Reservoir container

Abstract

To solve at least one of problems occurring in a reservoir container in which a balloon is housed in a soft shell.SOLUTION: The reservoir container 100 includes a bottomed cylindrical balloon 110 that is inflated by injection of a liquid, a soft shell 120 that houses the balloon 110, an inlet port 131 through which the liquid flows in, an outlet port 132 through which the liquid flows out, and a flow path forming cylinder 157 that forms a flow path between the inlet port 131 and the outlet port 132 in the balloon 110. A soft portion which is softer than the flow path forming cylinder 157 is provided on the bottom portion side of the balloon 110 of the flow path forming cylinder 157.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to reservoir containers, and more particularly to reservoir containers having soft shells. [Background technology]

[0002] A reservoir container using a balloon is used to continuously administer a drug solution into the body. The reservoir container has a drug solution storage section called a balloon made of rubber or the like, and is configured so that the drug solution injected into the balloon is continuously delivered by the restoring force of the balloon. There are two types of balloons: one that is housed in a hard shell made of resin that is difficult to deform, and one that is housed in a soft shell made of resin that is easily deformed (see, for example, Patent Document 1).

[0003] The soft shell is configured to deform in response to the inflation of the balloon, and has the advantage over the hard shell that it requires less storage space and generates less waste to be disposed of. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 05-115542 Summary of the Invention [Problem to be solved by the invention]

[0005] Compared to hard shells, soft shells have a lower ability to protect the balloon from external forces. Therefore, it is necessary to design the balloon so that it is as scratch-resistant as possible. However, the balloon generally has an internal tube that acts as an introduction channel. If the internal tube is tilted, the inner surface of the balloon is pressed against the internal tube, which can cause scratches.

[0006] Another problem is that while soft shells are small when stored or disposed of, they are not small enough when administering a drug solution. That is, the bottom side of a balloon, which is usually prone to have a low crosslink density, expands first, and the bottom side deflates last when deflating. This means that the overall size of the soft shell does not decrease significantly even when the drug solution inside decreases.

[0007] The object of the present disclosure is to be able to solve at least one of these problems that arise in a reservoir container in which the balloon is housed in a soft shell. [Means for solving the problem]

[0008] A first aspect of the reservoir container of the present disclosure comprises a cylindrical balloon with a bottom that expands when liquid is injected into it, a soft shell that houses the balloon, an inlet port through which the liquid flows in, an outlet port through which the liquid flows out, and a flow path forming cylinder that forms a flow path between the inlet port and the outlet port within the balloon, and a soft portion that is softer than the flow path forming cylinder is provided on the bottom side of the balloon of the flow path forming cylinder.

[0009] In the first aspect of the reservoir container, a soft portion is provided on the bottom side of the flow path forming tube, which acts as a buffer between the flow path forming tube and the balloon, reducing the situation where the hard flow path forming tube is pressed directly against the inner surface of the balloon, making it less likely that damage will occur inside the balloon.

[0010] In the first aspect of the reservoir container, the soft portion can have an extension portion located closer to the bottom of the balloon than the flow path forming cylinder. Since the extension portion does not have a hard flow path forming cylinder inside, it can easily elastically deform, making it less likely to damage the inner surface of the balloon.

[0011] In a first aspect of the reservoir container, the extension portion can have a first opening that communicates with the flow path forming cylinder and guides the liquid inside the balloon toward the outlet port, and a second opening that guides the liquid into the inside of the balloon can be provided closer to the mouth of the balloon than the extension portion. By providing the first opening that guides the liquid toward the outlet port in the extension portion of the soft portion and providing the first opening that guides the liquid into the balloon closer to the mouth, which is lower than the extension portion during priming, it is possible to prevent air bubbles from remaining in the balloon during priming. Furthermore, by providing an opening in the extension portion of the soft portion, the soft portion can be used as a flow path, and the length of the flow path forming cylinder can be shortened. By shortening the length of the flow path forming cylinder, it is possible to more effectively prevent the flow path forming cylinder from being pressed against the inner surface of the balloon.

[0012] In a first aspect of the reservoir container, the inflation portion of the balloon has a thin-walled tubular portion and a thick-walled tubular portion located closer to the bottom than the thin-walled tubular portion and thicker than the thin-walled tubular portion, and can be configured to collapse from the bottom side as the liquid is discharged. This configuration reduces the size of the bottom of the soft shell as the liquid is discharged, making it less likely that the overall size of the soft shell will remain large even when the amount of medicinal liquid in the balloon is decreasing, thereby improving convenience.

[0013] A second type of reservoir container comprises a cylindrical balloon with a bottom that expands when liquid is injected into it, a soft shell that houses the balloon, an inlet port for the liquid to flow in, and an outlet port for the liquid to flow out, and the expanding part of the balloon has a thin-walled cylindrical portion and a thick-walled cylindrical portion that is located closer to the bottom than the thin-walled cylindrical portion and is thicker than the thin-walled cylindrical portion, and collapses from the bottom side when liquid is discharged.

[0014] In the second embodiment of the reservoir container, the thick-walled cylindrical portion, which is thicker than the thin-walled cylindrical portion, is located on the bottom side, and the balloon deflates from the bottom side, allowing the entire soft shell to shrink in accordance with the amount of liquid in the balloon. This makes it less likely that the overall size of the soft shell will remain large even when the amount of drug solution in the balloon is low, improving convenience.

[0015] In the second aspect of the reservoir container, the inflation portion can be formed such that at least a portion of the side wall has an outer diameter that increases toward the bottom, and the thickness of the side wall gradually increases toward the bottom. This configuration makes it easy to form a balloon with a thick-walled cylindrical portion on the bottom side. [Effects of the Invention]

[0016] The reservoir container of the present disclosure can solve at least one of the problems that arise in a reservoir container in which a balloon is housed in a soft shell. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a plan view showing a reservoir container according to one embodiment. [Figure 2] FIG. 3 is an enlarged cross-sectional view showing a main part of the reservoir container. [Figure 3] FIG. 1 is a cross-sectional view showing an example of a balloon. [Figure 4] FIG. 10 is a cross-sectional view showing a modified example of the balloon. [Figure 5A] 10 is a photograph showing a balloon having a thick-walled cylindrical portion in an inflated state. [Figure 5B] 1 is a photograph showing an inflated balloon having a constant wall thickness. [Figure 5C] 10 is a photograph showing a state in which a balloon having a thick-walled cylindrical portion is further inflated. [Figure 6] FIG. 10 is a cross-sectional view showing a second modified example of the balloon. DETAILED DESCRIPTION OF THE INVENTION

[0018] As shown in Figures 1 and 2, the reservoir container 100 according to the first embodiment includes a bag-shaped soft shell 120, a base member 130 attached to the mouth of the soft shell 120, and a balloon 110 fixed to the base member and housed within the soft shell 120. The soft shell 120 can be made of a soft resin. The soft shell 120 can be made transparent or translucent so that the balloon 110 inside can be visually observed. The balloon 110 can be made of an elastic material such as rubber or elastomer.

[0019] An inlet port 131 and an outlet port 132 are formed in the portion of the base member 130 that is exposed to the outside of the soft shell 120. An inner tube 133 that is located inside the balloon 110 and has an inner cavity 133a is formed in the portion of the base member 130 that is housed within the soft shell 120. The inner tube 133 has a relatively large diameter base portion 151 provided on the base member 130 side, an intermediate portion 153 that is smaller in diameter than the base portion and is located on the bottom side of the balloon 110, and a flow path forming tube 157 that is smaller in diameter than the intermediate portion 153 and protrudes on the bottom side of the balloon 110.

[0020] The mouth of the balloon 110 is fitted onto the base 151 of the inner tube 133, and the outer tube 152 is fitted onto the mouth of the balloon 110 that is fitted onto the base 151. The base 151 and the outer tube 152 that sandwich the mouth of the balloon 110 function as a balloon fixing part 135 that fixes the balloon 110. The part of the balloon 110 that is sandwiched and fixed between the base 151 and the outer tube 152 becomes a fixed part that does not deform even when a medicinal solution is injected, and the part on the bottom side of the fixed part becomes an expanding part that expands when a medicinal solution is injected.

[0021] A sidewall opening 154 communicating with the lumen 133a is provided in the middle portion 153 of the inner tube 133. The opposite end of the lumen 133a is connected to the inlet port 131 via a first internal flow path 137 formed inside the base member 130. The middle portion 153 of the inner tube 133 is not in close contact with the inner surface of the balloon 110, and functions as a liquid inflow portion through which liquid flows into the interior of the balloon 110 from the sidewall opening 154.

[0022] An internal cylinder 156 is formed penetrating the lumen 133a of the internal cylinder 133, and the internal cylinder 156 extends beyond the position of the side wall opening 154 and is connected to a flow path forming cylinder 157. The end of the internal cylinder 156 opposite the flow path forming cylinder 157 is connected to the outlet port 132 via a second internal flow path 138 formed inside the base member 130. Therefore, the portion of the internal cylinder 133 where the flow path forming cylinder 157 is located functions as a liquid outflow portion that allows the liquid inside the balloon 110 to flow out.

[0023] Liquid injected through the inlet port 131 flows into the balloon 110 through the first internal flow path 137, the lumen 133a of the inner cylinder 133, and the side wall opening 154. A check valve (not shown) is provided in the first internal flow path 137, allowing liquid to flow from the inlet port 131 side to the balloon 110 side but preventing liquid from flowing back from the balloon 110 side to the inlet port 131 side. As the balloon 110 contracts, the liquid inside the balloon 110 passes through the flow path forming cylinder 157, the inner cylinder 156, and the second internal flow path 138 and is discharged to the outside through the outlet port 132. Alternatively, the flow path forming cylinder 157 may be connected to the inlet port 131 and the side wall opening 154 may be connected to the outlet port 132, allowing liquid to flow into the balloon 110 from the flow path forming cylinder 157 side and flow out of the balloon 110 from the side of the side wall opening 154 side. Furthermore, the configuration of the flow path that guides the liquid from the inlet port into the balloon and the flow path that guides the liquid from the inside of the balloon to the outlet port is not limited to the above configuration, and various other configurations can be used.

[0024] If the reservoir container is tilted obliquely while the balloon is inflated, the flow path forming cylinder and the balloon will come into contact. This may damage the inner surface of the balloon, causing liquid leakage or even rupture. Because the soft shell is exposed to the external environment and is more susceptible to damage than the hard shell, there is a possibility that liquid leaking from the balloon may leak out.

[0025] In this embodiment, a tube 158, which is a soft part, is fitted onto the outside of the flow path forming cylinder 157 that extends into the balloon 110. Because the tube 158, which is a soft part, covers the flow path forming cylinder 157, the inner surface of the balloon 110 is less likely to be pressed against the hard part, making it less likely that the inner surface of the balloon 110 will be damaged. Note that the soft part is not limited to the tube 158 fitted onto the outer surface of the flow path forming cylinder 157, but may be formed by fixing an elastic body to the outer surface of the flow path forming cylinder 157 by integral molding or the like. Alternatively, the soft part may be formed by fitting an elastic body into the inside of the flow path forming cylinder 157 and fixing it thereto.

[0026] In this embodiment, the tube 158 covers the entire flow path forming cylinder 157. This prevents the rigid flow path forming cylinder 157 from coming into contact with the inner surface of the balloon 110, making it less likely to be damaged. However, the tube 158 may also cover only a portion of the flow path forming cylinder 157. While there are no particular limitations on the portion that the tube 158 covers, when the reservoir container 100 is lifted by grasping the base member 130, a greater force is applied to the bottom end of the flow path forming cylinder 157 that is farther from the base member 130 due to the principle of leverage. Even if the bottom end of the flow path forming cylinder 157 is not covered by the tube 158, the outer diameter of the tube can be increased to allow the balloon and the tube to come into contact, making it less likely to damage the balloon 110. However, because increasing the outer diameter of the tube 158 reduces flexibility, it is preferable that the bottom end of the flow path forming cylinder 157 be covered by the tube 158.

[0027] In this embodiment, the tube 158 has an extension 158a that extends beyond the bottom end of the flow path forming cylinder 157 toward the bottom of the balloon 110 and is positioned below the flow path forming cylinder 157, thereby extending the axial length of the components within the balloon. By providing the extension 158a, the flow path forming cylinder 157 is not present within the end of the tube 158, making it less likely that the inner surface of the balloon 110 will be damaged. The longer the length of the tube 158, the less likely stress will concentrate at the contact point between the inner surface of the balloon 110 and the bottom end of the flow path forming cylinder 157. Therefore, from the perspective of further reducing stress concentration, it is preferable that the length of the tube 158, including the extension 158a, be at least twice the length of the flow path forming cylinder 157. Note that the extension 158a may be provided as needed, and the tube 158 may also be configured not to extend beyond the bottom end of the flow path forming cylinder 157 toward the bottom of the balloon 110. The extension portion 158a may be formed by fitting an elastic body inside the flow path forming cylinder 157, in which case it is possible to prevent the existence of a soft portion on the outer surface of the flow path forming cylinder 157.

[0028] In this embodiment, the extension 158a has a portion that is located below the axial center of the inflated portion of the balloon 110 in the drawing, and extends to near the bottom of the balloon 110. The position of the bottom end of the extension 158a can be set as appropriate, but in this embodiment, liquid is introduced into the balloon 110 from the side wall opening 154 of the balloon fixing part 135, so by extending the tube 158 that serves as the outflow flow path to near the bottom of the balloon 110, it is possible to obtain the advantage that air bubbles can be easily removed during priming.

[0029] Priming, which fills the balloon 110 with liquid and pushes out any air bubbles, involves inserting a syringe into the inlet port 131, turning the reservoir container 100 upside down, and pressing the plunger end of the syringe against a desk or the like to inject the liquid. The liquid injected from the inlet port 131 flows into the balloon 110 via the first internal flow path 137 provided in the base member 130 and the lumen 133a and side wall opening 154 provided in the inner cylinder 133. The liquid inside the balloon 110 enters the extension portion 158a of the tube 158, which is a soft portion, from the end opening 160, and flows in this order through the flow path forming cylinder 157, the inner cylinder 156, the second internal flow path 138, and the tube 191 connected to the outlet port 132.

[0030] The positional relationship between the first opening that guides liquid from inside the balloon 110 toward the outlet port 132 and the second opening that guides liquid from the inlet port 131 into the balloon 110 is not particularly limited. However, in order to effectively push out air bubbles from the space between the balloon fixing part 135 and the balloon 110 during priming, it is preferable that the first opening through which liquid flows out of the balloon 110 be located closer to the bottom of the balloon 110 than the second opening that introduces liquid into the balloon 110. In this embodiment, the end opening 160 of the extension part 158a of the soft part is the first opening, and is located closer to the bottom of the balloon 110 than the side wall opening 154 of the intermediate part 153, which is the second opening. Note that if the soft part does not have the extension part 158a, the end opening of the flow path forming cylinder 157, rather than the soft part, may be the first opening. The side hole can be used as the first opening together with or instead of the end opening by providing a side hole in the extension portion 158a, or by providing a side hole in the soft portion and the corresponding portion of the flow path forming cylinder.

[0031] The second opening is not limited to the sidewall opening 154 provided in the intermediate portion 153, and various other configurations can be employed. For example, at least a portion of the flow path communicating with the inlet port 131 can be formed independently of the inner tube 133, and an opening of the flow path can be provided in the inflated portion of the balloon 110 to serve as the second opening. The location of the second opening is not particularly limited, but from the viewpoint of facilitating the removal of air bubbles during priming, it is preferable that the second opening be located as close to the mouth of the inflated portion of the balloon 110 as possible, preferably closer to the mouth of the balloon 110 than the first opening and closer to the mouth than one-third of the inflated portion, and more preferably closer to the mouth than one-fifth of the inflated portion.

[0032] In this embodiment, the soft portion is a tube 158 that covers at least a portion of the flow path forming cylinder 157. In this configuration, the soft portion can be easily provided by fitting the tube 158 to the outside of the flow path forming cylinder 157. In this embodiment, a retainer 159 that expands in diameter once and then contracts again is provided on the outer surface of the flow path forming cylinder 157, so that the tube 158 can be securely fitted to the outside. However, the retainer is not limited to this configuration, and the flow path forming cylinder 157 may be fixed by press-fitting without providing a retainer, or the tube may be fixed by providing an exterior member that sandwiches the tube between the flow path forming cylinder and the retainer.

[0033] The soft portion can be formed by fitting various soft materials, not limited to a tube, onto the flow path forming cylinder 157. Furthermore, it can be formed by various methods, not limited to the method of fitting onto the flow path forming cylinder 157. For example, by integrally molding a hard member and a soft member by two-color molding or the like, a configuration can be achieved in which the protrusion and the soft portion are integrally formed.

[0034] The soft portion can be made of a material softer than the flow path forming cylinder 157. For example, the flow path forming cylinder 157 can be made of hard vinyl chloride, acrylic resin, polyolefin resin, polycarbonate resin, acrylic-butadiene-styrene (ABS) resin, etc. The soft portion can be made of soft vinyl chloride, silicone, various rubbers, elastomers, etc.

[0035] In this embodiment, the balloon 110 is cylindrical with a bottom, as shown in FIG. 3 , and has a cylindrical portion 111 formed by a sidewall extending from an opening 112 to a bottom 113. The cylindrical portion 111 is formed to have a substantially constant thickness from the opening 112 to the bottom 113. The opening 112 side of the cylindrical portion 111 forms a fixed portion 115 that is fixed to the balloon fixing portion 135. The fixed portion 115 is sandwiched and pressed and fixed between a base 151 and an outer tube 152 of the inner tube 133. The portion of the cylindrical portion 111 excluding the fixed portion 115 forms an expanding portion 116 that expands when liquid is injected. The bottom portion 113 is a region that includes not only the bottom surface but also a curved, thick portion.

[0036] The balloon 110 shown in FIG. 3 has the advantage of being simple and easy to mold. However, if the crosslink density of the balloon 110 shown in FIG. 3 is uneven, the lower crosslink density portion will expand first and contract later. Due to the characteristics of the manufacturing process, the crosslink density of the balloon 110 tends to be lower on the bottom 113 side. Therefore, when liquid is injected into the balloon 110, the bottom 113 side expands before the mouth 112 side, and when the liquid flows out, the mouth 112 side contracts before the bottom 113 side. If the bottom 113 side of the balloon 110 is inflated, even if the mouth 112 side contracts, the expanded portion on the bottom 113 side will get in the way, preventing the soft shell 120 from contracting. Therefore, even if the amount of liquid in the balloon 110 is low, the overall volume of the reservoir container remains large. For this reason, a balloon that expands at the mouth 112 side before the bottom 113 side when liquid is injected and gradually deflates from the bottom 113 side when liquid flows out is preferred from the viewpoint of convenience.

[0037] 4, the inner wall surface of the balloon 110A is inclined so that the inner diameter φ2 on the bottom 113 side of the tubular portion 111 is larger than the inner diameter φ1 on the mouth 112 side. Therefore, the wall thickness t2 on the bottom 113 side of the tubular portion 111 is thicker than the wall thickness t1 on the mouth 112 side, making the mouth 112 side a thin-walled tubular portion and the bottom 113 side a thick-walled tubular portion.

[0038] 5A shows a state in which 50 mL of water has been poured into a balloon having a mouth portion 112 with an inner diameter φ1 of 11 mm and a thickness t1 of 2 mm, a bottom portion 113 with an inner diameter φ2 of 10 mm and a thickness t1 of 2.5 mm, a tubular portion 111 with a length of 98 mm, and a thick-walled tubular portion on the bottom 113 side. The mouth portion 112 side fixed to the balloon fixing portion 135 is inflated, and the bottom 113 side is not inflated.

[0039] 5B shows a state in which 50 mL of water has been poured into a balloon with a constant wall thickness, in which the inner diameter φ1 at the mouth 112 and the bottom 113 is 11 mm, the thickness t1 is 2 mm, and the length of the tubular portion 111 is 112 mm. The mouth 112 side fixed to the balloon fixing part 135 is not inflated, and the bottom 113 side is inflated.

[0040] FIG. 5C shows the state in which 500 mL of water has been poured into a balloon having a thick-walled cylindrical portion on the bottom 113 side. It is clear that the balloon gradually expands from the initially expanded portion toward the bottom 113 side. When the liquid inside the balloon is drained from this state, it gradually contracts from the bottom 113 side, returning to approximately its initial state via the state shown in FIG. 5A. In this way, by providing a thick-walled cylindrical portion on the bottom 113 side that is thicker than the mouth 112 side, it is possible to create a balloon that gradually expands from the mouth 112 side and gradually contracts from the bottom 113 side.

[0041] In Figure 4, a configuration is shown in which the outer diameter of the cylindrical portion 111 is constant and the inner diameter is reduced to increase the wall thickness, but it is also possible to increase the outer diameter and keep the inner diameter constant, or to change both the outer diameter and the inner diameter.

[0042] FIG. 4 shows a configuration in which the wall thickness of the entire tubular portion 111 gradually increases from the opening 112 side toward the bottom 113 side. This configuration is easy to form. The fixed portion 115, which is clamped and fixed to the balloon fixing portion 135, does not expand due to the injection of liquid. Therefore, the fixed portion 115 may have a constant wall thickness, and the expansion portion 116 of the tubular portion 111 excluding the fixed portion 115 may have a wall thickness that gradually increases from the opening 112 side toward the bottom 113 side. The change in wall thickness does not have to be uniform throughout the entire expansion portion 116. For example, the wall thickness may change only in a portion of the expansion portion 116, while the other portions may have a constant wall thickness.

[0043] The balloon 110B shown in FIG. 6 has a cylindrical portion 111 with a gradually decreasing inner diameter and an expanding portion 117 in the expanding portion 116 where the outer diameter gradually increases. The outer diameter of the expanding portion 116 is constant except for the expanding portion 117. This configuration allows for more precise control of the position where the balloon begins to expand. From the viewpoint of having the balloon expand from the opening side, the position where the expansion of the outer diameter begins is preferably closer to the opening 112 than to the axial center of the expanding portion 116. Note that the expansion of the outer diameter can also begin from the fixed portion 115. The outer diameter can also be expanded up to the bottom 113, but from the viewpoint of formability, it is preferable to provide a region with a constant outer diameter on the bottom 113 side.

[0044] As a method for forming a thin-walled cylindrical portion on the mouth 112 side and a thick-walled cylindrical portion on the bottom 113 side, a configuration in which at least one of the inner and outer wall surfaces of the cylindrical portion 111 is inclined to vary the wall thickness has been shown, but a configuration in which the wall thickness varies by a step may also be used. However, from the viewpoint of not interfering with the flow of liquid inside the balloon, a configuration without steps on the inner wall surface is preferred.

[0045] Balloons with an easily inflatable mouth portion 112, such as balloon 110A shown in FIG. 4 and balloon 110B shown in FIG. 5, can be combined with base members and soft shells of various configurations to form reservoir containers. For example, they can be combined with the base member and soft shell of the configuration shown in FIG. 2, in which a soft portion is provided on a protruding portion extending into the inflation portion of the balloon. They can also be combined with base members that do not have a soft portion on a protruding portion or that do not have a protruding portion. Regardless of the configuration of the base member combined, balloons with an easily inflatable mouth portion deflate from the bottom side as liquid is discharged. This allows the soft shell to smoothly deflate as the liquid volume decreases, improving convenience.

[0046] In the reservoir container 100 of this embodiment, the base member 130 has a peripheral wall portion 186 that stands from the surface opposite the balloon fixing portion 135, and a soft shell fixing portion 187 is attached to surround the peripheral wall portion 186. The mouth of the soft shell 120 is sandwiched between the peripheral wall portion 186 and the soft shell fixing portion 187. With this configuration, the base member 130 and the soft shell 120 can be easily fixed together.

[0047] In this embodiment, the soft shell fixing portion 187 is formed into a cylindrical shape by wrapping a thin plate around the peripheral wall portion 186 and physically fixing it with a locking mechanism using fitting claws. With this configuration, the soft shell 120 can be easily clamped and fixed to the peripheral wall portion. Welding or adhesive bonding can also be used instead of a physical locking mechanism. Also, a member previously formed into a cylindrical shape can be fitted.

[0048] In this embodiment, cap 181 is connected to soft shell fixing portion 187 via hinge 184. Cap 181 has male plug 183 that is inserted into inlet port 131, which is a female connector, and a tubular portion 182 that surrounds male plug 183. With this configuration, the cap does not separate from the reservoir container, and therefore the cap will not be dropped or lost, improving convenience.

[0049] In this embodiment, hinge 184 is a spring hinge, and when cap 181 is removed from inlet port 131, it is urged to a position where the axes are approximately parallel to soft shell fixing portion 187 attached to peripheral wall portion 186, as shown in Fig. 2. For this reason, the removed cap 181 is less likely to get in the way when connecting a syringe or the like to the inlet port.

[0050] The configuration for fixing the base member 130 and the soft shell 120 is not limited to this configuration and various other configurations can be used. The configuration of the cap 181 that closes the inlet port 131 is also not limited to this configuration and various other configurations can be used.

[0051] In the reservoir container of this embodiment, a circuit for delivering the fluid to a patient is connected to the outlet port 132. There are no particular limitations on the circuit connected to the outlet port 132, but for example, in the circuit shown in Fig. 1, a bubble removal filter 194 and a needleless port 195 are connected to a connector 193 via tubes 191 and 192. A clamp 196 for closing the tube 191 is attached between the outlet port 132 and the bubble removal filter 194. The circuit configuration can be changed appropriately as necessary.

[0052] The reservoir container of this embodiment is not particularly limited, but can be made large, with a capacity of 500 mL or more, and is suitable for storing physiological saline. However, it is also useful for smaller volumes, and the liquid stored in the reservoir container can also be a medicinal liquid. [Industrial Applicability]

[0053] The reservoir container of the present disclosure can solve at least one of the problems that arise in a reservoir container in which a balloon is housed in a soft shell, and is useful in medical applications and the like. [Explanation of symbols]

[0054] 100 reservoir container 110 Balloon 110A Balloon 110B Balloon 111 Cylindrical part 112 Mouth 113 Bottom 115 Fixed part 116 Expansion part 117 Expanded diameter part 120 Soft Shell 130 Base member 131 Inlet Port 132 Exit Port 133 Inner tube 133a lumen 135 Balloon fixing part 137 First internal flow channel 138 Second internal flow channel 151 Base 152 Outer tube 153 Middle section 154 Side wall opening 156 Internal tube 157 Flow path forming tube 158 tubes 158a Extension 159 Stopper 160 End opening 181 Cap 182 Cylinder part 183 male plug 184 Hinge 186 Peripheral wall section 187 Soft shell fixing part 191 tubes 193 Connector 194 Air bubble removal filter 195 Needleless Sport 196 Clamp

Claims

1. a cylindrical balloon with a bottom that expands when a liquid is injected into it; a soft shell that houses the balloon; an inlet port for allowing the inflow of liquid; an outlet port for the outflow of liquid; a flow path forming cylinder that forms a flow path between the inlet port and the outlet port within the balloon, A reservoir container, wherein a soft portion that is softer than the flow path forming cylinder is provided on the bottom side of the balloon of the flow path forming cylinder.

2. The reservoir container according to claim 1 , wherein the soft portion has an extension portion located closer to the bottom of the balloon than the flow path forming cylinder.

3. the soft portion has a first opening that communicates with the flow path forming cylinder and guides the liquid inside the balloon to the outlet port side; The reservoir container according to claim 1 , further comprising a second opening for guiding liquid from the inlet port into the interior of the balloon, the second opening being located closer to the mouth of the balloon than the first opening.

4. The reservoir container according to any one of claims 1 to 3, wherein the expansion portion of the balloon has a thin-walled cylindrical portion and a thick-walled cylindrical portion that is located closer to the bottom than the thin-walled cylindrical portion and is thicker than the thin-walled cylindrical portion, and deflates from the bottom side when liquid is discharged.

5. a cylindrical balloon with a bottom that expands when a liquid is injected into it; a soft shell that houses the balloon; an inlet port for allowing the inflow of liquid; an outlet port for the outflow of the liquid; a flow path forming cylinder that forms a flow path between the inlet port and the outlet port within the balloon, The expansion portion of the balloon has a thin-walled cylindrical portion and a thick-walled cylindrical portion that is located closer to the bottom than the thin-walled cylindrical portion and is thicker than the thin-walled cylindrical portion, and the reservoir container deflates from the bottom side when liquid is discharged.

6. The reservoir container according to claim 5, wherein the inflation portion of the balloon is formed such that the outer diameter of the side wall increases toward the bottom side in at least a portion thereof, and the thickness of the side wall gradually increases toward the bottom side.

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