Air-filled liquid medicine pumping device and liquid medicine injection device

Abstract

An air-filled liquid medicine pumping device according to an embodiment of the present disclosure includes a chamber that forms an injection flow path connecting an air-filled internal space with the outside, the chamber having an inner upper end surface that defines an upper end of the internal space, and an inner protrusion that protrudes downward from the inner upper end surface and has a connecting hole that is one end of the injection flow path at its protruding end, and a plunger that forms the internal space together with the chamber, is configured to be movable in the vertical direction along an inner side surface of the chamber to change the volume of the internal space, and has an upper side surface that forms an insertion groove that is recessed downward so that the inner protrusion can be inserted, and the inner upper end surface and the upper side surface are spaced apart from each other.

Description

[Technical field]

[0001] The present disclosure relates to an air-filled liquid chemical pumping device, a liquid chemical injection device, and a method for manufacturing an air-filled liquid chemical pumping device. [Background technology]

[0002] A liquid medicine injection device is known that injects a liquid medicine (e.g., an injection liquid) into a patient in order to supply the liquid medicine to the patient. By using the liquid medicine injection device, the liquid medicine in a predetermined storage space flows into the patient's body through a passage (e.g., an internal space of a tube and a syringe needle) connected to the patient.

[0003] A conventional drug solution injector includes a chamber that forms the above-mentioned storage space inside, and a plunger that changes the volume of the above-mentioned storage space by sliding along the inner side of the chamber. When the plunger slides in a predetermined pressure direction relative to the chamber to reduce the volume of the storage space, the drug solution in the storage space moves along the above-mentioned passage and flows into the patient's body. When the plunger slides to the maximum extent relative to the chamber in the above-mentioned pressure direction, the drug solution remains in the above-mentioned passage, and the remaining drug solution is generally discarded without being injected into the patient's body. That is, a portion of the total amount of drug solution contained in the storage space of the drug solution injector flows into the patient's body, but the remainder remains unused in the above-mentioned passage. Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned conventional liquid injectors have a problem in that a considerable amount of liquid remaining in the passage is wasted. The present disclosure aims to solve such problems of the conventional liquid injectors. [Means for solving the problem]

[0005] One aspect of the present disclosure provides an embodiment of an air-filled liquid medicine pumping device. The liquid medicine injection device according to a representative embodiment includes a chamber that forms an injection flow path connecting an air-filled internal space with the outside, and has an inner upper end surface that defines an upper end of the internal space, and an inner protrusion that protrudes downward from the inner upper end surface and has a connection hole that is one end of the injection flow path at its protruding end, and a plunger that forms the internal space together with the chamber, is configured to be movable vertically along an inner side surface of the chamber to change the volume of the internal space, and has an upper side surface that forms an insertion groove that is recessed downward so that the inner protrusion can be inserted, and the inner upper end surface and the upper side surface are spaced apart from each other.

[0006] In one embodiment, an upper end of the plunger may be located below a lower end of the inner projection.

[0007] In one embodiment, the chamber may be recessed upward along a periphery of the inner protrusion to form an air collection groove that constitutes a part of the internal space.

[0008] In one embodiment, the plunger may include an insertion portion that is formed to protrude upward along the periphery of the insertion groove and is configured to be able to engage with the air collection groove when the plunger moves upward.

[0009] In one embodiment, the air filled in the interior space may be sterile air.

[0010] In one embodiment, the inner space may be manufactured in a state where it is filled with air.

[0011] In one embodiment, the device may further include a pressure operating portion configured to be able to pressurize the plunger so that the plunger moves upward.

[0012] Another aspect of the present disclosure provides an embodiment of a drug solution injection device. A drug solution injection device according to a representative embodiment may include the above air-filled drug solution pumping device, an injection part fixing device configured to be connectable to an injection part configured to be inserted into a patient's skin and inject a drug solution and to form a guide flow channel configured to guide a flow of the drug solution to the injection part, an air filter configured to be connected to the injection part fixing device and to form a filter flow channel connected to an upstream end of the guide flow channel to guide the flow of the drug solution to the guide flow channel and to filter air in the drug solution and discharge it to the outside, and a connecting pipe unit that connects a downstream end of the injection flow channel of the air-filled drug solution pumping device to an upstream end of the filter flow channel of the air filter and forms a connecting flow channel configured to guide the flow of the drug solution.

[0013] In one embodiment, the volume of the internal space located above a virtual horizontal line tangent to the protruding end of the inner protrusion may be greater than or equal to the sum of the volume of the injection channel and the volume of the connecting channel.

[0014] In one embodiment, the sum of the volume of the filter channel and the volume of the guide channel may be smaller than the sum of the volume of the injection channel and the volume of the connecting channel.

[0015] In one embodiment, the injection portion fixing device may include a fixed body forming the guide channel, and a support leg configured to support the fixed body against the patient's skin. Effect of the Invention

[0016] According to an embodiment of the present disclosure, the structure of the liquid medicine pumping device allows air to push out any liquid medicine remaining in the connecting tube, thereby significantly reducing the amount of liquid medicine remaining in the connecting tube after use of the liquid medicine pumping device.

[0017] According to one embodiment of the present disclosure, by providing an air-filled liquid medicine pumping device with an internal space filled with air, even when liquid medicine is injected into the internal space, air can be ensured to be present in the internal space to push out the liquid medicine remaining in the connecting tube after use of the liquid medicine injection device.

[0018] According to one embodiment of the present disclosure, even if the plunger slides upward relative to the chamber, air remains trapped in the air collecting groove of the chamber, so that after the liquid medicine flows out of the internal space of the liquid medicine pumping device, the trapped air can be induced to flow out of the internal space and push out the liquid medicine remaining in the connecting tube.

[0019] According to one embodiment of the present disclosure, the air in the internal space can be induced to be pressurized by the plunger just before the plunger slides maximally upward into the chamber.

[0020] According to one embodiment of the drug solution injection device of the present disclosure, air trapped around the inner protrusion inside the chamber can push out the drug solution in the injection flow path of the chamber and the connecting flow path of the connecting tube portion to the maximum extent, and the air that has pushed out the drug solution can be filtered by the air filter before it enters the patient's body.

[0021] According to one embodiment of the drug solution injection device of the present disclosure, by making the volume of the internal space located above an imaginary horizontal line tangent to the protruding end of the inner protrusion greater than or equal to the sum of the volume of the injection flow path and the volume of the connecting flow path, the drug solution in the injection flow path and the connecting flow path, which are the flow paths upstream of the air filter, can be all pushed out by the air trapped around the inner protrusion inside the chamber. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a conceptual diagram showing the entire system of a drug solution infusion set (1, 2). [Diagram 2] 2 is an enlarged cross-sectional view of the air-filled liquid chemical pumping device of FIG. 1. [Diagram 3] 3 is an enlarged cross-sectional view showing a state in which the air-filled liquid chemical pumping device of FIG. 2 is filled with liquid chemical. FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view showing a state in which the plunger in FIG. 3 is moving upward. [Diagram 5] 4 is a flow chart illustrating a method of operation of the air-filled liquid chemical pumping device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The embodiments of the present disclosure are illustrated for the purpose of explaining the technical idea of ​​the present disclosure, and the scope of the rights of the present disclosure is not limited to the embodiments presented below or the specific explanations of these embodiments.

[0024] All technical and scientific terms used in this disclosure have the meanings commonly understood by those of ordinary skill in the art to which this disclosure belongs, unless otherwise specified. All terms used in this disclosure are selected for the purpose of more clearly describing this disclosure, and are not selected to limit the scope of the rights related to this disclosure.

[0025] As used in this disclosure, terms such as "including," "comprising," "having," and the like, should be understood as open-ended terms that include the possibility of including other embodiments, unless otherwise indicated in the phrase or sentence in which the term appears.

[0026] As used in this disclosure, singular terms can include plural meanings unless otherwise specified, and this also applies to singular terms recited in the claims.

[0027] The terms "first", "second", etc. used in this disclosure are intended to distinguish multiple elements from one another, and do not limit the order or importance of the elements.

[0028] In this disclosure, when a component is referred to as being "coupled" or "connected" to another component, it may be understood that the component is directly coupled or connected to the other component, or that the component is coupled or connected via a new, separate component.

[0029] The terms "upstream" and "downstream" used in this disclosure are defined based on the direction in which the liquid medicine flows when the air-filled liquid medicine pumping device 100 pressurizes the liquid medicine. Specifically, the direction of the arrow F in Fig. 1 is defined as the downstream direction, and the opposite direction to the downstream direction is defined as the upstream direction.

[0030] In the present disclosure, directional terms such as "upper" and "top" refer to the direction in which a plunger slides relative to a chamber to reduce the volume of the internal space of the liquid medicine pumping device in the accompanying drawings, and directional terms such as "lower" and "bottom" refer to the opposite direction. An upper direction U and a lower direction D are shown in the drawings.

[0031] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components are denoted by the same reference numerals. In addition, in the following description of the embodiments, duplicated descriptions of identical or corresponding components will be omitted. However, even if a description of a component is omitted, it is not intended that such a component is not included in the embodiment.

[0032] Fig. 1 is a conceptual diagram showing the entire system of a liquid medicine injection set 1, 2. Referring to Fig. 1, the liquid medicine injection set 1, 2 according to an embodiment of the present disclosure includes a liquid medicine injection device 1 and an injection part 2 configured to be connectable to the liquid medicine injection device 1. For example, after filling a priming liquid in a connecting tube part 300 described below with an end cap (not shown) having a hydrophobic filter connected to an injection part fixing device 700 described below, the end cap can be separated from the injection part fixing device 700, and the injection part 2 can be connected to the injection part fixing device 700.

[0033] The injection unit 2 is configured to be inserted into the skin of a patient to inject a medicinal solution. The injection unit 2 may include an injection needle 2a or a catheter. The injection unit 2 according to one embodiment includes an injection needle 2a and an injection support part 2b that supports the injection needle 2a. The injection unit 2 includes a corresponding coupling part 2c configured to be coupled to the injection coupling part 710 of the injection unit fixing device 700. The injection unit 2 may be configured by sequentially connecting the injection needle 2a, the injection support part 2b, and the corresponding coupling part 2c.

[0034] The liquid injection device 1 includes an air-filled liquid pumping device 100. The liquid injection device 1 includes a connecting tube unit 300 connected to an injection flow path 110p (described later) of the air-filled liquid pumping device 100. The liquid injection device 1 may further include an air filter 500 coupled to a downstream end of the connecting tube unit 300. The liquid injection device 1 may further include an injection unit fixing device 700 coupled to a downstream end of the air filter 500.

[0035] The medicinal liquid flows into the patient's body by pressurization in the air-filled type medicinal liquid pumping device 100. The medicinal liquid may flow from the air-filled type medicinal liquid pumping device 100 through the connecting tube unit 300, the air filter 500, the injection unit fixing device 700, and the injection unit 2 in this order into the patient's body.

[0036] The air-filled liquid medicine pumping device 100 includes a chamber 110 configured to accommodate the liquid medicine. The chamber 110 forms an internal space 100s together with the plunger 130. The liquid medicine may be stored in the internal space 100s. The chamber 110 may include a coupling part 114 coupled to the connection tube part 300. The coupling part 114 may be coupled to the port connection part 333 of the port part 330. The coupling part 114 may be formed on the upper side of the chamber 110. The coupling part 114 may be composed of a tubular member extending in the vertical direction. The coupling part 114 may form an injection flow path 110p.

[0037] The air-filled liquid medicine pumping device 100 is configured to pressurize the liquid medicine. The air-filled liquid medicine pumping device 100 includes a plunger 130 that pressurizes the liquid medicine in the chamber 110. The plunger 130 can pressurize the liquid medicine in the chamber 110 by moving in an upward direction. The plunger 130 moves in a downward direction while the liquid medicine is being filled inside the chamber 110.

[0038] The connecting pipe unit 300 forms a connecting flow path 300p configured to guide the flow of the liquid medicine. The connecting pipe unit 300 can guide the movement of the liquid medicine from the air-filled type liquid medicine pumping device 100 to the air filter 500. The connecting pipe unit 300 is configured to allow the liquid medicine flowing out of the air-filled type liquid medicine pumping device 100 due to pressurization in the air-filled type liquid medicine pumping device 100 to flow through the connecting pipe unit 300. The connecting flow path 300p connects a downstream end of the injection flow path 110p of the air-filled type liquid medicine pumping device 100 to an upstream end of the filter flow path 500p of the air filter 500.

[0039] The connecting pipe section 300 includes a connecting pipe 310 that forms at least a portion of the connecting flow passage 300p. The connecting pipe section 300 may further include a port section 330 that forms a portion of the connecting flow passage 300p. For example, the port section 330 may form a portion of the flow passage of the upstream portion of the connecting flow passage 300p, and the connecting pipe 310 may form the remaining portion of the connecting flow passage 300p.

[0040] The port portion 330 is configured to allow the liquid medicine to be filled into the liquid medicine pumping device 100. The liquid medicine may flow into the liquid medicine pumping device 100 from the outside through the port portion 330. The liquid medicine may flow into the internal space 100s of the liquid medicine pumping device 100 through the port portion 330. The port portion 330 may include a port inflow portion 331 configured to allow the liquid medicine to flow in from the outside. The liquid medicine is filled into the internal space 100s of the liquid medicine pumping device 100 through the port inflow portion 331, and the plunger 130 may move in a downward direction.

[0041] The port unit 330 may be connected to the chamber 110 and the connecting pipe 310. The port unit 330 is disposed between the chamber 110 and the connecting pipe 310 and may connect the chamber 110 to the connecting pipe 310. The port unit 330 may include a port extension unit 332 connected to an upstream end of a first connecting unit 310 of the connecting pipe 310 described below. The medicinal solution in the internal space 100s of the chamber 110 may flow into the connecting pipe 310 through the port extension unit 332 of the port unit 330.

[0042] The port unit 330 may include a port connection part 333 connected to the chamber 110. The port connection part 333 may be connected to the coupling part 114 of the chamber 110. The port connection part 333 may be configured to extend in the vertical direction in a cylindrical shape. When the coupling part 114 is coupled to the port connection part 333, the outer surface of the coupling part 114 and the inner surface of the port connection part 333 may be in contact with each other.

[0043] The port unit 330 may include an inflow opening / closing unit (not shown) that adjusts the inflow of the medicinal liquid to the port inflow unit 331. When the medicinal liquid in the internal space 100s of the chamber 110 flows into the connecting pipe 310 through the port extension unit 332 of the port unit 330, the inflow opening / closing unit closes the port inflow unit 331 to prevent the medicinal liquid from flowing out to the outside.

[0044] The upstream end of the connecting pipe 310 is connected to the port extension portion 332 of the port portion 330, and the medical solution in the internal space 100s of the chamber 110 can be moved in the downstream direction of the connecting pipe 310. The connecting pipe 310 connects the port portion 330 and the air filter 500.

[0045] The air filter 500 is configured to filter air contained in the medicinal liquid and discharge it to the outside. The air filter 500 is coupled to the downstream end of the connecting pipe 310. The air filter 500 is coupled to the injection part fixing device 700. The air filter 500 forms a filter channel 500p. The filter channel 500p is connected to the upstream end of a guide channel 700p (described later) of the injection part fixing device 700, and is configured to guide the flow of the medicinal liquid through the guide channel 700p. The upstream end of the filter channel 500p is connected to the downstream end of the connecting channel 300p.

[0046] The air filter 500 may include a filter casing 510 connected to the connecting pipe 310, and a hydrophobic filter 520 disposed in the filter casing 510. The hydrophobic filter 520 is configured to allow air to pass through and prevent liquid from passing through. The air filter 500 is formed with an air vent (not shown) configured to allow air filtered by the hydrophobic filter 520 to be discharged to the outside.

[0047] The injection unit fixing device 700 is configured to be connectable to the injection unit 2. For example, the injection unit fixing device 700 and the injection unit 2 may be connected to each other by a screw. The injection unit fixing device 700 forms a guide channel 700p configured to guide the flow of the medicinal liquid to the injection unit 2. An upstream end of the guide channel 700p is connected to a downstream end of the filter channel 500p.

[0048] The injection unit fixing device 700 includes a fixed body 720 that forms a guide channel 700p. The injection unit fixing device 700 includes a filter coupling part 730 that is coupled to the air filter 500. The injection unit fixing device 700 includes an injection coupling part 700 configured to be coupled to the injection unit 2. The injection unit fixing device 700 may include a support leg 750 configured to support the fixed body 720 against the patient's skin. For example, the support leg 750 is fixed to a member (not shown) that is attached to the patient's skin, and the injection unit fixing device 700 can be disposed at a fixed position and angle with respect to the patient's skin.

[0049] Fig. 2 is an enlarged cross-sectional view of the air-filled liquid drug pumping device of Fig. 1. Referring to Fig. 2, the air-filled liquid drug pumping device 100 may include a chamber 110 and a plunger .

[0050] The chamber 110 may form an injection channel 110p connecting the air-filled internal space 100s to the outside of the chamber 110. The injection channel 110p may be formed by the coupling part 114 of the chamber 110. The injection channel 110p is connected to the connecting pipe part 300. An upstream end of the injection channel 110p is connected to the internal space 100s of the chamber 110. An upstream end of the injection channel 110p is a connecting hole 111h described below. A downstream end of the injection channel 110p is connected to an upstream end of the connecting channel 300p. The injection channel 110p may be connected to the connecting pipe 310 via the port part 330. The drug solution flowing in through the port inlet part 331 of the port part 330 may flow into the internal space 100s of the chamber 110 through the injection channel 110p. The injection channel 110p may be located on the upper side of the chamber 110. The injection channel 110p may be formed in a tubular shape extending in the vertical direction.

[0051] The chamber 110 may have an inner upper end surface 113 that defines an upper end of the internal space 100s. The chamber 110 may have an inner protrusion 111 that protrudes downward from the inner upper end surface 113. The inner protrusion 111 may protrude downward from a central portion of the inner upper end surface 113. A connection hole 111h that is one end of the injection flow path 110p may be formed in the inner protrusion 111. The connection hole 111h may be formed at a protruding end of the inner protrusion 111. An external drug solution may flow into the internal space 100s of the chamber 110 through the connection hole 111h. The drug solution in the internal space 100s may flow out to the outside through the connection hole 111h.

[0052] The chamber 110 may form an air collection groove 111g constituting a part of the internal space 100s. The air collection groove 111g may be formed by recessing upward along the periphery of the inner protrusion 111. The air collection groove 111g may surround the inner protrusion 111. The level of the inner upper end surface 113 forming the air collection groove 111g may be lower toward the center outer direction OR of the inner upper end surface 113. For convenience of explanation in this disclosure, an imaginary central axis C is defined that extends while penetrating the connection hole 111h in the vertical direction, and the central outer direction OR is defined as a direction away from the central axis C. When air A and medicinal liquid L are present in the internal space 100s of the chamber 110, the air A may be trapped in the air collection groove 111g until just before the plunger 130 moves to the maximum upward position.

[0053] The plunger 130 may form an internal space 100s together with the chamber 110. The plunger 130 may be configured to be movable along the inner surface of the chamber 110. The plunger 130 may be configured to be movable in an up-down direction to change the volume of the internal space 100s. When the medicinal liquid flows into the internal space 100s, the plunger 130 may move in a downward direction to increase the volume of the internal space 100s. When the medicinal liquid flows out of the internal space 100s, the plunger 130 may move in an upward direction to decrease the volume of the internal space 100s.

[0054] The plunger 130 may have an upper surface 131 that forms an insertion groove 131g. The insertion groove 131g may be recessed downward. The insertion groove 131g may be recessed so that the inner protrusion 111 can be inserted. The insertion groove 131g may be formed in a central portion of the upper surface 131 of the plunger 130.

[0055] An upper surface 131 of the plunger 130 may be spaced apart from an inner upper end surface 113 of the chamber 110. The upper surface 131 of the plunger 130 and the inner upper end surface 113 of the chamber 110 may be spaced apart from each other to form an internal space 100s. Air may be filled into the internal space 100s through the port portion 330. The filled air may be located in the air collecting groove 111g.

[0056] The inner upper end surface 113 of the chamber 110 and the plunger 130 may define an internal space 100s. The upper end of the internal space 100s may be defined by the inner upper end surface 113. The lower end of the internal space 100s may be defined by the upper surface 131 of the plunger 130. The air-filled liquid medicine pumping device may be manufactured in a state in which the internal space 100s is filled with air. When the liquid medicine flows into the internal space 100s, air and the liquid medicine may coexist in the internal space 100s. A part of the air filled in the internal space 100s may flow out to the connecting pipe 310, flow into the air filter 500, and be discharged to the outside. The air may be trapped in the air collecting groove 111g of the chamber 110. The air trapped in the air collecting groove 111g may be used to push the liquid medicine remaining in the connecting pipe, as described below.

[0057] The air filled in the internal space 100s may be sterilized air, which can reduce the possibility of causing health problems to a patient who is injected with the medicinal liquid.

[0058] The plunger 130 may include an insertion portion 131a configured to be able to mesh with the air collecting groove 111g. The insertion portion 131a may be formed to protrude upward along the periphery of the insertion groove 131g. The insertion portion 131a may surround the insertion groove 131g. The level of the insertion portion 131a may become lower toward the center outer side direction OR. The insertion portion 131a may be configured to be able to mesh with the air collecting groove 111g when the plunger 130 moves upward. When the plunger 130 moves upward and meshes with the air collecting groove 111g, the air present in the internal space 100s may flow out along the injection flow path 110p.

[0059] In a state where the internal space is filled with air after the manufacturing is completed, it is preferable that the upper end of plunger 130 is located lower than the lower end of inner protrusion 111. This allows air collecting groove 111g to have a sufficient volume and trap a sufficient amount of air in air collecting groove 111g. The effect of pushing out the remaining drug solution can be further improved by the air sufficiently trapped in air collecting groove 111g.

[0060] In one embodiment, the air-filled liquid medicine pumping device 100 may include a pressure actuator 150 that provides power to move the plunger 130 in an upward direction. As one example, the pressure actuator 150 may be configured to pressurize the liquid medicine in the chamber 110 using volumetric expansion due to gas activation. As another example, the pressure actuator 150 may provide a portion that can be held by a user, allowing the plunger 130 to move in the upward direction with the force of the user.

[0061] As another example (not shown), the plunger 130 may be configured to pressurize the medicinal liquid using the elastic force of an elastic body such as a balloon. In this case, the plunger 130 may be configured to pressurize the medicinal liquid in the balloon.

[0062] Although the pressurizing unit 150 is shown in FIG. 1, the air-filled liquid medicine pumping device does not have to include a pressurizing unit. As an example, the air-filled liquid medicine pumping device may be manufactured without including a pressurizing unit. In this case, a liquid medicine manufacturer or user can directly connect a separate pressurizing unit for use.

[0063] The method for manufacturing the air-filled liquid medicine pumping device may include a step of forming air in the internal space 100s of the chamber 110. The chamber 110 may be manufactured in a state in which an inner upper end surface 113 of the chamber 110 and an upper surface 131 of the plunger 130 are spaced apart from each other so that the internal space 100s of the chamber 110 is filled with air.

[0064] When the internal space 100s is filled with air and a liquid medicine is injected into the internal space 100s, air is inevitably present in the internal space 100s. When the plunger 130 rises to cause a part of the liquid medicine in the internal space 100s to flow into the injection flow path 110p, even if a part of the air in the internal space 100s flows out through the injection flow path 110p, the remaining part of the air in the internal space 100s is trapped in the air collecting groove 111g and remains in the internal space 100s. When the liquid medicine is completely flowed out from the internal space 100s, the air remaining in the air collecting groove 111g is pushed by the insertion part 131a of the plunger 130 and can flow from the air collecting groove 111g to the injection flow path 110p (see the arrow in FIG. 4). The air remaining in the air collecting groove 111g can push the remaining liquid medicine in the injection flow path 110p and the connecting flow path 300p. This significantly reduces the amount of liquid medicine remaining in the connecting pipe after use of the liquid medicine injector. The volume of the air collecting groove 111g and the amount of air filled therein may be adjusted based on the volume of the flow path of the connecting pipe. The specific details will be described later.

[0065] The upper end of the plunger 130 may be manufactured to be located lower than the lower end of the inner protrusion 111. By positioning the upper end of the plunger 130 lower than the lower end of the inner protrusion 111 and allowing a sufficient amount of air to be filled in the internal space 100s, a sufficient amount of air can be induced to be trapped in the air collecting groove 111g located above the lower end of the inner protrusion 111.

[0066] Fig. 3 is an enlarged cross-sectional view for explaining an air-filled liquid medicine pumping device, and Fig. 4 is an enlarged cross-sectional view showing a state in which the plunger of Fig. 3 has moved upward.

[0067] Hereinafter, a method of operating the air-filled liquid chemical pumping device will be described with reference to FIGS.

[0068] An operating method of the air-filled liquid medicine pumping device may include a step (S1) of injecting the liquid medicine into the internal space 100s, a step (S2) of discharging the liquid medicine from the internal space 100s, and a step (S3) of residual air pushing out the liquid medicine.

[0069] In the step (S1), the medicinal liquid flowing in through the port unit 330 may flow into the internal space 100s of the chamber 110 through the injection passage 110p. The medicinal liquid and air may coexist in the internal space 100s of the chamber 110. While the medicinal liquid is being filled into the internal space 100s of the chamber 110, the plunger 130 moves downward, and the volume of the internal space 100s increases.

[0070] 3, the plunger 130 moves upward, and the liquid medicine in the internal space 100s is discharged to the outside through the injection passage 110p. Even when the plunger 130 moves upward, the air located in the air collecting groove 111g remains there instead of being discharged to the outside through the injection passage 110p.

[0071] In step S2, when the medicinal liquid is discharged to the outside, a portion of the air present in the internal space 100s (i.e., air not trapped in the air collecting groove) may be discharged to the connecting flow path 300p together with the medicinal liquid. The air discharged together with the medicinal liquid may flow into the air filter 500 through the connecting pipe part 300. The gas flowing into the air filter 500 may be discharged to the outside through the above-mentioned air vent. Even if a portion of the air is discharged from the internal space 100s, the state in which the air A is trapped in the air collecting groove 111g of the internal space 100s may be maintained.

[0072] In step S2, when the plunger 130 continues to move upward, all of the liquid medicine in the internal space 100s may flow out through the injection passage 110p, but air remains in the air collecting groove 111g of the internal space 100s.

[0073] In step S3, as shown in Fig. 4, the plunger 130 moves upward, causing the remaining air in the internal space 100s to flow out into the injection passage 110p (see the arrow in Fig. 4). The air flowing out into the injection passage 110p pushes out the liquid medicine remaining in the injection passage 110p, and also pushes out the liquid medicine remaining in the injection passage 110p and the connecting passage 300p. This allows the user of the liquid injection device 100 to use the liquid medicine remaining in the injection passage 110p and the connecting pipe 310, and significantly reduces the loss of the liquid medicine.

[0074] 1 and 3, in one embodiment, the volume of the internal space 110s located above a virtual horizontal line that contacts the protruding end of the inner protrusion 111 (hereinafter, the trap volume) may be equal to or greater than the sum of the volume of the injection flow channel 110p and the volume of the connecting flow channel 300p. Here, the virtual horizontal line means, for example, the same line as the water surface line of the medicinal liquid L in FIG. 3, and the trap volume means, for example, the same volume as the volume of air trapped in the air collecting groove 111g in FIG. 3. Thus, in the final stage of injecting the medicinal liquid into the patient, air equivalent to the trap volume can push out all the medicinal liquid remaining in the injection flow channel 110p and the connecting flow channel 300p, and the air that has pushed out the medicinal liquid can be filtered by the air filter 500 before entering the patient's body.

[0075] In addition, the sum of the volume of the filter flow channel 500p of the air filter 500 and the volume of the guide flow channel 700p of the injection unit fixing device 700 may be smaller than the sum of the volume of the injection flow channel 110p and the volume of the connection flow channel 300p. Since the air filter 500 exhausts air to the outside, the medicinal liquid remaining in the medicinal liquid flow channel downstream of the air filter 500 cannot be pushed out by the trapped air described above, but by reducing the volume of the filter flow channel 500p and the volume of the guide flow channel 700p, the amount of medicinal liquid remaining in the flow channel and discarded can be minimized.

[0076] Although the technical idea of ​​the present disclosure has been described above by way of some embodiments and examples shown in the accompanying drawings, it is clear to those skilled in the art to which the present disclosure pertains that various substitutions, modifications and changes can be made without departing from the technical idea and scope of the present disclosure. In addition, such substitutions, modifications and changes should be understood to fall within the scope of the appended claims.

Claims

1. a chamber having an inner upper end surface defining an upper end of the inner space, the inner upper end surface forming an injection flow path connecting an air-filled inner space with the outside, and an inner protruding part protruding downward from the inner upper end surface, the protruding end of the inner protruding part having a connection hole which is one end of the injection flow path; a plunger configured to form the internal space together with the chamber and to be movable vertically along the inner surface of the chamber to change the volume of the internal space, the plunger having an upper surface forming an insertion groove recessed downward so that the inner protrusion can be inserted therein; The inner top end surface and the upper side surface are spaced apart from each other.

2. 2. The air-filled liquid chemical pumping device according to claim 1, wherein an upper end of the plunger is located lower than a lower end of the inner protrusion.

3. 2. The air-filled liquid chemical pumping device according to claim 1, wherein the chamber is recessed upward along a periphery of the inner protrusion to form an air collecting groove that constitutes a part of the internal space.

4. 4. The air-filled liquid medicine pumping device according to claim 3, wherein the plunger includes an insertion portion formed to protrude upward along the periphery of the insertion groove and configured to be able to engage with the air collecting groove when the plunger moves upward.

5. 2. The air-filled liquid medicine pumping device according to claim 1, wherein the air filled in the internal space is sterilized air.

6. 2. The air-filled liquid chemical pumping device according to claim 1, which is manufactured with the internal space filled with air.

7. 2. The air-filled liquid medicine pumping device according to claim 1, further comprising a pressure operating unit configured to be able to pressurize the plunger so that the plunger moves upward.

8. The air-filled liquid chemical pumping device according to claim 1 , an injection part fixing device configured to be connected to an injection part that is inserted into the skin of a patient and configured to inject a medicinal liquid, and that forms a guide flow path configured to guide the flow of the medicinal liquid in the injection part; an air filter configured to form a filter flow path configured to be combined with the injection part fixing device and connected to an upstream end of the guide flow path to guide the flow of the medicinal liquid to the guide flow path, and to filter air in the medicinal liquid and discharge it to the outside; a connecting pipe portion that connects a downstream end of the injection flow path of the air-filled drug solution pumping device and an upstream end of the filter flow path of the air filter, forming a connecting flow path configured to guide the flow of the drug solution.

9. The chemical liquid injection device of claim 8, wherein the volume of the internal space located above a virtual horizontal line tangent to the protruding end of the inner protrusion is greater than or equal to the sum of the volume of the injection flow path and the volume of the connecting flow path.

10. 10. The chemical liquid injector according to claim 9, wherein a sum of a volume of the filter channel and a volume of the guide channel is smaller than a sum of a volume of the injection channel and a volume of the connecting channel.

11. The injection part fixing device is A fixed body that defines the guide passage; 9. The medical fluid injection device of claim 8, further comprising: a support leg configured to support the stationary body against the patient's skin.

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