Dialysis cassette

Abstract

To provide a dialysis cassette whose storage space necessary after use to disposal of the dialysis cassette is small.SOLUTION: A dialysis cassette includes a cassette body 16, a pump part 20 that feeds dialysate, and a heating part 26 that heats the dialysate. The cassette body 16 includes: a first segment provided with the pump part 20; a second segment provided with the heating part 26; and a bent part 63 provided between the first segment and the second segment. The cassette body 16 can be folded by the bent part 63 such that the first segment and the second segment overlap the cassette body 16 in a thickness direction.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a dialysis cassette used in an automated peritoneal dialysis system.

Background Art

[0002] For example, an automated peritoneal dialysis system is known as shown in Patent Document 1. The automated peritoneal dialysis system has a function of automatically feeding (injecting) dialysis fluid into the abdominal cavity of a user (patient) and feeding (draining) dialysis fluid from the abdominal cavity of the user to a drainage bag. The automated peritoneal dialysis system includes a device main body having a housing and a dialysis cassette that is detachably attached to a slot provided in the device main body. The dialysis cassette is a fluid circuit member having a pump function and a valve function. Through the dialysis cassette attached to the device main body, dialysis fluid is fed (injected) from a dialysis fluid bag into the abdominal cavity of the user, and dialysis fluid is transferred (drained) from the abdominal cavity of the user to the drainage bag.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The dialysis cassette is a disposable product that is discarded after one use. Therefore, it is desirable to reduce the storage space for the dialysis cassette from after use until it is discarded.

[0005] An object of the present invention is to solve the above-described problems.

Means for Solving the Problems

[0006] (1) One aspect of the present invention is a dialysis cassette having a liquid delivery channel for flowing dialysis fluid, a pump unit provided in the cassette body for delivering the dialysis fluid, and a heating unit provided in the cassette body for heating the dialysis fluid, and is a dialysis cassette detachable from a dialysis apparatus main body, wherein the cassette body has a first segment provided with the pump unit, a second segment adjacent to the first segment and provided with the heating unit, and a bent portion provided between the first segment and the second segment, and the cassette body is foldable by the bent portion such that the first segment and the second segment overlap in the thickness direction of the cassette body.

[0007] According to the dialysis cassette configured as described above, since the dialysis cassette can be folded after use, the size of the dialysis cassette can be reduced. Thereby, the storage space for the dialysis cassette from after use until disposal can be reduced.

[0008] (2) In the dialysis cassette according to (1) above, a notch groove having a groove depth in the thickness direction is provided between the first segment and the second segment such that a thin portion having a thickness smaller than that of the first segment and the second segment in the thickness direction is formed as the bent portion, and when a load equal to or greater than a predetermined value acts on the cassette body, the thin portion may be deformed so that the thin portion is bent.

[0009] With this configuration, since the thin portion functions as the bent portion, the bent portion can be formed with a simple configuration.

[0010] (3) In the dialysis cassette according to (2) above, in the thickness direction, the thickness of the second segment may be smaller than the thickness of the first segment.

[0011] With this configuration, since the groove depth of the notch groove becomes smaller, the thin portion can be easily formed.

[0012] (4) In the dialysis cassette according to (3) above, a part of the liquid supply channel is formed inside the bent portion, and between the first segment and the second segment, a covering member is disposed to cover at least the portion of the thin-walled portion where the liquid supply channel is formed. The covering member may suppress leakage of liquid from the bent portion when the cassette body is folded.

[0013] With this configuration, leakage of liquid (dialysate) from the bent portion when the cassette body is folded can be prevented or suppressed.

[0014] (5) In the dialysis cassette according to (4) above, the covering member may be an elastic sheet.

[0015] With this configuration, leakage of liquid from the bent portion can be prevented or suppressed even better.

[0016] (6) In the dialysis cassette according to (1) above, the bent portion may be a hinge portion that rotatably connects the first segment and the second segment to each other.

[0017] With this configuration, by folding the cassette body in the initial state, the size of the dialysis cassette in the initial state can be made compact.

[0018] (7) In the dialysis cassette according to any one of (1) to (6) above, the first segment has a first end portion adjacent to the bent portion and a second end portion opposite to the first end portion, and a plurality of liquid supply tubes may be connected to the second end portion.

[0019] With this configuration, since the liquid supply tubes are connected to the side opposite to the bent portion, a plurality of liquid supply tubes can be wound around the folded cassette body so that the plurality of liquid supply tubes partially face the bent portion. By winding the liquid supply tubes around the folded cassette body, the folded state of the cassette body can be easily maintained.

[0020] (8) In the dialysis cassette according to any one of (1) to (7) above, a connecting and holding portion capable of connecting the first segment and the second segment may be provided on one or both of the first segment and the second segment to hold the folded state of the cassette body.

[0021] With this configuration, the folded state of the dialysis cassette can be easily maintained.

Advantages of the Invention

[0022] According to the dialysis cassette of the present invention, since the dialysis cassette can be folded after use, the size of the dialysis cassette can be reduced. As a result, the storage space for the dialysis cassette from after use until disposal can be reduced.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0024] The automatic peritoneal dialysis system 10 shown in FIG. 1 includes a dialysis device main body 12 and a dialysis cassette 14. The dialysis device main body 12 includes a cassette mounting portion 120. The cassette mounting portion 120 has a slot 122 capable of accommodating the dialysis cassette 14 and a lid member 124 capable of opening and closing the opening 123 of the slot 122. On the front surface of the dialysis device main body 12, a start button 125 for instructing the start of the operation of the device and a stop button 126 for instructing the stop of the operation of the device are provided. On the front surface of the dialysis device main body 12, a touch panel 128 that functions as a display unit and an input unit is further provided. The user can input various setting information via the touch panel 128.

[0025] Although not shown, as will be described later, the dialysis device main body 12 further includes a pump driving unit that operates the pump unit 20 of the dialysis cassette 14, a valve driving unit that operates the valve unit 24 of the dialysis cassette 14, and a heating mechanism that heats the heating unit 26 of the dialysis cassette 14.

[0026] The dialysis cassette 14 includes a cassette main body 16 that is detachable from the slot 122 of the dialysis device main body 12 and a plurality of liquid supply tubes 18 connected to the cassette main body 16.

[0027] As shown in FIG. 2, the cassette main body 16 has a liquid supply channel 19 (fluid circuit) for flowing the dialysate (see also FIG. 3). The cassette main body 16 is provided with a pump unit 20 for feeding the dialysate, a plurality of valve units 24 that can be opened and closed, and a heating unit 26 for heating the dialysate. The cassette main body 16 has a plate-shaped base member 28 and a plurality of flexible sheets 30 fixed to the base member 28. The base member 28 is made of a resin material. Examples of the resin material constituting the base member 28 include hard resins such as polypropylene, polyethylene, and polycarbonate. Hereinafter, regarding the base member 28, the side facing upward in FIG. 2 is referred to as the "front side", and the side facing downward in FIG. 2 is referred to as the "back side".

[0028] As shown in FIG. 3, the pump unit 20 is provided on the front side of the base member 28. In the present embodiment, two pump units 20 are provided. Only one pump unit 20 may be provided, or three or more pump units 20 may be provided.

[0029] A plurality of valve units 24 are provided on the front side of the base member 28. Each valve unit 24 has a valve chamber 241 that is recessed from the front side to the back side of the base member 28 and a valve port 242 provided in the valve chamber 241. A groove-shaped main flow path 36 is provided on the back side of the base member 28. The main flow path 36 is a part of the liquid supply channel 19. The main flow path 36 is composed of a plurality of flow paths formed so as to surround the pump unit 20. The plurality of valve chambers 241 provided on the front side of the base member 28 communicate with the main flow path 36 provided on the back side of the base member 28 through a plurality of communication holes 280 that penetrate the base member 28 in the thickness direction (T direction).

[0030] The heating unit 26 has a first heating flow path 261 and a second heating flow path 262. The first heating flow path 261 constitutes a part of the liquid supply channel 19. The second heating flow path 262 constitutes another part of the liquid supply channel 19. The first heating flow path 261 is groove-shaped and provided on the back side of the base member 28. The second heating flow path 262 is groove-shaped and provided on the front side of the base member 28.

[0031] The base member 28 has a first part 281, a second part 282, and an intermediate part 283. The pump part 20 and the valve part 24 are provided on the front surface side of the first part 281. The main flow path 36 is provided on the back surface side of the first part 281 and the back surface side of the intermediate part 283. The first heating flow path 261 is provided on the back surface side of the second part 282. The second heating flow path 262 is provided on the front surface side of the second part 282. The first heating flow path 261 and the second heating flow path 262 communicate with each other through a through hole 285 penetrating in the thickness direction of the base member 28.

[0032] Hereinafter, regarding the cassette main body 16 and its components, a direction (W direction) orthogonal to the arrangement direction of the first part 281 and the second part 282 and orthogonal to the thickness direction of the base member 28 is referred to as the "width direction".

[0033] As shown in FIG. 2, the thickness of the second part 282 is smaller than the thickness of the first part 281. The intermediate part 283 is smaller than the thickness of the second part 282. A part of the liquid feeding flow path 19 is provided in the intermediate part 283. A notch groove 38 extending in the width direction of the cassette main body 16 is formed between the first part 281 and the second part 282. Therefore, the cassette main body 16 has the notch groove 38.

[0034] As shown in FIG. 3, a plurality of connection ports 40 are provided on the base member 28. A plurality of liquid feeding tubes 18 are respectively connected to the plurality of connection ports 40. The plurality of connection ports 40 are provided on one side edge part 28s in the width direction of the base member 28. The plurality of connection ports 40 protrude in the width direction from the side edge part 28s. The plurality of connection ports 40 have a plurality of liquid injection ports 41, one user-side port 42, and one drainage port 43.

[0035] The plurality of liquid delivery tubes 18 includes an injection tube 46 (injection line), a user-side tube 48 (peritoneal line), and a drainage tube 50 (drainage line). The plurality of injection ports 41 are connected to the plurality of dialysis fluid bags 52 via the injection tube 46 having a plurality of branch lines. The user-side port 42 is connected to the user's abdomen via the user-side tube 48. The drainage port 43 is connected to the drainage tank 54 via the drainage tube 50. Note that only one injection port 41 may be provided.

[0036] As shown in FIG. 2, the plurality of flexible sheets 30 include a first sheet 31, a second sheet 32, and a third sheet 33. The first sheet 31, the second sheet 32, and the third sheet 33 are liquid-tightly attached to the base member 28. Specifically, the first sheet 31 and the second sheet 32 are disposed on the front surface side of the base member 28. The third sheet 33 is disposed on the back surface side of the base member 28. As shown in FIG. 3, the first sheet 31 covers the pump chamber 21 and the valve chamber 241 so that the pump unit 20 can be operated and each valve port 242 can be opened and closed. The second sheet 32 covers the second heating flow path 262 of the heating unit 26. The third sheet 33 covers the main flow path 36 and the first heating flow path 261.

[0037] As shown in FIG. 1, the dialysis cassette 14 includes a first segment 61, a second segment 62, and a bent portion 63. The first segment 61 is composed of the first portion 281 of the base member 28, the first sheet 31, and a part of the third sheet 33. The second segment 62 is composed of the second portion 282 of the base member 28, the second sheet 32, and another part of the third sheet 33. The thickness of the second segment 62 is smaller than the thickness of the first segment 61.

[0038] The first segment 61 and the second segment 62 are adjacent to each other via a bent portion 63. The bent portion 63 is disposed between the first segment 61 and the second segment 62. The cassette body 16 can be folded by the bent portion 63 such that the first segment 61 and the second segment 62 overlap in the thickness direction of the cassette body 16. The intermediate portion 283 of the base member 28 constitutes the bent portion 63. The bent portion 63 is a thin portion 64 having a smaller thickness than the first segment 61 and the second segment 62.

[0039] As shown in FIG. 4, a notch groove 38 is formed between the first segment 61 and the second segment 62. The notch groove 38 has a groove depth in the thickness direction of the cassette body 16. By providing the notch groove 38, the thin portion 64 is formed. That is, the thin portion 64 is formed adjacent to the notch groove 38. As shown in FIG. 2, both ends in the extending direction of the notch groove 38 open at both end faces in the width direction (W direction) of the cassette body 16 (base member 28). Therefore, the notch groove 38 and the thin portion 64 (bent portion 63) extend across the entire width of the cassette body 16.

[0040] The bent portion 63 is provided with a first flow path element 71 that transfers the dialysate from the first segment 61 toward the second segment 62, and a second flow path element 72 that transfers the dialysate from the second segment 62 toward the first segment 61. The first flow path element 71 is a part of the liquid supply flow path 19 (a part of the main flow path 36). The second flow path element 72 is another part of the liquid supply flow path 19 (another part of the main flow path 36).

[0041] As shown in FIGS. 3 and 4, between the first segment 61 and the second segment 62, a covering member 66 that covers at least the portion of the bent portion 63 (thin portion 64) where the liquid supply flow path 19 is formed is disposed. The covering member 66 is fixed to the bent portion 63. The covering member 66 suppresses leakage of liquid from the bent portion 63 when the cassette body 16 is folded.

[0042] The covering member 66 is, for example, a stretchable sheet 67 having liquid impermeability. The covering member 66 is, for example, a rubber sheet (elastomer sheet). As shown in FIG. 3, the length (dimension in the W direction) of the covering member 66 may be shorter than the full width of the cassette body 16. In other embodiments, the length of the covering member 66 may be equal to the full width of the cassette body 16.

[0043] Although not shown in detail, the pump driving unit provided in the dialysis apparatus main body 12 can pull or press a portion of the first sheet 31 corresponding to the pump unit 20 (hereinafter referred to as the "pump region"). The pump driving unit can, for example, draw dialysis fluid into the pump unit 20 by applying a negative pressure to the pump region of the first sheet 31 and pulling the pump region in a direction away from the base member 28. The pump driving unit can discharge dialysis fluid from the pump unit 20 by applying a positive pressure to the pump region of the first sheet 31 and pushing the pump region toward the base member 28.

[0044] The valve driving unit provided in the dialysis apparatus main body 12 has a plurality of pressing portions for closing the plurality of valve portions 24. The plurality of pressing portions can press each portion of the first sheet 31 facing the plurality of valve ports 242 toward the plurality of valve ports 242, respectively. The valve driving unit can selectively close the plurality of valve portions 24 (valve ports 242). The pump driving unit can switch the liquid supply path by selecting the open / closed states of the plurality of valve portions 24 by the plurality of pressing portions.

[0045] The heating mechanism provided in the dialysis apparatus main body 12 has a first heater and a second heater facing each other. With the cassette body 16 inserted (mounted) in the slot 122, the first heater faces the first heating flow path 261, and the second heater faces the second heating flow path 262. The heating mechanism heats the dialysis fluid flowing through the first heating flow path 261 and the second heating flow path 262 by the first heater and the second heater.

[0046] The automated peritoneal dialysis system 10 is used as follows.

[0047] In FIG. 1, the dialysis cassette 14 is inserted into the slot 122 of the dialysis apparatus main body 12, and the lid member 124 is closed. When the user presses the start button 125, the automated peritoneal dialysis system 10 starts its operation (fluid delivery process). The fluid delivery process performed by the automated peritoneal dialysis system 10 mainly includes a fluid injection process and a fluid drainage process. With reference to FIG. 3, the fluid injection process and the fluid drainage process will be described.

[0048] The fluid injection process is a process of sending dialysis fluid from the dialysis fluid bag 52 into the user's abdominal cavity through the dialysis cassette 14. Specifically, the fluid injection process includes a process of drawing the dialysis fluid from the dialysis fluid bag 52 into the pump chamber 21 (the first step of the fluid injection process) and a process of sending the dialysis fluid from the pump chamber 21 into the user's abdominal cavity (the second step of the fluid injection process).

[0049] In the first step of the fluid injection process, the dialysis apparatus main body 12 selects the opening and closing states of the plurality of valve chambers 241 so as to secure the flow path between the dialysis fluid bag 52 and the pump chamber 21, and pulls the pump region of the first sheet 31 in a direction away from the base member 28. Thereby, the dialysis fluid is drawn into the pump chamber 21, and the dialysis fluid is temporarily stored in the pump chamber 21.

[0050] In the second step of the fluid injection process, the dialysis apparatus main body 12 selects the opening and closing states of the plurality of valve parts 24 so as to secure the flow path between the pump chamber 21 and the user's abdominal cavity through the heating part 26 (the first heating flow path 261 and the second heating flow path 262), and pushes the pump region of the first sheet 31 toward the base member 28. Thereby, the dialysis fluid is pushed out from the pump chamber 21, heated by the heating part 26, and then sent into the user's abdominal cavity.

[0051] The drainage process is a process of sending the used dialysis fluid from the user's abdominal cavity to the drainage tank 54 through the dialysis cassette 14. Specifically, the drainage process includes a step of drawing the dialysis fluid from the user's abdominal cavity into the pump chamber 21 (the first step of the drainage process) and a step of sending the dialysis fluid from the pump chamber 21 to the drainage tank 54 (the second step of the drainage process).

[0052] In the first step of the drainage process, the dialysis device main body 12 selects the opening and closing states of the plurality of valve chambers 241 so that the flow path between the user's abdominal cavity and the pump chamber 21 is secured, and pulls the pump region of the first sheet 31 in a direction away from the base member 28. As a result, the dialysis fluid is drawn into the pump chamber 21, and the dialysis fluid is temporarily stored in the pump chamber 21.

[0053] In the second step of the drainage process, the dialysis device main body 12 selects the opening and closing states of the plurality of valve chambers 241 so that the flow path between the pump chamber 21 and the drainage tank 54 is secured, and pushes the pump region of the first sheet 31 toward the base member 28. As a result, the dialysis fluid is pushed out from the pump chamber 21 and sent to the drainage tank 54.

[0054] After the discharge of the dialysis fluid to the drainage tank 54 is completed, the dialysis cassette 14 (cassette main body 16) is removed from the dialysis device main body 12. The dialysis cassette 14 is a disposable product that is discarded after one use. Prior to the disposal of the dialysis cassette 14, as shown in FIG. 5, the user can fold the cassette main body 16 so that the first segment 61 and the second segment 62 overlap each other. Specifically, the user applies a force to bend the cassette main body 16. Since the thin portion 64 has a lower strength due to its smaller thickness compared to the first segment 61 and the second segment 62, stress concentrates on the thin portion 64 when a bending force acts on the cassette main body 16. For this reason, when a load exceeding a predetermined value acts on the cassette main body 16, the thin portion 64, which is the bent portion 63, deforms (plastic deformation, partial fracture), causing the thin portion 64 to bend.

[0055] The user temporarily stores the dialysis cassette 14 with the cassette body 16 folded in a storage space and discards the dialysis cassette 14 after storage.

[0056] This embodiment has the following effects.

[0057] According to the dialysis cassette 14, since the dialysis cassette 14 can be folded after use, the size of the dialysis cassette 14 can be reduced. As a result, the dialysis cassette 14 does not take up much space, and the storage space for the dialysis cassette 14 from after use until disposal can be reduced.

[0058] As shown in FIG. 4, a notch groove 38 is provided between the first segment 61 and the second segment 62 such that a thin portion 64 having a thickness smaller than that of the first segment 61 and the second segment 62 is formed as a bending portion 63 in the thickness direction of the cassette body 16. When a load equal to or greater than a predetermined value acts on the cassette body 16, the thin portion 64 deforms and the thin portion 64 bends. Since the thin portion 64 functions as the bending portion 63 in this way, the bending portion 63 can be formed with a simple configuration.

[0059] In the thickness direction of the cassette body 16, the thickness of the second segment 62 is smaller than the thickness of the first segment 61. Since the groove depth of the notch groove 38 is small, the thin portion 64 can be easily formed.

[0060] A covering member 66 that covers at least a portion of the thin portion 64 in which the liquid supply channel 19 is formed is disposed between the first segment 61 and the second segment 62. Thereby, even when a part of the bending portion 63 is broken when the cassette body 16 is folded, the covering member 66 can suppress or prevent leakage of liquid (dialysate) from the bending portion 63. When the covering member 66 is an elastic sheet 67, leakage of liquid from the bending portion 63 can be more effectively prevented or suppressed.

[0061] In the automatic peritoneal dialysis system 10, any one of the first to fourth modified examples described below may be adopted instead of the dialysis cassette 14 described above.

[0062] The cassette main body 16A of the dialysis cassette 14A according to the first modified example shown in FIG. 6 has a bent portion 63A. The bent portion 63A is a perforation 74 provided between the first segment 61 and the second segment 62 and extending in the width direction of the cassette main body 16A. Specifically, the perforation 74 is composed of a plurality of slit holes 741 penetrating the cassette main body 16 in the thickness direction and a plurality of non-slit portions 742 formed between the plurality of slit holes 741. The slit holes 741 are provided at positions (non-slit portions 742) avoiding the first flow path element 71 and the second flow path element 72.

[0063] By providing the perforation 74 between the first segment 61 and the second segment 62 of the cassette main body 16, the portion between the first segment 61 and the second segment 62 becomes relatively fragile (low strength) compared to the first segment 61 and the second segment 62. Therefore, the portion between the first segment 61 and the second segment 62 can function as the bent portion 63A. For this reason, the user can fold the cassette main body 16A so that the first segment 61 and the second segment 62 overlap each other.

[0064] The cassette main body 16B of the dialysis cassette 14B according to the second modified example shown in FIG. 7 has a bent portion 63B. The bent portion 63B is a hinge portion 76 that rotatably connects the first segment 61 and the second segment 62 to each other. The first segment 61 and the second segment 62 are rotatable with respect to each other about a rotation axis along the width direction of the cassette main body 16B. For this reason, as shown by the phantom line in FIG. 7, the user can fold the cassette main body 16B so that the first segment 61 and the second segment 62 overlap each other. In order to secure the first flow path element 71 and the second flow path element 72, the first segment 61 and the second segment 62 are connected to each other by a first tube 78 having the first flow path element 71 and a second tube 79 having the second flow path element 72.

[0065] In the initial state before using the dialysis cassette 14B, the cassette main body 16B may be folded. By folding the cassette main body 16B in the initial state, the size of the dialysis cassette 14B can be reduced not only after use but also before use.

[0066] The cassette main body 16C of the dialysis cassette 14C according to the third modification example shown in FIG. 8A is different from the dialysis cassette 14 shown in FIG. 3 at the position where a plurality of liquid supply tubes 18 are connected. Specifically, in FIG. 8A, the first segment 61 of the cassette main body 16C has a first end portion 91 adjacent to the bent portion 63 and a second end portion 92 opposite to the first end portion 91. A plurality of connection ports 40 are provided at the second end portion 92. Therefore, the plurality of liquid supply tubes 18 are connected to the second end portion 92 of the cassette main body 16C.

[0067] Since a plurality of liquid supply tubes 18 are connected on the side opposite to the bent portion 63, as shown in FIG. 8B, the plurality of liquid supply tubes 18 can be wound around the folded cassette main body 16C so that the plurality of liquid supply tubes 18 partially face the bent portion 63. By winding the liquid supply tubes 18 around the folded cassette main body 16C, the folded state of the cassette main body 16C can be easily maintained.

[0068] The cassette main body 16D of the dialysis cassette 14D according to the fourth modification example shown in FIG. 9 includes a connection holding portion 94. The connection holding portion 94 can connect the first segment 61 and the second segment 62 to hold the folded state of the cassette main body 16D. In FIG. 9, the connection holding portion 94 is fixed to the back side of the first segment 61. In other embodiments, the connection holding portion 94 may be fixed to the back side of the second segment 62. The connection holding portion 94 is, for example, an attachment member 95 having an adhesive surface 951. In the initial state of the dialysis cassette 14D, a peeling sheet (not shown) is overlaid on the adhesive surface 951, and the adhesive surface 951 is covered with the peeling sheet.

[0069] After the user peels off the release sheet from the adhesive surface 951 after using the dialysis cassette 14D and bends the second segment 62 with respect to the first segment 61 as indicated by the phantom line in FIG. 9, the first segment 61 and the second segment 62 are fixed to each other via the connection holding portion 94. Thereby, the folded state of the dialysis cassette 14D can be easily maintained.

[0070] Note that the connection holding portion 94 is not limited to the above-described pasting member 95, and other modes can also be adopted. In another mode, the connection holding portion 94 may be a first engaging portion provided on the first segment 61 and a second engaging portion provided on the second segment 62. For example, one of the first engaging portion and the second engaging portion is a fitting protrusion, and the other is a fitting groove into which the fitting protrusion can be fitted. By fitting the fitting protrusion into the fitting groove, the folded state of the cassette body 16D is maintained. In still another mode, the connection holding portion 94 is a claw portion provided on one of the first segment 61 and the second segment 62, and the claw portion may be engageable with the other of the first segment 61 and the second segment 62.

[0071] The present invention is not limited to the above-described disclosure, and various configurations can be adopted without departing from the gist of the present invention. The configurations of the above-described embodiments and each modification can be partially combined with each other within a non-contradictory range.

Explanation of Signs

[0072] 10…Automated peritoneal dialysis system 12…Dialysis device main body 14, 14A to 14D…Dialysis cassette 16, 16A to 16D…Cassette body 19…Liquid supply flow path 20…Pump section 26…Heating section 38…Notch groove 61…First segment 62…Second segment 63, 63A, 63B…Bending portion

Claims

1. A cassette body having a liquid supply channel for flowing a dialysate, A pump unit provided in the cassette body for supplying the dialysate, A heating unit provided in the cassette body for heating the dialysate, A dialysis cassette that is detachable from a dialysis apparatus main body, and The cassette body, A first segment provided with the pump unit, A second segment adjacent to the first segment and provided with the heating unit, A bent portion provided between the first segment and the second segment, and The cassette body is a dialysis cassette that can be folded by the bent portion so that the first segment and the second segment overlap in the thickness direction of the cassette body.

2. In the dialysis cassette according to Claim 1, A notch groove having a groove depth in the thickness direction is provided between the first segment and the second segment so that a thin portion having a thickness smaller than that of the first segment and the second segment in the thickness direction is formed as the bent portion, A dialysis cassette in which the thin portion is bent by deforming the thin portion when a load of a predetermined level or more acts on the cassette body.

3. In the dialysis cassette according to Claim 2, In the thickness direction, the thickness of the second segment is smaller than the thickness of the first segment. A dialysis cassette.

4. In the dialysis cassette according to Claim 3, A part of the liquid supply channel is formed inside the bent portion, A covering member that covers at least a portion of the thin portion where the liquid supply channel is formed is disposed between the first segment and the second segment, The covering member is a dialysis cassette that suppresses leakage of liquid from the bent portion when the cassette body is folded.

5. In the dialysis cassette according to Claim 4, The covering member is an elastic sheet. A dialysis cassette.

6. In the dialysis cassette according to Claim 1, The bent portion is a hinge portion that rotatably connects the first segment and the second segment to each other. A dialysis cassette.

7. In the dialysis cassette according to any one of Claims 1 to 6, The first segment has a first end adjacent to the bent portion and a second end opposite to the first end, A plurality of liquid supply tubes are connected to the second end. A dialysis cassette.

8. In the dialysis cassette according to any one of claims 1 to 6, a connecting and holding portion capable of connecting the first segment and the second segment is provided in one or both of the first segment and the second segment to hold the folded state of the cassette body. The dialysis cassette.

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