KR20230055464A - Apparatus for Infusing medical liquid and control method thereof - Google Patents

Abstract

The present invention relates to an apparatus for infusing a medical liquid and a control method thereof, wherein the apparatus for infusing the medical liquid according to the present invention includes a storage device, a plunger, a holder, a rotating member, an actuator, and a gear assembly. According to the present invention, there is an advantage that the medical liquid can be easily injected into a storage device even with a simple structure, and the medical liquid can be discharged very accurately and consistently.

Description

Chemical liquid injection device and its control method {Apparatus for Infusing medical liquid and control method thereof}

The present invention relates to a chemical solution injection device and a control method thereof, and more particularly, to a chemical solution injection device including a holder and a control method thereof.

In general, a liquid injection device is used to inject a drug such as insulin into a patient's body. The drug solution injection device is manufactured to be attached to the patient's body and inject the drug into the patient's body while repeating a predetermined cycle for a predetermined time.

Since the drug is administered to the inside of the body, it is very important to keep the dose or usage of the drug accurately. For this reason, the liquid medicine storage device must discharge the liquid medicine to the patient in a very precise and minute amount, and the backflow must not occur during the discharge process. In addition, since the drug injection device is attached to the patient's body, it must have high durability so as to be sufficiently protected from the patient's movement or external impact.

In order to use the chemical solution injection device, the chemical solution must be injected into the chemical solution injection device. An actuator and a gear member for driving the device are disposed inside the drug injection device. In the case of the gear member, rotation is possible when the chemical solution is discharged to the outside, but rotation is very difficult when the chemical solution is injected into the device. Therefore, a complicated configuration such as a clutch had to be disposed in the conventional chemical injection device. However, when a configuration such as a clutch is disposed, there is a problem in that the size, weight, and production cost of the liquid chemical storage device unnecessarily increase.

US published patent 20170128664

An object to be solved by the present invention is to provide a chemical solution injection device capable of easily injecting a chemical solution even with a simple structure.

Another object of the present invention is to provide a chemical solution injection device that minimizes size, weight and production cost by simplifying the internal structure.

Another object of the present invention is to provide a chemical solution injection device and a control method capable of discharging a chemical solution in a very accurate and constant manner in a minute amount.

The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

The internal structure of the chemical storage device according to an embodiment of the present invention includes a storage device, a plunger, a holder, a rotating member, an actuator, and a gear assembly. The storage device has a chemical storage space formed therein so that the chemical solution can be stored. The plunger is movably disposed in the chemical storage space and includes a rod having a male thread. A rod can be inserted into the holder, and a female thread corresponding to the male thread is formed. One end of the rotating member is rotatably disposed in the storage device, and a holder may be inserted therein. The gear assembly rotates the rotating member. The actuator includes a main driving device that generates a driving force, and a first sub driving device that is spaced apart from the main driving device and provides a driving force to the gear assembly. The holder and the rotating member do not rotate relative to each other.

In addition, the shape of the cross section of the holder is not circular, and the holder may be inserted into the rotating member to be engaged.

In addition, a fixing protrusion may be formed in the holder, and a fixing groove into which the fixing protrusion is inserted may be formed in the rotating member.

In addition, the gear assembly receives driving force directly from the actuator, is fixedly disposed at the other end of the main gear member including a hook and the rotating member, receives the driving force from the main gear member to rotate the rotating member, and has teeth formed as a follower A gear member may be included.

In addition, the main gear member may include a first hook engaged with the teeth formed on the upper side of the driven gear member and a second hook engaged with the teeth formed on the lower side of the driven gear member and vertically symmetrical with the first hook. there is.

In addition, the teeth protrude outward in the radial direction of the driven gear member, and may be provided with a plurality of teeth, each inclined along one direction.

In addition, the main driving device may be an electroosmotic pump that generates a driving force according to the movement of the fluid stored therein.

It may further include a first tube connecting the electroosmotic pump and the first sub-driver, wherein at least a part of the first sub-driver protrudes to the outside and is capable of reciprocating in a vertical direction with respect to the bottom surface. The block may be included, and the fluid inside the electroosmotic pump may be introduced into the first sub-drive device through the first tube to move the first moving block.

In addition, the actuator may further include a second sub driving device spaced apart from the main driving device and providing a driving force to the gear assembly.

A chemical storage device according to an embodiment of the present invention includes a storage device, a plunger, a holder, a rotating member, an actuator, a gear assembly, and a housing. The storage device has a chemical storage space formed therein so that the chemical solution can be stored. The plunger is movably disposed in the chemical storage space and includes a rod having a male thread. A rod can be inserted into the holder, and a female thread corresponding to the male thread is formed. One end of the rotating member is rotatably disposed in the storage device, and a holder may be inserted therein. The gear assembly rotates the rotating member. The actuator includes a main driving device that generates a driving force, and a first sub driving device that is spaced apart from the main driving device and provides a driving force to the gear assembly. The housing forms an outer shape, and a storage device, a plunger, a holder, a rotating member, an actuator, and a gear assembly are disposed therein. The holder and the rotating member do not rotate relative to each other.

In addition, the shape of the cross section of the holder is not circular, and the holder may be inserted into the rotating member to be engaged.

In addition, a fixing protrusion may be formed in the holder, and a fixing groove into which the fixing protrusion is inserted may be formed in the rotating member.

In addition, the gear assembly receives driving force directly from the actuator, is fixedly disposed at the other end of the main gear member including a hook and the rotating member, receives the driving force from the main gear member to rotate the rotating member, and has teeth formed as a follower A gear member may be included.

In addition, the main gear member may include a first hook engaged with the teeth formed on the upper side of the driven gear member and a second hook engaged with the teeth formed on the lower side of the driven gear member and vertically symmetrical with the first hook. there is.

In addition, the teeth protrude outward in the radial direction of the driven gear member, and may be provided with a plurality of teeth, each inclined along one direction.

In addition, the main driving device may be an electroosmotic pump that generates a driving force according to the movement of the fluid stored therein.

It may further include a first tube connecting the electroosmotic pump and the first sub-driver, wherein at least a part of the first sub-driver protrudes to the outside and is capable of reciprocating in a vertical direction with respect to the bottom surface. The block may be included, and the fluid inside the electroosmotic pump may be introduced into the first sub-drive device through the first tube to move the first moving block.

In addition, the actuator may further include a second sub driving device spaced apart from the main driving device and providing a driving force to the gear assembly.

A method for controlling a chemical storage device according to an embodiment of the present invention includes: a storage device having a chemical storage space therein to store a chemical solution; and a plunger including a rod movably disposed in the chemical storage space and having a male thread. , A rod into which a rod can be inserted, one end of a holder in which a female thread corresponding to a male thread is formed is rotatably disposed in a storage device, a rotating member into which the holder can be inserted, a gear assembly that rotates the rotating member, and a driving force to form A chemical liquid injection device including an actuator including a main driving device and a first sub driving device spaced apart from the main driving device and providing driving force to a gear assembly, wherein the holder and the rotating member do not rotate relative to each other, (a) Steps, (b) and (c) are included. Step (a) is a step of rotating the rotating member in a first rotational direction for a first time. Step (b) is a step in which the gear assembly stops for the second time. Step (c) is a step in which the rotating member stops for the third time. While steps (a), (b) and (c) are sequentially repeated for a predetermined time, the rotating member is controlled to rotate in the first rotation direction by one tooth.

In addition, the chemical liquid injection device includes two storage devices, plungers, holders, rotating members, and two gear assemblies, and the actuator further includes a second sub-drive device that is spaced apart from the main drive device and provides driving force to the gear assembly, , The first sub-drive device and the second sub-drive device provide driving force to the two gear assemblies, respectively, and each of the first sub-drive device and the second sub-drive device (a), (b), and (c) ) step can be repeated.

According to the chemical liquid injection device and its control method of the present invention, one or more of the following effects are provided.

First, the present invention has the advantage that a holder and a rotating member are provided, and the holder and the rotating member can be rotated in engagement with each other, so that a chemical solution can be easily injected with a simple structure.

Second, the present invention also has the advantage of minimizing the size, weight and production cost of the product, including a holder, a rotating member, and a gear assembly having a simple and efficient structure.

Third, the present invention also has the advantage of being able to discharge the chemical solution in a very precise and constant manner in a minute amount because it can be provided with an electroosmotic pump together with the gear assembly.

The effect of the present invention is not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view showing the overall appearance of a chemical liquid injection device and a control method according to an embodiment of the present invention.
2 is an exploded perspective view showing the appearance of a rotating member, a holder and a plunger.
FIG. 3 compares and shows the positions of the plunger and the holder when the chemical solution is injected into the storage device or the chemical solution is discharged from the storage device.
4 shows a holder having a polygonal cross section and a holder insertion hole corresponding thereto.
5 shows a holder having a fixing protrusion and a holder insertion hole having a fixing groove corresponding thereto.
6 shows how the plunger moves inside the storage device by the gear assembly.
7 shows a view from above of the rotating member, the gear assembly, and the actuator.
8 shows a state in which a driven gear member having teeth is rotated by a main gear member having hooks.
9 is an enlarged view of the actuator separately.
10 is an enlarged view of an actuator including a first sub-driving device and a second sub-driving device.
11 is a conceptual diagram illustrating a connection relationship between an actuator, a controller, and a timer.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

Hereinafter, a chemical solution injection device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing the overall appearance of a chemical solution injection device and its control method according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the appearance of a rotating member, a holder and a plunger, and FIG. 3 is a chemical solution in a storage device The positions of the plunger and the holder when the liquid is injected or discharged from the storage device are respectively compared and shown.

Hereinafter, a chemical liquid injection device 1000 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

The chemical liquid injection device 1000 according to an embodiment of the present invention includes a housing 100, a storage device 200, a plunger 300, a holder 400, a rotating member 500, an actuator 600, a gear assembly ( 700), and a control unit 800.

The housing 100 forms the overall outer appearance of the chemical solution injection device 1000. In FIG. 1 , the outer shape of the housing 100 is shown to be substantially hexahedral, but the shape of the housing 100 is not limited thereto. The housing 100 includes a base 110 and an upper case 120 . The upper case 120 is disposed above the base 110. An internal space is formed between the base 110 and the upper case 120 . In the inner space between the base 110 and the upper case 120, the storage device 200, the plunger 300, the holder 400, the rotating member 500, the actuator 600, the gear assembly 700, the controller ( 800) and the like are disposed.

The storage device 200 may store the liquid medicine L. Inside the storage device 200, a chemical storage space 210 for storing the chemical solution L is formed. The storage device 200 is formed with an inlet 220 and a discharge port 230 communicating the external and chemical storage space 210 . The chemical solution L may be injected into the chemical storage space 210 from the outside through the injection port 220, and the chemical solution L may be discharged from the chemical storage space 210 to the outside through the discharge port 230. The inlet 220 and the outlet 230 may be disposed close to each other on either side of the storage device 200 .

The plunger 300 is a component for pushing the chemical solution L stored in the chemical storage space 210 of the storage device 200 . The plunger 300 is movably disposed in the chemical storage space 210 . The plunger 300 may include a head 310 and a rod 320 . The head 310 may be movably disposed inside the chemical storage space 210 in a state in which the circumferential portion is in close contact with the inner wall of the storage device 200 . The rod 320 may be disposed on one side of the head 310 and may be formed to extend in a direction away from the inlet 220 or the outlet 230 . The rod 320 may be formed to extend from one side of the head 310 in a direction away from the inlet 220 or the outlet 230 . A male screw thread 321 may be formed on an outer circumferential surface of the rod 320 . That is, the rod 320 may be formed in a bolt-like structure.

The rod 320 of the plunger 300 may be inserted into the holder 400 . A rod insertion hole 410 into which the rod 320 is inserted may be formed in the holder 400 . A female thread 411 corresponding to the male thread 321 of the rod 320 may be formed in the rod insertion hole 410 . The rod 320 and the holder 400 may rotate relative to each other. When the rod 320 and the holder 400 rotate relative to each other, the rod 320 may be pulled into or pulled out of the holder 400 . When the rod 320 is fixed to the plunger 300, the rod 320 may be inserted into the holder 400 or taken out of the holder 400 according to rotation of the holder 400.

Rotating member 500 may be formed in a cylindrical shape. The rotating member 500 may be rotatably disposed in the storage device 200 . At this time, in the storage device 200, the rotating member 500 may be disposed far from the inlet 220 and the outlet 230. A hole (not shown) corresponding to an end surface of the rotating member 500 may be formed in the storage device 200 so that the rotating member 500 may be disposed therein. The rotating member 500 may be inserted into and coupled to a hole (not shown) of the storage device 200 .

The holder 400 may be inserted into the rotating member 500 . A holder insertion hole 510 into which the holder 400 is inserted may be formed in the rotating member 500 . A cross section of the holder insertion hole 510 may be formed to correspond to a cross section of the holder 400 . The holder 400 may be introduced into the holder insertion hole 510 of the rotating member 500 . The holder 400 is arranged so as not to rotate relative to the rotating member 500 . Specifically, when the holder 400 is inserted into the holder insertion hole 510, the holder 400 is disposed to be engaged with the holder insertion hole 510, and thus, the holder 400 is removed from the holder insertion hole 510. It can be drawn in or out, but it can be arranged so as not to rotate relative to the holder insertion hole 510 .

The actuator 600 is a component that provides a driving force. The actuator 600 may provide a driving force that acts linearly and reciprocally. The actuator 600 may be configured such as a pump or a motor that provides driving force, and may preferably be an electroosmotic pump 600.

The gear assembly 700 is a component for transmitting driving force generated from the actuator 600 . Specifically, the gear assembly 700 receives the driving force from the actuator 600 and transmits the driving force to the rotating member 500 again. During this process, the rotation member 500 may rotate in the first rotation direction R1.

The actuator 600 may include a main driving device 610 and a first sub driving device 620 . The main driving device 610 forms a driving force. The first sub driving device 620 transmits the driving force generated from the main driving device 610 to the gear assembly 700 . The main driving device 610 and the first sub driving device 620 may be spaced apart from each other. The first sub driving device 620 may be formed in a smaller size than the main driving device 610 . The first sub driving device 620 may be disposed close to the gear assembly 700 . On the other hand, the main driving device 610 may be disposed far from the first sub driving device 620. In this case, there is an advantage in that the relatively large size of the main driving device 610 can be efficiently disposed inside the housing 100, thereby minimizing the overall size of the chemical solution injection device 1000.

Hereinafter, the operation of the chemical liquid injection device and its control method according to an embodiment of the present invention will be described.

Before injecting the chemical solution (L), the head 310 is disposed on the side of the injection port 220 in the chemical storage space 210 with the rod 320 inserted into the holder 400 (FIG. 3(a)) . And, when the chemical solution L is injected into the chemical storage space 210 through the injection port 220, the rod 320 and the holder 400 together with the head 310 are pushed in the first direction D1. At this time, the holder 400 into which the rod 320 is inserted is inserted into the holder insertion hole 510 of the rotating member 500 (FIG. 3(b)). In this state, when the rotating member 500 rotates, the holder 400 inserted into the holder insertion hole 510 of the rotating member 500 also engages with the rotating member 500 and rotates together. At this time, by the male thread 321 and the female thread 411 formed in the rod 320 and the rod insertion hole 410, the holder 400 moves away from the rod 320 and in the direction toward the rotating member 500. is pressurized Therefore, the holder 400 rotates while being fixedly disposed in the holder insertion hole 510 of the rotating member 500, and thus only the rod 320 moves in the second direction D2, which is a direction away from the holder 400. (FIG. 3 (c)).

FIG. 4 shows a holder having a polygonal cross section and a holder insertion hole corresponding thereto, and FIG. 5 shows a holder having fixing protrusions and a holder inserting hole having fixing grooves corresponding thereto.

As shown in FIG. 4 , the cross section of the holder 400 may be formed in a polygonal shape. In addition, the cross section of the holder insertion hole 510 of the rotating member 500 into which the holder 400 is inserted may be formed in a polygonal shape similar to the cross section of the holder 400 . In this case, the holder 400 may be disposed so as not to rotate relative to the rotating member 500 while being inserted into the rotating member 500 . In FIG. 4 , cross sections of the holder 400 and the holder insertion hole 510 are illustrated as being rectangular, but this is merely an example and is not limited thereto. Although not shown in the drawing, the cross section of the holder 400 may be formed in a curved shape rather than a circular shape. For example, the cross section of the holder 400 may be formed in an elliptical shape to engage with the holder insertion hole 510 .

As shown in FIG. 5 , a fixing protrusion 420 may be formed on the holder 400 . In addition, a fixing groove 520 corresponding to the fixing protrusion 420 may be formed in the holder insertion hole 510 of the rotating member 500 into which the holder 400 is inserted. In this case, the holder 400 may be disposed so as not to rotate relative to the rotating member 500 while being inserted into the rotating member 500 . In FIG. 6, it is shown that one fixing protrusion 420 and one fixing groove 520 are formed in the holder 400 and the holder insertion hole 510, respectively, but this is only an example, and the fixing protrusion 420 and the fixing The shape or number of grooves 520 is not limited thereto.

6 shows a plunger moving inside the storage device by a gear assembly, FIG. 7 shows a top view of a rotating member, a gear assembly, and an actuator, and FIG. 8 shows a main drive gear member with a hook. It shows the rotation of the driven gear member formed with teeth.

Hereinafter, referring to FIGS. 6 to 8 , the gear assembly 700 will be described in more detail.

The gear assembly 700 may include a main gear member 710 and a driven gear member 720. The main gear member 710 is a gear member that directly receives driving force from the actuator 600 . The driven gear member 720 is a gear member that receives driving force from the main gear member 710 . The driven gear member 720 can be rotated by the main gear member 710. The driven gear member 720 may be fixed to the other end of the rotating member 500 . When the driven gear member 720 rotates while being fixed to the other end of the rotating member 500, the rotating member 500 may also rotate integrally together. The driven gear member 720 can rotate only in the first rotational direction R1.

A plurality of teeth 721 may be formed in the driven gear member 720 . Each of the plurality of teeth 721 may be formed to be inclined along one direction. Specifically, each tooth 721 may include an inclined portion and a stepped portion. The inclined portion is formed to be inclined along the first rotational direction R1, and a stepped portion is formed at the end of the inclined portion. The plurality of teeth 721 may protrude outward from the driven gear member 720 in the radial direction. In this case, the width of the space occupied by the teeth 721 in the horizontal direction can be reduced, so that the size of the housing 100 can be manufactured compactly.

Hooks 711 and 712 engaged with the teeth 721 of the driven gear member 720 may be formed in the main gear member 710 . The hooks 711 and 712 may include a first hook 711 and a second hook 712 . The first hook 711 may engage with the teeth 721 formed on the upper side of the driven gear member 720, and the second hook 712 may engage with the teeth 721 formed on the lower side of the driven gear member 720. there is. The first hook 711 and the second hook 712 may be formed to be vertically symmetrical to each other. A rotating shaft 713 and a moving guide 714 may be formed in the main gear member 710 . The rotating shaft 713 may be formed at a height between the first hook 711 and the second hook 712 . The movement guide 714 may be a groove formed on the opposite side of the hooks 711 and 712 with respect to the rotation shaft 713 . The moving guide 714 is a part that directly receives driving force from the actuator 600 . For example, the movement guide 714 may vertically reciprocate by the actuator 600, and the hooks 711 and 712 may rotate and reciprocate by the rotary shaft 713.

The movement guide 714 of the main gear member 710 may reciprocate in a third direction D3, which is a direction toward the base 110, and in a fourth direction D4, which is a direction away from the base 110. When the movement guide 714 moves in the third direction D3, the first hook 711 and the second hook 712 rotate in the first rotational direction R1. In this process, the first hook 711 is separated from the tooth 721, the second hook 712 slides on the inclined portion of the tooth 721, and the driven gear member 720 does not rotate. When the movement guide 714 moves in the fourth direction D4, the first hook 711 and the second hook 712 rotate in the second rotation direction R2 opposite to the first rotation direction R1. do. In this process, the first hook 711 pulls the stepped portion of the tooth 721, the second hook 712 is separated from the tooth 721, and the driven gear member 720 moves in the first rotational direction (R1). ) to rotate.

That is, the main gear member 710 may have a pawl structure including hooks 711 and 712, and the driven gear member 720 may have a ratchet gear structure. 6 to 8 show an example of the present invention, and the shapes of the teeth 721 and the hooks 711 and 712 are not limited thereto.

9 is an enlarged view of the actuator separately, and FIG. 10 is an enlarged view of the actuator including the first sub drive device and the second sub drive device.

Hereinafter, referring to FIGS. 9 and 10 , the actuator 600 will be described in more detail. The main driving device 610 of the actuator 600 may be an electroosmotic pump 610. The electroosmotic pump 610 is a power engine capable of generating a driving force according to the movement of the fluid F through a reversible chemical reaction by electric energy. The electroosmotic pump 610 may include a main driving case 611 and a membrane 614 .

Fluid F may be stored inside the main driving case 611 . A first space 612 and a second space 613 may be formed inside the main driving case 611 . A membrane 614 may be disposed between the first space 612 and the second space 613 . An electrode (not shown) may be disposed on the membrane 614 .

When the main driving device 610 is the electroosmotic pump 610, a first movable block 622 may be disposed inside the first sub driving device 620. The first movable block 622 may be disposed to reciprocate in a vertical direction with respect to the bottom surface. Specifically, the first movable block 622 may be disposed to reciprocate in the third direction D3 or the fourth direction D4 based on the base 110 . At least a part of the first movable block 622 may protrude outward from the first sub driving device 620 . The protruding part of the first moving block 622 can be inserted into the moving guide 714 to rotate the main gear member 710 .

A first tube 630 may be disposed between the main driving device 610 and the first sub driving device 620 . The first tube 630 may be disposed to communicate with the inside of the main driving device 610 and the first sub driving device 620, respectively. Two first tubes 630 may be provided. One first tube 630 may communicate with the first space 612 of the main driving device 610 and the upper inner space of the first sub driving device 620, respectively. The other first tube 630 may communicate with the second space 613 of the main driving device 610 and the lower inner space of the first sub driving device 620, respectively. In this case, the fluid F moving from the main drive device 610 to the first space 612 passes through the first tube 630 and passes through the first sub drive device 620 to the first moving block 622. can be moved in the third direction D3. In addition, the fluid F moving from the main drive device 610 to the second space 613 passes through the first tube 630 and passes through the first sub drive device 620 to the first moving block 622. It can be moved in the fourth direction D4.

The actuator 600 may further include a second sub driving device 640 in addition to the first sub driving device 620 . Like the first sub-drive device 620, the second sub-drive device 640 may be spaced apart from the main drive device 610. Also, the second sub driving device 640 may include a second moving block identical to the first moving block 622 of the first sub driving device 620 . In addition, the actuator 600 may further include a second tube 650 connecting the second sub driving device 640 and the main driving device 610 . The first sub driving device 620 and the second sub driving device 640 may be connected to one main driving device 610 .

When the second sub-driving device 640 is further included, two storage devices 200, plungers 300, holders 400, rotating members 500, and gear assemblies 700 may be respectively provided. In this case, the two rotating members 500 and the gear assembly 700 may be driven by being connected to the first sub driving device 620 and the second sub driving device 640, respectively. That is, the same effect as when two liquid injection devices 1000 are disposed on one base 110 can be obtained.

11 is a conceptual diagram illustrating a connection relationship between an actuator, a controller, and a timer.

Hereinafter, with reference to FIG. 11, the operation of the controller 800 will be described in detail.

A drug solution injection device and a control method thereof according to an embodiment of the present invention may include a controller 800 and a timer 900. The controller 800 is a component that controls the actuator 600 . The controller 800 may control the actuator 600 so that the chemical solution L in the storage device 200 can be constantly discharged to the outside. The timer 900 is a component for measuring time and time and transmitting generated time and time data to the control unit 800 .

The control method by the controller 800 may include steps (a), (b) and (c). Step (a) is a step of rotating the rotating member 500 in the first rotational direction (R1) for a first time. In step (a), the control unit 800 may control the actuator 600 so that the first moving block 622 of the first sub driving device 620 moves in the fourth direction D4 for the first time. In this process, the driven gear member 720 rotates in the first rotation direction R1. Step (b) is a step in which the gear assembly 700 stops for the second time. In step (b), the control unit 800 can stop the first moving block 622 by cutting off the electrical energy supplied to the actuator 600 . The amount of the chemical liquid L discharged per hour may be adjusted by adjusting the second time period. Step (c) is a step in which the rotating member 500 stops for the third time. The controller 800 may control the actuator 600 so that the first moving block 622 of the first sub driving device 620 moves in the third direction D3 for the third time period. In this process, the driven gear member 720 stops.

The controller 800 may control the actuator 600 so that steps (a), (b), and (c) are sequentially repeated for a predetermined time set in the timer 900 . The control unit 800 rotates the rotating member 500 in the first rotational direction R1 by one tooth 721 while the processes of steps (a), (b) and (c) are repeated once. The actuator 600 can be controlled to do so. In this case, the plunger 300 may move constantly in the second direction for a predetermined time. Accordingly, there is an advantage in that the chemical liquid L stored in the storage device 200 can be constantly discharged in a minute amount through the discharge port 230 .

The actuator 600 may further include a second sub driving device 640 in addition to the first sub driving device 620 . The second sub driving device 640 may have the same configuration as the first sub driving device 620 . In this case, two storage devices 200, plungers 300, holders 400, rotating members 500, and gear assemblies 700 may be provided. In this case, the two rotating members 500 and the gear assembly 700 can be driven by being connected to the first sub driving device 620 and the second sub driving device 640, respectively, and on one base 110. In this case, the effect of disposing the two drug solution injection devices 1000 can be obtained. At this time, steps (a), (b) and (c) may be separately controlled by the first sub driving device 620 and the second sub driving device 640, respectively. Also, the first sub driving device 620 and the second sub driving device 640 may be controlled independently of each other by one controller 800 .

Although one embodiment of the present invention has been described above, those skilled in the art can add, change, delete, or add components within the scope not departing from the spirit of the present invention described in the claims. It will be possible to variously modify and change the present invention by the like, and it will be said that such modifications and changes are also included within the scope of the present invention.

1000: chemical liquid injection device
100: housing 110: base
120: upper case
200: storage device 210: liquid storage space
220: inlet 230: discharge port
300: plunger 310: head
320: rod 321: male thread
400: holder 410: rod insertion hole
411: female thread 420: fixing protrusion
500: rotating member 510: holder insertion hole
520: fixed groove
600: actuator 610: main driving device, electroosmotic pump
611: main driving case 612: first space
613: second space 614: membrane
620: first sub driving device 621: first sub driving case
622: first moving block 630: first tube
640: second sub driving device 650: second tube
700: gear assembly 710: main gear member
711: first hook 712: second hook
713: rotation axis 714: moving guide
720: driven gear member 721: sawtooth
800: control unit
900: timer

Claims (20)

a storage device having a storage space for storing the chemical solution therein;
a plunger disposed movably in the chemical storage space and including a rod having a male thread;
a holder into which the rod can be inserted and having female threads corresponding to the male threads;
a rotating member having one end rotatably disposed in the storage device and into which the holder can be inserted;
a gear assembly for rotating the rotating member; and
An actuator including a main driving device for generating a driving force and a first sub driving device spaced apart from the main driving device and providing a driving force to the gear assembly,
The internal structure of the chemical solution injection device in which the holder and the rotating member do not rotate relative to each other. According to claim 1,
The shape of the cross section of the holder is not circular,
Internal structure of the chemical solution injection device that can be inserted into the rotating member to engage the holder. According to claim 1,
A fixing protrusion is formed on the holder,
The internal structure of the chemical liquid injection device in which a fixing groove into which the fixing protrusion is inserted is formed in the rotating member. According to claim 1,
The gear assembly,
A main gear member that receives driving force directly from the actuator and includes a hook;
The internal structure of the liquid medicine injection device comprising a driven gear member fixed to the other end of the rotating member, receiving driving force from the main gear member and rotating the rotating member, and having teeth formed thereon. According to claim 4,
The main gear member,
A first hook engaged with the teeth formed on the upper side of the driven gear member;
Internal structure of the chemical solution injection device including a second hook engaged with the teeth formed on the lower side of the driven gear member and formed vertically symmetrically with the first hook. According to claim 4,
The teeth are
Internal structure of the chemical liquid injection device protruding outward in the radial direction of the driven gear member, provided with a plurality, and each inclined along one direction. According to claim 1,
The main driving device,
Internal structure of an electroosmotic pump that generates a driving force according to the movement of the fluid stored inside. According to claim 7,
Further comprising a first tube connecting the electroosmotic pump and the first sub-drive device;
The first sub-drive device includes a first movable block at least partially protruding outward and capable of reciprocating in a vertical direction with respect to a bottom surface;
The internal structure of the chemical solution injection device for moving the first moving block by flowing the fluid inside the electroosmotic pump into the first sub-drive device through the first tube. According to claim 1,
The actuator,
Internal structure of the chemical solution injection device further comprising a second sub-drive device spaced apart from the main drive device and providing a driving force to the gear assembly. a storage device having a storage space for storing the chemical solution therein;
a plunger disposed movably in the chemical storage space and including a rod having a male thread;
a holder into which the rod can be inserted and having female threads corresponding to the male threads;
a rotating member having one end rotatably disposed in the storage device and into which the holder can be inserted;
a gear assembly for rotating the rotating member;
an actuator including a main driving device generating a driving force and a first sub driving device spaced apart from the main driving device and providing a driving force to the gear assembly; and
A housing forming an external shape and having the storage device, the plunger, the holder, the rotating member, the actuator, and the gear assembly disposed therein,
The holder and the rotating member do not rotate relative to each other. According to claim 10,
The shape of the cross section of the holder is not circular,
A chemical solution injection device that can be inserted into the rotation member so that the holder is engaged. According to claim 10,
A fixing protrusion is formed on the holder,
The rotating member has a fixing groove into which the fixing protrusion is inserted. According to claim 10,
The gear assembly,
A main gear member that receives driving force directly from the actuator and includes a hook;
A liquid medicine injection device comprising a driven gear member fixed to the other end of the rotating member, receiving a driving force from the main gear member to rotate the rotating member, and having teeth formed thereon. According to claim 13,
The main gear member,
A first hook engaged with the teeth formed on the upper side of the driven gear member;
A chemical solution injection device comprising a second hook engaged with a tooth formed on a lower side of the driven gear member and formed vertically symmetrically with the first hook. According to claim 13,
The teeth are
A chemical solution injection device protruding outward in a radial direction of the driven gear member, provided with a plurality, and each inclined along one direction. According to claim 10,
The main driving device,
An electroosmotic pump that generates a driving force according to the movement of the fluid stored inside. 17. The method of claim 16,
Further comprising a first tube connecting the electroosmotic pump and the first sub-drive device;
The first sub-drive device includes a first movable block at least partially protruding outward and capable of reciprocating in a vertical direction with respect to a bottom surface;
The fluid inside the electroosmotic pump flows into the first sub-drive device through the first tube to move the first moving block. According to claim 10,
The actuator,
The chemical liquid injection device further comprising a second sub-drive device spaced apart from the main drive device and providing a driving force to the gear assembly. a storage device having a storage space for storing the chemical solution therein; a plunger disposed movably in the chemical storage space and including a rod having a male thread; a holder into which the rod can be inserted and having female threads corresponding to the male threads; a rotating member having one end rotatably disposed in the storage device and into which the holder can be inserted; a gear assembly for rotating the rotating member; and an actuator including a main driving device generating a driving force and a first sub driving device spaced apart from the main driving device and providing a driving force to the gear assembly, wherein the holder and the rotating member do not rotate relative to each other. In the injection device,
(a) rotating the rotating member in a first rotational direction for a first time;
(b) stopping the gear assembly for a second time; and
(c) stopping the rotating member for a third time;
While the steps (a), (b) and (c) are sequentially repeated for a predetermined time, the rotating member is controlled to rotate in the first rotational direction by one tooth. method. According to claim 19,
The chemical liquid injection device,
The storage device, the plunger, the holder, the rotating member, and the gear assembly are provided with two each,
The actuator further includes a second sub driving device spaced apart from the main driving device and providing a driving force to the gear assembly,
The first sub driving device and the second sub driving device provide driving force to the two gear assemblies, respectively;
A method for controlling a chemical solution injection device in which steps (a), (b) and (c) are repeated in each of the first sub-drive device and the second sub-drive device.

Images