Liquid medicine injection device

Abstract

The present invention relates to a liquid medicine injection device. One aspect of the present invention may comprise: 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 including a rod connected to the plunger so as to move along the reservoir unit, and a driving wheel for transferring a driving force to the rod, the driving wheel having at least one fastening part formed to protrude in one direction; and a connection member disposed between the rod and the driving wheel and fastened to the driving wheel by rotation of the driving wheel.

Description

Liquid injection device

[0001] The present invention relates to a drug injection device.

[0002] Typically, medication infusion devices, such as insulin infusion pumps, are used to inject medications into a patient's body. While these devices are sometimes used by medical professionals like doctors and nurses, they are most often used by laypeople, such as patients themselves or their caregivers.

[0003] Diabetic patients, especially those with childhood diabetes, require injections of medications like insulin at regular intervals. Patch-type medication infusion devices, which are attached to the body for a set period of time, are being developed. These devices can be used as patches attached to the patient's abdomen or lower back for a set period of time.

[0004] In order to increase the effectiveness of 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.

[0005] When attached to the human body, drug injection devices must be comfortable to wear, easy to use, durable, and operate with low power consumption. In particular, since drug injection devices are directly attached to the patient's skin, it is crucial that they operate conveniently and safely for the user.

[0006] The present invention provides a drug injection device that operates safely and can accurately deliver a drug.

[0007] In order to achieve the above object, one aspect of the present invention may include a needle assembly for injecting a medicine into a user's body, a reservoir unit fluidly connected to the needle assembly and having a plunger therein, a drive unit including a rod connected to the plunger and moving along the reservoir unit, and a drive wheel connected to the rod and transmitting a driving force to the rod, a connecting member connected to one side of the drive wheel and rotating together with the rotation of the drive wheel, and a grip member arranged to surround at least a portion of an outer circumferential surface of the connection member.

[0008] Additionally, the driving wheel may include at least one fastening portion formed to protrude in a direction toward the connecting member.

[0009] Additionally, the above fastening portion may be formed in multiple numbers spaced apart along the perimeter of the above connecting member.

[0010] Additionally, the grip member may be a spring member formed to surround at least a portion of the periphery of the connecting member.

[0011] Additionally, the grip member may be formed to surround at least a portion of the periphery of the connecting member and may be a ring member with at least one area open.

[0012] Additionally, the grip member may be positioned to contact the driving wheel.

[0013] Additionally, the grip member may rotate simultaneously with the driving wheel, but may not rotate relatively.

[0014] In addition, the reservoir unit includes a reservoir having an internal space for storing a liquid and a reservoir cap mounted on one side of the reservoir, and the reservoir cap may have a space for accommodating the grip member.

[0015] Additionally, the grip member may be positioned to contact one surface of the reservoir cap.

[0016] The drug injection device and its driving method according to the present invention can be operated simply and safely by a user. When the user rotates the sleeve of the needle assembly, the cannula of the needle assembly is inserted into the target object, thereby completing preparation for drug injection. At the same time, the connecting member connects the drive unit and the drive module, so that the drug can be injected from the reservoir into the needle, and the drive module is simultaneously initiated. Therefore, the user can safely initiate operation of the drug injection device by simply rotating the needle assembly.

[0017] The drug injection device and its driving method according to the present invention can safely inject a drug in a given amount into a subject by driving and connecting a structure for discharging the drug by a connecting member after the cannula of the needle assembly is inserted into the subject.

[0018] The drug injection device and its driving method according to the present invention are intuitively initiated by the rotation of the needle assembly, thereby enabling confirmation of normal operation of the driving module and driving unit. Accordingly, the coupling of the driving unit and the connecting member can be performed efficiently and without failure, thereby ensuring user safety. Of course, the scope of the present invention is not limited by these effects.

[0019] FIG. 1 is a perspective view illustrating a liquid injection device according to one embodiment of the present invention.

[0020] Figure 2 is a perspective view showing the internal arrangement of the liquid injection device of Figure 1.

[0021] FIG. 3 is a perspective view illustrating a drive assembly according to one embodiment of the present invention.

[0022] Figure 4 is a perspective view illustrating the driving wheel of Figure 3.

[0023] Figure 5 is a front view showing the driving wheel of Figure 3.

[0024] Figure 6 is an enlarged view of the X portion of Figure 4.

[0025] Fig. 7 is a perspective view illustrating the connecting member of Fig. 3.

[0026] Fig. 8 is a perspective view showing a modified example of the driving wheel of Fig. 3.

[0027] Fig. 9 is a front view showing a modified example of the driving wheel of Fig. 3.

[0028] Figure 10 is an enlarged view of the Y portion of Figure 8.

[0029] Fig. 11 is a perspective view showing a modified example of the connecting member of Fig. 3.

[0030] Fig. 12 is a perspective view showing another modified example of the connecting member of Fig. 3.

[0031] Figures 13 to 15 are cross-sectional views illustrating a drive for storing a drug by injecting the drug into a reservoir and discharging the drug through a needle.

[0032] Figures 16 to 19 are drawings for explaining the operation of the drive assembly.

[0033] FIG. 20 is a perspective view illustrating a drive assembly according to another embodiment of the present invention.

[0034] Figure 21 is an exploded perspective view of the drive assembly of Figure 20.

[0035] Fig. 22 is a perspective view showing the outer shaft of Fig. 21.

[0036] Figures 23 to 25 are cross-sectional views illustrating a drive for storing a drug by injecting the drug into a reservoir through the drive assembly of Figure 20 and discharging the drug through a needle.

[0037] FIG. 26 is a perspective view illustrating a drive assembly according to another embodiment of the present invention.

[0038] Figure 27 is an enlarged view of the Z portion of Figure 26.

[0039] Figure 28 is an exploded perspective view of the drive assembly of Figure 26.

[0040] Fig. 29 is a perspective view showing a modified example of the drive assembly of Fig. 26.

[0041] Fig. 30 is an exploded perspective view of the drive assembly of Fig. 29.

[0042] FIG. 31 is a perspective view illustrating a drive assembly according to another embodiment of the present invention.

[0043] Figure 32 is an enlarged view of the U portion of Figure 31.

[0044] Figure 33 is an exploded perspective view of the drive assembly of Figure 31.

[0045] FIG. 34 is a perspective view illustrating a reservoir unit according to another embodiment of the present invention.

[0046] Figure 35 is an exploded perspective view of the reservoir unit of Figure 34.

[0047] Fig. 36 is a cross-sectional view illustrating the connection structure of the reservoir unit and the drive unit of Fig. 34.

[0048] FIG. 37 is a perspective view illustrating a drive assembly according to another embodiment of the present invention.

[0049] Figure 38 is an enlarged view of part V of Figure 37.

[0050] Figure 39 is an exploded perspective view of the drive assembly of Figure 37.

[0051] The present invention is capable of various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the present invention, as well as the methods for achieving them, will become clearer with reference to the embodiments described in detail below, along with the drawings. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various forms.

[0052] 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 reference numerals and redundant descriptions thereof will be omitted.

[0053] In the examples below, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0054] 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 preclude the possibility that one or more other features or components may be added.

[0055] In some embodiments, where implementations are otherwise feasible, specific process sequences may be performed in a different order than described. For example, two processes described in succession may be performed substantially simultaneously, or in a reverse order from the described order.

[0056] For convenience of explanation, the sizes of components in the drawings may be exaggerated or reduced. For example, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the following embodiments are not necessarily limited to those shown.

[0057] FIG. 1 is a perspective view illustrating a liquid injection device according to one embodiment of the present invention.

[0058] Referring to Fig. 1, the drug injection device (1') is attached to a drug injection target and can inject the drug stored therein at a predetermined amount set by the user. In an optional embodiment, the drug injection device (1') can be mounted on the user's body. In another optional embodiment, the drug injection device (1') can also be mounted on an animal to inject the drug.

[0059] The drug injection device (1') can be used for various purposes depending on the type of drug to be injected. For example, the drug may include an insulin-type drug for diabetic patients, other drugs for the pancreas, drugs for the heart, and other various types of drugs.

[0060] The drug injection device (1') can be connected to a remote device (2') connected by wire or wirelessly. The user can use the drug injection device (1') by operating the remote device (2') and monitor the usage status of the drug injection device (1').

[0061] For example, the amount of the drug injected from the drug injection device (1'), the number of times the drug is injected, the amount of the drug stored in the reservoir unit (200'), the user's bio-information, etc. can be monitored, and the user can operate the drug injection device (1') based on this.

[0062] In one embodiment, the remote device (2') means a communication terminal that can use an application in a wired or wireless communication environment.

[0063] Here, the remote device (2') may be a user's portable terminal. To explain in more detail, the remote device (2') may include any form of a computer (e.g., a desktop, a laptop, a tablet, etc.), a media computing platform (e.g., a cable or satellite set-top box, a digital video recorder), a handheld computing device (e.g., a PDA, an email client, etc.), a mobile phone, a wearable device that can be attached or worn on the user's body, or any form of other types of computing or communication platforms, but the present invention is not limited thereto.

[0064] The drug injection device (1') and the remote device (2') can communicate via a communication network. In this case, the communication network refers to a communication network that provides a connection path so that the remote device (2') can transmit and receive data after connecting to a service server (not shown). The communication network may include wired networks such as LANs (Local Area Networks), WANs (Wide Area Networks), MANs (Metropolitan Area Networks), and ISDNs (Integrated Service Digital Networks), or wireless networks such as wireless LANs, CDMA, Bluetooth, and satellite communication, but the scope of the present invention is not limited thereto.

[0065] According to FIG. 1, the remote device (2') is depicted as a single device, but the present invention is not necessarily limited thereto and may include a plurality of devices capable of communicating with the drug injection device (1').

[0066] Figure 2 is a perspective view showing the internal arrangement of the liquid injection device of Figure 1.

[0067] Referring to FIGS. 1 and 2, one embodiment of a drug injection device (1') may include a housing (5') covering an outer side, and an attachment portion (6') positioned adjacent to a user's skin. The drug injection device (1') includes a plurality of components arranged in an internal space between the housing (5') and the attachment portion (6'). A separate bonding means may be further interposed between the attachment portion (6') and the user's skin, and the drug injection device (1') may be fixed to the skin by the bonding means.

[0068] The drug injection device (1') may include a base body (50'), a needle assembly (100'), a reservoir unit (200'), a driving unit (400'), and a connecting member (500'). Furthermore, the drug injection device (10') may further include a driving module (300'), a trigger member (700'), and a battery (800'). Meanwhile, the driving unit (400') and the connecting member (500') may be collectively referred to as a driving assembly (600').

[0069] The base body (50') forms the basic frame of the housing (5') and is mounted in the internal space of the housing (5'). The base body (50') may be provided in multiple pieces. In one embodiment, the base body may include a first body (50a') that covers the upper side of the internal components and a second body (50b') that covers the lower side of the internal components. The first body (50a') and the second body (50b') may be assembled to fix the internal components of the liquid injection device (1') to a preset position. In another embodiment, the base body may be formed as a single, integral frame.

[0070] The needle assembly (100') can be mounted on the base body (50'). The needle assembly (100') can move the needle (N) and / or the cannula axially by rotation of the sleeve (110').

[0071] One end of the needle (N) is connected to the reservoir unit (200') so that the liquid can be delivered, and the other end is inserted into the cannula so that it can move along the cannula.

[0072] Since the above cannula has a conduit shape that can accommodate a needle (N), the drug solution discharged from the needle (N) can be injected into the user.

[0073] The drug injection device (1') allows the user to simply rotate the needle assembly (100') to insert the cannula into a subject and initiate drug injection. Specifically, when the user rotates the sleeve (110') once, the cannula is inserted into the subject, and when the user rotates it a second time, the needle (N) can be withdrawn from the subject. At this time, with only the cannula inserted into the subject, the knob (101') applies pressure to one end of the trigger member (700'), thereby driving the drive module (300') to deliver the drug, and the drug can be quantitatively discharged from the reservoir unit (200'). Therefore, the user can conveniently and stably use the drug injection device (1').

[0074] The reservoir unit (200') is mounted on the base body (50') and can be connected to the needle assembly (100'). The reservoir unit (200') can include a reservoir (210'), a cap cover (220'), a plunger (230'), and a sealing ring (240') (see FIGS. 13 to 15, etc.).

[0075] The reservoir (210') can be extended to a preset length in the longitudinal direction and store a liquid in the internal space. The reservoir (210') can discharge the liquid through the needle (N) by the movement of the plunger (230'). A cap cover (220') is mounted on the end of the reservoir (210'), and a rod (410') and / or a connecting member (500') can move through an opening (225') arranged in the cap cover (220') (see FIGS. 13 to 15, etc.).

[0076] The reservoir (210') may have an inlet and an outlet. The inlet is used to inject a chemical solution, and a needle (N) is installed at the outlet, through which the chemical solution can be discharged.

[0077] The plunger (230') is placed inside the reservoir (210') and can move linearly by the driving of the driving module (300') and the driving unit (400'). As the plunger (230') advances, the liquid can be discharged from the internal space to the needle (N).

[0078] The plunger (230') may have an end (231') and an inclined surface (232'). The end (231') may move toward the front (210F') of the reservoir (210') to move the liquid. The inclined surface (232') may be in close contact with the inclined portion of the reservoir (210') (see FIGS. 13 to 15, etc.).

[0079] The plunger (230') is provided with a sealing ring (240') at a portion that comes into contact with the inner wall of the reservoir (210'), thereby preventing the liquid from leaking when the plunger (230') moves (see FIGS. 13 to 15, etc.).

[0080] The drive module (300') can generate a driving force and transmit the driving force to the drive unit (400'). The driving force transmitted by the drive unit (400') can linearly move the plunger (230') inside the reservoir (210') to discharge the liquid.

[0081] When the drive units (400') are connected to each other by the connecting member (500'), the drive module (300') rotates the drive wheel (420') of the drive unit (400'), and the rotation of the drive wheel (420') causes the rod (410') to move linearly, thereby moving the plunger (230').

[0082] The drive module (300') can be any type of device that has a liquid suction force and a liquid discharge force by electricity. For example, any type of pump, such as a mechanical displacement type micropump and an electromagnetic motion type micropump, can be used. A mechanical displacement type micropump is a pump that uses the movement of a solid or fluid, such as a gear or diagram, to generate a pressure difference to induce a fluid flow, and includes a diaphragm displacement pump, a fluid displacement pump, a rotary pump, etc. An electromagnetic motion type micropump is a pump that uses electric or magnetic energy directly to move a fluid, and includes an electrohydrodynamic pump (EHD), an electroosmotic pump, a magnetohydrodynamic pump, an electrowetting pump, etc.

[0083] In one embodiment, the drive module (300') can be electrically connected to a remote device (2'), and the drive module (300') can be operated through control of the remote device (2').

[0084] The driving unit (400') is installed between the driving module (300') and the reservoir unit (200') and can move the plunger (230') placed in the reservoir (210') with the driving force generated by the driving module (300'). However, the driving unit (400') can move the plunger (230') forward only when the rod (410') and the driving wheel (420') are coupled or connected by a connecting member (500') (see FIGS. 13 to 15, etc.).

[0085] The rod (410') is connected to the plunger (230') and extends in one direction. The rod (410') is inserted into the opening of the cap cover (220'), and the rod (410') can move in the longitudinal direction of the reservoir (210') to move the plunger (230') (see FIGS. 13 to 15, etc.).

[0086] The drive wheel (420') is drivably connected to the drive module (300') and can rotate by the drive of the drive module (300').

[0087] The driving wheel (420') may be provided with a plurality of fastening portions (440') (see FIG. 3, etc.). In FIG. 3, the driving wheel (420') is illustrated as having three fastening portions (440') at the inlet, but the present invention is not necessarily limited thereto, and the driving wheel (420') may be provided with two or four or more fastening portions (440') at the inlet.

[0088] The driving wheel (420') has a first connecting end (421') and a second connecting end (422'), and may have a space therein in which a load (410') and a connecting member (500') can move. At least one of the first connecting end (421') and the second connecting end (422') is always drivably connected to the driving module (300') by a connector (not shown), so that the driving wheel (420') can rotate by driving the driving module (300').

[0089] In one embodiment, the first connecting end (421') and the second connecting end (422') may have a gear tooth shape. The connector connected to the driving module (300') may apply force to the gear teeth to rotate the driving wheel (420').

[0090] In one embodiment, the connector can be repeatedly rotated about a rotational axis according to the linear reciprocating motion of the drive module (300'). An end of the connector can rotate the drive wheel (420') by applying force to at least one of the first connection end (421') and the second connection end (422'). For example, one end of the connector can be arranged to apply force to the first connection end (421'), and the other end of the connector can be arranged to apply force to the second connection end (422').

[0091] However, it is not limited to this, and the connector can be formed in various shapes to rotate the driving wheel (420') while being rescued.

[0092] The trigger member (700') can generate a mechanical signal for injecting the drug of the drug injection device (10'). The trigger member (700') is rotatably arranged on one side of the base body (50'), and the trigger member (700') can rotate to initiate driving of the driving module (300').

[0093] The other end of the trigger member (700') extends to the drive module (300'), and the starter (750') can keep the drive shaft of the drive module (300') fixed by the other end of the trigger member (700').

[0094] In detail, when the user rotates the needle assembly (100'), the knob of the needle assembly (100') applies force to one end of the trigger member (700'), so that rotation of the trigger member (700') can be initiated. When the trigger member (700') rotates, the starter (750') releases contact with the other end of the trigger member (700'), thereby applying force to the drive shaft, so that driving of the drive module (300') can be initiated.

[0095] In one embodiment, the starter (750') may be formed in the form of a spring having a preset elasticity, but is not limited thereto and may be formed in the form of a stick having a predetermined elasticity.

[0096] The starter (750') is mounted at one end on the base body (50') and the other end is positioned to support the end of the trigger member (700'). One end of the starter (750') is positioned between the end of the drive shaft and the other end of the trigger member (700').

[0097] The battery (800') can supply power to the drug injection device (1'). The battery (800') is connected to the driving module (300') and can control the operation of the driving module (300'). The battery (800') can be rechargeable or disposable.

[0098] The drawing shows a pair of batteries (800'), but is not limited thereto, and can be set in various ways depending on the capacity, usage range, usage time, etc. of the liquid injection device (1').

[0099] A drug injection device (1') according to one embodiment of the present invention can be operated simply and safely by a user. When a user rotates the sleeve (110') of the needle assembly (100'), the cannula of the needle assembly (100') is inserted into a target object, and the connecting member (500') connects the driving unit (400') so that the drug can be injected by driving the driving module (300'), and at the same time, the driving of the driving module (300') is initiated, so that the drug injection device (1') can be used simply and safely.

[0100] According to one embodiment of the present invention, a drug injection device (1') has a structure for discharging a drug by a connecting member (500') that is driven and connected after the cannula of the needle assembly (100') is inserted into a subject, so that a safe and accurate amount of drug can be injected into the subject.

[0101] According to one embodiment of the present invention, the liquid injection device (1') is intuitively started to operate by the rotation of the needle assembly (100'), and through this, it is possible to confirm whether the driving module (300') and the driving unit (400') are operating normally, and accordingly, the coupling of the driving unit (400') and the connecting member (500'), i.e., the operation of the driving assembly (600') can be performed efficiently without failure, thereby ensuring user safety.

[0102] Fig. 3 is a perspective view illustrating a drive assembly according to one embodiment of the present invention. Fig. 4 is a perspective view illustrating the drive wheel of Fig. 3, Fig. 5 is a front view illustrating the drive wheel of Fig. 3, and Fig. 6 is an enlarged view of a portion X of Fig. 4. Fig. 7 is a perspective view illustrating a connecting member of Fig. 3.

[0103] Referring to FIGS. 2 and 3, a drive assembly (600') according to one embodiment of the present invention may include a drive unit (400') and a connecting member (500').

[0104] The drive unit (400') may include a drive wheel (420').

[0105] The drive wheel (420') may serve to transmit driving force to the load (410') so that the load (410') can move linearly. For example, when the drive wheel (420') is coupled or engaged with the load (410') by a connecting member (500'), the drive wheel (420') may move the load (410') linearly with the driving force generated from the drive module (300'). The load (410') may move the plunger (230') linearly while moving linearly.

[0106] The drive wheel (420') can be drivably connected to the drive module (300'). For example, the drive wheel (420') can be rotated by the drive of the drive module (300').

[0107] The driving wheel (420') has a first connecting end (421') and a second connecting end (422'), and may have a space therein in which a load (410') and a connecting member (500') can move. At least one of the first connecting end (421') and the second connecting end (422') is always drivably connected to the driving module (300') by a connector (not shown), so that the driving wheel (420') can rotate by driving the driving module (300').

[0108] As an example, the first connecting end (421') and the second connecting end (422') may have a gear tooth shape. The connector connected to the driving module (300') may apply force to the gear teeth to rotate the driving wheel (420').

[0109] In one embodiment, the connector repeatedly rotates about the rotation axis according to the linear reciprocating motion of the drive module (300'). An end of the connector can rotate the drive wheel (420') by applying force to at least one of the first connection end (421') and the second connection end (422'). For example, one end of the connector can be arranged to apply force to the first connection end (421'), and the other end of the connector can be arranged to apply force to the second connection end (422').

[0110] However, it is not limited to this, and the connector can be formed in various shapes to rotate the driving wheel (420') while being rescued.

[0111] A connecting member (500') can kinetically connect a driving module (300') and a driving unit (400'). The connecting member (500') can be positioned between a load (410') and a driving wheel (420'). In addition, the connecting member (500') can be coupled to the load (410').

[0112] The connecting member (500') may be selectively connectable to the driving wheel (420'). For example, the connecting member (500') may not be connected to the driving wheel (420') before the liquid injection device (1') injects the liquid into the object. In addition, the connecting member (500') may be connected to the driving wheel (420') during the liquid injection device (1') injects the liquid into the object.

[0113] As an example, the connecting member (500') can be engaged with the drive wheel (420') by rotation of the drive wheel (420').

[0114] The connecting member (500') may include a fastening region (560') that forms a fastening with the driving wheel (420') and a non-fastening region (550') that does not form a fastening with the driving wheel (420').

[0115] In one embodiment, the connecting member (500') may include an unfastened region (550') that has a length from one end and is not fastened to the driving wheel (420'). For example, the unfastened region (550') may be formed to extend from the proximal end of the connecting member (500') toward the distal end to have a predetermined length. In addition, the connecting member (500') may include an engaging region (560') that is connected to the unfastened region (550') and receives at least a portion of the engaging portion (440') by rotation of the driving wheel (420') to be fastened to the driving wheel (420'). The engaging region (560') may be formed to extend from one end of the unfastened region (550') toward the distal end of the connecting member (500') to have a predetermined length. Here, the direction toward the proximal end of the connecting member (500') may mean a direction approaching the driving wheel (420'), and the direction toward the distal end may mean a direction away from the driving wheel (420').

[0116] In this way, the connecting member (500') may or may not transmit the driving force due to the rotation of the driving wheel (420') to the load (410') depending on whether it is connected to the driving wheel (420').

[0117] The driving wheel (420') may include at least one fastening portion (440') formed to protrude in one direction. For example, the fastening portion (440') may be formed to protrude distally from one surface of the first connecting end (421') of the driving wheel (420').

[0118] The fastening member (440') can perform the role of fastening the driving wheel (420') and the connecting member (500').

[0119] As one embodiment, the fastening member (440') may be coupled to the connecting member (500') by being at least partially inserted into the connecting member (500') when the driving wheel (420') rotates.

[0120] The fastening portion (440') may be formed in multiple numbers spaced apart along the circumference of the connecting member (500'). As a specific example, the fastening portion (440') may be formed to surround the circumference of the connecting member (500') based on a state in which the connecting member (500') is inserted into a space provided in the driving wheel (420'). To express this from another perspective, it may be said that the fastening portion (440') is formed in multiple numbers to surround the space provided in the driving wheel (420').

[0121] Although the drawing shows that three fastening parts (440') are formed, it is not limited to this and the number may be less than three or more than three.

[0122] The fastening portion (440') may include a fastening block (441') that is formed to protrude in a direction toward the rotation axis of the driving wheel (420'). For example, the fastening block (441') may be formed to protrude in a direction toward the central rotation axis of the driving wheel (420') with reference to FIG. 15. When a plurality of fastening portions (440') are formed, the fastening block (441') may be formed in each fastening portion (440').

[0123] The fastening block (441') can be inserted into the connecting member (500') when the driving wheel (420') rotates. For example, when the driving wheel (420') rotates relative to the connecting member (500'), the fastening block (441') can be inserted into at least a portion of the connecting member (500'). As a specific example, the fastening block (441') can be inserted into the trap groove (563') of the connecting member (500') as described below.

[0124] As an example, the fastening portion (440') may include a blocking wall (442') formed to extend in a direction toward the rotational axis of the driving wheel (420'). For example, the blocking wall (442') may refer to a wall formed in a direction toward the rotational axis of the driving wheel (420'). From another perspective, the blocking wall (442') may refer to one surface formed to extend in a direction toward the rotational axis of the driving wheel (420') from a region formed along the perimeter of a space provided in the driving wheel (420').

[0125] The barrier wall (442') can set a relative rotation limit between the drive wheel (420') and the connecting member (500'). For example, the drive wheel (420') can be fastened to the connecting member (500') by rotating relative to the connecting member (500'). In this case, when the drive wheel (420') rotates relative to the connecting member (500') by a preset angle, the barrier wall (442') can come into contact with at least a portion of the connecting member (500'). Accordingly, the drive wheel (420') can no longer rotate relative to the connecting member (500') when the barrier wall (442') comes into contact with at least a portion of the connecting member (500'). That is, the drive wheel (420') and the connecting member (500') can be fastened to each other.

[0126] In this way, after the driving wheel (420') and the connecting member (500') are connected, the driving wheel (420') can rotate together with the connecting member (500') by the driving force received from the driving module (300'). Specifically, when the driving wheel (420') is further rotated after the driving wheel (420') and the connecting member (500') are connected, the connecting member (500') and the driving wheel (420') rotate together, and the load (410') can move forward by the rotation of the connecting member (500').

[0127] As an optional embodiment, the fastening block (441') may include a plurality of surfaces having different slopes. For example, the fastening block (441') may include a first guide surface (441a') and a second guide surface (441b'), and the first guide surface (441a') and the second guide surface (441b') may have different slopes.

[0128] Specifically, referring again to FIG. 6, the first guide surface (441a') may be located far from the blocking wall (442'), and the second guide surface (441b') may be located between the first guide surface (441a') and the blocking wall (442').

[0129] The first guide surface (441a') may be formed in a direction that converges with each other as it moves away from the blocking wall (442'). As an example, the first guide surface (441a') may be formed in a shape that becomes sharper or at least curved as it moves away from the blocking wall (442').

[0130] The first guide surface (441a') can guide the movement path of the fastening block (441') so that the fastening block (441') can be easily inserted into the connecting member (500'). That is, since one end of the first guide surface (441a') is formed in a shape that converges with each other, the fastening block (441') can be stably inserted into the connecting member (500') (more specifically, the trap groove (563') of the connecting member (500')) without getting caught.

[0131] The second guide surface (441b') may be formed to extend from the first guide surface (441a') toward the blocking wall (442'). The second guide surface (441b') may be formed to have a length. Accordingly, when the fastening block (441') is inserted into the trap groove (563') of the connecting member (500'), the second guide surface (441b') may come into contact with at least a portion of the connecting member (500') (more specifically, the rib (562') of the connecting member (500')), and the fastening block (441') may be stably fastened to the connecting member (500').

[0132] Referring to FIG. 7, the connecting member (500') may include a first portion (510') adjacent to the plunger (230') and a second portion (520') connected to the first portion (510') and having a larger diameter than the first portion (510'). That is, with reference to FIG. 7, the second portion (520') may refer to an outer surface of the connecting member (500'), and the first portion (510') may refer to a portion formed on the inner side of the second portion (520'). Expressed from another perspective, the connecting member (500') may be formed in a shape in which a portion of a cylinder is roughly recessed inward. In this case, the outermost surface of the connecting member (500') may be defined as the second portion (520'), and the surface of the recessed portion may be defined as the first portion (510').

[0133] The connecting member (500') may include a guide groove.

[0134] The guide groove may be defined by a step difference between the first portion (510') and the second portion (520'). As previously described, since the first portion (510') and the second portion (520') have different diameters, the first portion (510') and the second portion (520') may have a step difference, as illustrated in FIG. 17. In this case, the area formed between the first portion (510') and the second step by the step difference may be defined as the guide groove.

[0135] The guide groove can guide the movement of the fastening member (440') and the trigger member (700'). That is, the fastening member (440') and the trigger member (700') can move along the guide groove. Of course, this can mean that the fastening member (440') and the trigger member (700') move linearly while the connecting member (500') is inserted into the driving wheel (420').

[0136] As an example, the connecting member (500') may further include a third portion (570'). The third portion (570') may refer to a portion extending from the second portion (520') toward the first portion (510').

[0137] The third portion (570') may be formed to extend from the second portion (520') toward the first portion (510') to have a width. The third portion (570') may have a larger diameter than the first portion (510'). In other words, the first portion (510') may refer to a portion that is finer inwardly of the connecting member (500') than the third portion (570'). In other words, the third portion (570') may be formed to extend from the second portion (520') to cover at least a portion of the first portion (510').

[0138] As an optional embodiment, the third portion (570') may have a diameter larger than that of the first portion (510') and smaller than that of the second portion (520'). At this time, the blocking wall (442') of the fastening portion (440') may extend further toward the rotational axis of the driving wheel (420') than the fastening block (441'). Accordingly, the height difference between the blocking wall (442') and the fastening block (441') may correspond to the height difference between the first portion (510') and the third portion (570'). In addition, the height of the fastening block (441') may correspond to the height difference between the third portion (570') and the second portion (520').

[0139] Accordingly, when the driving wheel (420') is to rotate relatively to the connecting member (500'), at least a portion of the blocking wall (442') may come into contact with the stepped portions of the first portion (510') and the third portion (570'), and the fastening block (441') may come into contact with the stepped portions of the second portion (520') and the third portion (570'). Accordingly, the driving wheel (420') may not be able to rotate relatively to the connecting member (500') at a location that is not an appropriate location (e.g., not a location in the fastening area (560')).

[0140] As an optional embodiment, the third portion (570') may be formed to overlap a portion of the second portion (520'). Accordingly, with reference to FIG. 7, the guide grooves may be formed to have different widths along the longitudinal direction.

[0141] As a specific embodiment, the guide groove may include a first guide groove (551') provided at a position where the second part (520') and the third part (570') overlap, and a second guide groove (561') provided at a position where the second part (520') and the third part (570') do not overlap.

[0142] The first guide groove (551') may have a smaller width than the second guide groove (561').

[0143] Accordingly, the driving wheel (420') can rotate relative to the connecting member (500') only by an amount corresponding to the width of the guide groove while at least a portion of the fastening portion (440') (e.g., the fastening block (441')) is accommodated in the guide groove. For example, the driving wheel (420') can rotate at a relatively larger angle relative to the connecting member (500') when the fastening block (441') is positioned in the second guide groove (561') than when the fastening block (441') is positioned in the first guide groove (551').

[0144] As an example, the connecting member (500') may include a plurality of ribs (562') formed in the fastening area (560') and a trap groove (563') provided between the ribs (562'). The trap groove (563') may be connected to the second guide groove (561').

[0145] The trap home (563') can accommodate at least a portion of the fastening portion (440'). For example, the trap home (563') can accommodate the fastening block (441').

[0146] The rib (562') may be formed to protrude outward from the first portion (510'). For example, the rib (562') may be formed to protrude away from the rotational axis of the connecting member (500') from the first portion (510').

[0147] As an optional embodiment, a plurality of ribs (562') may be formed across the fastening region (560'). Accordingly, a trap groove (563') may be formed between each rib (562').

[0148] Accordingly, the driving wheel (420') and the connecting member (500') can be fastened at various positions. That is, even when the length at which the connecting member (500') is inserted into the driving wheel (420') varies depending on the amount of liquid stored in the reservoir (210'), the fastening block (441') of the fastening portion (440') can overlap with at least one of several trap grooves (563'), and the driving wheel (420') and the connecting member (500') can be fastened by the rotation of the driving wheel (420').

[0149] Hereinafter, variations of the drive wheel and connecting member according to the present invention will be described. In the following examples, details that are identical to the aforementioned examples or that can be easily modified and utilized by a person of ordinary skill in the art pertaining to the present invention will be omitted or briefly described for convenience of explanation.

[0150] Fig. 8 is a perspective view illustrating a variation of the driving wheel of Fig. 3, Fig. 9 is a front view illustrating a variation of the driving wheel of Fig. 3, and Fig. 10 is an enlarged view of the Y portion of Fig. 8. Fig. 11 is a perspective view illustrating a variation of the connecting member of Fig. 3.

[0151] Referring to FIGS. 8 to 11, the drive wheel (420") may serve to transmit driving force to the load (410') so that the load (410') can move linearly.

[0152] The drive wheel (420") can be drivably connected to the drive module (300'). For example, the drive wheel (420") can be rotated by the drive of the drive module (300').

[0153] The driving wheel (420") has a first connecting end (421") and a second connecting end (422"), and may have a space therein in which a load (410') and a connecting member (500") can move.

[0154] As an example, the first connecting end (421") and the second connecting end (422") may have a gear tooth shape. The connector connected to the driving module (300') may apply force to the gear teeth to rotate the driving wheel (420").

[0155] The connecting member (500") can drivably connect the driving module (300') and the driving unit (400"). The connecting member (500") can be placed between the load (410') and the driving wheel (420").

[0156] The connecting member (500") may be selectively connectable to the driving wheel (420"). For example, the connecting member (500") may not be connected to the driving wheel (420") before the liquid injection device (1') injects the liquid into the object. In addition, the connecting member (500") may be connected to the driving wheel (420") in the step where the liquid injection device (1') injects the liquid into the object.

[0157] As an example, the connecting member (500") can be engaged with the drive wheel (420") by rotation of the drive wheel (420").

[0158] The driving wheel (420") may include at least one fastening portion (440") formed to protrude in one direction. For example, the fastening portion (440") may be formed to protrude distally from one surface of the first connecting end (421") of the driving wheel (420").

[0159] The fastening member (440") can perform the role of fastening the driving wheel (420") and the connecting member (500").

[0160] As one embodiment, the fastening member (440") may be coupled to the connecting member (500") by being at least partially inserted into the connecting member (500") when the driving wheel (420") rotates.

[0161] A plurality of fastening members (440") may be formed to be spaced apart along the circumference of the connecting member (500"). As a specific example, the fastening members (440") may be formed to surround the circumference of the connecting member (500") based on a state in which the connecting member (500") is inserted into a space provided in the driving wheel (420").

[0162] Although the drawing shows that three fastening parts (440") are formed, it is not limited to this and it is of course possible to have three or more fastening parts, as well as fewer than three.

[0163] The fastening portion (440") may include a fastening block (441") formed to protrude in a direction toward the rotation axis of the driving wheel (420"). For example, the fastening block (441") may be formed to protrude in a direction toward the central rotation axis of the driving wheel (420") with reference to FIG. 18. When a plurality of fastening portions (440") are formed, the fastening block (441") may be formed in each fastening portion (440").

[0164] As an example, the fastening portion (440") may include a blocking wall (442") formed to extend in a direction toward the rotational axis of the driving wheel (420"). For example, the blocking wall (442") may mean a wall formed in a direction toward the rotational axis of the driving wheel (420").

[0165] The barrier wall (442") can set a relative rotation limit between the drive wheel (420") and the connecting member (500"). For example, the drive wheel (420") can be fastened to the connecting member (500") by rotating relative to the connecting member (500"). In this case, when the drive wheel (420") rotates by a preset angle relative to the connecting member (500"), the barrier wall (442") can come into contact with at least a portion of the connecting member (500"). Accordingly, the drive wheel (420") can no longer rotate relative to the connecting member (500") when the barrier wall (442") comes into contact with at least a portion of the connecting member (500"). In other words, the drive wheel (420") and the connecting member (500") can be fastened to each other.

[0166] In this way, once the drive wheel (420") and the connecting member (500") are connected, the drive wheel (420") can rotate together with the connecting member (500") by the driving force received from the drive module (300').

[0167] As an optional embodiment, the fastening block (441") may include a plurality of surfaces having different slopes. For example, the fastening block (441") may include a first guide surface (441a") and a second guide surface (441b"), and the first guide surface (441a") and the second guide surface (441b") may have different slopes.

[0168] Specifically, referring again to FIG. 10, the first guide surface (441a") may be positioned far from the blocking wall (442"), and the second guide surface (441b") may be positioned between the first guide surface (441a") and the blocking wall (442").

[0169] The first guide surface (441a") may be formed in a direction that converges with each other as it moves away from the blocking wall (442"). As an example, the first guide surface (441a") may be formed in a shape that becomes sharper or at least curved as it moves away from the blocking wall (442").

[0170] The first guide surface (441a") can guide the movement path of the fastening block (441") so that the fastening block (441") can be easily inserted into the connecting member (500"). That is, since one end of the first guide surface (441a") is formed in a shape that converges with each other, the fastening block (441") can be stably inserted into the connecting member (500") (more specifically, the trap groove (563") of the connecting member (500")) without getting caught.

[0171] The second guide surface (441b") may be formed to extend from the first guide surface (441a") toward the blocking wall (442"). The second guide surface (441b") may be formed to have a length. Accordingly, when the fastening block (441") is inserted into the trap groove (563") of the connecting member (500"), the second guide surface (441b") may come into contact with at least a portion of the connecting member (500") (more specifically, the rib (562") of the connecting member (500")), and the fastening block (441") may be stably fastened to the connecting member (500").

[0172] The fastening portion (440") may further include a protrusion (443") protruding inward.

[0173] The protrusion (443") may be formed so that at least a portion thereof protrudes from the barrier (442") in a direction toward the central rotation axis of the driving wheel (440").

[0174] As an example, the protrusions (443") may be formed on each of the plurality of fastening members (440"). For example, the protrusions (443") may be formed on each of the blocking walls (442").

[0175] As described later, the protrusion (443") can guide the connection between the connecting member (500") and the driving wheel (400") by being caught on a plurality of ribs formed in the connecting member (500") while the connecting member (500") is being inserted into a space provided in the driving wheel (400").

[0176] The connecting member (500") may include a fastening region (560") that forms a fastening with the driving wheel (420") and a non-fastening region (550") that does not form a fastening with the driving wheel (420").

[0177] As an example, the connecting member (500") may include an unfastened region (550") that has a length from one end and is not fastened to the drive wheel (420"). In addition, the connecting member (500") may include an engaging region (560") that is connected to the unfastened region (550") and receives at least a portion of the fastening portion (420") by rotation of the drive wheel (420") to be fastened to the drive wheel (420").

[0178] The connecting member (500") may include a first portion (510") adjacent to the plunger (230') and a second portion (520") connected to the first portion (510") and having a larger diameter than the first portion (510"). That is, with reference to FIG. 11, the second portion (520") may refer to the outer surface of the connecting member (500"), and the first portion (510") may refer to a portion formed on the inner side of the second portion (520").

[0179] As an example, the connecting member (500") may further include a third portion (570"). The third portion (570") may refer to a portion extending from the second portion (520") toward the first portion (510").

[0180] The third portion (570") may be formed to extend toward the first portion (510") to have a width from the second portion (520"). The third portion (570") may have a larger diameter than the first portion (510"). In other words, the first portion (510") may refer to a portion that is finer toward the inside of the connecting member (500") than the third portion (570"). In other words, the third portion (570") may be formed to extend from the second portion (520") to cover at least a portion of the first portion (510").

[0181] As an optional embodiment, the third portion (570") may have a diameter larger than that of the first portion (510") and smaller than that of the second portion (520"). At this time, the blocking wall (442") of the fastening portion (420") may extend further toward the rotational axis of the driving wheel (420") than the fastening block (441"). Accordingly, the height difference between the blocking wall (442") and the fastening block (441") may correspond to the height difference between the first portion (510") and the third portion (570"). In addition, the height of the fastening block (441") may correspond to the height difference between the third portion (570") and the second portion (520").

[0182] Accordingly, when the driving wheel (420") is to rotate relatively to the connecting member (500"), at least a portion of the blocking wall (442") may come into contact with the step portions of the first portion (510") and the third portion (570"), and the fastening block (441") may come into contact with the step portions of the second portion (520") and the third portion (570"). Accordingly, the driving wheel (420") may not be able to rotate relatively to the connecting member (500") at a location that is not an appropriate location (e.g., not at the fastening area (560")).

[0183] As an optional embodiment, the third portion (570") may be formed to overlap a portion of the second portion (520").

[0184] As an example, the connecting member (500") may include a plurality of first ribs (562") formed in the fastening area (560") and a trap home (563") provided between the first ribs (562").

[0185] The trap home (563") can accommodate at least a portion of the fastening portion (420"). For example, the trap home (563") can accommodate the fastening block (441").

[0186] The first rib (562") may be formed to protrude outward from the first portion (510"). For example, the first rib (562") may be formed to protrude from the first portion (510") in a direction away from the rotational axis of the connecting member (500").

[0187] As an optional embodiment, a plurality of first ribs (562") may be formed across the fastening area (560"). Accordingly, a trap home (563") may be formed between each of the first ribs (562").

[0188] Accordingly, the driving wheel (420") and the connecting member (500") can be fastened at various positions. That is, even when the length at which the connecting member (500") is inserted into the driving wheel (420") varies depending on the amount of liquid stored in the reservoir (210'), the fastening block (441") of the fastening portion (420") can overlap with at least one of several trap grooves (563"), and the driving wheel (420") and the connecting member (500") can be fastened by the rotation of the driving wheel (420").

[0189] As an example, the connecting member (500") may further include a plurality of second ribs (564") formed in the fastening region (560") and a third rib (565") formed in the unfastening region (550").

[0190] The second rib (564") may be formed to protrude outward from the first portion (510"). For example, the second rib (564") may be formed to protrude away from the rotational axis of the connecting member (500") from the first portion (510"). A plurality of second ribs (564") may be formed across the fastening region (560"). Accordingly, a groove may be formed between each of the second ribs (564").

[0191] The second rib (564") may be formed to be connected to the first rib (562"). For example, the first rib (562") and the second rib (564") may be formed to be continuous in the fastening area (560").

[0192] In one embodiment, the second rib (564") may have a lower height than the first rib (562"). For example, the distance from the central rotational axis of the connecting member (500") to the outermost edge of the second rib (564") may be shorter than the distance from the central rotational axis of the connecting member (500") to the outermost edge of the first rib (562"). Accordingly, a step may be formed between the first rib (562") and the second rib (564").

[0193] The third rib (565") may be formed to protrude outward from the second portion (520"). For example, the third rib (565") may be formed to protrude away from the rotational axis of the connecting member (500") from the second portion (520"). A plurality of third ribs (565") may be formed across the unfastened region (550"). Accordingly, a groove may be formed between each of the third ribs (565").

[0194] The third rib (565") may be formed to be connected to the third portion (570"). For example, the third portion (570") and the third rib (565") may be formed to be continuous in the unfastened area (550").

[0195] The second rib (564") and the third rib (565") may be formed to be continuous with each other. For example, the second rib (564") and the third rib (565") may be formed parallel. Accordingly, the grooves formed between the second ribs (564") and the grooves formed between the third ribs (565") may be arranged continuous with each other.

[0196] By the above configuration, when the connecting member (500") is inserted into the driving wheel (400"), the protrusion (443") can be caught on the second rib (564") and the third rib (565"). For example, when the connecting member (500") is inserted into the driving wheel (400"), the protrusion (443") can be caught on the third rib (565") and the second rib (564") sequentially.

[0197] Specifically, the protrusion (443") can guide the connection position so that the connection member (500") and the driving wheel (400") can be connected at the correct position. The protrusion (443") can be positioned at any one of the spaces formed between the second ribs (564") when the connection member (500") is inserted into the driving wheel (400") at a preset position. At this time, since the spaces between the second ribs (564") correspond to the trap grooves (563"), when the connection member (500") rotates relatively to the driving wheel (400"), the protrusion (443") can be stably inserted into any one of the trap grooves (563"). Therefore, the connection member (500") and the driving wheel (400") can be accurately and stably connected at the preset position.

[0198] In addition, when the connecting member (500") is inserted into the driving wheel (400"), the protrusion (443") is sequentially caught by the third rib (565") and the second rib (564"), so that the protrusion (443") can provide resistance to the connecting member (500"). For example, the connecting member (500") can be inserted into the driving wheel (400") while overcoming the force applied to the third rib (565") and the second rib (564").

[0199] Accordingly, when the drug is injected into the reservoir unit (200'), at least a portion of the drug can first flow into the needle (N) or cannula connected to the reservoir unit (200'). That is, the drug can first flow into the needle (N) or cannula when the connecting member (500") overcomes the resistance caused by the protrusion (443"). As a result, air or bubbles existing in the reservoir unit (200') can be first removed, and a predetermined amount of the drug can be injected into the drug injection device (1').

[0200] Referring again to FIG. 10, as an optional embodiment, the protrusion (443") may be formed in a roughly triangular shape with the direction toward the connecting member (500") being approximately vertical. In other words, the protrusion (443") may be formed thicker in the direction closer to the connecting member (500").

[0201] Accordingly, even if the protrusion (443") is worn by being continuously caught on the third rib (565") and the second rib (564") while the connecting member (500") is inserted into the inside of the driving wheel (400"), the connection between the connecting member (500") and the driving wheel (400") can be guided.

[0202] That is, since the protrusion (443") can be continuously hooked on the third rib (565") and the second rib (564") and even if a part thereof is worn, the shape that can be inserted into the trap home (563") can be maintained, so that the protrusion (443") can guide the connection between the connecting member (500") and the driving wheel (400").

[0203] As an example, the connecting member (500") may further include a fourth portion (580").

[0204] The fourth portion (580") may be formed in the fastening area (560"), and specifically, may be formed on the distal side of the first portion (510"). As an example, the fourth portion (580") may be formed on the distal side of the second rib (564").

[0205] The fourth part (580") is formed on the inside of the first part (510") and can serve to set a limit to which the connecting member (500") is inserted into the inside of the driving wheel (400").

[0206] As a specific embodiment, the fourth portion (580") may have a predetermined thickness. Accordingly, when the connecting member (500") is inserted a predetermined distance into the inside of the driving wheel (400"), the fourth portion (580") comes into contact with at least a portion of the driving wheel (400"), and the connecting member (500") can no longer be inserted into the inside of the driving wheel (400").

[0207] Accordingly, the degree to which the connecting member (500") is inserted into the inside of the driving wheel (400") can be controlled by the fourth part (580").

[0208] For example, the thickness of the fourth portion (580") may be set based on the amount expected to flow into the reservoir unit (200'). Accordingly, when the intended amount of the drug flows into the reservoir unit (200'), the connecting member (500") may no longer be inserted into the driving wheel (400") by the fourth portion (580"), and the injection of the drug may be stopped.

[0209] Hereinafter, other variations of the connecting member will be described. Compared to the previously described embodiments, the connecting member according to this embodiment differs primarily in the presence or absence of a third rib. The following description will focus on these differences. In the following embodiments, details that are identical to the previously described embodiments or that can be easily modified and utilized by a person skilled in the art to which the present invention pertains will be omitted or briefly described for convenience of explanation.

[0210] Fig. 12 is a perspective view showing another modified example of the connecting member of Fig. 3.

[0211] Referring to FIG. 12, a connecting member (500") according to one embodiment may include a plurality of second ribs (564") formed in a fastening area (560").

[0212] The second rib (564") may be formed to protrude outward from the first portion (510"). For example, the second rib (564") may be formed to protrude away from the rotational axis of the connecting member (500") from the first portion (510"). A plurality of second ribs (564") may be formed across the fastening region (560"). Accordingly, a groove may be formed between each of the second ribs (564").

[0213] The second rib (564") may be formed to be connected to the first rib (562"). For example, the first rib (562") and the second rib (564") may be formed to be continuous in the fastening area (560").

[0214] In one embodiment, the second rib (564") may have a lower height than the first rib (562"). For example, the distance from the central rotational axis of the connecting member (500") to the outermost edge of the second rib (564") may be shorter than the distance from the central rotational axis of the connecting member (500") to the outermost edge of the first rib (562"). Accordingly, a step may be formed between the first rib (562") and the second rib (564").

[0215] A rib may not be formed in the unfastened area (550"). That is, compared to the embodiment of the connecting member (500") described with reference to FIG. 11, a third rib (565") may not be formed in the unfastened area (550").

[0216] Accordingly, the amount of wear caused by the protrusion (443") being caught on the rib while the connecting member (500") is inserted into the inside of the driving wheel (400") can be reduced.

[0217] Specifically, since no rib is formed in the unfastened area (550") while the connecting member (500") is inserted into the inside of the driving wheel (400"), the protrusion (443") may not be caught by the rib. That is, when the protrusion (443") is positioned to overlap the unfastened area (550") of the connecting member (500"), the connecting member (500") may be inserted into the inside of the driving wheel (400") without resistance.

[0218] Thereafter, when the protrusion (443") is positioned to overlap with the fastening area (560") of the connecting member (500"), it can be inserted into the inside of the driving wheel (400") while receiving a resistance force. In this case, when the connecting member (500") is inserted into the driving wheel (400"), the protrusion (443") can be continuously caught on the second rib (564").

[0219] Specifically, the protrusion (443") can be positioned in any one of the spaces formed between the second ribs (564") when the connecting member (500") is inserted into the driving wheel (400") to a preset position. Accordingly, the connecting member (500") and the driving wheel (400") can be accurately and stably connected at the preset position.

[0220] In addition, when the connecting member (500") is inserted into the driving wheel (400"), the protrusion (443") is sequentially caught on the plurality of second ribs (564"), so that the protrusion (443") can provide resistance to the connecting member (500"). Accordingly, when the chemical liquid is injected into the reservoir unit (200'), at least a portion of the chemical liquid can first flow into the needle (N) or cannula connected to the reservoir unit (200'). Accordingly, air or bubbles existing in the reservoir unit (200') can be first removed, and a predetermined amount of chemical liquid can be injected into the chemical liquid injection device (1').

[0221] Figures 13 to 15 are cross-sectional views illustrating a drive for storing a drug by injecting the drug into a reservoir and discharging the drug through a needle.

[0222] Referring to FIGS. 3 to 7 and 13 to 15, the connecting member (500') may include a first portion (510') adjacent to the plunger (230') and a second portion (520') connected to the first portion (510') and having a larger diameter than the first portion (510').

[0223] The first part (510') may be provided with a second guide groove (561') that guides the movement of the fastening block (441') of the fastening portion (440') and a trap groove (563') that extends from the second guide groove (561') in the circumferential direction of the connecting member (500'). The trap groove (563') may be connected to the second guide groove (561'). The trap groove (563') may be formed so as to accommodate the fastening block (441').

[0224] As an example, the rod (410') and the connecting member (500') may each have at least a portion in the form of a screw or thread. For example, the outer surface of the rod (410') may have threads formed thereon, and the inner surface of at least one region of the connecting member (500') may have threads formed thereon, thereby allowing them to be connected in a screw-joint manner.

[0225] Referring to FIGS. 13 and 14, when the liquid is injected into the reservoir unit (200'), the connecting member (500') can be moved and inserted into the interior of the driving wheel (420').

[0226] For example, as the liquid is injected into the reservoir unit (200'), the plunger (230') can move in one direction (to the right with reference to FIG. 14) inside the reservoir unit (200'). Accordingly, the connecting member (500') and the rod connected to the plunger (230') can move in a direction toward the inside of the driving wheel (420') and be inserted.

[0227] The trap home (563') can be formed in a plurality along the length direction of the connecting member (500'), and accordingly, even if the amount of the drug injected into the reservoir unit (200') varies, the fastening block (441') can be positioned so as to overlap at least one of the trap homes (563') in the second guide home (561') in the rotational direction of the driving wheel (420').

[0228] Referring to Fig. 14, the driving module (300') can generate driving force to rotate the driving wheel (420') of the driving unit (400'). The trap home (563') can extend along the rotational direction of the driving wheel (420'), so that when the driving wheel (420') rotates, the fastening block (441') is drawn into the inside of the trap home (563'), and at this time, the driving wheel (420') and the connecting member (500') can be coupled to each other.

[0229] That is, the coupling of the drive unit (400') and the connecting member (500') can be performed by rotating the drive wheel (420') through the driving force of the drive module (300'). For example, as described above, before injecting the chemical solution, the drive unit (400') can be test-operated with the driving force of the drive module (300'), and if the drive wheel (420') rotates smoothly without contact with the connecting member (500'), it can be confirmed that the drive unit (400') is operating normally. That is, only by confirming the normal operation of the drive module (300') and the drive unit (400') without the intervention of any other components other than the drive module (300') and the drive unit (400'), the coupling of the drive unit (400') and the connecting member (500'), i.e., the operation of the drive assembly (600') can be efficiently performed without failure.

[0230] Referring to FIG. 15, when the driving wheel (420') rotates further, the connecting member (500') can also rotate together, and at this time, the rod (410') can move forward. That is, since the rod (410') and the connecting member (500') are screw-connected, even if the driving wheel (420') rotates with a small torque, the connecting member (500') can move the rod (410') forward. That is, the plunger (230') can move forward even with a relatively weak force due to the screw connection between the rod (410') and the connecting member (500').

[0231] Hereinafter, the operation of the drive assembly (600') will be described. Hereinafter, the operation of the drive assembly (600') will be described based on the drive assembly (600') described with reference to FIGS. 3 to 7. However, those skilled in the art to which the present invention pertains will understand that the following description can also be applied to modified examples of the drive assembly (600') described above.

[0232] Figures 16 to 19 are drawings for explaining the operation of the drive assembly.

[0233] Figure 16 shows the state before the drug is injected into the reservoir of the drug injection device.

[0234] Referring to FIG. 16, at least a portion of the unfastened area (550') of the connecting member (500') may be inserted into the inside of the driving wheel (420'). In this case, the fastened area (560') may not be inserted into the inside of the driving wheel (420').

[0235] At this time, at least a portion of the fastening block (441') and the trigger member (700') may be positioned in the first guide groove (551').

[0236] Accordingly, the fastening member (440') may be caught on a step connecting the first part (510') and the third part (570') of the connecting member (500') and / or a step connecting the second part (520') and the third part (570'). In addition, the trigger member (700') may be caught on a step connecting the first part (510') and the second part (520') of the connecting member (500').

[0237] Ultimately, the drive wheel (420') may be made to rotate relatively little with respect to the connecting member (500') before the liquid is injected into the reservoir (210') and may not be engaged with the connecting member (500'). That is, this prevents the problem of the drive wheel (420') unexpectedly rotating before the liquid is injected into the reservoir (210').

[0238] Figure 17 shows a state in which a drug is injected into a reservoir of a drug injection device.

[0239] Referring to FIG. 17, the unfastened area (550') of the connecting member (500') can be inserted into the inside of the driving wheel (420'), and at least a portion of the fastened area (560') of the connecting member (500') can also be inserted into the inside of the driving wheel (420'). In other words, when the liquid is injected into the reservoir (210'), the rod (410') and the connecting member (500') can be linearly moved to be inserted into the inside of the driving wheel (420').

[0240] At this time, at least a portion of the fastening block (441') and the trigger member (700') may be positioned in the second guide groove (561').

[0241] The drive wheel (420') may be rotatable along the R1 direction. For example, the drive wheel (420') may be rotatable independently of the trigger member (700').

[0242] Accordingly, the driving wheel (420') rotates along the R1 direction until the fastening block (441') is fully inserted into the trap home (563'). To put it another way, the driving wheel (420') can be said to be fastened to the connecting member (500') only after the liquid is injected into the reservoir (210') and then rotated by a certain angle.

[0243] For example, when the first connecting end (421') and the second connecting end (422') of the driving wheel (420') are formed in the form of gear teeth, the driving wheel (420') and the connecting member (500') can be connected only after the gear teeth are pressed (clicked) a predetermined number of times.

[0244] Figure 18 illustrates a state in which the driving wheel and the connecting member are connected.

[0245] Referring to FIG. 18, the driving wheel (420') can be rotated in the R1 direction of FIG. 17 to be connected to the connecting member (500').

[0246] However, even after the driving wheel (420') rotates until the fastening block (441') is fully inserted into the trap home (563'), the trigger member (700') may still be positioned in the first guide groove (551') of the connecting member (500'). Therefore, even if rotational power is transmitted to the connecting member (500') by the driving wheel (420'), at least a portion of the connecting member (500') (e.g., the step between the first part (510') and the second part (520')) is caught by the trigger member (700'), so that the driving wheel (420') and the connecting member (500') cannot rotate.

[0247] Figure 19 illustrates a state in which the constraint of the trigger member is released.

[0248] Referring to FIG. 19, the trigger member (700') can rotate along the R2 direction of FIG. 18.

[0249] As the trigger member (700') rotates in the R2 direction, the trigger member (700') finally comes out of the first guide groove (551') of the connecting member (500').

[0250] Accordingly, when the driving wheel (420') rotates, the connecting member (500') rotates together with the driving wheel (420') and can push the load (410') forward.

[0251] Specifically, after the driving wheel (420') and the connecting member (500') are fastened and the trigger member (700') is released from the first guide groove (551') of the connecting member (500'), the driving wheel (420') can rotate further. At this time, the rotation of the driving wheel (420') can be transmitted to the connecting member (500'). That is, after the driving wheel (420') and the connecting member (500') are fastened and the driving wheel (420') rotates further, the connecting member can also rotate together, and the rod (410') can move forward by the rotation of the connecting member.

[0252] Hereinafter, with reference again to FIGS. 13 to 19, a driving method of a drug injection device according to another embodiment of the present invention will be described.

[0253] Referring to FIGS. 13 to 19, a method for driving a liquid injection device (1') may include a step of mounting the liquid injection device on a target object, a step of rotating a needle assembly (100'), a step of applying pressure to a trigger member by the needle assembly to rotate the trigger member, and a step of transferring liquid from a reservoir to the needle assembly.

[0254] In the step of mounting a drug injection device on a target, the attachment part (6') of the drug injection device (1') is attached to the target. In addition, it can be connected to a remote device (2') in a wired or wireless communication environment.

[0255] In the step of rotating the needle assembly (100'), the needle assembly (100') is driven by the user. As described above, when the sleeve (110') of the needle assembly (100') is rotated for the first time by the user, the cannula and the needle (N) are inserted into the skin together, and when the sleeve (110') is rotated for the second time, only the needle (N) is pulled out from the skin. The first rotation of the sleeve (110') is for fixing the cannula to the skin using the needle (N), and the second rotation is for pulling out the needle (N) to inject the medication.

[0256] The step in which the needle assembly (100') applies force to the trigger member (700') and the trigger member (700') rotates occurs simultaneously with the rotation of the needle assembly (100'). When the needle assembly (100') rotates, the knob (101') applies force to the above-mentioned one end of the trigger member (700').

[0257] At this time, a step occurs in which the starter (750') applies force to the end of the drive shaft, causing the end of the drive shaft to move linearly. As the contact between the other end of the starter (750') and the trigger member (700') is released, the starter (750') can initiate the driving of the drive module (300'). As the starter (750') applies force to and passes through the end of the drive shaft, the end moves linearly along the axis. Thereafter, by repeatedly linearly moving the drive shaft of the drive module (300'), the driving force can be transmitted to the drive unit (400').

[0258] Afterwards, a step occurs in which the drive wheel (420') and the connecting member (500') are coupled to each other by the rotation of the drive wheel (420'), thereby coupling the load (410') and the drive wheel (420').

[0259] When the driving wheel (420') rotates, the fastening block (441') is caught in the trap home (563'), and at this time, the driving wheel (420') and the connecting member (500') can be coupled to each other.

[0260] In the step of transferring the chemical liquid from the reservoir unit (200') to the needle assembly (100'), an electrochemical reaction is generated in the drive module (300'), and the chemical liquid in the reservoir unit (200') can be transferred to the target object by repeated linear movement of the drive shaft of the drive module (300').

[0261] Hereinafter, a drive assembly according to another embodiment of the present invention will be described. In the following embodiments, details that are identical to the aforementioned embodiments or that can be easily modified and utilized by a person of ordinary skill in the art pertaining to the present invention will be omitted or briefly described for convenience of explanation.

[0262] Fig. 20 is a perspective view illustrating a drive assembly according to another embodiment of the present invention, Fig. 21 is an exploded perspective view of the drive assembly of Fig. 20, and Fig. 22 is a perspective view illustrating an outer shaft of Fig. 21. Figs. 23 to 25 are cross-sectional views illustrating a drive for storing a drug by injecting the drug into a reservoir through the drive assembly of Fig. 20 and discharging the drug through a needle.

[0263] Referring to FIGS. 20 to 22, the drive assembly (1600) may include a drive unit and a connecting member (1500).

[0264] The drive unit may be the same as the drive unit (400') described with reference to FIGS. 4 to 6 described above or the drive unit (400") described with reference to FIGS. 8 to 10. For convenience of explanation, the drive unit (400') described with reference to FIGS. 4 to 6 will be described below as an example. However, a person skilled in the art to which the present invention pertains can understand that the drive unit (400") described with reference to FIGS. 8 to 10 can be applied in the following embodiments.

[0265] The connecting member (1500) may include a nut (1501) and an outer shaft (1502). The nut (1501) and the outer shaft (1502) may be formed to be coupled to each other.

[0266] The nut (1501) may include a portion that extends in one direction. The extended portion of the nut (1501) may be inserted into a hole formed in the outer shaft (1502). That is, by inserting the extended portion of the nut (1501) into the outer shaft (1502), the nut (1501) and the outer shaft (1502) may be coupled.

[0267] The nut (1501) is coupled with the outer shaft (1502), so that when the outer shaft (1502) rotates, the nut (1501) can rotate together with the outer shaft (1502).

[0268] As an example, a connecting projection (1590) that is coupled with a nut (1501) may be formed on the outer shaft (1502). The connecting projection (1590) may be formed to protrude toward one side from the outer shaft (1502).

[0269] The nut (1501) may include a groove formed into which a connecting projection (1590) is inserted.

[0270] Accordingly, since the connecting projection (1590) is inserted into the groove of the nut (1501), when the outer shaft (1502) rotates, the nut (1501) can rotate integrally with the outer shaft (1502).

[0271] As an example, the nut (1501) may have threads formed on its inner surface. The threads formed on the inner surface of the nut (1501) may be screw-connected with the rod (410'). The outer shaft (1502) may have a through hole formed therein along its length. At this time, the inner surface of the outer shaft (1502) may not have threads formed thereon. Therefore, when the rod (410') is arranged to penetrate the through hole of the nut (1501) and the through hole of the outer shaft (1502), the rod (410') may be screw-connected only to the nut (1501) and not to the outer shaft (1502). That is, the rod (410') may be directly engaged only with the nut (1501).

[0272] Accordingly, when the outer shaft (1502) is engaged with the driving wheel (420') and rotates, the nut (1501) connected to the outer shaft (1502) can rotate together, and as the nut (1501) rotates, the rod (410') screw-connected to the nut (1501) can move forward.

[0273] The outer shaft (1502) may include a first portion (1510) and a second portion (1520).

[0274] The first part (1510) may refer to a part that is connected to the driving wheel (420'), and the second part (1520) may refer to a part that is not connected to the driving wheel (420').

[0275] A channel (1563) may be formed in the first portion (1510) along the longitudinal direction of the outer shaft (1502). The channel (1563) may be formed concavely from the outer surface of the outer shaft (1502) in a direction toward the center of rotation of the outer shaft (1502). Accordingly, the first portion (1510) may have a smaller diameter than the second portion (1520).

[0276] As an example, a plurality of channels (1563) may be formed along the circumferential direction of the outer shaft (1502). For example, a plurality of channels (1563) may be formed corresponding to the number of fastening portions (440') of the driving wheel (420').

[0277] A plurality of ribs (1562) may be formed along the longitudinal direction of the channel (1563). The ribs (1562) may be formed to protrude outward from the outer surface of the first portion (1510). In this case, the ribs (1562) may not protrude further than the second portion (1520).

[0278] The second part (1520) may not have a rib (1562) formed.

[0279] The first part (1510) can guide the movement path of the outer shaft (1502). Specifically, when the outer shaft (1502) is inserted into the inside of the driving wheel (420'), the fastening part (440') of the driving wheel (420') can be sequentially caught on a plurality of ribs (1562) formed in the channel (1563).

[0280] When the outer shaft (1502) is inserted into the inside of the driving wheel (420'), the outer shaft (1502) and the driving wheel (420') can be fastened. Specifically, when the outer shaft (1502) is inserted into the inside of the driving wheel (420'), at least a portion of the fastening portion (440') can remain inserted into the inside of the channel (1563). Therefore, when the driving wheel (420') rotates, the fastening portion (440') can transmit the driving force due to the rotation of the driving wheel (420') to the outer shaft (1502) while in contact with the side wall of the channel (1563), thereby allowing the outer shaft (1502) to rotate.

[0281] As an optional embodiment, the drive assembly (1600) may further include a spring member (1610).

[0282] The spring member (1610) may be arranged to surround the outer circumference of the outer shaft (1502). For example, the spring member (1610) may be arranged to surround the outer circumference of the outer shaft (1502) in front of the driving wheel (420').

[0283] The spring member (1610) can serve to fix the connecting member (1500) within a certain force range so that the connecting member (1500) is not pushed in an unintended direction.

[0284] The function of the spring member (1610) will be described in detail later.

[0285] Below, the relationship between the forces occurring in the step of injecting the drug into the reservoir (210') and the step of injecting the drug into the user's body is described.

[0286] In the specification below, when the liquid is injected into the reservoir (210'), the liquid is injected and pushes the plunger (230') backward, which pushes the connecting member (1500) backward. At this time, the force that the connecting member (1500) receives backward due to the injection of the liquid is defined as the filling force.

[0287] In addition, when the driving wheel (420') rotates and the load moves forward after the medicine is injected into the reservoir (210') and the medicine is injected into the user's body, a force may be generated that pushes the plunger (230') backward as the medicine is injected. In other words, a repulsive force may be generated due to the injection of the medicine. At this time, the repulsive force due to the injection of the medicine is defined as the injection repulsive force (push-back force).

[0288] In addition, when occlusion of the needle (N) or cannula occurs while the drug is being injected into the user's body, pressure that pushes out the drug may be generated within the reservoir, which may generate a force that pushes the connecting member (1500) backward. In other words, a back force due to the occlusion may be generated. At this time, the back force generated due to the occlusion is defined as the occlusion back force.

[0289] As an example, an embodiment that does not include a spring member (1610) is described.

[0290] In the filling step of the liquid, the filling force may be stronger than the force exerted by the fastening member (440') on the rib (1562). Therefore, the connecting member (1500) may be inserted into the inside of the driving wheel (420') while overcoming the force exerted by the fastening member (400') on the rib (1562).

[0291] At the stage where the medicine is injected into the user's body without causing occlusion, the injection push-back force may be less than the force exerted by the fastening member (440') on the rib (1562). Therefore, the connecting member (1500) may not be pushed back by the injection push-back force while the medicine is injected, and the medicine may be stably injected into the user's body.

[0292] At the stage where the drug is injected into the user's body while occlusion occurs, the sum of the injection push-back force and the occlusion force may be less than the force exerted by the fastening member (440') on the rib (1562). Accordingly, the connecting member (1500) may not be pushed back by the injection push-back force and the occlusion force while the drug is injected.

[0293] As another embodiment, an embodiment including a spring member (1610) is described.

[0294] In the filling step of the liquid, the filling force may be stronger than the sum of the force exerted by the fastening portion (440') on the rib (1562) and the force exerted by the spring member (1610) on the connecting member (1500). Accordingly, the connecting member (1500) may be inserted into the driving wheel (420') while overcoming both the force exerted by the fastening portion (400') on the rib (1562) and the force exerted by the spring member (1610) on the connecting member (1500).

[0295] At the stage where the medicine is injected into the user's body without causing occlusion, the injection push-back force may be less than the sum of the force exerted by the fastening portion (440') on the rib (1562) and the force exerted by the spring member (1610) on the connecting member (1500). Therefore, the connecting member (1500) may not be pushed back by the injection push-back force while the medicine is injected, and the medicine may be stably injected into the user's body.

[0296] At the stage where the drug is injected into the user's body while occlusion occurs, the sum of the injection push-back force and the occlusion push-back force may be less than the sum of the force applied by the fastening portion (440') to the rib (1562) and the force applied by the spring member (1610) to the connecting member (1500). Accordingly, the connecting member (1500) may not be pushed back by the injection push-back force and the occlusion push-back force while the drug is injected.

[0297] In order to satisfy the relationship between the forces described above, the driving assembly (1600) according to one embodiment of the present invention can adjust the height of the rib (1562), the material of the connecting member (1500), the material of the driving wheel (420'), the magnitude of the force for rotating the driving wheel (420'), etc.

[0298] In addition, in order to satisfy the relationship between the forces described above, the driving assembly (1600) according to another embodiment of the present invention can set the strength of the force with which the spring member (1610) holds the connecting member (1500).

[0299] Figure 23 shows the state before the drug is injected into the reservoir (210').

[0300] Referring to FIG. 23, it can be confirmed that the nut (1501) is connected to the outer shaft (1502). That is, the nut (1501) can be connected to the outer shaft (1502) before the liquid is filled into the reservoir (210'), and the connection between the nut (1501) and the outer shaft (1502) may not be separated thereafter.

[0301] When the liquid is filled into the reservoir (210'), the plunger (230') can move rearward (to the right in FIG. 23), thereby allowing the connecting member (1500) to be inserted into the inside of the driving wheel (420').

[0302] In this process, the fastening portion (440') of the driving wheel (420') can be sequentially caught on the rib (1562) formed in the channel (1563). To explain this from another perspective, the connecting member (1500) can be inserted into the inside of the driving wheel (420') by overcoming the force exerted on the fastening portion (440') by the rib (1562) due to the pressure of the liquid being filled.

[0303] Figure 24 illustrates a state in which the liquid is filled in the reservoir (210').

[0304] Referring to FIG. 24, the plunger (230') may be located at the rearmost end (rightmost end based on FIG. 24) of the reservoir (210').

[0305] At this time, the load (410') may be engaged with the nut (1501) and may not be engaged with the outer shaft (1502).

[0306] Figure 25 illustrates a state in which the liquid is discharged from the reservoir (210').

[0307] Referring to FIG. 25, the connecting member (1500) can rotate as the driving wheel (420') rotates. Specifically, when the driving wheel (420') rotates, the outer shaft (1502) can rotate, and as the outer shaft (1502) rotates, the nut (1501) can also rotate.

[0308] Since the nut (1501) is screw-connected to the load, the nut (1501) can move the load forward by rotation.

[0309] Hereinafter, a drive assembly according to another embodiment of the present invention will be described. In the following embodiments, details that are identical to the aforementioned embodiments or that can be easily modified and utilized by a person of ordinary skill in the art pertaining to the present invention will be omitted or briefly described for convenience of explanation.

[0310] FIG. 26 is a perspective view showing a drive assembly according to another embodiment of the present invention, FIG. 27 is an enlarged view of a Z portion of FIG. 26, and FIG. 28 is an exploded perspective view of the drive assembly of FIG. 26.

[0311] Referring to FIGS. 26 to 28, the drive assembly (2600) may include a drive unit and a connecting member (2500).

[0312] The drive unit may be the same as the drive unit (400') described with reference to FIGS. 4 to 6 described above or the drive unit (400") described with reference to FIGS. 8 to 10. For convenience of explanation, the drive unit (400') described with reference to FIGS. 4 to 6 will be described below as an example. However, a person skilled in the art to which the present invention pertains can understand that the drive unit (400") described with reference to FIGS. 8 to 10 can be applied in the following embodiments.

[0313] The connecting member (2500) may include a first portion (2510) and a second portion (2520).

[0314] The first part (2510) may refer to a part that is connected to the driving wheel (420'), and the second part (2520) may refer to a part that is not connected to the driving wheel (420').

[0315] A channel (2511) may be formed in the first portion (2510) along the longitudinal direction of the connecting member (2500). The channel (2511) may be formed concavely in a direction from the outer surface of the connecting member (2500) toward the center of rotation of the connecting member (2500). Accordingly, the first portion (2510) may have a smaller diameter than the second portion (2520).

[0316] As an example, a plurality of channels (2511) may be formed along the circumference of the connecting member (2500). For example, a plurality of channels (2511) may be formed corresponding to the number of fastening portions (440') of the driving wheel (420').

[0317] A plurality of ribs (2562) may be formed along the longitudinal direction of the channel (2511) of the first portion (2510). The ribs (2562) may be formed to protrude outward from the outer surface of the first portion (2510). In this case, the ribs (2562) may not protrude further than the second portion (2520).

[0318] The second part (2520) may not have a rib (2562) formed.

[0319] The first part (2510) can guide the movement path of the connecting member (2500).

[0320] Specifically, when the connecting member (2500) is inserted into the inside of the driving wheel (420'), the fastening portion (440') of the driving wheel (420') can be sequentially caught on a plurality of ribs (2562) formed in the channel (2511).

[0321] When the connecting member (2500) is inserted into the inside of the driving wheel (420'), the connecting member (2500) and the driving wheel (420') can be fastened. Specifically, when the connecting member (2500) is inserted into the inside of the driving wheel (420'), the protrusion (443') of the fastening portion (440') can be maintained in a state inserted into the inside of the channel (2511). Therefore, when the driving wheel (420') rotates, the protrusion (443') can transmit the driving force due to the rotation of the driving wheel (420') to the connecting member (2500) while in contact with the side wall of the channel (2511), thereby allowing the connecting member (2500) to rotate.

[0322] As an optional embodiment, the width of the protrusion (443') may correspond to the width of the channel (2511).

[0323] As an example, the channel (2511) may be formed linearly along the length of the connecting member (2500). This may mean that the connecting member (2500) and the driving wheel (420') are connected so that driving force can be transmitted even without a clutch mechanism.

[0324] When explaining the clutch mechanism, the clutch mechanism may mean a mechanism in which the driving force of the driving wheel (420') is transmitted to the connecting member (2500) by first engaging the connecting member (2500) and then clutching the driving wheel (420') to enable transmission of power. That is, referring to FIG. 3 and the like, when the driving wheel (420') rotates and the fastening block (441') is inserted into the trap groove (563') of the connecting member (500'), the driving wheel (420') and the connecting member (500') are connected (engaged), and only then can transmission of power be possible.

[0325] On the other hand, in the driving assembly (2600) according to the present embodiment, as the connecting member (2500) is inserted into the inside of the driving wheel (420'), the protrusion (443') is inserted into the inside of the channel (2511), so that the driving force of the driving wheel (420') can be transmitted to the connecting member (2500). That is, in the driving assembly (2600) according to the present embodiment, the driving force of the driving wheel (420') can be directly transmitted to the connecting member (2500) without relying on a clutch mechanism. In addition, this coupling of the driving wheel (420') and the connecting member (2500) can be maintained from the initial stage of filling the medicine to the stage of injecting the medicine to the user.

[0326] Below, the relationship between the forces generated in the step of injecting the drug into the reservoir (210') and the step of discharging the drug is described.

[0327] In the filling step of the liquid, the filling force may be stronger than the force exerted by the protrusion (443') on the rib (2562). Therefore, the connecting member (2500) may be inserted into the inside of the driving wheel (420') while overcoming the force exerted by the protrusion (443') on the rib (2562).

[0328] At the stage where the medicine is injected into the user's body without causing occlusion, the injection push-back force may be less than the force exerted by the fastening member (440') on the rib (2562). Therefore, the connecting member (2500) may not be pushed back by the injection push-back force while the medicine is injected, and the medicine may be stably injected into the user's body.

[0329] At the stage where the drug is injected into the user's body while occlusion occurs, the sum of the injection push-back force and the occlusion force may be less than the force exerted by the fastening member (440') on the rib (2562). Accordingly, the connecting member (2500) may not be pushed back by the injection push-back force and the occlusion force while the drug is injected.

[0330] In order to satisfy the relationship between the forces described above, the driving assembly (2600) according to one embodiment of the present invention can adjust the height of the rib (2562), the material of the connecting member (2500), the material of the driving wheel (420'), the magnitude of the force for rotating the driving wheel (420'), etc.

[0331] Hereinafter, various embodiments of a drive assembly according to the present invention will be described. In the embodiments below, the drive assembly may further include a grip member arranged to surround at least a portion of the outer surface of the connecting member.

[0332] The grip member may be a member that grips the connecting member by being arranged to surround at least a portion of the outer surface of the connecting member.

[0333] A grip member can grip a connecting member and secure the connecting member within a certain force range. For example, the grip member can be designed so that the force it grips the connecting member falls within a certain range to satisfy the relationship between the forces described above.

[0334] Fig. 29 is a perspective view showing a modified example of the drive assembly of Fig. 26, and Fig. 30 is an exploded perspective view of the drive assembly of Fig. 29.

[0335] Referring to FIGS. 29 and 30, the drive assembly (2600') may further include a spring member (2610').

[0336] The spring member (2610') may be arranged to surround the outer surface of the connecting member (2500'). For example, the spring member (2610') may be arranged to surround the outer surface of the connecting member (2500') in front of the driving wheel (420').

[0337] The spring member (2610') can play a role in fixing the connecting member (2500') within a certain force range to prevent the connecting member (2500') from being pushed in an unintended direction.

[0338] Below, the relationship between the forces generated in the step of injecting the drug into the reservoir (210') and the step of discharging the drug is described.

[0339] In the filling step of the liquid, the filling force may be stronger than the sum of the force exerted by the protrusion (443') on the rib (2562') and the force exerted by the spring member (2610') on the connecting member (2500'). Accordingly, the connecting member (2500') may be inserted into the driving wheel (420') while overcoming both the force exerted by the protrusion (443') on the rib (2562') and the force exerted by the spring member (2610') on the connecting member (2500').

[0340] At the stage where the medicine is injected into the user's body without causing occlusion, the injection push-back force may be less than the sum of the force exerted by the protrusion (443') on the rib (2562') and the force exerted by the spring member (2610') on the connecting member (2500'). Therefore, the connecting member (2500') may not be pushed back by the injection push-back force while the medicine is injected, and the medicine may be stably injected into the user's body.

[0341] At the stage where the drug is injected into the user's body while occlusion occurs, the sum of the injection push-back force and the occlusion push-back force may be less than the sum of the force applied by the protrusion (440') to the rib (2562') and the force applied by the spring member (2610') to the connecting member (2500'). Accordingly, the connecting member (2500') may not be pushed back by the injection push-back force and the occlusion push-back force while the drug is injected.

[0342] In order to satisfy the relationship between the forces described above, the driving assembly (2600') according to one embodiment of the present invention can adjust the height of the rib (2562'), the material of the connecting member (2500'), the material of the driving wheel (420'), and the magnitude of the force for rotating the driving wheel (420').

[0343] In addition, in order to satisfy the relationship between the forces described above, the driving assembly (2600') according to another embodiment of the present invention can set the strength of the force with which the spring member (2610') holds the connecting member (2500').

[0344] As one embodiment, the spring member (2610') may be kept in constant contact with the drive wheel (420').

[0345] To be more specific about this, the spring member (2610') can be maintained in contact with the driving wheel (420') from the stage before the reservoir unit (200') is filled with the drug. In addition, the spring member (2610') can be maintained in contact with the driving wheel (420') while the drug is being filled into the reservoir unit (200') and while the drug is being injected into the user's body.

[0346] Here, the spring member (2610') may be in contact with at least a portion of the first connecting end (421') of the driving wheel (420') and may be in contact with at least a portion of the fastening portion (440').

[0347] Since the spring member (2610') is maintained in contact with the driving wheel (420'), the spring member (2610') and the driving wheel (420') may not rotate relative to each other. For example, when the driving wheel (420') rotates, the spring member (2610') may rotate simultaneously while being connected to the driving wheel (420'). To explain this from another perspective, when the driving wheel (420') rotates after the liquid is filled, it can be said that no frictional force due to rotation occurs between the spring member (2610') and the driving wheel (420').

[0348] Hereinafter, a drive assembly according to another embodiment of the present invention will be described. In the following embodiments, details that are identical to the aforementioned embodiments or that can be easily modified and utilized by a person of ordinary skill in the art pertaining to the present invention will be omitted or briefly described for convenience of explanation.

[0349] FIG. 31 is a perspective view showing a drive assembly (3600) according to another embodiment of the present invention, FIG. 32 is an enlarged view of a U portion of FIG. 31, and FIG. 33 is an exploded perspective view of the drive assembly (3600) of FIG. 31.

[0350] Referring to FIGS. 31 to 33, the drive assembly (3600) may include a drive unit and a connecting member (3500).

[0351] The drive unit may be the same as the drive unit (400') described with reference to FIGS. 4 to 6 described above or the drive unit (400") described with reference to FIGS. 8 to 10. For convenience of explanation, the drive unit (400') described with reference to FIGS. 4 to 6 will be described below as an example. However, a person skilled in the art to which the present invention pertains can understand that the drive unit (400") described with reference to FIGS. 8 to 10 can be applied in the following embodiments.

[0352] The connecting member (3500) may include a first portion (3510). The first portion (3510) may include a channel (3511) that is formed concavely from an outer surface of the connecting member (3500) in a direction toward the center of rotation of the connecting member (3500).

[0353] The channel (3511) can be formed along the length direction of the connecting member (3500).

[0354] As an example, a plurality of channels (3511) may be formed along the circumference of the connecting member (3500). For example, a plurality of channels (3511) may be formed corresponding to the number of fastening portions (440') of the driving wheel (420').

[0355] The channel (3511) of the first portion (3510) may be formed in the form of a groove with an empty interior. For example, compared to the previously described embodiments, the channel (3511) according to the present embodiment may not have ribs formed therein. Accordingly, when the connecting member (3500) is inserted into the driving wheel (420'), the fastening portion (440') of the driving wheel (420') can slide within the channel (3511) without any obstruction.

[0356] When the connecting member (3500) is inserted into the inside of the driving wheel (420'), at least a portion of the fastening member (440') can remain inserted into the inside of the channel (3511). For example, the protrusion (443') of the driving wheel (420') can be inserted into the inside of the channel (3511). Therefore, when the driving wheel (420') rotates, the protrusion (443') can transmit the driving force due to the rotation of the driving wheel (420') to the connecting member (3500) while in contact with the side wall of the channel (3511), thereby allowing the connecting member (3500) to rotate.

[0357] As an optional embodiment, the width of the protrusion (443') may correspond to the width of the channel (3511).

[0358] The channel (3511) can be formed linearly along the length of the connecting member (3500). Therefore,

[0359] The connecting member (3500) and the driving wheel (420') can be connected so that driving force can be transmitted even without the clutch mechanism described above.

[0360] The drive assembly (3600) may further include a spring member (3610).

[0361] The spring member (3610) may be arranged to surround the outer surface of the connecting member (3500). For example, the spring member (3610) may be arranged to surround the outer surface of the connecting member (3500) in front of the driving wheel (420').

[0362] The spring member (3610) can play a role in fixing the connecting member (3500) within a certain force range so that the connecting member (3500) is not pushed in an unintended direction.

[0363] Below, the relationship between the forces generated in the step of injecting the drug into the reservoir (210') and the step of discharging the drug is described.

[0364] In the filling step of the liquid, the filling force may be stronger than the force with which the spring member (3610) holds the connecting member (3500). Therefore, the connecting member (3500) may be inserted into the inside of the driving wheel (420') while overcoming the force with which the spring member (3610) holds the connecting member (3500).

[0365] At the stage where the medicine is injected into the user's body without causing occlusion, the injection push-back force may be smaller than the force with which the spring member (3610) holds the connecting member (3500). Therefore, the connecting member (3500) may not be pushed back by the injection push-back force while the medicine is injected, and the medicine may be stably injected into the user's body.

[0366] At the stage where the drug is injected into the user's body while occlusion occurs, the sum of the injection push-back force and the occlusion force may be less than the force with which the spring member (3610) holds the connecting member (3500). Therefore, the connecting member (3500) may not be pushed back by the injection push-back force and the occlusion force while the drug is injected.

[0367] In order to satisfy the relationship between the forces described above, the driving assembly (3600) according to one embodiment of the present invention can set the magnitude of the force for rotating the driving wheel (420') and the strength of the force for the spring member (3610) to hold the connecting member (3500).

[0368] As one embodiment, the spring member (3610) may be maintained in constant contact with the drive wheel (420').

[0369] To be more specific about this, the spring member (3610) can be maintained in contact with the driving wheel (420') from the stage before the reservoir unit (200') is filled with the drug. In addition, the spring member (3610) can be maintained in contact with the driving wheel (420') while the drug is being filled into the reservoir unit (200') and while the drug is being injected into the user's body.

[0370] Here, the spring member (3610) may be in contact with at least a portion of the first connecting end (421') of the driving wheel (420') and may be in contact with at least a portion of the fastening portion (440').

[0371] Since the spring member (3610) is maintained in contact with the driving wheel (420'), the spring member (3610) and the driving wheel (420') may not rotate relative to each other. For example, when the driving wheel (420') rotates, the spring member (3610) may rotate simultaneously while being connected to the driving wheel (420'). To explain this from another perspective, when the driving wheel (420') rotates after the liquid is filled, it can be said that no frictional force due to rotation occurs between the spring member (3610) and the driving wheel (420').

[0372] As an optional embodiment, the connecting member (3500) may include a nut (3051) and an outer shaft (3502). The nut (3501) and the outer shaft (3502) may be formed to be engageable with each other.

[0373] Here, the nut (3501) and the outer shaft (3502) are the same as those described with reference to FIGS. 20 to 22, and thus, a detailed description thereof will be omitted.

[0374] Hereinafter, a reservoir unit according to another embodiment of the present invention will be described. In the following embodiments, details that are identical to the aforementioned embodiments or that can be easily modified and utilized by a person of ordinary skill in the art pertaining to the present invention will be omitted or briefly described for convenience of explanation.

[0375] FIG. 34 is a perspective view illustrating a reservoir unit according to another embodiment of the present invention, FIG. 35 is an exploded perspective view of the reservoir unit of FIG. 34, and FIG. 36 is a perspective cross-sectional view for explaining the connection structure of the reservoir unit and the drive unit of FIG. 34.

[0376] Referring to FIGS. 34 to 36, the reservoir unit (1200) may include a reservoir (1210) and a reservoir cap (1250).

[0377] The reservoir (1210) is extended to a preset length in the longitudinal direction and can store a drug solution in its internal space. The drug solution stored in the internal space of the reservoir (1210) can be discharged through a needle by the movement of the plunger.

[0378] A reservoir cap (1250) may be mounted on an end of the reservoir (1210). For example, a reservoir cap (1250) may be mounted on an end of the reservoir (1210) on the side to which the drive unit (400') is connected.

[0379] A drive unit (400') may be arranged on one side of the reservoir unit (1200). For example, a drive wheel (420') of the reservoir unit (1200) may be arranged on one side of the reservoir unit (1200), and at least a portion of the connecting member (1500) may be inserted into the inside of the reservoir (1210).

[0380] An opening (1251) may be formed in the reservoir cap (1250). At least a portion of the load (410') and / or the connecting member (1500) may be inserted and moved through the opening (1251) formed in the reservoir cap (1250).

[0381] The reservoir cap (1250) may have an internal space. For example, the reservoir cap (1250) may have an internal space extending from where the reservoir (1210) is located to the side where the drive unit (400') is connected.

[0382] A spring member (1610) may be placed in a space provided in the reservoir cap (1250). At this time, the space provided in the reservoir cap (1250) may be formed to have a shape and volume corresponding to the spring member (1610) so that the spring member (1610) can be inserted therein. In addition, the end of the reservoir cap (1250) may be formed so that the spring member (1610) does not fall outward. Therefore, when the spring member (1610) is placed inside the reservoir cap (1250), the spring member (1610) may not fall outward from the reservoir cap (1250) while the drug injection device according to the present invention is operating.

[0383] As an example, the spring member (1610) may be maintained in contact with one surface of the reservoir cap (1250). That is, with reference to FIG. 36, the spring member (1610) may be maintained in contact with the rearmost end (the portion closer to the drive wheel (420')) of the reservoir cap (1250).

[0384] To explain this more specifically, the spring member (1610) can be maintained in contact with one surface of the reservoir cap (1250) from the stage before the reservoir unit (1200) is filled with the drug. In addition, the spring member (1610) can be maintained in contact with one surface of the reservoir cap (1250) while the drug is filled in the reservoir unit (1200) and while the drug is injected into the user's body.

[0385] Accordingly, a portion of the reservoir cap (1250) may be placed between the spring member (1610) and the driving wheel (420'). That is, the spring member (1610) and the driving wheel (420') may not be in direct contact with each other due to the reservoir cap (1250).

[0386] Hereinafter, a drive assembly according to another embodiment of the present invention will be described. In the following embodiments, details that are identical to the aforementioned embodiments or that can be easily modified and utilized by a person of ordinary skill in the art pertaining to the present invention will be omitted or briefly described for convenience of explanation.

[0387] FIG. 37 is a perspective view showing a drive assembly according to another embodiment of the present invention, FIG. 38 is an enlarged view of a portion V of FIG. 37, and FIG. 39 is an exploded perspective view of the drive assembly of FIG. 37.

[0388] Referring to FIGS. 37 to 39, the drive assembly may include a drive unit and a connecting member.

[0389] The drive unit may be the same as the drive unit (400') described with reference to FIGS. 4 to 6 described above or the drive unit (400") described with reference to FIGS. 8 to 10. For convenience of explanation, the drive unit (400') described with reference to FIGS. 4 to 6 will be described below as an example. However, a person skilled in the art to which the present invention pertains can understand that the drive unit (400") described with reference to FIGS. 8 to 10 can be applied in the following embodiments.

[0390] The connecting member (4500) may include a first portion (4510). The first portion (4510) may include a channel (4511) that is formed concavely from an outer surface of the connecting member (4500) in a direction toward the center of rotation of the connecting member (4500).

[0391] The channel (4511) can be formed along the length of the connecting member (4500).

[0392] As an example, a plurality of channels (4511) may be formed along the circumference of the connecting member (4500). For example, a plurality of channels (4511) may be formed corresponding to the number of fastening portions (440') of the driving wheel (420').

[0393] The channel (4511) of the first portion (4510) may be formed in the form of a groove with an empty interior. For example, compared to the previously described embodiments, the channel (4511) according to the present embodiment may not have ribs formed therein. Accordingly, when the connecting member (4500) is inserted into the driving wheel (420'), the fastening portion (440') of the driving wheel (420') can slide within the channel (4511) without any obstruction.

[0394] When the connecting member (4500) is inserted into the inside of the driving wheel (420'), at least a portion of the fastening member (440') can remain inserted into the inside of the channel (4511). For example, the protrusion (443') of the driving wheel (420') can be inserted into the inside of the channel (4511). Therefore, when the driving wheel (420') rotates, the protrusion (443') can transmit the driving force due to the rotation of the driving wheel (420') to the connecting member (4500) while in contact with the side wall of the channel (4511), thereby allowing the connecting member (4500) to rotate.

[0395] As an optional embodiment, the width of the protrusion (443') may correspond to the width of the channel (4511).

[0396] The channel (4511) can be formed linearly along the length of the connecting member (4500). Therefore,

[0397] The connecting member (4500) and the driving wheel (420') can be connected so that driving force can be transmitted even without the clutch mechanism described above.

[0398] The drive assembly (4600) may further include a ring member (4610).

[0399] The ring member (4610) may be arranged to surround at least a portion of the outer surface of the connecting member (4500). For example, the ring member (4610) may be arranged to surround the outer surface of the connecting member (4500) in front of the driving wheel (420').

[0400] The ring member (4610) can serve to fix the connecting member (4500) within a certain range of force to prevent the connecting member (4500) from being pushed in an unintended direction.

[0401] As an example, the ring member (4610) may have the shape of a snap ring or a C-ring. For example, the ring member (4610) may be formed in a roughly circular ring shape so as to surround at least a portion of the outer circumferential surface of the connecting member (4500). As another example, the ring member (4610) may be formed in a circular ring shape, but may be formed in a form in which at least one area is open.

[0402] Below, the relationship between the forces generated in the step of injecting the drug into the reservoir (210') and the step of discharging the drug is described.

[0403] In the filling step of the liquid, the filling force may be stronger than the force with which the ring member (4610) holds the connecting member (4500). Therefore, the connecting member (4500) may be inserted into the inside of the driving wheel (420') while overcoming the force with which the ring member (4610) holds the connecting member (4500).

[0404] At the stage where the medicine is injected into the user's body without causing occlusion, the injection push-back force may be smaller than the force with which the ring member (4610) holds the connecting member (4500). Therefore, the connecting member (4500) may not be pushed back by the injection push-back force while the medicine is injected, and the medicine may be stably injected into the user's body.

[0405] At the stage where the drug is injected into the user's body while occlusion occurs, the sum of the injection push-back force and the occlusion force may be less than the force with which the ring member (4610) holds the connecting member (4500). Therefore, the connecting member (4500) may not be pushed back by the injection push-back force and the occlusion force while the drug is injected.

[0406] In order to satisfy the relationship between the forces described above, the driving assembly (4600) according to one embodiment of the present invention can set the magnitude of the force for rotating the driving wheel (420') and the strength of the force for the ring member (4610) to hold the connecting member (4500).

[0407] As an example, the ring member (4610) may be maintained in constant contact with the drive wheel (420').

[0408] To be more specific about this, the ring member (4610) can be maintained in contact with the driving wheel (420') from the stage before the reservoir unit (200') is filled with the drug. In addition, the ring member (4610) can be maintained in contact with the driving wheel (420') while the drug is being filled into the reservoir unit (200') and while the drug is being injected into the user's body.

[0409] Here, the ring member (4610) may be in contact with at least a portion of the first connecting end (421') of the driving wheel (420') and may be in contact with at least a portion of the fastening portion (440').

[0410] Since the ring member (4610) is maintained in contact with the driving wheel (420'), the ring member (4610) and the driving wheel (420') may not rotate relative to each other. For example, when the driving wheel (420') rotates, the ring member (4610) may rotate simultaneously while being connected to the driving wheel (420'). To explain this from another perspective, when the driving wheel (420') rotates after the liquid is filled, it can be said that no frictional force due to rotation occurs between the ring member (4610) and the driving wheel (420').

[0411] As an optional embodiment, the connecting member (4500) may include a nut (4051) and an outer shaft (4502). The nut (4501) and the outer shaft (4502) may be formed to be engageable with each other.

[0412] Here, the nut (4501) and the outer shaft (4502) are the same as those described with reference to FIGS. 20 to 22, and thus, a detailed description thereof will be omitted.

[0413] While various embodiments of the present invention have been described above, these embodiments are not independent or exclusive. For example, some of the components of the various embodiments described above may be combined and implemented as needed, and embodiments derived from such combinations of components also fall within the scope of the present invention.

[0414] In addition, the spirit 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 considered to fall within the scope of the spirit of the present invention.

[0415] [Explanation of symbols]

[0416] 10: Liquid injection device

[0417] 100: Needle assembly

[0418] 200: Reservoir Unit

[0419] 300: Drive module

[0420] 400: Drive unit

[0421] 500: Absence of connection

[0422] 600: Drive Assembly

[0423] 700: Absence of trigger

[0424] 800: Battery

Claims

A needle assembly for injecting a medication into the user's body; A reservoir unit fluidly connected to the needle assembly and having a plunger therein; A drive unit including a rod connected to the plunger and moving along the reservoir unit and a drive wheel connected to the rod and transmitting driving force to the rod; A connecting member connected to one side of the driving wheel and rotating together with the rotation of the driving wheel; and A liquid injection device, comprising a grip member arranged to surround at least a portion of an outer surface of the connecting member. In the first paragraph, The above driving wheel is, A liquid injection device comprising at least one fastening portion formed to protrude in a direction toward the connecting member. In the second paragraph, The above fastening part is, A liquid injection device formed so that a plurality of the devices are spaced apart along the circumference of the above connecting member. In the first paragraph, The above grip member is, A liquid injection device, which is a spring member formed to surround at least a portion of the circumference of the above connecting member. In the first paragraph, The above grip member is, A liquid injection device, which is a ring member formed to surround at least a portion of the periphery of the above connecting member and has at least one area open. In the first paragraph, The above grip member is, A liquid injection device arranged to be in contact with the above driving wheel. In the first paragraph, The above grip member is, A liquid injection device that rotates simultaneously with the above driving wheel, but does not rotate relatively. In the first paragraph, The above reservoir unit, A reservoir having an internal space for storing the liquid; and including a reservoir cap mounted on one side of the reservoir; The above reservoir cap is, A liquid injection device in which a space is provided to accommodate the above grip member. In paragraph 8, The above grip member is, A liquid injection device arranged to be in contact with one surface of the reservoir cap.

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