Body cavity fluid treatment system and method of using the body cavity fluid treatment system

Abstract

To restrain an increase in the pressure of a concentrator when recovering ascitic fluid remaining in a line in an ascitic fluid treatment system.SOLUTION: An ascitic fluid treatment system 1 comprises an ascitic fluid bag 10, a filter 11, a concentrator 12, a concentrated ascitic fluid bag 13, a first liquid delivery line 14, a second liquid delivery line 15, a third liquid delivery line 16, a fourth liquid delivery line 17, a first pump 51 provided in the second liquid delivery line 15, a second pump 60 provided in the third liquid delivery line 16, a gas introduction part 53 capable of introducing gas to a gas introduction position provided in the second liquid delivery line 15 downstream of the first pump 51, and a check valve 65 provided in the fourth liquid delivery line 17, and for preventing backflow to the concentrator 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a body cavity fluid treatment system and a method for using the body cavity fluid treatment system. [Background technology]

[0002] Ascites, a type of body cavity fluid, can be treated by cell-free and concentrated ascites reinfusion therapy, which involves extracting the fluid from the patient, removing pathogenic substances such as bacteria and cancer cells from it, concentrating it while leaving useful components such as albumin, and then returning the concentrated ascites to the body.

[0003] In such a treatment, an ascites treatment system is generally used. In this ascites treatment system, for example, an ascites bag, a filter, a concentrator, and a concentrated ascites bag are connected in this order by a liquid supply line, and the ascites is filtered and concentrated by flowing it with a pump on the liquid supply line (see Patent Document 1). In such an ascites treatment system, for example, pumps are provided on the upstream and downstream sides of the concentrator, and the ascites is concentrated to a predetermined concentration in the concentrator by adjusting the flow rates of the two pumps.

[0004] In the ascites treatment system described above, the ascites remaining in the liquid supply line is collected in a concentrated ascites bag after the ascites filtration and concentration process is completed. The collection of the residual ascites in the liquid supply line is performed, for example, by operating two pumps in the same manner as in the ascites filtration and concentration process. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-013491 A Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, when the remaining ascites is collected in the ascites treatment system as described above, the pressure in the concentrator (trans membrane pressure (TMP)) may increase due to clogging of the concentrating membrane of the concentrator, and the ascites treatment system may stop. If the ascites treatment system stops during the collection of the remaining ascites, work must be done by medical personnel and the time required for ascites treatment will be extended, which is undesirable.

[0007] The present invention has been made in consideration of these points, and its object is to provide a body cavity fluid treatment system and a method for using the body cavity fluid treatment system that can suppress an increase in pressure in the concentrator when recovering body cavity fluid such as ascites remaining in the line. [Means for solving the problem]

[0008] After extensive research, the inventors discovered that the above problem could be solved by providing a gas inlet upstream of the concentrator and a backflow prevention section in the liquid delivery line through which the concentrator's waste liquid passes, and thus completed the present invention.

[0009] That is, the present invention includes the following aspects. (1) A body cavity fluid treatment system for treating body cavity fluid, comprising: a storage unit for storing body cavity fluid; a second fluid supply line for supplying the body cavity fluid filtered by the filter to the concentrator; a third fluid supply line for supplying the body cavity fluid concentrated by the concentrator to the collection section; a fourth fluid supply line for discharging waste fluid removed by the concentrator; a first pump provided in the first fluid supply line or the second fluid supply line; a second pump provided in the third fluid supply line; a gas introduction section capable of introducing gas to a gas introduction position provided in the second fluid supply line or the filter downstream of the first pump; and a backflow prevention section provided in the fourth fluid supply line for preventing backflow into the concentrator. (2) The body cavity fluid processing system described in (1), further comprising a control unit that executes a recovery process of stopping the first pump and activating the second pump to introduce gas from the gas introduction section and recover the body cavity fluid downstream of the gas introduction position in the recovery section. (3) The control unit of the body cavity fluid processing system described in (2) above, prior to the recovery process, operates the first pump and the second pump to perform a pre-process of moving the filtered body cavity fluid in the filter downstream of the gas introduction position in the second fluid delivery line. (4) The body cavity fluid processing system described in (3), wherein the first pump is provided in the second fluid supply line, and the body cavity fluid processing system further includes a fifth fluid supply line that supplies the body cavity fluid in the recovery section to a junction position upstream of the first pump in the second fluid supply line, and the control unit performs a subsequent process of stopping the second pump after the recovery process, operating the first pump in the reverse direction to that during processing, introducing gas from the gas introduction section, and recovering the body cavity fluid in the fifth fluid supply line in the recovery section. (5) A method of using a body cavity fluid processing system for processing body cavity fluid, comprising: a storage section for storing body cavity fluid; a filter; a concentrator; a collection section for collecting body cavity fluid; a first fluid supply line for sending the body cavity fluid in the storage section to the filter; a second fluid supply line for sending the body cavity fluid filtered by the filter to the concentrator; a third fluid supply line for sending the body cavity fluid concentrated by the concentrator to the collection section; a fourth fluid supply line for discharging waste fluid removed by the concentrator; A method of using a body cavity fluid processing system comprising a second pump provided in a third liquid supply line, a gas introduction section capable of introducing gas to a gas introduction position provided in the second liquid supply line or a filter downstream of the first pump, and a backflow prevention section provided in the fourth liquid supply line for preventing backflow into the concentrator, the method comprising stopping the first pump, operating the second pump, introducing gas from the gas introduction section, and executing a recovery process of recovering the body cavity fluid downstream of the gas introduction position in the recovery section. (6) A method of using the body cavity fluid processing system described in (5), comprising, prior to the recovery step, operating the first pump and the second pump to perform a pre-step of moving the filtered body cavity fluid in the filter downstream of the gas introduction position in the second fluid delivery line. (7) A method of using the body cavity fluid processing system described in (6), wherein the first pump is provided in the second fluid supply line, and the body cavity fluid processing system further includes a fifth fluid supply line that supplies the body cavity fluid in the recovery section to a junction position upstream of the first pump in the second fluid supply line, and after the recovery step, a subsequent step is performed in which the second pump is stopped, the first pump is operated in the reverse direction to that during processing, gas is introduced from the gas introduction section, and the body cavity fluid in the fifth fluid supply line is recovered in the recovery section. Effect of the Invention

[0010] According to the present invention, in a body cavity fluid treatment system, it is possible to suppress an increase in pressure in the concentrator when recovering body cavity fluid remaining in the line. [Brief description of the drawings]

[0011] [Figure 1] 1 is an explanatory diagram showing an outline of the configuration of an ascites treatment system; [Diagram 2] FIG. 2 is an explanatory diagram showing the state of the ascites treatment system during reconcentration treatment. [Diagram 3] FIG. 2 is an explanatory diagram showing the state of the ascites treatment system during the ascites recovery process. [Figure 4] FIG. 13 is an explanatory diagram showing the state of the ascites treatment system during a process prior to the recovery process. [Diagram 5] FIG. 13 is an explanatory diagram showing the state of the ascites treatment system during a process subsequent to the recovery process. [Figure 6] FIG. 2 is an explanatory diagram showing the configuration of an ascites treatment system when a first pump is provided in a first liquid supply line. [Figure 7] 10 is an explanatory diagram showing the configuration of an ascites treatment system when a gas introduction position is provided in a filter. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an example of a preferred embodiment of the present invention will be described with reference to the drawings. In this specification, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings unless otherwise specified.

[0013] FIG. 1 is an explanatory diagram showing an outline of the configuration of an ascites treatment system 1 as a body cavity fluid treatment system according to this embodiment.

[0014] The ascites treatment system 1 includes an ascites bag 10 as a storage section for body cavity fluid, a filter 11, a concentrator 12, a concentrated ascites bag 13 as a recovery section for concentrated body cavity fluid, a first fluid supply line 14, a second fluid supply line 15, a third fluid supply line 16, a fourth fluid supply line 17, a fifth fluid supply line 18, a sixth fluid supply line 19, a control section 20, etc.

[0015] The ascites bag 10 is, for example, a soft bag, and is capable of containing ascites collected from a patient.

[0016] The filter 11 has, for example, a cylindrical housing. The filter 11 has liquid passage ports 11a and 11b at both ends in the longitudinal direction (vertical direction) and two liquid passage ports 11c and 11d on the side surface. In this specification, the up and down of the ascites treatment system 1 is based on the posture during normal use.

[0017] The filter 11 is equipped with a filtration membrane 30 that removes predetermined pathogenic substances such as bacteria and cancer cells and allows predetermined useful components such as albumin to pass through. The filtration membrane 30 is composed of, for example, a number of hollow fiber membranes. A space 30a on the primary side of the filtration membrane 30 (the internal space of the hollow fiber membrane) communicates with the liquid passage ports 11a and 11b, and a space 30b on the secondary side of the filtration membrane 30 (the external space of the hollow fiber membrane) communicates with the liquid passage ports 11c and 11d.

[0018] The concentrator 12 has, for example, a cylindrical housing. The concentrator 12 has liquid passage ports 12a and 12b at both ends in the longitudinal direction (vertical direction) and two liquid passage ports 12c and 12d on the side surface.

[0019] The concentrator 12 is equipped with a concentration membrane 40 that removes water from, for example, ascites and concentrates the fluid. The concentration membrane 40 is composed of, for example, a number of hollow fiber membranes. A space 40a on the primary side of the concentration membrane 40 (the inner space of the hollow fiber membrane) communicates with the liquid passage ports 12a and 12b, and a space 40b on the secondary side of the concentration membrane 40 (the outer space of the hollow fiber membrane) communicates with the liquid passage ports 12c and 12d.

[0020] The concentrated ascites bag 13 is, for example, a soft bag, and is capable of containing the concentrated ascites concentrated in the concentrator 12 .

[0021] The first liquid supply line 14 connects the ascites bag 10 and the filter 11. The upstream end of the first liquid supply line 14 is connected to the ascites bag 10, and the downstream end of the first liquid supply line 14 is connected to the liquid passage port 11a of the filter 11. That is, the liquid passage port 11a of the filter 11 is the inlet of the filter 11 into which the ascites flows. The first liquid supply line 14 is provided with a first valve 41 that opens and closes the first liquid supply line 14. In this specification, the "upstream side" refers to the upstream side during normal ascites treatment in which the ascites flows through the filter 11 and the concentrator 12 in this order, and the "downstream side" refers to the downstream side during normal ascites treatment.

[0022] An upstream end of the sixth liquid supply line 19 is connected to the liquid passage port 11b of the filter 11. A downstream end of the sixth liquid supply line 19 is connected to a waste liquid section (not shown) that accommodates the drainage liquid removed from the ascites by the filter 11, for example.

[0023] A gas inlet 46 that introduces gas into the filter 11 through a line 45 is connected to the liquid passage port 11c of the filter 11. The gas inlet 46 is, for example, an air opening portion.

[0024] The second liquid supply line 15 connects the filter 11 and the concentrator 12. The upstream end of the second liquid supply line 15 is connected to the liquid passage port 11d of the filter 11, and the downstream end of the second liquid supply line 15 is connected to the liquid passage port 12a at the upper end of the concentrator 12. That is, the liquid passage port 11d of the filter 11 serves as the outlet of the filter 11 through which the ascites flows out, and the liquid passage port 12a of the concentrator 12 serves as the inlet of the concentrator 12 through which the ascites flows in.

[0025] In the second liquid supply line 15, for example, a second valve 50, a first pump 51, and a drip chamber 52 are provided in this order from the upstream side to the downstream side. The second valve 50 opens and closes the second liquid supply line 15. The first pump 51 is a tube pump that operates the tube of the second liquid supply line 15 to supply liquid. The first pump 51 also functions as a blocking means for blocking the tube when stopped.

[0026] A gas introduction part 53 that introduces a gas into the second liquid feed line 15 is connected to the second liquid feed line 15. The gas introduction part 53 is, for example, an air opening part, and can introduce air as a gas into the second liquid feed line 15 through a line 54 connected to the drip chamber 52. That is, the drip chamber 52 serves as a gas introduction position in the second liquid feed line 15, and the gas introduction position is located downstream of the first pump 51.

[0027] The third fluid supply line 16 connects the concentrator 12 and the concentrated ascites bag 13. The upstream end of the third fluid supply line 16 is connected to the fluid passage port 12b at the lower end of the concentrator 12, and the downstream end of the third fluid supply line 16 is connected to the concentrated ascites bag 13. In other words, the fluid passage port 12b of the concentrator 12 serves as the outlet of the concentrator 12 from which the ascites flows out.

[0028] A second pump 60 is provided in the third liquid delivery line 16. The second pump 60 is a tube pump that delivers liquid through the tube of the second liquid delivery line 15. The second pump 60 also functions as a blocking means for blocking the tube when the pump is stopped.

[0029] The upstream end of the fourth liquid supply line 17 is connected to, for example, the liquid passage ports 12c and 12d of the concentrator 12. That is, the liquid passage ports 12c and 12d of the concentrator 12 are the outlets of the concentrator 12 from which the effluent flows out. The upstream end of the fourth liquid supply line 17 may be connected to only one of the liquid passage ports 12c and 12d. The downstream end of the fourth liquid supply line 17 is connected to a waste liquid section (not shown) that accommodates the effluent removed from the ascites by the concentrator 12. The fourth liquid supply line 17 is provided with a check valve 65 as a backflow prevention section that prevents backflow in the fourth liquid supply line 17 to the concentrator 12.

[0030] The fifth liquid supply line 18 connects the concentrated ascites bag 13 and the first liquid supply line 14. One end (upstream end) of the fifth liquid supply line 18 is connected to the concentrated ascites bag 13. The other end (downstream end) of the fifth liquid supply line 18 is connected to a junction between the second valve 50 and the first pump 51 in the second liquid supply line 15. The fifth liquid supply line 18 is provided with a third valve 70 that opens and closes the fifth liquid supply line 18.

[0031] The first to sixth liquid transfer lines 14 to 19 are made of, for example, soft tubes.

[0032] The control unit 20 is, for example, a computer having a CPU, memory, etc. The control unit 20 can execute ascites treatment by controlling the operation of each device such as the first pump 51, the second pump 60, the first valve 41, the second valve 50, and the third valve 70. The control unit 20 can realize the ascites treatment by, for example, executing a program stored in the memory with the CPU.

[0033] For example, the control unit 20 can execute a recovery process in which the first pump 51 is stopped and the second pump 60 is operated to introduce gas from the gas introduction unit 53 into the second liquid supply line 15, and the ascites located downstream of the gas introduction position of the second liquid supply line 15 is recovered into the concentrated ascites bag 13.

[0034] Next, an ascites treatment carried out using the above-mentioned ascites treatment system 1 will be described.

[0035] 1, an ascites bag 10 containing ascites collected from a patient is connected to a first fluid supply line 14. Next, the third valve 70 is closed, the first valve 41 and the second valve 50 are opened, and the first pump 51 and the second pump 60 are operated to start filtering and concentrating the ascites. At this time, the set flow rate Q1 of the first pump 51 is set to be larger than the set flow rate Q2 of the second pump 60.

[0036] The ascites in the ascites bag 10 is sent to the filter 11 through the first liquid supply line 14. The ascites flows from the liquid passage port 11a of the filter 11 into the space 30a on the primary side of the filtration membrane 30, passes through the filtration membrane 30, and flows out into the space 30b on the secondary side of the filtration membrane 30. At this time, a predetermined pathogenic substance is removed from the ascites. The drainage fluid that does not pass through the filtration membrane 30 in the space 30a on the primary side of the filtration membrane 30 is discharged through the sixth liquid supply line 19 to a waste fluid section (not shown).

[0037] The ascites that flows out into the space 30b on the secondary side of the filtration membrane 30 flows out from the liquid passage 11d of the filter 11 into the second liquid supply line 15, and is sent to the concentrator 12 through the second liquid supply line 15. At this time, the second liquid supply line 15 is at a positive pressure with respect to the atmosphere, so that the atmosphere is not introduced from the gas introduction part 53. The ascites flows into the space 40a on the primary side of the concentration membrane 40 from the inlet (liquid passage 12a) of the concentrator 12, and is discharged from the outlet (liquid passage 12b). At this time, since the set flow rate Q1 of the first pump 51 is larger than the set flow rate Q2 of the second pump 60, some of the water in the ascites passes through the concentration membrane 40 and flows out into the space 40b on the secondary side of the concentration membrane 40. As a result, the water is mainly removed from the ascites, and the ascites is concentrated. The concentrated ascites concentrated in the concentrator 12 is stored in the concentrated ascites bag 13 through the third liquid supply line 16. The waste liquid removed by the concentrator 12 is discharged through a fourth liquid delivery line 17 to a waste liquid section (not shown).

[0038] For example, when a predetermined time has elapsed since the start of the filtration and concentration process and, for example, the ascites in the ascites bag 10 has run out, the second valve 50 is closed and the third valve 70 is opened as shown in FIG. 2. The first pump 51 and the second pump 60 are then operated, and the concentrated ascites in the concentrated ascites bag 13 is supplied to the second liquid supply line 15 through the fifth liquid supply line 18, and is supplied to the concentrator 12 through the second liquid supply line 15, where it is reconcentrated. Thereafter, the concentrated ascites is returned to the concentrated ascites bag 13 through the third liquid supply line 16. After the reconcentration process of the concentrated ascites is performed for a predetermined time, the first pump 51 and the second pump 60 are stopped, and a series of filtration and concentration processes is completed.

[0039] Next, a recovery step is performed to recover ascites remaining in the second liquid feed line 15, the concentrator 12, and the third liquid feed line 16 of the ascites treatment system 1. For example, as shown in FIG. 3, while the first pump 51 is stopped, the second pump 60 is operated, and air is sucked from the gas introduction part 53 and introduced into the second liquid feed line 15. As a result, ascites remaining downstream of the gas introduction position of the second liquid feed line 15, i.e., the section between the gas introduction position in the second liquid feed line 15 and the concentrator 12, the space 40a on the primary side of the concentrator 12, and the third liquid feed line 16, are pushed by the air and recovered in the concentrated ascites bag 13. At this time, in the concentrator 12, the ascites in the space 40a on the primary side passes through without being removed by the concentration membrane 40. In the fourth liquid feed line 17, the check valve 65 prevents the drainage from flowing back into the concentrator 12. The set flow rate of the second pump 60 may be changed and made higher than the set flow rate during the filtration and concentration treatment.

[0040] Thereafter, when the air introduced into the second fluid supply line 15 reaches, for example, the concentrated ascites bag 13, the second pump 60 stops, and the process of recovering the remaining ascites ends.

[0041] According to this embodiment, the ascites treatment system 1 includes the gas introduction part 53 capable of introducing gas into the gas introduction position provided in the second liquid supply line 15 downstream of the first pump 51, and the check valve 65 provided in the fourth liquid supply line 17. By operating the second pump 60 and sucking the gas downstream of the first pump 51 of the second liquid supply line 15, the ascites remaining in the line can be collected in the concentrated ascites bag 13. At this time, in the concentrator 12, there is no flow rate difference between the inlet 12a and the outlet 12b, and the ascites only passes through and is not concentrated, so that it is possible to suppress the pressure of the concentrator 12 from increasing when the remaining ascites is collected. As a result, it is possible to prevent the pressure of the concentrator 12 from increasing during the collection of the remaining ascites, causing the ascites treatment system 1 to stop.

[0042] In the above embodiment, the control unit 20 may execute a pre-processing step of operating the first pump 51 and the second pump 60 prior to the residual ascites recovery process, to move the filtered ascites in the filter 11 downstream of the gas introduction position of the second liquid supply line 15.

[0043] In this case, before the above-mentioned recovery step, for example, the first valve 41 and the third valve 70 are closed, the second valve 50 is opened, and the first pump 51 and the second pump 60 are operated as shown in FIG. 4. As a result, the atmosphere is sucked from the gas introduction part 46 and introduced into the filter 11, and the filtered ascites in the secondary space 30b of the filter 11 is pushed by the atmosphere and moves to the downstream side of the second liquid supply line 15. At this time, a part of the ascites in the third liquid supply line 16 is collected in the concentrated ascites bag 13. Then, for example, when the ascites remaining in the filter 11 moves downstream of the gas introduction position of the second liquid supply line 15, the first pump 51 is stopped. The timing at which the first pump 51 stops may be determined by knowing in advance a predetermined time required for the ascites in the filter 11 to move downstream of the gas introduction position and operating the first pump 51 for a predetermined time, or a gas detection sensor may be provided near the gas introduction position of the second liquid delivery line 15, and the first pump 51 may be stopped when the gas detection sensor detects gas.

[0044] 3, while the first pump 51 is stopped, the second pump 60 is operated to introduce air from the gas introduction part 53 into the second liquid supply line 15, and the ascites fluid downstream of the gas introduction position is collected in the concentrated ascites bag 13. According to this example, a larger amount of remaining ascites fluid can be collected in the concentrated ascites bag 13.

[0045] Furthermore, in the above embodiments, after the residual ascites recovery process, the control unit 20 may perform a subsequent process of stopping the second pump 60, operating the first pump 51 in the reverse direction to that during processing, and introducing gas from the gas introduction unit 53 to recover the ascites in the fifth liquid supply line 18 into the concentrated ascites bag 13.

[0046] In this case, after the above-mentioned recovery step, for example, as shown in FIG. 5, the third valve 70 is opened, the second valve 50 is closed, the second pump 60 is stopped, and the first pump 51 is operated in the opposite direction (upstream direction) to the processing time. As a result, air is introduced from the gas introduction part 53 to the second liquid transfer line 15. Then, the ascites remaining in the fifth liquid transfer line 18 is pushed by the air and collected in the concentrated ascites bag 13. According to this example, the ascites remaining in the fifth liquid transfer line 18 can also be collected by using the introduction of gas from the gas introduction part 53. When the latter step is performed, the above-mentioned former step may also be performed. That is, the former step, the recovery step, and the latter step may be performed in this order.

[0047] The configuration of the ascites treatment system 1 is not limited to that in the above embodiment.

[0048] For example, as shown in Fig. 6, the first pump 51 may be located in the first liquid supply line 14. In this case, when the remaining ascites recovery step is performed, for example, the first pump 51 is stopped, the second valve 50 and the third valve 70 are closed, and the second pump 60 is operated to suck and introduce air into the second liquid supply line 15 from the gas introduction part 53. As a result, the ascites remaining downstream of the gas introduction position of the second liquid supply line 15, i.e., the section between the gas introduction position of the second liquid supply line 15 and the concentrator 12, the space 40a on the primary side of the concentrator 12, and the third liquid supply line 16, is pushed by the air and recovered in the concentrated ascites bag 13.

[0049] In this case, the gas introduction position of the gas introduction part 53 may be located upstream of the joining position of the second liquid supply line 15 with the fifth liquid supply line 18 .

[0050] When the first pump 51 is in the first liquid supply line 14, the gas introduction position of the gas introduction part 53 may be provided in the filter 11 as shown in Fig. 7. In this case, the gas introduction position of the gas introduction part 53 may be a liquid passage port 11c leading to the secondary space 30b of the filtration membrane 30 of the filter 11. In this case, when performing the residual ascites recovery step, for example, the first pump 51 is stopped, the third valve 70 is closed, and the second valve 50 is opened, and the second pump 60 is operated, and the air is sucked and introduced from the gas introduction part 53 through the liquid passage port 11c into the secondary space 30b of the filter 11. As a result, the ascites remaining in the secondary space 30b of the filter 11 and downstream thereof, i.e., the secondary space 30b of the filter 11, the second liquid supply line 15, the primary space 40a of the concentrator 12, and the third liquid supply line 16, is pushed by the atmosphere and collected in the concentrated ascites bag 13.

[0051] The ascites treatment system 1 in the above embodiment may not include the fifth liquid supply line 18 and may not perform re-concentration treatment. The backflow prevention unit provided in the fourth liquid supply line 17 is not limited to the check valve 65, and may be another device that can prevent backflow to the concentrator 12.

[0052] In the above embodiment, the first liquid feed line 14 and the sixth liquid feed line 19 are connected to the inner region of the filtration membrane 30 of the filter 11, and the second liquid feed line 15 is connected to the outer region of the filtration membrane 30, but the reverse may be true, that is, the first liquid feed line 14 and the sixth liquid feed line 19 are connected to the outer region of the filtration membrane 30 of the filter 11, and the second liquid feed line 15 may be connected to the inner region of the filtration membrane 30. Also, the second liquid feed line 15 and the third liquid feed line 16 are connected to the inner region of the concentration membrane 40 of the concentrator 12, and the fourth liquid feed line 17 is connected to the outer region of the concentration membrane 40 of the concentrator 12, but the reverse may be true, that is, the second liquid feed line 15 and the third liquid feed line 16 are connected to the outer region of the concentration membrane 40 of the concentrator 12, and the fourth liquid feed line 17 is connected to the inner region of the concentration membrane 40 of the concentrator 12. The filter 11 and the concentrator 12 may be installed upside down. That is, the filter 11 may be installed so that the inlet 11a faces downward and the outlet 11b faces upward, and the concentrator 12 may be installed so that the inlet 12a faces downward and the outlet 12b faces upward.

[0053] The above embodiment is an example in which the present invention is applied to an ascites treatment system 1 that treats ascites, but the present invention can also be applied to a body cavity fluid treatment system that treats other body cavity fluids such as pleural fluid. [Industrial Applicability]

[0054] INDUSTRIAL APPLICABILITY The present invention is useful in suppressing an increase in pressure in a concentrator when recovering body cavity fluid remaining in a line in a body cavity fluid treatment system. [Explanation of symbols]

[0055] 1. Ascites treatment system 10 Ascites Bag 11 Filter 12 Concentrator 13 Concentrated ascites bag 14 First liquid delivery line 15 Second liquid delivery line 16 Third delivery line 17 Fourth delivery line 18 5th delivery line 19 6th liquid delivery line 20 Control section 40 Concentrator membrane 51 First Pump 53 Gas introduction section 60 Second Pump 65 Check valve

Claims

1. A body cavity fluid treatment system for treating body cavity fluid, comprising: A storage section for storing body cavity fluid; A filter and A concentrator; a collection section for collecting body cavity fluid; a first fluid supply line that supplies the body cavity fluid in the storage portion to the filter; a second fluid delivery line for delivering the body cavity fluid filtered by the filter to the concentrator; a third fluid delivery line for delivering the body cavity fluid concentrated by the concentrator to the collection section; a fourth liquid delivery line for discharging the waste liquid removed by the concentrator; a first pump provided in the first liquid supply line or the second liquid supply line; a second pump provided in the third liquid supply line; a gas introduction portion capable of introducing a gas into a gas introduction position provided in the second liquid delivery line or the filter downstream of the first pump; a backflow prevention unit provided in the fourth liquid sending line to prevent backflow to the concentrator; a control unit that executes a recovery process of stopping the first pump and operating the second pump to introduce gas from the gas introduction section and recovering body cavity fluid downstream of the gas introduction position in the recovery section.

2. The body cavity fluid processing system of claim 1, wherein the control unit operates the first pump and the second pump before the recovery process to perform a pre-process of moving the filtered body cavity fluid in the filter downstream of a gas introduction position in the second fluid delivery line.

3. The first pump is provided on the second liquid supply line, The body cavity fluid treatment system further includes a fifth fluid supply line that supplies the body cavity fluid in the recovery section to a joining position upstream of the first pump in the second fluid supply line, The body cavity fluid processing system of claim 2, wherein the control unit, after the recovery process, stops the second pump, operates the first pump in the reverse direction to that during processing, introduces gas from the gas introduction section, and performs a subsequent process of recovering the body cavity fluid in the fifth fluid delivery line to the recovery section.

4. A method of using a body cavity fluid treatment system for treating body cavity fluid, comprising: A storage section for storing body cavity fluid; A filter and A concentrator; a collection section for collecting body cavity fluid; a first fluid supply line that supplies the body cavity fluid in the storage portion to the filter; a second fluid delivery line for delivering the body cavity fluid filtered by the filter to the concentrator; a third fluid delivery line for delivering the body cavity fluid concentrated by the concentrator to the collection section; a fourth liquid delivery line for discharging the waste liquid removed by the concentrator; a first pump provided in the first liquid supply line or the second liquid supply line; a second pump provided in the third liquid supply line; a gas introduction portion capable of introducing a gas into a gas introduction position provided in the second liquid delivery line or the filter downstream of the first pump; a backflow prevention unit provided in the fourth fluid supply line to prevent backflow to the concentrator, A method of using a body cavity fluid processing system, comprising: stopping the first pump, activating the second pump, introducing gas from the gas introduction section, and executing a recovery process of recovering body cavity fluid downstream of the gas introduction position in the recovery section.

5. A method of using the body cavity fluid processing system described in claim 4, further comprising the steps of: operating the first pump and the second pump prior to the recovery step; and performing a pre-step of moving the filtered body cavity fluid in the filter downstream of a gas introduction position in the second fluid supply line.

6. The first pump is provided on the second liquid supply line, the body cavity fluid treatment system further includes a fifth fluid supply line that supplies the body cavity fluid in the recovery section to a joining position upstream of the first pump in the second fluid supply line; A method of using the body cavity fluid processing system described in claim 5, further comprising the steps of: stopping the second pump after the recovery step; operating the first pump in the reverse direction to that during processing; and introducing gas from the gas introduction section to recover the body cavity fluid in the fifth fluid supply line to the recovery section.

Images