A two-way fluid management waste-free liquid bag type automatic peritoneal dialysis machine

Abstract

This invention provides a bidirectional fluid management-based waste-free automated peritoneal dialysis machine, relating to the field of dialysis equipment technology. The support frame is provided with a feed bag, a heating bag, and a waste bag arranged sequentially from top to bottom. The support frame also includes a control unit with a first and a second flow channel spaced apart from each other. When waste fluid from the patient's body is discharged along the first flow channel, dialysate in one of the feed bags flows along the second flow channel to the heating bag and is heated. Furthermore, the waste fluid in the first flow channel and the dialysate in the second flow channel can exchange heat, utilizing the residual heat of the waste fluid to preheat the dialysate that has not yet entered the heating bag. This reduces the required heating temperature of the heating bag, preventing localized overheating and ensuring the stability of the drug components in the dialysate.

Description

Technical Field

[0001] This invention relates to the field of dialysis equipment technology, and in particular to a waste-free bag-type automated peritoneal dialysis machine with bidirectional fluid management. Background Technology

[0002] With the increasing prevalence of chronic kidney disease, dialysis has become one of the key means for patients with end-stage renal disease to maintain their lives. Dialysis is mainly divided into two types: hemodialysis and peritoneal dialysis. Among them, peritoneal dialysis is gradually becoming more popular due to its relatively simple operation and suitability for home use. As the core equipment for this treatment, the peritoneal dialysis machine in current technology typically consists of a basic structure including a fluid storage device, a heating device, a power transmission device, and a control unit. Its shape is mostly designed as an upright frame, with a bag-type container on top for storing dialysate, a pump and tubing system integrated in the middle, and wheels at the bottom to improve portability. The heating device first heats the dialysate to near body temperature, and then injects it into the patient's peritoneal cavity through the power system. The peritoneum acts as a biological semipermeable membrane for solute and water exchange. Subsequently, metabolic waste and excess fluid are drawn out of the body as waste fluid, completing the purification of body fluids through circulation.

[0003] In existing technologies, automated peritoneal dialysis machines typically heat the dialysate bag by directly contacting the outer surface with a heating device. To achieve a dialysate temperature close to body temperature, a relatively high heating temperature needs to be set, which can easily lead to localized overheating of the bag and potentially affect the stability of the drug components in the dialysate.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a waste-free automated peritoneal dialysis machine with bidirectional fluid management to address the problems existing in current peritoneal dialysis machines.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A bidirectional fluid management, waste-free automated peritoneal dialysis machine includes a support frame. From top to bottom, the support frame is equipped with multiple feed bags, heating bags, and waste bags. Multiple feed bags are provided, each used to hold dialysate. The heating bags hold dialysate and can heat it to body temperature before injecting it into the patient. The waste bags hold waste fluid expelled from the patient. The support frame also includes a control unit with a first and a second flow channel spaced apart from each other. When waste fluid from the patient is discharged along the first flow channel, dialysate in one of the feed bags flows along the second flow channel to the heating bag and is heated. Furthermore, the waste fluid in the first flow channel and the dialysate in the second flow channel can exchange heat.

[0008] Furthermore, the control unit has a preset program, which includes the discharge of waste fluid from the patient's body along a first flow channel and the discharge of dialysate from one of the original fluid bags along a second flow channel to a heating bag; the waste fluid in the first flow channel has a first velocity value, and the dialysate in the second flow channel has a second velocity value. The control unit also includes a first adjustment component, which is used to reduce the second velocity value in the two preset programs to prolong the time for heat exchange between the waste fluid in the first flow channel and the dialysate in the second flow channel.

[0009] Furthermore, in the previous preset procedure, the dialysate in one of the original fluid bags is discharged into the heating bag; in the subsequent preset procedure, the waste fluid in the patient's body is discharged along the first flow channel into the waste fluid bag or into the original fluid bag that has been emptied in the previous preset procedure.

[0010] Furthermore, the control unit also includes a second adjustment component, which reduces the flow rate of waste fluid discharged from the patient's body in two preset programs to reduce the first speed value.

[0011] Furthermore, the control unit includes a pump body and nested outer and inner tubes. Both the outer and inner tubes have a first end and a second end. Multiple conduits communicating with the interior of the outer tube are evenly distributed from the first end to the second end. These conduits are respectively connected to a waste liquid bag, a stock solution bag, and a heating bag, and valves are provided on the conduits. The second end of the outer tube is connected to one end of the pump body, and the other end of the pump body extends into the patient's body, enabling bidirectional delivery. The first end of the inner tube has a first side hole, allowing communication between the interior of the inner tube and the interior of the outer tube. The second end of the inner tube is connected to one end of the pump body.

[0012] Furthermore, the second end of the outer tube is provided with an end cap, and the second end of the inner tube extends out of the end cap and is connected to one end of the pump body; the end cap has a first chamber and a second chamber spaced apart from each other, the first chamber is connected to the inside of the outer tube, the inner tube is provided with a second side hole, the second chamber is connected to the inside of the inner tube through the second side hole, and a connecting pipe is provided between the first chamber and the second chamber, and a one-way valve is provided in the connecting pipe. The one-way valve allows the liquid in the first chamber to flow into the second chamber, while preventing the liquid in the second chamber from flowing into the first chamber.

[0013] Furthermore, the support is equipped with a first detection element. When the pump body discharges waste fluid from the patient's body, the first detection element is used to detect the weight value of the discharged waste fluid. When the weight value is greater than a first preset value, the pump body is turned off.

[0014] Furthermore, a second detection element is provided at the other end of the pump body. When the pump body discharges waste fluid from the patient's body, the second detection element is used to detect the pressure value inside the other end of the pump body. When the pressure value is less than a second preset value, the pump body is turned off.

[0015] Furthermore, a third detection element is provided at the other end of the pump body. When the pump body discharges waste fluid from the patient's body, the third detection element is used to detect the content of the first gas inside the other end of the pump body. When the content of the first gas is greater than the third preset value, the pump body is turned off.

[0016] Furthermore, a fourth detection element is provided on the connecting tube. When the pump injects the dialysis fluid from the heating bag into the patient's body, the fourth detection element is used to detect the content of the second gas inside the connecting tube. When the content of the second gas is greater than the fourth preset value, the pump is turned off and the valve corresponding to the waste bag is opened.

[0017] The present invention has at least the following beneficial effects:

[0018] (1) When the waste fluid in the patient’s body is discharged along the first flow channel, the dialysate in one of the original fluid bags is discharged along the second flow channel to the heating bag and is heated. The waste fluid in the first flow channel and the dialysate in the second flow channel can exchange heat to use the residual heat of the waste fluid to preheat the dialysate that has not entered the heating bag, thereby reducing the heating temperature that the heating bag needs to be set, avoiding local overheating of the heating bag to a certain extent, and ensuring the stability of the drug components in the dialysate.

[0019] (2) The first flow channel and the second flow channel are separated from each other to avoid the waste liquid and dialysate coming into contact with each other and affecting the cleanliness of the dialysate. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the bidirectional fluid management waste-free bag-type automated peritoneal dialysis machine provided in Embodiment 1 of the present invention;

[0021] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 for Figure 1 The front view;

[0023] Figure 4 for Figure 1 Side view;

[0024] Figure 5 for Figure 4 BB-direction sectional view;

[0025] Figure 6 for Figure 5 A magnified view of a section at point C;

[0026] Figure 7 for Figure 5 A magnified view of a section at point D;

[0027] Figure 8 for Figure 5A magnified view of a section at point E in the middle;

[0028] Figure 9 This is a schematic diagram of the structure of the bidirectional fluid management waste-free bag-type automated peritoneal dialysis machine provided in Embodiment 2 of the present invention;

[0029] Figure 10 for Figure 9 A magnified view of a section at point F.

[0030] in:

[0031] 100. Support; 101. Raw material bag; 102. Heating bag; 103. Waste liquid bag; 104. Waste liquid box; 105. Heating box; 106. Pump body; 107. Outer pipe; 108. Inner pipe; 109. Conduit; 110. Valve; 111. First side hole; 112. Support plate; 113. Preheating component; 114. Separator; 115. Motor; 116. Second side hole; 117. End cap; 118. First chamber; 119. Second chamber; 120. Connecting pipe; 121. One-way valve; 122. First detection component; 123. Fourth detection component. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] Example 1

[0036] like Figures 1 to 8 As shown, Embodiment 1 of the present invention provides a bidirectional fluid management type 103 automatic peritoneal dialysis machine (hereinafter referred to as automatic peritoneal dialysis machine), including a support 100. The support 100 is provided with a raw fluid bag 101, a heating bag 102 and a waste fluid bag 103 from top to bottom. Multiple raw fluid bags 101 are provided and are used to hold dialysate. The heating bag 102 is used to hold dialysate and can heat the dialysate to body temperature and inject it into the patient's body. The waste fluid bag 103 is used to hold the waste fluid discharged from the patient's body. The support 100 is also provided with a control unit. The control unit has a first flow channel and a second flow channel that are spaced apart from each other. When the waste fluid in the patient's body is discharged along the first flow channel, the dialysate in one of the raw fluid bags 101 is discharged along the second flow channel to the heating bag 102 and is heated. The waste fluid in the first flow channel and the dialysate in the second flow channel can exchange heat.

[0037] When the waste fluid in the patient's body is discharged along the first flow channel, the dialysate in one of the original fluid bags 101 is discharged along the second flow channel to the heating bag 102 and is heated. The waste fluid in the first flow channel and the dialysate in the second flow channel can exchange heat to use the residual heat of the waste fluid to preheat the dialysate that has not entered the heating bag 102, thereby reducing the heating temperature that the heating bag 102 needs to be set. This helps to avoid local overheating of the heating bag 102 to a certain extent and ensures the stability of the drug components in the dialysate.

[0038] In addition, the first and second flow channels are separated from each other to prevent waste liquid and dialysate from coming into contact with each other and affecting the cleanliness of the dialysate.

[0039] The support frame 100 has a height-adjustable structure and casters at the bottom for easy operation and movement. A control panel is installed on the support frame 100 to display the dialysis status and adjust parameters. Multiple hooks are located at the top of the support frame 100 to secure the raw solution bag 101 to the top. A waste liquid container 104 is located at the bottom of the support frame 100 to hold the waste solution bag 103. A heating box 105 is located in the middle of the support frame 100 to hold the heating bag 102 and heat the dialysis fluid inside the heating bag 102. The specific structure and working principle of the heating box 105 are existing technologies and will not be described in detail here. Because the raw solution bag 101 is higher than the heating bag 102, the dialysis fluid in the raw solution bag 101 can be discharged to the heating bag 102 along the second flow channel under gravity. The control unit is connected to the raw solution bag 101, the heating bag 102, and the waste solution bag 103 via flexible hoses; the specific connection methods are described below.

[0040] Furthermore, the control unit has a preset program, which includes the discharge of waste fluid from the patient's body along the first flow channel and the discharge of dialysate in one of the original fluid bags 101 along the second flow channel to the heating bag 102; the waste fluid in the first flow channel has a first velocity value, and the dialysate in the second flow channel has a second velocity value. The control unit also includes a first adjustment component, which is used to reduce the second velocity value in the two preset programs to prolong the time for heat exchange between the waste fluid in the first flow channel and the dialysate in the second flow channel.

[0041] The waste liquid in the first flow channel flows in the opposite direction to the dialysate in the second flow channel. In two consecutive preset programs, the flow path of the dialysate in the second flow channel is reduced, shortening the path for heat exchange between the waste liquid in the first flow channel and the dialysate in the second flow channel, thus reducing heat exchange efficiency. In this invention, in both preset programs, the first regulating component reduces the second velocity value of the dialysate in the second flow channel to prolong the time for heat exchange between the waste liquid in the first flow channel and the dialysate in the second flow channel, thereby ensuring heat exchange efficiency.

[0042] The preset procedure includes: the dialysate heated to body temperature in the heating bag 102 is injected into the patient's body; the waste fluid in the patient's body is discharged along the first flow channel; and the dialysate in one of the original fluid bags 101 is discharged to the heating bag 102 along the second flow channel.

[0043] Optionally, the first regulating component can reduce the second velocity value by decreasing the cross-sectional area of ​​the second flow channel. The first regulating component can be a control valve; by controlling the opening degree of the corresponding control valve, the cross-sectional area of ​​the second flow channel can be controlled accordingly, thereby reducing the second velocity value. Of course, other structures of the first regulating component can also be used, and there is no limitation here.

[0044] Furthermore, in the previous preset procedure, the dialysate in one of the original fluid bags 101 is discharged into the heating bag 102; in the subsequent preset procedure, the waste fluid in the patient's body is discharged along the first flow channel to the waste fluid bag 103 or to the original fluid bag 101 that has been emptied in the previous preset procedure.

[0045] The original fluid bag 101 can hold dialysis fluid, or it can replace the waste fluid bag 103 after being emptied to hold the waste fluid excreted by the patient, achieving two uses in one bag. At the same time, it reduces the use of waste fluid bag 103, reduces the economic burden and material management complexity of long-term treatment for patients, reduces the health risks and operation time caused by disassembling and assembling waste fluid bag 103, reduces the generation of medical plastic waste, and is more environmentally friendly.

[0046] Furthermore, the control unit also includes a second adjustment component, which reduces the flow rate of waste fluid discharged from the patient's body in two preset programs to reduce the first speed value.

[0047] By reducing the flow rate of waste fluid discharged from the patient's body, the initial velocity value of the waste fluid in the first flow channel can be reduced, thereby further extending the time for heat exchange between the waste fluid in the first flow channel and the dialysate in the second flow channel, ensuring heat exchange efficiency.

[0048] Furthermore, the control unit includes a pump body 106 and an outer tube 107 and an inner tube 108 nested together. Both the outer tube 107 and the inner tube 108 have a first end and a second end. Multiple conduits 109 communicating with the interior of the outer tube 107 are evenly distributed from the first end to the second end. The multiple conduits 109 are respectively connected to the waste liquid bag 103, the original liquid bag 101, and the heating bag 102. Valves 110 are provided on the conduits 109. The second end of the outer tube 107 is connected to one end of the pump body 106, and the other end of the pump body 106 extends into the patient's body. The pump body 106 can deliver in both directions. The first end of the inner tube 108 has a first side hole 111, so that the interior of the inner tube 108 communicates with the interior of the outer tube 107. The second end of the inner tube 108 is connected to one end of the pump body 106.

[0049] When injecting dialysis fluid, the valve 110 corresponding to the heating bag 102 is opened, the pump 106 is activated, the dialysis fluid in the heating bag 102 enters its catheter 109 and outer tube 107, and is injected into the patient's body by the pump 106. When draining waste fluid, open valve 110 corresponding to waste fluid bag 103 or valve 110 corresponding to the emptied original fluid bag 101. Pump body 106 reverses direction, and waste fluid in the patient's body is drained into waste fluid bag 103 via pump body 106, inner tube 108, first side hole 111, and conduit 109 corresponding to waste fluid bag 103, or via inner tube 108, first side hole 111, outer tube 107, and conduit 109 corresponding to emptied original fluid bag 101. Simultaneously, open valve 110 corresponding to one of the original fluid bags 101 and heating bag 102. Dialysis fluid in the original fluid bag 101 sequentially enters its conduit 109, outer tube 107, and conduit 109 corresponding to heating bag 102, and is finally drained into heating bag 102 for heating. Heat exchange occurs during the flow of waste fluid and dialysis fluid.

[0050] It is understood that the inner tube 108, the first side hole 111, and the corresponding conduit 109 together form the first flow channel, but the heat exchange portion of the first flow channel is located inside the inner tube 108. The conduit 109 corresponding to the raw liquid bag 101, the outer tube 107, and the conduit 109 corresponding to the heating bag 102 together form the second flow channel, but the heat exchange portion of the second flow channel is located inside the outer tube 107. In other words, heat exchange can only occur when the waste liquid flows along the inner tube 108 and the dialysate flows along the outer tube 107. In addition, the pump body 106 and valve 110 must be closed promptly after each opening and corresponding liquid delivery. Unless explicitly mentioned as being opened, the pump body 106 and valve 110 are in the closed state in the following text. The second regulating component is used to regulate the flow rate of the pump body 106.

[0051] The pump body 106 is a peristaltic pump, equipped with a corresponding power source and control module, enabling it to deliver liquid bidirectionally. Its structure and working principle are existing technologies and will not be elaborated here. Furthermore, the automatic peritoneal dialysis machine of this invention eliminates the need for a drainage bucket, simplifying operation and reducing operating costs.

[0052] See also Figure 2The support plate 112 is provided on the support 100. The outer tube 107 and the conduit 109 are perpendicular to each other and fixed on the support plate 112. The number of conduits 109 is greater than 3, preferably 6. Each conduit 109 corresponds to a valve 110, which is set on the support plate 112. The first end is the left end, the second end is the right end, the leftmost end is the starting end, and the rightmost end is the ending end. The first to sixth conduits 109 are respectively provided. The first conduit 109 is connected to the waste liquid bag 103. The four middle conduits 109 are connected to the four upper raw liquid bags 101 in sequence. The sixth conduit 109 is connected to the heating bag 102. The rightmost conduit 109 is provided with a preheating element 113 on its outer side, which can also preheat the dialysate entering the heating bag 102, further reducing the heating temperature that the heating bag 102 needs to be set, avoiding local overheating of the heating bag 102, and ensuring the stability of the drug components in the dialysate.

[0053] Since each original fluid bag 101 (including the heating bag 102) is independent, the corresponding sequence of dialysis fluid (medications) can be placed in the corresponding positions in advance, allowing the use of different dialysis fluids (medications) according to medical orders, thus improving operational flexibility. Furthermore, the automated peritoneal dialysis machine of this invention has a high degree of integration, optimizing the internal pipeline layout and the system composed of the pump body 106 and valves 110, reducing the size and weight of the automated peritoneal dialysis machine, facilitating storage and movement, and improving operational flexibility. Secondly, the control panel on the support 100 enables doctors to remotely issue prescriptions. Specifically, after remotely viewing patient data on the platform, doctors can issue new electronic prescriptions online. The design verifies that the prescription is securely encrypted before being sent to the patient's device control panel, which automatically receives the electronic prescription and updates treatment parameters, ensuring the legality and security of prescription modifications. Thirdly, it achieves efficient and personalized diagnosis and treatment. Doctors can remotely, accurately, and promptly adjust prescriptions, improving treatment efficiency and enabling individualized dynamic treatment. Patients can avoid frequent hospital visits and receive real-time treatment plans more tailored to their individual conditions.

[0054] It is worth noting that, based on the design principle, the heating bag 102 can be empty initially. During use, valves 110 of the second and sixth catheters 109 are opened, allowing the dialysate in the first stock solution bag 101 to sequentially enter the second catheter 109, the outer tube 107, and the sixth catheter 109, ultimately draining into the heating bag 102. The flow path of the dialysate at this point is the second flow channel. Simultaneously, the patient's waste fluid flows along the pump body 106, the inner tube 108, the first side hole 111, and the first catheter 109 into the waste fluid bag 103. The flow path of the waste fluid at this point is the first flow channel. Alternatively, in actual use, a stock solution bag 101 containing dialysate can be directly placed in the heating box 105 for heating. During use, the patient's waste fluid is drained directly into the waste fluid bag 103 initially, and the residual heat of this waste fluid is not utilized. Therefore, the preheating element 113 and the heating box 105 need to be set to a higher temperature. Thus, the above two specific operating procedures can be selected according to actual needs.

[0055] Preferably, a raw material bag 101 containing dialysate is directly placed in a heating box 105 for heating. In the first preset program, valve 110 of the sixth catheter 109 is opened, pump 106 is activated, and dialysate in the heating bag 102 is injected into the patient along the sixth catheter 109, outer tube 107, and pump 106. Then, valve 110 of the first catheter 109 is opened, pump 106 reverses direction, and waste fluid in the patient is discharged along pump 106, inner tube 108, first side hole 111, and first catheter 109 into waste fluid bag 103. After discharge, pump 106 is turned off.

[0056] In the second preset procedure, valve 110 of the sixth catheter 109 is opened, and pump 106 is activated. Dialysis fluid in heating bag 102 is injected into the patient's body along the sixth catheter 109, outer tube 107, and pump 106. Then, valve 110 of the first catheter 109 is opened, and pump 106 reverses direction. Waste fluid in the patient's body is discharged along pump 106, inner tube 108, first side hole 111, outer tube 107, and the first catheter 109 to waste fluid bag 103. After discharge, pump 106 is closed. Simultaneously, valves 110 of the second and sixth catheters 109 are opened. Under gravity, dialysis fluid in the first original fluid bag 101 sequentially enters the second catheter 109, outer tube 107, and sixth catheter 109, and finally discharges to heating bag 102. The dialysis fluid is heated to body temperature by preheating element 113 and heating bag 102. During this process, waste fluid and dialysis fluid exchange heat to preheat the dialysis fluid.

[0057] In the third preset procedure, valve 110 of the sixth catheter 109 is opened, pump 106 is activated, and dialysis fluid in heating bag 102 is injected into the patient's body along the sixth catheter 109, outer tube 107 and pump 106. Then, valve 110 of the second catheter 109 is opened, and pump 106 runs in reverse. The first raw fluid bag 101 has been emptied. The waste fluid in the patient's body is discharged along pump 106, inner tube 108, first side hole 111, outer tube 107 and second catheter 109 to the first raw fluid bag 101. After the discharge is complete, pump 106 is closed. At the same time, valves 110 of the third and sixth catheters 109 are opened. Under the action of gravity, the dialysate in the second raw fluid bag 101 enters the third catheter 109, outer tube 107 and sixth catheter 109 in sequence, and is finally discharged to heating bag 102. The dialysate is heated to body temperature by preheating element 113 and heating bag 102. During this period, waste fluid and dialysate exchange heat to preheat the dialysate.

[0058] The process is repeated in the above manner until the fifth preset procedure, at which point the valve 110 of the sixth catheter 109 is opened, the pump 106 is activated, and the dialysis fluid in the heating bag 102 is injected into the patient's body along the sixth catheter 109, the outer tube 107, and the pump 106. Then, the valve 110 of the fourth catheter 109 is opened, the pump body 106 is running, the third raw fluid bag 101 has been emptied, and the waste fluid in the patient's body is discharged along the pump body 106, inner tube 108, first side hole 111, outer tube 107 and the fourth catheter 109 to the third raw fluid bag 101. After the discharge is complete, the pump body 106 is closed. At the same time, the valves 110 of the fifth and sixth catheters 109 are opened. Under the action of gravity, the dialysate in the fourth raw fluid bag 101 enters the fifth catheter 109, outer tube 107 and the sixth catheter 109 in sequence, and is finally discharged to the heating bag 102. The dialysate is heated to body temperature by the preheating element 113 and the heating bag 102. During this period, the waste fluid and the dialysate exchange heat to preheat the dialysate. Ultimately, waste liquid bag 103 was filled with waste liquid twice, and the first, second and third original liquid bags 101 were used to fill with waste liquid once each, replacing waste liquid bag 103. The fourth original liquid bag 101 and heating bag 102 were emptied.

[0059] Further, see Figure 7The first adjustment component is described below: the inner tube 108 and the outer tube 107 are coaxial and the inner tube 108 can rotate around its axis. A separator 114 is slidably provided between the inner tube 108 and the outer tube 107 along their length direction. The separator 114 can separate the space between the inner tube 108 and the outer tube 107. A motor 115 is provided on the support plate 112. The output end of the motor 115 is connected to the first end of the inner tube 108. The outer wall of the inner tube 108 is provided with an external thread. The separator 114 is provided with a threaded hole that mates with the external thread. The output end of the motor 115 drives the inner tube 108 to rotate, which drives the separator 114 to move between the inner tube 108 and the outer tube 107. When the separator 114 is located at the connection between the conduit 109 and the outer tube 107, it can block the conduit 109, and the blocking area can be changed according to the specific position of the separator 114.

[0060] In the first preset procedure described above, the waste fluid in the patient's body is discharged into the waste fluid bag 103 via the pump body 106, inner tube 108, first side hole 111, outer tube 107, and first catheter 109. Simultaneously, the dialysate in the first original fluid bag 101 sequentially enters the second catheter 109, outer tube 107, and sixth catheter 109, and is finally discharged into the heating bag 102. During this process, the heat exchange path between the waste fluid and the dialysate is from the second catheter 109 to the sixth catheter 109. The separator 114 is located at the connection between the second catheter 109 and the outer tube 107, and has the smallest sealing area for the catheter 109.

[0061] In the second preset procedure described above, the waste fluid in the patient's body is discharged along the pump body 106, inner tube 108, first side hole 111, outer tube 107, and second catheter 109 to the first raw fluid bag 101. Simultaneously, the dialysate in the second raw fluid bag 101 sequentially enters the third catheter 109, outer tube 107, and sixth catheter 109, and is finally discharged to the heating bag 102. During this process, the heat exchange path between the waste fluid and dialysate is from the third catheter 109 to the sixth catheter 109, shortening the heat exchange path and reducing heat exchange efficiency. During this process, the separator 114 is located at the connection between the third catheter 109 and the outer tube 107, and the sealing area of ​​the catheter 109 is increased, reducing the first velocity value of the waste fluid flowing in the first flow channel. This prolongs the time for heat exchange between the waste fluid in the first flow channel and the dialysate in the second flow channel, ensuring heat exchange efficiency.

[0062] The process is repeated in the above manner. In the fourth preset procedure, the separator 114 is located at the connection between the fifth conduit 109 and the outer tube 107, and the sealing area of ​​the conduit 109 continues to increase. As the preset procedure proceeds, the first velocity value of the waste liquid flowing in the first flow channel is gradually reduced, which can prolong the time for heat exchange between the waste liquid in the first flow channel and the dialysate in the second flow channel, thus ensuring heat exchange efficiency.

[0063] In this embodiment, for a raw fluid bag 101, the raw fluid bag 101 has a cavity inside, which can be used to hold dialysate. After the dialysate is drained, the cavity can also replace the waste fluid bag 103 to hold the waste fluid discharged from the patient's body.

[0064] Further, see Figure 6 The second end of the outer tube 107 is provided with an end cap 117, and the second end of the inner tube 108 extends out of the end cap 117 and is connected to one end of the pump body 106. The end cap 117 has a first chamber 118 and a second chamber 119 spaced apart from each other. The first chamber 118 is in communication with the interior of the outer tube 107. The inner tube 108 is provided with a second side hole 116. The second chamber 119 is in communication with the interior of the inner tube 108 through the second side hole 116. A connecting pipe 120 is provided between the first chamber 118 and the second chamber 119. A one-way valve 121 is provided in the connecting pipe 120. The one-way valve 121 allows the liquid in the first chamber 118 to flow into the second chamber 119, while preventing the liquid in the second chamber 119 from flowing into the first chamber 118.

[0065] When dialysis fluid is injected, the dialysis fluid in the heating bag 102 enters its catheter 109 and outer tube 107, and then enters the pump body 106 through the first chamber 118, connecting tube 120, second chamber 119, second side hole 116 and inner tube 108. The pump body 106 then injects the dialysis fluid into the patient's body. Under the action of the one-way valve 121, the dialysis fluid in the outer tube 107 and the first chamber 118 can enter the second chamber 119 and the inner tube 108 through the connecting tube 120, ensuring the smooth injection of dialysis fluid. When draining waste fluid, the waste fluid in the patient's body enters the inner tube 108 along the pump body 106, and is drained to the waste fluid bag 103 through the first side hole 111 and the conduit 109 corresponding to the waste fluid bag 103, or through the first side hole 111, the outer tube 107 and the conduit 109 corresponding to the emptied original fluid bag 101, and is drained to the emptied original fluid bag 101. Under the action of the one-way valve 121, the waste fluid output from the pump body 106 cannot enter the first chamber 118 along the inner tube 108, the second side hole 116, the connecting tube 120, and ensure that the waste fluid can only enter the inner tube 108. At the same time, the dialysate in one of the original fluid bags 101 enters its conduit 109, the outer tube 107 and the conduit 109 corresponding to the heating bag 102 in sequence, and is finally drained to the heating bag 102 to be heated. Heat exchange can occur when the waste fluid and dialysate flow.

[0066] Furthermore, the stent 100 is provided with a first detection element 122. When the pump body 106 discharges waste fluid from the patient's body, the first detection element 122 is used to detect the weight value of the discharged waste fluid. When the weight value is greater than a first preset value, the pump body 106 is turned off.

[0067] Under the suction action of the pump body 106, the waste fluid in the patient's body is gradually discharged, and the weight of the discharged waste fluid gradually increases. When the weight value is greater than the first preset value, it indicates that the waste fluid has been completely discharged. The pump body 106 is then turned off to complete the waste fluid discharge process, which makes it easier to judge whether the waste fluid has been completely discharged and improves the convenience of operation.

[0068] The first detection element 122 is a weighing sensor, the structure and working principle of which are existing technologies and will not be described in detail here. Multiple first detection elements 122 are provided. A first detection element 122 is provided between the support 100 and the waste fluid bag 103 to detect the weight of the waste fluid bag 103 and the waste fluid contained therein. A first detection element 122 is provided between the support 100 and the hook to detect the weight of the original fluid bag 101 and the dialysate contained therein. When the dialysate in the original fluid bag 101 has been drained and the patient's waste fluid has been collected, the first detection element 122 can also be used to detect the weight of the original fluid bag 101 and the waste fluid inside. A first detection element 122 is also provided between the support 100 and the heating bag 102 to detect the weight of the heating bag 102 and the dialysate inside it.

[0069] Furthermore, a second detection element is provided at the other end of the pump body 106. When the pump body 106 discharges waste fluid from the patient's body, the second detection element is used to detect the pressure value inside the other end of the pump body 106. When the pressure value is less than a second preset value, the pump body 106 is turned off.

[0070] Under the suction action of the pump body 106, the waste fluid in the patient's body is gradually discharged, and the pressure value in the patient's body gradually decreases. When the pressure value is less than the second preset value, it indicates that the waste fluid has been completely discharged. The pump body 106 is then turned off to complete the waste fluid discharge process, which makes it easier to judge whether the waste fluid has been completely discharged and further improves the convenience of operation.

[0071] The second detection element is a pressure sensor, which can detect the pressure value inside the other end of the pump body 106. Specifically, it can be a piezoresistive or capacitive pressure sensor, and the specific selection is not limited here. The structure and working principle of the aforementioned pressure sensor are existing technologies and will not be elaborated further.

[0072] Furthermore, a third detection element is provided at the other end of the pump body 106. When the pump body 106 discharges waste fluid from the patient's body, the third detection element is used to detect the content of a first gas inside the other end of the pump body 106. When the content of the first gas is greater than a third preset value, the pump body 106 is turned off.

[0073] Under the suction action of the pump body 106, the waste fluid in the patient's body is gradually discharged, and the gas in the patient's body is gradually extracted. When the first gas content is greater than the third preset value, it indicates that the waste fluid has been completely discharged. The pump body 106 is then turned off to complete the waste fluid discharge process, which makes it easier to judge whether the waste fluid has been completely discharged and further improves the convenience of operation.

[0074] The third detection element is a bubble sensor, which can detect the content of the first gas inside the other end of the pump body 106. Specifically, it can be an ultrasonic, capacitive, or optical sensor. When an optical sensor is used as the third detection element, the tubing at the other end of the pump body 106 must be made of a transparent material. The structure and working principle of the bubble sensor described above are existing technologies and will not be elaborated further.

[0075] Furthermore, a fourth detection element 123 is provided on the connecting tube 120. When the pump body 106 injects the dialysis fluid in the heating bag 102 into the patient's body, the fourth detection element 123 is used to detect the content of the second gas inside the connecting tube 120. When the content of the second gas is greater than the fourth preset value, the pump body 106 is turned off and the valve 110 corresponding to the waste liquid bag 103 is opened.

[0076] Under the pump's blowing action, the dialysate in the heating bag 102 is gradually injected into the patient's body. Before injection, the content of the second gas in the dialysate is detected. When the content of the second gas is greater than the fourth preset value, the dialysate needs to be degassed. The pump body 106 is turned off, and the valve 110 corresponding to the waste bag 103 is opened. The gas in the dialysate enters the connecting tube 120, the second side hole 116, the inner tube 108, the first side hole 111, and the conduit 109 corresponding to the waste bag 103 in sequence, and is discharged into the waste bag 103 until the content of the second gas is less than or equal to the fourth preset value. Then the pump body 106 is restarted to continue the injection.

[0077] The fourth detection element 123 is also a bubble sensor, capable of detecting the content of the second gas inside the connecting tube 120. Specifically, it can employ ultrasonic, capacitive, or optical sensors. When the fourth detection element 123 uses an optical sensor, the connecting tube 120 must be made of a transparent material. The structure and working principle of the bubble sensor described above are existing technologies and will not be elaborated further.

[0078] The working principle of Embodiment 1 of the present invention is as follows:

[0079] On the support plate 112, the leftmost end is the starting end, and the rightmost end is the ending end. The first catheter 109 is connected to the waste fluid bag 103, the four middle catheters 109 are connected to the four upper raw fluid bags 101 in sequence, and the sixth catheter 109 is connected to the heating bag 102. A raw fluid bag 101 containing dialysis fluid is directly placed in the heating box 105 for heating. When the patient starts dialysis treatment, the first to fifth preset procedures are performed sequentially.

[0080] In the first preset procedure, valve 110 of the sixth catheter 109 is opened, and pump 106 operates. Dialysis fluid in heating bag 102 enters outer tube 107 through the sixth catheter 109, and then enters pump 106 through first chamber 118, connecting tube 120, second chamber 119, second side hole 116, and inner tube 108, before being injected into patient's body. Afterward, valve 110 of the first catheter 109 is opened, and pump 106 operates in reverse. Waste fluid from patient's body is discharged into waste bag 103 through pump 106, inner tube 108, first side hole 111, and first catheter 109. After discharge, pump 106 is turned off.

[0081] In the second preset procedure, the valve 110 of the sixth catheter 109 is opened, the pump body 106 is activated, and the dialysate in the heating bag 102 enters the outer tube 107 along the sixth catheter 109, and then enters the pump body 106 after passing through the first chamber 118, the connecting tube 120, the second chamber 119, the second side hole 116 and the inner tube 108, and is then injected into the patient's body through the pump body 106. Then, valve 110 of the first catheter 109 is opened, and pump 106 runs in reverse. Waste fluid from the patient's body is discharged along pump 106, inner tube 108, first side hole 111, outer tube 107, and the first catheter 109 to waste fluid bag 103. After discharge, pump 106 is closed. At the same time, valves 110 of the second and sixth catheters 109 are opened. Under the action of gravity, dialysate in the first original fluid bag 101 enters the second catheter 109, outer tube 107, and sixth catheter 109 in sequence, and is finally discharged to heating bag 102. The dialysate is heated to body temperature by preheating element 113 and heating bag 102. During this period, waste fluid and dialysate exchange heat to use the residual heat of waste fluid to preheat dialysate that has not entered heating bag 102, thereby reducing the heating temperature that heating bag 102 needs to be set, and to a certain extent avoiding local overheating of heating bag 102, and ensuring the stability of drug components in dialysate.

[0082] In the third preset procedure, the valve 110 of the sixth catheter 109 is opened, the pump body 106 is activated, and the dialysate in the heating bag 102 enters the outer tube 107 along the sixth catheter 109, and then enters the pump body 106 after passing through the first chamber 118, the connecting tube 120, the second chamber 119, the second side hole 116 and the inner tube 108, and is then injected into the patient's body through the pump body 106. Then, valve 110 of the second catheter 109 is opened, and pump 106 runs in reverse. The first raw fluid bag 101 has been emptied. The waste fluid in the patient's body is discharged along pump 106, inner tube 108, first side hole 111, outer tube 107 and second catheter 109 to the first raw fluid bag 101. After the discharge is complete, pump 106 is closed. At the same time, valves 110 of the third and sixth catheters 109 are opened. Under the action of gravity, the dialysate in the second raw fluid bag 101 enters the third catheter 109, outer tube 107 and sixth catheter 109 in sequence, and is finally discharged to heating bag 102. The dialysate is heated to body temperature by preheating element 113 and heating bag 102. During this period, the waste fluid and dialysate exchange heat. The sealing area of ​​the separator 114 on the third catheter 109 is increased, which reduces the first velocity value of the waste fluid flow and prolongs the time for heat exchange between the waste fluid and dialysate, ensuring heat exchange efficiency.

[0083] The process is repeated in the above manner until the fifth preset procedure, at which point the valve 110 of the sixth catheter 109 is opened, the pump 106 is activated, and the dialysis fluid in the heating bag 102 is injected into the patient's body along the sixth catheter 109, the outer tube 107, and the pump 106. Then, the valve 110 of the fourth catheter 109 is opened, the pump body 106 is running, and the third raw fluid bag 101 has been emptied. The waste fluid in the patient's body is discharged along the pump body 106, inner tube 108, first side hole 111, outer tube 107 and the fourth catheter 109 to the third raw fluid bag 101. After the discharge is complete, the pump body 106 is closed. At the same time, the valves 110 of the fifth and sixth catheters 109 are opened. Under the action of gravity, the dialysate in the fourth raw fluid bag 101 enters the fifth catheter 109, outer tube 107 and the sixth catheter 109 in sequence, and is finally discharged to the heating bag 102. The dialysate is heated to body temperature by the preheating element 113 and the heating bag 102. During this period, the waste fluid and dialysate exchange heat. The sealing area of ​​the separator 114 on the fifth catheter 109 continues to increase, so that the first velocity value of the waste fluid flow continues to decrease, further prolonging the time for heat exchange between the waste fluid and dialysate, ensuring heat exchange efficiency.

[0084] Ultimately, the waste liquid bag 103 was used twice, and the first, second, and third original liquid bags 101 each replaced the waste liquid bag 103 and were used once. The fourth original liquid bag 101 and the heating bag 102 were emptied, thus achieving dual use of one bag. At the same time, the use of waste liquid bag 103 was reduced, which reduced the economic burden and material management complexity of long-term treatment for patients, reduced the health risks and operation time caused by disassembling and assembling waste liquid bag 103, reduced the generation of medical plastic waste, and was more environmentally friendly.

[0085] In existing technologies, automated peritoneal dialysis machines typically heat the dialysate bag by directly contacting the outer surface with a heating device. To achieve a dialysate temperature close to body temperature, a relatively high heating temperature needs to be set, which can easily lead to localized overheating of the bag and potentially affect the stability of the drug components in the dialysate.

[0086] The following is a comparative experiment on the effects of heating the dialysate through direct contact and preheating the dialysate with waste liquid in Example 1 of this invention on the drug components in the dialysate.

[0087] The basic information of the samples in the control group and the experimental group is shown in Table 1.

[0088] Table 1 Basic Information of the Sample

[0089]

[0090] Remark:

[0091] 1. All samples were from the same batch of dialysate and were stored in a sealed container away from light;

[0092] 2. All samples also contained 2 mmol / L of potassium ions, a core component of the dialysate;

[0093] 3. The control group used an existing peritoneal dialysis machine with a contact heating device; the experimental group used the product of Example 1, which uses waste liquid to preheat the sample and also has a contact heating device.

[0094] The parameters of the testing device used in the experiment are shown in Table 2.

[0095] Table 2 Parameters of the Detection Device

[0096]

[0097] The temperature detection data during the experiment are shown in Table 3.

[0098] Table 3 Temperature monitoring data

[0099]

[0100] Remark:

[0101] 1. The temperature of the test samples before entering the heating bag after being preheated by the residual heat of the waste liquid was 30.0±0.2℃;

[0102] 2. The total heating time for all samples was consistent, with a target outlet temperature of 37.0 ± 0.2℃.

[0103] The relative retention rates of drug components in the experiment are shown in Table 4.

[0104] Table 4. Relative retention rate data of drug components

[0105]

[0106] Remark:

[0107] 1. Relative retention rate = (content of components after heating / initial content before heating) × 100%;

[0108] 2. Each group of samples was tested in parallel three times, and the average value was taken.

[0109] The results of the temperature control effect assessment are shown in Table 5.

[0110] Table 5. Evaluation of Temperature Control Effectiveness

[0111]

[0112] Remark:

[0113] 1. Acceptance standard: The highest temperature in the heating zone should be ≤45℃ to avoid local overheating that could lead to drug degradation;

[0114] 2. The experimental group preheated with waste liquid, and the heating set temperature was 5℃ lower than that of the control group, which effectively controlled the peak temperature of the heating zone.

[0115] The results of the drug component stability determination are shown in Table 6.

[0116] Table 6. Stability determination of drug components

[0117]

[0118] Remark:

[0119] 1. The qualification standard is the industry-standard requirement for drug stability in peritoneal dialysis fluid: relative retention rate of heat-sensitive core components ≥ 98%;

[0120] 2. The data has been corrected for equipment system errors.

[0121] The test environment is shown in Table 7.

[0122] Table 7 Test Environment

[0123]

[0124] As shown in Tables 5 and 6, for the highest temperature in the heating zone, the relevant data for the control group (heating the dialysate through direct contact) are higher than those for the experimental group (preheating the dialysate with waste liquid in Embodiment 1 of this invention). Furthermore, the temperature control effect of the control group is unqualified, while the temperature control effect of the experimental group is qualified. Regarding the relative retention rates of glucose and sodium bicarbonate, the relevant data for the control group are lower than those for the experimental group. Moreover, the drug component stability of the control group is unqualified, while the drug component stability of the experimental group is qualified. Therefore, Embodiment 1 of this invention utilizes the residual heat of the waste liquid to preheat the dialysate that has not yet entered the heating bag 102, thereby reducing the required heating temperature of the heating bag 102 and, to a certain extent, preventing localized overheating of the heating bag 102, thus ensuring the stability of the drug components in the dialysate.

[0125] Example 2

[0126] like Figure 9 and Figure 10 As shown, Embodiment 2 of the present invention provides a bidirectional fluid management, waste-free bagless 103-type automatic peritoneal dialysis machine, which differs from Embodiment 1 in that:

[0127] Without the separator 114, the inner tube 108 and the outer tube 107 are directly connected through the first side hole 111.

[0128] For a raw material bag 101, it has two bags, referred to as the first bag and the second bag. The first bag is used to hold the dialysate, and after the dialysate is drained, the second bag can also hold the waste fluid discharged from the patient's body.

[0129] Five conduits 109 are provided, all with a Y-shaped structure, and each conduit 109 has two outlets. Six valves 110 are provided. For the first conduit 109 and the first raw material bag 101, one outlet connects to the first bag body, and the other outlet connects to the second bag body; both outlets are controlled by the first valve 110. Following this connection method, for the fourth conduit 109 and the fourth raw material bag 101, one outlet connects to the first bag body (controlled by the fourth valve 110), and the other outlet connects to the second bag body (controlled by the fifth valve 110). For the fifth conduit 109, one outlet connects to the waste liquid bag 103, and the other outlet connects to the heating bag 102 via the sixth valve 110.

[0130] In use, in the first preset program, the first valve 110 and the sixth valve 110 are opened. The dialysate in the first bag of the first raw solution bag 101 enters the first catheter 109, passes through the inner tube 108 and the outer tube 107, and then enters the fifth catheter 109, before entering the heating bag 102 for heating. Then, the sixth valve 110 is opened, and the pump 106 operates. The dialysate in the heating bag 102 passes through the fifth catheter 109, the inner tube 108, and the outer tube 107 and is injected into the patient. Afterward, the first valve 110 is opened, and the pump 106 reverses its operation. The waste fluid from the patient passes through the inner tube 108 and the outer tube 107, enters the first catheter 109, and then enters any bag of the first raw solution bag 101. During this process, the amount of waste fluid expelled from the patient is generally greater than the amount of dialysate injected; therefore, the raw solution bag 101 is equipped with two bags to accommodate excess waste fluid.

[0131] The process continues in the above manner until the fourth preset procedure, when the fourth valve 110 and the sixth valve 110 are opened. The dialysate in the first bag of the fourth raw material bag 101 enters the fourth catheter 109, then through the inner tube 108 and the outer tube 107, and finally into the fifth catheter 109, before entering the heating bag 102 for heating. Then, the sixth valve 110 is opened, and the pump 106 operates. The dialysate in the heating bag 102 flows through the fifth catheter 109, the inner tube 108, and the outer tube 107 and is injected into the patient. Afterward, the fifth valve 110 is opened, and the pump 106 reverses its operation. The waste fluid from the patient flows through the inner tube 108 and the outer tube 107 into the fourth catheter 109, then into the second bag of the fourth raw material bag 101, or through the fifth catheter 109 into the waste fluid bag 103. During this process, the amount of waste fluid expelled from the patient is generally greater than the amount of dialysate injected; therefore, the raw material bag 101 is equipped with two bags to accommodate excess waste fluid.

[0132] Additionally, for the fourth raw material bag 101, its first bag body is located at the top of the support 100, and its second bag body is placed inside the waste liquid box 104. When the dialysate in the heating bag 102 is injected into the patient's body, but air bubbles are present in the dialysate in the heating bag 102, the fifth valve 110 and the sixth valve 110 can be opened. The air bubbles in the dialysate will enter the fifth catheter 109, pass through the inner tube 108 and the outer tube 107, enter the fourth catheter 109, and be discharged into the second bag body of the fourth raw material bag 101. After that, the pump 106 can be activated to inject the dialysate in the heating bag 102 into the patient's body.

[0133] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0134] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A waste-free bag-type automated peritoneal dialysis machine with bidirectional fluid management, characterized in that, The device includes a stent, which, from top to bottom, comprises a raw fluid bag, a heating bag, and a waste fluid bag. Multiple raw fluid bags are provided, each used to hold dialysate. The heating bag holds the dialysate and heats it to body temperature before injecting it into the patient. The waste fluid bag holds the waste fluid expelled from the patient. The stent also includes a control unit with a first and a second flow channel spaced apart from each other. When the waste fluid from the patient is discharged along the first flow channel, the dialysate in one of the raw fluid bags flows along the second flow channel to the heating bag and is heated. Furthermore, the waste fluid in the first flow channel and the dialysate in the second flow channel can exchange heat. The control unit has preset programs, which include the discharge of waste fluid from the patient's body along a first flow channel and the discharge of dialysate from one of the original fluid bags along a second flow channel to a heating bag. The waste fluid in the first flow channel has a first velocity value, and the dialysate in the second flow channel has a second velocity value. The control unit also includes a first adjustment component, which is used to reduce the second velocity value in both preset programs to prolong the time for heat exchange between the waste fluid in the first flow channel and the dialysate in the second flow channel. In the first preset program, the dialysate from one of the original fluid bags is discharged into the heating bag. In the second preset program, the waste fluid from the patient's body is discharged along the first flow channel to the waste fluid bag or to the original fluid bag that was emptied in the first preset program. The control unit includes a pump body and nested outer and inner tubes. Both the outer and inner tubes have a first end and a second end. Multiple conduits communicating with the interior of the outer tube are evenly distributed from the first end to the second end. These conduits are respectively connected to a waste liquid bag, a stock solution bag, and a heating bag, and are equipped with valves. The second end of the outer tube is connected to one end of the pump body, and the other end of the pump body extends into the patient's body, enabling bidirectional delivery. The first end of the inner tube has a first side hole, allowing communication between the interior of the inner tube and the interior of the outer tube. The second end of the inner tube is connected to one end of the pump body. The outer tube has an end cap at its second end, and the inner tube extends out of the end cap and connects to one end of the pump body. The end cap has a first chamber and a second chamber spaced apart from each other. The first chamber is connected to the interior of the outer tube. The inner tube has a second side hole, and the second chamber is connected to the interior of the inner tube through the second side hole. A connecting pipe is provided between the first chamber and the second chamber, and a one-way valve is provided in the connecting pipe. The one-way valve allows liquid in the first chamber to flow into the second chamber, while preventing liquid in the second chamber from flowing into the first chamber. The inner tube and the outer tube are coaxial, and the inner tube can rotate around its axis. A separator is provided between the inner tube and the outer tube along their length, and the separator can separate the space between the inner tube and the outer tube.

2. The no-waste dialysate bag automated peritoneal dialysis machine of bidirectional fluid management of claim 1, wherein, The control unit also includes a second adjustment component, which reduces the flow rate of waste fluid discharged from the patient's body in two preset programs to reduce the first speed value.

3. The bidirectional fluid management waste-free bag-type automated peritoneal dialysis machine according to claim 1, characterized in that, The support is equipped with a first detection element. When the pump body discharges waste fluid from the patient's body, the first detection element is used to detect the weight value of the discharged waste fluid. When the weight value is greater than a first preset value, the pump body is turned off.

4. The waste-free bag-type automated peritoneal dialysis machine with bidirectional fluid management according to claim 1, characterized in that, The other end of the pump body is equipped with a second detection element. When the pump body discharges waste fluid from the patient's body, the second detection element is used to detect the pressure value inside the other end of the pump body. When the pressure value is less than the second preset value, the pump body is turned off.

5. The no-waste dialysate bag automated peritoneal dialysis machine of bidirectional fluid management of claim 1, wherein, The other end of the pump body is also equipped with a third detection device. When the pump body discharges waste fluid from the patient's body, the third detection device is used to detect the content of the first gas inside the other end of the pump body. When the content of the first gas is greater than the third preset value, the pump body is turned off.

6. The waste-free bag-type automated peritoneal dialysis machine with bidirectional fluid management according to claim 1, characterized in that, The connecting tube is equipped with a fourth detection device. When the pump injects the dialysis fluid from the heating bag into the patient's body, the fourth detection device is used to detect the content of the second gas inside the connecting tube. When the content of the second gas is greater than the fourth preset value, the pump is turned off and the valve corresponding to the waste bag is opened.

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