Liquid medicine injection device having means of controlling distance of movement of liquid medicine discharging movable body

Abstract

The present invention provides a liquid medicine injection device comprising: a solenoid (130) for generating a magnetic force by receiving power supplied thereto; a first movable body (140) which reciprocates by the magnetic force from the solenoid; a second movable body (150) disposed in parallel with the first moving body while being spaced apart therefrom by a predetermined distance, and configured to reciprocate while being interlocked with the reciprocating motion of the first moving body; a lever (160) having one end coupled to the upper end of the first movable body, having the other end coupled to the second movable body, and having a pivot shaft positioned at a predetermined point between the two ends; and a member (152) for limiting the amount of movement, which is provided integrally with the second movable body (150), and which has an opening (153) extending through the center thereof. A first protruding member (172) and a second protruding member (174) are provided inside the opening (153) and are formed to be spaced apart from each other by a predetermined distance such that the distance of movement of the second movable body in a direction are limited by the first and second protruding members.

Description

A liquid injection device having a movement distance control means for a liquid dispensing moving body

[0001] The present invention relates to a drug injection device capable of precisely controlling the injection of a small amount of drug, and more specifically, to a technology for controlling the movement interval of a piston that moves a storage space for discharging a drug.

[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 device capable of more accurately controlling a drug solution injected into a human body by providing a means for accurately controlling the movement distance of a moving body moving up and down for dispensing a drug solution.

[0006] The present invention comprises: 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 is arranged parallel to and spaced apart from the first moving body by a predetermined distance and reciprocates in conjunction with the reciprocating motion of the first moving body; a lever (160) that has one end coupled to the upper end of the first moving body and the other end coupled to the second moving body, and has a pivot shaft positioned at a predetermined point between the two ends; And a movement amount limiting member (152) integrally provided with the second moving body (150) and having an opening (153) penetrating through the center; and a first protruding member (172) and a second protruding member (174) formed at a predetermined distance apart from each other on the inside of the opening (153) are provided, and a drug injection device is provided in which the directional movement distance of the second moving body is limited by the first and second protruding members.

[0007] The first protruding member (172) is provided at a certain distance above the second protruding member (174), and if the upper surface of the inner surface of the opening is referred to as the upper surface (154) and the lower surface is referred to as the lower surface (156), the lowest position of the second movable body is a position where the upper surface of the opening contacts the first protruding member, and the highest position of the second movable body is determined as a position where the lower surface of the opening contacts the second protruding member.

[0008] The pivot shaft (162) of the above lever is located at a point 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 reciprocating movement distance of the second movable body smaller than the reciprocating movement distance of the first movable body, thereby reducing the single discharge amount of the liquid from the piston-check valve module, and is structured so that a smaller force can be applied to one end of the pivot shaft than to the other end of the pivot shaft.

[0009] The medicine stored in the disposable module is discharged to the outside by the reciprocating motion of the second moving body, and the amount of the medicine discharged to the outside is controlled by the distance between the first protruding member and the second protruding member.

[0010] The drug injection device of the present invention has a structure that controls the movement distance of a moving body that moves up and down by solenoid operation for drug discharge, thereby exerting the effect of more precisely controlling the extremely small amount of drug injected into the human body.

[0011] Figures 1 and 2 are front and rear views of the drug injection device according to the present invention.

[0012] Figure 3 is a view showing the reusable module and the disposable module separated from the liquid injection device according to the present invention.

[0013] Figure 4 is an exploded perspective view of the reuse module of the liquid injection device according to the present invention.

[0014] Figure 5 is an exploded perspective view of a disposable module in a liquid injection device according to the present invention.

[0015] 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.

[0016] 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.

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0018] Hereinafter, the present invention will be described in detail with reference to the attached drawings.

[0019] In the following description, the forward / retreat etc. are expressed as 'forward' when the moving body or piston, which is a component of the device of the present invention, moves upward as seen in the drawing, and 'retreat' when the moving body or piston moves downward as seen in the drawing, but this is only an expression for convenience of explanation and does not limit the scope of the rights of the present invention. In addition, the 'up and down' direction used in the following description is a direction based on the drawing for convenience of explanation, and such direction does not limit the scope of the rights of the 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 the human body, and a tube (T) for guiding the drug discharged from the disposable module to a needle (not shown) inserted into the 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). In FIG. 2, P-1 represents a position where the drug is injected.

[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 movable body (140) of the above-described reusable module (100) is composed of a central shaft (142) and an outer member (144). The entire first movable body (140) may be composed of magnets, or may be located at the center and only the central shaft (142) may be composed of magnets. The magnetic force generated by the solenoid (130) applies attractive and repulsive forces to the first movable body, causing it to reciprocate up and down. In addition, the lever (160) is a member whose left and right ends move up and down based on a pivot shaft (162) that is arranged approximately horizontally and is located at a certain point between the two ends. The meaning of "up and down direction" in the up and down reciprocation described herein means the upward and downward directions as seen in the drawing of FIG. 6, and means the direction parallel to the longitudinal direction of the central axis (142).

[0031] 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.

[0032] 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.

[0033] 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).

[0034] 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.

[0035] 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) in which 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).

[0036] 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).

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041]

[0042] [Piston up-and-down stroke control]

[0043] 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.

[0044] 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).

[0045] 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).

[0046] 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.

[0047] 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).

[0048] 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.

[0049] 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.

[0050] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

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 solenoid; a second moving body (150) that is arranged parallel to the first moving body and spaced apart from the first moving body by a predetermined distance and that reciprocates in conjunction with the reciprocating movement of the first moving body; a lever (160) that has one end coupled to the upper end of the first moving body and the other end coupled to the second moving body and has a pivot shaft positioned at a predetermined point between the two ends; and a movement amount limiting member (152) that is integrally provided to the second moving body (150) and has an opening (153) that penetrates the center; A liquid injection device in which a first protruding member (172) and a second protruding member (174) are formed at a certain distance apart from each other on the inside of the above opening (153), and the moving distance of the second moving body during the reciprocating motion is limited by the first and second protruding members.

2. In paragraph 1, The above first protruding member (172) is provided at a certain distance above the above second protruding member (174), and if the upper surface of the inner surface of the opening is called the upper surface (154) and the lower surface is called the lower surface (156), A liquid injection device in which the lowest position of the second moving body is determined as a position where the upper surface of the opening contacts the first protruding member, and the highest position of the second moving body is determined as a position where the lower surface of the opening contacts the second protruding member.

3. In paragraph 2, The pivot axis (162) of the above lever is located at a point closer to the other end coupled to the second moving body than to the one end coupled to the first moving 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.

4. In paragraph 2, The medicine stored in the disposable module is discharged to the outside by the reciprocating motion of the second moving body, A liquid injection device in which the amount of liquid discharged to the outside is controlled by the distance between the first protruding member and the second protruding member.

5. In paragraph 2, A liquid injection device in which the distance between the uppermost position and the lowermost position of the second moving body is 0.64 mm.

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