A clamp control system, circuit and peritoneal dialysis machine

Abstract

The utility model relates to peritoneal dialysis technical field, concretely is a kind of pinch control system, circuit and peritoneal dialysis machine. Pinch control system includes pinch device, and pinch device includes MCU control unit, motor drive unit, motor action unit, position detection unit and dialysate pipeline unit;MCU control unit is used to emit motor control signal to motor drive unit;Motor drive unit is used to drive motor movement unit's movement and monitor motor movement unit's current signal, and feedback current signal;Position detection unit is used to detect and feedback motor movement unit's movement position;MCU control unit is according to movement position trigger signal and current signal to control the motor drive unit to the dialysate pipeline unit's tightening and release. The utility model is detected pinch state by switch signal and current signal simultaneously, realizes no delay, more accurate pinch control;Overall control is simple, and cost is low, and noise is small.

Description

Technical Field

[0001] This utility model relates to the field of peritoneal dialysis technology, specifically to a clamping control system, circuit, and peritoneal dialysis machine. Background Technology

[0002] A peritoneal dialysis machine is a medical device that infuses dialysate into a patient's peritoneal cavity, utilizes the properties of the peritoneal semipermeable membrane for dialysis, and then removes the fluid from the peritoneal cavity. When using a peritoneal dialysis machine, the dialysis process needs to be monitored online. In case of emergencies or after dialysis is completed, the tubing needs to be disconnected.

[0003] Currently, the clamping devices of peritoneal dialysis machines on the market mainly use solenoid valves or motors with spring structures to achieve the closing and opening of the peritoneal dialysis machine tubing.

[0004] For example, Chinese invention patent application CN104027855A discloses a peritoneal dialysis machine in conjunction with CAPD, including a heating device, a weighing device, a drug drainage and injection device, and a worktable. The worktable has a bracket and an electrical box, which houses a control system. The heating device is located on the upper part of the bracket, and the weighing device is located on the worktable below the electrical box. The drug drainage and injection device includes a drainage clamp solenoid valve, an injection clamp solenoid valve, and a flexible tube. Both the drainage and injection clamp solenoid valves are located on the upper surface of the electrical box, and the injection clamp solenoid valve has the same structure as the drainage clamp solenoid valve. The solenoid valves in this peritoneal dialysis machine require certain internal pressure conditions to trigger, which limits their opening and closing control. This results in high noise levels, overheating, high cost, control delays, and the possibility of leakage due to insufficient clamping. Utility Model Content

[0005] To overcome the problems existing in the prior art, the purpose of this utility model is to provide a clamping control system, circuit and peritoneal dialysis machine.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a tube clamping control system, comprising at least one tube clamping device, each tube clamping device comprising an MCU control unit, a motor drive unit, a motor actuation unit, a position detection unit, and a dialysate pipeline unit; The motor drive unit and the position detection unit are electrically connected to the MCU control unit, respectively; The MCU control unit is used to transmit motor control signals to the motor drive unit; The motor drive unit is used to receive motor control signals to drive the movement of the motor motion unit. The motor drive unit is also used to monitor the current signal I of the motor motion unit. 阀 and the current signal I 阀 Feedback is sent to the MCU control unit; The position detection unit is used to detect the movement position of the motor motion unit and feed back the movement position trigger signal to the MCU control unit; The MCU control unit is based on the motion position trigger signal and the current signal I. 阀 This is used to control the tightening and loosening of the dialysate tubing unit by the motor drive unit.

[0007] The present invention is further configured such that: the position detection unit includes a push rod switch, the push rod switch includes a start switch and an end switch, and the movement position of the motor movement unit is determined by triggering the start switch or the end switch through the motor movement unit.

[0008] This utility model also provides a tube clamping control circuit, which is used in conjunction with the above-mentioned tube clamping control system; it includes an MCU control unit, a motor drive unit, and a position detection unit. The motor drive unit includes a controller U14, a drive module, a drive signal input module, and a current signal output module; the drive module includes a motor and a connector J18; the OUT1 and OUT2 ports of the controller U14 are connected to the motor through the connector J18. The controller U14 is connected to the MCU control unit via a drive signal input module for transmitting device start / stop or state switching commands; the current signal output module is connected to the MCU control unit for outputting current signal I. 阀 ; The position detection unit's switch signal ports MOTOR_START and MOTOR_END are connected to the MCU control unit. The MCU control unit communicates with the MCU control unit via switch signals and current signals I. 阀 Determine the clamp control status.

[0009] The present invention is further configured such that: the driving module also includes magnetic bead FB7, magnetic bead FB8, capacitor C135, capacitor C140, capacitor C141, diode D1 and diode D2; The port OUT1 of the controller U14 is connected to the first end of the magnetic bead FB8. The second end of the magnetic bead FB8 is connected in sequence to the first end of the capacitor C141 and the diode D2, and is connected to the motor through the connector J18. The second ends of the capacitor C141 and the diode D2 are grounded. The port OUT2 of the controller U14 is connected to the first end of the magnetic bead FB7. The second end of the magnetic bead FB7 is connected in sequence to the first ends of capacitor C140, capacitor C135 and diode D1, and is connected to the motor through connector J18. The second ends of capacitor C140 and diode D1 are grounded, and the second end of capacitor C135 is connected between the first ends of capacitor C141 and diode D2.

[0010] The present invention is further configured such that: the current signal output module includes resistor R121, resistor R125, resistor R124 and capacitor C133; The port PMODE of the controller U14 is connected to the first end of the resistor R121, and the second end of the resistor R121 is connected to the power supply VCC-3V3. The IPROPI port of the controller U14 is connected to the first end of resistor R125. The second end of resistor R125 is connected to the first end of resistor R124. The second end of resistor R124 is connected to the first end of capacitor C133. The controller U14 is connected to the MCU control unit through the current signal output port MOTOR_CURRENT_ADC. The second end of capacitor C133 is grounded.

[0011] The present invention is further configured such that: the drive signal input module includes resistor R122, resistor R123, connection port MOTOR_IN1 and connection port MOTOR_IN2; the ENIN1 port of controller U14 is connected to the connection port MOTOR_IN1 with resistor R123 in series, and the ENIN1 port of controller U14 is connected to the connection port MOTOR_IN2 with resistor R122 in series.

[0012] The present invention is further configured such that: the motor drive unit further includes a power input module, the power input module including capacitor C131, resistor R118, capacitor C132, capacitor C134, capacitor C136, capacitor C137, capacitor C138 and capacitor C139. The capacitor C132 is connected between port CPL and port CPH of the controller U14; The VREF port of the controller U14 is connected to the first end of the resistor R118 and the capacitor C131 respectively. The second end of the resistor R118 is connected to the power supply VCC-3V3, and the second end of the capacitor C131 is grounded. The controller U14's port VCP is connected to the first end of capacitor C134, and the controller U14's port VM is connected to the second end of capacitor C134. The second end of capacitor C134 is connected in parallel with capacitors C136, C137, C138, and C139, and then connected to the power supply VCC-MOTOR. Capacitors C136, C137, C138, and C139 are all grounded.

[0013] The present invention is further configured such that the position detection unit includes connector J19, diode D36, diode D37, resistor R126, resistor R127, capacitor C142, and capacitor C143. The position detection unit is connected to the push switch via connector J19. The first and fourth ports of connector J19 are grounded. The second port of connector J19 is connected to the first end of diode D36, resistor R126 and capacitor C142 in sequence, and then connected to the switch signal port MOTOR_START. The second ends of diode D36 and capacitor C142 are grounded respectively, and the second end of resistor R126 is connected to power supply VCC-3V3. After the third port of connector J19 is connected to the first end of diode D37, resistor R127 and capacitor C143 in sequence, it is connected to the switch signal port MOTOR_END; the second ends of diode D37 and capacitor C143 are grounded respectively, and the second end of resistor R127 is connected to power supply VCC-3V3.

[0014] The present invention is further configured such that: the motor drive unit further includes resistor R119 and resistor R120; the port nFAULT of the controller U14 is connected to the first end of resistor R119, and the second end of resistor R119 is connected to power supply VCC-3V3; the port nSLEEP of the controller U14 is connected to the first end of resistor R120, and the second end of resistor R120 is connected to power supply VCC-3V3.

[0015] This utility model also relates to a peritoneal dialysis machine, including the above-mentioned tube clamping control system.

[0016] This utility model also relates to a peritoneal dialysis machine, including the above-mentioned tube clamping control circuit.

[0017] In summary, the beneficial effects of the above-mentioned technical solution of this utility model are as follows: This invention utilizes an MCU control unit to simultaneously detect the clamping status via switch and current signals, achieving more accurate clamping control with no delay. The overall control is simple, low-cost, and low-noise. The clamping force is adjustable by controlling the stroke of the motor's motion unit, preventing leakage due to insufficient clamping.

[0018] The control circuit provided by this utility model has high safety and wide applicability; the maximum continuous drive current can reach 3.5A, and the operating voltage range includes 4.5V to 37V. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a block diagram of the pipe clamping control system.

[0021] Figure 2 This is a design diagram for the clamping control circuit.

[0022] Figure 3 This is a functional block diagram of the motor drive DRV8876 in Example 2. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of this utility model, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the protection scope of this utility model. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the scope of this utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0025] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0026] Example 1: like Figure 1 As shown, this is a preferred embodiment of the present invention, a tube clamping control system, including at least one tube clamping device, each tube clamping device including an MCU control unit, a motor drive unit, a motor action unit, a position detection unit and a dialysate pipeline unit; The motor drive unit and the position detection unit are electrically connected to the MCU control unit, respectively; The MCU control unit is used to transmit motor control signals to the motor drive unit; The motor drive unit is used to receive motor control signals to drive the movement of the motor motion unit. The motor drive unit is also used to monitor the current signal I of the motor motion unit. 阀 and the current signal I 阀 Feedback is sent to the MCU control unit; The position detection unit is used to detect the movement position of the motor motion unit and feed back the movement position trigger signal to the MCU control unit; the position detection unit includes a push rod switch, which includes a start switch and an end switch, and the movement position of the motor motion unit is determined by the trigger signal of the start switch or the end switch triggered by the motor motion unit.

[0027] The MCU control unit is based on the motion position trigger signal and the current signal I. 阀 This is used to control the tightening and loosening of the dialysate tubing unit by the motor drive unit.

[0028] Example 2: like Figures 2-3 As shown, this utility model also provides a tube clamping control circuit, which is used in conjunction with the tube clamping control system described above; it includes an MCU control unit, a motor drive unit, and a position detection unit; The motor drive unit includes a controller U14 (in this embodiment, the motor drive uses a DRV8876 controller), a drive module, a drive signal input module, and a current signal output module; the drive module includes a motor and a connector J18; the OUT1 and OUT2 ports of the controller U14 are connected to the motor through the connector J18; The controller U14 is connected to the MCU control unit via a drive signal input module for transmitting device start / stop or state switching commands; the current signal output module is connected to the MCU control unit for outputting current signal I. 阀 ; The position detection unit's switch signal ports MOTOR_START and MOTOR_END are connected to the MCU control unit. The MCU control unit communicates with the MCU control unit via switch signals and current signals I. 阀 Determine the clamp control status.

[0029] The driving module also includes ferrite bead FB7, ferrite bead FB8, capacitor C135, capacitor C140, capacitor C141, diode D1, and diode D2; The port OUT1 of the controller U14 is connected to the first end of the magnetic bead FB8. The second end of the magnetic bead FB8 is connected in sequence to the first end of the capacitor C141 and the diode D2, and is connected to the motor through the connector J18. The second ends of the capacitor C141 and the diode D2 are grounded. The port OUT2 of the controller U14 is connected to the first end of the magnetic bead FB7. The second end of the magnetic bead FB7 is connected in sequence to the first ends of capacitor C140, capacitor C135 and diode D1, and is connected to the motor through connector J18. The second ends of capacitor C140 and diode D1 are grounded, and the second end of capacitor C135 is connected between the first ends of capacitor C141 and diode D2.

[0030] The drive module is connected to the motor and outputs control signals to control the motor's forward and reverse rotation and speed.

[0031] The current signal output module includes resistors R121, R125, and R124, and capacitor C133; The port PMODE of the controller U14 is connected to the first end of the resistor R121, and the second end of the resistor R121 is connected to the power supply VCC-3V3. The IPROPI port of the controller U14 is connected to the first end of resistor R125. The second end of resistor R125 is connected to the first end of resistor R124. The second end of resistor R124 is connected to the first end of capacitor C133. The controller U14 is connected to the MCU control unit through the current signal output port MOTOR_CURRENT_ADC. The second end of capacitor C133 is grounded.

[0032] The current signal output module uses resistor R121 to select the controller mode, accept PWM signals, control the direction and speed of the motor, and perform current limiting protection to prevent overcurrent damage to the controller.

[0033] The IPROPI port outputs an analog voltage signal proportional to the motor current. The voltage value is read by the ADC, the actual motor current is calculated, and then the signal is output to the MCU control unit through the MOTOR_CURRENT_ADC current signal output port.

[0034] The drive signal input module includes resistors R122 and R123, connection port MOTOR_IN1 and connection port MOTOR_IN2; the ENIN1 port of controller U14 is connected to the connection port MOTOR_IN1 with resistor R123 in series, and the ENIN1 port of controller U14 is connected to the connection port MOTOR_IN2 with resistor R122 in series.

[0035] The motor drive unit also includes a power input module, which includes capacitor C131, resistor R118, capacitor C132, capacitor C134, capacitor C136, capacitor C137, capacitor C138 and capacitor C139. The capacitor C132 is connected between port CPL and port CPH of the controller U14; The VREF port of the controller U14 is connected to the first end of the resistor R118 and the capacitor C131 respectively. The second end of the resistor R118 is connected to the power supply VCC-3V3, and the second end of the capacitor C131 is grounded. The controller U14's port VCP is connected to the first end of capacitor C134, and the controller U14's port VM is connected to the second end of capacitor C134. The second end of capacitor C134 is connected in parallel with capacitors C136, C137, C138, and C139, and then connected to the power supply VCC-MOTOR. Capacitors C136, C137, C138, and C139 are all grounded.

[0036] By connecting multiple capacitors in parallel between port VCP and port VM, power filtering, energy storage, and transient response are achieved, ensuring stable motor operation, maintaining stable charge pump boost, optimizing drive efficiency, effectively suppressing noise, reducing failure rate, and extending device life.

[0037] The position detection unit includes connector J19, diode D36, diode D37, resistor R126, resistor R127, capacitor C142, and capacitor C143. The position detection unit is connected to the push switch via connector J19. The first and fourth ports of connector J19 are grounded. The second port of connector J19 is connected to the first end of diode D36, resistor R126 and capacitor C142 in sequence, and then connected to the switch signal port MOTOR_START. The second ends of diode D36 and capacitor C142 are grounded respectively, and the second end of resistor R126 is connected to power supply VCC-3V3. After the third port of connector J19 is connected to the first end of diode D37, resistor R127 and capacitor C143 in sequence, it is connected to the switch signal port MOTOR_END; the second ends of diode D37 and capacitor C143 are grounded respectively, and the second end of resistor R127 is connected to power supply VCC-3V3.

[0038] The position detection unit feeds back the detected push rod switch status information to the MCU control unit.

[0039] The motor drive unit also includes resistors R119 and R120; the port nFAULT of the controller U14 is connected to the first end of resistor R119, and the second end of resistor R119 is connected to power supply VCC-3V3; the port nSLEEP of the controller U14 is connected to the first end of resistor R120, and the second end of resistor R120 is connected to power supply VCC-3V3.

[0040] The above structure is used for real-time feedback of abnormal conditions in the drive system. When the chip detects a short circuit or special conditions such as over-temperature or over-current, resistor R119 is pulled low, automatically cutting off the circuit.

[0041] When resistor R120 is at a low level, it shuts down most of the internal circuitry of the chip, reducing static power consumption; when it is at a high level, the controller resumes normal operation and responds to the input control signals.

[0042] In actual operation, the input ports IN1, IN2 and MOTOR_CURRENT_ADC of the motor drive unit are connected to the I / O ports of the MCU control unit, while the switching signals MOTOR_START and MOTOR_END are connected to the MCU control unit; the output ports OUT1 and OUT2 of the motor drive unit are connected to the motor. The MCU control unit outputs PWM signals from its two I / O ports, which are then sent to the motor drive unit to control the motor's forward and reverse rotation and speed. The motor rotates forward, driving the motor action unit forward and triggering the end-point switch in the position detection unit. The MCU control unit receives a signal from the position detection unit indicating that the pipeline is about to clamp, as well as a current signal from the current signal output module. The motor continues to move forward, and the current I gradually increases. When the current reaches I... 阀1 The clamping process is complete; The motor reverses, causing the push rod to move backward, triggering the start switch in the position detection unit. The MCU control unit receives the pipeline release and clamping signal from the position detection unit and the current signal from the current signal output module. The motor continues to move backward, during which the current I gradually decreases. When the current reaches I... 阀2 Release the clamp when the tube is released.

[0043] When the motor is running, if a short circuit or special circumstances such as overheating or overcurrent occur in the power supply, the motor drive unit will automatically cut off the circuit.

[0044] Example 3: This utility model also relates to a peritoneal dialysis machine, including the tube clamping control system described in Example 1.

[0045] Example 4: This utility model also relates to a peritoneal dialysis machine, including the tube clamping control circuit described in Example 2.

[0046] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A pinch control system, characterized by, It includes at least one clamping device, and each clamping device includes an MCU control unit, a motor drive unit, a motor actuation unit, a position detection unit, and a dialysate tubing unit; The motor drive unit and the position detection unit are electrically connected to the MCU control unit, respectively; The MCU control unit is used to transmit motor control signals to the motor drive unit; The motor drive unit is configured to receive motor control signals to drive movement of the motor movement unit, and the motor drive unit is further configured to monitor a current signal I of the motor movement unit 阀 and feed back the current signal I 阀 to the MCU control unit. The position detection unit is used to detect the movement position of the motor motion unit and feed back the movement position trigger signal to the MCU control unit; The MCU control unit controls the motor drive unit to tighten and release the dialysate pipe unit according to the motion position trigger signal and the current signal I 阀 ​ 2. A clamp control system according to claim 1, wherein The position detection unit includes a push rod switch, which includes a start switch and an end switch. The movement position of the motor motion unit is determined by triggering the start switch or the end switch through the motor motion unit.

3. A tube clamping control circuit, used in the tube clamping control system according to any one of claims 1-2; characterized in that, Includes an MCU control unit, a motor drive unit, and a position detection unit; The motor drive unit includes a controller U14, a drive module, a drive signal input module, and a current signal output module; the drive module includes a motor and a connector J18; the OUT1 and OUT2 ports of the controller U14 are connected to the motor through the connector J18. The controller U14 is connected to the MCU control unit via a drive signal input module for transmitting device start / stop or state switching commands; the current signal output module is connected to the MCU control unit for outputting current signal I. 阀 ; The switch signal ports MOTOR_START and MOTOR_END of the position detection unit are connected with the MCU control unit, and the MCU control unit judges the switch signal and the current signal I 阀 Judge the pinch control state.

4. A pinch control circuit according to claim 3, wherein The driving module also includes ferrite bead FB7, ferrite bead FB8, capacitor C135, capacitor C140, capacitor C141, diode D1, and diode D2; The controller U14's port OUT1 is connected to the first end of the magnetic bead FB8, and the second end of the magnetic bead FB8 is connected in sequence to the first end of the capacitor C141 and the diode D2, and is connected to the motor through connector J18; the second ends of the capacitor C141 and the diode D2 are grounded. The port OUT2 of the controller U14 is connected to the first end of the magnetic bead FB7. The second end of the magnetic bead FB7 is connected in sequence to the first ends of capacitor C140, capacitor C135 and diode D1, and is connected to the motor through connector J18. The second ends of capacitor C140 and diode D1 are grounded, and the second end of capacitor C135 is connected between the first ends of capacitor C141 and diode D2.

5. A pinched tube control circuit according to claim 3, wherein The current signal output module includes resistors R121, R125, and R124, and capacitor C133; The port PMODE of the controller U14 is connected to the first end of the resistor R121, and the second end of the resistor R121 is connected to the power supply VCC-3V3. The IPROPI port of the controller U14 is connected to the first end of resistor R125. The second end of resistor R125 is connected to the first end of resistor R124. The second end of resistor R124 is connected to the first end of capacitor C133. The controller U14 is connected to the MCU control unit through the current signal output port MOTOR_CURRENT_ADC. The second end of capacitor C133 is grounded.

6. A pinched tube control circuit according to claim 3, wherein The drive signal input module includes resistors R122 and R123, connection port MOTOR_IN1 and connection port MOTOR_IN2; the ENIN1 port of controller U14 is connected to the connection port MOTOR_IN1 with resistor R123 in series, and the ENIN1 port of controller U14 is connected to the connection port MOTOR_IN2 with resistor R122 in series.

7. A pinched tube control circuit according to claim 3, wherein The motor drive unit also includes a power input module, which includes capacitor C131, resistor R118, capacitor C132, capacitor C134, capacitor C136, capacitor C137, capacitor C138 and capacitor C139. The capacitor C132 is connected between port CPL and port CPH of the controller U14; The VREF port of the controller U14 is connected to the first end of the resistor R118 and the capacitor C131 respectively. The second end of the resistor R118 is connected to the power supply VCC-3V3, and the second end of the capacitor C131 is grounded. The controller U14's port VCP is connected to the first end of capacitor C134, and the controller U14's port VM is connected to the second end of capacitor C134. The second end of capacitor C134 is connected in parallel with capacitors C136, C137, C138, and C139, and then connected to the power supply VCC-MOTOR. Capacitors C136, C137, C138, and C139 are all grounded.

8. A pinched tube control circuit according to claim 3, wherein The position detection unit includes connector J19, diode D36, diode D37, resistor R126, resistor R127, capacitor C142, and capacitor C143. The position detection unit is connected to the push switch via connector J19. The first and fourth ports of connector J19 are grounded. The second port of connector J19 is connected to the first end of diode D36, resistor R126 and capacitor C142 in sequence, and then connected to the switch signal port MOTOR_START. The second ends of diode D36 and capacitor C142 are grounded respectively, and the second end of resistor R126 is connected to power supply VCC-3V3. After the third port of connector J19 is connected to the first end of diode D37, resistor R127 and capacitor C143 in sequence, it is connected to the switch signal port MOTOR_END; the second ends of diode D37 and capacitor C143 are grounded respectively, and the second end of resistor R127 is connected to power supply VCC-3V3.

9. A peritoneal dialysis machine, characterized in that Includes the tube clamping control system as described in claim 1 or 2.

10. A peritoneal dialysis machine, characterized in that, Includes the clamping control circuit as described in any one of claims 3-8.

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