Peritoneal dialysis device

Abstract

To provide a peritoneal dialyzer capable of warming a dialysate to a prescribed target temperature stably, even a liquid amount of the dialysate in a warming part is reduced.SOLUTION: A peritoneal dialyzer 1 comprises: a liquid feeding part 100 feeding a dialysate; a warming part 130 having a heater 132 for warming the dialysate; a temperature measuring part 140 for measuring temperature of the dialysate in the warming part 130; and a control part 160 for controlling the warming part 130. The control part 160 comprises: a liquid amount monitoring part 161 for monitoring a liquid amount of the dialysate in the warming part 130: a first output adjusting part 162 for adjusting an output ratio of the heater 132 according to the liquid amount of the dialysate on the warming part 130; and a warming control part 164 for driving the heater 132 when the measured temperature of the dialysate measured by the temperature measuring part 140 is lower than the predetermined target temperature. The warming control part 164 controls output of the heater 132 by an output ratio by the first output adjusting part 162.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a peritoneal dialysis device having a heating unit for heating dialysis fluid.

Background Art

[0002] Conventionally, as one of blood purification therapies, peritoneal dialysis is performed in which dialysis fluid is injected into a patient's abdominal cavity and, after a predetermined period of time has elapsed, the injected dialysis fluid is discharged to discharge waste products and the like contained in the blood outside the body. A peritoneal dialysis device that automatically performs peritoneal dialysis has a heating unit that preheats and keeps warm dialysis fluid to a predetermined temperature around body temperature, which is directly injected into a patient's body. The heater provided in the heating unit has its output adjusted based on the temperature information of the dialysis fluid measured by a temperature sensor, and the dialysis fluid is heated to and kept at a predetermined temperature (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As the dialysis fluid heated to a predetermined temperature is injected into a patient, the amount of fluid in the heating unit decreases. Therefore, when the output of the heater is adjusted based on the temperature information of the dialysis fluid, the temperature of the dialysis fluid in the heating unit may rise too much. When the temperature of the dialysis fluid rises above the predetermined temperature, it is necessary to stop the injection operation into the patient and wait until the dialysis fluid reaches the predetermined temperature range, which prolongs the treatment time.

[0005] Accordingly, an object of the present invention is to provide a peritoneal dialysis device that can stably heat dialysis fluid to a predetermined target temperature even when the amount of dialysis fluid in the heating unit decreases.

Means for Solving the Problems

[0006] The present invention relates to a peritoneal dialysis device including a liquid delivery unit for delivering dialysis fluid, a heating unit having a heater for heating the dialysis fluid, a temperature measurement unit for measuring the temperature of the dialysis fluid in the heating unit, and a control unit for controlling the heating unit. The control unit includes a liquid volume monitoring unit for monitoring the liquid volume of the dialysis fluid in the heating unit, a first output adjustment unit for adjusting the output ratio of the heater according to the liquid volume of the dialysis fluid in the heating unit, and a heating control unit for driving the heater when the measured temperature of the dialysis fluid measured by the temperature measurement unit is lower than a predetermined target temperature. The heating control unit controls the output of the heater at the output ratio by the first output adjustment unit.

[0007] Further, when the liquid volume of the dialysis fluid in the heating unit is equal to or more than a predetermined liquid volume, the first output adjustment unit preferably sets the output ratio of the heater to 1, and when the liquid volume of the dialysis fluid in the heating unit is less than the predetermined liquid volume, the first output adjustment unit preferably decreases the output ratio of the heater from 1 according to the decrease in the liquid volume of the dialysis fluid in the heating unit.

[0008] Further, when the liquid volume of the dialysis fluid monitored by the liquid volume monitoring unit is increasing, the first output adjustment unit preferably sets the output ratio of the heater to 1 regardless of the liquid volume of the dialysis fluid.

[0009] The control unit further includes a second output adjustment unit for adjusting the output ratio of the heater according to the temperature difference between the measured temperature and the predetermined target temperature. The heating control unit preferably controls the output of the heater at a ratio obtained by multiplying the output ratio by the first output adjustment unit and the output ratio by the second output adjustment unit.

[0010] Further, when the temperature difference exceeds a predetermined value, the second output adjustment unit preferably sets the output ratio of the heater to 1, and when the temperature difference is equal to or less than the predetermined value, the second output adjustment unit preferably decreases the output ratio of the heater from 1 according to the decrease in the temperature difference.

[0011] Further, when the temperature difference exceeds a predetermined value, it is preferable that the first output adjuster sets the output ratio of the heater to 1 regardless of the amount of the dialysate in the heating unit.

[0012] Also, it is preferable that the liquid amount monitoring unit calculates the amount of the dialysate in the heating unit based on the liquid feeding amount of the liquid feeding unit.

[0013] Further, the liquid feeding unit includes a liquid feeding / draining cassette including a pump chamber having a diaphragm and a liquid feeding opening through which liquid can enter and exit, and a tube having one end connected to the liquid feeding opening and the other end branched and connected to a liquid supply source and a liquid supply destination respectively, a driving means for reciprocally driving the diaphragm with a constant stroke width, and a flow path opening / closing mechanism for opening and closing the flow paths on the branched other end side of the tube respectively. It is preferable that the liquid feeding amount of the liquid feeding unit is calculated by multiplying the capacity of the pump chamber by the number of driving times of the driving means.

Advantages of the Invention

[0014] According to the peritoneal dialysis device of the present invention, by adjusting the output ratio of the heating unit according to the amount of the dialysate in the heating unit, the dialysate can be stably heated, so that the occurrence of interruption of the liquid injection operation can be suppressed, and the extension of the treatment time can be suppressed.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0016] Hereinafter, a preferred embodiment of the peritoneal dialysis device of the present invention will be described with reference to the drawings. First, the configuration of the peritoneal dialysis device 1 of the present embodiment will be described with reference to FIGS. 1 and 2.

[0017] The peritoneal dialysis device 1 according to this embodiment is used when performing peritoneal dialysis on a patient with renal failure. The peritoneal dialysis device 1 injects dialysate into the patient's abdominal cavity, stores the dialysate in the abdominal cavity for a certain period of time, and then discharges the dialysate mixed with waste products in the body. The patient repeats the cycle composed of the above-mentioned liquid injection, storage, and drainage multiple times a day using this peritoneal dialysis device 1.

[0018] As shown in FIGS. 1 and 2, the peritoneal dialysis device 1 includes a device main body 180, a liquid feeding / draining cassette 10 that sucks and delivers a certain amount of dialysate attached to the device main body 180, a driving means 110 that operates the liquid feeding / draining cassette 10, a flow path opening / closing mechanism 120 that opens and closes the flow path of the liquid feeding / draining cassette 10, a warming unit 130 that warms the dialysate bag, a temperature measuring unit 140, an operation unit 150, a control unit 160, and a data storage unit 170. The liquid feeding / draining cassette 10, the driving means 110, and the flow path opening / closing mechanism 120 constitute a liquid feeding unit 100.

[0019] As shown in FIG. 1, the device main body 180 constitutes the outer shape of the peritoneal dialysis device 1 and includes a cassette mounting portion 182 and a cassette lid portion 183.

[0020] The liquid feeding / draining cassette 10 is configured to be detachable from the cassette mounting portion 182. The liquid feeding / draining cassette 10 includes a chamber 11 and a tube 13. The cassette lid portion 183 is attached to the cassette mounting portion 182 so as to be openable and closable, and covers the liquid feeding / draining cassette 10 mounted on the cassette mounting portion 182.

[0021] The chamber 11 is made of a hard synthetic resin having light transmissivity (for example, hard polyvinyl chloride) and is formed with a predetermined capacity (for example, 50 mL). The chamber 11 is formed with a predetermined capacity by bonding a first semi-spherical member 14A and a second semi-spherical member 14B that are parts of the same spherical shape.

[0022] The diaphragm 12 is an elastic membrane member, which is formed of a synthetic resin material such as silicone, vinyl chloride resin, natural rubber, thermoplastic elastomer, etc., and has a thickness of about 0.2 to 0.5 mm. The inside of the chamber 11 is partitioned by the diaphragm 12 into a pump chamber 11A and a pressure chamber 11B.

[0023] At the center of the spherical surface of the first semi-spherical member 14A that constitutes the pump chamber 11A, a liquid supply opening 14a through which the liquid to be transferred can enter and exit is formed. At the center of the spherical surface of the second semi-spherical member 14B that constitutes the pressure chamber 11B, an application opening 14b through which the working fluid from the driving means 110 described later can enter and exit is formed.

[0024] The tube 13 has a non-branching portion 15 and a branching portion 16, and the end (one end) on the non-branching portion 15 side is connected to the liquid supply opening 14a of the pump chamber 11A. Then, the other end of the non-branching portion 15 branches into the branching portion 16, which is respectively connected to the liquid supply source and the liquid supply destination. The tube 13 is composed of a synthetic resin (for example, soft polyvinyl chloride) having flexibility and light transmissibility. The non-branching portion 15 and the branching portion 16 of the tube may be integrally formed, or a plurality of tubes may be connected via a connecting member. The tube 13 is formed by connecting the non-branching portion 15 of the tube and a plurality of tubes 16a, 16b, 16c, 16d, 16e that constitute the branching portion 16 of the tube.

[0025] The tubes 16a to 16e are respectively connected to a dialysate supply source (the heating dialysate bag 190a, the replenishing dialysate bag 190b, the concentration-changing dialysate bag 190c described later), a dialysate delivery destination (inside the patient P's abdominal cavity, the drainage bag 190e), and a dialysate delivery source (inside the patient P's abdominal cavity).

[0026] The tube 16a is connected to the heating dialysis fluid bag 190a placed on the heating unit 130. The tube 16b is connected to the supplementary dialysis fluid bag 190b (in this embodiment, three supplementary dialysis fluid bags 190b). The tube 16c is connected to the concentration-changing dialysis fluid bag 190c containing a dialysis fluid with a concentration different from that of the dialysis fluid contained in the supplementary dialysis fluid bag 190b. The tube 16d is connected to the abdominal cavity of the patient P to inject dialysis fluid into the abdominal cavity of the patient P and discharge the dialysis fluid (dialysis drainage fluid) injected into the abdominal cavity of the patient P. The tube 16e is connected to the drainage bag 190e for storing the drainage fluid. In addition, each tube is connected to a bag or the like directly or via a connecting member.

[0027] The driving means 110 includes a pump 111 for supplying and discharging fluid to and from the pressure chamber 11B to apply pressure, and a driver 112 as a driving source for driving the pump 111, and reciprocally drives the diaphragm 12 with a constant stroke width.

[0028] The pump 111 may be of any type as long as it can alternately apply positive pressure and negative pressure to the pressure chamber 11B. In this embodiment, a pump 111 composed of a cylinder 111a and a piston 111b is used. The pump 111 applies positive pressure or negative pressure to the pressure chamber 11B through the air tube 114 and the application opening 14b by driving the piston by the driver 112, and drives the diaphragm 12.

[0029] The air tube 114 connecting the cylinder 111a and the pressure chamber 11B is provided with a valve 115 and a pressure sensor 116 at a branched portion in the middle thereof. The valve 115 is driven in response to feedback from the pressure sensor 116 so that excessive pressure is not applied to the pressure chamber 11B. As the valve 115, for example, a known diaphragm type electromagnetic valve or the like is used, and as the pressure sensor 116, for example, a piezoelectric element or a semiconductor pressure sensor using the piezoresistive effect is used.

[0030] The flow path opening and closing mechanism 120 includes a clamp portion 121 disposed for each of the five tubes 16a to 16e, and a drive source (not shown) for driving these clamp portions 121. The clamp portion 121 is provided on the other end side (branch portion 16 side) of the branched tube 13, opens and closes the branched flow paths respectively, and changes the communication state between the pump chamber 11A, the liquid supply source, and the liquid supply destination.

[0031] The heating unit 130 is provided on the upper surface portion of the apparatus main body 180. The heating unit 130 includes a placement portion 131 on which the heating dialysis fluid bag 190a containing the dialysis fluid is placed, and a heater 132 for heating the heating dialysis fluid bag 190a. The heater 132 is composed of a heating element such as a ceramic heater, for example, and the output ratio of its drive is controlled by an ON / OFF control method, an inverter control method, or the like. The heating unit 130 heats the dialysis fluid in the heating dialysis fluid bag 190a placed on the placement portion 131 to a predetermined temperature through the bag by the heater 132.

[0032] The temperature measurement unit 140 is disposed on the placement portion 131 (see FIG. 1) and measures the temperature of the dialysis fluid in the heating dialysis fluid bag 190a through the bag.

[0033] The operation unit 150 is configured to include a liquid crystal panel and various operation buttons. Various information such as the liquid feeding amount of the dialysis fluid is displayed on the liquid crystal panel.

[0034] The control unit 160 controls the driving of the driving means 110 and the flow path opening and closing mechanism 120 based on the data stored in the data storage unit 170 and the input data from the operation unit 150. The control unit 160 includes a liquid volume monitoring unit 161, a first output adjustment unit 162, a second output adjustment unit 163, and a heating control unit 164, and drives and adjusts the output of the heater 132 of the heating unit 130. The control method of the heating unit 130 by the liquid volume monitoring unit 161, the first output adjustment unit 162, the second output adjustment unit 163, and the heating control unit 164 will be described in detail later.

[0035] Next, an example of the operation of the peritoneal dialysis apparatus 1 described above will be explained. The peritoneal dialysis device 1 first sends a predetermined amount of dialysate from the supplementary dialysate bag 190b to the warmed dialysate bag 190a to warm the dialysate to a predetermined temperature (warming step). Then, the dialysate in the warmed dialysate bag 190a that has been warmed to the appropriate temperature is injected into the abdominal cavity of the patient P (injection step). After the dialysate has been stored in the abdominal cavity of the patient P for a certain period of time, the dialysate is drained (draining step). Also, after injecting the dialysate into the abdominal cavity of the patient P, while the dialysate is being stored in the abdominal cavity of the patient P, the warming step is performed in preparation for the next injection step.

[0036] (warming step) A method for sending the dialysate from the supplementary dialysate bag 190b to the warmed dialysate bag 190a will be described. The peritoneal dialysis device 1 opens the flow path of a predetermined single tube (for example, tube 16b) by the flow path opening / closing mechanism 120, closes the flow paths of the other tubes, and sucks the air in the pressure chamber 11B of the chamber 11 by the pump 111, and sucks the dialysate (in this case, the dialysate stored in the supplementary dialysate bag 190b) from the tube with the open flow path into the pump chamber 11A of the chamber 11. Next, the flow path opening / closing mechanism 120 is operated to change the tube whose flow path is opened (for example, open the flow path of tube 16a and close the flow paths of the other tubes). In this state, by introducing air into the pressure chamber 11B of the chamber 11, the dialysate sucked into the pump chamber 11A of the chamber 11 is sent out (in this case, the dialysate is sent out to the warmed dialysate bag 190a). As a result, a certain amount (the volume of the chamber 11) of dialysate is sucked and sent out. By repeating this, the dialysate with a capacity that can be accommodated in the warmed dialysate bag 190a (for example, 2L to 3L) is sent from the supplementary dialysate bag 190b to the warmed dialysate bag 190a. After the dialysate with the accommodable amount has been sent or during the sending of the dialysate, the dialysate is warmed by the warming unit 130.

[0037] (injection step) A method of injecting dialysis fluid into patient P will be described. The peritoneal dialysis device 1 opens the flow path of a predetermined single tube (for example, tube 16a) by the flow path opening / closing mechanism 120 and closes the flow paths of the other tubes. In this state, the air in the pressure chamber 11B of the chamber 11 is sucked by the pump 111, and the dialysis fluid (in this case, the dialysis fluid stored in the dialysis fluid warming bag 190a) is sucked from the tube with the open flow path into the pump chamber 11A of the chamber 11. Next, the flow path opening / closing mechanism 120 is operated to change the tube with the open flow path (for example, open the flow path of tube 16d and close the flow paths of the other tubes). In this state, by introducing air into the pressure chamber 11B of the chamber 11, the dialysis fluid sucked into the pump chamber 11A of the chamber 11 is delivered (in this case, the dialysis fluid is delivered into the abdominal cavity of patient P). As a result, a fixed amount (the volume of the chamber 11) of dialysis fluid is sucked and delivered.

[0038] (Drainage process) A method of draining the dialysis fluid stored in the abdominal cavity of patient P for a certain period of time will be described. The peritoneal dialysis device 1 opens the flow path of a predetermined single tube (for example, tube 16d) by the flow path opening / closing mechanism 120 and closes the flow paths of the other tubes. In this state, the air in the pressure chamber 11B of the chamber 11 is sucked by the pump 111, and the dialysis fluid (in this case, the dialysis fluid in the abdominal cavity of patient P) is sucked from the tube with the open flow path into the pump chamber 11A of the chamber 11. Next, the flow path opening / closing mechanism 120 is operated to change the tube with the open flow path (for example, open the flow path of tube 16e and close the flow paths of the other tubes). In this state, by introducing air into the pressure chamber 11B of the chamber 11, the dialysis fluid sucked into the pump chamber 11A of the chamber 11 is delivered (in this case, the dialysis fluid is discharged into the drainage bag 190e). As a result, a fixed amount (the volume of the chamber 11) of dialysis fluid is sucked and delivered.

[0039] As described above, by repeating the above operations while changing the tube that opens the flow path by the flow path opening / closing mechanism 120, a liquid injection step of injecting the dialysate heated in the heating step into the abdominal cavity of the patient P, a drainage step of collecting the dialysate from the abdominal cavity of the patient P and discharging the collected dialysate to the drainage bag 190e, are performed.

[0040] Next, a control method of the heating unit 130 will be described in detail. In the heating step and the liquid injection step, the control unit 160 controls the heating unit 130 so that the dialysate stored in the heating dialysate bag 190a is heated to a predetermined temperature and is within a predetermined temperature range. In the present embodiment, as a configuration for preferably controlling the temperature of the dialysate in the heating unit 130, the control unit 160 includes a liquid volume monitoring unit 161, a first output adjustment unit 162, a second output adjustment unit 163, and a heating control unit 164.

[0041] The liquid volume monitoring unit 161 monitors the liquid volume of the dialysate in the heating unit 130 (the liquid volume in the heating dialysate bag 190a) by measurement or calculation. In the present embodiment, the liquid volume monitoring unit 161 calculates the liquid volume of the dialysate in the heating unit 130 based on the liquid feeding amount of the liquid feeding unit 100. Specifically, the liquid volume monitoring unit 161 calculates the liquid volume of the dialysate in the heating unit 130 by multiplying the capacity of the pump chamber 11A by the number of driving times of the driving means 110. Note that the liquid volume of the dialysate in the heating unit 130 may be measured by providing a weighing scale in the heating unit 130.

[0042] The first output adjustment unit 162 adjusts the output ratio of the driving of the heater 132 based on the liquid volume of the dialysate in the heating unit 130 obtained by the liquid volume monitoring unit 161. In the present embodiment, when the liquid volume of the dialysate in the heating unit 130 is equal to or more than a predetermined liquid volume, the first output adjustment unit 162 sets the output ratio of the heater 132 to 1, and when the liquid volume of the dialysate in the heating unit 130 is less than the predetermined liquid volume, the first output adjustment unit 162 decreases the output ratio of the heater 132 from 1 in accordance with the decrease in the liquid volume of the dialysate in the heating unit 130. Further, when the temperature difference between the measured temperature of the dialysate in the heating unit 130 and a preset target temperature exceeds a predetermined value, the first output adjustment unit 162 sets the output ratio of the heater 132 to 1 regardless of the amount of the dialysate in the heating unit 130. Also, when the amount of the dialysate monitored by the liquid amount monitoring unit 161 is increasing, the first output adjustment unit 162 sets the output ratio of the heater 132 to 1 regardless of the amount of the dialysate.

[0043] The second output adjustment unit 163 adjusts the output ratio of the drive of the heater 132 based on the temperature difference between the measured temperature and the target temperature of the dialysate in the heating unit 130. In the present embodiment, when the temperature difference between the measured temperature of the dialysate in the heating unit 130 and a preset target temperature exceeds a predetermined value, the second output adjustment unit 163 sets the output ratio of the heater 132 to 1, and when the temperature difference is equal to or less than the predetermined value, the second output adjustment unit 163 decreases the output ratio of the heater 132 from 1 in response to the decrease in the temperature difference.

[0044] The heating control unit 164 controls the heater 132 based on the measured temperature of the dialysate measured by the temperature measurement unit 140. Specifically, when the measured temperature of the dialysate measured by the temperature measurement unit 140 is lower than a preset target temperature, the heating control unit 164 drives the heater 132. The output ratio of the drive of the heater 132 is adjusted by the first output adjustment unit 162 and the second output adjustment unit 163. More specifically, the output ratio of the drive of the heater 132 is adjusted to a ratio obtained by multiplying the output ratio by the first output adjustment unit 162 and the output ratio by the second output adjustment unit 163.

[0045] First, the control of the heating unit 130 in the heating step will be described. In the heating step, after the feeding of a predetermined amount (the amount that can be accommodated, 3L in this embodiment as an example) of the dialysate to the heating dialysate bag 190a is completed, or during the feeding of the dialysate to the heating dialysate bag 190a, the heating control unit 164 drives the heater 132 of the heating unit 130 in a state where the measured temperature of the dialysate is lower than the target temperature.

[0046] When the control by the heating control unit 164 starts after the feeding of a predetermined amount (the maximum capacity, which is 3L in this embodiment as an example) of dialysate into the dialysate bag 190a for heating is completed, the liquid volume of the dialysate in the heating unit 130 is equal to or more than a predetermined liquid volume, and the output ratio of the heater 132 by the first output adjustment unit 162 is set to 1. Therefore, the output ratio of the heater 132 in this case is determined by the second output adjustment unit 163.

[0047] The second output adjustment unit 163 adjusts the output ratio of the heater 132 according to the temperature difference between a target temperature (a temperature near body temperature, for example, 37°C) and the measured temperature of the dialysate measured by the temperature measurement unit 140. In this embodiment, as an example, when the temperature difference between the measured temperature and the target temperature exceeds a predetermined value (for example, 1.5°C) (when the temperature of the dialysate is low), the output ratio is set to 1; when the temperature difference is within a predetermined range (for example, 0.5°C or more and 1.5°C or less), the output ratio is set to 1 / 3; and when the temperature difference is less than a predetermined value (for example, 0.5°C), the output ratio is set to 0. Also, in this embodiment, an ON / OFF control method that repeats the ON / OFF driving of the heater 132 is used. As an example, the time for driving the heater 132 to be ON is set to 1 second, and the time for driving it to be OFF is set to 2 seconds, and this is repeated to set the output ratio to 1 / 3.

[0048] Next, the control of the heating unit 130 in the liquid injection process will be described. In the liquid injection process, the control unit 160 controls the flow path opening / closing mechanism 120 and the pump 111 to control the injection of the dialysate heated to an appropriate temperature into the abdominal cavity of the patient P.

[0049] The heating control unit 164 adjusts the output of the heater 132 by the second output adjustment unit 163 also in the liquid injection process in the same manner as in the heating process. However, as the liquid injection process progresses, the liquid volume of the dialysate in the heating unit 130 decreases. Therefore, if only the adjustment by the second output adjustment unit 163 based on the temperature difference is performed, the output of the heater 132 may be too large with respect to the liquid volume, and the temperature of the dialysate in the heating unit 130 may rise excessively beyond the predetermined target temperature.

[0050] Therefore, in the present embodiment, in the first output adjustment unit 162, the output ratio of the heater 132 is adjusted according to the amount of dialysate in the heating unit 130. Specifically, when the amount of dialysate in the heating unit 130 is equal to or greater than a predetermined amount (for example, 2L with respect to the maximum capacity of 3L of the dialysate bag 190a for heating), the first output adjustment unit 162 sets the output ratio of the heater 132 to 1. When the amount is less than the predetermined amount (2L), the output ratio of the heater 132 is decreased from 1 in accordance with the decrease in the amount of dialysate, thereby adjusting the output ratio of the heater 132. As a result, when the amount of dialysate in the heating unit 130 decreases, the output ratio of the heater 132 can be decreased, so that it is possible to reduce the overheating of the dialysate beyond a predetermined temperature and stably heat the dialysate to a predetermined target temperature.

[0051] In addition, during the heating process or the liquid injection process, if for some reason the heating by the heating unit 130 is interrupted and the temperature difference between the measured temperature of the dialysate in the heating unit 130 and the predetermined target temperature exceeds the aforementioned predetermined value (for example, 1.5°C), the first output adjustment unit 162 sets the output ratio of the heater 132 to 1 regardless of the amount of dialysate in the heating unit 130. Thus, when the output ratio by the second output adjustment unit 163 is 1, by setting the output ratio by the first output adjustment unit 162 to 1 as well, the dialysate can be quickly heated to a predetermined temperature.

[0052] When the control by the heating control unit 164 is started during the feeding of the dialysate to the dialysate bag 190a for heating, the amount of dialysate monitored by the liquid amount monitoring unit 161 increases with the passage of time. In this case, the first output adjustment unit 162 sets the output ratio of the heater 132 to 1 regardless of the amount of dialysate. As a result, in the state where the dialysate is being fed to the dialysate bag 190a for heating in the heating process, the dialysate can be quickly heated to an appropriate temperature. Therefore, the time required for heating in the heating process can be shortened, so that the waiting time until the liquid injection process can be shortened, and the treatment time can be shortened.

[0053] According to the peritoneal dialysis device 1 and its control method of the present embodiment described above, the following effects are achieved.

[0054] (1) The peritoneal dialysis device 1 is configured to include a liquid feeding unit 100, a heating unit 130 having a heater 132, a temperature measuring unit 140 for measuring the temperature of the dialysate in the heating unit, and a control unit 160 for controlling the heating unit 130. The control unit 160 includes a liquid volume monitoring unit 161 for monitoring the liquid volume of the dialysate in the heating unit 130, a first output adjustment unit 162 for adjusting the output ratio of the heater 132 according to the liquid volume of the dialysate in the heating unit 130, and a heating control unit 164 for driving the heater 132 when the measured temperature of the dialysate measured by the temperature measuring unit 140 is lower than a predetermined target temperature. Then, the heating control unit 164 is controlled to output the heater 132 at the output ratio by the first output adjustment unit 162. Thereby, since the output of the heater 132 can be adjusted according to the liquid volume of the dialysate, the dialysate can be heated stably. Therefore, in the liquid injection process in which the liquid volume of the dialysate in the heating unit 130 decreases, the occurrence of interruption of the liquid injection operation due to excessive increase in the temperature of the dialysate can be reduced, and the extension of the treatment time can be suppressed.

[0055] (2) When the liquid volume of the dialysate in the heating unit 130 is equal to or more than a predetermined liquid volume, the first output adjustment unit 162 sets the output ratio of the heater 132 to 1, and when it is less than the predetermined liquid volume, the output ratio of the heater 132 is decreased from 1 according to the decrease in the liquid volume of the dialysate in the heating unit 130. Thereby, when the liquid volume is larger than the predetermined liquid volume, the output of the heater 132 is maximized to quickly heat the dialysate, and at the same time, heat preservation is performed with appropriate output adjustment. Also, when the liquid volume decreases to less than the predetermined liquid volume, the output of the heater 132 is decreased according to the liquid volume, so that the temperature can be prevented from rising too much and the dialysate can be heated stably. Therefore, the time required for the heating process can be shortened, and in the liquid injection process, the dialysate can be appropriately kept warm, so that the extension of the treatment time can be suppressed.

[0056] (3) When the liquid volume of the dialysate monitored by the liquid volume monitoring unit 161 increases in the first output adjustment unit 162, the output ratio of the heater 132 is set to 1 regardless of the liquid volume of the dialysate. As a result, in a state where the dialysate is being fed to the heating dialysate bag 190a in the heating step, the dialysate can be quickly heated to the appropriate temperature. Therefore, the time related to heating in the heating step can be shortened, so the waiting time until the liquid injection step can be shortened, and the treatment time can be shortened.

[0057] (4) The control unit 160 is configured to include a second output adjustment unit 163 that adjusts the output ratio of the heater 132 according to the temperature difference between the measured temperature and a predetermined target temperature. The heating control unit 164 is made to control the output of the heater 132 at a ratio obtained by multiplying the output ratio by the first output adjustment unit 162 and the output ratio by the second output adjustment unit 163. Thereby, since the output ratio of the heater 132 is adjusted based on both the measured temperature of the dialysate and the liquid volume of the dialysate, the dialysate can be more stably heated to the predetermined target temperature.

[0058] (5) In the second output adjustment unit 163, when the temperature difference exceeds a predetermined value, the output ratio of the heater 132 is set to 1. When the temperature difference is equal to or less than the predetermined value, the output ratio of the heater 132 is decreased from 1 in accordance with the decrease in the temperature difference. Thereby, since the output ratio of the heater 132 can be adjusted in multiple stages according to the temperature difference between the measured temperature of the dialysate and the predetermined target temperature in the heating unit 130, the dialysate can be more stably heated to the predetermined target temperature.

[0059] (6) In the first output adjustment unit 162, when the temperature difference exceeds a predetermined value, the output ratio of the heater 132 is set to 1 regardless of the liquid volume of the dialysate in the heating unit 130. Thereby, in the case where the output ratio by the second output adjustment unit 163 becomes 1, by setting the output ratio by the first output adjustment unit 162 to 1 as well, the dialysate can be quickly heated to the predetermined temperature.

[0060] (7) The liquid volume monitoring unit 161 calculates the liquid volume of the dialysate in the heating unit 130 based on the liquid delivery volume of the liquid delivery unit 100. As a result, the liquid volume of the dialysate in the heating unit 130 can be calculated without separately providing a weighing scale or the like in the heating unit 130.

[0061] (8) The liquid delivery unit 1 is configured to include a liquid delivery and drainage cassette 10 including a pump chamber 11A having a diaphragm 12 and a liquid delivery opening 14a through which liquid can enter and exit, a tube 13 having one end connected to the liquid delivery opening 14a and the other end branched and connected to a liquid supply source and a liquid supply destination respectively, a driving means 110 for reciprocally driving the diaphragm 12 with a constant stroke width, and a flow path opening and closing mechanism 120 for opening and closing the flow paths on the branched other end side of the tube 13 respectively. The liquid delivery volume of the liquid delivery unit 100 is calculated by multiplying the capacity of the pump chamber 11A by the number of driving times of the driving means 110. As a result, the liquid delivery volume by the liquid delivery unit 100 can be easily calculated. Therefore, the liquid volume monitoring unit 161 can easily calculate the liquid volume of the dialysate in the heating unit 130.

[0062] As described above, the preferred embodiments of the peritoneal dialysis device 1 of the present invention have been described. However, the present invention is not limited to the above-described embodiments and can be appropriately modified. For example, in the above-described embodiment, the second output adjustment unit 163 adjusts the output ratio in three steps (1, 1 / 3, 0) according to the temperature difference between the predetermined target temperature and the measured temperature of the dialysate, but it is not limited to this. For example, the output ratio may be adjusted in more fine and multi-steps according to the temperature difference, or may be adjusted only by ON / OFF (1, 0).

[0063] Also, in the present embodiment, the case where the output of the heater 132 is adjusted in multiple steps by the second output adjustment unit 163 is shown as an example. However, in the second output adjustment unit 163, when the temperature of the dialysate in the heating unit 130 is lower than the predetermined target temperature, the output of the heater 132 may be turned on, and when it is equal to or higher than the predetermined target temperature, the output of the heater 132 may be turned off for control.

Explanation of reference numerals

[0064] 1 Peritoneal dialysis device 10 Liquid supply and drainage cassette 100 Liquid supply section 110 Driving means 120 Flow path opening and closing mechanism 130 Heating section 132 Heater 140 Temperature measurement section 150 Operation section 160 Control section 161 Liquid volume monitoring section 162 First output adjustment section 163 Second output adjustment section 164 Heating control section 170 Data storage section 180 Device main body

Claims

1. A liquid delivery unit for transferring dialysis fluid, A heating unit having a heater for heating the dialysis fluid, A temperature measurement unit for measuring the temperature of the dialysis fluid in the heating unit, A control unit for controlling the heating unit, and comprising: The control unit, A liquid volume monitoring unit for monitoring the liquid volume of the dialysis fluid in the heating unit, A first output adjustment unit for adjusting the output ratio of the heater according to the liquid volume of the dialysis fluid in the heating unit, A heating control unit for driving the heater when the measured temperature of the dialysis fluid measured by the temperature measurement unit is lower than a predetermined target temperature, and comprising: The peritoneal dialysis device in which the heating control unit controls the output of the heater at the output ratio by the first output adjustment unit.

2. When the liquid volume of the dialysis fluid in the heating unit is equal to or more than a predetermined liquid volume, the first output adjustment unit sets the output ratio of the heater to 1, and when the liquid volume of the dialysis fluid in the heating unit is less than the predetermined liquid volume, the first output adjustment unit decreases the output ratio of the heater from 1 according to the decrease in the liquid volume of the dialysis fluid in the heating unit. The peritoneal dialysis device according to Claim 1.

3. When the liquid volume of the dialysis fluid monitored by the liquid volume monitoring unit is increasing, the first output adjustment unit sets the output ratio of the heater to 1 regardless of the liquid volume of the dialysis fluid. The peritoneal dialysis device according to Claim 1 or 2.

4. The control unit further comprises a second output adjustment unit for adjusting the output ratio of the heater according to the temperature difference between the measured temperature and the predetermined target temperature, The peritoneal dialysis device according to any one of Claims 1 to 3, in which the heating control unit controls the output of the heater at a ratio obtained by multiplying the output ratio by the first output adjustment unit and the output ratio by the second output adjustment unit.

5. When the temperature difference exceeds a predetermined value, the second output adjustment unit sets the output ratio of the heater to 1, and when the temperature difference is equal to or less than the predetermined value, the second output adjustment unit decreases the output ratio of the heater from 1 according to the decrease in the temperature difference. The peritoneal dialysis device according to Claim 4.

6. When the temperature difference exceeds a predetermined value, the first output adjustment unit sets the output ratio of the heater to 1 regardless of the liquid volume of the dialysis fluid in the heating unit. The peritoneal dialysis device according to Claim 5.

7. The liquid volume monitoring unit calculates the liquid volume of the dialysis fluid in the heating unit based on the liquid delivery volume of the liquid delivery unit. The peritoneal dialysis device according to any one of Claims 1 to 6.

8. The liquid delivery unit, A liquid delivery and drainage cassette comprising: a pump chamber having a diaphragm and formed with a liquid delivery opening through which liquid can enter and exit; and a tube having one end connected to the liquid delivery opening and the other end branched and connected to a liquid supply source and a liquid supply destination, respectively. Driving means for reciprocally driving the diaphragm with a constant stroke width. A flow path opening / closing mechanism for opening and closing the flow paths on the branched other end side of the tube, respectively. The peritoneal dialysis device according to claim 7, wherein the liquid delivery amount of the liquid delivery unit is calculated by multiplying the capacity of the pump chamber by the number of driving times of the driving means.

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