's body, such as the patient's abdomen or waist, in the form of a patch for a certain period of time. It can be used in one condition.

When the drug injection device is attached to the patient's body and the needle and cannula provided in the drug injection device are inserted into the patient's body, the drug solution stored in the drug injection device is injected into the patient's body through the needle and cannula. can

However, since a needle or a cannula is blocked by a foreign substance in a patient's body during use of the drug injection device, the drug may not smoothly flow inside the drug injection device. In this case, the drug solution may not be supplied to the patient at all or the drug solution may be supplied insufficiently, but the patient or guardian may not properly recognize whether or not the drug solution is smoothly supplied.

In order to increase the effect of the injected drug solution, a method for confirming whether the drug solution is smoothly injected into the patient is required, and research is being conducted to continuously inject a fixed amount of the drug solution in various ways.

The present invention provides a reservoir assembly that is safely driven and can accurately deliver drugs and a drug solution injection device including the same.

As a means for achieving the above-described technical problem, the reservoir assembly according to an embodiment of the present invention provides an inner space, and an inlet, an outlet, and a detection port are formed to communicate the inner space with the outside from the front. It may include a reservoir, a plunger that is inserted into the inner space and moves forward and backward to form a storage space, and a sensing unit that is coupled to the sensor and detects a predetermined pressure formed in the storage space.

In one embodiment, the sensing unit includes a cap member inserted into the sensor, and a sensing member spaced apart from the cap member and contacting the cap member by movement of the cap member to generate an electrical signal. can do.

In one embodiment, the sensing unit may further include a biasing member for biasing the cap member toward the sensor.

In one embodiment, the cap member has a packing part inserted into the sensing hole and a contact part contacting the sensing member, and the contact part may be formed of conductive rubber.

And, the chemical solution injection device according to an embodiment of the present invention is connected to a reservoir assembly in which the chemical solution is stored, a needle assembly for discharging the chemical solution moved in the reservoir assembly, and the reservoir assembly, and is driven and a driving unit generating a driving force for moving the liquid medicine from the reservoir to the needle assembly, wherein the reservoir assembly provides an internal space and communicates the internal space with the outside from an inlet, an outlet, and It may include a reservoir in which a detection sphere is formed, a plunger inserted into the inner space and moving forward and backward to form a storage space, and a sensing unit coupled to the detection sphere and sensing a predetermined pressure formed in the storage space. there is.

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

According to the chemical solution injection device according to an embodiment of the present invention, it is possible to safely inject the chemical solution into a user. While the chemical solution is being injected by the chemical solution injection device, it can be confirmed that a fixed amount of the chemical solution is properly injected.

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 view showing the reservoir assembly of FIG. 2 .
FIG. 5 is a view illustrating a sensing unit of the reservoir assembly of FIG. 4 .
6 is a view showing a state before the chemical liquid is stored in the reservoir assembly.
7 is a diagram illustrating a state in which a chemical liquid is stored in a reservoir assembly and a clutch unit is activated.
8 is a diagram illustrating a state before the sensing unit of FIG. 5 operates.
FIG. 9 is a diagram illustrating a state in which the sensing unit of FIG. 5 operates.

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 elements described in the specification exist, and do not preclude the possibility that one or more other features or elements 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 description. 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 away from the user. 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 to drive and control the liquid 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 user equipped with the drug injection device 10, and the user terminal 20 may be provided to the user or a third party. 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.

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

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

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

Referring to FIGS. 2 and 3 , the drug solution injection device 10 may inject the drug solution stored therein in a set amount to the user in a state of being attached to a user who is a target for drug solution injection.

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 a 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 assembly 200, a driving module 300, a battery 350, a driving unit 400, a trigger member 500, a needle cover assembly 600, An alarm unit 700 may be included.

In the chemical solution injection device 10, at least one body among the base bodies may form a frame supporting 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 assembly 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 assembly 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 unit (not shown) may be disposed inside the drug injection device 10 . A control unit, which is a circuit board, is disposed below the second body 14 and can control the overall operation of the chemical solution injection device 10 . The control unit may electrically contact the driving module 300, the alarm unit 700, and a plurality of sensors (not shown) to control their operations.

When the user rotates the needle assembly 100, the drug solution injection device 10 may insert the cannula into the user and activate the clutch unit to start drug injection.

The needle assembly 100 may be fluidly connected to the reservoir assembly 200 . When the clutch unit is activated, the driving force generated by the driving module is transmitted to the reservoir assembly 200, and the chemical solution stored in the reservoir assembly 200 may be injected into the user through a needle and a cannula.

The driving module 300 may be any type of device that generates driving force 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 module 300 and may supply electricity to the driving module 300 . In addition, the battery 350 is connected to the control module, and based on the electrical signal measured by the sensor unit, the number or speed of rotation of the drive unit 400, the amount of chemical liquid stored in the reservoir assembly 200, and injection to the user It is possible to measure the data on the amount of chemical liquid, etc.

The driving unit 400 is disposed between the driving module 300 and the reservoir assembly 200 so that the driving force generated by the driving module 300 is transmitted to the reservoir assembly 200, the driving module 300 and the reservoir assembly 200. The reservoir assembly 200 may be driven and connected. At this time, the connection of the drive unit 400 may be made when the clutch unit provided in the drive unit 400 is activated.

The trigger member 500 may generate a mechanical signal to inject the drug solution of the drug solution injection device 10 after the needle assembly 100 is rotated and the cannula is inserted into the user. In one embodiment, the trigger member 500 is rotatably disposed on one side of the third body 15, and a knob (not shown) of the needle assembly 100 presses the trigger member 500 so that the trigger member 500 ) can be initiated. While the trigger member 500 rotates, the coupler of the clutch unit is pressed, so that the clutch unit can be activated.

The needle cover assembly 600 may be mounted underneath the needle assembly 100 . The needle cover assembly 600 may prime air stored in the reservoir assembly 200 before injecting the chemical solution. 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 600 may have a first cover 610 , a second cover 620 , a filter member 630 and an adhesive layer 640 .

The first cover 610 may be disposed under the chemical solution injection device 10 . The second cover 620 may be inserted and assembled into the opening of the first cover 610 .

The second cover 620 is assembled to the first cover 610, and the needle and/or cannula C may be aligned in the center. The second cover 620 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 610 has greater rigidity than the second cover 620 . The first cover 610 is a portion exposed to the outside, and is formed of a material with a slightly greater rigidity. The second cover 620 is assembled to the first cover 610 and is formed of a material having less rigidity than the first cover 610 in order to be inserted into the opening of the third body 15 .

A protrusion 621 inserted into the third body 15 may be provided at the center of the second cover 620 . In addition, the second cover 620 has a fixing protrusion, and the fixing protrusion is inserted into the first cover 610 so that the first cover 610 and the second cover 620 can be assembled.

The protrusion 621 of the second cover 620 is inserted into the opening of the lower end of the third body 15 . The diameter of the protruding portion 621 is set slightly larger than the diameter of the opening. Since the second cover 620 has a predetermined elasticity, the protruding portion 621 may be inserted into the opening and fixed.

The second cover 620 has an inner diameter so that a needle and a cannula can be aligned thereon. The inner diameter of the second cover 620 forms a storage space of the second cover 620, and the chemical solution can be stored or gas can be moved and discharged.

The filter member is mounted on the second cover 620 . The filter member is disposed under the storage space of the second cover 620, gas such as air passes through the filter member, but liquid such as chemical solution does not pass through the filter member. Thus, the air discharged from the needle passes through the filter member and is discharged to the outside, but the chemical solution discharged from the needle may be stored in the storage space defined by the second cover 620 and the filter member.

The shape of the filter member may change according to the amount of chemical liquid stored in the storage space. For example, when the storage space is filled with the chemical solution, the filter member expands downward, so that the user can recognize that the chemical solution has flowed into the needle cover assembly 600 .

The adhesive layer may be disposed on one surface of the needle cover assembly 600 and attach the needle cover assembly 600 to the attachment part 12 .

The alarm unit 700 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 700 is disposed below the housing 11 and is connected to a circuit board. The alarm unit 700 may generate a warning sound or generate light to deliver an alarm to an external user.

FIG. 4 is a view showing the reservoir assembly 200 of FIG. 2 , and FIG. 5 is a view showing the sensing unit 260 of the reservoir assembly 200 of FIG. 4 .

Referring to FIGS. 4 and 5 , the reservoir assembly 200 may include a reservoir 210 , a cap cover 220 , a plunger 230 , a sealing ring 240 , and a sensing unit 260 .

The reservoir 210 may form the exterior of the reservoir assembly 200 and provide an internal space in which the plunger 230 can be accommodated.

In one embodiment, the reservoir 210 may be formed in a cylinder shape extending in the front-rear direction. A cap cover 220 is mounted at the rear of the reservoir 210 so that an internal space separated from the outside can be defined by the reservoir 210 and the cap cover 220, and an opening disposed in the cap cover 220. The connection member 432 coupled to the connector member 233 and the rod member may move through (not shown).

The plunger 230 is accommodated in the inner space and can move forward and backward. In one embodiment, the plunger 230 may move from the front to the rear by the chemical solution flowing into the inner space. And, it can move from the rear to the front by the driving force generated by the driving module. As the plunger 230 advances, the chemical solution stored in the reservoir 210 may be discharged to the needle assembly.

A part of the inner space by the reservoir 210 and the plunger 230 may be defined as a storage space for storing the liquid medicine. The volume of the storage space may be changed by the plunger 230 moving in the inner space. For example, when the plunger 230 is disposed at the forefront of the inner space so that the end end 231 and the inclined surface 232 of the plunger are in close contact with the reservoir 210, the storage space may not be formed in the inner space. And, as the chemical liquid flows into the reservoir 210, a storage space is formed, and the volume of the storage space may increase by the chemical liquid flowing into the reservoir 210. Also, as the stored chemical solution is discharged from the reservoir 210, the volume of the storage space may decrease.

The plunger 230 may be coupled with the connector member 233 extending forward and backward. The connector member 233 is installed on the plunger 230, moves along with the movement of the plunger 230, and can sense the amount of stored liquid medicine.

The plunger 230 is provided with a sealing ring 240 at a portion in contact with the inner wall of the reservoir 210, and passes between the plunger 230 and the inner wall of the reservoir 210 when the plunger 230 moves. Leakage of the chemical solution can be prevented.

A plurality of openings may be formed at the front of the reservoir 210 to communicate the internal space with the outside. The plurality of openings may be an inlet 210I, an outlet 210E, and a detection port 210S. In one embodiment, the inlet 210I, the outlet 210E, and the detection hole 210S may be formed as openings respectively penetrating the front of the reservoir 210 . In another embodiment, the inlet 210I, the outlet 210E, and the detection port 210S may communicate with the inside of the reservoir 210 through a channel 211 formed as a groove on the inner front surface of the reservoir 210. can

The inlet 210I may provide a flow path through which an external chemical solution flows into the inner space of the reservoir 210 . The first packing member 251 is disposed at the inlet 210I to pack the inlet 210I and prevent leakage of the chemical solution through the inlet 210I. The first packing member 251 prevents leakage of the chemical solution, but the chemical solution may be injected in a state where an injection needle (not shown) penetrates the first packing member 251 .

The first packing member 251 may have reclosable properties. For example, even if the needle for injection penetrates the first packing member 251 and then is removed to fill the reservoir 210 with a chemical solution, the first packing member 251 penetrates the first packing member 251 through the portion where the needle for injection invades. Leakage of the chemical solution can be prevented. The first packing member 251 may be formed of a material including, for example, polypropylene, a thermoplastic elastomer, or vegetable oil. The chemical solution injected by the injection needle may form a storage space while being introduced into the inner space of the reservoir 210 by pushing the plunger 230 backward.

A conduit (N) is connected to the outlet (210E), and the reservoir 210 may be connected to the needle assembly through the conduit (N). A second packing member 252 is provided between the outlet 210E and the conduit N, so that leakage of the chemical solution between the outlet 210E and the conduit can be prevented. The chemical solution stored in the reservoir 210 may flow to the needle assembly through the outlet 210E and the conduit.

The cap member 261 is provided in the sensor 210S, and leakage of the chemical solution stored in the reservoir 210 through the sensor 210S can be prevented.

Referring to FIG. 5 , the sensing unit 260 may include a cap member 261 , a sensing member 262 and a force member 263 .

The cap member 261 can prevent leakage of the liquid stored in the storage space through the sensor 210S while being inserted and fixed to the sensor 210S. The cap member 261 is inserted and fixed to the sensor 210S, and may be moved by a predetermined force.

In one embodiment, the cap member 261 may be inserted into and fixed to the sensor 210S by frictional force acting between the outer surface of the cap member 261 and the inner surface of the sensor 210S. At this time, the outer surface of the cap member 261 is provided in a form corresponding to the inner surface of the sensor 210S, and the cap member 261 is inserted into the sensor 210S and is an elastic material that is easy to generate frictional force. can be made with

The cap member 261 may have a packing part 261a inserted into the sensor 210S on one side and a contact part 261b contacting the sensing member 262 on the other side. The packing part 261a and the contact part 261b may be integrally manufactured at once. Alternatively, the packing part 261a and the contact part 261b may be individually manufactured and then integrally assembled.

The packing part 261a is provided in a form corresponding to the inner surface of the sensor 210S, and is inserted into the sensor 210S, between the outer surface of the packing part 261a and the inner surface of the sensor 210S. frictional force may be formed. In a state in which the packing part 261a is inserted and fixed into the sensor 210S, since one side of the packing part 261a facing the storage space may come into contact with the chemical liquid stored in the storage space, at least a portion of the packing part 261a It may be made of a material that does not react with the chemical solution and has elasticity, for example, biocompatible rubber or silicone.

The contact portion 261b is a portion in contact with the sensing member 262, and may generate a predetermined signal when the contact portion 261b and the sensing member 262 come into contact. In one embodiment, an electrical signal may be generated by contact between the contact portion 261b and the sensing member 262 . In this case, at least a portion of the contact portion 261b may be made of a material having high electrical conductivity. For example, the contact portion 261b may be a conductive metal or conductive silicone or conductive rubber manufactured by extruding a conductive metal powder such as silver or nickel into silicon or rubber.

The sensing member 262 may be spaced apart from the cap member 261 and contact the cap member 261 when the cap member 261 moves. In one embodiment, the sensing member 262 is provided as a circuit board, and the sensing member 262 and the cap member 261 may contact each other to generate an electrical signal.

A separation distance between the sensing member 262 and the contact portion 261b of the cap member 261 may be smaller than a depth at which the packing portion 261a is inserted into the sensing sphere 210S. Even if the cap member 261 moves until the contact portion 261b of the cap member 261 contacts the sensing member 262 due to a predetermined force acting on the cap member 261, the packing of the cap member 261 The portion 261a does not separate from the sensor 210S, and leakage of the chemical solution through the sensor 210S can be prevented.

The urging member 263 may urge the cap member 261 toward the sensor 210S. The force member 263 may apply force to the cap member 261 in a direction opposite to a direction in which the cap member 261 moves toward the sensing member 262 . The force member 263 is capable of applying force in one direction, and may be provided as, for example, a plate-shaped spring or a coil spring.

FIG. 6 is a view showing a state before the chemical liquid is stored in the reservoir assembly 200, and FIG. 7 shows a state where the chemical liquid D is stored in the reservoir assembly 200 and the clutch unit 430 is activated. it's a drawing

Referring to FIGS. 6 and 7 , a mechanism in which the chemical liquid D is stored in the reservoir assembly 200 and the chemical liquid D stored in the reservoir assembly 200 is discharged will be described.

As shown in FIG. 6 , before the chemical liquid is injected into the reservoir assembly 200 , the plunger 230 may be disposed in front of the inner space of the reservoir 210 . The rod member 410 coupled to the rear end of the plunger 230 may extend backward through the opening formed in the cap cover 220 together with the connecting member 432 .

The rod member 410 and the connecting member 432 may be coupled to be relatively movable with respect to each other. In one embodiment, the rod member 410 and the connecting member 432 may be screwed together by a screw thread formed on an outer circumferential surface of the rod member 410 and a screw thread formed on an inner circumferential surface of the connecting member 432 . The rod member 410 and the connecting member 432 are movable at the same time, and the rod member 410 can move relatively linearly with respect to the connecting member 432 by rotation of the connecting member 432 .

In the inactive state of the clutch unit 430, since the coupler 431 does not grip the connecting member 432, the driving wheel 420 is not engaged with the connecting member 432, and the connecting member 432 is the driving wheel ( 420) can move regardless of the operation. At this time, the rod member 410 screwed to the connecting member 432 may move together with the connecting member 432 .

The chemical solution may flow into the reservoir 210 through an inlet 210I formed in front of the reservoir 210 by a separately provided drug injector. At this time, the chemical liquid is introduced between the reservoir 210 and the plunger 230, the plunger 230 is pushed backward to form a storage space, the volume of the storage space is gradually increased, and the plunger 230 is moved backward. can The rod member 410 and the connection member 432 connected to the plunger 230 may move backward along with the movement of the plunger 230 .

As shown in FIG. 7 , when the injection of the chemical solution D into the reservoir 210 is completed, the plunger 230 may be disposed behind the inner space of the reservoir 210 .

The clutch unit 430 includes a coupler 431 and a connecting member 432 and is disposed between the driving wheel 420 and the rod member 410 to enable their driving connection. In one embodiment, when the clutch unit 430 is deactivated, the coupler 431 may be spaced apart from the connecting member 432 at a predetermined distance while being located outside the connecting member 432 . When the clutch unit 430 is activated, the coupler 431 can apply pressure to the outer side of the connecting member 432, and at this time, the connecting member 432 is driven and connected to the driving wheel 420 so that the driving wheel 420 It can rotate along with rotation. Also, by rotation of the connecting member 432, the rod member 410 screwed with the connecting member 432 may move forward.

When the rod member 410 moves forward, the plunger 230 moves forward together with the rod member 410 and discharges the chemical solution D stored in the storage space to the needle assembly.

FIG. 8 is a diagram showing a state before the sensing unit 260 of FIG. 5 operates, and FIG. 9 is a diagram showing a state of the sensing unit 260 of FIG. 5 operating.

When the chemical solution injection device in which the chemical solution is stored is attached to a user, the driving wheel 420 is rotated by the driving force generated by the driving module, the connecting member 432 drivingly connected to the driving wheel 420 is rotated, and the rod member 410 and plunger 230 can move forward. Among the openings formed in the reservoir 210, the rest of the openings except for the outlet are packed, and as the plunger 230 moves forward, the chemical solution stored in the storage space of the reservoir 210 can move to the needle assembly through the outlet. there is.

Referring to FIG. 8 , the sensor 210S may be packed by the cap member 261 of the sensing unit 260 while the stored chemical solution is discharged from the storage space through the outlet.

With the cap member 261 inserted into the sensor 210S, the cap member 261 may be fixed to the sensor 210S by the frictional force formed between the cap member 261 and the sensor 210S. there is.

In addition, the urging member 263 contacts one side of the cap member 261 and urges the cap member 261 in one direction so that the cap member 261 does not move in a state in which the cap member 261 is inserted and fixed into the sensor 210S. can

The sensing member 262 may generate a signal by the movement of the cap member 261 . In one embodiment, the sensing member 262 may be spaced apart from the cap member 261 to generate an electrical signal according to the displacement of the cap member 261 . For example, the sensing member 262 may generate an electrical signal according to a contact with the cap member 261 or a change in capacitance between the sensing member 262 and the cap member 261 .

When the stored chemical liquid is normally discharged from the storage space of the reservoir 210, the cap member 261 may maintain a state of being spaced apart from the cap member 261 while being inserted and fixed to the sensor 210S.

The needle of the needle assembly may be blocked by foreign substances inside the user while the device is operating and the drug solution is being injected. At this time, since the plunger continues to move forward by the driving force generated by the driving module, the pressure in the storage space may gradually increase due to the movement of the plunger.

Referring to FIG. 9 , when the pressure formed in the storage space gradually increases and reaches a predetermined value, the cap member 261 may move by the pressure formed in the storage space.

Due to the pressure formed in the storage space, the cap member 261 may generate an electrical signal while being pushed away from the sensor 210S. In one embodiment, an electrical signal may be generated while the cap member 261 and the sensing member 262 contact each other.

The drug solution injection device may be controlled according to the signal. In one embodiment, when a contact signal between the sensing member 262 and the cap member 261 is generated, the operation of the driving module may be stopped to stop the advancement of the plunger. And, by activating the alarm unit, the user may be notified of the malfunction through sight, hearing, or tactile sense. For example, it may generate a warning sound, light, or vibration.

A depth at which the cap member 261 is inserted into the sensor 210S may be greater than a distance traveled by the cap member 261 . Even if the cap member 261 is pushed until it comes into contact with the sensing member 262 due to the pressure formed in the storage space, a portion of the cap member 261 is still inserted into the sensing port 210S to detect the sensing port 210S. Through this, it is possible to prevent leakage of the chemical solution.

Considering the frictional force formed between the cap member 261 and the sensor 210S, the force applied by the urging member 263 to the cap member 261, and the depth at which the cap member 261 is inserted into the sensor 210S , it is possible to determine a preset value of the pressure formed in the storage space.

As such, the present invention has been described with reference to one embodiment shown in the drawings, but this is merely exemplary, and those skilled in the art will understand that various modifications and variations of the embodiment are possible therefrom. Therefore, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims.

1: liquid medicine injection system
10: chemical solution injection device
100: needle assembly
200: reservoir assembly
300: driving module
400: drive unit
500: absence of trigger
600: needle cover assembly
700: alarm unit

Claims (5)

a reservoir providing an internal space and having an inlet, an outlet, and a detection port for communicating the internal space with the outside from the front;
a plunger that is inserted into the inner space and moves forward and backward to form a storage space; and
A sensing unit coupled to the sensing sphere and sensing a predetermined pressure formed in the storage space; including,
reservoir assembly. According to claim 1,
The sensing unit,
a cap member inserted into the sensor; and
A sensing member disposed spaced apart from the cap member and generating an electrical signal by coming into contact with the cap member by movement of the cap member.
reservoir assembly. According to claim 2,
The sensing unit further includes a pressing member for pressing the cap member toward the sensing sphere.
reservoir assembly. According to claim 2,
The cap member has a packing portion inserted into the sensing hole and a contact portion contacting the sensing member,
The contact portion is formed of conductive rubber,
reservoir assembly. a reservoir assembly in which a liquid medicine is stored;
a needle assembly discharging the chemical liquid moved from the reservoir assembly; and
A driving unit connected to the reservoir assembly and generating a driving force for moving the liquid medicine from the reservoir to the needle assembly when driven;
The reservoir assembly,
a reservoir providing an internal space and having an inlet, an outlet, and a detection port for communicating the internal space with the outside from the front;
a plunger that is inserted into the inner space and moves forward and backward to form a storage space; and
A sensing unit coupled to the sensing sphere and sensing a predetermined pressure formed in the storage space; including,
liquid injection device.

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