Automated infusion device

Abstract

Disclosed is an infusion supply device comprising: a housing; a first one-way valve coupled to a first end of the housing; a second one-way valve coupled to a second end of the housing; an infusion line connecting an outlet hole of the first one-way valve and an inlet hole of the second one-way valve to each other; a piezo actuator; and a control unit. When the control unit changes the voltage applied to the piezo actuator, the shape of the piezo actuator is changed so that the piezo actuator comes into contact with the infusion line to change the volume of the infusion line. The inlet hole of the first valve is configured to be connected to a first infusion supply line, which is configured to be connected to an infusion bag. In addition, the outlet hole of the second valve is configured to be connected to a second infusion supply line, which is configured to be connected to an infusion needle configured to penetrate a patient.

Description

automated IV injection device

[0001] The present invention relates to an intravenous fluid injection device for supplying intravenous fluid to a patient, and relates to a technology for automating intravenous fluid supply by combining it with an intravenous fluid injection tube constituting an existing intravenous fluid set.

[0002] The IV device may include an IV bag, which is a bag containing the IV to be directly administered to the patient through the patient's blood vessel, an IV needle that penetrates the patient's blood vessel, and an IV tube that connects the IV bag and the IV needle.

[0003] In general, the position of the IV bag must be maintained higher than the connection position of the blood vessel and the IV needle so that the IV can be administered to the patient from the IV bag by the difference in potential energy. For this purpose, a pole that can adjust the height of the IV bag is used.

[0004] An IV infusion device commonly found in hospitals is a device comprising a base with wheels for a patient to pull and move, a pole connected to the base and extending vertically upward, and a connecting member that can connect the pole and the IV bag to each other.

[0005] A pole is a device required to deliver intravenous fluids to a moving patient. To transfer the fluid from the IV bag to the patient, the IV bag must be installed at a high point on the pole. This configuration has the limitation that the fluid moves solely due to differences in potential energy, and the amount or speed of fluid movement is not actively controlled.

[0006] The present invention seeks to provide a fluid injection device capable of actively controlling the speed of fluid administered to a patient.

[0007] According to one aspect of the present invention, an infusion injection device (1) including a first infusion supply line (51), a second infusion supply line (52), and a infusion supply device (100) may be provided. The infusion supply device includes a housing (101); a first one-way valve (131) coupled to a first end of the housing (101); a second one-way valve (132) coupled to a second end of the housing (101); a infusion line (150) connecting an outlet hole of the first one-way valve and an inlet hole of the second one-way valve to each other; a piezo actuator (161); and a control unit (161). When the control unit changes a voltage applied to the piezo actuator, the shape of the piezo actuator changes, causing the piezo actuator to come into contact with the infusion line to change a volume of the infusion line. The inlet hole of the first valve is connected to the second end of the first fluid supply line. The outlet hole of the second valve is connected to the first end of the second fluid supply line.

[0008] At this time, the inlet hole of the first one-way valve and the outlet hole of the second one-way valve may be exposed toward the outside of the housing (101), and the outlet hole of the first one-way valve and the inlet hole of the second one-way valve may be arranged toward the inside of the housing (101).

[0009] At this time, the first end of the first fluid supply line may be connected to a fluid bag (80), and the second end of the second fluid supply line may be connected to a fluid injection needle that is intended to penetrate the patient.

[0010] At this time, the piezo actuator is fixed to the housing (101), and when the control unit applies a second voltage to the piezo actuator, the shape of the piezo actuator changes, so that the piezo actuator can be positioned at a position where it changes the shape or volume of the sap line.

[0011] At this time, the fluid supply device further includes a second piezo actuator arranged on the opposite side of the piezo actuator with the fluid line as the center, and in a first operation mode in which a first set of predetermined voltages are applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator are deformed in a direction in which a volume of the fluid line is increased, and in a second operation mode in which a second set of predetermined voltages are applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator can be deformed in a direction in which a volume of the fluid line is decreased.

[0012] At this time, in the second operation mode, both the piezo actuator and the second piezo actuator may be deformed in a direction toward the liquid line, and in the first operation mode, both the piezo actuator and the second piezo actuator may be deformed in a direction opposite to the direction toward the liquid line.

[0013] At this time, the piezo actuator may be disposed closer to the second unidirectional valve than the second piezo actuator, and the second piezo actuator may be disposed closer to the first unidirectional valve than the piezo actuator.

[0014] At this time, the sap supply device may further include a sap line support member (175) having a fixed shape and arranged on the opposite side of the piezo actuator with the sap line as the center in order to ensure a change in the volume of the sap line when the second voltage is applied to the piezo actuator.

[0015] At this time, a membrane (520) is provided at a point inside the second sap supply line, and a sap passage (522) may be formed in the membrane to allow only sap that provides a pressure higher than a predetermined threshold value to pass through.

[0016] At this time, a flexible membrane (520) having one or more cutting lines (521) formed therein may be provided at a point inside the second sap supply line.

[0017] According to another aspect of the present invention, a fluid supply device (100) may be provided, including a housing (101); a first one-way valve (131) coupled to a first end of the housing (101); a second one-way valve (132) coupled to a second end of the housing (101); a fluid line (150) connecting an outlet hole of the first one-way valve and an inlet hole of the second one-way valve; a piezo actuator (161); and a control unit (161). At this time, when the control unit changes a voltage applied to the piezo actuator, the shape of the piezo actuator changes, and the piezo actuator contacts the fluid line to change the volume of the fluid line. In addition, the inlet hole of the first valve is connected to a first fluid supply line (51) that is connected to a fluid bag (80). And the outlet hole of the second valve is connected to a second fluid supply line (52) that is connected to an intravenous injection needle that is intended to penetrate the patient.

[0018] At this time, the inlet hole of the first one-way valve and the outlet hole of the second one-way valve may be exposed toward the outside of the housing (101), and the outlet hole of the first one-way valve and the inlet hole of the second one-way valve may be arranged toward the inside of the housing (101).

[0019] At this time, the piezo actuator is fixed to the housing (101), and when the control unit applies a second voltage to the piezo actuator, the shape of the piezo actuator changes, so that the piezo actuator can be positioned at a position where it changes the shape or volume of the sap line.

[0020] At this time, the second piezo actuator is further included, which is arranged on the opposite side of the piezo actuator with the sap line as the center, and in a first operation mode in which a predetermined first set of voltages is applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator are deformed in a direction in which the volume of the sap line is increased, and in a second operation mode in which a predetermined second set of voltages is applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator can be deformed in a direction in which the volume of the sap line is decreased.

[0021] At this time, in the second operation mode, both the piezo actuator and the second piezo actuator may be deformed in a direction toward the liquid line, and in the first operation mode, both the piezo actuator and the second piezo actuator may be deformed in a direction opposite to the direction toward the liquid line.

[0022] At this time, the piezo actuator may be disposed closer to the second unidirectional valve than the second piezo actuator, and the second piezo actuator may be disposed closer to the first unidirectional valve than the piezo actuator.

[0023] At this time, the sap supply device may further include a sap line support member (175) having a fixed shape and arranged on the opposite side of the piezo actuator with the sap line as the center in order to ensure a change in the volume of the sap line when the second voltage is applied to the piezo actuator.

[0024] According to the present invention, it is possible to provide an intravenous fluid injection device capable of actively controlling the speed of intravenous fluid administered to a patient.

[0025] Figure 1 illustrates a method of using a conventional injection device.

[0026] Figure 2 illustrates the configuration of a sap injection device provided according to one embodiment of the present invention.

[0027] FIG. 3 illustrates examples of the shape of a sap inlet of a sap supply device provided according to one embodiment of the present invention when viewed along the length of the sap supply device.

[0028] Fig. 4 shows a cross-sectional view of the sap supply device taken along line A-A' of Fig. 3.

[0029] Figure 5 illustrates the operating principle of a sap supply device provided according to one embodiment of the present invention.

[0030] Figure 6 illustrates the operating principle of a one-way valve used in one embodiment of the present invention.

[0031] Fig. 7 shows an example of the shape of the piezo actuator presented in Figs. 4 and 5.

[0032] FIG. 8 illustrates various methods of arranging a piezo actuator in a sap supply device provided according to one embodiment of the present invention.

[0033] FIG. 9 illustrates an example of the internal configuration of a sap supply device in a case where only one piezo actuator is arranged inside the sap supply device according to one embodiment of the present invention.

[0034] Figure 10 illustrates the structure of a second fluid supply line of a fluid injection device provided according to an embodiment of the present invention.

[0035] Fig. 11 shows an embodiment modified from Fig. 5.

[0036] Figure 12 illustrates the configuration of an electric circuit and an electronic circuit included in a sap supply device provided according to one embodiment of the present invention.

[0037] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, the present invention is not limited to the embodiments described herein and may be implemented in various other forms. The terminology used herein is intended to aid understanding of the embodiments and is not intended to limit the scope of the present invention. Furthermore, the singular forms used below also include the plural forms, unless the context clearly indicates otherwise.

[0038] Figure 1 illustrates a method of using a conventional injection device.

[0039] The intravenous fluid injection device (100) includes an intravenous fluid bag (80) and an intravenous fluid injection line (50) connected thereto. The intravenous fluid can be supplied to a patient by utilizing the difference in potential energy resulting from the height difference between the two ends of the intravenous fluid injection line (50).

[0040] Figure 2 illustrates the configuration of a sap injection device provided according to one embodiment of the present invention.

[0041] An infusion device (1) provided according to one embodiment of the present invention includes a infusion bag (80), a first infusion supply line (51), a infusion supply device (100), and a second infusion supply line (52).

[0042] One end of the first fluid supply line (51) is connected to a fluid bag (80), and the other end of the first fluid supply line (51) is connected to a fluid inlet (11) of a fluid supply device (100).

[0043] One end of the second fluid supply line (52) is connected to the fluid outlet (12) of the fluid supply device (100), and the other end of the second fluid supply line (52) is connected to a fluid injection needle that is intended to penetrate the patient's body.

[0044] The sap supply device (100) is designed to control the flow of sap flowing from the first sap supply line (51) to the second sap supply line (52).

[0045] Hereinafter, in the sap supply device (100), the direction connecting the sap inlet (11) to the sap outlet (12) is referred to as the longitudinal direction of the sap supply device (100).

[0046] FIG. 3 shows examples of the shape of the sap inlet (11) of the sap supply device (100) provided according to one embodiment of the present invention when viewed along the longitudinal direction of the sap supply device (100).

[0047] As shown in (a) of Fig. 3, when the sap supply device (100) is viewed along its length, the outer profile of the sap supply device (100) may be circular.

[0048] Alternatively, as shown in (b) of FIG. 3, when the sap supply device (100) is viewed along its length, the outer profile of the sap supply device (100) may be a square.

[0049] Alternatively, although not shown, the outer profile of the sap supply device (100) when viewed along its length may have any shape other than a circle or square.

[0050] In the example shown in (a) of Fig. 3, the housing forming the surface of the sap supply device (100) may have a cylindrical shape in which a sap inlet (11) and a sap outlet (12) are formed.

[0051] In the example shown in (b) of Fig. 3, the housing forming the surface of the sap supply device (100) may have a shape in which a sap inlet (11) and a sap outlet (12) are formed in a hexahedral shape that is long in the longitudinal direction of the sap supply device (100).

[0052] Hereinafter, for convenience of explanation, the housing of the sap supply device (100) is described as having the shape of (b) in Fig. 3.

[0053] Fig. 4 shows a cross-sectional view of the sap supply device (100) cut along line A-A' of Fig. 3.

[0054] The drawings presented in Fig. 4 show a cross-section of the sap supply device (100) cut along the first xy plane passing through the center of the sap inlet (11) and the sap outlet (12).

[0055] Figure 4 (a) shows a cross-section of the housing (101) of the sap supply device (100) when the sap supply device (100) is cut along the first xy plane.

[0056] A valve coupling hole (110) to which a valve (130) can be coupled may be formed at both ends along the longitudinal direction of the housing (101) of the sap supply device (100).

[0057] Figure 4 (b) shows a cross-section of the housing (101) of the sap supply device (100) and two valves (130) coupled to the valve coupling hole (110) of the housing (101) when the sap supply device (100) is cut along the first xy plane.

[0058] The first valve (131) is installed in the valve coupling hole (110) at one end of the housing (101) to which the first fluid supply line (51) is connected, thereby providing a fluid inlet (11).

[0059] The second valve (132) is installed in the valve coupling hole (110) at the other end of the housing (101) to which the second fluid supply line (52) is connected, and provides a fluid outlet (12).

[0060] In this specification, the valve, the first valve, and the second valve may be referred to as a unidirectional valve, a first unidirectional valve, and a second unidirectional valve, respectively. Alternatively, the valve, the first valve, and the second valve may be referred to as a check valve, a first check valve, and a second check valve, respectively.

[0061] Figure 4 (c) shows a cross-section of the housing (101) of the sap supply device (100), two valves (130) coupled to the valve coupling hole (110) of the housing (101), and the sap line (150) connected between the two valves (130) when the sap supply device (100) is cut along the first xy plane.

[0062] (d) of FIG. 4 shows a cross-section of the housing (101) of the fluid supply device (100), two valves (130) coupled to the valve coupling holes (110) of the housing (101), the fluid line (150) connected between the two valves (130), and the piezo actuator (160) coupled to the housing (101) when the fluid supply device (100) is cut along the first xy plane.

[0063] The piezo actuator (160) may be referred to herein by other names such as a piezo plate, a piezo element, or a piezo pump actuator.

[0064] In one embodiment, the piezo actuator (160) may be a plate-shaped element regardless of the shape of the cross-section of the housing (101) of the fluid supply device (100) cut along the xz plane. In addition, even if the shape of the cross-section of the fluid line (150) cut along the xz plane is circular, the piezo actuator (160) may have a plate shape. However, the shape of the piezo actuator (160) is not limited to a plate shape, and may have another shape as long as the operational effects of the present invention described below can be achieved.

[0065] A part of the piezo actuator (160) may be fixed to the housing (101) of the sap supply device (100) via a support (170).

[0066] In (d) of Fig. 4, two piezo actuators (160) are shown to be installed. However, depending on the embodiment, one, two, or three or more piezo actuators (160) may be installed.

[0067] Figure 5 illustrates the operating principle of a sap supply device (100) provided according to one embodiment of the present invention.

[0068] The sap supply device (100) may further include a control unit (181), a power unit (182), and a user interface (183) not shown in FIG. 5.

[0069] The control unit (181) may be configured to apply voltage to the piezo actuator (160) according to a predetermined schedule to deform the piezo actuator (160), thereby causing the deformed piezo actuator (160) to deform the shape of the sap line (150).

[0070] For this purpose, the sap line (150) may be made of a flexible material that can be easily deformed by deformation of the piezo actuator (160).

[0071] Figure 5 (a) shows a state in which the voltage applied to the piezo actuator (160) is the first voltage. At this time, the piezo actuator (160) has a first shape that does not deform the liquid line (150).

[0072] FIG. 5 (b) shows a state in which the voltage applied to the piezo actuator (160) is a second voltage different from the first voltage. At this time, the piezo actuator (160) has a second shape that deforms the fluid line (150). When the piezo actuator (160) has the second shape, the piezo actuator (160) presses the fluid line (150), so that the volume of the internal space of the fluid line (150) defined in the fluid supply device (100) is reduced by ΔV. At this time, among the fluids contained in the fluid line (150), the fluid in an amount corresponding to ΔV flows out of the fluid supply device (100) through the fluid outlet (12), and does not flow out of the fluid supply device (100) through the fluid inlet (11). Therefore, an amount of fluid corresponding to the above ΔV can be supplied to the patient.

[0073] In a preferred embodiment, the valve (130) is a one-way valve.

[0074] Figure 6 illustrates the operating principle of a one-way valve used in one embodiment of the present invention.

[0075] The valve (130) includes an inlet hole (1301), an outlet hole (1302), a block member (135), and a rod (136) connected to the block member (135).

[0076] When a force is applied to cause fluid to flow in through the inlet hole (1301), the fluid pushes the block member (135) toward the outlet hole (1302). Conversely, when a force is applied to cause fluid to flow in through the outlet hole (1302), the fluid pushes the block member (135) toward the inlet hole (1301). At this time, the stroke range of the rod (136) may be designed so as not to block the flow of fluid inside the valve (130) when the block member (135) is closest to the outlet hole (1302), and conversely, to block the flow of fluid inside the valve (130) when the block member (135) is closest to the inlet hole (1301). With this principle, a unidirectional valve that blocks bidirectional flow of fluid and allows only unidirectional flow can be provided.

[0077] Figure 6 is intended to illustrate the feasibility of the unidirectional valve used in the present invention. The specific configuration of the unidirectional valve provided according to prior art may have various configurations. Therefore, the structure of the unidirectional valve (130) used in the present invention is not limited to that illustrated in Figure 6.

[0078] Again, referring to FIG. 5, both the first valve (131) and the second valve (132) are arranged in a direction that allows the sap to flow from the sap inlet (11) toward the sap outlet (12), but does not allow it to flow in the opposite direction. Therefore, even if the sap line (150) is contracted as shown in FIG. 5 (b), the sap in the sap line (150), in an amount corresponding to the ΔV, flows out of the sap supply device (100) through the sap outlet (12), but does not flow out of the sap supply device (100) through the sap inlet (11).

[0079] The control unit (181) may be programmed to apply voltage to the piezo actuator (160) so that the piezo actuator (160) switches between the state of (a) of FIG. 5 and the state of (b) of FIG. 5 according to a predetermined schedule.

[0080] In the process of changing from the state of (a) of FIG. 5 to the state of (b) of FIG. 5, a force may be applied to cause some of the sap contained in the sap line (150) to move toward the first valve (131), and another portion to move toward the second valve (132). At this time, the second valve (132) opens and the first valve (131) closes, which can be understood based on the principle presented with reference to FIG. 6.

[0081] Fig. 7 shows an example of the shape of the piezo actuator (160) presented in Figs. 4 and 5.

[0082] The piezo actuator (160) has a shape that can reduce the internal space of the liquid line (150) when the piezo actuator (160) is deformed.

[0083] For example, as shown in (a) of FIG. 7, the length of the piezo actuator (160) is substantially the same as the length of the liquid line (150), and the narrow width of the piezo actuator (160) may be narrower than the diameter of the liquid line (150).

[0084] In contrast, as shown in (b) of FIG. 7, the length of the piezo actuator (160) is substantially the same as the length of the liquid line (150), and the narrow width of the piezo actuator (160) may be larger than the diameter of the liquid line (150).

[0085] In contrast, as shown in (c) of FIG. 7, the length of the piezo actuator (160) may be smaller than the length of the sap line (150).

[0086] That is, it can be understood that the shape and arrangement of the piezo actuator (160) included in the sap supply device (100) are not limited to a specific shape and arrangement as long as they satisfy the condition that can change the volume of the internal space of the sap line (150).

[0087] According to one embodiment of the present invention, since a sap line (150) exists between the piezo actuator (160) and the sap, the piezo actuator (160) does not come into direct contact with the sap. Therefore, there is no possibility of the sap being contaminated by the piezo actuator (160).

[0088] According to one embodiment of the present invention, the sap line (150) is a replaceable part that can be replaced under desired conditions or schedule.

[0089] According to one embodiment of the present invention, since the first sap supply line (51), the first valve (131), the sap line (150), the second valve (132), and the second sap supply line (52) have a structure in which they are connected in series and continuously, there is no branch line in the sap passage, which is advantageous in productivity, manageability, and durability.

[0090] FIG. 8 illustrates various methods of arranging a piezo actuator (160) in a sap supply device (100) provided according to one embodiment of the present invention.

[0091] FIG. 8 shows the outer profile of the sap supply device (100) as seen when looking at the sap supply device (100) along its length as shown in (b) of FIG. 3, and the position of the piezo actuator (160) placed inside it.

[0092] As in the embodiment shown in (a) of FIG. 8, a first piezo actuator (161) and a second piezo actuator (162) may be arranged inside the fluid supply device (100) with the fluid line (150) at the center. Both the first piezo actuator (161) and the second piezo actuator (162) may be arranged so that, when the voltage applied to the first piezo actuator (161) and the second piezo actuator (162) is the second voltage, they all bend toward the fluid line (150), thereby contracting the fluid line (150) and reducing the volume of the internal space of the fluid line (150).

[0093] As in the embodiment shown in (b) of FIG. 8, only one first piezo actuator (161) may be arranged next to the fluid line (150) inside the fluid supply device (100). The first piezo actuator (161) may be arranged so that, when the voltage applied to the first piezo actuator (161) is the second voltage, it bends toward the fluid line (150), thereby contracting the fluid line (150) and reducing the volume of the internal space of the fluid line (150). At this time, in order to ensure the reduction of the internal space of the fluid line (150), a fluid line support member (175) having a predetermined fixed shape may be arranged on the opposite side of the first piezo actuator (161) with the fluid line (150) as the center. The sap line support (175) can perform the function of supporting the sap line (150) so that the other part of the sap line (150) does not move when the modified first piezo actuator (161) presses a part of the sap line (150).

[0094] As in the embodiment shown in (c) of FIG. 8, a first piezo actuator (161), a second piezo actuator (162), a third piezo actuator (163), and a fourth piezo actuator (164) may be arranged inside the sap supply device (100) with the sap line (150) at the center. The first piezo actuator (161), the second piezo actuator (162), the third piezo actuator (163), and the fourth piezo actuator (164) may all be arranged to bend toward the fluid line (150) when the voltage applied to the first piezo actuator (161), the second piezo actuator (162), the third piezo actuator (163), and the fourth piezo actuator (164) is the second voltage, thereby contracting the fluid line (150) and reducing the volume of the internal space of the fluid line (150).

[0095] As can be understood from the examples presented in Fig. 8, one or more piezo actuators (160) may be placed in the internal space of the sap supply device (100) to change the volume of the internal space of the sap line (150).

[0096] FIG. 9 shows an example of the internal configuration of a sap supply device (100) in a case where only one piezo actuator (160) is placed inside the sap supply device (100) provided according to one embodiment of the present invention.

[0097] The structure presented in Fig. 9 is a modification of the structure presented in Fig. 5, and is a concrete embodiment of the example of (b) of Fig. 8.

[0098] Figure 9 (a) shows a state in which the voltage applied to the piezo actuator (160) is the first voltage. At this time, the piezo actuator (160) has a first shape that does not deform the liquid line (150).

[0099] Figure 9 (b) shows a state in which the voltage applied to the piezo actuator (160) is a second voltage different from the first voltage. At this time, the piezo actuator (160) has a second shape that deforms the sap line (150).

[0100] Inside the fluid supply device (100), only one first piezo actuator (161) may be arranged above the fluid line (150). The first piezo actuator (161) may be arranged so that, when the voltage applied to the first piezo actuator (161) is the second voltage, it bends toward the fluid line (150), thereby contracting the fluid line (150) and reducing the volume of the internal space of the fluid line (150). At this time, in order to ensure the reduction of the internal space of the fluid line (150), a fluid line support member (175) having a predetermined fixed shape may be arranged on the opposite side of the first piezo actuator (161) with the fluid line (150) as the center. The sap line support (175) can perform the function of supporting the sap line (150) so that the lower part of the sap line (150) does not move when the modified first piezo actuator (161) presses the upper part of the sap line (150).

[0101] Again, referring to FIGS. 5 and 9, it can be assumed that in the state of FIG. 5 (a) or FIG. 9 (a), the fluid inlet (11) is positioned higher than the fluid outlet (12). In this state, a force due to gravity may act to move the fluid from the fluid inlet (11) toward the fluid outlet (12). In one embodiment of the present invention, in this case, an additional configuration may be further included to prevent the fluid from being supplied to the patient. That is, as in FIG. 5 (b) or FIG. 9 (b), the piezo actuator (160) is deformed to actively control the operation of reducing the internal space of the fluid line (150), so that the fluid is supplied to the patient only during the period of time in which the internal space of the fluid line (150) is reduced, and an additional configuration may be further included to prevent the fluid from being supplied to the patient by gravity, as in the state of FIG. 5 (a) or FIG. 9 (a). This will be described with reference to FIG. 10.

[0102] Figure 10 shows the structure of the second fluid supply line (52) of the fluid injection device (1) provided according to an embodiment of the present invention.

[0103] Figure 10 (a) shows a structure in which a sap supply device (100) is connected to a first sap supply line (51) and a second sap supply line (52).

[0104] The second sap supply line (52) may have a hollow tube shape. In this case, in one embodiment of the present invention, a predetermined membrane (520) may be provided at one point of the second sap supply line (52). The AA' line in (a) of Fig. 10 is a portion slightly deviated from the above-mentioned point.

[0105] Fig. 10 (b) shows an example of a cross-sectional view taken along the line AA` of Fig. 10 (a) as viewed along the x-axis direction. Reference numeral 521 of Fig. 10 (b) indicates a cross-shaped (+) cut line formed in the membrane (520). At this time, the membrane (520) may be made of a flexible material. Fig. 10 (b) shows the shape of the membrane (520) when the fluid in the second fluid supply line (52) does not exert sufficiently large pressure on the membrane (520).

[0106] Figure 10 (c) shows a situation in which, under the condition that the piezo actuator (160) applies a pressure higher than a predetermined threshold value to the infusion line (150) due to the deformation of the piezo actuator (160), the infusion fluid flowing out of the infusion supply device (100) is applied to the cross-shaped cut lines (521) of the membrane (520), and the wing parts defined around the cross-shaped cut lines (521) are bent along the path of the infusion fluid movement, thereby creating a infusion flow passage (522) through which the infusion fluid moves. As a result, the infusion fluid flowing out of the infusion bag (80) can be provided to the patient through the infusion flow passage (522).

[0107] At this time, if the piezo actuator (160) installed in the fluid supply device (100) is not deformed and pressure is not applied to move the fluid from the fluid supply device (100) to the second fluid supply line (52), the fluid may not move through the cross-shaped cutting lines (521) due only to the difference in potential energy caused by the difference in height of the fluid bag (80) of FIG. 2 and the height of the fluid injection needle penetrating the patient's blood vessel.

[0108] Fig. 10(d) shows another example of a cross-sectional view taken along the line AA` of Fig. 10(a) as viewed along the x-axis. At this time, one or more sap movement passages (522) may be formed in the membrane (520). The sap movement passages (522) are small holes formed in the membrane (520). Depending on the specific value of the size of the hole, the sap can move through the sap movement passages (522) only when the sap in the second sap supply line (52) exerts sufficiently large pressure on the membrane (520).

[0109] Fig. 11 shows an embodiment modified from Fig. 5.

[0110] The first piezo actuator (161) is positioned closer to the second valve (132) than the second piezo actuator (162), and the second piezo actuator (162) is positioned closer to the first valve (131) than the first piezo actuator (161).

[0111] The length of each of the first piezo actuator (161) and the second piezo actuator (162) is smaller than the length of the sap line (150).

[0112] On the opposite side of the first piezo actuator (161) with the sap line (150) as the center, a sap line support (175) having a size corresponding to the first piezo actuator (161) is arranged.

[0113] On the opposite side of the second piezo actuator (162) with the sap line (150) as the center, a sap line support (175) having a size corresponding to the second piezo actuator (162) is arranged.

[0114] When using a configuration such as that of Fig. 11, in a configuration in which two piezo actuators are included in the sap supply device (100), there is an advantage in that the deformation of each piezo actuator is not disturbed by the deformation of at least another piezo actuator, and there is an advantage in that the deformation of a pair of piezo actuators can induce the greatest possible change in the volume of the sap line (150).

[0115] Figure 12 shows the configuration of an electric circuit and an electronic circuit included in a sap supply device (100) provided according to one embodiment of the present invention.

[0116] Other above-described components included in the sap supply device (100) are not shown in Fig. 12.

[0117] The sap supply device (100) includes a power supply unit (182), a user interface (183), a control unit (181), and a piezo actuator (160).

[0118] The user interface (183) may include buttons and / or a display device that can be operated by the user. The user can set the dosage of the sap through the user interface (183).

[0119] The control unit (181) may be programmed to determine a time schedule for repeating deformation and return of the piezo actuator (160) according to the set dosage, and to change the voltage applied to the piezo actuator (160) according to the time schedule.

[0120] The power supply unit (182) may include a battery, and in some cases, commercial power other than a battery may be rectified and supplied to the sap supply device (100).

[0121] In addition, in order to more effectively perform the technical implementation of the present invention, the following supplementary configurations or modified forms may also be considered.

[0122] In one embodiment, the operation of the piezo actuator (160) (or a plurality of piezo actuators (161, 162)) included in the intravenous fluid supply device (100) is controlled in a manner to periodically supply a constant amount of intravenous fluid to the patient, but in addition, the control unit (181) may include a series of scheduling algorithms that can control the entire cycle of intravenous fluid infusion based on the timing of voltage application to the piezo actuator (160). In addition to time-based infusion, these algorithms may be designed to be dynamically adjusted based on the patient's condition or the accumulated value of the intravenous fluid infusion amount. In one embodiment of the present invention, the deformation stage (e.g., contraction and return to the original state) of the piezo actuator (160) is divided into state changes along the time axis, and the change in the internal pressure of the intravenous fluid line (150) and the amount of intravenous fluid movement are calculated at each stage and reflected in the quantitative control.

[0123] In one embodiment, the second fluid supply line (52) including the membrane (520) functions as an important safety device to ensure that the fluid is supplied to the patient only when the pressure generated from the fluid supply device (100) is sufficient. Accordingly, it performs a blocking function to prevent the fluid from flowing naturally due to a simple difference in potential energy even without the operation of the fluid supply device (100). In order to prevent a decrease in elastic recovery force or a decrease in durability due to repeated operation of the membrane (520), the material used for the membrane (520) is preferably composed of a polymer-based synthetic material having high elasticity and high recovery characteristics, and maintaining structural stability even under repeated pressure. In addition, the angle, thickness, and distribution of the cutting line (521) can be optimized to more precisely control the opening conditions of the membrane (520).

[0124] In one embodiment, if the power supply (182) includes a battery, safety mechanisms may be added to address prolonged use or battery depletion. Specifically, the device may be configured to provide a warning signal when the remaining battery level falls below a certain level, or to enter a protection mode that temporarily suspends intravenous fluid administration. Furthermore, the user interface (183) may be configured to include a manual mode switching function, allowing the user to administer intravenous fluids in an emergency even in the event of a power failure.

[0125] In one embodiment, the piezoelectric actuator (160) and the infusion line (150) included in the infusion device (100) may be structurally modularized and designed to be replaceable after use. This is advantageous in terms of infection prevention, hygiene maintenance, and device maintenance, and can significantly improve user convenience, especially when repeatedly used in medical settings. In this regard, the control unit (181) may generate a warning signal to notify the user of the need for replacement when a certain usage time or number of injections has been reached, and this may be provided through an indicator light, an alarm sound, or a display message on the user interface (183).

[0126] In one embodiment, the infusion device (1) of the present invention can be expanded to include a smart function that adjusts the infusion rate based on the patient's biometric information in the future. For example, a wireless communication module (not shown in the drawing) capable of receiving data such as the patient's heart rate, blood pressure, and oxygen saturation can be mounted on the infusion supply device (100), and an artificial intelligence-based control algorithm that analyzes these biometric signals and adjusts the infusion pattern in real time can be included in the control unit (181). This function is significant in that it allows for more precise control of the infusion rate and dosage, and enables customized infusion according to the patient's condition.

[0127] By utilizing the embodiments of the present invention described above, those skilled in the art will be able to easily implement various changes and modifications without departing from the essential characteristics of the present invention. The content of each claim may be combined with other claims that are not in a citation relationship within the scope of this specification, as long as it is understood.

[0128] [Explanation of symbols]

[0129] 1: IV injection device

[0130] 11: Sap inlet

[0131] 12: Sap outlet

[0132] 50: Sap supply line

[0133] 51: First sap supply line

[0134] 52: Second sap supply line

[0135] 80: IV bag

[0136] 100: Sap supply device

[0137] 101: Housing (101)

[0138] 110: Valve coupling hole

[0139] 130: Valve

[0140] 131: Valve 1

[0141] 132: Second valve

[0142] 135: Block Member

[0143] 136: rod

[0144] 150: Sap line

[0145] 160: Piezo actuator

[0146] 161: First piezo actuator

[0147] 162: Second piezo actuator

[0148] 170: Support

[0149] 175: Sap line support

[0150] 181: Control Unit

[0151] 182: Power supply

[0152] 183: User Interface

[0153] 1301: Inlet Hole

[0154] 1302: Outlet Hall

Claims

1. Includes a first sap supply line (51), a second sap supply line (52), and a sap supply device (100); The above sap supply device is, Housing (101); A first one-way valve (131) coupled to the first end of the housing; A second one-way valve (132) coupled to the second end of the housing; A liquid line (150) connecting the outlet hole of the first one-way valve and the inlet hole of the second one-way valve; piezo actuator (161); and Control unit (161); Includes, When the control unit changes the voltage applied to the piezo actuator, the shape of the piezo actuator changes, and the piezo actuator comes into contact with the fluid line to change the volume of the fluid line. The inlet hole of the above first valve is connected to the second end of the above first fluid supply line, The outlet hole of the second valve is connected to the first end of the second fluid supply line. Infusion pump (1).

2. In paragraph 1, The inlet hole of the first one-way valve and the outlet hole of the second one-way valve are exposed toward the outside of the housing, The outlet hole of the first one-way valve and the inlet hole of the second one-way valve are arranged toward the inside of the housing. IV infusion device.

3. In paragraph 1, The first end of the above first sap supply line is connected to the sap bag (80), The second end of the second fluid supply line is connected to an intravenous injection needle that is intended to penetrate the patient. IV infusion device.

4. In paragraph 1, The above piezo actuator, is fixed to the above housing, and When the control unit applies a second voltage to the piezo actuator, the shape of the piezo actuator changes, and the piezo actuator is positioned at a position to change the shape or volume of the sap line. IV infusion device.

5. In paragraph 4, The above sap supply device further includes a second piezo actuator arranged on the opposite side of the piezo actuator with the sap line as the center, In a first operation mode in which a predetermined first set of voltages is applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator are deformed in a direction that increases the volume of the sap line, In a second operating mode in which a second set of predetermined voltages is applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator are deformed in a direction that reduces the volume of the sap line. IV infusion device.

6. In paragraph 5, In the second operation mode, both the piezo actuator and the second piezo actuator are configured to deform in a direction toward the sap line, In the above first operation mode, both the piezo actuator and the second piezo actuator are configured to deform in the opposite direction toward the sap line. IV infusion device.

7. In paragraph 5, The above piezo actuator is positioned closer to the second unidirectional valve than the second piezo actuator, The second piezo actuator is positioned closer to the first unidirectional valve than the piezo actuator. IV infusion device.

8. In paragraph 4, The above sap supply device is, In order to ensure a change in the volume of the sap line when the second voltage is applied to the piezo actuator, a sap line support member (175) having a fixed shape is arranged on the opposite side of the piezo actuator with the sap line as the center. including more, IV infusion device.

9. In paragraph 1, A membrane (520) is provided at a point inside the second sap supply line. The above membrane has a fluid passage (522) formed therein, which allows only fluid that provides a pressure higher than a predetermined threshold value to pass through. IV infusion device.

10. In paragraph 1, A flexible membrane (520) having one or more cutting lines (521) formed therein is provided at a point inside the second sap supply line. IV infusion device.

11. Housing; A first one-way valve (131) coupled to the first end of the housing; A second one-way valve (132) coupled to the second end of the housing; A liquid line (150) connecting the outlet hole of the first one-way valve and the inlet hole of the second one-way valve; piezo actuator (161); and Control unit (161); Includes, When the control unit changes the voltage applied to the piezo actuator, the shape of the piezo actuator changes, and the piezo actuator comes into contact with the fluid line to change the volume of the fluid line. The inlet hole of the above first valve is connected to the first fluid supply line (51) which is connected to the fluid bag (80), The outlet hole of the second valve is connected to a second fluid supply line (52) which is connected to an intravenous injection needle that is intended to penetrate the patient. Sap supply device (100).

12. In paragraph 11, The inlet hole of the first one-way valve and the outlet hole of the second one-way valve are exposed toward the outside of the housing, The outlet hole of the first one-way valve and the inlet hole of the second one-way valve are arranged toward the inside of the housing. Sap supply device.

13. In paragraph 11, The above piezo actuator, is fixed to the above housing, and When the control unit applies a second voltage to the piezo actuator, the shape of the piezo actuator changes, and the piezo actuator is positioned at a position to change the shape or volume of the sap line. Sap supply device.

14. In paragraph 13, It further includes a second piezo actuator arranged on the opposite side of the piezo actuator with the sap line as the center, In a first operation mode in which a predetermined first set of voltages is applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator are deformed in a direction that increases the volume of the sap line, In a second operating mode in which a second set of predetermined voltages is applied to the piezo actuator and the second piezo actuator, the piezo actuator and the second piezo actuator are deformed in a direction that reduces the volume of the sap line. Sap supply device.

15. In paragraph 13, The above sap supply device is, In order to ensure a change in the volume of the sap line when the second voltage is applied to the piezo actuator, a sap line support member (175) having a fixed shape is arranged on the opposite side of the piezo actuator with the sap line as the center. including more, Sap supply device.

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