Liquid medicine injection device having piston-check valve module

Abstract

The present invention relates to a liquid medicine injection device comprising: a solenoid that receives power to generate magnetic force; a first moving body that moves back and forth by means of the magnetic force of the solenoid; a second moving body linked with the back and forth movement of the first moving body so as to move back and forth; a reservoir for storing liquid medicine; and a piston-check valve module into which the liquid medicine stored in the reservoir is supplied so as to be discharged to the outside, wherein the operations for supplying the liquid medicine into the piston-check valve module and discharging the liquid medicine to the outside of the piston-check valve module are performed by means of the back and forth movement of the first moving body, and both the operations for supplying the liquid medicine into the piston-check valve module and discharging the liquid medicine to the outside of the piston-check valve module are performed by means of a single back and forth movement of the first moving body.

Description

Liquid injection device with piston check valve module

[0001] The present invention relates to a chemical injection device capable of precisely controlling the injection of a small amount of chemical liquid, and more particularly, to a compact structural technology that minimizes the size of the device by configuring two check valves having different flow directions into a single integrated module while controlling a space for precisely controlling the chemical liquid using a piston.

[0002] Drug injection devices are widely used to inject medicinal liquids such as hormones into the human body to treat various diseases.

[0003] For example, for diabetes treatment, insulin infusion devices are used to inject medication into a patient's body. While these devices are sometimes used by medical professionals, such as doctors and nurses, they are often used by the patient themselves or by ordinary individuals, such as their guardians. Diabetics, especially those with pediatric diabetes, require the injection of medications like insulin at regular intervals. Therefore, patch-type medication infusion devices are being developed, which can be attached to the body for a set period of time and used in a patch-like manner.

[0004] It is crucial for these drug injection devices to inject the drug in a precise amount. To achieve this, the device requires a structure that distributes the drug in a precise amount within the device.

[0005] The purpose of the present invention is to provide a drug injection device having a compact structure and capable of more accurately controlling a small amount of drug solution injected into the human body.

[0006] The present invention is a liquid injection device, comprising: a solenoid (130) that receives power and generates magnetic force; a first moving body (140) that reciprocates by the magnetic force of the solenoid; a second moving body (150) that reciprocates in conjunction with the reciprocating motion of the first moving body; a reservoir (230) that stores liquid medicine; and a piston-check valve module (250) that receives liquid medicine stored in the reservoir into the interior and discharges it to the exterior; wherein, by the reciprocating motion of the first moving body, liquid medicine is supplied into the piston-check valve module and discharged to the exterior of the piston-check valve module.

[0007] The first moving body (140) and the second moving body (150) are spaced apart from each other by a predetermined distance and are arranged parallel to each other, and further include a lever (160) having one end coupled to the upper end of the first moving body and the other end coupled to the second moving body, and having a pivot axis positioned at a predetermined point between the two ends; and by one reciprocating motion of the first moving body, both the liquid supply motion into the piston-check valve module and the liquid discharge motion out of the piston-check valve module are performed.

[0008] The pivot shaft (162) of the above lever is positioned closer to the other end coupled to the second movable body than to the one end coupled to the first movable body, thereby making the vertical movement distance of the second movable body smaller than the vertical movement distance of the first movable body, thereby reducing the single discharge amount of the liquid from the piston-check valve module, and applying a smaller force to one end of the pivot shaft than to the other end of the pivot shaft.

[0009] The piston-check valve module (250) includes a quantitative control space (251) in which a certain amount of chemical liquid is supplied and received; an injection passage (252) through which chemical liquid is injected into the quantitative control space; a discharge passage (253) through which chemical liquid is discharged from the quantitative control space; and a piston (255) coupled to the upper end of the second moving body and reciprocating within the quantitative control space.

[0010] It further includes a piston lower member (256) formed by increasing the radius at the lower portion of the piston (255); and a coupling member (M) that couples the piston lower member (256) to the upper end of the second moving body.

[0011] During the reciprocating motion of the piston, when the piston moves in the first direction in which the quantitative control space is opened, an injection process is performed in which the chemical solution stored in the reservoir is injected into the quantitative control space through the injection passage, and when the piston moves in the second direction opposite to the first direction, a discharge process is performed in which the chemical solution stored in the quantitative control space is discharged to the outside through the discharge passage, and in the discharge process, the injection passage is closed by the side outer surface of the piston so that the chemical solution in the quantitative control space does not move toward the injection passage.

[0012] A first check valve (CV1) is provided in the above injection passage to allow the drug to move only to the quantitative control space and prevent it from moving in the opposite direction; and a second check valve (CV2) is provided in the above discharge passage to allow the drug to move only from the quantitative control space to the outside and prevent it from moving in the opposite direction.

[0013] The drug injection device of the present invention utilizes a single integrated module configuration comprising a quantitative control space using a piston and two check valves arranged in different directions to inflow and discharge into the space, thereby enabling the amount of drug injected into the human body to be extremely small, allowing for more precise control of the amount of drug, and also exhibiting the effect of reducing the size of the device.

[0014] Figures 1 and 2 are front and rear views of the drug injection device according to the present invention.

[0015] Figure 3 is a view showing the reusable module and the disposable module separated from the liquid injection device according to the present invention.

[0016] Figure 4 is an exploded perspective view of the reuse module of the liquid injection device according to the present invention.

[0017] Figure 5 is an exploded perspective view of a disposable module in a liquid injection device according to the present invention.

[0018] Figures 6 to 9 are drawings showing the internal structure of the liquid injection device according to the present invention and the operation of the piston check valve module.

[0019] Figures 10 and 11 illustrate a structure for controlling the up-and-down movement of a piston in a liquid injection device of the present invention.

[0020] Referring to FIGS. 1 to 3, a drug injection device according to one embodiment of the present invention comprises a rechargeable module (100) that can be recharged and reused, and a disposable module (200) that is replaced after use, and further includes an attachment member (not shown) for attaching the disposable module to a human body, and a tube (T) for guiding the drug discharged from the disposable module to a needle (not shown) inserted into a human body. In addition, a separation button (B) for separating the reusable module and the disposable module from each other is provided on the front side of the drug injection device, and the reusable module and the disposable module can be separated from each other by pressing the separation button (FIG. 3).

[0021] However, the drug injection device of the present invention is not limited to such a detachable modular structure. That is, the drug injection device of the present invention may be an integral structure that is structurally inseparable. Therefore, the internal structure of the drug injection device of the present invention, described below, is applicable to both an integral structure and a detachable modular structure.

[0022] However, the following description will be based on a combined structure of a reusable module (100) that can be reused repeatedly and a disposable module (200) that is replaced after use.

[0023]

[0024] [Structure of reusable and disposable modules]

[0025] Referring to Fig. 4, the structure of the reusable module (100) will be examined. The reusable module (100) has a structure that can be separated from the disposable module (200) using a separation button (B), and can be reused repeatedly. The reusable module (100) has an upper case (111) and a lower case (112), and inside these cases, a main PCB (114), a lower bracket (116), and an upper bracket (118) are provided. And, as a member accommodated by the upper bracket and the lower bracket, etc., it comprises a battery (120) that stores electric power, a solenoid (130) that receives electric power from the battery and generates magnetic force, a first moving body (140) that reciprocates up and down with the magnetic force generated by the solenoid, and a second moving body (150) that performs an up and down reciprocating motion linked to the up and down reciprocating motion of the first moving body and discharges the medicine stored in the disposable module (200). In addition, a lever (160) that links the up and down reciprocating motions of the first moving body and the second moving body is provided.

[0026] In Fig. 5, a disposable module (200) of a drug injection device according to the present invention is illustrated. The disposable module (200) includes an inner case (210) and an outer case (220) coupled on top of the inner case, and includes a reservoir (230) for storing a drug as a member provided inside the cases, a piston-check valve module (250) for discharging a certain amount of the drug, and a connector (240) for connecting the reservoir and the piston-check valve module to transmit the drug. The drug stored in the reservoir (230) is transmitted to the piston-check valve module (250) via the connector (240).

[0027]

[0028] [Quantitative Control Structure]

[0029] Hereinafter, with reference to FIGS. 6 to 9, a structure for discharging a liquid in a state where the reusable module (100) and the disposable module (200) are combined will be described.

[0030] The first moving body (140) of the above reusable module (100) is composed of a central axis (142) and an outer member (144). The entire first moving body (140) may be composed of magnets, or it may be located at the center and only the central axis (142) may be composed of magnets. The first moving body moves up and down by the magnetic force generated by the solenoid (130). In addition, the lever (160) is a member whose left and right ends move up and down based on a pivot axis (162) that is arranged approximately horizontally and is located at a certain point between the two ends.

[0031] In the up-and-down reciprocating motion described here, the meaning of “up-and-down direction” refers to the upward and downward directions as seen in the drawing of Fig. 6, and refers to the direction parallel to the longitudinal direction of the central axis (142).

[0032] The upper end of the central axis (142) of the first moving body (140) is coupled with one end (164) of the lever (160), and the other end (166) of the lever (160) is coupled to the second moving body (150). The pivot axis (162) may be positioned closer to the other end rather than at the exact center point between the two ends, and in the present invention, the pivot axis (162) is positioned at a point closer to the second moving body.

[0033] By configuring the position of the pivot axis to be biased toward the second moving body in this way, there is an advantage in that small amount of liquid can be controlled and the second moving body can be reciprocated with a relatively small force on the solenoid side. That is, by making the vertical reciprocating movement distance of the second moving body smaller than the vertical reciprocating movement distance of the first moving body, the liquid discharged from the quantitative control space (251) to be described below can be controlled in a smaller amount, and also, by the lever principle, the second moving body can be operated with a smaller force than the force required for the vertical movement of the first moving body.

[0034] When the first moving body (140) moves forward (moves upward), the second moving body (150) moves backward (moves downward) (as shown in FIG. 6), and when the first moving body (140) moves backward (moves downward), the second moving body (150) moves forward (moves upward) (as shown in FIG. 8).

[0035] Figures 6 and 8 show the overall operation of the first and second moving bodies, and Figures 7 and 9 are enlarged detailed drawings for explaining the operation structure of the piston-check valve module (250) of the disposable module (200) in Figures 6 and 8.

[0036] First, the structure of the piston-check valve module (250) of the disposable module (200) will be examined. The piston-check valve module (250) has a quantitative control space (251) where a certain amount of chemical liquid is supplied and received, an injection passage (252) through which the chemical liquid is injected is formed in the horizontal direction of the quantitative control space (251), and a discharge passage (253) through which the chemical liquid is discharged is formed on the upper side of the quantitative control space (251). The quantitative control space (251) is a cylindrical space formed in the vertical direction, and a piston (255) moves up and down reciprocally inside the quantitative control space (251). A circular piston lower member (256) formed with an increasing radius is provided at the lower portion of the piston (255). The injection passage (252) is provided inside the connector (240).

[0037] And, the piston lower member (256) is coupled to the upper end of the second moving body (150) of the reuse module (100) and moves up and down together with the second moving body, and as a result, the piston moves up and down. The piston lower member (256) is coupled to the upper end of the second moving body (150) of the reuse module (100) by a coupling member (M) located inside the piston lower member (256). When the first moving body (140) moves up and down by the operation of the solenoid (130) of the reuse module (100), the second moving body (150) moves up and down accordingly, and as a result, the piston (255) moves up and down inside the quantitative control space (251).

[0038] At this time, when the piston (255) moves down, the quantitative control space (251) is opened, and an injection process is performed in which the medicinal solution stored in the reservoir (230) is injected into the quantitative control space through the injection passage (252) (Figs. 6 and 7). Then, when the piston (255) moves up, the medicinal solution in the quantitative control space (251) is discharged to the outside through the discharge passage (253) and discharged to the tube (T in Fig. 1) to be supplied to the inside of the human body (Figs. 8 and 9). The piston also functions as a kind of check valve during the medicinal solution discharge process. When looking at the process in which the medicinal solution is discharged to the outside from the quantitative control space, the piston (255) has a structure that functions as a kind of check valve by closing the injection passage (252) by the outer surface of the side surface, so that the medicinal solution does not move to the injection passage (252) on the reservoir side.

[0039] In addition, first and second check valves (CV1, CV2) are arranged in each of the injection passage (252) through which the chemical liquid is injected into the quantitative control space (251) and the discharge passage (253) through which the chemical liquid from the quantitative control space (251) is discharged to block reverse flow. The first check valve (CV1) allows the chemical liquid to move only from the connector (240) to the quantitative control space (251) and prevents it from moving in the opposite direction, and the second check valve (CV2) allows the chemical liquid to move only from the quantitative control space (251) toward the tube and prevents it from moving in the opposite direction.

[0040] The present invention has developed a compact structure in which two check valves are configured in a direction perpendicular to each other in an injection passage and a discharge passage together with a quantitative control space using a piston as described above, and these are configured as a single integrated module, thereby drastically reducing the size of the product.

[0041] The present invention has a structure of a piston-check valve module (250) such that a small amount of a fixed amount of a medicinal solution can always be injected into the quantitative control space (251) and also injected into the human body. That is, by one up-and-down reciprocating motion of the piston (255), a medicinal solution equivalent to the amount of the quantitative control space can be injected into the human body. The specific amount of the medicinal solution to be injected can be determined by the size of the quantitative control space (251) (diameter of the piston (255), reciprocating movement distance (stroke) of the piston, etc.), and this can be determined according to the specific situation of supplying the medicinal solution.

[0042]

[0043] [Piston up-and-down stroke control]

[0044] Figures 10 and 11 illustrate the principle of controlling the up-and-down reciprocating movement distance (movement stroke) of the second moving body (150) in the drug injection device of the present invention. The up-and-down reciprocating movement distance of the second moving body determines the up-and-down movement distance of the piston (255) in the quantitative control space, and as a result, the amount of drug injected into the human body for one time is determined.

[0045] In order to control the movement amount of the second moving body (150), the second moving body (150) is provided with a movement amount limiting member (152). The movement amount limiting member (152) has an opening (153) penetrating through the center, and the opening is formed in an approximately rectangular shape. The upper surface of the inner surface is referred to as the upper surface (154), and the lower surface of the inner surface is referred to as the lower surface (156).

[0046] The lower case (112) of the above reusable module (100) is formed with two protruding members spaced apart from each other in the vertical direction, and is composed of a first protruding member (172) positioned relatively upward and a second protruding member (174) positioned relatively downward. The first protruding member (172) and the second protruding member (174) protrude from the bottom surface of the lower case (112) and are positioned inside the opening (153) of the movement amount limiting member (152).

[0047] As described above, the second moving body (150) moves up and down by the operation of the solenoid (130), and the amount of up and down movement is limited by the first protruding member (172) and the second protruding member (174) that are fixed to the lower case (112) and protrude.

[0048] Referring to Fig. 10, the second moving body is moved downward and is positioned at the lowest position, and at this time, the upper surface (154) of the opening (153) comes into contact with the first protruding member (172) (contact point C1). And, referring to Fig. 11, the second moving body is moved upward and is positioned at the highest position, and at this time, the lower surface (156) of the opening (153) comes into contact with the second protruding member (174) (contact point C2).

[0049] In other words, by the structure of the first and second protruding members (172, 174) and the opening (153), the vertical movement distance of the movement amount limiting member (second movable body) is controlled by a predetermined distance (d), and as a result, the vertical movement amount of the piston is controlled. In this regard, the first protruding member (172) and the second protruding member (174) serve as stoppers that determine the vertical movement limit point in the up-and-down reciprocating motion of the second movable body. For reference, in the present invention, the vertical movement distance (d) of the second movable body is controlled to 0.64 mm.

[0050] The present invention utilizes such a structure to minimize the amount of drug injected into the human body at a time and to control the amount of drug more precisely.

Claims

1. A solenoid (130) that receives power and generates magnetic force; A first moving body (140) that reciprocates by the magnetic force of the above solenoid; A second moving body (150) that reciprocates in conjunction with the reciprocating motion of the first moving body; A reservoir (230) for storing the drug; and It includes a piston-check valve module (250) that receives the drug solution stored in the reservoir internally and discharges it externally; A liquid injection device in which the liquid is supplied into the piston-check valve module and the liquid is discharged out of the piston-check valve module by the reciprocating motion of the first moving body.

2. In paragraph 1, The first moving body (140) and the second moving body (150) are spaced apart from each other by a predetermined distance and are arranged parallel to each other. A liquid injection device further comprising a lever (160) having a pivot axis positioned at a predetermined point between the two ends, the lever having one end coupled to the upper end of the first moving body and the other end coupled to the second moving body.

3. In paragraph 2, A liquid injection device in which both the liquid supply into the piston-check valve module and the liquid discharge out of the piston-check valve module are performed by one reciprocating motion of the first moving body.

4. In paragraph 3, The pivot axis (162) of the lever is located at a point closer to the other end (166) of the lever coupled to the second movable body than to one end (164) of the lever coupled to the upper end of the first movable body. By making the reciprocating movement distance of the second moving body smaller than the reciprocating movement distance of the first moving body, the amount of liquid discharged at a time from the piston-check valve module is made small. A liquid injection device that allows a smaller force to be applied to one end of the pivot shaft than to the other end of the pivot shaft.

5. In the second paragraph, the piston-check valve module (250) A quantitative control space (251) where a certain amount of liquid is supplied and received; An injection passage (252) through which a drug solution is injected into the above quantitative control space; A discharge passage (253) through which the liquid is discharged from the above quantitative control space; and A liquid injection device including a piston (255) coupled to the upper end of the second moving body and reciprocating within the quantitative control space.

6. In paragraph 5, A piston lower member (256) formed by increasing the radius at the bottom of the piston (255); and A liquid injection device further comprising a coupling member (M) that couples the piston lower member (256) to the upper end of the second moving body.

7. In paragraph 5, During the reciprocating motion of the piston, when the piston moves in the first direction in which the quantitative control space is opened, an injection process is performed in which the drug solution stored in the reservoir is injected into the quantitative control space through the injection passage. When the piston moves in the second direction opposite to the first direction, the liquid stored in the quantitative control space is discharged to the outside through the discharge passage, and A drug injection device in which the injection passage is closed by the outer side surface of the piston in the above discharge process, so that the drug in the quantitative control space does not move toward the injection passage.

8. In paragraph 7, A first check valve (CV1) provided in the above injection passage to allow the drug to move only to the quantitative control space and prevent it from moving in the opposite direction; and A chemical injection device further comprising a second check valve (CV2) installed in the above discharge passage to allow the chemical to move only to the outside from the quantitative control space and prevent it from moving in the opposite direction.

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