JP6531982B2 - Cleaning system - Google Patents

Description

  The present invention relates to a cleaning system, for example, to a cleaning system suitable for cleaning a connection point when supplying a dialysis solution stock solution to a dialysis device.

Conventionally, in a dialysis apparatus, a dialysate circuit is provided with a supply tube, and two dialysate stock solutions are supplied to the dialysate circuit via the supply tube, and they are mixed to form a dialysate. ing. And conventionally, in order to supply the dialysate stock solution to the dialysate circuit through the feed tube, there is known a method using a soft bag and a tank in which the dialysate stock solution is stored (for example, Patent Document 1). In the dialysis device of Patent Document 1, while providing a male luer connector at the end of the supply tube, by providing a female luer connector on the soft bag side tube, both connectors are connected at the required time.
In addition, conventionally, for example, Patent Document 2 discloses a configuration of a male luer connector and a female luer connector for connecting the ends of one and the other fluid passages.
By the way, since the supply tube of the dialysis apparatus is used repeatedly, it is necessary to wash it. And conventionally, it is a dialysis apparatus of the system which sucks up the dialysate stock solution stored in a tank by a supply tube, and the composition which was made to wash a supply tube by the washing chamber provided in the main part of a dialysis device is proposed. (For example, patent document 3).

JP-H08-500511 Utility model registration No. 3125016 Patent No. 3947037

  By the way, in the dialysis device provided with the washing chamber as in the above-mentioned patent document 3, in order to detachably connect the end of the supply tube of the dialysis device and the container of the dialysis fluid stock solution, a male luer connector and a female luer connector are used. It is conceivable to use it. However, in this case, there is a problem that the configuration of the male luer connector causes insufficient cleaning of the male luer connector. More specifically, the male luer connector includes an inner cylinder and an outer cylinder, and it is difficult for the cleaning solution to flow between the outer peripheral surface of the inner cylinder and the internal thread on the inner peripheral surface of the outer cylinder opposed thereto. There is a problem that the cleaning between the inner cylinder and the outer cylinder becomes insufficient.

In view of the above-described circumstances, the present invention comprises a connector connected to one end of a supply tube, and a cleaning port to which the connector is connected at the time of cleaning and to which the cleaning solution is supplied internally, and the cleaning port In a washing system in which a washing liquid is supplied to the washing port through the washing port to feed the washing liquid to the connector and the feeding tube to wash the connector and the feeding tube by supplying the washing liquid into the washing port while the connector is connected. ,
The connector is formed with an inner cylinder to which one end of the supply tube is connected and which communicates with the inside of the washing port at the time of washing, and a female screw on an inner circumferential surface surrounding the inner cylinder and in communication with the washing port at the time of washing And the gap formed between the outer peripheral surface of the inner cylinder and the internal thread of the outer cylinder, and the gap between the outer cylinder and the outer cylinder is communicated with the outer cylinder. Provide a through hole for cleaning,
At the time of cleaning, the cleaning liquid supplied to the cleaning port is made to flow through the gap and the through hole to clean the space between the outer peripheral surface of the inner cylinder and the internal thread of the outer cylinder. .

  According to such a configuration, since the outer cylinder is provided with the through hole for cleaning, the cleaning liquid is circulated between the inner cylinder and the outer cylinder at the time of cleaning, and the cleaning liquid is circulated between the inner cylinder and the outer cylinder. Can be reliably cleaned. Therefore, in the dialysis apparatus provided with the washing port, even when the male luer connector is used at the tip of the supply tube, the internal thread on the inner surface of the outer cylinder in the male luer connector can be sufficiently washed. Therefore, it is possible to provide a cleaning system that is easy to attach and detach and easy to clean.

The front view which shows one Example of this invention. The figure which shows the circuit structure of the principal part of FIG. It is a front view of the principal part of Drawing 1, and Drawing 3 (a) shows the state where lid 11B was opened, and Drawing 3 (b) shows the state where lid 11B was closed. The longitudinal cross-sectional view of the principal part of FIG. The perspective sectional view of the principal part of FIG. The perspective view of the principal part of FIG. The enlarged view of the principal part of FIG.

Hereinafter, the present invention will be described with reference to the illustrated embodiment. In FIGS. 1 to 2, a dialysis apparatus 1 for performing dialysis treatment on a patient contains a component such as a dialysate circuit 2 and the like and a blood circuit 3 provided therein. The main body 4 and the dialyzer 5 held by the holder 4A of the main body 4 at the time of dialysis treatment are provided.
In the dialysis device 1, the first supply tube 7 has one end 7A connected to the liquid supply passage 2A of the dialysate circuit 2 and the other end 7B attached with the male luer connector 6, and the one end 8A connected to the liquid supply passage. A second supply tube 8 connected to 2A and having a connector 6 'connected to the other end 8B, and a first cleaning port provided parallel to the front of the main body 2 to which the male luer connector 6 is connected at the time of cleaning 11 and a second cleaning port 12 to which the connector 6 'is connected.

The configurations of the dialysate circuit 2, the blood circuit 3 and the dialyzer 5 are known, for example, by Japanese Patent Application Laid-Open No. 2012-191992 and the like, and the detailed description thereof is omitted here.
The first supply tube 7 serves as a supply passage for supplying the dialysate circuit 2 with the liquid A which is a dialysate stock solution, and a pump P 1 is provided in the middle of the first supply tube 7. On the other hand, the second supply tube 8 serves as a supply passage for supplying the dialysate circuit 2 with solution B, which is a dialysate stock solution, and a pump P 2 is provided in the middle of the second supply tube 8.
When a dialysis treatment is given to a patient by the dialysis device 1, the dialyzer 5 is attached to the holder 4A in advance, and at the dialyzer 5, the end of the dialysate supply passage 2B of the dialysate circuit 2 and the dialysate recovery passage 2C. The end of the is connected. Further, one end of the artery side passage 3A of the blood circuit 3 and one end of the vein side passage 3B are connected to the dialyzer 5.
Further, as shown in FIG. 1, the male luer connector 6 of the first supply tube 7 and the screw portion of the tip of the tube 13A of the soft bag 13 containing the dialysis stock solution (A stock solution) are connected and the second supply tube The connector 6 'of 8 is connected to the tank 14 containing the dialysis stock solution (B stock solution), and the nozzle 6A' of the connector 6 'is inserted into the B stock solution. Then, in a state where the pump (not shown) of the dialysate circuit 2 is operated and water is flowing in the liquid supply passage 2A, both pumps P1 and P2 are operated to make the A undiluted solution in the soft bag 13 While being supplied into the liquid supply passage 2A through the first supply tube 7, the B stock solution in the tank 14 is supplied into the liquid supply passage 2A through the second supply tube 8. The A-stock solution and the B-stock solution supplied into the fluid supply passage 2A are then mixed in the dialysate circuit 2 to form a dialysate.
Then, the dialysate prepared in the dialysate circuit 2 is supplied from the dialysate supply passage 2B to the dialyser 5, and is then recovered through the dialysate recovery passage 2C. The blood in the blood circuit 3 connected to the dialyzer 5 is cleaned by the dialysate. Thus, the dialysis treatment is given to the patient by the dialysis device 1.

As described above, the dialysis treatment is given to the patient by the dialysis device 1, but since the dialysis device 1 is used repeatedly, it is necessary to wash the dialysate circuit 2 before the start of each dialysis treatment. At the same time, it is necessary to wash the first supply tube 7 and the second supply tube 8 and the male luer connector 6 and the connector 6 'provided thereon.
Therefore, the dialysis device 1 of the present embodiment has the first cleaning port 11 and the second cleaning port 12 in the front of the main body 4 in order to clean both the supply tubes 7 and 8 and the male luer connector 6 and the connector 6 '. It is provided. Then, as shown in FIG. 2, when washing the dialysate circuit 2, the male luer connector 6 of the first supply tube 7 is connected to the first washing port 11, and the connector 6 'of the second supply tube 8 is 2 is connected to the washing port 12
In this embodiment, a first washing passage 17 and a second washing passage 18 are provided to wash the supply tubes 7 and 8, the male luer connector 6 and the connector 6 '. One end 17 A of the first cleaning passage 17 is connected to the liquid supply passage 2 A of the dialysate circuit 2. The other end of the first cleaning passage 17 is branched into two, and one branched end 17B is connected to the first cleaning port 11, and the other branched end 17C is cleaned as a second cleaning. It is connected to port 12. A normally closed electromagnetic on-off valve V4 is provided in the middle of the first cleaning passage 17, and the electromagnetic on-off valve V4 is opened at the time of cleaning.
One end 18 A of the second washing passage 18 is connected to a drainage passage (not shown) of the dialysate circuit 2. The other end of the second cleaning passage 18 is branched into two, and one branched end 18B is connected near the opening of the first cleaning port 11, and the other branched end 18C is connected. It is connected near the opening of the second cleaning port 12. Further, a normally closed electromagnetic on-off valve V1 is provided in the middle of the second cleaning passage 18, and a normally closed electromagnetic on-off valve V2 is provided between the branch location and one end 18B and between the branch location and the other end 18C. , V3 are provided.

When cleaning the dialysate circuit 2, as shown by the dotted line in FIG. 2, the end of the dialysate supply passage 2B and the dialysate recovery passage 2C are removed from the dialyzer 5, and they are connected to the connector 21. They are connected to each other. Further, the male luer connector 6 of the first supply tube 7 is connected to the first cleaning port 11, and the connector 6 ′ of the second supply tube 8 is connected to the second cleaning port 12.
At the time of cleaning of the dialysate circuit 2, the cleaning solution flows in the dialysate passage 2 and the solenoid on-off valve V 4 is opened, so both cleanings are performed via the first cleaning passage 17 communicating with the fluid supply circuit 2 A of the dialysate passage 2. Cleaning fluid is supplied to the ports 11 and 12. The cleaning liquid supplied to both cleaning ports 11 and 12 flows through the male luer connector 6 and the first supply tube 7 to return to the liquid supply passage 2A, and flows through the connector 6 'and the second supply tube 8 to be supplied. The fluid is returned to the fluid passage 2A. Further, by stopping the pumps P1 and P2 and stopping the both supply tubes 7 and 8, the male on / off connector 6 and the connector 6 are opened by opening the electromagnetic on-off valves V1 to V3 of the second washing passage 18 at appropriate timing. The cleaning solution flowing through the inside can be discharged through the second cleaning passage 18. Thereby, both supply tubes 7, 8 and male luer connectors 6, 6 'can be cleaned.

Thus, in the present embodiment, the male luer connector 6 is adopted as a connector of the first supply tube 7, and the receiving portion 26 of the male luer connector 6 is provided in the first washing port 11, so that the attaching and detaching work at the time of washing And the male luer connector 6 itself can be sufficiently cleaned.
As shown in FIGS. 3 to 7, at the center in the height direction of the front of the main body 4, the stepped cylindrical first cleaning port 11 is formed with the opening 11 </ b> A positioned on the front, The deepest end of the first cleaning port 11 is connected to the end 17 B of the first cleaning passage 17 via a coupling 22. The opening 11A of the first cleaning port 11 is opened and closed by an openable and closable lid 11B, and the opening 11A is closed by the lid 11B except during cleaning.
At the inward position adjacent to the opening 11A, an engagement hole 11C in which square holes are continuously provided at two places in the circumferential direction is formed, and the inward position adjacent to the engagement hole 11C is a large diameter portion 11D It has become. Further, the medium diameter portion 11E is formed at the adjacent inward position of the large diameter portion 11D, and at the adjacent inward position, the tapered portion 11F whose diameter on the back side gradually decreases is formed. A small diameter portion 11G is formed at an adjacent inward position of the tapered portion 11F.
An annular collar 23A having elasticity is fixed to the end face on the inner side of the large diameter portion 11D, and a cylindrical packing 23B having elasticity is fixed to the inner peripheral surface of the middle diameter portion 11E. As shown in FIG. 4, when the male luer connector 6 is fitted to the washing port 11, the male luer connector 6 is moved to the first washing port 11 (large diameter portion 11D) by the resilient force of the collar 23A and the packing 23B. And the middle diameter portion 11E), and the liquid tightness is maintained firmly.
The proximity switch 24 for detecting the magnetic force is provided on the outer peripheral portion of the large diameter portion 11D, and as shown in FIG. 4, when the male luer connector 6 is reliably fitted to the first cleaning port 11, the male luer connector The magnetic force of the magnet 25 on the sixth side is detected. When the proximity switch 24 detects the magnetic force of the magnet 25, the male luer connector 6 is fitted to the first cleaning port 11, and it can be confirmed that both are properly connected.
In the present embodiment, the receiving portion receiving portion 26 of the male luer connector is configured by the engagement hole 11C, the large diameter portion 11D, the middle diameter portion 11E, the collar 23A and the packing 23B in the first cleaning port 11. Further, the internal space of the tapered portion 11F and the small diameter portion 11G is a cleaning chamber 27. Further, a drainage port 11H protrudes from the outer peripheral surface of the taper portion 11F constituting the cleaning chamber 27, and the end 18B of the second cleaning fluid passage 18 is connected to the drainage port 11H.

Next, the male luer connector 6 attached to the other end 7B of the first supply tube 7 will be described. The male luer connector 6 includes an inner cylinder 31 located closest to the axial center, and an outer cylinder 32 integrally formed with the inner cylinder 31 on the outer peripheral portion at one end side (tip end side) of the inner cylinder 31 in the axial direction. A stepped cylindrical lock member 33 is provided to cover the outer peripheral surfaces of the cylinder 31 and a part of the outer cylinder 32.
The lock member 33 has a large diameter flange portion 33A formed in a substantially central portion in the axial direction, a small diameter portion 33B positioned on the tip side (right side in the drawing) than the large diameter flange portion 33A, and the small diameter portion A small diameter flange portion 33C formed at the axial center of the portion 33B and a grip portion 33D whose inside is hollow continuously from the large diameter flange portion 33A are provided.
The inner cylinder 31 is formed in an elongated cylindrical shape.
On the other hand, the outer cylinder 32 is formed integrally with the inner cylinder 31 so as to surround the inner cylinder 31, and the axial length of the outer cylinder 32 is equal to or less than half the axial length of the inner cylinder 31. . The inner peripheral surface at the tip end side (right side) of the outer cylinder has an inner diameter larger than that at the other end side, and forms an annular recess 32A. An internal thread 32B is formed on substantially the entire inner peripheral surface of the annular recess 32A.
On the other hand, the inner peripheral surface on the tip end side of the small diameter portion 33B in the lock member 33 is an annular recess 33E, and substantially half of the outer peripheral surface of the outer cylinder 32 is fitted there. The region on the side is made to penetrate the small diameter portion 33B of the lock member 33 and positioned in the internal space of the grip portion 33D. Since the stopper 35 is engaged with the outer peripheral portion of the inner cylinder 31 in the grip portion 33D, the inner cylinder 31 and the outer cylinder 32 can not be moved in the axial direction with respect to the lock member 33. Further, an annular seal member 36 is attached to the outer peripheral portion of the outer cylinder 32, and the seal member 36 maintains liquid tightness between the outer peripheral surface of the outer cylinder 32 and the inner peripheral surface of the annular recess 33E of the lock member 33. ing.

The outer cylinder 32 is in a state in which the outer peripheral surface on the tip end side (right side) is exposed further outward than the lock member 33 than the central portion in the axial direction. The tip end portion of the inner cylinder 31 also protrudes outward beyond the lock member 33 as the outer cylinder 32 does. On the other hand, the end 7B of the first supply tube 7 is connected to the end of the inner cylinder 31 located in the grip 33D.
A cylindrical gap 32C is formed between the annular recess 32A and the female thread 32B of the outer cylinder 32 and the outer peripheral surface of the inner cylinder 31 opposed to them. The male luer connector 6 and the tube 13A of the soft bag 13 can be connected by screwing the screw portion formed at the tip of the tube 13A of the soft bag 13 with the female screw 32B of the outer cylinder 32. .

  Further, in the outer cylinder 32 of the present embodiment, a plurality of radial through holes 32D are bored at an adjacent position where the internal thread 32B is interrupted so as to communicate with the gap 32C. The cleaning through holes 32D are formed at four positions at equal intervals in the circumferential direction. As described above, the gap 32C is maintained between the external thread 32B of the outer cylinder 32 and the outer peripheral surface of the inner cylinder 31 facing the annular recess 32A, but in the present embodiment, the gap 32C communicates with the gap 32C. The outer cylinder 32 is formed with a through hole 32D for cleaning. Since the plurality of cleaning through holes 32D are formed, in the present embodiment, it is possible for the cleaning liquid to flow in the gap 32C, whereby the threaded portion of the tip of the tube 13A is The outer surface of the female screw 32B which is repeatedly attached and detached and the inner cylinder 31 opposed thereto can be cleaned.

  On the other hand, two places in the circumferential direction of the small diameter flange 33C of the lock member 33 form overhanging portions 33F which are projected as a three-dimensional shape, whereby the outline of the small diameter flange 33C is the engagement hole 11C shown in FIG. It is shaped according to the Further, the magnet 25 is accommodated in the inside of one projecting portion 33F in the small diameter flange portion 33C. Furthermore, the inner peripheral edge of the tip of the lock member 33, that is, the inner peripheral edge of the small diameter portion 33B, is a tapered surface 33G whose diameter gradually increases on the opening side (end) side. The tapered surface 33G covers the plurality of cleaning through holes 32B from the radially outer side. The presence of the tapered surface 33G makes it easy to guide the cleaning liquid flowing through the through hole 32D to the discharge port 11H.

The male luer connector 6 configured as described above is connected to the first cleaning port as follows before the start of the cleaning operation. That is, as shown in FIG. 3A, after opening the lid 11B of the first cleaning port 11, the male luer connector 6 of the first supply tube 7 is inclined 45 ° counterclockwise with respect to the vertical direction The small diameter flange portion 33C and the projecting portion 33F are inserted into the engagement hole 11C, and thereafter, the entire male connector 6 is rotated 45 ° clockwise. Thereby, as shown in FIGS. 4 to 7, the small diameter flange portion 33C abuts on the collar 23A, and the overhanging portion 33F abuts on the left end face of the large diameter portion 11D. Further, the outer peripheral surface of the small diameter portion 33B is in close contact with the cylindrical packing 23B, and the liquid tightness of the portion is maintained. Thus, the male luer connector 6 is connected to the first washing port 11. Then, it can be confirmed that the proximity switch 24 detects the magnetic force of the magnet 25 that both are connected securely.
Thus, in the state where the male luer connector 6 is connected to the first cleaning port 11, the tip of the outer cylinder 32 on the male luer connector 6 side, the inner cylinder 31 and the small diameter portion 33B of the lock member 33 is located in the cleaning chamber 27 A clearance 32C at the location of the female screw 32B also communicates with the cleaning chamber 27. Further, the four through holes 32D for cleaning and the tapered surface 33G are located at positions overlapping with the opening on the inner side of the discharge port 11H.
The configuration of the connector 6 'of the second supply tube 8 in this embodiment is the same as that of the male luer connector 6, and the configuration of the second washing port 12 is also the same as that of the first washing port 11. It is done. That is, in the second cleaning port 12, a cylindrical space capable of fitting the connector 6 'is formed, and the inside of the space is a cleaning chamber. The end 17C of the first cleaning passage 17 is connected to the end of the cleaning chamber (see FIG. 2). In the vicinity of the opening of the second cleaning port 12, a discharge port similar to the discharge port 11H of the first cleaning port 11 is formed, and the end 18C of the second cleaning passage 18 is connected to the discharge port. (See Figure 2). The connector 6 'of the second supply tube 8 is also connected to the second cleaning port 12 before the start of the cleaning operation.

As described above, in the state where the male luer connector 6 on the first supply tube 7 side is connected to the first cleaning port 11 and the connector 6 ′ on the second supply tube 8 side is connected, When the cleaning is started, the electromagnetic on-off valve V4 of the first cleaning passage 17 is opened. As a result, since the cleaning liquid is supplied to both the cleaning ports 11 and 12 through the first cleaning passage 17, the cleaning of both supply tubes 7 and 8 is performed.
More specifically, cleaning of both supply tubes 7, 8 and male luer connector 6, and connector 6 'is performed in the following order. At the start of cleaning, since the electromagnetic switching valves V1 to V3 of the second cleaning passage 18 are closed, the cleaning solution supplied into the cleaning chamber 27 of the first cleaning port 11 is, as shown in FIG. After flowing through the inside of the inner cylinder 31 and then flowing through the inside of the first supply tube 7, it is returned to the dialysate circuit 2. Thus, the inside of the inner cylinder 31 and the first supply tube 7 is first cleaned by the cleaning liquid. The connector 6 'connected to the second cleaning port 12 and the second supply tube 8 are similarly cleaned by the cleaning solution.
Then, when the required time has elapsed from the start of cleaning, the pumps P1 and P2 are stopped, and the electromagnetic on-off valves V1 to V3 of the second cleaning passage 18 are opened for a predetermined time. Therefore, as shown in FIG. 2, the cleaning liquid supplied into the cleaning chamber 27 of the first cleaning port 11 flows through the gap 32C between the inner cylinder 31 and the female screw 32B and the cleaning through hole 32D communicating therewith. Further, after being guided by the tapered portion 33G, the fluid is discharged through the second cleaning passage 18 through the discharge port 11H. As described above, when the cleaning liquid flows in the gap 32C, the outer peripheral surface of the female screw 32B and the inner cylinder 31 opposed thereto can be reliably cleaned by the cleaning liquid. The same applies to the connector 6 'on the second cleaning port 12 side. As described above, when the cleaning operation of the dialysis circuit 2 and the both supply tubes 7 and 8 is finished, the electromagnetic on-off valves V1 to V4 are closed.
When the cleaning operation is completed and the male luer connector 6 is removed from the first cleaning port 11, the operation is reverse to the above-described attachment. The same applies to the case where the connector 6 'is removed from the second cleaning port 12.

As described above, in the present embodiment, the male luer connector 6 is adopted as a connector for the first supply tube 7, while the first washing port 11 becomes the receiving portion 26 to which the male luer connector is attached and detached. ing. Therefore, attachment / detachment work of male luer connector 6 and receiving part 26 accompanying cleaning work is easy.
Further, in the present embodiment, since the outer cylinder 32 of the male luer connector 6 is provided with a plurality of cleaning through holes 32D, the external thread 32B of the outer cylinder 32 and the outer peripheral portion of the inner cylinder 31 opposed thereto are cleaned. Can be reliably cleaned. Therefore, according to the present embodiment, it is possible to provide a cleaning system which is easy to attach and detach and easy to clean.

In the above embodiment, as shown in FIG. 2, although the end 17 B of the first cleaning passage 17 is connected to the first cleaning port 11, the end of the first cleaning passage 17 is connected to the first cleaning port 11. It is not necessary to connect the part 17B. In this case, at the time of cleaning, by opening the solenoid on-off valves V1 and V2 of the second cleaning passage 18, after the cleaning solution flows from the dialysate circuit 2 to the inside of the first supply tube 7 and the inside of the male luer connector 6. And is discharged to the outside through the second cleaning solution passage 18. Thus, the first supply tube 7 and the male luer connector 6 can be reliably cleaned.
Further, although the above embodiment applies the present invention to the cleaning system of the dialysis device 1, the present invention can be applied to the connection points of one and the other fluid passages in devices other than the dialysis device.

1. Dialysis apparatus 2 .. Dialysate circuit 3 .. Blood circuit 6 .. Male luer connector 7 .. First supply tube 11 .. First wash port 13 .. Soft bag 17. 17. First wash passage 27. Wash chamber 31. Inner cylinder 32 .. Outer cylinder 32A .. Annular recess 32B .. Female thread 32C .. Gap 32D .. Through hole

Claims (4)

A connector connected to one end of the supply tube and a cleaning port to which the connector is connected during cleaning and to which the cleaning solution is supplied, and in the state where the connector is connected to the cleaning port during cleaning In a cleaning system in which a cleaning solution is supplied to the connector and the supply tube via the inside of the cleaning port by supplying a cleaning solution to clean the connector and the supply tube,
The connector is formed with an inner cylinder to which one end of the supply tube is connected and which communicates with the inside of the washing port at the time of washing, and a female screw on an inner circumferential surface surrounding the inner cylinder and in communication with the washing port at the time of washing And the gap formed between the outer peripheral surface of the inner cylinder and the internal thread of the outer cylinder, and the gap between the outer cylinder and the outer cylinder is communicated with the outer cylinder. Provide a through hole for cleaning,
During the cleaning, the cleaning system supplied to the cleaning port is made to flow through the gap and the through hole to clean the space between the outer peripheral surface of the inner cylinder and the internal thread of the outer cylinder.   The outer cylinder is provided with an annular recess on the side facing the inside of the cleaning port, and the above-mentioned internal thread is formed in this annular recess, and a plurality of the above-mentioned through holes are provided in a portion of the annular recess where the internal thread is not formed. The cleaning system according to claim 1, characterized in that:   In the cleaning port, a drain port is formed in which the opening on the inner side is polymerized with the through hole for cleaning, and a part of the cleaning liquid flowing through the clearance and the through hole is discharged from the drainage port. The cleaning system according to claim 2, wherein the cleaning system discharges out of the cleaning port.   The other end of the feed tube is connected to the dialysate circuit of the dialyzer, and the threaded portion of the tip of the tube of the dialysate stock solution container is screwed into the female screw of the connector, so that the feed tube is interposed. The dialysate stock solution is supplied to the dialysate circuit, and the washing liquid supplied to the dialysate circuit is supplied to the washing port through the washing passage when the dialysate circuit is washed. The cleaning system according to any one of claims 1 to 3, characterized by

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