Fluid conveying control system, control method and peritoneal dialysis device

Abstract

The invention discloses a fluid conveying control system and method and a peritoneal dialysis device.The control system comprises a cam driving mechanism, and the cam driving mechanism comprises a driving wheel which can be rotationally arranged in an operable mode; one end of the sliding block is linked with the driving wheel, the other end of the sliding block is an acting end capable of being linked with a diaphragm of the pump cavity, and the driving wheel can drive the sliding block to do linear reciprocating motion when rotating, so that the sliding block is switched between a first posture and a second posture; in the first posture, the acting end limits the diaphragm at the first position so as to limit the minimum preset volume of the pump cavity, and in the second posture, the acting end limits the diaphragm at the second position so as to limit the maximum preset volume of the pump cavity. The cam driving mechanism of the fluid conveying control system drives the sliding block to do linear reciprocating motion through rotation of the driving wheel, the position of the diaphragm of the cartridge pump cavity is limited through the sliding block, pumping operation is achieved, the pumping efficiency is high, the volume of pumped fluid is constant, and the pumping speed is stable.

Description

Technical Field

[0001] The present application relates to the technical field of hemodialysis, and in particular to a fluid delivery control system, a control method and a peritoneal dialysis device. Background Art

[0002] Automated peritoneal dialysis (APD) is used for patients with kidney disease. It uses the peritoneum as a semipermeable membrane for exchange. Dialysis fluid is injected into the patient's abdominal cavity and retained for a period of time before being excreted from the body. This helps the patient eliminate excess water and metabolic waste from the body and maintain a stable internal environment.

[0003] At present, automated peritoneal dialysis equipment integrates multiple fluid pathways, valves for controlling the switching of fluid pathways, and pump chambers through a cartridge, and uses a control system to control the opening and closing of the valves and drive the volume change of the pump chamber, so as to control the switching of different fluid pathways at different time periods to achieve the purpose of controlling fluid delivery.

[0004] The existing control system structure is relatively complex, and it is difficult to ensure the constant pumping volume. It is often impossible to compress the diaphragm of the pump chamber to the minimum position or restore it to the maximum position, resulting in an error between the volume of the pumped fluid and the preset value and fluctuations in the fluid flow rate. Summary of the invention

[0005] The purpose of the present application is to provide a fluid delivery control system, a control method and a peritoneal dialysis device to solve the problem that the gas circuit control system structure of the existing peritoneal dialysis equipment is relatively complex, and it is difficult to ensure the constant pumping volume by driving the pump cavity by air pressure, resulting in an error between the volume of the pumped fluid and the preset value, and the fluid flow rate fluctuates.

[0006] To achieve the above-mentioned object, the present application provides a fluid delivery control system in a first aspect, which is used for controlling a cassette for a peritoneal dialysis device, wherein the cassette is integrated with a plurality of fluid passages and a pump chamber connected to the plurality of fluid passages, and the opening of the pump chamber is closed by a diaphragm; the control system comprises a cam driving mechanism, and the cam driving mechanism comprises:

[0007] A drive wheel, operable to be rotatably disposed;

[0008] A slider, one end of which is linked to the driving wheel, and the other end of which is an active end that can be linked to the diaphragm of the pump chamber, and when the driving wheel rotates, the slider can be driven to perform linear reciprocating motion, so that the slider switches between a first posture and a second posture;

[0009] Among them, when the slider is in the first posture, the acting end restricts the diaphragm to a first position close to the bottom surface of the pump chamber to limit the minimum preset volume of the pump chamber, and when the slider is in the second posture, the acting end restricts the diaphragm to a second position away from the bottom surface of the pump chamber to limit the maximum preset volume of the pump chamber.

[0010] In one or more embodiments, at least one side surface of the driving wheel is provided with an annular sliding groove, the end of the slider is clamped on the driving wheel, and one end of the slider connected to the driving wheel is provided with a fixed shaft inserted into the sliding groove;

[0011] Wherein, the slide groove includes a first groove position farthest from the rotation axis of the driving wheel and a second groove position closest to the rotation axis of the driving wheel. When the slider is in the first posture, the fixed axis is located in the first groove position. When the slider is in the second posture, the fixed axis is located in the second groove position.

[0012] In one or more embodiments, a limiting groove is further provided at one end of the slider connected to the driving wheel, and when the slider switches between the first posture and the second posture, the driving wheel always fits in the limiting groove to limit its rotation plane.

[0013] In one or more embodiments, a vacuum cavity is provided inside the slider, and an adsorption port communicating with the vacuum cavity is provided at the active end of the slider, and the adsorption port can be attached to the diaphragm of the pump cavity.

[0014] In one or more embodiments, the cam driving mechanism further comprises a suction cup arranged at the action end of the slider, and a suction channel communicating with the vacuum chamber is formed in the suction cup.

[0015] Preferably, the cross-sectional area of ​​the adsorption channel is smaller than the opening area of ​​the adsorption port.

[0016] In one or more embodiments, the cam drive mechanism also includes a motor for driving the drive wheel and an absolute position sensor, wherein the absolute position sensor is used to detect the rotational position of the output shaft of the motor to identify the position of the slider and send a feedback signal when the slider moves to the first posture and the second posture.

[0017] In one or more embodiments, the cartridge further includes a plurality of opening and closing cavities connected to the plurality of fluid passages in a one-to-one correspondence, and the cartridge controls the opening and closing of the corresponding fluid passages through switch diaphragms of the opening and closing cavities; the control system further includes an air path control mechanism, and the air path control mechanism includes:

[0018] Positive pressure chamber;

[0019] Negative pressure chamber;

[0020] A plurality of switch valves correspond one to one with the plurality of opening and closing cavities, each of the switch valves comprises a control port acting on a switch diaphragm of the corresponding opening and closing cavity, a positive pressure action port connected to the positive pressure cavity, and a negative pressure action port connected to the negative pressure cavity, and the switch valve can be controlled to connect the positive pressure action port or the negative pressure action port with the control port so as to apply positive pressure or negative pressure to the switch diaphragm of the opening and closing cavity through the control port.

[0021] In one or more embodiments, the gas path control mechanism further includes:

[0022] A compressor, an input end of which is connected to the negative pressure chamber, and an output end of which is connected to the positive pressure chamber;

[0023] A negative pressure control valve is arranged on the connecting pipeline between the compressor and the negative pressure chamber;

[0024] The positive pressure control valve is arranged on the connecting pipeline between the compressor and the positive pressure chamber.

[0025] In one or more embodiments, the gas path control mechanism further includes:

[0026] A positive pressure sensor, used to detect the pressure of the positive pressure chamber and send a feedback signal when the pressure of the positive pressure chamber reaches a set value;

[0027] The negative pressure sensor is used to detect the pressure of the negative pressure chamber and send a feedback signal when the pressure of the negative pressure chamber reaches a set value.

[0028] In one or more embodiments, the air circuit control mechanism also includes a positive pressure switching valve, which is arranged on a connecting pipeline between the positive pressure chamber and the multiple switch valves. The positive pressure switching valve includes a positive pressure input port connected to the positive pressure chamber, a first positive pressure output port connected to the multiple switch valves, and a second positive pressure output port connected to the tube clamp airbag and the cassette airbag. The positive pressure switching valve can be controlled to connect the first positive pressure output port or the second positive pressure output port to the positive pressure chamber.

[0029] In one or more embodiments, the air circuit control mechanism also includes a negative pressure switching valve, which is arranged on a connecting pipeline between the negative pressure chamber and the multiple switch valves. The negative pressure switching valve includes a negative pressure input port connected to the negative pressure chamber, a first negative pressure output port connected to the multiple switch valves, and a second negative pressure output port connected to the slider action end. The negative pressure switching valve can be controlled to connect the first negative pressure output port or the second negative pressure output port to the negative pressure chamber.

[0030] In one or more embodiments, the gas path control mechanism further includes an adsorption pressure sensor, which is used to detect the adsorption force of the slider action end and feedback a signal when the adsorption force of the slider action end reaches a set value.

[0031] To achieve the above object, the second aspect of the present application provides a control method of the fluid delivery control system described in any one of the above embodiments, comprising:

[0032] Control the compressor to make the pressure of the positive pressure chamber and the negative pressure chamber reach the set value;

[0033] Switch the working port of the positive pressure switching valve to the second positive pressure output port to control the operation of the tube clamp airbag and the cartridge airbag, and switch the working port of the positive pressure switching valve to the first positive pressure output port after a preset time;

[0034] Switch the working port of the negative pressure switching valve to the second negative pressure output port until the adsorption force of the slider action end reaches the set value, and switch the working port of the negative pressure switching valve to the first negative pressure output port;

[0035] The motor is controlled to work, and during the working process of the motor, the working ports of the plurality of switch valves are intermittently switched according to a preset program to control the flow direction of the fluid according to the preset program.

[0036] In one or more embodiments, the step of controlling the compressor to operate so that the pressures of the positive pressure chamber and the negative pressure chamber reach set values ​​comprises:

[0037] Control the operation of the compressor, synchronously control the power supply of the negative pressure control valve and the positive pressure control valve, and obtain the signals of the positive pressure sensor and the negative pressure sensor in real time;

[0038] In response to a signal fed back by the positive pressure sensor, the positive pressure control valve is de-energized;

[0039] In response to the signal fed back by the negative pressure sensor, the negative pressure control valve is de-energized.

[0040] In one or more embodiments, the step of switching the working port of the negative pressure switching valve to the second negative pressure output port until the adsorption force pressure at the action end of the slider reaches a set value, and switching the working port of the negative pressure switching valve to the first negative pressure output port includes:

[0041] Switch the working port of the negative pressure switching valve to the second negative pressure output port to obtain the signal of the adsorption pressure sensor in real time;

[0042] In response to the signal fed back by the adsorption pressure sensor, the working port of the negative pressure switching valve is switched to the first negative pressure output port.

[0043] In one or more embodiments, the step of intermittently switching the working ports of the plurality of switch valves according to a preset program during the operation of the motor comprises:

[0044] Acquiring a signal fed back by an absolute position sensor in real time during operation of the motor;

[0045] In response to the signal fed back by the absolute position sensor, the working ports of the plurality of switch valves are switched according to a preset program.

[0046] To achieve the above-mentioned objective, the third aspect of the present application provides a peritoneal dialysis device, comprising the fluid delivery control system described in any one of the above-mentioned embodiments.

[0047] In one or more embodiments, a control mechanism is further included, and the control mechanism is used to execute the control method described in any of the above embodiments.

[0048] Different from the prior art, the beneficial effects of this application are:

[0049] The cam drive mechanism of the fluid delivery control system of the present application drives the slider to reciprocate linearly through the rotation of the driving wheel, and uses the slider to limit the diaphragm position of the cassette pump chamber to achieve pumping operation, with high pumping efficiency, constant volume of pumped fluid, and stable pumping speed;

[0050] The action end of the slider of the cam drive mechanism of the fluid delivery control system of the present application is fixed by adsorption force and the diaphragm adsorption of the cartridge pump chamber, further ensuring that the volume of the pumped fluid is constant and the pumping speed is stable;

[0051] The air path control mechanism of the fluid delivery control system of the present application effectively simplifies the air path structure by setting a positive pressure chamber and a negative pressure chamber, and realizes rapid opening and closing control of each fluid path;

[0052] The air path control mechanism of the fluid delivery control system of the present application cooperates with the cam drive mechanism to ensure the linkage between the action end of the slider and the pump chamber diaphragm during the pumping operation, thereby ensuring the constant volume of the pumped fluid and the stability of the pumping speed;

[0053] The control method of the fluid delivery control system of the present application ensures the adsorption stability of the slider action end and the pump chamber diaphragm and the fixing stability of the pipeline and the cassette during the pumping process, while limiting the switching control time of the switch valve to the end of the pumping cycle, thereby ensuring the precise and stable transmission of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0055] Figure 1 It is a structural schematic diagram of an implementation mode of a cam drive mechanism of the present application;

[0056] Figure 2 It is a structural schematic diagram of an implementation mode of the cam drive mechanism and the cartridge cooperating in the working state of the present application;

[0057] Figure 3 is a cross-sectional structural schematic diagram of an embodiment of the cam drive mechanism of the present application;

[0058] Figure 4 It is a structural schematic diagram of an embodiment of the present application when the slider is in a first posture;

[0059] Figure 5 It is a structural schematic diagram of an embodiment of the present application when the slider is in a second posture;

[0060] Figure 6 It is a structural schematic diagram of an implementation method of the gas path control mechanism of the present application;

[0061] Figure 7 It is a flow chart of an implementation method of the control method of the present application.

[0062] As shown in the figure:

[0063] Cam drive mechanism 1; drive wheel 10; slide slot 101; first slot 102; second slot 103; slider 11; fixed shaft 111; limit slot 112; vacuum chamber 113; suction port 114; motor 12; drive shaft 13; suction cup 14; suction channel 141;

[0064] Cartridge 2; pump chamber 20; diaphragm 201; opening and closing chamber 21; switch diaphragm 211;

[0065] Gas path control mechanism 3; positive pressure chamber 300; negative pressure chamber 301; switch valve 302; compressor 303; negative pressure control valve 304; positive pressure control valve 305; positive pressure sensor 306; negative pressure sensor 307; negative pressure switching valve 308; negative pressure input port 3081; first negative pressure output port 3082; second negative pressure output port 3083; adsorption pressure sensor 309; positive pressure switching valve 310; positive pressure input port 3101; first positive pressure output port 3102; second positive pressure output port 3103;

[0066] Tube clamp airbag 4;

[0067] Cassette airbag 5. DETAILED DESCRIPTION

[0068] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of this application.

[0069] In order to solve the problem that the control system of the current peritoneal dialysis device is complex in structure and difficult to ensure a constant pumping volume, the applicant has developed a fluid delivery control system that can be applied to the peritoneal dialysis device to control the fluid to be pumped into or out of the patient's abdominal cavity according to a preset program.

[0070] Specifically, the fluid delivery control system can be used to control a cassette of a peritoneal dialysis device. In an exemplary peritoneal dialysis device, the cassette is used as a medical consumable to integrate multiple fluid pathways, a pump chamber connected to the multiple fluid pathways, and an opening and closing chamber connected to the multiple fluid pathways one by one.

[0071] Among them, the opening of the pump chamber is closed by a diaphragm, and the opening of the opening and closing chamber is closed by an opening and closing diaphragm. The diaphragm is usually made of a flexible material, and can relatively protrude into the pump chamber or protrude out of the pump chamber. When the diaphragm protrudes into the pump chamber, it will be closer to the bottom surface of the pump chamber, thereby making the volume of the pump chamber smaller, and the fluid originally in the pump chamber will be pumped out through the opened fluid passage; similarly, when the diaphragm protrudes out of the pump chamber, it will be farther away from the bottom surface of the pump chamber, thereby making the volume of the pump chamber larger, and more fluid will be pumped into the pump chamber through the opened fluid passage. During the above pump chamber operation process, the opening and closing diaphragm of the opening and closing chamber cooperates to control the opening and closing of the corresponding fluid passage, so that the peritoneal dialysis device can introduce or draw out the fluid of the corresponding fluid passage into the patient's abdominal cavity according to a preset program during operation.

[0072] Exemplarily, the multiple fluid passages of the cassette can be respectively connected to the heating tube, the waste liquid tube, the infusion tube, the terminal bag tube and the patient end, so that the dialysate can be introduced into the patient's body in a controlled manner, using the patient's own peritoneum as a filter membrane, and utilizing the concentration gradient and osmotic pressure principles to remove waste and excess water in the body, and after a preset time, the waste liquid is led out of the patient's peritoneal cavity to complete the peritoneal dialysis operation.

[0073] The fluid delivery control system of the present application is described in detail below. First, the control system includes a cam drive mechanism that cooperates with the diaphragm of the pump chamber opening on the cartridge. Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of an embodiment of a cam drive mechanism of the present application, Figure 2 It is a structural schematic diagram of an implementation mode of the cam drive mechanism and the cartridge cooperating in the working state of the present application.

[0074] like Figure 1 and Figure 2 As shown, the cam drive mechanism 1 includes a driving wheel 10 and a slider 11, wherein the driving wheel 10 is rotatably arranged, one end of the slider 11 is linked to the driving wheel 10, and the other end is an active end that can be linked to the diaphragm 201 of the pump chamber 20.

[0075] When the driving wheel 10 is operatively rotated, the slider 11 may be driven to perform linear reciprocating motion, so that the slider 11 can be switched between the first posture and the second posture.

[0076] Specifically, when the slider 11 is in the first posture, its active end can limit the diaphragm to a first position close to the bottom surface of the pump chamber 20 to limit the minimum preset volume of the pump chamber 20. When the slider 11 is in the second posture, its active end limits the diaphragm 201 to a second position away from the bottom surface of the pump chamber 20 to limit the maximum preset volume of the pump chamber 20.

[0077] In this embodiment, the driving wheel 10 is driven and controlled to rotate by the motor 12 and the driving shaft 13. In other embodiments, the driving wheel 10 can also be rotationally controlled by other driving devices commonly used in the art, and the effect of this embodiment can be achieved.

[0078] It can be understood that the rotation of the driving wheel 10 can be converted into the linear reciprocating motion of the slider 11, thereby driving the diaphragm 201 to reciprocate between the first position and the second position, and controlling the volume of the pump chamber 20 to switch between the minimum preset volume and the maximum preset volume. In a cycle in which the pump chamber 20 is adjusted from the maximum preset volume to the minimum preset volume, the pumping volume is the difference between the maximum preset volume and the minimum preset volume, thereby achieving the purpose of pumping fluid.

[0079] Among them, the minimum preset volume and the maximum preset volume of the pump chamber 20 can be set, which can be adjusted accordingly based on the actual working conditions by limiting the maximum stroke of the slider 11 or the maximum rotation angle of the motor 12, or by designing a cassette 2 with different pump chamber 20 sizes based on different scenarios to complete the adjustment of the pumping volume.

[0080] In order to achieve precise positioning of the slider 11 and improve the accuracy of the pumping volume, the cam drive mechanism 1 in this embodiment may also include an absolute position sensor (not shown in the figure) for detecting the rotation angle of the rotating shaft of the motor 12. The absolute position sensor can determine the position of the slider 11 based on the rotation angle of the rotating shaft of the motor 12, and feedback signals when the slider 11 is in the first posture and the second posture.

[0081] It should be noted that in other embodiments, the position of the slider 11 can also be detected based on a sensor that directly identifies the position of the slider 11, or a sensor that directly identifies the rotation angle of the drive wheel 10, or other types of sensors that can be used to identify the rotation angle of the motor 12, all of which can achieve the effect of the present embodiment.

[0082] The following describes the connection structure between the driving wheel 10 and the slider 11 of the present application. Figures 1 to 3 , Figure 3 It is a schematic cross-sectional structural diagram of an embodiment of the cam drive mechanism of the present application.

[0083] like Figures 1 to 3 As shown, in this embodiment, an annular groove 101 is arranged on both sides of the driving wheel 10. The groove 101 is a non-circular structure, which includes a first groove position 102 farthest from the rotation axis of the driving wheel 10 and a second groove position 103 closest to the rotation axis of the driving wheel 10.

[0084] The end of the slider 11 is clamped on the driving wheel 10 , and one end of the slider 11 connected to the driving wheel 10 is provided with a fixed shaft 111 inserted into the sliding groove 101 .

[0085] When the driving wheel 10 rotates, it can drive the fixed shaft 111 to slide along the slide groove 101, so that the fixed shaft 111 can alternately pass through the first slot 102 and the second slot 103, thereby driving the slider 11 to perform linear reciprocating motion. Specifically, when the cam driving mechanism 1 is applied to a peritoneal dialysis device, the slider 11 can be arranged in a sliding sleeve fixed beside the cassette 2, and the sliding sleeve can limit the movement direction of the slider 11, so that the slider 11 can perform linear reciprocating motion close to the pump chamber 20 and away from the pump chamber 20.

[0086] See also Figure 4 and Figure 5 , Figure 4 is a structural schematic diagram of an embodiment of the present application when the slider is in a first posture, Figure 5 It is a structural schematic diagram of an implementation mode of the present application when the slider is in the second posture.

[0087] like Figure 4 and Figure 5As shown, when the slider 11 is in the first posture, the fixed shaft 111 is located in the first slot 102. At this time, the slider 11 is located at the farthest position from the rotation axis of the driving wheel 10, and the diaphragm 201 of the pump chamber 20 can be confined to the first position, and the volume of the pump chamber 20 is the preset minimum volume; when the slider 11 is in the second posture, the fixed shaft 111 is located in the second slot 103, and the slider 11 is located at the closest position to the rotation axis of the driving wheel 10. The diaphragm 201 of the pump chamber 20 can be confined to the second position, and the volume of the pump chamber 20 is the preset maximum volume.

[0088] In this embodiment, the first slot 102 and the second slot 103 can be located at opposite ends of the slide groove 101. Every time the driving wheel 10 rotates half a circle, the volume of the pump chamber 20 can be switched between the maximum preset volume and the minimum preset volume, completing a pumping operation.

[0089] The cam drive mechanism 1 based on the above structure can effectively improve the pumping efficiency. At the same time, the control of the diaphragm 201 based on the slider 11 can also ensure the position accuracy of the diaphragm 201, which helps to maintain a constant pumping volume.

[0090] Furthermore, in the present embodiment, a limiting groove 112 is also provided at one end of the slider 11 connected to the driving wheel 10. When the slider 11 switches between the first posture and the second posture, the driving wheel 10 is always engaged in the limiting groove 112 to limit its rotation plane, thereby ensuring the stability of the cooperation between the two.

[0091] It should be noted that, in the present embodiment, the shape of the driving wheel 10 is arranged to be the same as the slide groove 101. In other embodiments, the driving wheel 10 may also be any other shape, which can also achieve the effect of the present embodiment; in addition, in the present embodiment, the slide grooves 101 are arranged on both side surfaces of the driving wheel 10. In other embodiments, the slide groove 101 may be arranged on only one side surface of the driving wheel 10, which can ensure that the slider 11 can follow the movement of the driving wheel 10, which can also achieve the effect of the present embodiment.

[0092] Furthermore, in order to ensure that the slider 11 can be linked with the diaphragm 201 of the pump chamber 20 and improve the stability of the pumping volume, as Figure 3 As shown, a vacuum chamber 113 is further provided inside the slider 11 , and an adsorption port 114 communicating with the vacuum chamber 113 is provided at the active end of the slider 11 . The adsorption port 114 can fit with the diaphragm 201 of the pump chamber 20 , thereby ensuring that the diaphragm 201 can follow the movement of the slider 11 .

[0093] Furthermore, the suction port 114 of the slider 11 is also provided with a suction cup 14 , and an adsorption channel 141 connected to the vacuum chamber 113 is formed inside the suction cup 14 . The suction cup 14 may be made of a flexible material and may fit tightly with the diaphragm 201 , thereby improving the fixing stability of the slider 11 and the diaphragm 201 .

[0094] In this embodiment, in order to improve the contact stability between the suction cup 14 and the membrane 201 , the cross-sectional area of ​​the suction channel 141 can be set to be smaller than the opening area of ​​the suction port 114 , thereby providing a greater suction force for the suction cup 14 .

[0095] The cam drive mechanism 1 based on the above embodiments can achieve accurate and rapid adjustment of the volume of the pump chamber 20, so as to achieve stable pumping of a constant volume. In order to synchronously open and close each fluid passage, the fluid delivery control system of the present application also includes an air passage control mechanism 3.

[0096] Specifically, see Figure 6 , Figure 6 It is a structural schematic diagram of an implementation scheme of the gas path control mechanism of the present application.

[0097] like Figure 6 As shown, the gas path control mechanism 3 includes a positive pressure chamber 300 , a negative pressure chamber 301 and a plurality of switch valves 302 .

[0098] Among them, the positive pressure chamber 300 is used to provide positive pressure for the diaphragm 201 of the opening and closing chamber 21 of the cartridge 2, and the negative pressure chamber 301 is used to provide negative pressure for the diaphragm 201 of the opening and closing chamber 21 of the cartridge 2. In one embodiment, the pressure of the positive pressure chamber 300 can be 50~60kPa, and the pressure of the negative pressure chamber 301 can be -50~-60kPa.

[0099] Multiple switch valves 302 and multiple opening and closing chambers 21 are applied one by one to apply positive pressure or negative pressure to the switch diaphragm 211 of the opening and closing chamber 21. Specifically, each switch valve 302 includes a control port acting on the switch diaphragm 211 of the corresponding opening and closing chamber 21, a positive pressure action port connected to the positive pressure chamber 300, and a negative pressure action port connected to the negative pressure chamber 301. The switch valve 302 can be controlled to connect the positive pressure action port or the negative pressure action port with the control port, so as to apply positive pressure or negative pressure to the switch diaphragm 211 of the opening and closing chamber 21 through the control port.

[0100] Based on the above-mentioned air path control mechanism 3, the two switch valves 302 can be controlled at each moment to apply negative pressure to the switch diaphragm 211 of the corresponding opening and closing chamber 21, thereby controlling the opening of the corresponding two fluid paths; and apply positive pressure to the switch diaphragm 211 of other opening and closing chambers 21, thereby controlling the closing of other fluid paths; as the volume of the pump chamber 20 changes, the fluid can be controlled to be pumped from one fluid path to another fluid path.

[0101] By presetting the positive pressure chamber 300 and the negative pressure chamber 301 , the gas path structure can be effectively simplified, and rapid opening and closing control of each fluid path can be achieved.

[0102] Furthermore, the present embodiment also includes a compressor 303 arranged between the positive pressure chamber 300 and the negative pressure chamber 301, the input end of the compressor 303 is connected to the negative pressure chamber 301, and the output end is connected to the positive pressure chamber 300; a negative pressure control valve 304 is arranged on the connecting pipeline between the compressor 303 and the negative pressure chamber 301; and a positive pressure control valve 305 is arranged on the connecting pipeline between the compressor 303 and the positive pressure chamber 300.

[0103] It can be understood that when the negative pressure control valve 304 and the positive pressure control valve 305 are both powered on and opened, the compressor 303 can extract air from the negative pressure chamber 301 and transport it to the positive pressure chamber 300, thereby simultaneously achieving the negative pressure of the negative pressure chamber 301 and the positive pressure of the positive pressure chamber 300 to meet the set values; and when the pressure of the negative pressure chamber 301 or the pressure of the positive pressure chamber 300 does not reach the set value, the negative pressure control valve 304 or the positive pressure control valve 305 can be opened separately, and the compressor 303 can be controlled to work, so that both the negative pressure chamber 301 and the positive pressure chamber 300 can meet the setting.

[0104] In order to facilitate the pressure control of the positive pressure chamber 300 and the negative pressure chamber 301, the air path control mechanism 3 in this embodiment also includes a positive pressure sensor 306 and a negative pressure sensor 307: the positive pressure sensor 306 is used to detect the pressure of the positive pressure chamber 300, and sends a feedback signal when the pressure of the positive pressure chamber 300 reaches a set value; the negative pressure sensor 307 is used to detect the pressure of the negative pressure chamber 301, and sends a feedback signal when the pressure of the negative pressure chamber 301 reaches a set value.

[0105] Furthermore, in order to enable the air path control mechanism 3 to control the adsorption of the suction cup 14 of the cam drive mechanism 1 and the diaphragm 201 , the air path control mechanism 3 in this embodiment further includes a negative pressure switching valve 308 .

[0106] The negative pressure switching valve 308 is arranged on the connecting pipeline between the negative pressure chamber 301 and the multiple switch valves 302. The negative pressure switching valve 308 includes a negative pressure input port 3081 connected to the negative pressure chamber 301, a first negative pressure output port 3082 connected to the multiple switch valves 302, and a second negative pressure output port 3083 connected to the vacuum chamber 113 of the slider 11. The negative pressure switching valve 308 can be controlled to connect the first negative pressure output port 3082 or the second negative pressure output port 3083 with the negative pressure chamber 301.

[0107] It can be understood that before starting the pumping operation, the negative pressure switching valve 308 can switch the working port to the second negative pressure output port 3083. At this time, the second negative pressure output port 3083 is connected to the negative pressure chamber 301, and the negative pressure is applied to the vacuum chamber 113 of the slider 11, thereby realizing the adsorption of the suction cup 14 on the diaphragm 201 of the pump chamber 20.

[0108] After the adsorption is completed, the negative pressure switching valve 308 can switch the working port to the first negative pressure output port 3082. At this time, the first negative pressure output port 3082 is connected to multiple switch valves 302. The negative pressure can be applied to the switch diaphragm 211 of the opening and closing cavity 21 of the cartridge 2 through the control of the switch valve 302 to realize the opening and closing control of the fluid passage, ensuring that the slider 11 can be linked with the diaphragm 201 of the pump cavity 20 during operation.

[0109] In order to further ensure the adsorption force between the suction cup 14 of the slider 11 and the diaphragm 201 of the pump chamber 20, the air circuit control mechanism 3 also includes an adsorption pressure sensor 309, which is used to detect the adsorption force at the working end of the slider 11 and feedback a signal when the adsorption force at the working end of the slider 11 reaches a set value.

[0110] In order to ensure that the cartridge 2 and the pipeline are fixed and stable during the pumping operation, the air path control mechanism 3 in this embodiment further includes a positive pressure switching valve 310 .

[0111] The positive pressure switching valve 310 is arranged on the connecting pipeline between the positive pressure chamber 300 and multiple switch valves 302. The positive pressure switching valve 310 includes a positive pressure input port 3101 connected to the positive pressure chamber 300, a first positive pressure output port 3102 connected to the multiple switch valves 302, and a second positive pressure output port 3103 connected to the tube clamp airbag 4 and the cartridge airbag 5. The positive pressure switching valve 310 can be controlled to connect the first positive pressure output port 3102 or the second positive pressure output port 3103 with the positive pressure chamber 300.

[0112] It can be understood that before starting the pumping operation, the positive pressure switching valve 310 can switch the working port to the second positive pressure output port 3103. At this time, the second positive pressure output port 3103 is connected to the positive pressure chamber 300, and the positive pressure is applied to the tube clamp airbag 4 and the cartridge airbag 5, and the tube clamp airbag 4 and the cartridge airbag 5 are inflated to ensure the fixation and stability of the pipeline and the cartridge 2.

[0113] After completing the fixation of the pipeline and the cartridge 2, the positive pressure switching valve 310 can switch the working port to the first positive pressure output port 3102. At this time, the first positive pressure output port 3102 is connected to multiple switch valves 302. The positive pressure can be applied to the switch diaphragm 211 of the opening and closing cavity 21 of the cartridge 2 through the control of the switch valve 302, thereby realizing the opening and closing control of the fluid passage, and ensuring the stable fixation of the pipeline and the cartridge 2 during operation.

[0114] The fluid delivery control system based on the above-mentioned embodiments can control the cassette 2 of the peritoneal dialysis device, and pump the fluid into the patient's abdominal cavity and out of the patient's abdominal cavity at a stable flow rate and precise volume according to a preset process, thereby reducing the patient's discomfort.

[0115] The present application also provides a control method for a fluid delivery control system in any of the above embodiments. Figure 7 , Figure 7 It is a flow chart of an implementation method of the control method of the present application.

[0116] like Figure 7 As shown, the control method includes:

[0117] S100, controlling the compressor to operate so that the pressures of the positive pressure chamber and the negative pressure chamber reach set values.

[0118] Specifically, the method of adjusting the pressure of the positive pressure chamber 300 and the negative pressure chamber 301 to a set value includes:

[0119] Control the compressor 303 to work, synchronously control the negative pressure control valve 304 and the positive pressure control valve 305 to be energized, and obtain the signals of the positive pressure sensor 306 and the negative pressure sensor 307 in real time;

[0120] In response to the signal fed back by the positive pressure sensor 306, the positive pressure control valve 305 is de-energized;

[0121] In response to the signal fed back by the negative pressure sensor 307 , the negative pressure control valve 304 is de-energized.

[0122] It can be understood that when the pressure of the positive pressure chamber 300 reaches the set value, the positive pressure sensor 306 feedbacks a signal, and at this time the positive pressure control valve 305 can be powered off, and the compressor 303 continues to extract the gas inside the negative pressure chamber 301 from the outside until the pressure of the negative pressure chamber 301 reaches the set value;

[0123] When the pressure in the negative pressure chamber 301 reaches the set value, the negative pressure sensor 307 feeds back a signal, and the negative pressure control valve 304 can be powered off at this time, and the compressor 303 continues to inject gas from the outside into the positive pressure chamber 300 until the pressure in the positive pressure chamber 300 reaches the set value.

[0124] S200, switching the working port of the positive pressure switching valve to the second positive pressure output port, controlling the tube clamp airbag and the cartridge airbag to operate, and switching the working port of the positive pressure switching valve to the first positive pressure output port after a preset time.

[0125] After the pressure in the positive pressure chamber 300 reaches the set value, the working port of the positive pressure switching valve 310 can be switched to the second positive pressure output port 3103. At this time, the positive pressure chamber 300 is connected to the tube clamp airbag 4 and the cassette airbag 5, and air is inflated into the tube clamp airbag 4 and the cassette airbag 5 to fix the pipeline and the cassette 2.

[0126] After the preset time, the working port of the positive pressure switching valve 310 is switched to the first positive pressure output port 3102. At this time, the positive pressure chamber 300 is connected to the switch valve 302, and the positive pressure can act on the switch diaphragm 211 of the opening and closing chamber 21 of the cartridge 2 through the switch valve 302.

[0127] S300, switching the working port of the negative pressure switching valve to the second negative pressure output port until the adsorption force of the slider action end reaches a set value, and switching the working port of the negative pressure switching valve to the first negative pressure output port.

[0128] After the pressure in the negative pressure chamber 301 reaches the set value, the working port of the negative pressure switching valve 308 can be switched to the second negative pressure output port 3083 . At this time, the negative pressure chamber 301 is connected to the vacuum chamber 113 inside the slider 11 , and the suction cup 14 is adsorbed and fitted to the diaphragm 201 .

[0129] After the adsorption force at the action end of the slider 11 reaches the set value, the adsorption pressure sensor 309 feedbacks a signal. After receiving the feedback signal, the working port of the negative pressure switching valve 308 can be switched to the first negative pressure output port 3082. At this time, the negative pressure chamber 301 is connected to the switch valve 302, and the negative pressure can act on the switch diaphragm 211 of the opening and closing chamber 21 of the cartridge 2 through the switch valve 302.

[0130] S400, controlling the motor to work, and intermittently switching the working ports of the plurality of switch valves according to a preset program during the motor operation to control the fluid flow direction according to the preset program.

[0131] After the pipeline and the cartridge 2 are fixed, and the suction cup 14 of the slider 11 is adsorbed onto the diaphragm 201, the motor 12 can be controlled to start the pumping operation, and the fluid passage can be opened and closed in sequence according to a preset program to pump the fluid into the patient's abdominal cavity and out of the patient's abdominal cavity.

[0132] In order to ensure the consistency of fluid passage opening and closing control and fluid pumping control and avoid the phenomenon of fluid passage opening and closing during the pumping process, the method of switching the working port of the switch valve 302 may include:

[0133] Acquire the feedback signal of the absolute position sensor in real time during the operation of the motor 12;

[0134] In response to the feedback signal of the absolute position sensor, the working ports of the plurality of switch valves 302 are switched according to a preset program.

[0135] Based on the above scheme, the absolute position sensor obtains the rotational position of the rotating shaft of the motor 12 in real time. Based on the rotational position of the rotating shaft of the motor 12, the real-time position of the slider 11 can be obtained. When the slider 11 is in the first posture or the second posture, the absolute position sensor feedbacks a signal. At this time, the volume of the pump chamber 20 is at the maximum preset volume or the minimum preset volume. A cycle of pumping operation is completed, and the switching control of the switch valve 302 can be performed to ensure accurate and stable transmission of the fluid.

[0136] The present application also provides a peritoneal dialysis device using the fluid delivery control system of each of the above-mentioned embodiments, wherein the peritoneal dialysis device controls the volume of the pump chamber 20 of the cartridge 2 through the cam drive mechanism 1 to achieve a pumping operation, and applies positive pressure or negative pressure to the switch diaphragm 211 of the opening and closing chamber 21 of the cartridge 2 through the air path control mechanism 3 to control the opening and closing of the corresponding fluid path, thereby pumping the fluid into the patient's abdominal cavity at a stable flow rate and precise volume according to a preset process, and operating the fluid to be drawn out from the patient's abdominal cavity.

[0137] For those skilled in the art, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0138] The foregoing description of the specific exemplary embodiments of the present application is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present application to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present application and its practical application, so that those skilled in the art can realize and utilize the various exemplary embodiments of the present application and various selections and changes. The scope of the present application is intended to be limited by the claims and their equivalents.

Claims

1. A fluid delivery control system, characterized in that: A control device for a cassette for a peritoneal dialysis device, wherein the cassette is integrated with a plurality of fluid passages and a pump chamber connected to the plurality of fluid passages, and an opening of the pump chamber is closed by a diaphragm; The control system includes a cam drive mechanism, and the cam drive mechanism includes: A drive wheel, operable to be rotatably disposed; A slider, one end of which is linked to the driving wheel, and the other end of which is an active end that can be linked to the diaphragm of the pump chamber, and when the driving wheel rotates, the slider can be driven to perform linear reciprocating motion, so that the slider switches between a first posture and a second posture; Among them, when the slider is in the first posture, the acting end restricts the diaphragm to a first position close to the bottom surface of the pump chamber to limit the minimum preset volume of the pump chamber, and when the slider is in the second posture, the acting end restricts the diaphragm to a second position away from the bottom surface of the pump chamber to limit the maximum preset volume of the pump chamber.

2. The fluid delivery control system according to claim 1, characterized in that: An annular sliding groove is arranged on at least one side surface of the driving wheel, the end of the slider is clamped on the driving wheel, and the end of the slider connected to the driving wheel is arranged with a fixed shaft inserted into the sliding groove; Wherein, the slide groove includes a first groove position farthest from the rotation axis of the driving wheel and a second groove position closest to the rotation axis of the driving wheel. When the slider is in the first posture, the fixed axis is located in the first groove position. When the slider is in the second posture, the fixed axis is located in the second groove position.

3. The fluid delivery control system according to claim 2, characterized in that: A limiting groove is further provided at one end of the slider connected to the driving wheel. When the slider switches between the first posture and the second posture, the driving wheel always fits in the limiting groove to limit its rotation plane.

4. The fluid delivery control system according to claim 1, characterized in that: A vacuum cavity is arranged inside the slider, and an adsorption port communicating with the vacuum cavity is arranged at the action end of the slider, and the adsorption port can be attached to the diaphragm of the pump cavity.

5. The fluid delivery control system according to claim 4, characterized in that: The cam driving mechanism further comprises a suction cup arranged at the action end of the slider, wherein a suction channel communicating with the vacuum chamber is formed in the suction cup; Preferably, the cross-sectional area of ​​the adsorption channel is smaller than the opening area of ​​the adsorption port.

6. The fluid delivery control system according to claim 1, characterized in that: The cam drive mechanism also includes a motor for driving the drive wheel and an absolute position sensor, wherein the absolute position sensor is used to detect the rotation position of the output shaft of the motor to identify the position of the slider and send a feedback signal when the slider moves to the first posture and the second posture.

7. The fluid delivery control system according to claim 1, characterized in that: The cartridge further comprises a plurality of opening and closing cavities connected to the plurality of fluid passages in a one-to-one correspondence, and the cartridge controls the opening and closing of the corresponding fluid passages through the switch membranes of the opening and closing cavities; The control system further includes an air path control mechanism, and the air path control mechanism includes: Positive pressure chamber; Negative pressure chamber; A plurality of switch valves correspond one to one with the plurality of opening and closing cavities, each of the switch valves comprises a control port acting on a switch diaphragm of the corresponding opening and closing cavity, a positive pressure action port connected to the positive pressure cavity, and a negative pressure action port connected to the negative pressure cavity, and the switch valve can be controlled to connect the positive pressure action port or the negative pressure action port with the control port so as to apply positive pressure or negative pressure to the switch diaphragm of the opening and closing cavity through the control port.

8. The fluid delivery control system according to claim 7, characterized in that: The gas path control mechanism also includes: A compressor, an input end of which is connected to the negative pressure chamber, and an output end of which is connected to the positive pressure chamber; A negative pressure control valve is arranged on the connecting pipeline between the compressor and the negative pressure chamber; The positive pressure control valve is arranged on the connecting pipeline between the compressor and the positive pressure chamber.

9. The fluid delivery control system according to claim 7, characterized in that: The gas path control mechanism also includes: A positive pressure sensor, used to detect the pressure of the positive pressure chamber and send a feedback signal when the pressure of the positive pressure chamber reaches a set value; The negative pressure sensor is used to detect the pressure of the negative pressure chamber and send a feedback signal when the pressure of the negative pressure chamber reaches a set value.

10. The fluid delivery control system according to claim 7, characterized in that: The air path control mechanism also includes a positive pressure switching valve, which is arranged on a connecting pipeline between the positive pressure chamber and the multiple switch valves. The positive pressure switching valve includes a positive pressure input port connected to the positive pressure chamber, a first positive pressure output port connected to the multiple switch valves, and a second positive pressure output port connected to the tube clamp airbag and the cassette airbag. The positive pressure switching valve can be controlled to connect the first positive pressure output port or the second positive pressure output port with the positive pressure chamber.

11. The fluid delivery control system according to claim 7, characterized in that: The air circuit control mechanism also includes a negative pressure switching valve, which is arranged on a connecting pipeline between the negative pressure chamber and the multiple switch valves. The negative pressure switching valve includes a negative pressure input port connected to the negative pressure chamber, a first negative pressure output port connected to the multiple switch valves, and a second negative pressure output port connected to the action end of the slider. The negative pressure switching valve can be controlled to connect the first negative pressure output port or the second negative pressure output port with the negative pressure chamber.

12. The fluid delivery control system according to claim 11, characterized in that: The gas path control mechanism further includes an adsorption pressure sensor, which is used to detect the adsorption force of the action end of the slider and to feedback a signal when the adsorption force of the action end of the slider reaches a set value.

13. A control method for a fluid delivery control system according to any one of claims 1 to 12, characterized in that: include: Control the compressor to make the pressure of the positive pressure chamber and the negative pressure chamber reach the set value; Switch the working port of the positive pressure switching valve to the second positive pressure output port to control the operation of the tube clamp airbag and the cartridge airbag, and switch the working port of the positive pressure switching valve to the first positive pressure output port after a preset time; Switch the working port of the negative pressure switching valve to the second negative pressure output port until the adsorption force of the slider action end reaches the set value, and switch the working port of the negative pressure switching valve to the first negative pressure output port; The motor is controlled to work, and during the working process of the motor, the working ports of the plurality of switch valves are intermittently switched according to a preset program to control the flow direction of the fluid according to the preset program.

14. The control method according to claim 13, characterized in that: The step of controlling the compressor to work so that the pressures of the positive pressure chamber and the negative pressure chamber reach set values ​​comprises: Control the operation of the compressor, synchronously control the power supply of the negative pressure control valve and the positive pressure control valve, and obtain the signals of the positive pressure sensor and the negative pressure sensor in real time; In response to a signal fed back by the positive pressure sensor, the positive pressure control valve is de-energized; In response to the signal fed back by the negative pressure sensor, the negative pressure control valve is de-energized.

15. The control method according to claim 13, characterized in that: The step of switching the working port of the negative pressure switching valve to the second negative pressure output port until the adsorption force of the slider action end reaches a set value, and switching the working port of the negative pressure switching valve to the first negative pressure output port includes: Switch the working port of the negative pressure switching valve to the second negative pressure output port to obtain the signal of the adsorption pressure sensor in real time; In response to the signal fed back by the adsorption pressure sensor, the working port of the negative pressure switching valve is switched to the first negative pressure output port.

16. The control method according to claim 13, characterized in that: The step of intermittently switching the working ports of the plurality of switch valves according to a preset program during the operation of the motor comprises: Acquiring a signal fed back by an absolute position sensor in real time during operation of the motor; In response to the signal fed back by the absolute position sensor, the working ports of the plurality of switch valves are switched according to a preset program.

17. A peritoneal dialysis device, characterized in that: A fluid delivery control system comprising any one of claims 1 to 12.

18. The peritoneal dialysis device according to claim 17, characterized in that It also includes a control mechanism, which is used to execute the control method described in any one of claims 13 to 16.

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