JP2021145884A - Dialysis cassette and pump thereof - Google Patents

Abstract

To provide a dialysis cassette whose manufacturing cost can be reduced by decreasing the number of components and the number of assembly man-hours, and a pump thereof.SOLUTION: A diaphragm pump 12 of a dialysis cassette 10 comprises a pump body 20 comprising a concave pump chamber 32, a pump diaphragm 24 covering the pump chamber 32, a pump lid 28 comprising a pressing part 52 for pressing a peripheral edge part of the pump diaphragm 24, a first seal part 42 for liquid-tightly sealing a space on a lower side of the pump diaphragm 24 in the pump chamber 32 by being in contact with the pump diaphragm 24, and a second seal part 62 comprising an annular protrusion part 44 protruding from the pump body 20 toward the pump lid 28, and an annular rib structure 60 protruding from the pump lid 28, and air-tightly fitted to the annular protrusion part 44.SELECTED DRAWING: Figure 7

Description

The present invention relates to a dialysis cassette mounted on a peritoneal dialysis machine and a pump thereof.

Peritoneal dialysis machines that allow patients to perform peritoneal dialysis at home or the like are widespread. The peritoneal dialysis machine has a function of automatically discharging the dialysate into the peritoneum and sending the dialysate. The diaphragm pump that feeds the dialysate, the heating tube that heats the dialysate, and the flow path switching unit that switches the flow path are provided as an integrally formed dialysate cassette. When the user starts using the peritoneal dialysis machine, the user sets a dialysis cassette in the peritoneal dialysis machine and performs peritoneal dialysis (Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-182254

Since the dialysis cassette is disposable every time the peritoneal dialysis machine is used, further cost reduction is required.

Therefore, one embodiment aims to provide a dialysis cassette and a pump thereof that can suppress manufacturing costs by reducing the number of parts and assembly man-hours.

One aspect of the following disclosure is a dialysis cassette having a pump for feeding dialysate, a heating tube for heating dialysate, and a flow path switching section for switching the flow path to which the pump is connected. The pump is in contact with the pump body having a concave pump chamber, the pump membrane covering the pump chamber, the pump lid having a pressing portion for pressing the peripheral edge of the pump membrane, and the pump membrane. The pump membrane is sandwiched between the pressing portion and the first seal portion that tightly seals the space under the pump membrane of the pump chamber, and the pump body toward the pump lid. A dialysis cassette comprising a protruding annular projection and a second sealing portion having an annular rib structure that projects from the pump lid and airtightly fits the annular projection.

Another viewpoint is that a pump for sending dialysate, a heating tube for heating dialysate, and a flow path switching portion for switching the flow path to which the pump is connected are integrally formed. A pump of a dialysis cassette, a pump body having a concave pump chamber, a pump membrane covering the pump chamber, a pump lid having a pressing portion for pressing a peripheral portion of the pump membrane, and the pump membrane. The pump membrane is sandwiched between the pressing portion and the first seal portion that is in contact with the pump chamber and seals the space under the pump membrane in a liquid-tight manner, and the pump body is directed toward the pump lid. The pump is provided with a second sealing portion having an annular protrusion projecting from the pump and an annular rib structure projecting from the pump lid and airtightly fitting the annular protrusion.

According to the dialysis cassette and its pump from the above viewpoint, the O-ring is not required for the second seal portion that airtightly seals the space above the pump chamber partitioned by the pump membrane, so that the material cost and the O-ring are reduced. The mounting process is not required, and the manufacturing cost is suppressed.

It is explanatory drawing which shows the treatment method by peritoneal dialysis. It is external perspective view of the peritoneal dialysis apparatus and the dialysis cassette which concerns on embodiment. It is a schematic diagram which shows the circuit structure of the dialysate of FIG. It is a perspective view of the pump of the dialysis cassette of FIG. It is an exploded perspective view of the pump of FIG. It is sectional drawing along the VI-VI line of the pump of FIG. It is a partially enlarged sectional view which shows the 1st and 2nd seal part of the pump of FIG. It is sectional drawing which shows the operation of the pump of FIG.

Hereinafter, a dialysis cassette 10 and a diaphragm pump 12 (pump) thereof will be described with reference to suitable embodiments.

Peritoneal dialysis is a treatment method in which dialysate is injected into the abdominal cavity surrounded by the peritoneum. When the dialysate is placed in the abdominal cavity for a certain period of time, waste products, salts, excess water, etc. in the blood move to the dialysate side in the abdominal cavity through the peritoneum. Blood can be purified and kidney function can be supplemented by taking out the dialysate when the waste products, water, etc. are sufficiently transferred to the dialysate.

Peritoneal dialysis includes continuous ambulatory peritoneal dialysis (CAPD) and automated peritoneal dialysis (APD). The upper part of FIG. 1 shows a treatment example of continuous portable peritoneal dialysis. In continuous portable peritoneal dialysis, the dialysate is exchanged about 3 to 5 times a day at the timing of the upward arrow in the figure. When exchanging the dialysate, the drainage bag 109 and the dialysate bag 110 are connected to the dialysate catheter 112 placed in the abdominal cavity by the patient or a caregiver, and the dialysate is discharged from the abdominal cavity and new. Operations such as injecting dialysate are performed in order.

On the other hand, automatic peritoneal dialysis (APD) is a method of automatically exchanging dialysate using an automatic peritoneal dialysis machine (also referred to as a cycler, hereinafter referred to as a peritoneal dialysis machine 100). The lower part of FIG. 1 shows a treatment example of automatic peritoneal dialysis. In automatic peritoneal dialysis, the dialysate is automatically exchanged mainly by using the sleeping time. Automatic peritoneal dialysis is widespread because it allows a lot of free time during the day.

The peritoneal dialysis apparatus 100 shown in FIG. 2 is used for automatic peritoneal dialysis. The peritoneal dialysis machine 100 includes a dialysis machine main body 101 and a dialysis cassette 10. On the lower front side of the dialysis apparatus main body 101, a cassette mounting portion 102 having an opening 102a and a lid member 102b for mounting the dialysis cassette 10 from the front surface is provided. By rotating, the lid member 102b is displaced into a closed state in which the opening 102a is closed and an open state in which the opening 102a is exposed.

A start button 104a for performing a treatment start operation and a stop button 104b for performing a treatment stop operation are provided on the upper portion of the dialysis apparatus main body 101. A display unit 106 is provided between the start button 104a and the stop button 104b. The display unit 106 is composed of a touch panel provided with a liquid crystal display panel. The display unit 106 can input various setting information required for dialysis by pressing the touch panel. Further, the dialyzer main body 101 is provided with a speaker 108. The speaker 108 outputs information such as the content of the operation instruction and the operation guidance by voice.

As shown in FIG. 3, the dialysis cassette 10 switches between a diaphragm pump 12 (pump) for sending dialysate, a heating tube 14 for heating dialysate, and a tube to which the diaphragm pump 12 is connected. A flow path switching unit 16 and a connection port 18 extending from the flow path switching unit 16 are provided. These members are integrated by being housed in a housing 10a made of a hard resin material.

The diaphragm pump 12 functions as a pump that sends dialysate by expanding and contracting the pump membrane 24 according to the supply and discharge of operating air from the dialyzer main body 101. The details of the diaphragm pump 12 will be described later.

The heating tube 14 has a function of heating the dialysate to be injected into the lumen of the patient. The heating tube 14 includes a meandering flow path and a sheet-shaped heating heater arranged so as to sandwich the flow path from above and below.

The flow path switching unit 16 has a function of switching the connection destinations of a plurality of tubes communicating with the diaphragm pump 12, the heating tube 14, and the connection port 18. The flow path switching unit 16 includes a fluid circuit that connects a plurality of tubes communicating with the diaphragm pump 12, the heating tube 14, and the connection port 18 via the plurality of branch portions. A plurality of clamp portions 16a are provided to clamp one or a plurality of locations of the tube included in the fluid circuit. The clamp portion 16a is closed by the clamp member of the dialysis machine main body 101. The flow path switching unit 16 switches between the injection process of the dialysate into the abdominal cavity of the patient and the discharge process of the dialysate into the abdominal cavity.

In the dialysate injection process, the flow path switching unit 16 forms a flow path that communicates the dialysate bag 110, the diaphragm pump 12, the heating tube 14, and the dialysis catheter 112 in this order. Further, in the dialysate discharge process, the flow path switching unit 16 forms a flow path leading to the dialysis catheter 112, the flow path switching unit 16, and the drainage tank 114 in this order.

Further, the flow path switching unit 16 opens or shuts off the flow path connected to the heating tube 14. In the dialysate injection process and the priming process of filling the heating tube 14 with the dialysate, the flow path switching unit 16 opens the flow path to the heating tube 14, and the heating tube 14 is used during other periods. Block the flow path to.

The flow path stretched around the dialysis cassette 10 including the heating tube 14 and the flow path switching portion 16 is made of a flexible resin material.

Four connection ports 18 are provided at one end of the dialysis cassette 10. The dialysis catheter 112 is connected to the first connection port 18a via the piping member 111. One or more dialysate bags 110 are connected to the second connection port 18b. An additional dialysate bag 116 containing a dialysate having a component different from that of the dialysate of the dialysate bag 110 is connected to the third connection port 18c. A drainage tank 114 is connected to the fourth connection port 18d.

Hereinafter, the diaphragm pump 12 (pump) of the dialysis cassette 10 will be described.

As shown in FIG. 5, the diaphragm pump 12 includes a pump main body 20, an O-ring 22 (annular seal member), a pump membrane 24, a membrane ring 26, and a pump lid 28.

As shown in FIG. 4, the diaphragm pump 12 is formed in a columnar shape, and is configured by attaching a circular pump lid 28 on the pump body 20 on the lower end side. Mounting pieces 30 are provided at a plurality of locations in the circumferential direction on the outer side of the pump lid 28, and the diaphragm pump 12 is mounted on the housing 10a of the dialysis cassette 10 via the mounting pieces 30.

As shown in FIG. 5, the pump main body 20 has a pump chamber 32 formed in a concave shape at a central portion. The surface of the pump chamber 32 is formed of a smooth curved surface such as a paraboloid or a spherical surface. A communication hole 36 that communicates with the liquid passage 34 is provided at the bottom (central portion) of the pump chamber 32.

As shown in FIG. 6, inside the pump main body 20, a liquid passage 34 through which dialysate flows extends from the central portion toward the outer peripheral side. The inner peripheral end of the liquid passage 34 is connected to the communication hole 36. Further, the outer peripheral end of the liquid passage 34 is exposed on the side of the pump body 20. A tube extending from the flow path switching portion 16 of the dialysis cassette 10 is connected to the outer peripheral end of the liquid passage 34.

An outer peripheral portion 38 is formed on the outside of the pump chamber 32 of the pump body 20. The outer peripheral portion 38 is formed with an annular groove 40 provided adjacent to the outside of the pump chamber 32 so as to surround the pump chamber 32, and an annular protrusion 44 provided so as to surround the outside of the annular groove 40. Has been done. The annular groove 40 is formed to have a width and depth capable of accommodating the O-ring 22, and the O-ring 22 is fitted therein. As will be described later, the annular groove 40 and the O-ring 22 form a first sealing portion 42 that tightly seals the space under the pump membrane 24 of the pump chamber 32.

The annular protrusion 44 of the pump body 20 is formed so as to project from the outer peripheral portion 38 toward the pump lid 28 in a wall shape. As will be described later, the annular protrusion 44 constitutes a part of the second seal portion 62 that airtightly seals the space above the pump membrane 24 of the pump chamber 32.

A male screw 46 is formed on the outer side of the pump body 20. The female screw 48 of the pump lid 28 is screwed into the male screw 46. As shown in FIG. 6, the screw structure 50 is composed of a male screw 46 and a female screw 48. The pump lid 28 is attached to the pump body 20 in a state of being pressed toward the pump body 20 side through the screw structure 50.

As shown in FIG. 5, a pump membrane 24 is provided on the pump body 20 and the O-ring 22. The pump membrane 24 is a thin sheet-like member made of an elastic material such as silicon rubber, and is formed in a circular shape. The pump membrane 24 is arranged so as to cover the pump chamber 32 of the pump main body 20, and has a lower space communicating with the liquid passage 34 and an upper space communicating with the through hole 28a of the pump lid 28. Divide into. The peripheral edge of the pump membrane 24 is arranged inside the annular protrusion 44, and the lower surface of the pump membrane 24 comes into contact with the O-ring 22. The O-ring 22 is in close contact with the pump membrane 24 to tightly seal the space under the pump chamber 32.

A membrane ring 26 is arranged on the peripheral edge of the pump membrane 24. The film ring 26 is an annular plate member formed of a metal material such as stainless steel or a hard resin material. As shown in FIG. 6, the membrane ring 26 is arranged between the pump lid 28 and the pump membrane 24 to support the flexible pump membrane 24. By providing the membrane ring 26, when the pump lid 28 is tightened to the pump main body 20, wrinkles can be prevented from entering the pump membrane 24, and the sealing property of the first sealing portion 42 can be maintained.

The pump lid 28 is attached so as to cover the upper part of the pump main body 20. The pump lid 28 includes a pressing portion 52 facing the outer peripheral portion 38 of the pump main body 20, and a side wall portion 54 extending from the outer peripheral side of the pressing portion 52 toward the pump main body 20 side (lower side). A through hole 28a having an inner diameter similar to that of the pump chamber 32 is formed in the central portion of the pressing portion 52. The pump membrane 24 is exposed from the through hole 28a. As shown in FIG. 8, the upper end surface 52a of the pressing portion 52 is a portion to which the air chamber 118 of the dialysis machine main body 101 is connected, and in order to exhibit the adhesion of the air chamber 118 to the seal member 118a. It is formed as a smooth surface.

As shown in FIG. 7, the lower end surface 52b of the pressing portion 52 comes into contact with the film ring 26. With the pump lid 28 tightened to the pump body 20, the pressing portion 52 presses the pump membrane 24 toward the O-ring 22 via the membrane ring 26 to exhibit the sealing property of the first sealing portion 42. Let me. Further, the lower end surface 52b of the pressing portion 52 is provided with an annular rib structure 60 at a portion facing the annular protrusion 44.

The annular rib structure 60 is a rib protruding downward from the lower end surface 52b toward the pump main body 20, and includes an inner peripheral rib 56 and an outer peripheral rib 58. The inner peripheral rib 56 and the outer peripheral rib 58 are formed concentrically. The inner peripheral rib 56 is a rib that abuts on the inner peripheral side of the annular protrusion 44, and its outer diameter is formed to be slightly larger than the inner diameter of the annular protrusion 44. When the pump lid 28 is tightened to the pump body 20, the inner peripheral rib 56 presses the annular protrusion 44 toward the outer peripheral side.

The outer peripheral rib 58 is a rib formed on the outer peripheral side of the inner peripheral rib 56, and is formed at a position separated from the inner peripheral rib 56 by the same distance as the radial dimension of the annular protrusion 44. The protruding height of the outer peripheral rib 58 is lower than the protrusion of the inner peripheral rib 56. Further, the outer peripheral rib 58 is composed of an inclined surface on the inner side surface and the outer side surface, and the cross section is formed to be tapered in a triangular shape. The outer peripheral rib 58 comes into contact with the annular protrusion 44 pressed toward the outer circumference via the inner peripheral rib 56, and receives the pressing force acting on the annular protrusion 44.

As described above, the annular rib structure 60 is fitted with the annular protrusion 44 in a state where a pressing force is applied from the inner peripheral rib 56 to the annular protrusion 44 toward the outer periphery, whereby the pump lid 28 and the pump body 20 are formed. A second seal portion 62 is configured to airtightly seal the gap between the two.

The side wall portion 54 of the pump lid 28 is formed to have an inner diameter larger than the outer diameter of the pump main body 20, and a female screw 48 to be screwed into the male screw 46 of the pump main body 20 is formed on the inner peripheral surface thereof. .. By tightening the female screw 48 of the pump lid 28 to the male screw 46 of the pump body 20, the sealing properties of the first sealing portion 42 and the second sealing portion 62 are exhibited.

The dialysis cassette 10 and the diaphragm pump 12 of the present embodiment are configured as described above, and their actions will be described below.

As shown in FIG. 5, in assembling the diaphragm pump 12, the pump main body 20 is first prepared, and the O-ring 22 is fitted into the annular groove 40 of the pump main body 20. After that, a step of arranging the pump membrane 24 and the membrane ring 26 inside the annular protrusion 44 of the pump body 20 is performed. After that, the pump lid 28 is prepared, and the female screw 48 of the side wall portion 54 of the pump lid 28 is screwed into the male screw 46 of the pump body 20, and the step of mounting the pump lid 28 is performed.

As the pump lid 28 is tightened to the pump body 20, the inner peripheral rib 56 is pressed against the outer peripheral portion 38 of the pump body 20. The inner peripheral rib 56 positions the pump membrane 24 and the membrane ring 26 so as to fit in a predetermined position on the inner peripheral side. Then, the membrane ring 26 and the pump membrane 24 are pressed against the O-ring 22 by the lower end surface 52b of the pressing portion 52 of the pump lid 28, and the first sealing portion 42 is liquid-tightly sealed.

Further, by tightening the pump lid 28, the annular protrusion 44 is fitted between the inner peripheral rib 56 and the outer peripheral rib 58 of the annular rib structure 60, and the second seal portion 62 is brought into close contact with the second seal portion 62. As described above, in the diaphragm pump 12 of the present embodiment, it is only necessary to attach the O-ring 22 only to the first seal portion 42, the cost of parts can be suppressed, and the step of fitting the O-ring 22 can be reduced. , Manufacturing cost can also be suppressed.

As shown in FIG. 2, the dialysis cassette 10 is used by being set in the dialysis apparatus main body 101. In this case, as shown in FIG. 8, the air chamber 118 on the side of the dialysis machine main body 101 is pressed against the upper surface (upper end surface 52a of the pressing portion 52) of the pump lid 28 of the diaphragm pump 12 and is airtightly connected. .. Then, the operating air is supplied and discharged through the air chamber 118.

The operating air is supplied to the space above the pump membrane 24 of the pump chamber 32 through the through hole 28a of the pump lid 28. Then, the pump membrane 24 moves up and down due to the pressure of the operating air, and the volume of the space under the pump membrane 24 of the pump chamber 32 increases or decreases. By such an operation, the dialysate is sent by the diaphragm pump 12. The dialysis apparatus main body 101 manages the amount of dialysate to be delivered based on the capacity (pressure) of the operating air supplied to the diaphragm pump 12. Therefore, the diaphragm pump 12 is required to have a sealing property that does not cause leakage of dialysate and a sealing property that does not leak operating air to the outside.

In the diaphragm pump 12 of the present embodiment, the space under the pump membrane 24 of the pump chamber 32 is liquid-tightly sealed by the first seal portion 42 in which the O-ring 22 is in close contact with the pump membrane 24 from the lower side. This prevents the dialysate from leaking. Further, in the second seal portion 62 provided on the outer peripheral side of the first seal portion 42, the annular protrusion 44 of the pump body 20 fits into the annular rib structure 60 of the pump lid 28, whereby the pump body 20 and the pump are pumped. The gap with the lid 28 is hermetically sealed. As a result, the operating air supplied to the diaphragm pump 12 can be prevented from leaking to the outside of the diaphragm pump 12, and the amount of dialysate supplied can be precisely controlled.

The dialysis cassette 10 and the diaphragm pump 12 of the present embodiment have the following effects.

The dialysis cassette 10 of the present embodiment is a flow path for switching between a diaphragm pump 12 (pump) for sending dialysate, a heating tube 14 for heating dialysate, and a flow path to which the diaphragm pump 12 is connected. The present invention relates to a dialysis cassette 10 having a switching unit 16. The diaphragm pump 12 of the dialysis cassette 10 includes a pump body 20 having a concave pump chamber 32, a pump membrane 24 covering the pump chamber 32, and a pump lid 28 having a pressing portion 52 for pressing the peripheral edge of the pump membrane 24. The first seal portion 42, which is in contact with the pump membrane 24 and sandwiches the pump membrane 24 between the pressing portion 52 and seals the space under the pump membrane 24 of the pump chamber 32 in a liquid-tight manner, and the pump body. A second seal portion 62 having an annular protrusion 44 projecting from 20 toward the pump lid 28 and an annular rib structure 60 projecting from the pump lid 28 and airtightly fitting with the annular protrusion 44 is provided.

According to the above-mentioned dialysis cassette 10, the material cost and the O-ring are not required for the second seal portion 62 that airtightly seals the space above the pump chamber 32 partitioned by the pump membrane 24. The step of mounting the 22 becomes unnecessary, and the manufacturing cost is suppressed.

In the above dialysis cassette 10, the second seal portion 62 may be provided on the outer peripheral side of the first seal portion 42. According to this configuration, since the pump membrane 24 does not bite into the second seal portion 62, it becomes easy to secure the sealability of the second seal portion 62.

In the above-mentioned dialysis cassette 10, the annular rib structure 60 of the pump lid 28 has an inner peripheral rib 56 that abuts on the inner peripheral side of the annular protrusion 44 and presses the annular protrusion 44 toward the outer peripheral side, and the annular protrusion 44. An outer peripheral rib 58 that abuts on the outer peripheral side of the surface and receives the load of the annular protrusion 44 that is pressed toward the outer peripheral side may be provided. According to this configuration, the sealing property of the second sealing portion 62 can be exhibited with a simple configuration without using parts such as the O-ring 22, and the manufacturing cost can be suppressed.

In the above-mentioned dialysis cassette 10, the outer diameter of the inner peripheral rib 56 may be formed to be larger than the inner diameter of the annular protrusion 44. According to this configuration, the annular protrusion 44 is reliably pressed by the inner peripheral rib 56, and the airtightness of the second seal portion 62 is improved.

In the above-mentioned dialysis cassette 10, the protruding height of the inner peripheral rib 56 may be higher than the protruding height of the outer peripheral rib 58.

In the above-mentioned dialysis cassette 10, the diaphragm pump 12 may be arranged between the pump membrane 24 and the pressing portion 52, and may include a membrane ring 26 for preventing the pump membrane 24 from bending, and the pressing portion 52 may include a membrane ring. The pump membrane 24 may be configured to be pressed toward the first seal portion 42 via the 26. According to this configuration, the occurrence of wrinkles on the pump membrane 24 can be prevented, and the deterioration of the sealing property due to the wrinkles can be prevented.

In the above-mentioned dialysis cassette 10, the pump lid 28 may be screwed into the pump body 20 by a screw structure 50 provided on the outer peripheral side of the pump body 20. As a result, the pump lid 28 is securely fixed to the pump body 20 with a simple configuration, and the manufacturing cost is suppressed.

In the present embodiment, the diaphragm pump 12 that sends the dialysate, the heating tube 14 that heats the dialysate, and the flow path switching unit 16 that switches the flow path to which the diaphragm pump 12 is connected are integrated. The diaphragm pump 12 (pump) of the dialysis cassette 10 formed in the above, presses the pump body 20 having a concave pump chamber 32, the pump membrane 24 covering the pump chamber 32, and the peripheral edge of the pump membrane 24. The pump film 24 is sandwiched between the pump lid 28 having the pressing portion 52 and the pressing portion 52 in contact with the pump film 24, and the space under the pump film 24 of the pump chamber 32 is liquid-tightly sealed. A second having a first seal portion 42, an annular protrusion 44 protruding from the pump body 20 toward the pump lid 28, and an annular rib structure 60 protruding from the pump lid 28 and tightly fitting with the annular protrusion 44. A seal portion 62 is provided.

According to the diaphragm pump 12 (pump) described above, the O-ring 22 is not required for the second seal portion 62 that airtightly seals the space above the pump chamber 32 partitioned by the pump membrane 24, so that the material cost and the material cost and The step of mounting the O-ring 22 becomes unnecessary, and the manufacturing cost is suppressed.

Although the present invention has been described above with reference to preferred embodiments, it goes without saying that the present invention is not limited to the above embodiments and various modifications can be made without departing from the spirit of the present invention. stomach.

10 ... Dialysis cassette 14 ... Heating tube 16 ... Flow path switching part 20 ... Pump body 24 ... Pump membrane 26 ... Membrane ring 28 ... Pump lid 28a ... Through hole 32 ... Pump chamber 38 ... Outer circumference 42 ... First seal 44 ... annular protrusion 50 ... screw structure 52 ... pressing portion 56 ... inner peripheral rib 58 ... outer peripheral rib 60 ... annular rib structure 62 ... second seal portion

Claims (8)

A dialysate cassette having a pump for sending dialysate, a heating tube for heating dialysate, and a flow path switching unit for switching the flow path to which the pump is connected.
The pump
A pump body with a concave pump chamber and
The pump membrane covering the pump chamber and
A pump lid having a pressing portion for pressing the peripheral portion of the pump membrane, and a pump lid.
A first seal portion that comes into contact with the pump membrane, sandwiches the pump membrane between the pressing portion, and seals the space under the pump membrane of the pump chamber in a liquid-tight manner.
Dialysis provided with a second seal portion having an annular protrusion projecting from the pump body toward the pump lid and an annular rib structure projecting from the pump lid and airtightly fitting the annular protrusion. Cassette for. The dialysis cassette according to claim 1, wherein the second seal portion is provided on the outer peripheral side of the first seal portion. The dialysis cassette according to claim 2, wherein the annular rib structure of the pump lid includes an inner rib that abuts on the inner peripheral side of the annular protrusion and presses the annular protrusion toward the outer peripheral side. A dialysis cassette comprising an outer peripheral rib that abuts on the outer peripheral side of the annular protrusion and receives a load of the annular protrusion that is pressed toward the outer peripheral side. The dialysis cassette according to claim 3, wherein the outer diameter of the inner peripheral rib is formed to be larger than the inner diameter of the annular protrusion. The dialysis cassette according to claim 4, wherein the protruding height of the inner peripheral rib is higher than the protruding height of the outer peripheral rib. The dialysis cassette according to any one of claims 1 to 5, wherein the pump is arranged between the pump membrane and the pressing portion, and includes a membrane ring that prevents the pump membrane from bending. , The pressing portion is a dialysis cassette that presses the pump membrane toward the first sealing portion via the membrane ring. The dialysis cassette according to any one of claims 1 to 6, wherein the pump lid is screwed into the pump body by a screw structure provided on the outer peripheral side of the pump body. cassette. A dialysis cassette pump in which a pump for sending dialysate, a heating tube for heating dialysate, and a flow path switching section for switching the flow path to which the pump is connected are integrally formed. There,
A pump body with a concave pump chamber and
The pump membrane covering the pump chamber and
A pump lid having a pressing portion for pressing the peripheral portion of the pump membrane, and a pump lid.
A first seal portion that comes into contact with the pump membrane, sandwiches the pump membrane between the pressing portion, and seals the space under the pump membrane of the pump chamber in a liquid-tight manner.
A pump including an annular protrusion projecting from the pump body toward the pump lid and a second seal portion having an annular rib structure projecting from the pump lid and airtightly fitting with the annular protrusion. ..

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