KR102795646B1 - Apparatus for Infusing medical liquid - Google Patents

Abstract

The present invention provides a drug injection device, comprising: a base body; a needle assembly mounted on the base body; a reservoir unit fluidly connected to the needle assembly and having a plunger therein; a driving unit that receives power from the outside to linearly move the plunger and has a connecting end along a longitudinal central axis; and a driving sensing unit that can contact the connecting end and reciprocates in a preset direction as the driving unit is driven and detects driving of the driving unit.

Description

{Apparatus for Infusing medical liquid}

The present invention relates to a drug injection device.

Typically, drug infusion devices, such as insulin infusion devices, are used to inject drug solutions into a patient's body. These drug infusion devices are sometimes used by medical professionals such as doctors or nurses, but in most cases, they are used by laypeople such as the patients themselves or their guardians.

Diabetic patients, especially pediatric diabetics, need to inject medications such as insulin into their bodies at set intervals. A patch-type medication injection device that is attached to the body for a set period of time is being developed, and this medication injection device can be used by attaching it to the patient's body, such as the abdomen or waist, for a set period of time in the form of a patch.

In order to increase the effectiveness through drug injection, the drug injection device needs to be controlled to precisely inject the drug into the patient's body. It is important to precisely inject small amounts of drug using a 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 operate with low power. In particular, since the drug injection device is used by attaching it directly to the patient's skin, it is important for the user to operate the drug injection device conveniently and safely.
The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2021-0077491 (published on June 25, 2021, title of the invention: Drug injection device with operating time symmetry algorithm applied, operating time symmetry method, and recording medium thereof).

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

One aspect of the present invention provides a drug injection device including: a base body; a needle assembly mounted on the base body; a reservoir unit fluidly connected to the needle assembly and having a plunger therein; a driving unit that receives power from the outside to linearly move the plunger and has a connecting end provided along a longitudinal central axis; and a driving sensing unit that is contactable with the connecting end, reciprocates in a preset direction as the driving unit is driven, and detects driving of the driving unit.

In addition, the driving sensing unit may include a sensing moving unit that is capable of contacting the connecting end and moving by receiving power from the driving unit; a driving sensing main body unit that is connected to the sensing moving unit and capable of reciprocating movement; and a contact end that is arranged to be capable of contacting the driving sensing main body unit.

In addition, the contact terminals are provided in multiple numbers, and one of the multiple contact terminals maintains a state of being in contact with the driving sensing main body, and another of the multiple contact terminals can be in contact with the driving sensing main body as the driving sensing main body moves.

Additionally, the contact end may have elasticity.

In addition, the above connecting members may be provided in multiple numbers and arranged along the longitudinal central axis of the driving unit.

A drug injection device according to one embodiment of the present invention has the effect of being able to confirm whether the device is operating normally and whether the driving unit has operated once.

In addition, there is an effect that can accurately measure whether the driving unit, which receives power from the driving module and rotates, has rotated only by a preset range.

In addition, since the drive sensing unit is arranged to be in contact with a plurality of connecting ends formed in the drive wheel unit alternately as the drive wheel unit rotates, there is an effect of being able to sense the operation of the drive unit that receives power from the drive module.

In addition, the encoder unit can accurately measure data regarding the rotation of the driving wheel unit to sense whether the liquid injection device is operating normally.

FIG. 1 is a block diagram illustrating a drug injection system according to one embodiment of the present invention.
FIG. 2 is a perspective view illustrating a drug injection device according to one embodiment of the present invention.
FIG. 3 is an exploded perspective view showing a housing in an open state in a liquid injection device according to one embodiment of the present invention.
Figure 4 is a perspective view illustrating a part of the configuration of Figure 3.
Figure 5 is a partial plan view partially illustrating one side of Figure 4.
FIG. 6 is a perspective view illustrating a driving wheel unit and a driving sensing unit according to one embodiment of the present invention.
Fig. 7 is a block diagram illustrating a part of the configuration of the drug injection device of Fig. 2.
Figures 8 and 9 are drawings showing the operating state in part A of Figure 5.
Figures 10 and 11 are cross-sectional drawings taken along line II` of Figures 8 and 9.
FIG. 12 is an exploded perspective view illustrating a plunger and a drive unit according to one embodiment of the present invention.
FIG. 13 is a cross-sectional view illustrating a state before a drug is stored in a reservoir unit according to one embodiment of the present invention.
FIG. 14 is a cross-sectional view illustrating a state in which a drug solution is stored in a reservoir unit according to one embodiment of the present invention.

The present invention can be modified in various ways and has various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention and the methods for achieving them will become clear with reference to the embodiments described in detail below together with the drawings. However, the present invention is not limited to the embodiments disclosed below, and can be implemented in various forms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same drawing reference numerals and redundant descriptions thereof are omitted.

In the examples below, singular expressions include plural expressions unless the context clearly indicates otherwise.

In the examples below, terms such as “include” or “have” mean that a feature or component described in the specification is present, and do not exclude in advance the possibility that one or more other features or components may be added.

In some embodiments, where the implementation is otherwise feasible, a particular process sequence may be performed in a different order than the one described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the one described.

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

FIG. 1 is a block diagram illustrating a drug injection system according to one embodiment of the present invention.

Referring to FIG. 1, a drug injection system according to one embodiment of the present invention may include a drug injection device, a user terminal, a controller, and a biometric information sensor. The drug injection system may enable a user to drive and control the system using the user terminal, and may periodically inject a drug from the drug injection device based on blood sugar information monitored by the biometric information sensor.

Referring to Fig. 1, the drug injection device (1) also performs the function of injecting drugs to be injected into the user, such as insulin, glucagon, anesthetic analgesics, dopamine, growth hormones, smoking cessation aids, etc., based on data sensed by the bio-information sensor (40).

In addition, the liquid injection device (1) can transmit a device status message including information on the remaining battery (350) capacity of the device, whether the device was booted successfully, whether the liquid (D) was injected successfully, etc., to the controller (30).

Messages transmitted to the controller (30) may be transmitted to the user terminal (20) via the controller (30). Alternatively, the controller (30) may transmit improved data created by processing the received messages to the user terminal (20).

A drug injection device (1) according to one embodiment of the present invention is provided separately from a bio-information sensor (40) and can be installed away from the subject of use.

As an optional embodiment, the drug injection device (1) and the bio-information sensor (40) may be provided in one device.

As an optional embodiment, the drug injection device (1) can be mounted on the user's body. In addition, the drug injection device (1) can be mounted on not only humans but also animals to inject the drug (D).

The user terminal (20) can input and receive an input signal from a user to drive and control the drug injection system (1). The user terminal (20) can generate a signal to drive the controller (30) to control the controller (30), and can drive the drug injection device (1) by controlling the controller (30).

Additionally, the user terminal (20) can display biometric information measured from the biometric information sensor (40) and can display status information of the drug injection device (1).

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

The user terminal (20) can be connected one-to-one with a pre-registered controller (30). The user terminal (20) can be connected to the controller (30) in an encrypted manner 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 provided as separate devices, each separately. For example, the controller (30) may be provided to a subject equipped with a drug injection device (1), and the user terminal (20) may be provided to the subject or a third party. The user terminal (20) may be driven by a guardian, thereby increasing the safety of the drug injection system (1).

In another embodiment, the user terminal (20) and the controller (30) may be provided as a single device. The user terminal (20) and the controller (30) provided as a single device may communicate with the drug injection device (1) to control the injection of the drug.

The controller (30) performs a function of transmitting and receiving data with the drug injection device (1), and can transmit a control signal related to the injection of a drug such as insulin to the drug injection device (1), and receive a control signal related to the measurement of a biological value such as blood sugar from a biological information sensor (40).

In one embodiment, the controller (30) may transmit an instruction request to measure the current state of the user to the drug injection device (1) and receive measurement data from the drug injection device (1) in response to the instruction request.

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

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

The user terminal (20), the controller (30), and the drug injection device (1) can perform communication using a network. For example, the network includes a local area network (LAN), a wide area network (WAN), a value added network (VAN), a mobile radio communication network, a satellite communication network, and a combination thereof, and is a comprehensive data communication network that allows each network component to communicate smoothly with each other, and may include wired Internet, wireless Internet, and a mobile radio communication network. In addition, the wireless communication may include, but is not limited to, wireless LAN (Wi-Fi), Bluetooth, Bluetooth low energy, Zigbee, WFD (Wi-Fi Direct), UWB (ultra-wideband), infrared communication (IrDA, infrared Data Association), NFC (Near Field Communication), 5G, etc.

FIG. 2 is a perspective view illustrating a liquid injection device according to an embodiment of the present invention. FIG. 3 is an exploded perspective view illustrating a state in which a housing is opened in the liquid injection device according to an embodiment of the present invention. FIG. 4 is a perspective view illustrating a part of the configuration of FIG. 3. FIG. 5 is a partial plan view illustrating a side of FIG. 4. FIG. 6 is a perspective view illustrating a driving wheel unit and a driving sensing unit according to an embodiment of the present invention. FIG. 7 is a block diagram illustrating a part of the configuration of the liquid injection device of FIG. 2. FIGS. 8 and 9 are drawings illustrating an operating state in part A of FIG. 5. FIGS. 10 and 11 are cross-sectional views taken along the line I-I` of FIGS. 8 and 9. FIG. 12 is an exploded perspective view illustrating a plunger and a driving unit according to an embodiment of the present invention. FIG. 13 is a cross-sectional view illustrating a state before a liquid is stored in a reservoir unit according to an embodiment of the present invention. FIG. 14 is a cross-sectional view illustrating a state in which a drug solution is stored in a reservoir unit according to one embodiment of the present invention.

Referring to FIGS. 2 to 5, a drug injection device (1) according to one embodiment of the present invention can be attached to a user who is to inject a drug (D), and can inject a drug (D) stored inside the device to the user in a preset amount.

The drug injection device (1) can be used for various purposes depending on the type of drug (D) to be injected. For example, the drug (D) can include an insulin-based drug (D) for diabetic patients, and can also include other types of drug (D) for the pancreas, heart, and other types of drug (D).

A drug injection device (1) according to one embodiment of the present invention may include a housing (11), an attachment part (12), and a base body. Referring to FIGS. 2 to 4, a housing (11) according to one embodiment of the present invention may cover a needle assembly (100), a reservoir unit (200), a driving module (300), a driving unit (400), a needle driving part (600), an alarm unit (800), and a sensor unit (900) to be described later, and an accommodation space may be formed inside.

Referring to FIGS. 2 to 4, the attachment portion (12) according to one embodiment of the present invention may be positioned adjacent to the user's skin. A separate bonding means may be further interposed between the attachment portion (12) and the user's skin, and the drug injection device (1) may be fixed to the skin by the bonding means.

Referring to FIGS. 2 to 14, a drug injection device (1) according to one embodiment of the present invention may include a needle assembly (100), a reservoir unit (200), a driving module (300), a battery (350), a driving unit (400), a needle driving unit (600), an injection cover (700), an alarm unit (800), and a sensor unit (900).

Referring to FIGS. 2, 3, and 4, a drug injection device (1) according to one embodiment of the present invention may include a base body (drawing symbol not set).

The base body can form a frame that supports internal components through at least one body. Specifically, the base body can include a first body (13), a second body (14), a third body (15), and a body cover (16), and the first body (13), the second body (14), the third body (15), and the body cover (16) can be distinguished according to the arrangement.

The first body (13) is placed below the housing (11), and a needle assembly (100), a reservoir unit (200), a driving module (300), a battery (350), etc. can be supported in each opening or groove. The second body (14) is placed on the lower side (based on FIG. 3) of the first body (13), can be connected to the attachment part (12), and can cover the lower part of the liquid injection device (1).

The third body (15) is arranged on the upper side of the first body (13), and a reservoir unit (200), a driving module (300), a battery (350), a driving unit (400), etc. can be supported in each opening or groove. The body cover (16) is arranged on the upper side of the third body (15) and can cover the third body (15).

Specifically, the body cover (16) can be fastened to the third body (15) by a fastening member such as a bolt, and can cover the wing end (421) of the driving wheel part (420) and the driving module (300) to be described later.

Referring to FIG. 3, the drawing illustrates a first body (13), a second body (14), a third body (15), and a body cover (16), but is not limited thereto and various modifications are possible, such as being provided as an integral unit.

Referring to FIGS. 10 and 11, a control module (17) may be placed inside a drug injection device (1) according to one embodiment of the present invention. Specifically, the control module (17) may be placed as a circuit board under the second body (14) and may control the overall operation of the drug injection device (1).

A control module (17) according to one embodiment of the present invention can electrically contact a driving module (300), a battery (350), an alarm unit (800), and a sensor unit (900) to control their operation.

Referring to FIGS. 3, 4, and 5, a needle assembly (100) according to one embodiment of the present invention can be mounted on a base body, specifically, a first body (13). The needle assembly (100) can move a needle (N) and/or a cannula in the axial direction by rotation of a sleeve (drawing symbol not set).

One end of the needle (N) is connected to a reservoir unit (200) so that the drug (D) can be delivered, and the other end is inserted into a cannula and can move along the cannula. Since the cannula has a hollow tube shape so that it can accommodate the needle (N) inside, the drug (D) discharged from the needle (N) can be injected into the user.

The cannula remains inserted into the user's skin, but the needle (N) moves upward within the cannula, i.e. away from the user's skin, and is separated from the target.

However, the cannula and the needle (N) form a path through which the fluid moves, so the drug (D) injected from the reservoir can be injected into the user through the needle (N) and the cannula.

Referring to FIGS. 2 to 5, a needle assembly (100) according to one embodiment of the present invention can receive power from a needle drive unit (600) to move a needle (N) and/or a cannula.

A needle driving unit (600) according to one embodiment of the present invention can transmit power to a needle assembly (100) in a pressing manner and may be provided with an elastic member having elastic restoring force.

Accordingly, when the user applies force to the needle drive unit (600), power is transmitted to the needle assembly (100) connected to the needle drive unit (600), and the needle (N) and/or cannula are inserted into the user's skin, and when the force applied to the needle drive unit (600) by the user is removed, the needle drive unit (600) moves to the original position by the elastic restoring force of the elastic member, and only the needle (N) can be separated from the user's skin.

The needle drive unit (600) according to one embodiment of the present invention is formed in a pressing manner, but is not limited thereto, and various modifications are possible, such as generating power from a separate motor or the like and transmitting the power to the needle assembly (100).

Referring to FIGS. 3 to 5, 13, and 14, a reservoir unit (200) according to one embodiment of the present invention is mounted on the first body (13) and the third body (15), and can be connected to the needle assembly (100). The reservoir unit (200) is fluidically connected to the needle assembly (100), and a drug solution (D) can be stored in the internal space.

Referring to FIG. 3, FIG. 13, and FIG. 14, a reservoir unit (200) according to one embodiment of the present invention may include a reservoir body (210), a cap cover (220), a plunger (230), and a connector member (250). The reservoir body (210) is formed with a hollow interior, and a liquid (D) may be stored therein.

The reservoir body (210) can be connected to a needle assembly (100), specifically a needle (N) and/or a cannula, and allows the drug solution (D) to flow through the needle (N) and/or the cannula.

The reservoir body (210) can be formed to be extended to a preset length in the longitudinal direction and can store a liquid (D) in the internal space. A plunger (230) can be movably arranged inside the reservoir body (210), and the liquid (D) can be discharged through the needle (N) by the movement of the plunger (230).

Referring to FIG. 13, a cap cover (220) may be mounted on an end portion (the right end based on FIG. 13) of the reservoir body (210). The cap cover (220) covers the reservoir body (210), and a load portion (410) and/or a connecting member (430) to be described later may move through an opening (not shown in the drawing) formed in the cap cover (220).

A reservoir body (210) according to one embodiment of the present invention may have an inlet end and an outlet end. A drug solution (D) is injected into the inlet end, a needle (N) is installed at the outlet end, and the drug solution (D) can be discharged through the needle (N).

The plunger (230) is placed inside the reservoir body (210) and can move linearly (left and right as shown in FIG. 13) by driving the drive module (300) and the drive unit (400). As the plunger (230) advances, the liquid (D) can be discharged from the internal space to the needle (N).

The outer surface shape of the plunger (230) can be formed to be identical to the inner surface shape of the opposing reservoir body (210). As a result, the plunger (230) can be in close contact with the inner surface of the reservoir body (210).

The plunger (230) may be connected to a connector member (250) extending rearwardly. Referring to FIG. 5, the connector member (250) is formed to extend in the longitudinal direction, is connected to the plunger (230), and one side may be positioned inside the reservoir body (210) and the other side may be positioned outside the reservoir body (210).

The connector member (250) is connected to the plunger (230) and can move linearly along with the linear movement of the plunger (230).

The connector member (250) is made of an electrically conductive material and may have a shaft shape. As the connector member (250) moves, it can come into contact with the reservoir sensor unit (910) to be described later.

Referring to FIG. 5, by moving the connector member and coming into contact with the reservoir sensor unit (910), the amount of drug stored can be measured or the operation of the drug injection device (1) can be started. Referring to FIG. 5, the connector member (250) is illustrated as having a shaft shape, but is not limited thereto, and various modifications can be implemented within the technical concept of moving together with the plunger (230) and coming into contact with the reservoir sensor unit to generate an electrical signal.

When the liquid (D) is stored in the reservoir body (210), and the plunger (230) is retracted, the connector member (250) can be retracted together with the plunger (230). In addition, when the plunger (230) is advanced so that the liquid (D) is discharged from the reservoir to the needle (N), the connector member (250) can be advanced together with the plunger (230).

Referring to FIG. 13, the plunger (230) according to one embodiment of the present invention may be provided with a sealing ring (drawing symbol not set) at a portion that comes into contact with the inner wall of the reservoir body (210). This can prevent the liquid (D) from leaking when the plunger (230) moves inside the reservoir body (210).

Referring to FIGS. 3 to 5, a driving module (300) according to one embodiment of the present invention can generate a driving force and transmit the driving force to a driving unit (400). The driving force transmitted to the driving unit (400) can cause a plunger (230) to move linearly inside a reservoir body (210), and as the plunger (230) moves linearly, the liquid (D) can be discharged to the outside of the reservoir unit (200).

Referring to FIG. 5, a drive module (300) according to one embodiment of the present invention may include a drive source unit (310) and a power transmission unit (330). The drive source unit (310) generates power, and the power transmission unit (330) is arranged between the drive source unit (310) and the drive unit (400), specifically, the drive wheel unit (420), and transmits power generated in the drive source unit (310) to the power transmission unit (330).

Referring to FIG. 5, power generated from the driving source (310) can be transmitted to the driving unit (400), specifically, the driving wheel unit (420), through the power transmission unit (330). The power transmission unit (330) according to one embodiment of the present invention can transmit power to the driving wheel unit (420) to rotate the driving wheel unit (420).

According to one embodiment of the present invention, the load part (410) moves linearly by the rotation of the driving wheel part (420), so that the plunger (230) can move linearly inside the reservoir body (210). As the plunger (230) moves linearly, the connector member (250) connected to the plunger (230) can also move linearly.

The driving module (300) may be any type of device that has a liquid (D) suction power and a liquid (D) discharge power by electricity. In the present invention, the driving module (300) may be a motor that converts electric energy into mechanical energy. The rotational power generated in the driving module (300), specifically, the driving source unit (310), may be transmitted to the driving wheel unit (420) through the power transmission unit (330).

The power transmission unit (330) and the driving wheel unit (420) can come into contact with each other in a gear manner, and the driving wheel unit (420) can rotate and move the plunger (230) due to the power generated from the driving source unit (310).

In the present invention, the driving module (300) is formed in an electric motor manner, but is not limited thereto, and all types of pumps, such as a mechanical displacement type micropump and an electromagnetic motion type micropump, can be used.

Mechanical displacement micropumps are pumps that use the movement of solids or fluids, such as gears or diaphragms, to create a pressure difference to induce the flow of fluid, and include diaphragm displacement pumps, fluid displacement pumps, and rotary pumps.

Electro-magnetic micropumps are pumps that use electrical or magnetic energy to move fluids, and include electro-hydrodynamic pumps (EHD), electro-osmotic pumps, magneto-hydrodynamic pumps, and electro-wetting pumps.

Referring to FIGS. 3 to 5, a battery (350) according to one embodiment of the present invention can supply electricity to a liquid injection device (1) to activate each component.

The drawing shows a pair of batteries (350), but is not limited thereto, and may be set in various ways depending on the capacity, usage range, usage time, etc. of the liquid injection device (1).

A battery (350) according to one embodiment of the present invention may be placed adjacent to the driving module (300) and the driving unit (400), and may supply electricity to the driving module (300).

In addition, the battery (350) is connected to the control module (17), and can measure data on the number of rotations or rotation speed of the drive unit (400), the amount of the drug (D) stored in the reservoir unit (200), specifically the reservoir body (210), and the amount of the drug (D) injected to the user, based on the electrical signal measured by the sensor unit (900).

Referring to FIGS. 3 to 6 and 8 to 14, a driving unit (400) according to one embodiment of the present invention can receive power from the outside and move a plunger (230) linearly.

A driving unit (400) according to one embodiment of the present invention is installed between a driving module (300) and a reservoir unit (200), and can move a plunger (230) disposed inside a reservoir body (210) with a driving force generated by the driving module (300).

Referring to FIGS. 12 to 14, a drive unit (400) according to one embodiment of the present invention may include a load portion (410), a drive wheel portion (420), a connecting member (430), and a force member (440).

Referring to FIGS. 12 to 14, the load portion (410) is connected to the plunger (230) and can extend in one direction. The load portion (410) is inserted into the opening of the cap cover (220), and the load portion (410) can move along the longitudinal direction (left-right direction based on FIG. 13) inside the reservoir body (210) to move the plunger (230).

The load portion (410) according to one embodiment of the present invention may have a screw thread shape on its surface. A screw groove is formed on the inner surface of the connecting member (430) facing the surface of the load portion (410), and the load portion (410) and the connecting member (430) may be connected in a screw manner.

Referring to FIGS. 10 to 12, a load section (410) according to one embodiment of the present invention may have a flat section (431) formed in a plane shape along a predetermined section of the longitudinal central axis.

When the drug (D) is injected into the interior of the reservoir body (210) due to the flat portion (431) formed along the circumference of the load portion (410), the drug (D) can be inserted into the interior of the drive wheel portion (420) described later and moved, and when the drug (D) is injected into the user's body, the drive wheel portion (420) can receive power from the drive module (300) and rotate together with the rotation.

That is, there is no need for a separate clutch unit to link the driving wheel unit (420) and the load unit (410), which has the effect of simplifying the structure of the liquid injection device (1).

Referring to FIGS. 12 to 14, a force member (440) according to one embodiment of the present invention can be in contact with a connecting member (430) and apply force in the opposite direction to the direction in which the connecting member (430) moves.

Specifically, the loading member (440) comes into contact with the outer surface of the connecting member (430) to generate friction and can restrict linear movement of the connecting member (430).

According to one embodiment of the present invention, the force member (440) is formed in a ring shape that is in close contact with the outer periphery of the connecting member (430), but is not limited thereto, and may be formed as an elastic body in the form of a clip to apply pressure to the outer side of the connecting member (430).

The force member (440) is fixed in position with respect to the linear movement direction of the connecting member (430), and can generate frictional force according to the movement of the connecting member (430).

As an optional embodiment, the force member (440) may be formed of an elastic body such as a spring and has the effect of applying force to the connection member (430) in the opposite direction to the direction in which the connection member (430) moves.

Referring to FIG. 13 and FIG. 14, the loading member (440) placed in contact with the outer surface of the connecting member (430) does not generate frictional force when no external force is applied to the connecting member (430).

In contrast, when an external force is applied to the connecting member (430), the loading member (440) can generate a frictional force opposing the external force applied to the connecting member (430) in response. As a result, the movement of the connecting member (430) can be restricted by the force of the loading member (440).

Referring to FIG. 13 and FIG. 14, in the state of FIG. 13, before the injection of the drug (D) into the reservoir body (210) is completed, the plunger (230) can move backward (from the left to the right based on FIG. 13).

During the process of injecting the drug (D), an impact may be applied to the drug injection device (1), and when such an external factor is applied, the plunger (230) may move backwards, causing gas to flow into the interior of the reservoir body (210).

According to one embodiment of the present invention, the force member (440) has the effect of preventing gas from flowing in before the injection of the drug (D) into the reservoir is completed by limiting the connection member (430) from moving more than necessary.

After the injection of the drug solution (D) is completed, the power generated from the drive module (300), specifically the drive source unit (310), is transmitted to the drive wheel unit (420) through the power transmission unit (330), and the drive wheel unit (420) can rotate.

When the driving wheel part (420) rotates, the connecting member (430) connected to the load part (410) is inserted into the inside of the driving wheel part (420) due to the movement of the plunger (230) and the load part (410) according to the injection of the liquid (D).

Referring to Fig. 12, due to the flat portion (431) formed to extend along the longitudinal direction of the connecting member (430), the connecting member (430) also rotates in conjunction with the rotation of the driving wheel portion (420), and the load portion (410) connected to the connecting member (430) in a screw manner rotates to move the plunger (230) in the opposite direction to the direction of movement when injecting the drug (D), thereby discharging the drug (D) toward the needle (N).

Referring to FIGS. 5, 6, 8 to 14, a driving wheel unit (420) according to one embodiment of the present invention is connected to a driving module (300) so as to be in contact with it, and can rotate by driving the driving module (300). The driving wheel unit (420) shares a longitudinal central axis with the load unit (410) and the connecting member (430) and can be formed to extend in the longitudinal direction.

Referring to FIGS. 12 to 14, the driving wheel part (420) according to one embodiment of the present invention may be formed with a hollow interior so that a connecting member (430) can be inserted. The inner surface of the internal space formed along the longitudinal central axis of the driving wheel part (420) may correspond to the shape of the outer surface of the connecting member (430).

According to one embodiment of the present invention, the inner surface of the driving wheel part (420) can make surface contact with a flat part (431) formed in the connecting member (430) at a predetermined section along the inner surface perimeter.

As a result, when the injection of the liquid (D) is completed and the connecting member (430) is inserted into the inside of the driving wheel part (420), the power generated from the driving module (300) is transmitted to the driving wheel part (420), so that the connecting member (430) can also rotate together with the driving wheel part (420).

In addition, as the connecting member (430) rotates together with the driving wheel member (420), the rod member (410) connected to the connecting member (430) in a screw manner rotates, allowing the plunger (230) to move linearly within the reservoir body (210).

Referring to FIGS. 8 to 14, a driving wheel unit (420) according to one embodiment of the present invention may be provided with wing members (421) and connecting members (425) along the longitudinal direction (left-right direction based on FIG. 13). The wing members (421) and connecting members (425) may be formed in the shape of gear teeth along the circumferential direction based on the longitudinal central axis and the rotational central axis of the driving wheel unit (420).

The wing member (421) and the connecting member (425) formed in the driving wheel unit (420) can be arranged at a predetermined interval. The wing member (421) can be in contact with the driving module (300), specifically, the power transmission unit (330), and as the power transmission unit (330) that receives power from the driving source unit (310) rotates, the wing member (421) also rotates, thereby enabling the driving wheel unit (420) to rotate.

Power generated from the drive module (300), specifically the drive source (310), is transmitted to the power transmission unit (330), and the power transmission unit (330) can then transmit power to the wing (421) formed in the drive unit (400), specifically the drive wheel unit (420).

Referring to FIGS. 5, 6, 8 to 14, a connecting member (425) according to one embodiment of the present invention is formed along the longitudinal central axis of the driving wheel member (420) and can be spaced apart from the wing member (421) by a predetermined interval.

According to one embodiment of the present invention, the connecting member (425) may be formed in a gear tooth shape along the circumferential direction based on the longitudinal central axis and the rotational central axis of the driving wheel member (420), similar to the wing member (421).

A plurality of connecting ends (425) according to one embodiment of the present invention may be provided and may be arranged along the longitudinal central axis of the driving unit (400).

Referring to FIGS. 8 to 12, the connecting end (425) may include a first connecting end (425A) and a second connecting end (425B), and the first connecting end (425A) and the second connecting end (425B) may be arranged along the longitudinal central axis of the driving unit (400), specifically, the driving wheel unit (420).

The first connecting section (425A) and the second connecting section (425B) can be arranged so that their facing surfaces are in contact with each other. However, this is not limited to this, and various modifications, such as forming them as one piece, are possible.

A plurality of connecting ends (425), specifically, a first connecting end (425A) and a second connecting end (425B), are each provided with a plurality of gear protrusions (426) along a circumferential direction based on the longitudinal central axis of the driving unit (400), and a gear groove (427) may be formed between each of the plurality of gear protrusions (426).

Referring to FIGS. 8 to 11, 13, and 14, the gear protrusions (426) formed on each of the first connecting end (425A) and the second connecting end (425B), which are a plurality of connecting ends (425), may not overlap in the direction of the longitudinal central axis of the driving unit (400), specifically, the driving wheel unit (420).

In other words, referring to FIG. 10, when viewed in cross-section with a plane perpendicular to the longitudinal central axis of the driving wheel portion (420), the gear projection (426) formed on the second connection end (425B) can be arranged on the same line as the gear groove portion (427) formed between the gear projection portions (426) formed on the first connection end (425A).

Since the gear projections (426) formed on the first connecting section (425A) and the second connecting section (425B) respectively do not overlap in the longitudinal direction of the driving wheel section (420), compared to a case where a single connecting section (425) is provided for one rotation of the driving wheel section (420), multiple connecting sections (425) come into contact with and sense the driving sensing section (920) to be described later, thereby enabling the effect of sensing relatively precisely whether the driving module (300) has operated once.

In addition, since the rotation of the plurality of connecting ends (425), specifically the first connecting end (425A) and the second connecting end (425B), means the rotation of the driving wheel unit (420), the driving sensing unit (920) can sense whether power is properly transmitted from the driving module (300) to the driving unit (400) by alternately contacting the first connecting end (425A) and the second connecting end (425B).

In addition, there is an effect in which the driving sensing unit (920) can measure the rotation angle of the driving wheel unit (420) by alternately contacting and sensing a plurality of connecting terminals (425), specifically, the first connecting terminal (425A) and the second connecting terminal (425B).

Referring to FIG. 2, an injection cover (700) according to one embodiment of the present invention can be connected to a reservoir unit (200), specifically, a reservoir body (210). The injection cover (700) can be inserted into and connected to an inlet (drawing symbol not set) formed in the reservoir body (210).

Referring to FIG. 3, an alarm unit (800) according to one embodiment of the present invention is placed inside or outside a drug injection device (1) and can notify a user of normal operation or malfunction of the drug injection device (1).

An alarm unit (800) according to one embodiment of the present invention is placed under the housing (11) and connected to the circuit board. The alarm unit (800) can generate a warning sound or generate light to transmit an alarm to an external user.

Referring to FIGS. 4, 5 to 11 and 13 and 14, a sensor unit (900) according to one embodiment of the present invention measures the operation of a drug injection device (1) and may include a reservoir sensor unit (910), a drive sensing unit (920), and an encoder unit (930).

The sensor units (900) according to one embodiment of the present invention can measure the storage amount of the liquid (D) in the reservoir, or measure whether the drive module (300) is driven, whether the drive unit (400) is driven, the rotation angle of the drive wheel part (420), the movement distance of the plunger (230), etc.

Referring to FIGS. 4 and 5, a reservoir sensor unit (910) according to one embodiment of the present invention measures the storage amount of a drug solution (D) stored in a reservoir unit (200), and may include a first connector contact terminal (911) and a second connector contact terminal (912).

The first connector contact terminal (911) and the second connector contact terminal (912) can measure data by measuring whether there is electrical contact with the connector member (250), and specifically, the storage amount of the liquid (D) can be measured.

The position of one end of the first connector contact end (911) and the second connector contact end (912) can be changed by contact with the connector member (250), and when the contact with the connector member (250) is released, the position can be returned to the original position by a restoring force.

According to one embodiment of the present invention, the first connector contact end (911) and the second connector contact end (912) may have elasticity, and specifically, may have an elastic spring shape. The first connector contact end (911) and the second connector contact end (912) may be connected to a control module (17), which is a circuit board.

Referring to FIGS. 4 and 5, the reservoir sensor unit (910) may be positioned adjacent to the reservoir unit (200). The reservoir sensor unit (910) may be positioned on the movement path of the connector member (250).

The first connector contact end (911) and the second connector contact end (912) can be mounted in the fixed groove (drawing symbol not set) of the second body (14). When the connector member (250) connected to the reservoir unit (200), specifically the plunger (230), moves, it can come into contact with at least one of the plurality of first connector contact ends (911) and second connector contact ends (912).

The first connector contact end (911) and the second connector contact end (912) are arranged spaced apart from each other, and the connector member (250) can move linearly to come into contact with the first connector contact end (911) and/or the second connector contact end (912).

Referring to FIGS. 4 and 5, in the process of injecting the liquid (D) into the reservoir body (210), the connector member (250) first comes into contact with the first connector contact end (911), and then the connector member (250) can come into contact with the second connector contact end (912).

A connector member (250) according to one embodiment of the present invention can electrically connect a first connector contact end (911) and a second connector contact end (912). When the first connector contact end (911) and the second connector contact end (912) are electrically connected through the connector member (250), the control module (17) can recognize a specific event of the reservoir unit (200).

For example, when the connector member (250) comes into contact with the first connector contact end (911) and the second connector contact end (912), the reservoir sensor unit (910) can sense that the drug solution (D) stored in the reservoir body (210) is stored at a first reference amount (e.g., 10%, 20%, 30%, etc.).

When it is recognized that the drug (D) is stored in the reservoir body (210) as the set first reference amount, the control module (17) can wake up the drug injection device (1) (awake function). That is, the control module (17) can check that a certain amount of drug (D) is stored in the reservoir body (210) and start some operation to preheat the drug injection device (1).

As an optional embodiment, the control module (17) can transmit an alarm signal to the user depending on whether there is contact between the connector member (250) and the first connector contact end (911) and the second connector contact end (912), and in some cases, the control module (17) can forcibly terminate the drug injection device (1), continuously generate an alarm signal to the user terminal (20), reduce the amount of drug (D) injected to the user, or increase the injection cycle.

Referring to FIGS. 4 to 6 and 7 to 11, a driving sensing unit (920) according to one embodiment of the present invention can be in contact with a connecting end (425) formed in a driving wheel unit (420), and can detect the driving of the driving unit (400) by reciprocating in a preset direction as the driving unit (400) is driven.

Referring to FIGS. 4 to 6 and 7 to 11, a driving sensing unit (920) according to one embodiment of the present invention may include a sensing moving unit (921), a driving sensing main body unit (925), a contact end (926), and a support member (929).

Referring to FIGS. 10 and 11, a sensing moving part (921) according to one embodiment of the present invention can be in contact with a connecting part (425) and can move by receiving power from a driving unit (400). Specifically, the sensing moving part (921) can be in contact with a connecting part (425) formed on a driving wheel part (420) when the connecting part (425) rotates along the rotational center axis of the driving unit (400) and can reciprocate along a preset direction (left and right direction based on FIG. 10).

Referring to FIGS. 6, 8, and 10, the sensing moving unit (921) may include a sensing moving body (922). The sensing moving body (922) may be positioned movably on the second body (14). One side (left side as shown in FIG. 10) of the sensing moving body (922) may be in contact with a connecting end (425) formed on a driving wheel unit (420), and the other side (right side as shown in FIG. 10) opposite thereto may be connected to a supporting member (929).

The support member (929) has elastic restoring force and is fixed in position to the base body, specifically the second body (14), and can be arranged between the sensing moving part (921) and the second body (14). Since the support member (929) has elastic restoring force, the sensing moving part (921), specifically the sensing moving main body (922), can reciprocate in a direction toward or away from the connecting end (425).

Referring to FIGS. 10 and 11, one side of the sensing moving body (922) facing the connecting end (425) can be formed with an inclined surface (923), and the inclined surface (923) formed at an inclined surface at a predetermined angle with respect to the longitudinal central axis of the sensing moving body (922) has the effect of allowing the rotational motion of the connecting end (425) formed in the driving wheel unit (420) to be easily transferred to the linear reciprocating motion of the sensing moving body (922).

Referring to FIGS. 10 and 11, a plurality of connecting ends (425) formed in a driving wheel unit (420) according to one embodiment of the present invention are provided, and specifically, a first connecting end (425A) and a second connecting end (425B) can alternately come into contact with a sensing moving unit (921) and transmit power to the sensing moving unit (921).

Referring to FIGS. 5, 6, 8, and 10, a catch member (924) may be formed to protrude from a sensing moving part (921) according to one embodiment of the present invention, specifically, a sensing moving body (922). The catch member (924) may be formed to protrude in a direction (upper and lower direction based on FIG. 10) orthogonal to the longitudinal central axis and the reciprocating central axis of the sensing moving body (922).

Referring to FIGS. 6, 8, and 10, a catch member (924) formed to protrude on a sensing moving body (922) can pass through a connecting hole (925H1) formed on a driving sensing body part (925) to be described later.

Referring to FIGS. 8 and 9, since the engaging member (924) penetrates and is connected to the connecting hole (925H1) formed in the driving sensing main body (925), when the sensing moving body (922) performs linear reciprocating motion, the driving sensing main body (925) can rotate clockwise or counterclockwise with the passing member (14P) formed in the second body (14) as the rotational center axis.

Specifically, the pass-through member (14P) formed in the second body (14) can pass through the rotation hole (925H2) formed in the driving sensing main body (925) and act as a rotational center axis. When the driving sensing main body (925) rotates around the longitudinal center axis of the pass-through member (14P) formed in the second body (14) as the rotational center axis, it can contact the contact end (926), and by being electrically connected to the contact end (926), it can sense the driving of the driving unit (400), specifically, the driving wheel part (420) related to the rotational angle, rotational number, etc.

Referring to FIG. 9, a driving sensing body (925) according to one embodiment of the present invention may have a bending section (925C) formed that bends at a predetermined section to vary the height.

Due to the bending portion (925C), the heights of the area where the connection hole (925H1) and the rotation hole (925H2) are formed in the driving sensing body and the area that contacts the contact end (926), specifically the first contact end (927), can be formed differently, thereby improving rotational stability on the second body (14).

Referring to FIGS. 5, 6, and 8, a contact terminal (926) according to one embodiment of the present invention is capable of making contact with the driving sensing main body (925) and being electrically connected. A plurality of contact terminals (926) are provided, and may include a first contact terminal (927) and a second contact terminal (928).

The first contact terminal (927) and the second contact terminal (928) are spaced apart from each other and can be placed on a circuit board provided in the control module (17).

The first contact section (927) is arranged between the driving sensing main body (925) and the circuit board and can maintain a contact state. The driving sensing main body (925) can be formed of a conductive material, and when the driving sensing main body (925) rotates around the passing member (14P) formed in the second body (14) as the rotational center axis, the driving sensing section (920) can generate an electrical signal as it comes into contact with or is separated from the second contact section (928).

The above electrical signal can be transmitted to the control module (17) and can sense whether the driving unit (400) is driven. That is, it is possible to measure whether the power generated from the driving module (300) is properly transmitted to the driving unit (400) and the rotational speed and rotational angle of the driving wheel unit (420).

When the rotation angle of the driving wheel unit (420) is measured in the driving sensing unit (920), the distance that the plunger (230) has moved linearly can be calculated, and the amount of the drug (D) discharged from the reservoir body (210) and the amount of the drug (D) remaining in the reservoir body (210) can be measured through the movement distance.

Referring to FIGS. 4, 5, 8, and 9, an encoder unit (930) according to one embodiment of the present invention is arranged at one end of a driving unit (400) and can measure the rotation of the driving unit (400). Specifically, the encoder unit (930) can measure the rotation of the driving wheel unit (420).

The encoder unit (930) may include a first encoder contact terminal (931), a second encoder contact terminal (932), and an encoder cover (933). The second encoder contact terminal (932) may be arranged at an end of the encoder cover (933) so as to always maintain contact with the encoder cover (933). The first encoder contact terminal (931) may come into contact with or be released from the encoder cover (933) as the driving wheel unit (420) rotates.

Referring to FIG. 8, the first encoder contact terminal (931) and the second encoder contact terminal (932) are arranged on opposite sides, but this is not limited to this, and various modifications are possible within the technical concept in which one of the first encoder contact terminal (931) and the second encoder contact terminal (932) maintains contact with the encoder cover (933) and the other can selectively come into contact with the encoder cover (933).

The encoder cover (933) can be inserted into one end of the driving wheel part (420). The encoder cover (933) can include a cover end (drawing symbol not set) and a tooth end (drawing symbol not set).

The cover section is formed to extend around the outer surface of the driving wheel section (420), but the teeth section may extend from the cover section and be arranged in multiple pieces spaced apart along the outer surface of the driving wheel section (420). The teeth section may extend from the cover section along the longitudinal direction of the driving wheel section (420).

The encoder unit (930) can sense the rotation of the driving wheel unit (420) to measure whether the driving sensing unit (920) is being driven properly. When the liquid injection device (1) is operating normally, if the rotation of the driving wheel unit (420) is measured by the encoder unit (930), the contact end (926) and the driving sensing main body (925) of the driving sensing unit (920) must also be in electrical contact.

If the encoder unit (930) measures that the driving wheel unit (420) is not rotating, contact between the driving sensing body and the contact end (926) in the driving sensing unit (920) must not occur.

Therefore, by comparing the signal measured by the encoder unit (930) with the signal measured by the drive sensing unit (920), the encoder unit (930) can check for errors in the drive sensing unit (920).

An encoder unit (930) according to one embodiment of the present invention can measure the rotation angle and rotation speed of a driving wheel unit (420) and accurately measure the driving of a driving unit (400) by measuring whether a first encoder contact terminal (931) and a second encoder contact terminal (932) are electrically connected and disconnected and the number of times electrically connected.

The operating principle and effect of the drug injection device (1) according to one embodiment of the present invention as described above are explained.

Referring to FIGS. 2, 3, 13, and 14, the injection process of storing the drug (D) in the reservoir body (210) before attaching the drug injection device (1) to the user and then discharging the drug (D) from the reservoir body (210) with a needle (N) to use the drug (D) is described as follows.

<Drug storage steps>

The user injects the drug (D) into the reservoir unit (200) of the drug injection device (1) using an external drug (D) injector (not shown). As shown in Fig. 13, before injecting the drug (D), a plunger (230) is placed at the front end of the reservoir body (210), and a load part (410) is assembled to a connecting member (430) at the rear end of the plunger (230).

The user puts the drug (D) to be injected into the drug (D) injector (not shown) and inserts the drug (D) injector into the inlet of the reservoir unit (200). At this time, the air remaining inside the reservoir body (210) can be primed.

In detail, during the assembly process of the reservoir unit (200), air remains between the reservoir body (210) and the plunger (230). If the liquid (D) is injected while air remains in the reservoir body (210), there is a risk that air will also be injected to the user, so an operation to remove the air (priming operation) is required.

When the liquid (D) starts to flow into the reservoir body (210) from the liquid (D) injector, the remaining gas is pushed out by the needle (N) while flowing between the inner surface of the reservoir body (210) and the plunger (230). At this time, the gas can move along the guide groove (drawing symbol not set).

That is, the gas remaining inside the reservoir body (210) can be discharged to the needle (N) along the guidance of the guide groove by the flowing liquid (D). By the guidance of the guide groove, the gas remaining inside the reservoir body (210) can be quickly discharged to the outside, thereby removing the gas in the reservoir body (210).

The reservoir sensor unit (910) can be driven depending on the amount of the drug (D) injected into the reservoir body (210). As the drug (D) is injected into the reservoir body (210), the connector member (250) connected to the plunger (230) moves together along the central axis of the movement direction of the plunger (230) and the load member (410) connected to the plunger (230), and as the connector member (250) moves, it can sequentially contact the first connector contact end (911) and the second connector contact end (912).

When the connector member (250) is in contact with the first connector contact end (911) and the second connector contact end (912), the first contact end (927) and the second contact end (928) are electrically connected, and the first mode can be driven. The first mode is an AWAKE mode for waking up the drug injection device (1), and the drug injection device (1) can be preheated in advance so that it can be driven immediately when the drug injection device (1) is attached to the user.

In addition, the user can be notified in advance through a user terminal (20) or the like that a preset first standard amount of the drug (D) is stored in the reservoir body (210), thereby notifying the user in advance to use the drug injection device (1).

In another embodiment, when the connector member (250) is connected to the first connector contact end (911), the control module (17) can recognize it as a first event, and when it is connected to the second connector contact end (912), the control module (17) can recognize it as a second event. That is, when the connector member (250) is in contact with each different contact end (926), different events can be recognized and the events can be transmitted to the user.

<Attachment Step>

As shown in Fig. 14, when the priming operation in which the gas in the reservoir body (210) is removed in the aforementioned drug storage step is completed and the drug is stored in the reservoir body (210), the drug injection device (1) can be attached to the user.

A user can attach a drug injection device (1) to the user and drive a needle drive unit (600) to insert a needle (N) and a cannula into the user's skin. The needle (N) is inserted into the skin together with the cannula, and can induce the cannula to be inserted into the skin.

Afterwards, the needle (N) is withdrawn from the skin, but remains connected to the cannula. Specifically, when the user further drives the needle drive unit (600), the needle (N) moves upward while the cannula is inserted into the skin.

Specifically, the needle driving unit (600) according to one embodiment of the present invention can be formed in a pressing manner, and when the user presses the needle driving unit (600) once more, the needle (N) can move upward while the cannula is inserted into the skin.

The cannula and needle (N) are at least partially connected and can form and maintain a path through which the drug liquid (D) flows.

<Drug injection stage>

The drive module (300) and the drive unit (400) can be driven substantially simultaneously with the operation of inserting the cannula and needle (N) into the user. The drug injection device (1) can inject the drug (D) into the user according to a preset cycle and injection amount.

When the needle assembly (100) receives power from the needle drive unit (600) to insert the needle (N) and the cannula into the skin, the drive module (300) can be driven.

Referring to FIGS. 4 and 5, a drive module (300) according to one embodiment of the present invention transmits power to a drive unit (400). Specifically, when power is generated in a drive source unit (310), the power can be transmitted to the drive unit (400) through a power transmission unit (330).

The drive unit (400), specifically the drive wheel unit (420), can receive power from the power transmission unit (330) and rotate around the longitudinal central axis as the rotation axis.

Referring to Fig. 14, when the injection of the drug (D) is completed and the drug (D) is injected into the user, the connecting member (430) is inserted into the interior of the driving wheel part (420), and due to the flat part (431) formed on the outer surface of the connecting member (430), the connecting member (430) can rotate in conjunction with the rotation of the driving wheel part (420) without a separate clutch unit.

In addition, the rod part (410) connected to the connecting member (430) in a screw-joint manner rotates along the longitudinal central axis as the connecting member (430) rotates, and has the effect of moving together with the plunger (230) toward the front of the reservoir body (210).

The load unit (410) and plunger (230) can move forward together to discharge the drug (D) through the needle (N). As a result, the drug can be stably injected into the user according to the preset driving cycle and driving speed of the driving module (300).

At this time, the driving sensing unit (920) can come into contact with the connecting end (425) formed in the driving wheel unit (420), and can detect the driving of the driving unit (400) by moving back and forth in a preset direction as the driving unit (400) is driven.

Referring to FIGS. 5, 6, 8 to 12, a plurality of connecting ends (425) are provided, and the first connecting end (425A) and the second connecting end (425B) can be arranged so that the respective gear protrusions (426) do not overlap in the direction of the longitudinal central axis of the driving wheel part (420).

As the driving unit (400), specifically the driving wheel part (420), rotates, the connecting part (425), specifically the first connecting part (425A) and the second connecting part (425B) rotate. At this time, the driving sensing part (920), specifically the sensing moving part (921) can be moved by alternately contacting the driving sensing part (920).

Referring to FIG. 9 and FIG. 11, as the driving wheel unit (420) rotates, the first connecting end (425A) and the second connecting end (425B) alternately come into contact with the sensing moving unit (921), specifically, the sensing moving main body (922), and one side of the sensing moving main body (922) facing the connecting end (425) is formed to be inclined downward toward the connecting end (425) formed in the driving wheel unit (420), thereby allowing power to be stably transmitted after coming into contact with the connecting end (425).

Referring to FIG. 9 and FIG. 11, as the driving wheel part (420) rotates, the sensing moving part (921), specifically the sensing moving body (922), moves linearly in a preset direction (left and right direction based on FIG. 11).

Referring to FIG. 9, a catch member (924) may be formed to protrude at a predetermined angle, specifically, in a direction perpendicular to the movement direction center axis of the sensing moving body (922), and the catch member (924) may penetrate a connecting hole (925H1) formed in the driving sensing body portion (925).

Referring to FIG. 6 and FIG. 9, in addition to the connecting hole (925H1), the driving sensing body has a rotation hole (925H2) formed in the shape of a hole. Since the passage member (14P) formed in the second body (14) passes through the rotation hole (925H2), the driving sensing body can rotate clockwise or counterclockwise with the passage member (14P) as the rotation center.

In other words, the rotational motion of the driving unit (400) is converted into the linear motion of the sensing moving part (921), and when the sensing moving part (921) performs a linear reciprocating motion, the driving sensing main body part (925) connected to the sensing moving part (921) can rotate clockwise or counterclockwise with the passing member (14P) as the center of rotation.

Referring to FIGS. 10 and 11, one end of the sensing moving body (922) opposite to the other end where the inclined surface (923) is formed can come into contact with the support member (929). The support member (929) has elastic restoring force and is positioned between the sensing moving body (922) and the second body (14), and as the sensing moving body (922) is elastically supported, the sensing moving body (922) can perform a linear reciprocating motion as the plurality of connecting ends (425) formed in the driving wheel unit (420) rotate.

Referring to FIG. 6, FIG. 8, and FIG. 9, the driving sensing main body (925) can make contact with the contact terminal (926), and the contact terminal (926) can include a first contact terminal (927) and a second contact terminal (928). The first contact terminal (927) and the second contact terminal (928) are both fixedly positioned on the second body (14), and can form an electrical path.

The first contact end (927) maintains a state of being in contact with the driving sensing main body (925), and the second contact end (928) is spaced apart from the first contact end (927) and can be brought into and out of contact by the rotational movement of the driving sensing main body (925).

When the second contact terminal (928) comes into contact with the driving sensing main body (925), the first contact terminal (927) and the second contact terminal (928) can be electrically connected because the driving sensing main body (925) has electrical conductivity, and the electrical signal generated at this time can be transmitted to the control module (17) through the circuit board.

In other words, the connecting end (425) formed in the driving wheel part (420) includes a first connecting end (425A) and a second connecting end (425B), and the gear protrusions (426) formed in each of the first connecting end (425A) and the second connecting end (425B) alternately come into contact with the sensing moving body (922), and as the sensing moving body (922) moves linearly, the driving sensing body part (925) connected to the sensing moving body (922) rotates, and it is possible to sense whether the first contact end (927) and the second contact end (928) are electrically connected or disconnected according to the driving sensing body part (925).

The drive sensing unit (920) according to one embodiment of the present invention has the effect of accurately sensing the angle at which the connecting end (425) formed in the drive wheel unit (420) must rotate once after power is applied to the drive module (300) based on data measuring the rotation of the drive sensing main body unit (925).

That is, it is possible to check whether the drive module (300) of the liquid injection device (1) operates once, and to measure whether power is properly transmitted from the drive module (300) to the drive unit (400).

In addition, there is an effect of being able to measure the rotation angle and/or rotation speed of the driving wheel part (420), or measure the movement distance of the plunger (230) and the injection amount of the liquid (D) by the rotation of the driving wheel part (420).

Referring to FIGS. 5, 8, and 9, when the driving wheel unit (420) according to one embodiment of the present invention rotates, the encoder unit (930) can measure the rotation angle, rotation speed, etc. of the driving wheel unit (420). The second encoder contact terminal (932) maintains electrical contact with the encoder cover (933), but the first encoder contact terminal (931) can maintain or release electrical contact with the encoder cover (933).

Specifically, a predetermined area of the encoder cover (933) facing the first encoder contact section (931) may be formed with a cover section (drawing symbol not set) and a tooth section (drawing symbol not set) along the circumferential direction based on the longitudinal central axis of the driving wheel section (420).

The cover section is formed to extend around the outer surface of the driving wheel section (420), but a plurality of teeth sections that can come into contact with the first encoder contact section (931) may be extended from the cover section and arranged to be spaced apart from each other along the outer surface of the driving wheel section (420). The teeth sections may extend from the cover section along the longitudinal direction of the driving wheel section (420).

The encoder unit (930) can measure data related to the rotation of the driving wheel unit (420) by measuring an electrical connection signal and/or an electrical release signal. The control module (17) can calculate the rotation angle and rotation speed of the driving wheel unit (420) based on the data measured by the encoder unit (930), and can calculate the movement distance of the plunger (230) and the discharge amount of the liquid (D) based on the data.

A drug injection device (1) according to one embodiment of the present invention can check whether the device is operating normally and measure the injection amount of drug (D) stored in the reservoir body (210).

In addition, since the drive sensing unit (920) is arranged to be in contact with a plurality of connecting ends (425) formed in the drive wheel unit (420) alternately as the drive wheel unit (420) rotates, there is an effect of being able to sense the operation of the drive unit (400) that receives power from the drive module (300).

In addition, the encoder unit (930) can accurately measure data regarding the rotation of the driving wheel unit (420) to sense whether the liquid injection device (1) is operating normally.

In addition, since the encoder unit (930) can measure the rotation angle of the driving wheel unit (420) and calculate the movement distance of the plunger (230), the amount of the drug (D) injected to the user from the drug injection device (1) can be measured.

The idea of the present invention should not be limited to the embodiments described above, and not only the scope of the patent claims described below, but also all scopes equivalent to or equivalently modified from the scope of the patent claims are included in the scope of the idea of the present invention.

1: Liquid injection system N: Needle
10: Liquid injection device 11: Housing
12: Attachment 13: First body
14: 2nd body 14P: Pass-through
15: 3rd body 16: Body cover
17: Control module 20: User terminal
30: Controller 40: Biometric sensor
100: Needle assembly 200: Reservoir unit
210: Reservoir body 220: Cap cover
230: Plunger 250: Connector Absence
300: Drive module 310: Drive unit
330: Powertrain 350: Battery
400: Drive unit 410: Load section
420: Drive wheel part 421: Wing part
425: Connector 425A: First connector
425B: Second connecting section 426: Gear projection
427: Gear home part 430: Connecting member
431: Flat part 440: Loading member
600: Needle drive unit 700: Injection cover
800: Alarm unit 900: Sensor unit
910: Reservoir sensor unit 911: First connector contact
912: Second connector contact 920: Drive sensing section
921: Sensing moving part 922: Sensing moving body
923: Slope 924: Hanging member
925: Drive sensing body 925H1: Connection hole
925H2: Rotating hole 925C: Bend hole
926: Contact point 927: First contact point
928: Second contact point 929: Support member
930: Encoder unit 931: 1st encoder contact
932: 2nd encoder contact 933: Encoder cover

Claims (5)

base body;
A needle assembly mounted on the above base body;
A reservoir unit fluidly connected to the needle assembly and having a plunger therein;
A driving unit that receives power from the outside, moves the plunger linearly, and has a connecting end along the longitudinal central axis; and
It includes a driving sensing unit that can be in contact with the above connecting terminal and moves back and forth in a preset direction as the driving unit is driven and detects the driving of the driving unit;
The above driving sensing unit includes a sensing moving unit that can be in contact with the connecting end and can move by receiving power from the driving unit; a driving sensing main body that is connected to the sensing moving unit and can reciprocate; and a contact end that is arranged to be in contact with the driving sensing main body.
The above contact terminal is provided in multiple numbers,
One of the plurality of above contact terminals is maintained in contact with the driving sensing body,
A liquid injection device, wherein another one of the plurality of contact terminals is capable of contacting the driving sensing main body as the driving sensing main body moves. delete delete In the first paragraph,
The above contact end is an elastic, liquid injection device. In the first paragraph,
A liquid injection device having a plurality of the above connecting sections, arranged along the longitudinal central axis of the driving unit.

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