Internal arteriovenous fistula forearm blood flow limitation and equidistant exercise linkage combined control method and system

Abstract

The invention relates to the technical field of medical electronic equipment, in particular to an internal arteriovenous fistula forearm blood flow limitation and equidistant exercise linkage combined control method and system. Automatic linkage of grip exercise and forearm blood flow limitation is achieved through the complete process of power-on self-test, parameter setting, grip trigger judgment, inflation control, pressure adjustment, exercise maintenance and exhaust control; the corresponding system is composed of a main control module, a signal acquisition module, a pneumatic execution module and a man-machine interaction module, through cooperative work of all the modules, the problems that in the prior art, grip strength and arm binding strength cannot be quantified, operation is tedious, and safety protection is lacked are solved, a personalized exercise scheme can be made according to the requirements of a user, and the user experience is improved. The safety, convenience and effectiveness of internal fistula exercise are improved, and maturation of internal fistula is assisted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical electronic equipment, in particular to a control method and system for forearm blood flow restriction combined with isometric exercise linkage of arteriovenous fistula. BACKGROUND

[0002] Autologous arteriovenous fistula is the first choice for patients with maintenance hemodialysis, and the quality of arteriovenous fistula will directly affect the dialysis treatment, disease prognosis and quality of life of patients. Preoperative upper limb functional exercise can increase the success rate of surgery, and postoperative exercise can promote fistula maturation and reduce the occurrence of dysfunction. For example, isometric exercise (fist clenching) combined with blood flow restriction (achieved by arm binding) is an effective method to promote fistula maturation.

[0003] The current clinical method is for the patient to use a handgrip ball or a handgrip device for exercise, and at the same time, another person assists to bind the upper arm with a tourniquet to restrict blood flow. This method has significant drawbacks: first, the pressure of the bound arm is completely dependent on the operator's hand feeling, and cannot be quantified, and if the pressure is too small, the effect will be poor, and if the pressure is too large, it will easily cause limb numbness and even nerve damage; second, the start and stop of the exercise and the binding of the arm need to be manually operated, the process is cumbersome, and the exercise time needs to be counted separately, making it difficult to ensure the standardization and compliance of the exercise. At present, there are existing technologies that attempt to combine isometric exercise with forearm blood flow restriction, but they cannot achieve automatic linkage triggering of handgrip and arm binding, and the visualization and quantification of exercise parameters (handgrip value, arm binding pressure, duration) are low.

[0004] In summary, there is an urgent need for a control method and system for forearm blood flow restriction combined with isometric exercise linkage of arteriovenous fistula, which can achieve quantification and automatic control of arm binding pressure, exercise intensity and time. SUMMARY

[0005] To solve the above problems, the present application provides a control method and system for forearm blood flow restriction combined with isometric exercise linkage of arteriovenous fistula, which can achieve quantification and automatic control of arm binding pressure, exercise intensity and time.

[0006] The technical solution of the present application is: a control method for forearm blood flow restriction combined with isometric exercise linkage of arteriovenous fistula, comprising the following steps:

[0007] S0, power-on self-test: after the system is powered on, the signal acquisition module, pneumatic execution unit and timer are subjected to function self-test, and after the self-test is passed, the system enters standby state;

[0008] S1, parameter setting: receiving the target handgrip value, target cuff pressure value and single exercise duration set by the user;

[0009] S2, trigger judgment: continuously acquiring the handgrip signal and judging whether the current handgrip value reaches the target handgrip value;

[0010] S3, inflation control: when the current grip value reaches the target grip value, a pneumatic execution unit is controlled to start and inflate a pressurized sleeve 3;

[0011] S4, pressure regulation: continuously collect sleeve pressure signals, and dynamically adjust the working state of the pneumatic execution unit according to the difference between the target sleeve pressure value and the real-time pressure value, so that the real-time pressure value reaches and maintains the target sleeve pressure value;

[0012] S5, exercise maintenance: when the real-time pressure value reaches the target sleeve pressure value, a timer is started and enters the exercise phase, in which the pressure is continuously maintained stable;

[0013] S6, exhaust control: when the timer reaches the single exercise duration, the pneumatic execution unit is controlled to perform exhaust operation.

[0014] Preferably, in step S4, a closed-loop control algorithm is used to dynamically adjust the working state of the pneumatic execution module.

[0015] Preferably, the closed-loop control algorithm is a proportional-integral-derivative (PID) control algorithm.

[0016] An arteriovenous fistula forearm blood flow restriction combined with isometric exercise linkage control system for executing the method of any one of claims 1 to 4, comprising: a master control module; a signal acquisition module electrically connected to the master control module, for acquiring grip signal and sleeve pressure signal; a pneumatic execution module electrically connected to the master control module, for performing inflation and exhaust operation based on the instruction of the master control module; a human-computer interaction module electrically connected to the master control module, for parameter setting and information display; the master control module is configured to execute the control method as claimed in any one of claims 1 to 4.

[0017] Preferably, the signal acquisition module comprises: a grip signal conditioning circuit, the input end of which is connected to a grip sensor 1, and the output end is connected to the master control module, for amplifying and filtering the collected grip analog signal; a pressure signal acquisition circuit, the input end of which is connected to a pressure sensor, and the output end is connected to the master control module, for transmitting the pressure signal to the master control module.

[0018] Preferably, the grip signal conditioning circuit comprises an amplification chip, the input end of which is connected to the grip sensor 1, and the output end is connected to the master control module pin.

[0019] Preferably, the pneumatic execution module comprises: a gas pump driving circuit, the control end of which is connected to the master control module, and the controlled end of which is connected to a gas pump; and an electromagnetic valve driving circuit, the control end of which is connected to the master control module, and the controlled end of which is connected to at least one electromagnetic valve.

[0020] Preferably, the gas pump driving circuit and the electromagnetic valve driving circuit each comprise an isolation element and a switching element.

[0021] Preferably, the isolation element is an optical coupling isolator, and the switching element is a metal-oxide semiconductor field effect transistor.

[0022] The present application has the following beneficial effects:

[0023] 1. The present application sets target grip strength value, target cuff pressure value and other parameters, and combines the display function of the human-computer interaction module, so that key parameters such as grip strength, arm cuff pressure and exercise duration can be quantified and visualized, and the user can clearly grasp the exercise state, thereby solving the problem of fuzzy parameters in the prior art, facilitating the development of personalized exercise programs according to the user's internal fistula condition, and promoting the maturation of the internal fistula.

[0024] 2. The present application realizes the full-process automation linkage of "grip strength triggering-automatic inflation-pressure maintaining timing-automatic exhaust", without manual intervention, and is simple to operate, thereby significantly improving the exercise compliance of the patient.

[0025] 3. The grip strength exercise is linked with the forearm blood flow restriction, the cuff inflation is started only after the grip strength reaches the standard, and the grip strength is required to be kept stable during the exercise process, so as to ensure that the two are performed synchronously, thereby improving the pertinence and effectiveness of the internal fistula exercise and accelerating the maturation speed of the internal fistula.

[0026] 4. The power-on self-checking function of the system of the present application can discover module faults in advance, avoids the harm to the user caused by exercise in a fault state, and comprehensively guarantees the safety of the user. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a control method flowchart of the present application;

[0028] Figure 2 is a system structure block diagram of the present application;

[0029] Figure 3 is an interface of the master control chip of the present application;

[0030] Figure 4 is an interface of the grip strength sensor 1 of the present application;

[0031] Figure 5 is an amplification module of the grip strength sensor 1 of the present application;

[0032] Figure 6 is an interface of the gas pressure sensor of the present application;

[0033] Figure 7 is the intake electromagnetic valve circuit of the application;

[0034] Figure 8 is the exhaust electromagnetic valve circuit of the application;

[0035] Figure 9 is the structural schematic diagram of the application.

[0036] Explanation of reference signs:

[0037] 1-main box, 2-grip sensor, 3-pressurized cuff. DETAILED DESCRIPTION

[0038] The embodiments of the application will be further described below with reference to the accompanying drawings.

[0039] Example 1:

[0040] As shown in the figure, a forearm blood flow restriction combined with equidistance exercise linkage control method for arteriovenous fistula, comprising the following steps: Figure 1

[0041] S0, power-on self-test: after the system is powered on, the signal acquisition module, pneumatic execution unit and timer are functionally self-tested, and after the self-test is passed, the standby state is entered; wherein the signal acquisition module detects whether the grip sensor 1 can normally output an analog signal and whether the air pressure sensor can normally feedback a pressure signal, and simultaneously checks whether the signal amplification and filtering functions of the grip signal conditioning circuit and the pressure signal acquisition circuit are normal;

[0042] The pneumatic execution module controls the short-term start of the air pump, the alternate opening and closing of the intake electromagnetic valve and the exhaust electromagnetic valve, detects whether the air pump speed is normal and whether the electromagnetic valve is smooth, and ensures that the inflation and exhaust functions are fault-free;

[0043] The timer triggers the timing function to detect whether the timing accuracy meets the requirements (error ≤1s).

[0044] After the self-test is passed, the system enters the standby state, and the man-machine interaction module displays the "standby-please set parameters" prompt.

[0045] S1, parameter setting: receiving the target grip value, target cuff pressure value and single exercise duration set by the user; the user inputs the exercise parameters through the key unit (up and down adjustment keys, confirmation key) of the man-machine interaction module, specifically including:

[0046] Target grip value: set according to the time of fistula establishment and patient tolerance, such as 5-10N for 1 week after fistula establishment, 10-15N for 2-4 weeks;

[0047] ​Target cuff pressure value: Set based on the recommended clinical forearm blood flow restriction pressure range, usually 80-120mmHg, to avoid excessive pressure leading to limb numbness and other discomfort;

[0048] Single exercise duration: Set according to clinical standards, usually 20-40s, to ensure that the blood flow restriction time is within a safe range and to avoid long-term blockage of blood flow, which increases the risk of blood vessel occlusion.

[0049] After setting the parameters, the display unit of the human-computer interaction module displays the set parameters in real time for the user to confirm. After confirmation, it enters the grip trigger waiting state.

[0050] S2, trigger judgment: continuously collect grip signals and judge whether the current grip value reaches the target grip value; the grip sensor 1 in the signal collection module continuously collects the analog signal of the user's palm grip, which is transmitted to the grip signal conditioning circuit, and after amplification and filtering processing, it is converted into a digital signal and transmitted to the main control module. The main control module compares the real-time grip value with the target grip value set by the user, and judges whether the real-time grip value reaches the target grip value: if not, continue to wait and display the current grip value in real time; if it reaches the target grip value, enter the inflation control step.

[0051] S3, inflation control: when the current grip value reaches the target grip value, control the pneumatic execution unit to start and inflate the pressurized cuff 3; when the real-time grip value reaches the target grip value, the main control module sends an inflation instruction to the pneumatic execution module: control the inflation pump to start and begin to output compressed air; control the air inlet solenoid valve to open, and the compressed air enters the pressurized cuff 3 through the air inlet solenoid valve (the pressurized cuff 3 is pre-wrapped around the patient's forearm and upper arm, and the tightness is appropriate to fit the skin without compression); At this time, the user needs to keep the grip stable around the target grip value to ensure that the grip exercise and blood flow restriction are started synchronously.

[0052] S4, pressure regulation: continuously collect cuff pressure signals and dynamically adjust the working state of the pneumatic execution unit according to the difference between the target cuff pressure value and the real-time pressure value, so that the real-time pressure value reaches and maintains the target cuff pressure value; The pressure sensor continuously collects the pressure signal in the pressurized cuff 3, which is transmitted to the main control module through the pressure signal collection circuit. The main control module dynamically adjusts the working state of the pneumatic execution unit according to the difference between the target cuff pressure value and the real-time pressure value through a closed-loop control algorithm:

[0053] If the real-time pressure value < target cuff pressure value: control the inflation pump to keep high-speed operation and the air inlet solenoid valve to be fully open to speed up the inflation speed;

[0054] If the real-time pressure value is close to the target cuff pressure value (generally, the difference is less than or equal to 5 mmHg): reduce the rotation speed of the inflation pump and the opening degree of the air inlet electromagnetic valve, and slowly inflate;

[0055] If the real-time pressure value reaches the target cuff pressure value: control the inflation pump to stop running and the air inlet electromagnetic valve to close, and enter the pressure maintaining state.

[0056] Through the above adjustment, the real-time cuff pressure value is ensured to be stably maintained at the target cuff pressure value, with a fluctuation range of less than or equal to ± 2 mmHg, so as to ensure the stability of the blood flow restriction effect. The closed-loop control algorithm is preferably a proportional-integral-derivative (PID) control algorithm, and by setting reasonable proportional coefficient (5-10), integral coefficient (0.1-0.5) and derivative coefficient (0.01-0.1), the pressure regulation can be quickly responded (the time for reaching the target pressure from 0 is less than or equal to 3 s) and without overshoot, so as to avoid the damage to blood vessels caused by sudden pressure rise.

[0057] S5, exercise maintenance: when the real-time pressure value reaches the target cuff pressure value, a timer is started and the exercise phase is entered, in which the pressure is continuously maintained stable; after the real-time cuff pressure value reaches the target cuff pressure value, the main control module automatically starts the timer, and the system enters the exercise phase:

[0058] The timer starts to count down, and the real-time remaining time is displayed on the human-computer interaction module;

[0059] The signal acquisition module continuously acquires the grip signal and the cuff pressure signal: if the cuff pressure slightly decreases (the difference is greater than 2 mmHg) due to leakage, the main control module controls the inflation pump to be temporarily started and the air inlet electromagnetic valve to be slightly opened, so as to supplement the pressure to the target value and maintain the pressure stable;

[0060] In this phase, the user needs to maintain the grip and the pressure stable, complete the synergistic effect of the isometric exercise and the blood flow restriction, and promote the dilation of the internal fistula blood vessels.

[0061] S6, exhaust control: when the timer reaches the single exercise time length, the pneumatic execution unit is controlled to perform the exhaust operation. When the timer displays the time reaching the single exercise time length, the main control module sends an exhaust instruction to the pneumatic execution unit:

[0062] The exhaust electromagnetic valve is controlled to be opened, and the compressed air in the cuff is discharged through the exhaust electromagnetic valve;

[0063] The air pressure sensor monitors the cuff pressure in real time, and when the pressure decreases to close to the atmospheric pressure (the residual pressure is less than or equal to 10 mmHg), the exhaust electromagnetic valve is controlled to be closed, and one exercise cycle is completed;

[0064] Further, the application can also set safety thresholds in step S4 (pressure regulation) and step S5 (exercise maintenance), which are monitored by the master control module, such as a pressure safety threshold set at 120% of the target cuff pressure value (e.g. 120 mmHg when the target pressure is 100 mmHg); a grip safety threshold set at 150% of the target grip value (e.g. 15 N when the target grip is 10 N).

[0065] If the real-time pressure value exceeds the pressure safety threshold or the real-time grip value exceeds the grip safety threshold, the master control module immediately interrupts the current process, controls the inflation pump to stop, the air inlet solenoid valve to close, and the air outlet solenoid valve to fully open, forces rapid air exhaust, and triggers an audible and light alarm signal (continuous buzzing of the buzzer and flashing of the red light on the display unit) until the pressure drops to a safe range, thereby avoiding causing limb numbness and other discomfort.

[0066] To implement the above control method, the application also provides an arteriovenous fistula forearm blood flow restriction combined with isometric exercise linkage control system, which comprises:

[0067] A master control module, as the core control unit of the system, adopts a microcontroller with multiple I / O pins and supporting PID algorithm, and its functions include:

[0068] The master control module receives the grip and pressure digital signals transmitted by the signal acquisition module, processes the data, and makes logical judgments.

[0069] The master control module sends control instructions for inflation, exhaust, and pressure maintenance to the pneumatic execution module.

[0070] The master control module controls the human-computer interaction module to realize parameter display and key instruction reception.

[0071] The master control module triggers self-checking process and safety alarm mechanism.

[0072] The master control module stores exercise parameters and historical data (such as single duration and total exercise times).

[0073] The master control module is electrically connected to other modules through pins, such as the pin connected to the grip signal conditioning circuit for receiving the processed grip signal and the pin connected to the air pump driving circuit for outputting the air pump control signal.

[0074] A signal acquisition module is electrically connected to the master control module and is used to acquire grip signals and cuff pressure signals, and comprises a grip signal conditioning circuit and a pressure signal acquisition circuit.

[0075] The grip signal conditioning circuit: the input end is connected to a dedicated interface (such as an analog-to-digital converter) for receiving the grip signal. Figure 3As shown, the MX 128-2.54-05P-GN01-Cu-Y-A interface in the figure is connected with the grip strength sensor 1, and the output end is connected with the master control module; the built-in amplification chip in the circuit (such as the HX711 chip in the figure) amplifies the weak analog signal (usually mV level) output by the grip strength sensor 1 to a V level signal recognizable by the master control module, and removes environmental interference through a filter capacitor to ensure signal stability;

[0076] The pressure signal acquisition circuit: the input end is connected with the air pressure sensor, and the output end is connected with the master control module; the air pressure sensor directly acquires the pressure signal in the cuff, converts it into an electric signal, and then transmits it to the master control module through the circuit after conversion, without additional amplification (the output signal of the air pressure sensor is already V level), and only simple filtering processing is needed to ensure real-time and accurate pressure signals.

[0077] The pneumatic execution module is electrically connected with the master control module, and is used for executing inflation and deflation operations based on the instructions of the master control module, and includes a gas pump driving circuit, an electromagnetic valve driving circuit, an inflation pump, an air inlet electromagnetic valve, and an air outlet electromagnetic valve, and the specific structure is as follows:

[0078] The gas pump driving circuit: the control end is connected with the master control module, and the controlled end is connected with the inflation pump; the circuit includes an isolation element (optocoupler isolator) and a switching element (metal-oxide semiconductor field effect transistor), the optocoupler isolator realizes electrical isolation between the master control module and the gas pump, avoiding the large current of the gas pump from interfering with the master control module when the gas pump is working, and the transistor is used to control the on-off and rotation speed of the gas pump;

[0079] The electromagnetic valve driving circuit: the control end is connected with the master control module, and the controlled end is connected with the air inlet electromagnetic valve and the air outlet electromagnetic valve respectively; the circuit also includes an optocoupler isolator and a metal-oxide semiconductor field effect transistor, the optocoupler isolator isolates the reverse electromotive force of the electromagnetic valve coil, and the metal-oxide semiconductor field effect transistor controls the on-off of the electromagnetic valve; the air inlet electromagnetic valve is used to control the switch of the inflation passage, and the air outlet electromagnetic valve is used to control the switch of the exhaust passage;

[0080] The inflation pump: a miniature DC gas pump is adopted, and a suitable displacement (usually 1-3 L / min) is selected according to the volume of the cuff, so as to ensure that the cuff pressure can be raised from 0 to the target value within 3s;

[0081] The pressurized cuff 3: made of elastic material, provided with an air pressure sensor mounting position inside, and fixed after being wrapped around the arm by a magic tape, so as to ensure that the cuff is attached to the upper arm after inflation and there is no air leakage.

[0082] The man-machine interaction module is electrically connected with the master control module, and is used for parameter setting and information display, and is used to realize the interaction between the user and the system, and includes a display unit and a key unit.

[0083] The display unit: adopts a liquid crystal display screen, and can display information in real time;

[0084] Button unit: It contains 3 buttons, namely the confirmation button (used to confirm parameter settings, pause / continue exercise), the up adjustment button (increase parameter value), and the down adjustment button (decrease parameter value). The buttons are connected to the main control module through the interface. When pressed, they send the corresponding level signal to the main control module to trigger parameter adjustment or function switching.

[0085] As shown in the figure, pins G03 and G04 of the main control module are connected to the output of the grip force signal conditioning circuit to receive the processed grip force signal; pin G01 is connected to the output of the pressure signal acquisition circuit to receive the pressure signal; pin G12 is connected to the air pump drive circuit to output the air pump control signal; pins G11 and G10 are connected to the intake solenoid valve and exhaust solenoid valve drive circuits respectively to output the solenoid valve control signal; pins G42, G38, and G39 are connected to the confirmation key, the up adjustment key, and the down adjustment key respectively to receive key commands; and pins are connected to the display unit to output the display signal.

[0086] The grip force sensor can be a strain gauge grip force sensor 1, with an MX128-2.54-05P-GN01-Cu-YA interface connected to the grip force signal conditioning circuit. The grip force signal conditioning circuit uses an HX711 amplifier chip, with pins 7 and 8 of the chip connected to pins 3 and 4 of the grip force sensor 1 interface to receive the raw analog signal, and pins 11 and 12 connected to pins G03 and G04 of the main control module to output the processed digital signal. A 10kΩ current-limiting resistor (R1) is connected in series and a 100nF filter capacitor (C1) is connected in parallel in the circuit to ensure signal stability.

[0087] The air pressure sensor can be a miniature pressure sensor, which is connected to the pressure signal acquisition circuit through a 2.54-1*4P female interface. The circuit directly transmits the pressure signal output by the sensor to pin G01 of the main control module without additional amplification.

[0088] Air pump drive circuit: A TLP521-1 type optocoupler isolator (U3) and an AO3400A type MOSFET (Q1) are used. The input terminal of the optocoupler is connected to pin G12 of the main control module, and the output terminal is connected to the gate of the MOSFET. The drain of the MOSFET is connected to the air pump (miniature DC air pump, 12V power supply), and the source is grounded. A 100Ω current-limiting resistor (R2) is connected in series and a 10kΩ pull-down resistor (R3) is connected in parallel in the circuit to avoid false triggering of the metal-oxide-semiconductor field-effect transistor.

[0089] The electromagnetic valve driving circuit: the driving circuit structure of the air inlet electromagnetic valve and the exhaust electromagnetic valve is same, both adopt TLP521-1 type optical coupler isolator, AO3400A type MOSFET, and parallel SS34-MS type freewheeling diode (D1) simultaneously, prevent the reverse electromotive force generated when the electromagnetic valve coil is powered off from damaging the element; the air inlet electromagnetic valve driving circuit is connected with the main control module pin G11, and the exhaust electromagnetic valve driving circuit is connected with the pin G10;

[0090] The pressurized sleeve belt 3: adopt the elastic nylon material, the inside sews the air pressure sensor installation bag, the sleeve belt one end is equipped with the magic paste, winds the upper arm after fixed, ensures that there is no air leakage after inflation.

[0091] The display unit: select the liquid crystal display screen, through the interface connection main control module, can display 2 rows × 8 columns characters, real-time display parameter and exercise data;

[0092] The key unit: adopt 3 light touch keys, are respectively as the confirmation key, the up adjustment key, the down adjustment key, through the key interface connection main control module pin G42, G38, G39, presses the low level signal when, triggers parameter adjustment.

[0093] The above-mentioned embodiments only express the specific implementation ways of the present application, and the description is more specific and detailed, but it can not be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A method for controlling the forearm blood flow restriction combined with isometric exercise linkage of an arteriovenous fistula, characterized in that, The method comprises the following steps: S0, power-on self-test: after the system is powered on, the signal acquisition module, the pneumatic execution unit, and the timer are subjected to function self-test, and after the self-test is passed, the system enters a standby state; S1, parameter setting: receiving a target grip strength value, a target cuff pressure value, and a single exercise duration set by a user; S2, trigger judgment: continuously acquiring a grip strength signal and judging whether a current grip strength value reaches the target grip strength value; S3, inflation control: when the current grip strength value reaches the target grip strength value, controlling a pneumatic execution unit to start and inflate a pressurized cuff 3; S4, pressure regulation: continuously acquiring a cuff pressure signal and dynamically adjusting a working state of the pneumatic execution unit according to a difference between the target cuff pressure value and a real-time pressure value, so that the real-time pressure value reaches and maintains at the target cuff pressure value; S5, exercise maintenance: when the real-time pressure value reaches the target cuff pressure value, starting a timer and entering an exercise stage, and in this stage, the pressure is continuously maintained stable; S6, exhaust control: when the timer reaches the single exercise duration, controlling the pneumatic execution unit to perform an exhaust operation.

2. The forearm blood flow restriction cuff linkage control method of claim 1, wherein, In the step S4, a closed-loop control algorithm is used to dynamically adjust the working state of the pneumatic execution module.

3. The forearm blood flow restriction cuff linkage control method of claim 2, wherein, The closed-loop control algorithm is a proportional-integral-derivative (PID) control algorithm.

4. An arteriovenous fistula forearm blood flow restriction combined isometric exercise linkage control system for performing the method of any one of claims 1-3, wherein, The system comprises: a main control module; a signal acquisition module electrically connected with the main control module, used for acquiring a grip strength signal and a cuff pressure signal; a pneumatic execution module electrically connected with the main control module, used for performing inflation and exhaust operations based on instructions of the main control module; a human-computer interaction module electrically connected with the main control module, used for parameter setting and information display; the main control module is configured to execute the control method in any one of claims 1 to 4.

5. The AV fistula forearm blood flow restriction exercise linkage control system of claim 4, wherein, The signal acquisition module comprises: a grip strength signal conditioning circuit, an input end of which is used for connecting a grip strength sensor 1, and an output end of which is connected with the main control module, used for amplifying and filtering a collected grip strength analog signal; a pressure signal acquisition circuit, an input end of which is used for connecting an air pressure sensor, and an output end of which is connected with the main control module, used for transmitting an air pressure signal to the main control module.

6. The AV fistula forearm blood flow restriction exercise linkage control system of claim 5, wherein, The grip strength signal conditioning circuit comprises an amplification chip, an input end of which is connected with the grip strength sensor 1, and an output end of which is connected with a pin of the main control module.

7. The AV fistula forearm blood flow restriction exercise linkage control system of claim 6, wherein, The pneumatic execution module comprises: a gas pump driving circuit, a control end of which is connected with the main control module, and a controlled end of which is connected with a gas pump; an electromagnetic valve driving circuit, a control end of which is connected with the main control module, and a controlled end of which is connected with at least one electromagnetic valve.

8. The AV fistula forearm blood flow restriction exercise linkage control system of claim 7, wherein, Both the gas pump driving circuit and the electromagnetic valve driving circuit comprise an isolation element and a switching element.

9. The AV fistula forearm blood flow restriction exercise linkage control system of claim 8, wherein, The isolation element is an optical coupling isolator, and the switching element is a metal-oxide semiconductor field effect transistor.

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