Fluid pumping device

Abstract

The objective is to improve the strength of the balloon pump when it comes into contact with the container. [Solution] The fluid pumping device 1 comprises a balloon pump 2 which is bag-shaped, elastically expands when fluid A is injected into it, and pumps the fluid A to the outside by the elastic restoring force when it contracts, and a container 3 which houses the balloon pump 2. At least, when the balloon pump 2, which has expanded due to the injection of fluid A, comes into contact with the container 3, the outer surface of the balloon pump 2 is arranged with a base portion 2000a and a protrusion portion 2001a which is connected to the base portion 2000a and protrudes outward relative to the base portion 2000a. On the inner surface of the balloon pump 2, a film thickness adjustment portion 2001b is arranged facing the protrusion portion 2001a in the film thickness direction. The protrusion portion 2001a preferentially comes into contact with the container 3 compared to the base portion 2000a.

Description

Technical Field

[0001] The present disclosure relates to a fluid pumping device used in fields such as medicine and drug discovery, for example.

Background Art

[0002] Patent Document 1 discloses a medical balloon catheter. The balloon catheter includes a catheter and a balloon that can expand and contract. The balloon is attached to the catheter. The balloon catheter is used, for example, when placing a stent at an affected part (for example, an occluded part of a blood vessel).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although not disclosed or suggested in Patent Document 1, a balloon that can expand and contract can be used as a pump (balloon pump). Specifically, first, a desired fluid is injected into the balloon pump to elastically expand the balloon pump, and then the fluid is pumped by discharging the fluid using the elastic restoring force (elastic contraction force) of the balloon pump itself. The balloon pump is stored in a container to ensure an expansion and contraction deformation space. When injecting the fluid, that is, when the balloon pump expands, the outer surface of the balloon pump may contact the inner surface of the container. The fluid pumping device of the present disclosure aims to improve the strength of the balloon pump when it contacts the container.

Means for Solving the Problems

[0005] (1) In order to solve the above problems, the fluid pumping device of the present disclosure comprises a balloon pump which is bag-shaped, elastically expands when fluid is injected into it, and pumps the fluid to the outside by the elastic restoring force when it contracts, and a container which houses the balloon pump, wherein at least when the balloon pump which has expanded due to the injection of the fluid comes into contact with the container, the outer surface of the balloon pump has a base and a protrusion which is connected to the base and protrudes outward from the base, and the inner surface of the balloon pump has a film thickness adjustment part which is opposite to the protrusion in the film thickness direction, and the protrusion preferentially comes into contact with the container with respect to the base.

[0006] Here, the configuration in which the film thickness adjustment section "facing the convex portion in the film thickness direction" includes, for example, a configuration in which, when viewed from the film thickness direction, the entire film thickness adjustment section overlaps the entire convex portion, a configuration in which the entire film thickness adjustment section overlaps a part of the convex portion, a configuration in which a part of the film thickness adjustment section overlaps the entire convex portion, and a configuration in which a part of the film thickness adjustment section overlaps a part of the convex portion. In other words, it includes a configuration in which, when viewed from the film thickness direction, at least a part of the film thickness adjustment section overlaps at least a part of the convex portion.

[0007] In this configuration, a protrusion is positioned on the outer surface of the balloon pump. This improves the strength of the balloon pump when it contacts the container. It also improves the sliding properties of the balloon pump when it slides against the container. Furthermore, a film thickness adjustment section is positioned on the inner surface of the balloon pump, facing the protrusion in the film thickness direction. As a result, the protrusion expands more easily than the base. Therefore, the protrusion can be preferentially pressed against the container compared to the base.

[0008] (1-1) In the configuration of (1) above, the state before the fluid is injected into the balloon pump is called the empty state, and the state at the time when the balloon pump, which has expanded due to the injection of the fluid, comes into contact with the container is called the contact state. The convex portion and the film thickness adjustment portion are positioned on the balloon pump from the empty state to the contact state.

[0009] In this configuration, a protrusion and a film thickness adjustment section are present on the balloon pump from the empty state to the contact state. Therefore, the strength of the balloon pump can be continuously improved during the balloon pump inflation stroke, at least from the empty state to the contact state.

[0010] (1-2) In the configuration of (1-1) above, the balloon pump has a bag-shaped balloon body that can be inflated and deformed, and in the empty state, the protrusion is positioned at the location where the distance between the balloon body and the container is shortest. With this configuration, when transitioning from the empty state to the contact state, the protrusion can be brought into contact with the container quickly and reliably.

[0011] (2) In any of the above configurations, it is preferable that the protrusion be a rib. With this configuration, the strength of the balloon pump (e.g., tensile strength) in the direction of extension of the rib can be improved.

[0012] (2-1) In the configuration of (2) above, the balloon pump has a bag-shaped balloon body that can be expanded and contracted, and the state before the fluid is injected into the balloon pump is considered to be the empty state, and in the empty state, the shape of the balloon body is anisotropic, and the ribs extend in the longitudinal direction of the balloon body, and the total length of the ribs in the longitudinal direction is considered to be 100% of the total length of the balloon body in the longitudinal direction, and the total length of the ribs in the longitudinal direction is in the range of 5% to 100%.

[0013] In this configuration, the total length of the balloon body in the longitudinal direction is set to be within a range of 5% or more, with the total length of the ribs being 100%. Therefore, the tensile strength in the longitudinal direction of the balloon body can be improved compared to the case where it is less than 5%.

[0014] (2-2) In the configuration of (2-1) above, it is preferable that the total length of the ribs in the longitudinal direction be within the range of 80% to 100% of the total length of the balloon body in the longitudinal direction. With this configuration, the tensile strength in the longitudinal direction of the balloon body can be further improved compared to the configuration of (2-1) above.

[0015] (2-3) In any of the configurations described in (2) to (2-2) above, the state before the fluid is injected into the balloon pump is considered to be the empty state, and in the empty state, the balloon pump has multiple corners, and the ribs are arranged at the corners. The corners of the balloon pump are most likely to come into contact with the container at the fastest rate when the balloon pump expands. Also, stress tends to concentrate at the corners. With this configuration, ribs are arranged at the corners. Therefore, the strength of the corners can be improved.

[0016] (2-4) In any of the configurations described in (2) to (2-3) above, the balloon pump has a bag-shaped balloon body that can be expanded and contracted, the ribs extend in the circumferential direction of the balloon body, and the circumferential total length of the ribs is within the range of 5% to 100% of the circumferential total length of the balloon body, with the circumferential total length of the ribs being 100%.

[0017] In this configuration, the total circumferential length of the balloon body is set to be within a range of 5% or more, with the total circumferential length of the ribs being 100%. Therefore, the tensile strength in the circumferential direction of the balloon body can be improved compared to the case where it is less than 5%.

[0018] (2-5) In the configuration described in (2-4) above, it is preferable to have a configuration in which the circumferential total length of the balloon body is 100% and the circumferential total length of the ribs is 100%. With this configuration, the ribs extend along the entire circumferential length of the balloon body. Therefore, the circumferential tensile strength of the balloon body can be improved. In addition, the ribs can be made to contact the container preferentially with respect to the base along the entire circumferential length of the balloon body.

[0019] (3) In any of the configurations described in (2) to (2-5) above, the state before the fluid is injected into the balloon pump is considered the empty state, and the ribs and the film thickness adjustment section are arranged in the balloon pump in the empty state, and the height of the ribs in the empty state is 0.5 mm or more and 5.0 mm or less.

[0020] In this configuration, the rib height is set to 0.5 mm or more when empty. Therefore, the crack strength (resistance to cracking) of the balloon pump can be improved compared to when it is less than 0.5 mm. Also, in this configuration, the rib height is set to 5.0 mm or less when empty. Therefore, the internal pressure behavior of the balloon pump (for example, a rapid increase in internal pressure when the balloon pump inflates, a rapid decrease in internal pressure when the balloon pump deflates, etc.) can be suppressed compared to when it exceeds 5.0 mm.

[0021] (3-1) In any of the configurations described in (2) or (3) above, the state before the fluid is injected into the balloon pump is considered to be the empty state, and the ribs and the film thickness adjustment section are arranged in the balloon pump in the empty state, and the width of the ribs in the empty state is 0.5 mm or more and 8.0 mm or less.

[0022] In this configuration, the rib width is set to 0.5 mm or more when empty. Therefore, the crack strength of the balloon pump can be improved compared to when it is less than 0.5 mm. Also, in this configuration, the rib width is set to 8.0 mm or less when empty. Therefore, the internal pressure behavior of the balloon pump can be suppressed compared to when it exceeds 8.0 mm.

[0023] (4) In any of the above configurations, it is preferable that the container has a container body having a storage chamber for storing the balloon pump and an opening communicating with the storage chamber, and a flow path unit disposed at the opening and capable of supplying and discharging the fluid to and from the balloon pump in the storage chamber. According to this configuration, liquid can be transferred between the balloon pump and the outside (for example, a fluid supply unit that supplies fluid to the balloon pump, a liquid transfer target unit that transfers fluid from the balloon pump, etc.) via the flow path unit.

[0024] (5) In any of the above configurations, with the state before the fluid is injected into the balloon pump being the empty state, the base is disposed on the balloon pump in the empty state, and in the balloon pump, a section having the base on the outer surface is defined as the base section. It is preferable that the film thickness of the base section in the empty state is 1.0 mm or more and 1.8 mm or less.

[0025] According to this configuration, in the empty state, the film thickness of the base section is set to 1.0 mm or more. Therefore, the cracking strength of the balloon pump can be improved as compared with the case where it is less than 1.0 mm. Also, according to this configuration, in the empty state, the film thickness of the base section is set to 1.8 mm or less. Therefore, the internal pressure behavior of the balloon pump can be suppressed as compared with the case where it exceeds 1.8 mm.

[0026] (6) In any of the above configurations, it is preferable that the film thickness adjustment part is a concave part. According to this configuration, the convex part on the outer surface and the concave part on the inner surface of the balloon pump are arranged to face each other in the film thickness direction (the inside-outside direction, the front-back direction). Therefore, when the balloon pump expands, the convex part is likely to protrude outward.

[0027] (6-1) In the configuration of (6) above, with the state before the fluid is injected into the balloon pump being the empty state, the base portion, the convex portion, and the concave portion are arranged on the balloon pump in the empty state. Among the balloon pump, the section having the base portion on the outer surface is defined as the base section, and the section having the convex portion on the outer surface and the concave portion on the inner surface is defined as the uneven section. In the empty state, it is preferable to adopt a configuration in which the film thickness of the uneven section is 60% or more and 90% or less with the film thickness of the base section being 100%.

[0028] According to this configuration, in the empty state, with the film thickness of the base section being 100%, the film thickness of the uneven section is set to 60% or more. Therefore, compared with the case where it is less than 60%, it is possible to suppress the excessive expansion of the convex portion with respect to the base portion. Also, according to this configuration, in the empty state, with the film thickness of the base section being 100%, the film thickness of the uneven section is set to 90% or less. Therefore, compared with the case where it exceeds 90%, it is possible to more reliably and preferentially expand the convex portion with respect to the base portion.

[0029] (7) In the configuration of (6) or (6-1) above, with the state before the fluid is injected into the balloon pump being the empty state, the base portion, the convex portion, and the concave portion are arranged on the balloon pump in the empty state. Among the balloon pump, the section having the convex portion on the outer surface and the concave portion on the inner surface is defined as the uneven section. It is preferable to adopt a configuration in which the film thickness of the uneven section in the empty state is 0.8 mm or more and 1.6 mm or less.

[0030] According to this configuration, in the empty state, the film thickness of the uneven section is set to 0.8 mm or more. Therefore, compared with the case where it is less than 0.8 mm, the cracking strength of the balloon pump can be improved. Also, according to this configuration, in the empty state, the film thickness of the uneven section is set to 1.6 mm or less. Therefore, compared with the case where it exceeds 1.6 mm, when the balloon pump expands, the convex portion is likely to protrude outward.

Advantages of the Invention

[0031] The fluid pumping device of this disclosure can improve the strength of the balloon pump when it comes into contact with the container. [Brief explanation of the drawing]

[0032] [Figure 1] Figure 1 is a vertical cross-sectional view of the fluid pumping device according to the first embodiment. [Figure 2] Figure 2 is a cross-sectional view taken along line II-II in Figure 1. [Figure 3] Figure 3 is an enlarged view of the area within frame III in Figure 1. [Figure 4] Figure 4 is an enlarged view of the area within frame IV in Figure 2. [Figure 5] Figure 5 is a cross-sectional view in the vertical direction of the fluid pumping device in contact with the surrounding area. [Figure 6] Figure 6 is an enlarged view of the area within frame VI in Figure 5. [Figure 7] Figure 7 is a cross-sectional view taken along the line VII-VII in Figure 6. [Figure 8] Figure 8 is a vertical cross-sectional view of the fluid pumping device in its filled state. [Figure 9] Figure 9 is an enlarged view of the area within frame IX in Figure 8. [Figure 10] Figure 10 is a vertical cross-sectional view of the fluid pumping device in the completed pumping state. [Figure 11] Figure 11 is a horizontal cross-sectional view of the balloon pump of the fluid pumping device according to the second embodiment. [Figure 12] Figures 12(A) to 12(D) are unfolded views of the outer surface of the side wall portion of the balloon body of the balloon pump of the fluid pumping device in other embodiments (1 to 4). [Figure 13] Figures 13(A) to 13(P) are schematic cross-sectional views in the short direction of fluid pumping devices of other embodiments (5 to 20). [Modes for carrying out the invention]

[0033] The embodiments of the fluid pumping apparatus of this disclosure will be described below.

[0034] <First Embodiment> [Configuration of Fluid Pumping System] First, the configuration of the fluid pumping device of this embodiment will be described. Figure 1 shows a cross-sectional view of the fluid pumping device of this embodiment in the vertical direction (longitudinal direction, axial direction). Figure 2 shows a cross-sectional view of Figure 1 in the II-II direction (horizontal direction, short direction, radial direction). Figure 3 shows an enlarged view of the area within frame III in Figure 1. Figure 4 shows an enlarged view of the area within frame IV in Figure 2.

[0035] As shown in Figure 1, the fluid pumping device 1 of this embodiment includes a balloon pump 2, a container 3, a hose 4, and a three-way valve 5. Hereinafter, the state in which the pump chamber 202 of the balloon pump 2 is empty will be referred to as the "empty state," the initial state in which the rib 2001a of the balloon pump 2 is in contact with the inner surface 300a of the container 3 will be referred to as the "contact state," and the state in which a predetermined amount of fluid has been filled into the pump chamber 202 will be referred to as the "filled state." All of the states of the fluid pumping device 1 shown in Figures 1 to 4 are in the empty state.

[0036] (Balloon pump 2) As shown in Figures 1 to 4, the balloon pump 2 is made of silicone rubber and has a bag-like shape. When empty, the shape of the balloon pump 2 is anisotropic, being long in the vertical direction and short in the horizontal direction. The balloon pump 2 comprises a balloon body 20 and a port section 21. The balloon body 20 and the port section 21 are integrally connected.

[0037] As shown in Figures 3 and 4, the balloon body 20 comprises a side wall 200, a bottom wall 201, a pump chamber 202, and an opening 203. The side wall 200 has a long cylindrical (straight tube) shape in the vertical direction. The horizontal cross-sectional shape of the side wall 200, i.e., the balloon body 20, is a perfect circular ring. The side wall 200 comprises a plurality of base sections 2000 and a plurality of uneven sections 2001. The base sections 2000 and the uneven sections 2001 extend along the entire length of the side wall 200 in the vertical direction (longitudinal direction).

[0038] The outer and inner surfaces of the base section 2000 are smooth surfaces (smooth curved surfaces) without any irregular shapes. An outer base 2000a is located on the outer surface of the base section 2000. The outer base 2000a is included in the concept of "base" in this disclosure. An inner base 2000b is located on the inner surface of the base section 2000.

[0039] The uneven section 2001 is located between any pair of adjacent base sections 2000 in the circumferential direction (circumferential direction of the horizontal (short side) cross-sectional shape of the side wall section 200). The uneven section 2001 extends in the vertical direction. The uneven section 2001 is connected to the base section 2000. The uneven section 2001 comprises a rib 2001a and a groove 2001b.

[0040] Rib 2001a is positioned on the outer surface of the uneven section 2001. Rib 2001a is connected to the outer base 2000a. Rib 2001a extends in the vertical direction (longitudinal direction). Rib 2001a protrudes outward from the outer base 2000a (outward in the expansion direction of the balloon pump 2). The horizontal (short-side) cross-sectional shape of rib 2001a is C-shaped.

[0041] The groove 2001b is located on the inner surface of the uneven section 2001. The groove 2001b is included in the concept of a “recess” in this disclosure. The groove 2001b is connected to the inner base 2000b. The groove 2001b is recessed outward relative to the inner base 2000b. The horizontal (short-side) cross-sectional shape of the groove 2001b is C-shaped.

[0042] The ribs 2001a and grooves 2001b face each other in the film thickness direction (inner-outer direction, front-back direction, radial direction). The ribs 2001a and grooves 2001b are continuously present on the balloon pump 2 throughout the entire inflation stroke of the balloon pump 2 (the fluid injection step described later).

[0043] The bottom wall portion 201 seals the opening at the lower end (the other end in the longitudinal direction) of the side wall portion 200. The bottom wall portion 201 has a curved wall shape (hemispherical wall shape) that protrudes downward. The opening 203 is located at the upper end (one end in the longitudinal direction) of the side wall portion 200. A tapered portion 203a that tapers from the top to the bottom is located at the upper end (opening end) of the opening 203. The pump chamber 202 is partitioned inside the balloon body 20. The opening 203 communicates with the pump chamber 202. Fluid is injected into the pump chamber 202 from the outside through the opening 203. Fluid is also pumped from the pump chamber 202 to the outside through the opening 203.

[0044] The balloon body 20 expands elastically when fluid is injected from the syringe 90 into the pump chamber 202. Furthermore, the elastic restoring force during contraction (the fluid pumping step described later) pumps the fluid from the pump chamber 202 to the fluid delivery unit 91. The volume of the pump chamber 202 can expand and contract in accordance with the expansion and contraction deformation of the balloon body 20.

[0045] The port portion 21 has a flange shape. The port portion 21 protrudes radially outward from the upper end of the balloon body 20. The port portion 21 is integrally connected to the upper end of the balloon body 20.

[0046] (container 3) The container 3 comprises a container body 30 and a flow path unit 31. The container body 30 is made of PP (polypropylene) and has a bottomed rectangular tubular shape. The container body 30 comprises a side wall portion 300, a bottom wall portion 301, a storage chamber 302, and an opening 303. The side wall portion 300 has a rectangular tubular shape. The bottom wall portion 301 seals the lower end opening of the side wall portion 300. The opening 303 is located at the upper end of the side wall portion 300. The inner circumferential surface of the opening 303 abuts against the outer circumferential surface of the port portion 21. The storage chamber 302 is partitioned inside the container body 30. The balloon pump 2 is stored in the storage chamber 302. The container body 30 is transparent. Therefore, the balloon pump 2 in the storage chamber 302 can be seen from outside the container body 30.

[0047] The flow path unit 31 is made of PP and is detachably positioned on the upper side of the container body 30. The flow path unit 31 comprises a lid 310, a boss (balloon pump connection part) 311, and a flow path 312. The lid 310 seals the opening 303 from above. The boss 311 protrudes downward (towards the storage chamber 302) from the lower surface of the lid 310. The opening 203 of the balloon pump 2 is connected to the boss 311. Specifically, the boss 311 is press-fitted into the opening 203. The inner circumferential surface of the opening 203 is in pressure contact with the outer circumferential surface of the boss 311. The port 21 is positioned from both radial sides by the outer circumferential surface of the boss 311 and the inner circumferential surface of the opening 303. The flow path 312 penetrates the flow path unit 31 in the vertical direction. The upper end of the flow path 312 opens to the upper surface (outer surface) of the lid portion 310, and the lower end of the flow path 312 opens to the lower surface (inner surface) of the boss portion 311. The lower end of the flow path 312 is in communication with the pump chamber 202.

[0048] (Hose 4) Hose 4 is connected to flow path unit 31. Hose 4 is made of silicone resin and comprises a hose body 40 and a flow rate adjustment section 41. Hose body 40 is composed of two parts: a pump-side section 400 and a flow rate adjustment section 401. A syringe 90, described later, is connected to one longitudinal end of the pump-side section 400 (the upstream end when fluid is injected into the pump chamber 202). The other longitudinal end of the pump-side section 400 (the downstream end when fluid is injected into the pump chamber 202) is press-fitted into the upper end of the flow path 312 of the flow path unit 31. One longitudinal end of the flow rate adjustment section 41 (the upstream end when fluid is discharged from the pump chamber 202) is connected to the other longitudinal end of the flow rate adjustment section 401 (the downstream end when fluid is discharged from the pump chamber 202). The flow rate adjustment section 41 has a smaller inner diameter (flow path cross-sectional area) than the hose body 40. The other end of the flow rate adjustment unit 41 in the longitudinal direction (the downstream end when the fluid is discharged from the pump chamber 202) is connected to the fluid delivery target unit 91.

[0049] (Three-way dialect 5) The three-way valve (flow path switching section) 5 is positioned between the pump-side section 400 and the flow rate adjustment section 401. The pump-side section 400, the flow rate adjustment section 401, and the syringe (fluid supply section) 90 are connected to the three-way valve 5. The flow rate adjustment section 401 and the syringe 90 can be selectively connected to the pump-side section 400 via the three-way valve 5.

[0050] [Operation of the fluid pumping device] Next, the operation of the fluid pumping device of this embodiment will be described. The operation of the fluid pumping device includes a fluid injection step and a fluid pumping step.

[0051] (Fluid injection step) Figure 5 shows a vertical cross-sectional view of the fluid pumping device of this embodiment in the contact state. Figure 6 shows an enlarged view of the area within frame VI in Figure 5. Figure 7 shows a cross-sectional view of Figure 6 in the direction of VII-VII. Figure 8 shows a vertical cross-sectional view of the same fluid pumping device in the filled state. Figure 9 shows an enlarged view of the area within frame IX in Figure 8.

[0052] In this step, a predetermined amount of fluid A is injected from syringe 90 into the pump chamber 202 of balloon pump 2. That is, the fluid pumping device 1 is switched from the empty state shown in Figure 1, through the contact state shown in Figure 5, to the filled state shown in Figure 8.

[0053] First, as shown in Figure 1, the three-way valve 5 is switched to a position where the syringe 90 and the balloon pump 2 are in communication. Next, fluid (liquid) A is injected from the syringe 90 into the pump chamber 202 via the three-way valve 5, the pump-side section 400, and the flow path 312. As fluid A is injected, the balloon body 20 expands elastically while accumulating elastic restoring force (elastic energy). Due to the expansion of the balloon body 20, the rib 2001a comes into contact with the inner surface 300a of the side wall portion 300 of the container 3. That is, the fluid pumping device 1 transitions from the empty state shown in Figure 1 to the contact state shown in Figure 5. As shown in Figures 6 to 7, in the contact state, of the rib 2001a and the outer base portion 2000a, only the rib 2001a comes into contact with the inner surface 300a. Due to the contact, a contact area B is formed between the rib 2001a (balloon pump 2) and the inner surface 300a (container 3).

[0054] As the injection of fluid A continues, the balloon body 20 expands mainly downwards, as shown in Figure 8. During this process, as shown in Figures 6 and 9, the ribs 2001a slide mainly downwards against the inner surface 300a. In addition, the area of ​​the contact portion B (the contact area between the balloon pump 2 and the container 3) increases mainly in the vertical direction.

[0055] When the amount of fluid A injected reaches a predetermined amount, the injection is stopped. In this way, the fluid pumping device 1 transitions from the contact state shown in Figure 5 to the filled state shown in Figure 8.

[0056] (Fluid pumping step) Figure 10 shows a vertical cross-sectional view of the fluid pumping device in the completed pumping state of this embodiment. In this step, a predetermined amount of fluid A is pumped from the pump chamber 202 of the balloon pump 2 to the fluid to be pumped section 91. That is, the fluid pumping device 1 is switched from the filled state shown in Figure 8 to the completed pumping state shown in Figure 10.

[0057] First, as shown in Figure 10, the three-way valve 5 is switched to a position that connects the balloon pump 2 and the fluid to be delivered section 91. Next, fluid A is pumped from the pump chamber 202 to the fluid to be delivered section 91 via the flow path 312, the pump-side section 400, the three-way valve 5, the flow rate adjustment section 401, and the flow rate adjustment section 41. As fluid A is pumped, the balloon body 20 elastically contracts while consuming its accumulated elastic restoring force. Due to the contraction of the balloon body 20, the fluid pumping device 1 transitions from the filled state shown in Figure 8 to the pumping completion state shown in Figure 10. In this way, the fluid pumping device 1 is used.

[0058] [Effects and Effects] Next, the effects of the fluid pumping device of this embodiment will be described. As shown in Figures 5 to 7, at least in the contact state, the outer surface of the balloon pump 2 is provided with an outer base 2000a and a rib 2001a. The rib 2001a preferentially contacts the container 3 compared to the outer base 2000a. Therefore, the strength of the balloon pump 2 when it contacts the container 3 can be improved.

[0059] As shown in Figures 8 and 9, when transitioning from the contact state to the filling state, the rib 2001a slides mainly downward against the inner surface 300a. On the other hand, as shown in Figure 7, the outer base 2000a does not contact the inner surface 300a. Furthermore, even if the outer base 2000a were to contact the inner surface 300a, the rib 2001a would preferentially slide against the container 3 relative to the outer base 2000a. This improves the sliding performance of the balloon pump 2.

[0060] As shown in Figures 5 to 9, a groove 2001b is located on the inner side of the rib 2001a in the film thickness direction. Therefore, the rib 2001a is more likely to expand outward than the outer base 2000a. Consequently, the rib 2001a can be preferentially pressed against the container 3 compared to the outer base 2000a.

[0061] In the empty state (Figures 1-4), the contact state (Figures 5-7), and the filled state (Figures 8-9), the balloon pump 2 continuously exhibits ribs 2001a and grooves 2001b. That is, the ribs 2001a and grooves 2001b are positioned on the balloon pump 2 from the empty state through the contact state to the filled state. Therefore, the strength of the balloon pump 2 can be continuously improved throughout the entire inflation stroke (fluid injection step) of the balloon pump 2. In addition, throughout the entire inflation stroke of the balloon pump 2, the ribs 2001a tend to expand outward more easily than the outer base portion 2000a.

[0062] As shown in Figures 1 and 2, in the empty state, the rib 2001a is positioned at the location where the distance C between the outer surface of the balloon body 20 and the inner surface 300a of the side wall portion 300 is shortest. Therefore, when transitioning from the empty state to the contact state (Figures 5 and 7), the rib 2001a can be brought into contact with the container 3 quickly and reliably.

[0063] The rib 2001a extends in the vertical direction. Therefore, the strength (e.g., tensile strength) of the balloon pump 2 in the vertical direction (the direction in which the rib 2001a extends) can be improved.

[0064] As described above, the extension direction of the rib 2001a is vertical. Also, as shown in Figures 8 and 9, the expansion direction of the balloon pump 2 when transitioning from the contact state to the filling state is vertical. In other words, the extension direction of the rib 2001a and the expansion direction of the balloon pump 2 coincide. Therefore, the sliding resistance of the balloon pump 2 against the container 3 can be reduced.

[0065] As shown in Figures 1 and 2, in the empty state, the shape of the balloon body 20 is anisotropic, being longer in the vertical direction and shorter in the horizontal direction. The rib 2001a extends in the vertical direction (the longitudinal direction of the balloon body 20). As shown in Figure 3, with the total vertical length D of the balloon body 20 set to 100%, the total vertical length E of the rib 2001a is set to 90% (the total vertical length of the side wall portion 200). In other words, with the total vertical length D of the balloon body 20 set to 100%, the total vertical length E of the rib 2001a is set to fall within the range of 5% to 100%, and further within the range of 80% to 100%. Therefore, the tensile strength of the balloon body 20 in the vertical direction can be improved.

[0066] As shown in Figures 1 and 2, in the empty state, the shortest distance C of the balloon body 20 is at the side wall 200. As shown in Figure 3, the total vertical length F of the side wall 200 is set to 100%, and the total vertical length E of the rib 2001a is set to 100%. That is, the rib 2001a is arranged along the entire vertical length of the side wall 200. Therefore, the tensile strength can be improved along the entire vertical length F of the side wall 200 (the section where the distance C is shortest). In addition, the rib 2001a can be preferentially brought into contact with the container 3 relative to the outer base 2000a along the entire vertical length F of the side wall 200.

[0067] As shown in Figure 4, in the empty state, the height (height in the film thickness direction) G of the rib 2001a is set to 0.5 mm or more. Therefore, compared to the case where it is less than 0.5 mm, the crack strength (resistance to cracking) of the balloon pump 2 can be improved. Also, in the empty state, the height G of the rib is set to 5.0 mm or less. Therefore, compared to the case where it exceeds 5.0 mm, the internal pressure behavior of the balloon pump 2 (for example, the rapid increase in internal pressure when the balloon pump 2 is inflated, the rapid decrease in internal pressure when the balloon pump 2 is deflated, etc.) can be suppressed.

[0068] As shown in Figure 4, in the empty state, the width (circumferential width) H of rib 2001a is set to 0.5 mm or more. Therefore, the crack strength of the balloon pump 2 can be improved compared to the case where it is less than 0.5 mm. Also, in the empty state, the width H of rib 2001a is set to 8.0 mm or less. Therefore, the internal pressure behavior of the balloon pump 2 can be suppressed compared to the case where it exceeds 8.0 mm.

[0069] As shown in Figure 1, the container 3 is equipped with a flow path unit 31. Therefore, fluid can be transferred between the balloon pump 2 and the outside (for example, a syringe (fluid supply unit) 90, a fluid delivery target unit 91) via the flow path unit 31.

[0070] As shown in Figure 4, in the empty state, the film thickness I of the base section 2000 is set to 1.0 mm or more. Therefore, the crack strength of the balloon pump 2 can be improved compared to the case where it is less than 1.0 mm. Also, in the empty state, the film thickness I of the base section 2000 is set to 1.8 mm or less. Therefore, the internal pressure behavior of the balloon pump 2 can be suppressed compared to the case where it exceeds 1.8 mm.

[0071] As shown in Figures 4 and 7, the rib 2001a and the groove 2001b are positioned opposite each other in the film thickness direction (inner-outer direction, front-back direction, radial direction). Therefore, when the balloon pump 2 inflates, the rib 2001a tends to protrude outward.

[0072] As shown in Figure 4, in the empty state, the film thickness J of the uneven section 2001 is smaller than the film thickness I of the base section 2000. Therefore, the rib 2001a can be expanded more reliably and preferentially relative to the outer base section 2000a.

[0073] Furthermore, with the film thickness I of the base section 2000 set to 100%, the film thickness J of the uneven section 2001 is set to 60% or more. Therefore, compared to the case where it is less than 60%, excessive expansion of the rib 2001a relative to the outer base section 2000a can be suppressed. Also, in the empty state, with the film thickness I of the base section 2000 set to 100%, the film thickness J of the uneven section 2001 is set to 90% or less. Therefore, compared to the case where it exceeds 90%, the rib 2001a can be expanded more reliably and preferentially relative to the outer base section 2000a.

[0074] As shown in Figure 4, in the empty state, the film thickness J of the uneven section 2001 is set to 0.8 mm or more. Therefore, the crack strength of the balloon pump 2 can be improved compared to the case where it is less than 0.8 mm. Also, in the empty state, the film thickness J of the uneven section 2001 is set to 1.6 mm or less. Therefore, compared to the case where it exceeds 1.6 mm, the rib 2001a is more likely to protrude outward when the balloon pump 2 inflates.

[0075] As shown in Figure 3, a tapered portion 203a is positioned at the upper end of the opening 203. This makes it easier to press-fit the boss portion 311 into the opening 203 when attaching the balloon pump 2 to the flow path unit 31.

[0076] As shown in Figures 1, 5, and 8, a flow rate adjustment unit 41 is connected to the hose body 40. This allows for adjustment of the flow rate of fluid A during the fluid pumping step. Specifically, the flow rate adjustment unit 41 has a smaller flow path cross-sectional area than the hose body 40. Therefore, the flow rate adjustment unit 41 can restrict the flow rate of fluid A. Consequently, fluid A can be continuously supplied to the fluid delivery unit 91 in small amounts for an extended period of time.

[0077] According to the fluid pumping device 1 of this embodiment, the fluid A can be supplied to the fluid delivery unit 91 without a power source by utilizing the elastic restoring force (elastic contraction force) of the balloon pump 2 itself. Therefore, even when it is difficult to secure a power source (for example, when using it outdoors, during a power outage, or during a disaster), the fluid A can be stably supplied to the fluid delivery unit 91.

[0078] <Second Embodiment> The difference between the fluid pumping device of this embodiment and the fluid pumping device of the first embodiment is that the horizontal (short-side) cross-sectional shape of the balloon body is not a circular ring shape, but an oval ring shape. Also, the horizontal cross-sectional shape of the groove is not C-shaped, but an irregular shape. Here, only the differences will be explained.

[0079] Figure 11 shows a horizontal cross-sectional view of the balloon pump of the fluid pumping device according to this embodiment. Parts corresponding to those in Figure 4 are indicated by the same reference numerals. As shown in Figure 11, in the empty state, the horizontal cross-sectional shape of the side wall portion 200 of the balloon body 20 is elongated in the front-to-back direction and shorter in the left-to-right direction, exhibiting an oval shape (a shape in which a pair of front-to-back arc-shaped membrane portions 204 are connected by a pair of left-to-right flat membrane portions 205). The arc-shaped membrane portions 204 are thinner than the flat membrane portions 205. The uneven sections 2001 are located at the corners 206 of the boundary between the arc-shaped membrane portions 204 and the flat membrane portions 205. Base sections 2000 are located in the sections of the side wall portion 200 other than the uneven sections 2001. The four uneven sections 2001 and the four base sections 2000 are arranged alternately in the circumferential direction.

[0080] The horizontal cross-sectional shape of rib 2001a is C-shaped (a circular arc with constant curvature). In contrast, the horizontal cross-sectional shape of groove 2001b is irregular (an arc with inconsistent curvature).

[0081] The fluid pumping device of this embodiment and the fluid pumping device of the first embodiment have similar effects and advantages with respect to the parts that share a common configuration. As in this embodiment, the horizontal cross-sectional shape of the side wall portion 200 does not have to be a perfect circular ring shape. It may be an oval ring shape. Also, the horizontal cross-sectional shape of the groove portion 2001b does not have to be C-shaped. It may be an irregular shape. Furthermore, the film thickness of the side wall portion 200 does not have to be constant (of course, it may be constant).

[0082] Multiple ribs 2001a are each positioned at a corner 206. The corner 206 is where the balloon body 20 is most likely to contact the container the fastest when it inflates. Also, stress tends to concentrate at the corner 206. According to this embodiment, the ribs 2001a are positioned at the corner 206. Therefore, the strength of the corner 206 can be improved.

[0083] <Other> The embodiments of the fluid pumping apparatus of this disclosure have been described above. However, the embodiments are not particularly limited to the above forms. Various modified and improved forms can be implemented by those skilled in the art.

[0084] [About the structure] Figures 12(A) to 12(D) show unfolded views of the outer surface of the side wall of the balloon body of the balloon pump of the fluid pumping device in other embodiments (1 to 4). The fluid pumping device shown in Figures 12(A) to 12(D) is in an empty state.

[0085] Note that parts corresponding to those in Figure 4 are indicated by the same reference numerals. Also, in Figures 12(A) to 12(D), the 0° position corresponds to the front, the 90° position to the right, the 180° position to the rear, the 270° position to the left, and the 360° position (=0° position) to the front. Furthermore, for the sake of explanation, hatching is applied to rib 2001a and protrusion 2001c.

[0086] As shown in Figure 12(A), the rib 2001a may extend in the vertical direction (the longitudinal direction of the balloon pump 2). As shown in Figure 12(B), the rib 2001a may extend in the circumferential direction (the circumferential direction of the balloon pump 2). As shown in Figure 12(C), multiple ribs 2001a may be arranged in a grid pattern. Thus, the direction of extension of the rib 2001a is not particularly limited. Multiple ribs 2001a may be arranged parallel to each other or intersecting each other. As shown in Figure 12(D), multiple protrusions 2001c may be arranged in an embossed manner in the uneven section 2001.

[0087] The shape of the rib 2001a shown in Figures 12(A) to 12(C) is the same for the groove 2001b (see Figure 4) on the inner surface of the side wall 200. The shape of the protrusion 2001c shown in Figure 12(D) is the same for the recess on the inner surface of the side wall 200. Thus, the shapes of the protrusions and recesses are not particularly limited.

[0088] The configuration of the uneven section 2001 in the empty state (Figures 1-4, 11, 12(A)-12(D)) is not particularly limited. As shown in Figure 4, in the empty state, the film thickness J of the uneven section 2001 should be smaller than the film thickness I of the base section 2000. This allows the rib 2001a to expand preferentially relative to the outer base 2000a.

[0089] For example, only the rib 2001a may be placed in the uneven section 2001. Alternatively, only the groove 2001b may be placed in the uneven section 2001. Alternatively, both the rib 2001a and the groove 2001b may be placed in the uneven section 2001. Alternatively, neither the rib 2001a nor the groove 2001b may be placed in the uneven section 2001.

[0090] Thus, in the empty state, at least one of the ribs 2001a and grooves 2001b does not need to be placed in the uneven section 2001. When the balloon pump 2 comes into contact with the container 3, that is, in the contact state (Figures 5 to 7), it is sufficient that the ribs 2001a that come into contact with the container 3 are placed in the uneven section 2001.

[0091] The configuration in which the balloon pump 2 contacts the container 3 in the contact state is not particularly limited. Only the rib 2001a may contact the container 3. Both the rib 2001a and the outer base 2000a may contact the container 3. In other words, it is sufficient that at least the rib 2001a of the rib 2001a and the outer base 2000a contacts the container 3.

[0092] In the embodiment shown in Figure 12(B), the circumferential total length of the side wall portion 200, i.e., the balloon body 20, is set to 100%, and the circumferential total length of the rib 2001a is set to 100% (the circumferential total length of the side wall portion 200). That is, with the circumferential total length of the balloon body 20 being set to 100%, the circumferential total length of the rib 2001a is set to fall within the range of 5% to 100%, and further within the range of 80% to 100%. As a result, the circumferential tensile strength of the balloon body 20 can be improved.

[0093] Figures 13(A) to 13(P) show schematic cross-sectional views in the short direction (radial direction) of other embodiments (Nos. 5 to 20) of the fluid pumping device. The fluid pumping device shown in Figures 13(A) to 13(P) is in an empty state.

[0094] Note that parts corresponding to those in Figure 4 are indicated by the same reference numerals. Also, for the sake of explanation, the balloon pump 2 and container 3 are shown as lines. Furthermore, the uneven section 2001 is indicated by dots or thick lines. When the uneven section 2001 is represented by dots, a single rib 2001a and a single groove 2001b are arranged in the uneven section 2001, as shown in Figure 4. When the uneven section 2001 is represented by thick lines, multiple ribs 2001a and multiple grooves 2001b are arranged in the uneven section 2001.

[0095] As shown in Figures 13(A) to 13(P), the cross-sectional shape in the short direction of the balloon pump 2 in the empty state (see Figures 1 to 4 and Figure 11) is not particularly limited. It may be anisotropic, as shown in Figures 13(B), 13(D), 13(F), 13(H), 13(J), 13(L), ​​13(N), and 13(P). It may also be isotropic, as shown in Figures 13(A), 13(C), 13(E), 13(G), 13(I), 13(K), 13(M), and 13(O). For example, it may be a polygon (triangle, quadrilateral, hexagon, octagon, etc.), a circle (perfect circle, ellipse, oblong, etc.), etc.

[0096] Similarly, the cross-sectional shape of the container 3 in the short-side direction when empty is not particularly limited. It may be anisotropic, as shown in Figures 13(E) to 13(H) and 13(M) to 13(P). It may also be isotropic, as shown in Figures 13(A) to 13(D) and 13(I) to 13(L).

[0097] The above-described configuration of the short-direction cross-sectional shape of the balloon pump 2 and container 3 in the empty state is also the same for the longitudinal (axial) cross-sectional shape of the balloon pump 2 in each state (empty state (Figures 1-4, 11, 12(A)-12(D), 13(A)-13(P)), contact state (Figures 5-7), filled state (Figures 8-9), and pumping completed state (Figure 10)). The same is also true for the longitudinal cross-sectional shape of the container 3 in each state.

[0098] As shown in Figures 13(A), 13(F), 13(K), and 13(P), the balloon pump 2 and the container 3 may be similar in shape when empty. As shown in Figures 13(B) to 13(E), 13(G) to 13(J), and 13(L) to 13(O), the balloon pump 2 and the container 3 may not be similar in shape when empty.

[0099] The same applies to the similarities and differences (similarity, dissimilarity) in the shapes of the balloon pump 2 and container 3 in the empty state described above, as well as to the cross-sectional shapes in the short direction of the balloon pump 2 and container 3 in the contact state, the filled state, and the pumping completion state. The same also applies to the cross-sectional shapes in the long direction of the balloon pump 2 and container 3 in each state.

[0100] As shown in Figures 13(A) to 13(H), any single uneven section 2001 may have a single rib and a single groove. As shown in Figures 13(I) to 13(P), any single uneven section 2001 may have multiple ribs and multiple grooves. In any single uneven section 2001, the number of ribs and grooves may be the same or different.

[0101] As shown in Figures 13(A) to 13(P), the position, size, and number of the uneven sections 2001 in the balloon pump 2 are not particularly limited. The position of the ribs 2001a is not particularly limited. As shown in Figures 1 and 2, for example, the uneven sections 2001 may be positioned at the location where the distance C between the outer surface of the balloon body 20 and the inner surface 300a of the side wall 300 is shortest. The uneven sections 2001 should be positioned at the part that the balloon pump 2 reaches fastest when it contacts the inner surface 300a. The uneven sections 2001 may be positioned over the entire side wall 200 or in part thereof. Similarly, the uneven sections 2001 may be positioned over the entire bottom wall 201 or in part thereof.

[0102] The cross-sectional shape of the rib 2001a and groove 2001b in the short direction shown in Figure 4 is not particularly limited. It may be arc-shaped (the curvature may be constant or inconsistent), V-shaped, U-shaped, C-shaped, etc. The longitudinal extension shape of the rib 2001a and groove 2001b shown in Figure 3 is not particularly limited. It may be straight, curved (the curvature may be constant or inconsistent), wavy (rectangular wave, sinusoidal wave, etc.), broken line, etc.

[0103] The positional relationship between the rib 2001a and the groove 2001b shown in Figure 4 is not particularly limited. The rib 2001a and the groove 2001b may or may not be facing each other in the film thickness direction. For example, the rib 2001a and the groove 2001b may be partially offset from each other in the circumferential direction. When viewed from the film thickness direction, the rib 2001a and the groove 2001b may partially overlap.

[0104] As shown in Figure 4, the circumferential width (width H) of the rib 2001a and the circumferential width of the groove 2001b may be the same. Alternatively, the circumferential width of the groove 2001b may be larger than that of the rib 2001a. Conversely, the circumferential width of the groove 2001b may be smaller than that of the rib 2001a.

[0105] The orientation of the balloon pump 2 is not particularly limited. The longitudinal direction of the balloon pump 2 may be vertical, horizontal (front-to-back, left-to-right), or in a direction intersecting these directions.

[0106] The amount of fluid A stored in the pump chamber 202 in the filled state (Figures 8-9) is not particularly limited. The differences between the filled state (Figures 8-9) and the contact state (Figures 5-7) are not particularly limited. For example, the filled state may be the state before the contact state (an intermediate state between the empty state (Figures 1-4) and the contact state). Alternatively, the filled state may be the contact state. Specifically, the amount of fluid A stored may be adjusted so that a predetermined amount of fluid A is stored in the pump chamber 202 in the contact state. Alternatively, the filled state may be the state after the contact state. Specifically, as shown in Figures 5-6 and 8-9, after the contact state, the balloon pump 2 may be expanded while sliding against the container 3 until a predetermined amount of fluid A is stored in the pump chamber 202.

[0107] When transitioning from the contact state (Figures 5-7) to the filled state (Figures 7-8), the extension direction of the rib 2001a and the expansion direction of the balloon pump 2 may or may not coincide.

[0108] If the extension direction of the rib 2001a includes the expansion direction of the balloon pump 2, the sliding resistance of the balloon pump 2 to the container 3 can be reduced. For example, as shown in Figures 5 and 8, if the expansion direction of the balloon pump 2 is vertical, the extension direction of the rib 2001a only needs to include at least a vertical component. In other words, the extension direction of the rib 2001a only needs to include a circumferential component.

[0109] The connection mechanism between the container body 30 and the flow path unit 31 is not particularly limited. For example, the flow path unit 31 may be joined to the container body 30 in a way that makes it impossible to attach or detach (e.g., by bonding or welding). Alternatively, the flow path unit 31 may be screwed to the container body 30 in a way that makes it easy to attach or detach (e.g., by screw fastening or bolt fastening). Alternatively, the flow path unit 31 may be locked to the container body 30 in a way that makes it easy to attach or detach (e.g., by claw engagement or clip engagement). Alternatively, the flow path unit 31 may be placed on top of the container body 30.

[0110] The type of fluid to be delivered to the fluid delivery unit 91 (i.e., the use of the fluid delivery device 1) is not particularly limited. The fluid to be delivered to the fluid delivery unit 91 may be living organisms (humans, animals, plants), experimental equipment, etc. The type of fluid (liquid, gel, etc.) A is not particularly limited. It may be medicine, body fluids (blood, tissue fluid, lymph), water, liquid fertilizer, etc. The type of fluid supply unit that supplies fluid A to the balloon pump 2 is not particularly limited. It may be a syringe 90, a pump, a tank, etc.

[0111] [About the materials] The material of the balloon pump 2 is not particularly limited. It just needs to have enough elasticity to allow for expansion and contraction, and enough pressure resistance to withstand the internal pressure (fluid pressure applied to the balloon pump 2 from the fluid A in the pump chamber 202). For example, it may be made of an elastomer such as thermosetting elastomer materials such as silicone rubber, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, chloroprene rubber, acrylic rubber, urethane rubber, fluororubber, etc., or thermoplastic elastomer materials such as polyamide thermoplastic elastomer (TPA), polyester thermoplastic elastomer (TPC), olefin thermoplastic elastomer (TPO), styrene thermoplastic elastomer (TPS), urethane thermoplastic elastomer (TPU), or dynamically crosslinked thermoplastic elastomer (TPV). At least the balloon body 20 of the balloon pump 2 just needs to have elasticity (e.g., rubber elasticity). The balloon body 20 and the port part 21 may be an integrated unit or separate parts. In other words, the balloon pump 2 may be a single unit or a composite of multiple components. The light transmittance of the balloon pump 2 is not particularly limited. The balloon pump 2 may be opaque or transparent (colorless transparent, colored transparent). If the fluid (e.g., a drug) A is susceptible to the effects of light, making the balloon pump 2 opaque can suppress the deterioration of the fluid A. If the balloon pump 2 is transparent, the state of the pump chamber 202 (presence or absence of fluid A, amount of fluid A stored, etc.) can be visually observed from outside the balloon pump 2 (including with the naked eye, as well as using a magnifying glass or microscope).

[0112] The material of container 3 is not particularly limited. It may be elastomer, resin, metal, etc. Similar to balloon pump 2, the light transmittance of container 3 is not particularly limited. Container 3 may be opaque or transparent. If container 3 is transparent, the balloon pump 2 in the storage chamber 302 can be seen from outside container 3. Container 3 should be more rigid than balloon pump 2. This makes it easier to secure the volume of the storage chamber 302 (the expansion space for balloon pump 2). [Explanation of symbols]

[0113] 1: Fluid pumping device, 2: Balloon pump, 20: Balloon body, 200: Side wall section, 2000: Base section, 2000a: Outer base (base), 2000b: Inner base, 2001: Uneven section, 2001a: Rib, 2001b: Groove (recess), 2001c: Convex section, 201: Bottom wall section, 202: Pump chamber, 203: Opening, 203a: Tapered section, 204: Arc membrane section, 205: Flat membrane section, 206: Corner section, 21: Port section, 3: Container, 30: Container body, 300: Side wall section, 300a: Inner surface, 301: Bottom wall section, 302: Storage chamber, 303: Opening, 31: Flow path unit, 310: Lid section, 311: Boss section, 312: Flow path, 4: Hose, 40: Hose body, 400: Pump side section, 401: Flow rate adjustment section side section, 41: Flow rate adjustment section, 5: Three-way valve, 90: Syringe, 91: Liquid delivery target section, A: Fluid, B: Contact section

Claims

1. A balloon pump that is bag-shaped, expands elastically when a fluid is injected into it, and pumps the fluid to the outside by the elastic restoring force when it contracts, A container for housing the balloon pump, A fluid pumping device comprising, At least when the balloon pump, which has expanded due to the injection of the fluid, comes into contact with the container, The outer surface of the balloon pump is provided with a base and a protrusion connected to the base and projecting outward relative to the base. On the inner surface of the balloon pump, a film thickness adjustment section is arranged facing the film thickness direction of the protrusion. The fluid pumping device is characterized in that the protrusion preferentially contacts the container with respect to the base.

2. The fluid pumping device according to claim 1, wherein the convex portion is a rib.

3. The state before the fluid is injected into the balloon pump is defined as the empty state. The ribs and the film thickness adjustment section are located in the balloon pump in the empty state. The height of the rib in the empty state is 0.5 mm or more and 5.0 mm or less. The fluid pumping device according to claim 2, wherein the width of the rib in the empty state is 0.5 mm or more and 8.0 mm or less.

4. The aforementioned container is A container body having a storage chamber for housing the balloon pump and an opening communicating with the storage chamber, A flow path unit is provided at the opening and capable of supplying and discharging the fluid to the balloon pump in the storage chamber, A fluid pumping device according to claim 1, having the following features.

5. The state before the fluid is injected into the balloon pump is defined as the empty state. The base is positioned in the balloon pump in the empty state, Of the balloon pump, the section having the base on its outer surface is defined as the base section. The fluid pumping device according to claim 1, wherein the film thickness of the base section in the empty state is 1.0 mm or more and 1.8 mm or less.

6. The fluid pumping device according to claim 1, wherein the film thickness adjustment section is a recess.

7. The state before the fluid is injected into the balloon pump is defined as the empty state. The base, the convex portion, and the concave portion are arranged in the balloon pump in the empty state. Of the balloon pump, the section having the protrusions on its outer surface and the recesses on its inner surface is defined as the uneven section. The fluid pumping device according to claim 6, wherein the film thickness of the uneven section in the empty state is 0.8 mm or more and 1.6 mm or less.

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