Infusion port, fluid container and infusion pump

Abstract

To provide an injection port capable of injecting liquid in a liquid storage tool and discharging gas from inside the liquid storage tool, a liquid storage tool, and an infusion pump.SOLUTION: An injection port is installable in a liquid storage part, and includes a first flow channel and a second flow channel communicating with an outside and a storage space of the liquid storage part in the state that it is installed in the liquid storage part. The first flow channel allows liquid to be injected into the storage space of the liquid storage part from outside and regulates discharge of the liquid outside from the storage space of the liquid storage part. The second flow channel regulates discharge of the liquid outside from the storage space of the liquid storage part and allows discharge of the gas outside from the storage space of the liquid storage part. A flow channel terminal continuing the storage space of the first flow channel is disposed so that it enters inside the storage space with respect to a flow channel terminal continuing the storage space of the second flow channel.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to injection ports, fluid containers, and infusion pumps. [Background technology]

[0002] Injection ports for injecting liquid into liquid containers have been known for some time. Patent Document 1 discloses a medical bag as a liquid container, which is equipped with an injection inlet as an injection port. The injection inlet described in Patent Document 1 is equipped with an elastic plug. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-179242 Summary of the Invention [Problem to be solved by the invention]

[0004] The injection port described in Patent Document 1 has an elastic plug, which prevents the liquid injected into the first space of the medical bag serving as a liquid container from leaking out. However, the injection port described in Patent Document 1 cannot discharge gas from within the liquid container to the outside.

[0005] An object of the present disclosure is to provide an injection port, a liquid container, and an infusion pump that are capable of both injecting liquid into a liquid container and expelling gas from the liquid container. [Means for solving the problem]

[0006] An injection port as a first aspect of the present disclosure is an injection port that can be installed in a liquid storage section, and when installed in the liquid storage section, it has a first flow path and a second flow path that connect the outside to the storage space of the liquid storage section, the first flow path allows the injection of liquid from the outside into the storage space of the liquid storage section and has a valve body that regulates the discharge of liquid from the storage space of the liquid storage section to the outside, the second flow path has a filter that regulates the discharge of liquid from the storage space of the liquid storage section to the outside and allows the discharge of gas from the storage space of the liquid storage section to the outside, and the flow path end of the first flow path that is connected to the storage space is positioned so as to extend further inside the storage space than the flow path end of the second flow path that is connected to the storage space.

[0007] An injection port according to one embodiment of the present disclosure comprises an inner cylindrical portion and an outer cylindrical portion that covers the radial outside of the inner cylindrical portion, the first flow path being formed inside the inner cylindrical portion, and the second flow path being formed outside the inner cylindrical portion and inside the outer cylindrical portion.

[0008] In one embodiment of the present disclosure, the valve element is a check valve.

[0009] An injection port according to one embodiment of the present disclosure includes a cap that can close the second flow path.

[0010] A liquid container according to a second aspect of the present disclosure includes the injection port and the liquid container portion in which the injection port is installed.

[0011] In one embodiment of the present disclosure, the liquid storage section comprises a case section in which a recess is formed, and a membrane section that covers the recess and partitions the storage space between the case section and the recess, and the injection port is installed in the case section.

[0012] An infusion pump according to a third aspect of the present disclosure includes an infusion cartridge as the liquid container, and a pump body to which the infusion cartridge can be attached. [Effects of the Invention]

[0013] According to the present disclosure, it is possible to provide an injection port, a liquid container, and an infusion pump that are capable of both injecting liquid into a liquid container and expelling gas from the liquid container. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of an infusion pump according to an embodiment of the present disclosure, the infusion pump including an infusion cartridge according to an embodiment of the present disclosure; [Figure 2A] 2 is a diagram showing the state immediately before the infusion cartridge shown in FIG. 1 is attached to the pump body shown in FIG. 1.

[0023] FIG. [Figure 2B] 2 is a diagram showing a state in which the infusion cartridge shown in FIG. 1 is being mounted on the pump body shown in FIG. 1. FIG. [Figure 2C] 2 is a diagram showing a state in which the infusion cartridge shown in FIG. 1 has been completely attached to the pump body shown in FIG. 1. FIG. [Figure 3] 2 is a perspective view of the infusion cartridge shown in FIG. 1, showing a state in which the cover part is closed relative to the case part. FIG. [Figure 4] FIG. 2 is a cross-sectional view of the infusion cartridge shown in FIG. 1, showing a state in which no infusion agent is contained in the containing space. [Figure 5] 2 is a cross-sectional view of the infusion cartridge shown in FIG. 1, showing a state in which an infusion agent is contained in the containing space. FIG. [Figure 6] 2 is a perspective view of an injection port shown in FIG. 1 according to one embodiment of the present disclosure. [Figure 7] FIG. 7 is a cross-sectional view of the injection port shown in FIG. 6, showing the state before an injection tool is connected. [Figure 8] FIG. 7 is a cross-sectional view of the injection port shown in FIG. 6, showing the state in which an injection tool is connected. [Figure 9] FIG. 7 is a cross-sectional view of an injection port as a modification of the injection port shown in FIG. 6. [Figure 10]FIG. 7 is a cross-sectional view of an injection port as a modification of the injection port shown in FIG. 6. [Figure 11] FIG. 7 is a cross-sectional view of an injection port as a modification of the injection port shown in FIG. 6. [Figure 12] FIG. 1 is a perspective view of an injection port according to one embodiment of the present disclosure. [Figure 13] FIG. 13 is a cross-sectional view of the injection port shown in FIG. 12, showing the state in which an injection tool is not connected. [Figure 14] FIG. 13 is a cross-sectional view of the injection port shown in FIG. 12, showing the state in which an injection tool is connected. [Figure 15] 1 is a cross-sectional view illustrating a liquid container according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of an injection port, a liquid container, and an infusion pump according to the present disclosure will be illustrated and described with reference to the drawings. In each drawing, the same components are designated by the same reference numerals.

[0016] FIG. 1 is a front view showing an infusion pump 100 as one embodiment of the infusion pump according to the present disclosure. As shown in FIG. 1, the infusion pump 100 includes a pump body 1 and an infusion cartridge 2 as one embodiment of the liquid container according to the present disclosure. The infusion pump 100 shown in FIG. 1 can be used, for example, as a PCA (Patient Controlled Analgesia) pump, but its use is not particularly limited. In the infusion pump 100 of this embodiment, the pump body 1 can be reused by replacing the disposable infusion cartridge 2.

[0017] <Pump body 1> As shown in FIG. 1, the front of the pump body 1 is provided with a display unit 120 that displays various information and an operation unit 130 with an array of operation switches. The display unit 120 displays, for example, the infusion rate and cumulative dose. The display unit 120 may also be a liquid crystal display (LCD) screen with a touch panel for setting the infusion rate. The operation switches of the operation unit 130 shown in FIG. 1 are a fast-forward switch 131, a start switch 132, a stop switch 133, and a power switch 134. While the fast-forward switch 131 is pressed, infusion can be delivered at a rate faster than the set infusion rate (mL / h). Pressing the start switch 132 starts infusion delivery. Pressing the stop switch 133 stops infusion delivery. Pressing the power switch 134 turns the pump body 1 on and off. However, the operation unit 130 may also include other operation switches. The display unit 120 and the operation unit 130 make it possible to deliver an infusion agent such as a medicinal liquid into the living body of a patient or the like while controlling the amount of fluid delivered.

[0018] The pump body 1 also includes a fluid delivery unit 140 that sandwiches the tube 14 of the infusion cartridge 2 between itself and a tube receiving surface 24 (see FIG. 3) of the infusion cartridge 2, which will be described later, and delivers the infusion agent in the tube 14 from the upstream side of the flow path to the downstream side of the flow path. The fluid delivery unit 140 of this embodiment includes multiple fingers and a drive unit that drives these fingers. The multiple fingers are arranged on a surface of the pump body 1 that faces a tube receiving surface 24 (see FIG. 3) of the infusion cartridge 2, which will be described later. The multiple fingers are arranged along the extension direction of the tube 14. Each finger is driven by the drive unit to reciprocate in a direction facing the tube receiving surface 24 (see FIG. 3) of the infusion cartridge 2, which will be described later. As each finger moves closer to the infusion cartridge 2, the tube 14 is sandwiched between the finger and the tube receiving surface 24. This causes the tube 14 to be compressed and closed. The drive unit sequentially drives the fingers in the extension direction of the tube portion 14 from the upstream side of the flow path to the downstream side of the flow path. The drive unit may include, for example, an electric motor driven by a power source such as a battery, a drive mechanism for operating the fingers, etc. As a result, the tube portion 14 is sequentially compressed and closed from the upstream side of the flow path to the downstream side of the flow path, causing peristaltic movement. Therefore, the infusion agent in the tube portion 14 can be delivered from the upstream side of the flow path to the downstream side of the flow path.

[0019] Furthermore, pump body 1 of this embodiment includes exterior member 160. That is, the outer surface of pump body 1 of this embodiment is covered by exterior member 160. Display unit 120 and operation unit 130 described above are exposed to the outside through openings formed in exterior member 160. Exterior member 160 may be formed from, for example, various resin materials. Exterior member 160 may be formed integrally from a single member, or may be composed of two or more members, for example.

[0020] The pump body 1 is not limited to the configuration of this embodiment. The pump body 1 may include other components, such as an air bubble detection sensor, an occlusion sensor, or other notification components, in addition to the components described above. As described above, the fluid delivery section 140 of the pump body 1 of this embodiment is configured to press the tube section 14 with multiple fingers, but may include a pressing section other than the fingers as long as the configuration allows the infusion agent in the tube section 14 to be delivered.

[0021] <Infusion Cartridge 2> The infusion cartridge 2 can be attached to the pump body 1. First, the operation of attaching the infusion cartridge 2 to the pump body 1 will be described with reference to FIGS. 2A to 2C. FIG. 2A shows the state immediately before the infusion cartridge 2 is attached to the pump body 1. FIG. 2B shows the state during the process of attaching the infusion cartridge 2 to the pump body 1. FIG. 2C shows the attached state after the infusion cartridge 2 has been attached to the pump body 1. As shown in FIGS. 2A to 2C, the pump body 1 of this embodiment includes a receiving portion 151 having a through-hole 151a formed therein, and a locking claw portion 152. The infusion cartridge 2 of this embodiment also includes a swing shaft portion 51 and a claw receiving portion 52 having a through-hole 52a formed therein.

[0022] As shown in FIG. 2A, when attaching the infusion cartridge 2 to the pump body 1, the pivot shaft 51 of the infusion cartridge 2 is fitted into the through-hole 151a of the receiving portion 151 of the pump body 1. Next, as shown in FIG. 2B, the infusion cartridge 2 is swung around the pivot shaft 51 with the pivot shaft 51 fitted into the through-hole 151a. As a result, as shown in FIG. 2C, the locking claws 152 of the pump body 1 enter the through-holes 52a of the claw receiving portion 52 of the infusion cartridge 2, locking the claw receiving portion 52. This completes the attachment of the infusion cartridge 2 to the pump body 1. More specifically, in this embodiment, the attachment of the infusion cartridge 2 to the pump body 1 is completed when the oscillating shaft portion 51 of the infusion cartridge 2 engages with the through hole 151a of the receiving portion 151 of the pump body 1 and the locking claw portion 152 of the pump body 1 enters the through hole 52a of the claw receiving portion 52 of the infusion cartridge 2.

[0023] To remove the infusion cartridge 2 from the pump body 1, the above-described steps are reversed. First, the locking claws 152 of the pump body 1 are disengaged from the through-holes 52a of the claw receivers 52 of the infusion cartridge 2. Next, the infusion cartridge 2 is swung in the direction opposite to the arrow in FIG. 2B. Next, the swing shaft 51 of the infusion cartridge 2 is removed from the through-hole 151a of the receiver 151 of the pump body 1. This completes the removal of the infusion cartridge 2 from the pump body 1.

[0024] In this embodiment, the pump body 1 and the infusion cartridge 2 are attached and detached by the receiving portion 151 and the locking claw portion 152 of the pump body 1 and the swing shaft portion 51 and the claw receiving portion 52 of the infusion cartridge 2, but the configuration for attaching and detaching the pump body 1 and the infusion cartridge 2 is not particularly limited. Therefore, the pump body 1 and the infusion cartridge 2 may be attached and detached using a mechanism different from that of this embodiment.

[0025] Next, an overview of the infusion cartridge 2 of this embodiment will be described with reference to Figures 1 to 5. Figure 3 is a perspective view of the infusion cartridge 2, showing a state in which the cover part 13 is closed relative to the case part 11. Figure 4 is a cross-sectional view of the infusion cartridge 2, showing a state in which the infusion agent X is not contained in the containing space 2a. Figure 5 is a cross-sectional view of the infusion cartridge 2, showing a state in which the infusion agent X is contained in the containing space 2a.

[0026] 4 and 5, the infusion cartridge 2 includes a liquid storage section 2b that defines a storage space 2a capable of storing an infusion agent X, and an injection port 2d provided in the liquid storage section 2b. The infusion agent X can be injected from the outside into the storage space 2a of the liquid storage section 2b through the injection port 2d. Furthermore, gas in the storage space 2a of the liquid storage section 2b can be discharged to the outside through the injection port 2d.

[0027] As shown in FIGS. 3 to 5, the liquid storage portion 2b includes a case portion 11, a membrane portion 12, a cover portion 13, and a tube portion .

[0028] As shown in FIGS. 4 and 5, a recess 21 is formed in the case 11. The recess 21 of this embodiment has a planar bottom surface 21a and side surfaces 21b that rise continuously from the outer edge of the bottom surface 21a. The open end of the recess 21 is formed by the end of the side surface 21b opposite the bottom surface 21a, i.e., the edge of the recess 21. The recess 21 of this embodiment has the shape described above, but the shape of the recess 21 is not particularly limited. Therefore, the bottom surface 21a of the recess 21 may be, for example, a concavely curved surface. Furthermore, the side surfaces 21b of the recess 21 may be planar or curved.

[0029] The membrane part 12 is flexible. As shown in Figs. 4 and 5, the membrane part 12 covers the open end of the recess 21 of the case part 11 and defines the storage space 2a between the membrane part 12 and the recess 21. The membrane part 12 of this embodiment is joined to the edge of the recess 21. The case part 11 and the membrane part 12 can be joined by, for example, welding, but the joining method is not particularly limited.

[0030] The case 11 has a fixed shape that does not deform even when subjected to the internal pressure of the infusion agent X contained in the containing space 2a. The case 11 may be formed of a single member, or may be formed by assembling two or more members together.

[0031] As shown in FIGS. 4 and 5, the case 11 of this embodiment includes a bottom wall 11a and an annular side wall 11b rising from the outer edge of the bottom wall 11a. The recess 21 of the case 11 is defined by the inner surfaces of the bottom wall 11a and the side wall 11b. As shown in FIG. 3, a tube receiving surface 24 is formed on the outer surface of the side wall 11b of the case 11, on the surface that faces the pump body 1 when the infusion cartridge 2 is attached to the pump body 1 (see FIG. 2C). The tube 14 is disposed along the tube receiving surface 24. The case 11 of this embodiment includes an opening tubular portion 11b1. The opening tubular portion 11b1 is formed on the side wall 11b of the case 11. The opening tubular portion 11b1 connects the outside of the liquid storage portion 2b with the storage space 2a of the liquid storage portion 2b. An injection port 2d is provided in the opening tubular portion 11b1. More specifically, the injection port 2d is fitted into the opening cylindrical portion 11b1 of this embodiment.

[0032] The membrane part 12 is deformed by the internal pressure of the infusion agent X contained in the containing space 2a. The thickness of the membrane part 12 is smaller than the thickness of the above-mentioned case part 11. The volume of the containing space 2a varies as the membrane part 12 is deformed.

[0033] In this manner, the storage space 2a of the liquid storage portion 2b in this embodiment is defined by the recess 21 of the case portion 11 and the membrane portion 12 that covers this recess 21.

[0034] The cover part 13 is configured to be openable and closable relative to the case part 11. The cover part 13 includes a cover main body part 13a and a hinge part 13b (see FIGS. 1 to 2C).

[0035] The hinge portion 13b is connected to the case portion 11. The cover main body portion 13a is rotatable around the hinge portion 13b between a closed state (see FIGS. 3 to 5) in which it covers the membrane portion 12 and an open state in which it does not cover the membrane portion 12.

[0036] In this embodiment, the cover main body 13a and the hinge 13b are formed integrally with the case 11, but this is not limiting. In other words, the cover 13 may be formed separately from the case 11 and attached to the case 11 so as to be rotatable relative to the case 11.

[0037] When the infusion agent X is injected into the storage space 2a through the injection port 2d, the cover main body 13a is in an open state where it does not cover the membrane 12. Therefore, even if air bubbles enter the storage space 2a when the infusion agent X is injected into the storage space 2a, the membrane 12 can be easily deformed by being pressed from the outside. Therefore, when the infusion agent X is injected into the storage space 2a, the air bubbles in the storage space 2a can be easily moved.

[0038] After the infusion agent X is injected into the containing space 2a through the injection port 2d, the cover body 13a is brought into a closed state to cover the membrane 12. The infusion cartridge 2 is attached to the pump body 1 with the cover body 13a in the closed state (see FIGS. 2A to 2C).

[0039] As shown in Fig. 3, the base end of the tube portion 14 communicates with the storage space 2a via an L-shaped connecting tube portion 25. When the infusion pump 100 is in use, the tube portion 14 is used as an infusion tube for administering the infusion agent X filled in the storage space 2a into a living body. That is, in the infusion pump 100 shown in Fig. 1, the infusion agent X discharged from the storage space 2a into the tube portion 14 can be sent downstream of the flow path by causing peristaltic movement in the tube portion 14. For example, an indwelling needle placed in the living body is located downstream of the tube portion 14 in the flow path, and the infusion agent X can be administered into the living body through this indwelling needle.

[0040] As shown in Figures 4, 5, etc., the injection port 2d is installed in the liquid storage portion 2b. More specifically, the injection port 2d in this embodiment is installed in an opening tubular portion 11b1 formed in the case portion 11 of the liquid storage portion 2b. However, part or all of the injection port 2d may be formed integrally with the liquid storage portion 2b. As an example, an outer tubular portion 35 (described later) of the injection port 2d in this embodiment may be formed integrally with the opening tubular portion 11b1 of the liquid storage portion 2b.

[0041] As described above, in the infusion cartridge 2, the infusion agent X is injected into the containing space 2a through the injection port 2d. In addition, in the infusion cartridge 2, gas is discharged from the containing space 2a to the outside of the liquid containing portion 2b through the injection port 2d.

[0042] Next, the injection port 2d will be described in detail with reference to Figures 4 to 8. Figure 6 is a perspective view of the injection port 2d. Figures 7 and 8 are cross-sectional views of the injection port 2d. Figure 7 shows the injection port 2d in a state before a syringe 200 serving as an injection tool is connected. Figure 8 shows the injection port 2d in a state in which a syringe 200 serving as an injection tool is connected.

[0043] As shown in Figures 4 and 5, when the injection port 2d is installed in the liquid storage portion 2b, it has a first flow path 34a and a second flow path 35a that connect the outside with the storage space 2a of the liquid storage portion 2b.

[0044] The first flow path 34a is provided with a check valve 37 as a valve body. The check valve 37 allows the injection of liquid (infusion agent X in this embodiment) from the outside into the storage space 2a of the liquid storage portion 2b. The check valve 37 also restricts the discharge of liquid from the storage space 2a of the liquid storage portion 2b to the outside.

[0045] More specifically, the check valve 37 of this embodiment is a duckbill valve. Details of the duckbill valve used as the check valve 37 of this embodiment will be described later.

[0046] The second flow path 35a includes a filter 38. The filter 38 regulates the discharge of liquid (in this embodiment, the infusion agent X) from the storage space 2a of the liquid storage unit 2b to the outside. The filter 38 also allows the discharge of gas (in this embodiment, the air in the storage space 2a) from the storage space 2a of the liquid storage unit 2b to the outside.

[0047] The material of the filter 38 is not particularly limited. However, it is preferable that the filter 38 has a hydrophobic surface or is made of a hydrophobic membrane. Examples of materials that can be used for the hydrophobic membrane include polytetrafluoroethylene (PTFE), a copolymer of tetrafluoroethylene and hexafluoropropylene (FEP), a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether (PFA), and polyvinylidene fluoride (PVDF). The filter 38 preferably has a porous structure. A porous filter 38 can be obtained by, for example, making the above-mentioned material for the hydrophobic membrane porous using a stretching method, a microphase separation method, an electron beam etching method, a sintering method, an argon plasma particle method, or the like. The method for the hydrophobic treatment is not particularly limited. For example, a method of coating the surface of a filter material with a hydrophobic material may be used. Furthermore, the filter 38 is not limited to the above-mentioned structure as long as it has a hydrophobic structure that allows gas to pass through but blocks liquids, and may also include other materials, such as a hydrophilic material. Such a hydrophobic filter 38 can discharge the gas in the containing space 2a to the outside and can also prevent the infusion agent X in the containing space 2a from being discharged to the outside.

[0048] The injection port 2d of this embodiment will be described in further detail below with reference to FIGS.

[0049] The injection port 2 d of this embodiment includes a port body 31 , a cap 32 , and a hinge 33 .

[0050] The port main body 31 includes an inner cylindrical portion 34, an outer cylindrical portion 35 that covers the outside of the inner cylindrical portion 34 in the radial direction B, and a connecting portion 36. The first flow path 34a of this embodiment is formed inside the inner cylindrical portion 34. The second flow path 35a of this embodiment is formed outside the inner cylindrical portion 34 and inside the outer cylindrical portion 35. The connecting portion 36 connects the inner cylindrical portion 34 and the outer cylindrical portion 35. The connecting portion 36 of this embodiment extends from the outer surface of the inner cylindrical portion 34 outward in the radial direction B and is continuous with the inner surface of the outer cylindrical portion 35. A plurality of connecting portions 36 of this embodiment are arranged at intervals in the circumferential direction C of the inner cylindrical portion 34 and the outer cylindrical portion 35. A gap between two connecting portions 36 adjacent to each other in the circumferential direction C constitutes part of the second flow path 35a.

[0051] As shown in FIGS. 7 and 8, a male thread portion 34b is formed on the outer surface of the inner cylindrical portion 34 of this embodiment. As shown in FIGS. 7 and 8, a syringe 200 serving as an injection tool includes a syringe main body 201 that defines a storage space 201a. The syringe 200 also includes a male luer portion 202 that defines a flow path 202a that communicates with the storage space 201a. The syringe 200 also includes a cylindrical portion 203 that covers the radially outer periphery of the male luer portion 202. A female thread portion 203a is formed on the inner surface of the cylindrical portion 203. The syringe 200 is connected to the port main body 31 by fitting the male luer portion 202 into the inner cylindrical portion 34 and threading the female thread portion 203a of the cylindrical portion 203 into the male thread portion 34b. In this manner, the syringe 200 serving as an injection tool is connected to the injection port 2d of this embodiment.

[0052] Hereinafter, for ease of explanation, when the injection port 2d is installed in the liquid storage section 2b, one side of the inner tube section 34 and the outer tube section 35 in the central axis direction A that is on the storage space 2a side will be referred to as the "tip side," and the other side will be referred to as the "base side."

[0053] 7 and 8, the inner cylindrical portion 34 of this embodiment has an annular flange portion 34c at its tip portion, which is the end portion on the tip side, that protrudes inward in the radial direction B. The check valve 37 of this embodiment is fixed to the inner cylindrical portion 34 by sandwiching a fixing portion 37c between the annular flange portion 34c and a pressing cylindrical body 39 that is fitted into the inner cylindrical portion 34 by press-fitting or the like.

[0054] 7 and 8, the base end portion, which is the end portion on the base end side of the outer tube portion 35 of this embodiment, is provided with an annular flange portion 35b that protrudes outward in the radial direction B. The cap 32 is connected via a hinge 33 to a part of the outer edge of the annular flange portion 35b.

[0055] 7 and 8, the duckbill valve serving as the check valve 37 of this embodiment includes a cylindrical portion 37a, a valve portion 37b, and a fixed portion 37c. The valve portion 37b is connected to the tip end, which is one axial end of the cylindrical portion 37a. The fixed portion 37c is connected to the base end, which is the other axial end of the cylindrical portion 37a.

[0056] The valve portion 37b includes two deformable plate portions 37b1 that are inclined toward each other from a base end connected to the tip side of the cylindrical portion 37a to the tip end on the opposite side. The deformable plate portions 37b1 are inclined plate portions that extend at an angle relative to the axial direction of the cylindrical portion 37a. The tip ends of the two deformable plate portions 37b1 contact each other, forming a slit 37b2 between them.

[0057] The slit 37b2 formed by the tip ends of the two deforming plate portions 37b1 is closed in its natural state (when no external force is applied.) This slit 37b2 opens when the tip ends of the two deforming plate portions 37b1 deform so as to move away from each other.

[0058] As shown in FIGS. 4 and 5 , the two deformable plate portions 37b1 of the duckbill valve serving as the check valve 37 of this embodiment are inclined so that they approach each other toward the accommodation space 2a. Therefore, when liquid is injected into the accommodation space 2a through the injection port 2d, the liquid presses the inner surfaces of the two deformable plate portions 37b1 in a direction separating the two deformable plate portions 37b1 from each other. This opens the slit 37b2, and the check valve 37 allows the liquid to be injected from the outside into the accommodation space 2a through the first flow path 34a. On the other hand, when liquid attempts to flow out from the accommodation space 2a toward the first flow path 34a, the outflowing liquid presses the outer surfaces of the two deformable plate portions 37b1 in a direction moving the two deformable plate portions 37b1 toward each other. This keeps the slit 37b2 closed, and the check valve 37 restricts the discharge of liquid from the accommodation space 2a to the outside through the first flow path 34a.

[0059] Although the valve portion 37b of the duckbill valve serving as the check valve 37 of this embodiment includes two deformed plate portions 37b1, the present invention is not limited to this configuration. The valve portion 37b may include three or more deformed plate portions.

[0060] The fixing portion 37c protrudes outward from the base end of the cylindrical portion 37a in the radial direction B. That is, the fixing portion 37c in this embodiment is an annular flange protruding from the base end of the cylindrical portion 37a. As described above, the check valve 37 in this embodiment is fixed to the inner cylindrical portion 34 by sandwiching the fixing portion 37c between the annular flange portion 34c of the inner cylindrical portion 34 and the holding cylindrical body 39 that is fitted into the inner cylindrical portion 34 by press-fitting or the like.

[0061] 4 and 5, the check valve 37 in this embodiment forms the tip of the first flow path 34a, but this configuration is not limited to this. That is, the check valve 37 may be disposed at any position in the first flow path 34a. Therefore, the entire check valve 37 may be disposed within the inner cylindrical portion 34, for example.

[0062] Examples of materials constituting the check valve 37 of this embodiment include synthetic rubbers such as polybutadiene, nitrile, and chloroprene, natural rubbers such as polyisoprene, thermosetting elastomers such as urethane rubber, silicone rubber, and fluororubber, thermoplastic elastomers, and other elastomers.

[0063] Furthermore, the shape of the check valve 37 of the first flow path 34a is not limited to that of this embodiment. FIGS. 9 to 11 are cross-sectional views showing modifications of the injection port 2d of this embodiment. The injection port 302d shown in FIG. 9 includes a duckbill valve as the check valve 37, but its shape differs from that shown in FIGS. 7 and 8. The check valve 37 shown in FIG. 9 includes the same tubular portion 37a and valve portion 37b as those shown in FIGS. 7 and 8, but does not include the fixed portion 37c shown in FIGS. 7 and 8. In the port main body 331 of the injection port 302d shown in FIG. 9, the check valve 37 is sandwiched and held between the inner tubular portion 34 and a cover member 40 fixed to the inner tubular portion 34. Specifically, the cover member 40 includes a tubular side wall portion 40a and an annular flange portion 40b protruding inward in the radial direction B from the tip of the side wall portion 40a. The side wall portion 40a is fixed to the tip surface of the inner cylindrical portion 34 by ultrasonic welding or the like, in a state where it covers the outer periphery in the radial direction B of the cylindrical portion 37a of the check valve 37. However, the side wall portion 40a may, for example, be fitted onto the outside of the inner cylindrical portion 34. The annular flange portion 40b covers the tip surface of the cylindrical portion 37a of the check valve 37. The valve portion 37b of the check valve 37 protrudes outward through an opening on the inside of the annular flange portion 40b of the cover member 40.

[0064] An injection port 402d shown in FIG. 10 includes an annular elastic cover valve 41 serving as a check valve 37. The inner cylindrical portion 34 shown in FIG. 10 includes a protruding portion 34d that protrudes distally beyond the outer cylindrical portion 35. A closing wall portion 34d1 is provided at the distal end of the protruding portion 34d. A through-hole 34d2 is formed in the side wall of the protruding portion 34d. The annular elastic cover valve 41 serving as a check valve 37 is located radially outward of the protruding portion 34d of the inner cylindrical portion 34 in the B direction and is in close contact with the outer surface of the protruding portion 34d. Therefore, the through-hole 34d2 formed in the protruding portion 34d is covered by the annular elastic cover valve 41. In the port main body 431 of the injection port 402d shown in FIG. 10, the annular elastic cover valve 41 is pressed outward in the radial direction B by the pressure of the liquid discharged from the inner cylindrical portion 34 through the through-hole 34d2. This causes the annular elastic cover valve 41 to elastically deform so as to expand outward in the radial direction B. Therefore, a gap is formed between the inner surface of the annular elastic cover valve 41 and the outer surface of the protrusion 34d, and liquid is allowed to be poured through this gap toward the accommodation space 2a (in the direction of the arrow in FIG. 10). Meanwhile, the annular elastic cover valve 41 prevents the liquid in the accommodation space 2a from flowing back into the through-hole 34d2. In other words, the annular elastic cover valve 41 restricts the discharge of liquid from the accommodation space 2a to the outside through the first flow path 34a.

[0065] The injection port 502d shown in FIG. 11 includes an umbrella valve 42 serving as a check valve 37. The umbrella valve 42 includes a rod-shaped portion 42a and a circular, flattened valve membrane portion 42b that protrudes in the radial direction B from the tip of the rod-shaped portion 42a. The rod-shaped portion 42a is supported by a support portion 34e formed on the inner surface of the inner cylindrical portion 34. Specifically, the rod-shaped portion 42a is inserted into a through-hole formed in the support portion 34e. The rod-shaped portion 42a is provided with an expanded diameter portion 42a1. The rod-shaped portion 42a is supported by the support portion 34e by the expanded diameter portion 42a1 being caught on the edge of the through-hole. In addition to the through-hole through which the rod-shaped portion 42a is inserted, the support portion 34e also includes another through-hole that constitutes a part of the first flow path 34a. The valve membrane portion 42b is arranged to cover the tip surface of the inner cylindrical portion 34. In the port main body 531 of the injection port 502d shown in FIG. 11, the pressure of the liquid discharged through the tip of the inner cylindrical portion 34 presses the valve membrane portion 42b so as to move away from the tip surface of the inner cylindrical portion 34. As a result, the valve membrane portion 42b elastically deforms in a direction moving away from the tip surface of the inner cylindrical portion 34 (downward in FIG. 11). This creates a gap between the valve membrane portion 42b and the tip surface of the inner cylindrical portion 34, allowing the liquid to be injected through this gap toward the accommodation space 2a (in the direction of the arrow in FIG. 11). Meanwhile, the valve membrane portion 42b of the umbrella valve 42 prevents the liquid in the accommodation space 2a from flowing back into the inner cylindrical portion 34. In other words, the umbrella valve 42 restricts the discharge of the liquid from the accommodation space 2a to the outside through the first flow path 34a.

[0066] In this way, the shape of the check valve 37 is not particularly limited as long as it is configured to allow the injection of liquid from the outside into the storage space 2a of the liquid storage section 2b (see Figures 4, 5, etc.) and to regulate the discharge of liquid from the storage space 2a of the liquid storage section 2b to the outside.

[0067] Referring again to FIGS. 4 to 8, the filter 38 of this embodiment will be described. As shown in FIGS. 4 and 5, the filter 38 constitutes the tip of the second flow path 35a. Specifically, the filter 38 of this embodiment is disposed between the tip of the inner tube 34 and the tip of the outer tube 35, and is fixed to the tip of the inner tube 34 and the tip of the outer tube 35 by ultrasonic welding or the like. That is, the filter 38 of this embodiment covers the tip side (the lower side in FIGS. 7 and 8) of the annular space between the inner tube 34 and the outer tube 35. The filter 38 of this embodiment may be a hydrophobic filter. Therefore, the filter 38 restricts the discharge of liquid from the storage space 2a of the liquid storage portion 2b to the outside through the second flow path 35a. Furthermore, the filter 38 allows the discharge of gas from the storage space 2a of the liquid storage portion 2b to the outside through the second flow path 35a.

[0068] As shown in FIGS. 4 and 5 , the flow path end E1 of the first flow path 34a, which is connected to the storage space 2a, is positioned closer to the storage space 2a than the flow path end E2 of the second flow path 35a, which is connected to the storage space 2a. This allows gas, such as bubbles, in the storage space 2a to be expelled to the outside of the liquid storage section 2b through the second flow path 35a, compared to a configuration without such an arrangement. This means that gas can be prevented from accumulating in the storage space 2a after the liquid is injected into the storage space 2a through the injection port 2d. More specifically, in the infusion cartridge 2, the injection port 2d is positioned vertically upward, and the infusion agent X is injected into the storage space 2a through the first flow path 34a of the injection port 2d. As the infusion agent X is injected into the storage space 2a, the air remaining in the storage space 2a is pushed out through the second flow path 35a. The air can be discharged through the second flow path 35a until the infusion agent X exceeds the height of the flow path end E1 of the first flow path 34a and reaches the height of the flow path end E2 of the second flow path 35a. In other words, more gas, such as bubbles, in the storage space 2a can be discharged to the outside than when the positional relationship between the flow path end E1 of the first flow path 34a and the flow path end E2 of the second flow path 35a is reversed. Therefore, the amount of infusion agent X filled in the storage space 2a can be increased.

[0069] In this embodiment, the flow path end E1 of the first flow path 34a is formed by the tip of the check valve 37, but this is not limited to this configuration. In other words, the flow path end E1 of the first flow path 34a is not limited to the check valve 37, but may be formed by another portion of the first flow path 34a. Furthermore, in this embodiment, the flow path end E2 of the second flow path 35a is formed by the filter 38, but this is not limited to this configuration. In other words, the flow path end E2 of the second flow path 35a is not limited to the filter 38, but may be formed by another portion of the second flow path 35a.

[0070] The cap 32 can be attached to the port body 31. When attached to the port body 31, the cap 32 of this embodiment can close the first flow path 34a and the second flow path 35a of the port body 31. Specifically, as shown in FIGS. 4 to 8 , the cap 32 of this embodiment includes a first cylindrical portion 32a fitted into the inner cylindrical portion 34, a second cylindrical portion 32b fitted between the inner cylindrical portion 34 and the outer cylindrical portion 35, and a top wall portion 32c that closes one end of the first cylindrical portion 32a and the second cylindrical portion 32b. In other words, the first flow path 34a can be closed by the first cylindrical portion 32a and the top wall portion 32c, and the second flow path 35a can be closed by the second cylindrical portion 32b and the top wall portion 32c. This makes it possible to prevent unintended fluid flow through the first flow path 34a and the second flow path 35a. In particular, as described above, the filter 38 of this embodiment is a hydrophobic filter, and the second flow path 35a allows gas to flow from the outside into the storage space 2a. Therefore, it is preferable to attach the cap 32 to the port body 31 and close the second flow path 35a after the injection of the infusion agent X into the storage space 2a is completed. In this way, gas can be prevented from flowing from the outside into the storage space 2a after the injection of the infusion agent X is completed.

[0071] As described above, the cap 32 of this embodiment is configured to be able to close the first flow path 34a and the second flow path 35a, but is not limited to this configuration. The cap 32 of this embodiment may be configured to be able to close only the second flow path 35a.

[0072] Next, injection port 602d as another embodiment of the injection port according to the present disclosure will be described with reference to Figures 12 to 14. Figure 12 is a perspective view of injection port 602d. Figures 13 and 14 are cross-sectional views of injection port 602d. Figure 13 shows a state in which syringe 200 as an injection tool is not attached, and Figure 14 shows a state in which syringe 200 as an injection tool is attached.

[0073] 12 to 14, injection port 602d includes a housing 612 having a first flow path 612a and a second flow path 612b. First flow path 612a includes a valve body 613. Second flow path 612b includes a filter .

[0074] Valve element 613 is formed with a slit 613a through which male luer part 202 can be inserted from the outside. In other words, valve element 613 allows liquid to be injected from the outside into housing space 2a of liquid storage unit 2b. Furthermore, slit 613a of valve element 613 closes when male luer part 202 is removed. In other words, valve element 613 restricts discharge of liquid from housing space 2a of liquid storage unit 2b to the outside.

[0075] The filter 38 has the same configuration as that shown in FIGS. 4 to 8, and therefore a description thereof will be omitted here.

[0076] The housing 612 of this embodiment includes a top cap 614, a bottom cap 615, and a holder portion 616. The top cap 614 covers the outer edge of the top surface of the valve body 613. The bottom cap 615 abuts against the outer edge of the bottom surface of the valve body 613, sandwiching the valve body 613 between the top cap 614 and the bottom cap 615. A male thread portion 614a is formed on the side of the top cap 614, and can be threaded with a female thread portion 203a formed on the inner surface of a cylindrical portion 203 of a syringe 200 serving as an injection tool. The holder portion 616 supports the top cap 614 and the bottom cap 615. The first flow path 612a of this embodiment is formed across the top cap 614, the bottom cap 615, and the holder portion 616. The second flow path 612b of this embodiment is formed in the holder portion 616.

[0077] In addition, the external communication port 612b1 of the second flow path 612b in this embodiment, which is connected to the outside, is covered by the annular elastic cover valve 43. Therefore, at the injection port 602d, when the internal pressure of the accommodation space 2a increases, the annular elastic cover valve 43 is pressed radially outward. This causes the annular elastic cover valve 43 to elastically deform so as to expand radially outward. This creates a gap between the inner surface of the annular elastic cover valve 43 and the outer surface of the holder part 616, on which the external communication port 612b1 is formed. Gas in the accommodation space 2a can be discharged to the outside through this gap. Meanwhile, the annular elastic cover valve 43 does not allow gas to flow into the second flow path 612b from the outside. In other words, the annular elastic cover valve 43 in this embodiment is a cap that closes the second flow path 612b and restricts the flow of gas from the outside into the second flow path 612b. Furthermore, the annular elastic cover valve 43 of this embodiment also functions as a check valve that allows gas to be discharged from the accommodation space 2a to the outside and restricts gas from flowing into the accommodation space 2a from the outside.

[0078] As described above, the injection port 602d of this embodiment also includes a first flow path 612a and a second flow path 612b. The first flow path 612a allows the injection of liquid from the outside into the housing space 2a of the liquid storage unit 2b and includes a valve element 613 that regulates the discharge of liquid from the housing space 2a of the liquid storage unit 2b to the outside. Furthermore, the second flow path 612b includes a filter 38 that regulates the discharge of liquid from the housing space 2a of the liquid storage unit 2b to the outside and allows the discharge of gas from the housing space 2a of the liquid storage unit 2b to the outside.

[0079] As shown in FIGS. 13 and 14, in the injection port 602d of this embodiment, the flow path end E1 of the first flow path 612a, which is connected to the storage space 2a, is positioned closer to the interior of the storage space 2a (lower in FIGS. 13 and 14) than the flow path end E2 of the second flow path 612b, which is connected to the storage space 2a. This configuration allows gas, such as bubbles, in the storage space 2a to be expelled to the outside of the liquid storage section 2b through the second flow path 612b, compared to a configuration without such an arrangement. This means that gas can be prevented from accumulating in the storage space 2a after the liquid is injected into the storage space 2a through the injection port 602d. More specifically, with the injection port 602d facing vertically upward, the infusion agent is injected into the storage space 2a through the first flow path 612a of the injection port 602d. As the infusion agent is injected into the storage space 2a, the air remaining in the storage space 2a is expelled to the outside through the second flow path 612b. Air can be discharged through the second flow path 612b until the infusion agent exceeds the height of the flow path end E1 of the first flow path 612a and reaches the height of the flow path end E2 of the second flow path 612b. In other words, more gas, such as bubbles, in the containing space 2a can be discharged to the outside than when the positional relationship between the flow path end E1 of the first flow path 612a and the flow path end E2 of the second flow path 612b is reversed. Therefore, the amount of infusion agent X filled in the containing space 2a can be increased.

[0080] As described above, the injection port 602d of this embodiment includes the annular elastic cover valve 43 as a cap that can close the second flow path 612b. By configuring the cap as the annular elastic cover valve 43, which is a check valve, the user does not need to operate the cap. Furthermore, it is possible to constantly prevent gas from flowing into the accommodation space 2a from the outside through the second flow path 612b.

[0081] Fig. 15 is a diagram showing an infusion cartridge 702 as one embodiment of a liquid container according to the present disclosure. As shown in Fig. 15, the infusion cartridge 702 includes a liquid container portion 702b that defines the container space 2a, and an injection port 702d.

[0082] The injection port 602d of this embodiment differs from the injection port 602d shown in FIGS. 12 to 14 only in that it has an annular elastic cover valve 43, and the other configurations are the same, so a description thereof will be omitted here.

[0083] The liquid storage section 702b of this embodiment includes a balloon body 620 that defines a storage space 2a. The storage space 2a of the liquid storage section 702b of this embodiment is configured to have an internal pressure that is always higher than atmospheric pressure. That is, the storage space 2a of this embodiment is configured to maintain a pressure (positive pressure) higher than the external atmospheric pressure to which it is connected via the second flow path 612b. Therefore, in the infusion cartridge 702 of this embodiment, gas does not flow into the storage space 2a from the outside through the second flow path 612b of the injection port 702d. Therefore, as shown in FIG. 15, the injection port 702d of this embodiment does not need to include the annular elastic cover valve 43 shown in FIGS. 12 to 14.

[0084] The injection port, liquid container, and infusion pump according to the present disclosure are not limited to the specific configurations shown in the above-described embodiments and modifications, and various modifications, alterations, and combinations are possible without departing from the scope of the claims. While the above-described embodiments and modifications illustrate an infusion cartridge for an infusion pump as an example of a liquid container, the liquid container according to the present disclosure is not limited to an infusion cartridge. The liquid container may be configured to define a storage space into which liquid is injected using an injection port, and may be configured in a manner other than an infusion cartridge, such as a drug solution bag. [Industrial Applicability]

[0085] The present disclosure relates to injection ports, fluid containers, and infusion pumps. [Explanation of symbols]

[0086] 1: Pump body 2, 702: Infusion cartridge (an example of a liquid container) 2a: Containment space 2b, 702b: liquid storage section 2d, 302d, 402d, 502d, 602d, 702d: Injection ports 11: Case part 11a: Bottom wall part 11b: Side wall part 11b1:Opening cylinder part 12: Membrane part 13: Cover part 13a: Cover body 13b: Hinge part 14: Pipe part 21: Recess 21a: Bottom 21b: Side 24: Pipe receiving surface 25: Connection pipe section 31, 331, 431, 531: Port body 32: Cap 32a: First cylinder part 32b: Second cylinder part 32c: Ceiling wall part 33: Hinge 34: Inner cylinder 34a: First flow path 34b: Male thread 34c: Annular flange 34d:Protrusion 34d1: Closed wall part 34d2:Through hole 34e: Support part 35: Outer cylinder 35a: Second flow path 35b: Annular flange portion 36:Connection part 37: Check valve (an example of a valve body) 37a: Cylinder part 37b: Valve part 37b1: Deformed plate section 37b2:Slit 37c: Fixed part 38: Filter 39: Presser tube 40: Cover member 40a: Side wall 40b: Annular flange portion 41: Annular elastic cover valve (an example of a valve body and check valve) 42: Umbrella valve (an example of a valve body and check valve) 42a: Rod-shaped part 42a1: Expanded diameter part 42b: Valve section 43: Annular elastic cover valve (an example of a cap) 51: Swing shaft 52: Claw receiving part 52a: Through hole 100: Infusion pump 120: Display section 130:Operation unit 131: Fast forward switch 132: Start switch 133: Stop switch 134: Power switch 140: Liquid delivery unit 151: Receiving part 151a: Through hole 152: Locking claw part 160: Exterior material 200: Syringe 201: Syringe body 201a: Containment Space 202: Male Lure Section 202a: Flow path 203:Cylinder part 203a: Female thread 612: Housing 612a: First flow path 612b: Second flow path 612b1: External communication port 613: Valve body 613a:Slit 614: Top cap 614a: Male thread 615: Bottom cap 616: Holder part 620: Balloon body A: Central axis direction of the inner and outer cylinders B: Radial direction of the inner and outer cylinders C: Circumferential direction of the inner and outer cylinders E1: End of the first flow path E2: End of the second flow path X: Infusion solution (an example of a liquid)

Claims

1. An injection port that can be installed in a liquid storage portion, a first flow path and a second flow path that, when installed in the liquid storage portion, communicate with the outside and an accommodation space of the liquid storage portion; the first flow path includes a valve body that allows liquid to be injected from the outside into the storage space of the liquid storage unit and that restricts liquid from being discharged from the storage space of the liquid storage unit to the outside; the second flow path includes a filter that restricts discharge of liquid from the storage space of the liquid storage unit to the outside and allows discharge of gas from the storage space of the liquid storage unit to the outside, a flow path end of the first flow path that is connected to the accommodation space is disposed so as to be located closer to an inside of the accommodation space than a flow path end of the second flow path that is connected to the accommodation space, an inner cylinder portion; an outer cylindrical portion that covers the radial outside of the inner cylindrical portion, The first flow path is formed inside the inner cylindrical portion, the second flow path is formed outside the inner cylindrical portion and inside the outer cylindrical portion, The valve body protrudes from the inner cylindrical portion, and the flow path end of the first flow path is formed by a tip of the valve body.

2. The injection port of claim 1 , wherein the valve element is a check valve.

3. The injection port according to claim 1 or 2, further comprising a cap capable of closing the second flow path.

4. An injection port as described in claim 3, wherein the cap is capable of blocking the first flow path and the second flow path.

5. An injection port according to any one of claims 1 to 4; the liquid storage portion in which the injection port is installed.

6. the liquid storage portion includes a case portion having a recess formed therein, and a membrane portion covering the recess and defining the storage space between the case portion and the recess, The liquid container according to claim 5 , wherein the injection port is provided in the case portion.

7. an infusion cartridge as the liquid container according to claim 5 or 6; An infusion pump comprising: a pump body into which the infusion cartridge can be attached.

Images