Medical liquid feeder, medical cassette and medical liquid feeding system

Abstract

To provide a medical liquid feeder capable of preventing overheated dialysate solution from being delivered to a user.SOLUTION: A medical liquid feeder 12 of a medical liquid feeding system 10 includes: a determination part 90 for determining whether or not temperature Tw of liquid heated by a heater part 76 is higher than predetermined first temperature threshold T1; and a control part 92 controlling a pump driving part 72 and a heater part 76. When the determination part 90 determines that temperature Tw of liquid heated by the heater part 76 is higher than first temperature threshold T1, the control part 92 performs stop control to stop delivering the liquid to user U and stop heating liquid and cooling control to cool the liquid by using the storage part 36 to flow the liquid in a medical cassette 14.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a medical fluid delivery device, a medical cassette, and a medical fluid delivery system. [Background technology]

[0002] A peritoneal dialysis system, such as that disclosed in Patent Document 1, is known as a medical fluid delivery system. The peritoneal dialysis system automatically delivers dialysate (infusion) into the peritoneal cavity of a user (patient) and delivers dialysate (drainage) from the user's peritoneal cavity to a drainage container. The peritoneal dialysis system comprises a dialysis device main body having a housing and a dialysis cassette detachable from the dialysis device main body. The dialysis cassette is a fluid circuit component equipped with a pump function and a valve function. The dialysis cassette attached to the device main body delivers dialysate (infusion) from the dialysis solution bag to the user's peritoneal cavity and transfers dialysate (drainage) from the user's peritoneal cavity to a drainage bag. To reduce discomfort experienced by the user when delivering dialysate to the user's peritoneal cavity, the dialysis cassette further includes a heater for heating the dialysis solution. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-182254 Summary of the Invention [Problem to be solved by the invention]

[0004] If the temperature of the dialysis fluid heated by the heater is too high, the user may feel uncomfortable due to the temperature of the dialysis fluid. Similar issues exist in other medical fluid delivery systems that deliver fluid to the user.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] (1) A first aspect of the present invention is a medical fluid delivery device that includes a cassette mounting portion to which a medical cassette can be attached and detached, aspirates liquid from a liquid container into the medical cassette, and delivers the liquid to a user, and includes a pump drive unit that operates a pump unit for delivering liquid provided in the medical cassette, a heater unit that selectively heats the liquid located in a heating unit provided in the medical cassette, a temperature acquisition unit that acquires information about the temperature of the liquid, a determination unit that determines whether the temperature of the liquid heated by the heater unit is higher than a predetermined first temperature threshold, and a control unit that controls the pump drive unit and the heater unit, When the determination unit determines that the temperature of the liquid heated by the heater unit is below the first temperature threshold, the control unit executes liquid delivery control to deliver the liquid heated by the heater unit to the user without passing through a storage unit provided in the medical cassette, and when the determination unit determines that the temperature of the liquid heated by the heater unit is higher than the first temperature threshold, the control unit executes stop control to stop the delivery of the liquid to the user and stop heating the liquid, and cooling control to cool the liquid by circulating the liquid within the medical cassette using the storage unit.

[0007] This prevents excessively heated dialysis fluid from being delivered to the user, thereby preventing the user from feeling uncomfortable due to the temperature of the dialysis fluid.

[0008] (2) In the medical fluid delivery device described in (1) above, the judgment unit judges whether the temperature of the liquid cooled by the cooling control is equal to or lower than a predetermined second temperature threshold, and if the judgment unit judges that the temperature of the liquid cooled by the cooling control is equal to or lower than the second temperature threshold, the control unit may terminate the cooling control and resume the fluid delivery control, and if the judgment unit judges that the temperature of the liquid cooled by the cooling control is higher than the second temperature threshold, the control unit may continue the cooling control.

[0009] As a result, fluid delivery control is resumed after the dialysis fluid has been cooled to a temperature equal to or lower than the second temperature threshold, thereby effectively preventing overheated dialysis fluid from being delivered to the user.

[0010] (3) In the medical fluid delivery device described in (1) above, the cooling control may include a first transfer control for transferring the liquid heated by the heater section to the storage section, and a second transfer control for transferring the liquid from the storage section to the pump section.

[0011] As a result, the dialysis fluid is cooled by the reservoir, and the dialysis fluid flowing into the pump section mixes with the dialysis fluid remaining in the pump section, thereby cooling the dialysis fluid, thereby enabling the dialysis fluid to be cooled effectively.

[0012] (4) In the medical fluid delivery device described in (3) above, in the second transfer control, the control unit may transfer the liquid from the storage unit to the pump unit via a relay line provided in the medical cassette without passing through the heating unit.

[0013] This allows the dialysis fluid to be efficiently transferred from the reservoir to the pump.

[0014] (5) In the medical fluid delivery device described in (3) or (4) above, the cooling control further includes a third transfer control that transfers the liquid from the pump unit to the storage unit via the heating unit after the second transfer control, and the judgment unit determines whether the temperature of the liquid cooled by the cooling control is equal to or lower than a predetermined second temperature threshold.If the judgment unit determines that the temperature of the liquid cooled by the cooling control is equal to or lower than the second temperature threshold, the control unit may terminate the cooling control and resume the fluid delivery control.If the judgment unit determines that the temperature of the liquid cooled by the cooling control is higher than the second temperature threshold, the control unit may repeat the second transfer control and the third transfer control until the temperature of the liquid becomes equal to or lower than the second temperature threshold.

[0015] This effectively prevents excessively heated dialysis fluid from being delivered to the user.

[0016] (6) In the medical fluid delivery device described in (5) above, the determination unit may determine whether the temperature of the liquid flowing out of the pump unit and transferred to the heating unit by the third transfer control is below the second temperature threshold.

[0017] This makes it possible to appropriately determine whether or not the cooling control needs to be continued based on the temperature of the dialysis fluid immediately after it has flowed out of the pump section.

[0018] (7) In the medical fluid delivery device described in (5) or (6) above, the control unit may execute discharge control to discharge the liquid from the storage unit to the pump unit after the cooling control ends and before resuming the fluid delivery control.

[0019] By executing the discharge control, the reservoir can be kept empty in preparation for the next cooling control.

[0020] (8) In the medical fluid delivery device described in (1) above, the control unit may execute a refill control to introduce the liquid from the liquid container to the pump unit between the stop control and the cooling control.

[0021] By executing the refill control, the amount of unheated dialysis fluid in the dialysis cassette can be increased, thereby enhancing the cooling effect of the dialysis fluid by the cooling control.

[0022] (9) A second aspect of the present invention is a medical cassette that is detachable from a medical fluid delivery device, aspirates liquid from a liquid container, and delivers the liquid toward a user, comprising: an inlet port for introducing the liquid from the liquid container into the medical cassette; a pump unit that delivers the liquid by aspirating and discharging the liquid; a valve mechanism including a plurality of valve units that switches the fluid delivery path within the medical cassette; a heating unit that receives the liquid from the pump unit and has a heating flow path formed therein for heating the liquid; a user-side port for delivering the heated liquid toward the user; and a storage unit that can temporarily store the heated liquid, wherein the fluid delivery path within the medical cassette can be selectively switched by the valve mechanism between a path state in which the heated liquid can be delivered to the user without passing through the storage unit, and a path state in which the liquid can be cooled by flowing the liquid within the medical cassette using the storage unit.

[0023] With this configuration, by allowing the dialysis fluid to flow within the medical cassette while the heating of the dialysis fluid in the heating section is stopped, it is possible to prevent overheated dialysis fluid from being sent to the user.

[0024] (10) The medical cassette described in (9) above may be provided with a user side line which is a flow path connecting the heating section and the user side port, and a storage line which is a flow path connecting the user side line and the storage section.

[0025] With this configuration, the dialysis fluid can be transferred from the heating section to the reservoir section, and the reservoir section can be used to effectively cool the dialysis fluid.

[0026] (11) In the medical cassette described in (10) above, the valve mechanism may have a user-side valve provided on the flow path between the branch point of the storage line from the user-side line and the user-side port, and a storage valve provided on the storage line.

[0027] According to this configuration, by closing the user-side valve and opening the reservoir valve, a path state can be formed that allows the dialysis fluid to be transported to the reservoir.

[0028] (12) The medical cassette described in (9) or (10) above may have a relay line which is a flow path for transporting the liquid from the storage section to the pump section without passing through the heating section.

[0029] With this configuration, the dialysis fluid can be efficiently transferred from the reservoir to the pump.

[0030] (13) In the medical cassette described in (12) above, the valve mechanism may have a relay valve provided on the relay line.

[0031] According to this configuration, by opening the relay valve, a path state can be formed in which the dialysis fluid can be transported from the reservoir to the pump.

[0032] (14) A third aspect of the present invention is a medical fluid delivery system comprising a medical fluid delivery device having a cassette mounting portion and a medical cassette detachable from the cassette mounting portion of the medical fluid delivery device, which aspirates a liquid from a liquid container into the medical cassette and delivers the liquid toward a user, wherein the medical cassette has an introduction port for introducing the liquid from the liquid container into the medical cassette, a pump unit for delivering the liquid by aspirating and discharging the liquid, a heating unit which receives the liquid from the pump unit and has a heating flow path formed therein for heating the liquid, a user-side port for delivering the heated liquid toward the user, and a storage unit which can temporarily store the heated liquid, and the medical fluid delivery device has a pump drive unit which operates the pump unit of the medical cassette, and a pump drive unit which selectively heats the liquid located in the heating unit of the medical cassette. a temperature acquisition unit that acquires information about the temperature of the liquid; a determination unit that determines whether the temperature of the liquid heated by the heater unit is higher than a predetermined first temperature threshold; and a control unit that controls the pump drive unit and the heater unit. When the determination unit determines that the temperature of the liquid heated by the heater unit is equal to or lower than the first temperature threshold, the control unit executes liquid delivery control to deliver the liquid heated by the heater unit to the user without passing through the storage unit. When the determination unit determines that the temperature of the liquid heated by the heater unit is higher than the first temperature threshold, the control unit executes stop control to stop the delivery of the liquid to the user and stop heating the liquid, and cooling control to cool the liquid by using the storage unit to flow the liquid within the medical cassette. [Effects of the Invention]

[0033] According to the present invention, excessively heated dialysis fluid is prevented from being delivered to the user, thereby preventing the user from feeling uncomfortable due to the temperature of the dialysis fluid. [Brief explanation of the drawings]

[0034] [Figure 1] FIG. 1 is a perspective view of a medical fluid delivery system according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view showing a specific configuration of the medical cassette. [Figure 3] FIG. 3 is a plan view of the front side of the medical cassette. [Figure 4] FIG. 4 is a plan view of the back side of the medical cassette. [Figure 5] FIG. 5 is a cross-sectional view of a storage portion provided in a medical cassette. [Figure 6] FIG. 6 is a schematic diagram of a medical fluid delivery system. [Figure 7] FIG. 7 is a flowchart of the liquid injection operation of the medical liquid delivery system. [Figure 8] FIG. 8 is a schematic diagram of the medical fluid delivery system during stop control. [Figure 9] FIG. 9 is a schematic diagram of the medical fluid delivery system during replenishment control. [Figure 10] FIG. 10 is a schematic diagram of the medical fluid delivery system during the first transfer control and the third transfer control. [Figure 11] FIG. 11 is a schematic diagram of the medical fluid delivery system during the second transfer control and discharge control. DETAILED DESCRIPTION OF THE INVENTION

[0035] The medical fluid delivery system 10 shown in Fig. 1 includes a medical fluid delivery device 12 and a medical cassette 14. The medical fluid delivery system 10 draws liquid from a liquid container 16 into the medical cassette 14 and delivers the liquid to a patient, i.e., a user U (Fig. 3, etc.). In this embodiment, the medical fluid delivery system 10 is an automated peritoneal dialysis system 11.

[0036] The automated peritoneal dialysis system 11 includes a dialysis device main body 13 and a dialysis cassette 15. The dialysis device main body 13 is one embodiment of the medical fluid delivery device 12. The dialysis cassette 15 is one embodiment of the medical cassette 14. The liquid delivered by the automated peritoneal dialysis system 11 is a dialysis fluid. The automated peritoneal dialysis system 11 has the function of automatically delivering (injecting) the dialysis fluid from a dialysis fluid bag 17 to the peritoneal cavity of a user U, and delivering (draining) the dialysis fluid from the peritoneal cavity of the user U to a drainage container 19 (see FIG. 3, etc.). The following will first describe the configuration of the dialysis cassette 15.

[0037] The dialysis cassette 15 includes a cassette body 20. The cassette body 20 is detachable from the dialysis device body 13.

[0038] 2, the cassette body 20 has a base member 22 and a plurality of flexible sheets 24. The base member 22 is a plate-like member made of a resin material. The base member 22 has a substantially rectangular shape. Examples of the resin material that makes up the base member 22 include hard resins such as polypropylene, polyethylene, and polycarbonate.

[0039] The base member 22 has a front surface and a back surface. The front surface of the base member 22 is one surface in the thickness direction of the base member 22. The front surface of the base member 22 is the surface facing upward in FIG. 2. The back surface is the other surface in the thickness direction of the base member 22. The back surface of the base member 22 is the surface facing downward in FIG. 2.

[0040] The multiple flexible sheets 24 are fixed to the base member 22. The multiple flexible sheets 24 include a first sheet 24a, a second sheet 24b, and a third sheet 24c. The first sheet 24a, the second sheet 24b, and the third sheet 24c are attached to the base member 22 in a liquid-tight manner. The first sheet 24a and the second sheet 24b are fixed to the front surface of the base member 22. The third sheet 24c is fixed to the back surface of the base member 22.

[0041] As shown in Figure 6, the cassette body 20 has an internal flow path 21, multiple introduction ports 26, a user side port 28, a drainage port 30, a pump section 32, a heating section 34, a storage section 36, and a valve mechanism 38.

[0042] The internal flow path 21 of the cassette body 20 is a fluid circuit for flowing the dialysis fluid. The internal flow path 21 has an inlet line 40, a first pump line 41, a second pump line 42, a heated inlet line 44, a user side line 46, a relay line 48, a drain line 50, and a storage line 52. These lines are formed by covering multiple grooves formed on the front and back surfaces of the base member 22 with multiple flexible sheets 24 (see FIG. 2).

[0043] Below, the introduction line 40, the first pump line 41, the second pump line 42, the heated introduction line 44, the user side line 46, the relay line 48, the drainage line 50 and the storage line 52 will be described mainly with reference to Figure 6.

[0044] The inlet line 40 is a flow path leading from the multiple inlet ports 26 to the pump section 32. The first pump line 41 is a flow path connecting the inlet line 40 and the pump section 32. Most of the first pump line 41 is formed on the back surface of the base member 22 (see FIG. 4). Part of the first pump line 41 is formed on the front surface of the base member 22. The second pump line 42 is a flow path connecting the pump section 32 and the heating inlet line 44, and also connecting the pump section 32 and the drainage line 50. Most of the second pump line 42 is formed on the back surface of the base member 22 (see FIG. 4). Part of the second pump line 42 is formed on the front surface of the base member 22.

[0045] The heating introduction line 44 is a flow path that connects the second pump line 42 and the heating unit 34. Most of the heating introduction line 44 is formed on the back surface of the base member 22 (see FIG. 4). Part of the heating introduction line 44 is formed on the front surface of the base member 22. The user side line 46 is a flow path that connects the heating unit 34 and the user side port 28. Most of the user side line 46 is formed on the back surface of the base member 22 (see FIG. 4). Part of the user side line 46 is formed on the front surface of the base member 22.

[0046] The relay line 48 is a flow path connecting the user side line 46 and the second pump line 42. The relay line 48 is a flow path for transporting dialysis fluid from the user U to the pump unit 32. The relay line 48 is also a flow path for transporting liquid from the storage unit 36 ​​to the pump unit 32 without passing through the heating unit 34. Most of the relay line 48 is formed on the back surface of the base member 22 (see FIG. 4). Part of the relay line 48 is formed on the back surface of the base member 22. The drain line 50 is a flow path connecting the second pump line 42 and the drain port 30. Most of the drain line 50 is formed on the back surface of the base member 22 (see FIG. 4). Part of the drain line 50 is formed on the back surface of the base member 22.

[0047] The storage line 52 is a flow path that connects the user-side line 46 and the storage section 36. Most of the storage line 52 is formed on the back surface of the base member 22 (see FIG. 4). A part of the storage line 52 is formed on the front surface of the base member 22.

[0048] The multiple introduction ports 26 are ports for introducing the dialysis fluid supplied from the dialysis fluid bag 17 into the internal flow path 21 of the cassette body 20. The dialysis fluid bag 17 is one embodiment of the liquid container 16. Only one introduction port 26 may be provided. The user side port 28 is a port for causing the dialysis fluid to flow out from the internal flow path 21 of the cassette body 20 toward the user U. The user side port 28 is also a port for introducing the dialysis fluid (dialysis fluid containing waste products, etc.) discharged from the abdominal cavity of the user U into the internal flow path 21 of the cassette body 20. The drainage port 30 is a port for causing the dialysis fluid to flow out from the internal flow path 21 of the cassette body 20 toward the drainage container 19.

[0049] The dialysis cassette 15 further includes an infusion tube 54, a user-side tube 56, and a drainage tube 58. The multiple introduction ports 26 are connected to multiple dialysis solution bags 17 via the infusion tube 54. The user-side port 28 is connected to the abdomen of the user U via the user-side tube 56. The drainage port 30 is connected to a drainage container 19 via the drainage tube 58.

[0050] The pump unit 32 is a positive displacement pump that pumps the dialysis fluid by drawing in and discharging the dialysis fluid. More specifically, the pump unit 32 is a diaphragm pump. In this embodiment, one pump unit 32 is provided. Two or more pump units 32 may be provided.

[0051] As shown in FIG. 2, the pump section 32 has a pump recess 320, a pump membrane section 322, and a pump chamber 324. The pump recess 320 is a recess provided in the surface of the base member 22. The pump recess 320 is a recess provided in the surface of the base member 22. The pump membrane section 322 is a portion of the first sheet 24a that faces the pump recess 320. A first communication hole 326 and a second communication hole 327 are formed in the pump recess 320 (see FIG. 3). In the initial state of the cassette body 20, the pump membrane section 322 is recessed toward the pump recess 320. The pump chamber 324 is a chamber for storing dialysis fluid. The pump chamber 324 is a chamber formed by being surrounded by the pump recess 320 and the pump membrane section 322.

[0052] When the pump membrane 322 is pulled away from the pump recess 320, the dialysate is drawn into the pump chamber 324. When the pump membrane 322 is pushed toward the pump recess 320, the dialysate is discharged from the pump chamber 324.

[0053] As shown in FIG. 2, the heating unit 34 has a heating flow path 35 for heating the dialysis fluid. Specifically, the heating unit 34 has a first heating flow path 35a and a second heating flow path 35b. The first heating flow path 35a constitutes a part of the internal flow path 21. The first heating flow path 35a is formed by covering a groove provided on the back surface of the base member 22 with a third sheet 24c. The second heating flow path 35b constitutes a part of the internal flow path 21. The second heating flow path 35b is formed by covering a groove provided on the front surface of the base member 22 with the second sheet 24b. The first heating flow path 35a and the second heating flow path 35b communicate with each other via a through-hole 220 that penetrates the base member 22 in the thickness direction. Each of the first heating flow path 35a and the second heating flow path 35b is formed in a spiral shape. Each of the first heating flow path 35a and the second heating flow path 35b may be formed in a serpentine shape.

[0054] As shown in FIG. 5, the storage section 36 has a storage recess 360, a storage membrane section 362, and a storage chamber 364. The storage recess 360 is a depression provided in the surface of the base member 22. The storage membrane section 362 is a portion of the first sheet 24a that faces the storage recess 360. In the initial state of the cassette body 20, the storage membrane section 362 has a curved shape that follows the storage recess 360. Therefore, in the initial state of the cassette body 20, the outer surface of the storage membrane section 362, which is the surface opposite to the surface facing the storage recess 360, is recessed toward the storage recess 360.

[0055] The storage membrane portion 362 is flexible. Therefore, the storage membrane portion 362 deforms as the dialysate flows into and out of the storage chamber 364. The storage chamber 364 is a chamber for storing the dialysate. The storage chamber 364 is a chamber formed by being surrounded by the storage recess 360 and the storage membrane portion 362.

[0056] 3, the volume of the storage section 36 is smaller than the volume of the heating section 34. The volume of the storage section 36 is the size of the internal space when the internal space (storage chamber 364) of the storage section 36 is at its maximum. The volume of the storage section 36 may be the same as the volume of the heating section 34. The volume of the storage section 36 may be larger than the volume of the heating section 34.

[0057] The valve mechanism 38 switches the liquid transfer path within the cassette body 20. The valve mechanism 38 has a plurality of valve units 60. As shown in FIG. 6, the valve mechanism 38 has, as the plurality of valve units 60, a plurality of introduction valves 60a, a first pump valve 60b, a second pump valve 60c, a heating inlet valve 60d, a heating outlet valve 60e, a user-side valve 60f, a relay valve 60g, a drainage valve 60h, and a storage valve 60i.

[0058] The introduction valves 60a are provided on the introduction line 40. The introduction valves 60a are provided adjacent to the introduction ports 26. As shown in FIG. 3, each introduction valve 60a has a valve recess 600, a valve membrane portion 602, a valve chamber 604, and a valve port 606. The valve recess 600 is a depression provided in the surface of the base member 22. The valve membrane portion 602 is a portion of the first sheet 24a facing the valve recess 600. The valve membrane portion 602 of each of the introduction valves 60a, the first pump valve 60b, the second pump valve 60c, the heated inlet valve 60d, the heated outlet valve 60e, the user-side valve 60f, the relay valve 60g, and the drainage valve 60h is displaced by a valve driver 74 (see FIG. 6) of the dialysis machine main body 13. The valve driver 74 will be described later.

[0059] As shown in Fig. 3, the valve chamber 604 is a room formed by being surrounded by the valve recess 600 and the valve membrane portion 602. The introduction port 26 is in communication with the valve chamber 604. The valve port 606 is a hollow cylinder having a port hole 607. The valve port 606 protrudes from the bottom of the valve recess 600. The height of the valve port 606 from the bottom of the valve recess 600 is lower than the height of the side wall of the valve recess 600. The port hole 607 penetrates the base member 22 in the thickness direction.

[0060] When the valve membrane portion 602 abuts against the tip of the valve port 606, the porthole 607 is closed. In other words, the introduction valve 60a is closed. When the valve membrane portion 602 moves away from the tip of the valve port 606, the porthole 607 is opened. In other words, the introduction valve 60a is opened. When the porthole 607 is open, the porthole 607 communicates between the valve chamber 604 and the portion of the introduction line 40 that is provided on the back surface of the base member 22. The user-side valve 60f and the drain valve 60h are configured in the same manner as the introduction valve 60a.

[0061] As shown in FIG. 6, the first pump valve 60b is provided on the first pump line 41. The first pump valve 60b is adjacent to the pump section 32. As shown in FIG. 3, the first pump valve 60b has a valve recess 600, a valve membrane section 602, a valve chamber 604, and a valve port 606, similar to the introduction valve 60a. The first pump valve 60b further has a through-hole 608. The through-hole 608 penetrates the base member 22 in the thickness direction. The second pump valve 60c, the heated inlet valve 60d, the heated outlet valve 60e, the relay valve 60g, and the storage valve 60i are also configured similarly to the first pump valve 60b.

[0062] As shown in Figure 6, the second pump valve 60c is provided on the second pump line 42. The second pump valve 60c is adjacent to the pump section 32. The heating inlet valve 60d is provided on the heating introduction line 44. The heating inlet valve 60d is adjacent to the inlet of the heating section 34. The heating outlet valve 60e is provided on the user side line 46. The heating outlet valve 60e is adjacent to the outlet of the heating section 34.

[0063] 3, in the first pump valve 60b, the through-hole 608 communicates the valve chamber 604 with a portion of the first pump line 41 that is provided on the back surface of the base member 22. Similarly, in the second pump valve 60c, the through-hole 608 communicates the valve chamber 604 with a portion of the second pump line 42 that is provided on the back surface of the base member 22. In the heating inlet valve 60d, the through-hole 608 communicates the valve chamber 604 with a portion of the heating introduction line 44 that is provided on the back surface of the base member 22. In the heating outlet valve 60e, the through-hole 608 communicates the valve chamber 604 with a portion of the user-side line 46 that is provided on the back surface of the base member 22.

[0064] As shown in FIG. 6 , the user-side valve 60f is provided on the user-side line 46. The user-side valve 60f is adjacent to the user-side port 28. The user-side valve 60f is provided on the flow path between the user-side port 28 and a branch point P1 of the storage line 52 from the user-side line 46. The drain valve 60h is provided on the drain line 50. The drain valve 60h is adjacent to the drain port 30. The storage valve 60i is provided on the storage line 52.

[0065] The fluid delivery path within the medical cassette 14 can be selectively switched between multiple path states by the valve mechanism 38. The multiple path states include at least a first path state and a second path state. The first path state is a path state in which the heated dialysis fluid can be delivered to the user U without passing through the reservoir 36. The second path state is a path state in which the dialysis fluid can be cooled by flowing the dialysis fluid within the medical cassette 14 using the reservoir 36.

[0066] 1, the dialysis device main body 13 includes a cassette mounting section 64. The cassette mounting section 64 has a slot 66 and a cover member 65. The slot 66 is capable of accommodating a dialysis cassette 15. The cover member 65 is capable of opening and closing an opening 67 of the slot 66.

[0067] A start button 68 and a stop button 69 are provided on the front surface of the dialysis machine main body 13. The start button 68 is a button for instructing the dialysis machine main body 13 to start operating. The stop button 69 is a button for instructing the dialysis machine main body 13 to stop operating. A touch panel 70 that functions as a display unit and an input unit is also provided on the front surface of the dialysis machine main body 13.

[0068] As shown in FIG. 6, the dialysis device main body 13 further includes a pump driving unit 72, a valve driving unit 74, a heater unit 76, a first temperature sensor 78, a second temperature sensor 80, and a control device 82.

[0069] The pump driver 72 can pull or press the pump membrane 322 of the first sheet 24a. The pump driver 72 can be a pneumatic type that displaces the pump membrane 322 using air pressure. The pump driver 72 can draw dialysis fluid into the pump section 32, for example, by applying negative pressure to the pump membrane 322 of the first sheet 24a and pulling the pump membrane 322 in a direction away from the base member 22. The pump driver 72 can discharge dialysis fluid from the pump section 32 by applying positive pressure to the pump membrane 322 of the first sheet 24a and pushing the pump membrane 322 toward the base member 22. Note that the pump driver 72 is not limited to a pneumatic type and may be, for example, a driver using an actuator having a displacement portion that is mechanically displaced.

[0070] The valve drive unit 74 has a plurality of pressing portions for opening and closing the plurality of valve units 60. The plurality of pressing portions may be movable portions that are displaceable in the thickness direction of the cassette body 20. The plurality of pressing portions can press the valve membrane portions 602 of the first sheet 24a toward the plurality of valve ports 606 (see FIG. 3), respectively. The valve drive unit 74 can selectively close the plurality of valve units 60 (the plurality of valve ports 606). The pump drive unit 72 can switch the liquid delivery path within the cassette body 20 by selecting the open / closed state of the plurality of valve units 60 using the plurality of pressing portions.

[0071] The heater unit 76 selectively heats the liquid located in the heating unit 34. The heater unit 76 heats the liquid located in the heating unit 34, for example, to 36.0°C to 38.0°C. The heater unit 76 may have, for example, a first heater and a second heater that face each other. When the cassette body 20 is inserted (mounted) in the slot 66 of the dialysis device body 13, the first heater faces the first heating flow path 35a (FIG. 4), and the second heater faces the second heating flow path 35b (FIG. 3).

[0072] In FIG. 6, the first temperature sensor 78 detects the temperature Tw of the dialysate located in the internal flow path 21 of the dialysis cassette 15. The first temperature sensor 78 is disposed at a position in the user-side line 46 where it can detect the temperature Tw of the dialysate located near the outlet of the heating unit 34 (see also FIG. 4). In this case, the position where the first temperature sensor 78 measures the temperature of the dialysate may be, for example, between the heating unit 34 and the heating outlet valve 60e. As shown in FIG. 3, the position where the first temperature sensor 78 measures the temperature of the dialysate may be inside the heating unit 34. In this case, the first temperature sensor 78 may be disposed at a position where it can detect the temperature Tw of the dialysate located near the outlet of the heating unit 34 within the heating unit 34. In this case, a cutout is formed by cutting out a part of the heater unit 76. The first temperature sensor 78 is disposed in this cutout.

[0073] 6, the second temperature sensor 80 detects the temperature Tw of the dialysate located in the internal flow path 21 of the dialysis cassette 15. The second temperature sensor 80 is disposed at a position in the heating introduction line 44 where it can detect the temperature Tw of the dialysate located near the inlet of the heating unit 34 (see also FIG. 4). In this case, the position where the second temperature sensor 80 measures the temperature of the dialysate may be, for example, between the heating unit 34 and the heating inlet valve 60d.

[0074] The first temperature sensor 78 and the second temperature sensor 80 are, for example, non-contact temperature sensors. An example of a non-contact temperature sensor is an optical temperature sensor. The first temperature sensor 78 and the second temperature sensor 80 may be contact temperature sensors. Examples of contact temperature sensors include a resistance temperature sensor, a thermocouple, and a bimetal.

[0075] The control device 82 has a calculation unit 84 and a storage unit 86. The calculation unit 84 is configured by a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit), that is, a processing circuitry.

[0076] The calculation unit 84 has a temperature acquisition unit 88, a determination unit 90, and a control unit 92. The temperature acquisition unit 88, the determination unit 90, and the control unit 92 can be realized by the calculation unit 84 executing a program stored in the storage unit 86.

[0077] At least a part of the temperature acquisition unit 88, the determination unit 90, and the control unit 92 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array).Furthermore, at least a part of the temperature acquisition unit 88, the determination unit 90, and the control unit 92 may be configured by an electronic circuit including discrete devices.

[0078] The storage unit 86 is composed of a volatile memory (not shown) and a non-volatile memory (not shown). An example of the volatile memory is a random access memory (RAM). The volatile memory is used as a working memory for the processor, and temporarily stores data necessary for processing or calculation. An example of the non-volatile memory is a read-only memory (ROM) or a flash memory. The non-volatile memory is used as a storage memory, and stores programs, tables, maps, etc. At least a part of the storage unit 86 may be provided in the processor, integrated circuit, etc. described above.

[0079] The temperature acquisition unit 88 acquires information about the temperature Tw of the dialysis fluid. Specifically, the temperature acquisition unit 88 acquires information about the temperature Tw of the dialysis fluid detected by the first temperature sensor 78. The temperature acquisition unit 88 acquires information about the temperature Tw of the dialysis fluid detected by the second temperature sensor 80.

[0080] The determination unit 90 makes a determination regarding the temperature Tw of the dialysis fluid using information regarding the temperature Tw of the dialysis fluid acquired by the temperature acquisition unit 88. The determination unit 90 determines whether the temperature Tw of the dialysis fluid heated by the heater unit 76 is higher than a predetermined first temperature threshold T1. The first temperature threshold T1 is determined in advance and stored in the storage unit 86. The first temperature threshold T1 is set to a temperature at which the user U may feel uncomfortable due to the dialysis fluid injected into the abdominal cavity of the user U. The first temperature threshold T1 is set to, for example, 38.0°C to 42.0°C.

[0081] The determination unit 90 determines whether the temperature Tw of the dialysis fluid cooled by the cooling control described below is equal to or lower than a predetermined second temperature threshold T2. The second temperature threshold T2 is determined in advance and stored in the storage unit 86. The second temperature threshold T2 is lower than the first temperature threshold T1. The second temperature threshold T2 is set to, for example, 32.0°C to 34.0°C.

[0082] The control unit 92 controls the pump drive unit 72, the valve drive unit 74, and the heater unit 76. The control unit 92 controls the pump drive unit 72, the valve drive unit 74, and the heater unit 76 to perform an operation of delivering dialysis fluid to the user U and an operation of discharging dialysis fluid from the user U.

[0083] The automated peritoneal dialysis system 11 operates as follows.

[0084] In Figure 1, the dialysis cassette 15 is inserted into the slot 66 of the dialysis machine main body 13, and the cover member 65 is closed. When the user U presses the start button 68, the dialysis machine main body 13 starts operating. First, the basic operations performed by the dialysis machine main body 13 will be described. The basic operations performed by the dialysis machine main body 13 include a liquid injection operation and a liquid drainage operation. The liquid injection operation and the liquid drainage operation will be described with reference to Figure 6.

[0085] Prior to the fluid injection operation, priming is performed. Priming is a process of filling the internal flow path 21 of the dialysis cassette 15 with dialysis fluid. The heater unit 76 heats the dialysis fluid during priming. The calculation unit 84 sets the amount of power to be supplied to the heater unit 76 so that the temperature of the heated dialysis fluid is within an appropriate range (e.g., 36.0°C to 38.0°C). When executing the fluid delivery control (step S2 in FIG. 7), which will be described later, the control unit 92 supplies power to the heater unit 76 based on the set value.

[0086] The fluid injection operation is a process of sending dialysis fluid from the dialysis fluid bag 17 into the abdominal cavity of the user U via the dialysis cassette 15. Specifically, the fluid injection operation includes a first fluid injection step and a second fluid injection step.

[0087] In the first injection step, the dialysate is drawn from the dialysate bag 17 into the pump chamber 324 via the introduction line 40 and the first pump line 41. Arrow F1 in Fig. 6 indicates the flow of the dialysate in the first injection step.

[0088] In the first fluid injection step, the control unit 92 selects the open / closed states of the multiple valve units 60 so as to secure a fluid transfer path between the dialysate bag 17 and the pump chamber 324, and pulls the pump membrane unit 322 of the first sheet 24a in a direction away from the base member 22. As a result, the dialysate is drawn into the pump chamber 324, and the dialysate is temporarily stored in the pump chamber 324.

[0089] In the second infusion step, the dialysis fluid is sent from the pump chamber 324 to the abdominal cavity of the user U via the second pump line 42, the heated introduction line 44, the heating unit 34, and the user-side line 46. Arrow F2 in Fig. 6 indicates the flow of the dialysis fluid in the second infusion step.

[0090] In the second infusion step, the control unit 92 selects the open / closed states of the multiple valve units 60 so that a fluid transfer path between the pump chamber 324 and the abdominal cavity of the user U is secured via the heating unit 34, and pushes the pump membrane unit 322 of the first sheet 24a toward the base member 22. This causes the dialysis fluid to be pushed out of the pump chamber 324, heated by the heating unit 34, and then sent into the abdominal cavity of the user U. In the second infusion step, the control unit 92 supplies power to the heater unit 76 so that the dialysis fluid is heated to 36.0°C to 38.0°C.

[0091] The drainage operation of the dialysis device main body 13 is a process of sending used dialysis fluid from the abdominal cavity of the user U to the drainage container 19 via the dialysis cassette 15. Specifically, the drainage operation includes a first drainage step and a second drainage step.

[0092] In the first drainage step, dialysate is drawn from the peritoneal cavity of the user U into the pump chamber 324 via the user side line 46, the relay line 48, and the second pump line 42. Arrow F3 in Figure 6 indicates the flow of dialysate in the first drainage step.

[0093] In the first drainage step, the control unit 92 selects the open / closed states of the multiple valve units 60 so as to secure a fluid transfer path between the abdominal cavity of the user U and the pump chamber 324, and pulls the pump membrane unit 322 of the first sheet 24a in a direction away from the base member 22. As a result, the dialysis fluid is drawn into the pump chamber 324, and the dialysis fluid is temporarily stored in the pump chamber 324.

[0094] In the second drainage step, the dialysate is pumped from the pump chamber 324 to the drain container 19 via the second pump line 42 and the drain line 50. F4 in Figure 6 shows the flow of the dialysate in the second drainage step.

[0095] In the second drainage step, the control unit 92 selects the open / closed states of the multiple valve units 60 so as to secure a flow path between the pump chamber 324 and the drainage container 19, and pushes the pump membrane unit 322 of the first sheet 24a toward the base member 22. This causes the dialysis fluid to be pushed out of the pump chamber 324 and sent to the drainage container 19.

[0096] Next, the control when the dialysis device main body 13 performs the infusion operation will be described in more detail with reference to Figures 7 to 11. In Figures 8 to 11, the open / closed states of the multiple valve units 60 are indicated by open circles, filled circles, and dashed circles. The open circles indicate an open valve state. The filled circles indicate a closed valve state. The dashed circles indicate that either the open valve state or the closed valve state is acceptable. Note that in Figure 6, the open / closed states of the valve units 60 are not distinguished by the above symbols.

[0097] As shown in FIG. 7, in step S1, the determination unit 90 determines whether the temperature Tw of the dialysis fluid heated by the heater unit 76 is higher than the first temperature threshold T1. If the temperature Tw of the dialysis fluid is equal to or lower than the first temperature threshold T1 (step S1: NO), the process proceeds to step S2. If the temperature Tw of the dialysis fluid is higher than the first temperature threshold T1 (step S1: YES), the process proceeds to step S5. The heater unit 76 basically heats the dialysis fluid to a temperature suitable for delivery to the user U. However, for example, due to fluctuations in the installation environment of the automated peritoneal dialysis system 11 (such as fluctuations in temperature), the temperature of the dialysis fluid may become higher than the appropriate range. In such a case, the temperature Tw of the dialysis fluid may become higher than the first temperature threshold T1.

[0098] In step S2, the control unit 92 executes fluid delivery control to deliver the dialysis fluid warmed by the heater unit 76 to the user U without passing through the reservoir unit 36 ​​provided in the medical cassette 14. After the fluid delivery control starts, the process proceeds to step S3. In step S3, the determination unit 90 determines whether the amount of dialysis fluid delivered to the user U has reached a predetermined amount. If the determination unit 90 determines that the predetermined amount of dialysis fluid has not been delivered to the user U (step S3: NO), the process returns to step S1. If the determination unit 90 determines that the predetermined amount of dialysis fluid has been delivered to the user U (step S3: YES), the process proceeds to step S4. In step S4, the control unit 92 executes fluid delivery stop control to stop the delivery of the dialysis fluid to the user U. As a result, the fluid injection operation of the dialysis device main body 13 is completed.

[0099] In step S5, the control unit 92 performs stop control to stop the delivery of dialysis fluid to the user U and to stop heating the dialysis fluid. In the stop control, the control unit 92 sets the delivery path within the dialysis cassette 15 to a path state that can stop the delivery of dialysis fluid to the user U, as shown in Fig. 8. In Fig. 8, the first pump valve 60b, the user-side valve 60f, the relay valve 60g, the drain valve 60h, and the storage valve 60i are closed, and the second pump valve 60c, the heated inlet valve 60d, and the heated outlet valve 60e are open.

[0100] In the stop control, the control unit 92 sets the fluid delivery path within the dialysis cassette 15 to the path state shown in Figure 8, then stops the operation of the pump drive unit 72 and stops the supply of power to the heater unit 76. As a result, the outflow of dialysis fluid from the pump unit 32 stops, and heating of the dialysis fluid by the heater unit 76 in the heating unit 34 stops. After step S5 in Figure 7, heating of the dialysis fluid by the heater unit 76 is stopped until the discharge control (step S9) is completed and the fluid delivery control (S2) is resumed. After step S5, the process proceeds to step S6. Note that if the fluid injection operation has not started at the time of step S1, the stop control in step S5 and the refill control in step S6 are omitted.

[0101] In step S6, the control unit 92 executes refill control to introduce dialysate from the dialysate bag 17 into the pump unit 32. In the refill control, the control unit 92 sets the fluid transfer path in the dialysis cassette 15 to a path state in which dialysate can be transferred from the dialysate bag 17 to the pump unit 32, as shown in FIG. 9. As shown in FIG. 9, in the refill control, the second pump valve 60c, the user-side valve 60f, and the drain valve 60h are closed, and the introduction valve 60a and the first pump valve 60b are open. After setting the fluid transfer path in the dialysis cassette 15 to the path state shown in FIG. 9, the control unit 92 operates the pump driver 72 to draw dialysate from the dialysate bag 17 into the pump unit 32. As a result, the pump unit 32 is filled with dialysate up to its capacity.

[0102] If stop control is executed while dialysis fluid is being discharged from the pump unit 32, the amount of dialysis fluid in the pump unit 32 will be less than the capacity of the pump unit 32. By executing replenishment control, the amount of unheated dialysis fluid in the dialysis cassette 15 can be increased. Note that if there is a sufficient amount of dialysis fluid remaining in the pump unit 32 at the time stop control is executed, the control unit 92 may omit replenishment control. If, for example, the amount of dialysis fluid in the pump unit 32 is 70% or more of the capacity of the pump unit 32 at the time stop control is executed, the control unit 92 may omit replenishment control.

[0103] In step S7, the control unit 92 executes cooling control to cool the dialysis fluid by using the reservoir 36 to flow the dialysis fluid within the medical cassette 14. The cooling control includes a first transfer control, a second transfer control, and a third transfer control.

[0104] In step S71, the control unit 92 executes a first transfer control. In the first transfer control, the control unit 92 transfers the heated dialysis fluid to the storage unit 36. In the first transfer control, the control unit 92 sets the fluid transfer path in the dialysis cassette 15 to a path state in which the dialysis fluid can be transferred from the pump unit 32 to the storage unit 36 ​​via the heating unit 34, as shown in FIG. 10. In the first transfer control, as shown in FIG. 10, the first pump valve 60b, the user-side valve 60f, the drain valve 60h, and the relay valve 60g are closed, and the second pump valve 60c, the heated inlet valve 60d, the heated outlet valve 60e, and the storage valve 60i are open.

[0105] In the first transfer control, the control unit 92 sets the fluid transfer path within the dialysis cassette 15 to the path state shown in FIG. 10 , and then operates the pump driving unit 72 to discharge the dialysis fluid from the pump unit 32 and transfer the dialysis fluid from the heating unit 34 to the storage unit 36. As a result, the dialysis fluid is stored in the storage unit 36, and the storage unit 36 ​​becomes full with the dialysis fluid. By executing the first transfer control, the unheated dialysis fluid discharged from the pump unit 32 and the heated dialysis fluid in the heating unit 34 may at least partially mix, and the temperature Tw of the dialysis fluid may decrease. Furthermore, since the storage unit 36 ​​is not heated by the heater unit 76, it is a region with a lower temperature than the heating unit 34. Therefore, the temperature of the dialysis fluid that has flowed into the storage unit 36 ​​may decrease due to heat removal by the storage unit 36. After step S71 in FIG. 7 , the process proceeds to step S72.

[0106] In step S72, the control unit 92 executes second transfer control. In the second transfer control, the control unit 92 transfers the dialysate from the storage unit 36 ​​to the pump unit 32. In the second transfer control, as shown in FIG. 11, the control unit 92 sets the fluid transfer path within the dialysis cassette 15 to a path state in which the dialysate can be transferred from the storage unit 36 ​​to the pump unit 32 via the relay line 48. As shown in FIG. 11, in the second transfer control, the first pump valve 60b, the user-side valve 60f, the drain valve 60h, the heated inlet valve 60d, and the heated outlet valve 60e are closed, and the second pump valve 60c, the relay valve 60g, and the storage valve 60i are open.

[0107] In the second transfer control, the control unit 92 sets the fluid transfer path within the dialysis cassette 15 to the path state shown in FIG. 11, and then operates the pump drive unit 72 to draw the dialysis fluid from the storage unit 36 ​​into the pump unit 32. As a result, the storage unit 36 ​​becomes empty. The temperature of the dialysis fluid that has flowed into the pump unit 32 decreases as it mixes with the unheated dialysis fluid remaining in the pump unit 32. In this way, by executing the first transfer control and the second transfer control, the dialysis fluid is cooled as the heated dialysis fluid flows within the dialysis cassette 15. After step S72 in FIG. 7, the process proceeds to step S73.

[0108] In step S73, the control unit 92 executes third transfer control. In the third transfer control, the control unit 92 sets the fluid transfer path in the dialysis cassette 15 to a path state in which the dialysis fluid can be transferred from the pump unit 32 to the storage unit 36 ​​via the heating unit 34, as shown in FIG. 10. After setting the fluid transfer path in the dialysis cassette 15 to the path state shown in FIG. 10, the control unit 92 operates the pump drive unit 72 to discharge the dialysis fluid from the pump unit 32 and transfer the dialysis fluid from the heating unit 34 to the storage unit 36. As a result, the dialysis fluid is stored in the storage unit 36. The storage unit 36 ​​becomes full with dialysis fluid. After step S73 in FIG. 7, the process proceeds to step S8.

[0109] In step S8, the determination unit 90 determines whether the temperature Tw of the dialysis fluid cooled by the cooling control is equal to or lower than a predetermined second temperature threshold T2. Information about the temperature Tw detected by the second temperature sensor 80 is used for the determination by the determination unit 90 in step S8. If the temperature Tw of the dialysis fluid is equal to or lower than the second temperature threshold T2 (step S8: YES), the process proceeds to step S9. If the temperature Tw of the dialysis fluid is higher than the second temperature threshold T2 (step S8: NO), the control unit 92 continues the cooling control. Specifically, the control unit 92 repeats the second transfer control and the third transfer control until the temperature Tw of the dialysis fluid becomes equal to or lower than the second temperature threshold T2. This allows the dialysis fluid to be cooled to equal to or lower than the second temperature threshold T2. Note that in step S8, the determination unit 90 may make the determination using information about the temperature Tw of the dialysis fluid detected by the first temperature sensor 78. In this case, the second temperature sensor 80 may not be provided.

[0110] In step S9, discharge control is executed to discharge the dialysate from the storage unit 36 ​​to the pump unit 32. In the discharge control, the control unit 92 sets the fluid transfer path within the dialysis cassette 15 to a path state in which the dialysate can be transferred from the storage unit 36 ​​to the pump unit 32 via the relay line 48, as shown in FIG. 11. After setting the fluid transfer path within the dialysis cassette 15 to the path state shown in FIG. 11, the control unit 92 operates the pump drive unit 72 to draw the dialysate from the storage unit 36 ​​to the pump unit 32. As a result, the storage unit 36 ​​becomes empty. This allows the storage unit 36 ​​to be kept empty in preparation for the next cooling control.

[0111] After step S9, the process proceeds to step S2. That is, the control unit 92 resumes the fluid delivery control. In resuming the fluid delivery control, the control unit 92 resumes the power supply to the heater unit 76 and heats the dialysis fluid using the heating unit 34. As a result, the heated dialysis fluid is delivered to the user U.

[0112] This embodiment has the following advantages.

[0113] As described above, when the determination unit 90 determines that the temperature Tw of the dialysis fluid heated by the heater unit 76 is higher than the first temperature threshold T1, the control unit 92 stops the delivery of the dialysis fluid to the user U and stops heating the dialysis fluid, as shown in FIG. 8 . Also, as shown in FIG. 9 , the control unit 92 cools the dialysis fluid by using the reservoir 36 to flow the dialysis fluid within the medical cassette 14. This prevents overheated dialysis fluid from being delivered to the user U, thereby preventing the user U from feeling uncomfortable due to the temperature of the dialysis fluid. Furthermore, because the dialysis fluid is flowed within the medical cassette 14, the dialysis fluid can be cooled more quickly than when the dialysis fluid is not flowed and the temperature of the dialysis fluid is allowed to drop within the medical cassette 14. Moreover, because the overheated dialysis fluid is not discarded, the dialysis fluid can be used more effectively.

[0114] When the determination unit 90 determines that the temperature Tw of the dialysis fluid cooled by the cooling control is equal to or lower than the second temperature threshold T2, the control unit 92 terminates the cooling control and resumes the fluid delivery control. On the other hand, when the determination unit 90 determines that the temperature Tw of the dialysis fluid is higher than the second temperature threshold T2, the control unit 92 continues the cooling control. As a result, the fluid delivery control is resumed after the dialysis fluid has been cooled to a temperature equal to or lower than the second temperature threshold T2, and therefore, it is possible to effectively prevent overheated dialysis fluid from being delivered to the user U.

[0115] 7, 10, and 11, the cooling control includes a first transfer control for transferring the dialysis fluid heated by the heater unit 76 to the storage unit 36, and a second transfer control for transferring the dialysis fluid from the storage unit 36 ​​to the pump unit 32. As a result, the dialysis fluid is cooled by the storage unit 36, and the dialysis fluid flowing into the pump unit 32 is mixed with the dialysis fluid remaining in the pump unit 32, thereby cooling the dialysis fluid. Therefore, the dialysis fluid can be cooled effectively.

[0116] 11 , in the second transfer control, the control unit 92 transfers the dialysis fluid from the reservoir 36 to the pump unit 32 via the relay line 48 provided in the medical cassette 14 without passing through the heating unit 34. This allows the dialysis fluid to be efficiently transferred from the reservoir 36 to the pump unit 32.

[0117] 7 and 10, the cooling control further includes a third transfer control, which transfers the dialysis fluid from the pump unit 32 to the storage unit 36 ​​via the heating unit 34 after the second transfer control. When the determination unit 90 determines that the temperature Tw of the dialysis fluid cooled by the cooling control is higher than the second temperature threshold T2, the control unit 92 repeats the second transfer control and the third transfer control until the temperature Tw of the dialysis fluid becomes equal to or lower than the second temperature threshold T2. This makes it possible to effectively prevent overheated dialysis fluid from being delivered to the user U.

[0118] The determination unit 90 determines whether the temperature Tw of the dialysis fluid flowing out of the pump unit 32 and transferred to the heating unit 34 by the third transfer control is equal to or lower than the second temperature threshold T2. This makes it possible to appropriately determine whether or not the cooling control needs to be continued based on the temperature Tw of the dialysis fluid immediately after it flows out of the pump unit 32.

[0119] 7 and 11, after the cooling control is completed and before the fluid supply control is resumed, the control unit 92 executes discharge control to discharge the dialysis fluid from the reservoir 36 to the pump unit 32. This allows the reservoir 36 to be kept empty in preparation for the next cooling control.

[0120] 7 and 9, between the stop control and the cooling control, the control unit 92 executes replenishment control to introduce dialysis fluid from the dialysis fluid bag 17 into the pump unit 32. By executing replenishment control, the amount of unheated dialysis fluid in the dialysis cassette 15 can be increased. This enhances the cooling effect of the dialysis fluid by the cooling control.

[0121] 6, the fluid supply path within the medical cassette 14 can be selectively switched by the valve mechanism 38 to a path state in which heated dialysis fluid can be supplied to the user U without passing through the reservoir 36. In addition, the fluid supply path within the medical cassette 14 can be selectively switched by the valve mechanism 38 to a path state in which the dialysis fluid can be cooled by flowing the dialysis fluid within the medical cassette 14 using the reservoir 36. With this configuration, by flowing the dialysis fluid within the medical cassette 14 while heating of the dialysis fluid by the heater 34 is stopped, it is possible to prevent overheated dialysis fluid from being supplied to the user U.

[0122] The medical cassette 14 includes a user line 46 that connects the heating unit 34 and the user port 28, and a storage line 52 that connects the user line 46 and the storage unit 36. With this configuration, the dialysis fluid can be transferred from the heating unit 34 to the storage unit 36, and the storage unit 36 ​​can be used to effectively cool the dialysis fluid.

[0123] The valve mechanism 38 has a user-side valve 60f provided on the user-side line 46 and a reservoir valve 60i provided on the reservoir line 52. With this configuration, by closing the user-side valve 60f and opening the reservoir valve 60i, a path state in which the dialysis fluid can be transported to the reservoir 36 can be formed.

[0124] The medical cassette 14 has a relay line 48 for transferring the dialysis fluid from the reservoir 36 to the pump unit 32 without passing through the heating unit 34. With this configuration, the dialysis fluid can be efficiently transferred from the reservoir 36 to the pump unit 32.

[0125] The valve mechanism 38 has a relay valve 60g provided on the relay line 48. With this configuration, by opening the relay valve 60g, a path state can be formed in which the dialysis fluid can be transported from the reservoir 36 to the pump unit 32.

[0126] Although the present disclosure has been described in detail, the present disclosure is not limited to the individual embodiments described above. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. These embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these. The same applies when numerical values ​​or mathematical expressions are used in the description of the above-described embodiments. [Explanation of symbols]

[0127] 10...Medical fluid delivery system 12...Medical fluid delivery device 14...Medical cassette 16...Liquid container 32...Pump section 34…Heating section 36...Storage section 38...Valve mechanism 60...Valve section 64...Cassette mounting section 72...Pump drive unit 76...Heater section 88…Temperature acquisition section 90...Judgment section 92...Control unit

Claims

1. A medical fluid delivery device comprising a cassette mounting portion to which a medical cassette can be detachably attached, which draws liquid from a liquid container into the medical cassette and delivers the liquid to a user, a pump driving unit that operates a pump unit for feeding a liquid provided in the medical cassette; a heater unit located in a heating unit provided in the medical cassette for selectively heating the liquid; a temperature acquisition unit that acquires information about the temperature of the liquid; a determination unit that determines whether the temperature of the liquid heated by the heater unit is higher than a predetermined first temperature threshold; a control unit that controls the pump drive unit and the heater unit, When the determination unit determines that the temperature of the liquid heated by the heater unit is equal to or lower than the first temperature threshold, the control unit executes liquid delivery control to deliver the liquid heated by the heater unit to the user without passing through a storage unit provided in the medical cassette; A medical fluid delivery device in which, when the determination unit determines that the temperature of the liquid heated by the heater unit is higher than the first temperature threshold, the control unit executes stop control to stop the delivery of the liquid to the user and stop heating the liquid, and cooling control to cool the liquid by using the storage unit to flow the liquid within the medical cassette.

2. The medical fluid delivery device according to claim 1, the determination unit determines whether the temperature of the liquid cooled by the cooling control is equal to or lower than a predetermined second temperature threshold; When the determination unit determines that the temperature of the liquid cooled by the cooling control is equal to or lower than the second temperature threshold, the control unit ends the cooling control and resumes the liquid sending control; When the determination unit determines that the temperature of the liquid cooled by the cooling control is higher than the second temperature threshold, the control unit continues the cooling control.

3. The medical fluid delivery device according to claim 1, The cooling control includes a first transfer control for transferring the liquid heated by the heater section to the storage section, and a second transfer control for transferring the liquid from the storage section to the pump section.

4. The medical fluid delivery device according to claim 3, In the second transfer control, the control unit transfers the liquid from the storage unit to the pump unit via a relay line provided in the medical cassette without passing through the heating unit, in a medical fluid delivery device.

5. The medical fluid delivery device according to claim 3 or 4, the cooling control further includes, after the second transfer control, a third transfer control of transferring the liquid from the pump unit to the storage unit via the heating unit; the determination unit determines whether the temperature of the liquid cooled by the cooling control is equal to or lower than a predetermined second temperature threshold; When the determination unit determines that the temperature of the liquid cooled by the cooling control is equal to or lower than the second temperature threshold, the control unit ends the cooling control and resumes the liquid sending control; A medical fluid delivery device in which, when the determination unit determines that the temperature of the liquid cooled by the cooling control is higher than the second temperature threshold, the control unit repeats the second transfer control and the third transfer control until the temperature of the liquid becomes lower than the second temperature threshold.

6. The medical fluid delivery device according to claim 5, The medical fluid delivery device, wherein the determination unit determines whether the temperature of the liquid flowing out of the pump unit and delivered to the heating unit by the third delivery control is equal to or lower than the second temperature threshold value.

7. The medical fluid delivery device according to claim 5, The control unit executes discharge control to discharge the liquid from the reservoir unit to the pump unit after the cooling control ends and before the liquid delivery control is resumed.

8. The medical fluid delivery device according to claim 1, The control unit executes a refill control to introduce the liquid from the liquid container into the pump unit between the stop control and the cooling control.

9. A medical cassette that is detachably attached to a medical fluid delivery device, aspirates liquid from a liquid container, and delivers the liquid to a user, an introduction port for introducing the liquid from the liquid container into the medical cassette; a pump unit that transfers the liquid by sucking and discharging the liquid; a valve mechanism including a plurality of valve portions for switching a fluid delivery path within the medical cassette; a heating unit having a heating flow path formed therein for receiving the liquid from the pump unit and heating the liquid; a user port for delivering the heated liquid to the user; a storage section capable of temporarily storing the heated liquid; A medical cassette in which the liquid delivery path within the medical cassette can be selectively switched by the valve mechanism between a path state in which the heated liquid can be delivered to the user without passing through the storage section, and a path state in which the liquid can be cooled by flowing the liquid within the medical cassette using the storage section.

10. 10. The medical cassette of claim 9, A user-side line that is a flow path connecting the heating unit and the user-side port; A medical cassette comprising: a reservoir line that is a flow path connecting the user line and the reservoir.

11. 11. The medical cassette of claim 10, A medical cassette, wherein the valve mechanism includes a user-side valve provided on a flow path between the branch point of the storage line from the user-side line and the user-side port, and a storage valve provided on the storage line.

12. 11. The medical cassette according to claim 9 or 10, A medical cassette having a relay line that is a flow path for transporting the liquid from the reservoir to the pump without passing through the heating section.

13. 13. The medical cassette of claim 12, The medical cassette, wherein the valve mechanism includes a relay valve provided on the relay line.

14. A medical fluid delivery system comprising: a medical fluid delivery device having a cassette mounting portion; and a medical cassette detachably attached to the cassette mounting portion of the medical fluid delivery device, wherein the medical fluid delivery system aspirates liquid from a liquid container into the medical cassette and delivers the liquid to a user, The medical cassette comprises: an introduction port for introducing the liquid from the liquid container into the medical cassette; a pump unit that transfers the liquid by sucking and discharging the liquid; a heating unit having a heating flow path formed therein for receiving the liquid from the pump unit and heating the liquid; a user port for delivering the heated liquid to the user; a storage section capable of temporarily storing the heated liquid; The medical fluid delivery device includes: a pump driving unit that operates the pump unit of the medical cassette; a heater unit that selectively heats the liquid located in the heating unit of the medical cassette; a temperature acquisition unit that acquires information about the temperature of the liquid; a determination unit that determines whether the temperature of the liquid heated by the heater unit is higher than a predetermined first temperature threshold; a control unit that controls the pump drive unit and the heater unit, When the determination unit determines that the temperature of the liquid heated by the heater unit is equal to or lower than the first temperature threshold, the control unit executes liquid delivery control to deliver the liquid heated by the heater unit to the user without passing through the storage unit; A medical fluid delivery system in which, when the determination unit determines that the temperature of the liquid heated by the heater unit is higher than the first temperature threshold, the control unit executes stop control to stop the delivery of the liquid to the user and stop heating the liquid, and cooling control to cool the liquid by using the storage unit to flow the liquid within the medical cassette.

Images