Air bag type external counterpulsation system

Abstract

The air bag type external counterpulsation system is fast in response, high in stability and low in cost, a permanent magnet brushless motor air compressor is connected with an air storage tank and inputs compressed air into the air storage tank, the air storage tank is communicated with an air bag assembly through an air pipe, and an electromagnetic valve set is arranged on the air pipe; the main control circuit board controls the electromagnetic valve group to turn off or turn on the air pipe so as to control the air bag assembly to inflate and deflate; the pressure sensing unit monitors the internal pressure of the air storage tank and the air bag assembly in real time and transmits monitored pressure signals to the main control circuit board, and the main control circuit board adjusts the rotating speed of the permanent magnet brushless motor air compressor in real time according to the difference value between the actual pressure and the predicted pressure. The external counterpulsation system adopts a direct-current brushless motor, the voltage is reduced to 48V, a frequency converter is not needed, a harmonic filter and an isolation transformer are omitted, and the system cost is reduced; meanwhile, the rotating speed of the motor and the pressure of the air storage tank can be responded and controlled more quickly, and the stability and reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, concretely relates to a gasbag type external counterpulsation system. BACKGROUND

[0002] External counterpulsation is a kind of method by extracorporeal non-invasive compression lower half of body, reduces and eliminates angina pectoris symptom, improves the anoxia ischemic state of important organs of organism, it is also a kind of medical equipment for preventing and treating cardiovascular and cerebrovascular diseases simultaneously.The traditional external counterpulsation device is inflated and pressurized to gasbag wrapped in limbs and hip in diastolic phase, promotes the blood return of limb artery, vein to heart, makes diastolic pressure significantly increase, improves the blood perfusion of heart, brain and other important organs, reduces the cardiac afterload;Gasbag is rapidly exhausted in systolic phase, and pressure is removed, promotes the systolic pressure drop in aorta, maximumly reduces the resistance of cardiac ejection period, and blood accelerates to flow to distal end, to achieve counterpulsation effect.

[0003] The traditional external counterpulsation device three-phase asynchronous motor driven air compressor, the speed of three-phase asynchronous motor is controlled by frequency converter to realize the adjustment of treatment pressure.But frequency converter is the main harmonic pollution source of active equipment, therefore, still needs harmonic filter and isolation transformer to isolate and protect, causes high cost.The motor driven by frequency converter can only change the frequency of motor power to regulate speed, and the control precision of motor is low.In addition, three-phase asynchronous motor can only be driven by AC 220V power supply, in order to ensure safety performance, the EMC and safety design requirements of circuit are higher. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a gasbag type external counterpulsation system with fast response, high stability and low cost.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme as follows: a gasbag type external counterpulsation system, comprising:

[0006] Permanent magnet brushless motor air compressor, permanent magnet brushless motor air compressor is connected with gas storage tank and inputs compressed gas to gas storage tank, and gas storage tank is communicated with gasbag assembly through air pipe, and electromagnetic valve group is arranged on the air pipe;

[0007] Main control circuit board, main control circuit board controls electromagnetic valve group to shut off or open air pipe to control gasbag assembly to inflate and deflate;

[0008] Pressure sensing unit, the pressure inside gas storage tank and gasbag assembly is monitored in real time, and the monitored pressure signal is transmitted to main control circuit board, and main control circuit board adjusts the speed of permanent magnet brushless motor air compressor in real time according to the difference between actual pressure and predicted pressure.

[0009] The permanent magnet brushless motor air compressor comprises a brushless motor controller, and a main control circuit board is adjusted through the brushless motor controller.

[0010] The pressure sensing unit comprises a gas tank pressure sensor for collecting the pressure in the inner cavity of the gas tank and an air bag pressure sensor for collecting the pressure in the inner cavity of the air bag assembly.

[0011] The gas tank pressure sensor and the air bag pressure sensor are arranged on the main control circuit board and are communicated with the inner cavities of the gas tank and the air bag assembly through pressure collection pipes respectively.

[0012] The air bag assembly comprises a plurality of air bag units acting on different body parts, a plurality of groups of electromagnetic valve groups are arranged in correspondence with the number of air bag units of the air bag assembly, and each group of electromagnetic valve groups comprises two electromagnetic valves, and the two electromagnetic valves are electrically connected to the main control circuit board to control the inflation and deflation of the corresponding air bag unit.

[0013] The above scheme has at least the following advantages:

[0014] 1. The permanent magnet brushless motor air compressor is used as a driver, has wider power supply applicability, and can select a low-voltage 48V direct-current power supply.

[0015] 2. The direct-current power supply is driven, no frequency converter is needed, no harmonic pollution source, the interference of the collected signal quality is reduced, and the stability of the system is improved.

[0016] 3. Since the frequency converter is not needed, the harmonic filter and the isolation transformer are also saved, and the system cost is reduced.

[0017] 4. The motor speed and the pressure of the gas tank can be more quickly responded and controlled, and the stability and reliability of the system are improved.

[0018] 5. Direct monitoring of the pressures in the inner cavities of the gas tank and the air bag assembly can more accurately understand the current treatment state and provide a better treatment scheme for the patient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of an extracorporeal counterpulsation system. DETAILED DESCRIPTION

[0020] The following drawings further illustrate the working principle and advantages of the air bag type extracorporeal counterpulsation system.

[0021] As shown in the drawings, Figure 1 An air bag type extracorporeal counterpulsation system comprises:

[0022] Permanent magnet brushless motor air compressor 10, permanent magnet brushless motor air compressor 10 is connected with air tank 30 and inputs compressed gas to air tank 30, air tank 30 is communicated with air bag assembly 40 through air pipe and the air pipe is provided with electromagnetic valve group 50;

[0023] Master control circuit board 20, master control circuit board 20 controls electromagnetic valve group 50 to shut off or conduct air pipe to control air bag assembly 40 to charge, discharge gas;

[0024] Pressure sensing unit 60, the pressure inside air tank 30 and air bag assembly 40 is monitored in real time, and the monitored pressure signal is transmitted to master control circuit board 20, and master control circuit board 20 adjusts the speed of permanent magnet brushless motor air compressor 10 in real time according to the difference between actual pressure and predicted pressure.

[0025] Preferably, the permanent magnet brushless motor air compressor 10 includes a brushless motor controller 11, and the master control circuit board 20 adjusts through the brushless motor controller 11.

[0026] The working principle of the air bag type external counterpulsation system in the utility model is as follows: the master control circuit board 20 sends instructions to the brushless motor controller 11 to drive the permanent magnet brushless motor air compressor 10 to act, the permanent magnet brushless motor air compressor 10 inputs compressed gas into the air tank 30, the master control circuit board 20 sends opening and closing instructions to the electromagnetic valve group 50, so that the compressed gas in the air tank 30 can controllably release the air bag assembly 40, and the air bag assembly 40 regularly squeezes the patient's limbs in the process of charging and discharging, so that the treatment effect of external counterpulsation is realized. During treatment, the pressure sensing unit 60 monitors the pressure inside the air tank 30 and the air bag assembly 40 in real time, the master control circuit board 20 judges the difference between the actual pressure and the expected pressure through the monitored pressure signal, adjusts the brushless motor controller 11, controls the speed of the brushless motor, and makes the actual pressure controllably and in real time to the expected pressure.

[0027] Compared with the conventional external counterpulsation system, the external counterpulsation system using the brushless motor air compressor in the utility model has at least the following beneficial effects:

[0028] 1. Compared with the air compressor driven by the three-phase asynchronous motor of the conventional external counterpulsation device, the brushless motor air compressor 10 has wider power supply applicability, and low-voltage direct-current power supply can be selected, while the three-phase asynchronous motor of the conventional external counterpulsation device can only be driven by alternating-current 220V power supply.

[0029] 2. The brushless motor air compressor 10 can be powered by a low-voltage DC power supply, directly using the output of a switching power supply that has passed EMC (electromagnetic compatibility) and safety regulations. This reduces safety protection requirements and eliminates the need for additional EMC and safety circuit design. Traditional EECP compressors are driven by a three-phase asynchronous motor, which can only adjust treatment pressure by controlling the motor's speed through a frequency converter. Frequency converters are a major source of harmonic pollution in active devices. The brushless motor air compressor 10 is powered directly by the output of a switching power supply that has passed EMC and safety regulations. Compared to traditional EECP AC power supply, this effectively reduces AC interference with the signal quality of the EECP signal acquisition component, improving system stability.

[0030] 3. The original motor drive voltage was 220V, requiring a separate frequency converter to adjust the speed, as well as a harmonic filter and isolation transformer for isolation and protection. The EVCP system of the present invention, however, uses a brushless DC motor with a voltage reduced to 48V. This eliminates the need for a frequency converter, harmonic filter, and isolation transformer, and allows for faster response and control of the motor speed and the pressure in the gas tank 30 through the driver.

[0031] 4. The brushless motor air compressor 10 controls its speed through a brushless motor controller. Compared with a three-phase asynchronous motor controlled by a frequency converter, it has a faster and more stable response and can more quickly achieve the desired treatment pressure.

[0032] 5. Brushless motor drives offer many advantages. For example, a motor driven by an inverter can only adjust its speed by changing the frequency of the motor power supply, and cannot determine the current motor speed. However, a brushless motor can determine the motor's status, speed, torque, current, voltage, torque, etc. in real time.

[0033] As a preferred embodiment of the present invention, the pressure sensing unit 60 includes a gas tank pressure sensor 61 for collecting the pressure in the inner cavity of the gas tank 30 and an airbag pressure sensor 62 for collecting the pressure in the inner cavity of the airbag assembly 40. The pressures inside the gas tank 30 and the airbag assembly 40 are different. By respectively setting the gas tank pressure sensor 61 and the airbag pressure sensor 62, the pressures inside the gas tank 30 and the airbag assembly 40 can be accurately measured. The pressure changes in the gas tank 30 can be used to determine the exhaust efficiency of the system, such as controlling the power of the permanent magnet brushless motor air compressor 10 according to the pressure fluctuations in the gas tank 30. The real-time pressure of the airbag assembly 40 can be used to determine the relationship between pressure and treatment effect, thereby adjusting a more appropriate treatment pressure. The pressure difference between the gas tank 30 and the airbag assembly 40 also plays an important and positive role in the evaluation of the safety and stability of the system.

[0034] Further, the gas tank pressure sensor 61 and the air bag pressure sensor 62 are both arranged on the main control circuit board 20 and communicate with the inner cavities of the gas storage tank 30 and the air bag assembly 40 through pressure collection pipes respectively. The pressure in the inner cavities of the gas storage tank 30 and the air bag assembly 40 is collected directly by the pressure collection pipes, that is, the pressure in the inner cavities of the gas storage tank 30 and the air bag assembly 40 is directly monitored, so that the current treatment state can be known more accurately and a better treatment scheme can be provided for the patient; meanwhile, the pressure sensors are arranged externally and are not affected by the temperature, airflow impact and vibration in the inner cavities of the gas storage tank 30 and the air bag assembly 40, so that the measurement accuracy of the pressure sensors is higher.

[0035] The air bag assembly 40 comprises a plurality of air bag units acting on different body parts, the electromagnetic valve group 50 is provided with a plurality of groups corresponding to the number of air bag units of the air bag assembly 40, and each group of electromagnetic valve groups 50 comprises two electromagnetic valves, and the two electromagnetic valves are electrically connected to the main control circuit board 20 to control the inflation and deflation of the corresponding air bag units. Each air bag unit can be controlled independently, and the air bag units will not affect each other, and each side of the thigh and the hip can be operated in real time independently, energy is saved, and different pressures can be applied according to the severity of the disease of different parts to ensure the best treatment effect.

[0036] The basic principle, main features and characteristics of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. An airbag-type external counterpulsation system, characterized in that: include: A permanent magnet brushless motor air compressor (10), the permanent magnet brushless motor air compressor (10) is connected to an air tank (30) and inputs compressed gas into the air tank (30), the air tank (30) is connected to an air bag assembly (40) through an air pipe, and the air pipe is provided with a solenoid valve group (50); A main control circuit board (20), the main control circuit board (20) controls the electromagnetic valve group (50) to close or open the air pipe to control the inflation and deflation of the airbag assembly (40); The pressure sensing unit (60) monitors the internal pressure of the air storage tank (30) and the air bag assembly (40) in real time, and transmits the monitored pressure signal to the main control circuit board (20). The main control circuit board (20) adjusts the speed of the permanent magnet brushless motor air compressor (10) in real time according to the difference between the actual pressure and the predicted pressure.

2. The airbag-type external counterpulsation system according to claim 1, characterized in that: The permanent magnet brushless motor air compressor (10) comprises a brushless motor controller (11), and the main control circuit board (20) is regulated by the brushless motor controller (11).

3. The airbag-type external counterpulsation system according to claim 1, characterized in that: The pressure sensing unit (60) comprises a gas tank pressure sensor (61) for collecting the pressure in the inner cavity of the gas storage tank (30) and an air bag pressure sensor (62) for collecting the pressure in the inner cavity of the air bag assembly (40).

4. The airbag-type external counterpulsation system according to claim 3, characterized in that: The gas tank pressure sensor (61) and the airbag pressure sensor (62) are both arranged on the main control circuit board (20) and are respectively connected to the inner cavity of the gas storage tank (30) and the airbag assembly (40) through the pressure collection tube.

5. The airbag-type external counterpulsation system according to claim 1, characterized in that: The airbag assembly (40) includes a plurality of airbag units acting on different body parts, and a plurality of solenoid valve groups (50) are provided corresponding to the number of airbag units in the airbag assembly (40), and each solenoid valve group (50) includes two solenoid valves, and the two solenoid valves are electrically connected to the main control circuit board (20) to control the inflation and deflation of the corresponding airbag unit.

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