A valve for an external counterpulsation device

Abstract

The present invention discloses a valve for an extracorporeal counterpulsation device, comprising a valve body, an air inlet channel and an air exhaust channel arranged on the valve body; a flow regulating device is arranged on the valve body; the flow regulating device comprises a first regulating device and a second regulating device respectively arranged on the air inlet channel and the air exhaust channel; the first regulating device and the second regulating device are used to control the gas flow in the air inlet channel and the air exhaust channel; a switching device is arranged in the flow regulating device, which is used to switch and control the series state and the isolation state of the flow regulating device and the air inlet channel and the air exhaust channel; the design combines the flow regulating device with the control valve, and the mutual cooperation of the flow regulating device and the valve can realize the pressure control of the output end air bag without affecting the pressure of the air source air path; the flow regulating device can accurately control and linearly control the size of the output air flow, and the step-by-step control of the air bag pressure can be realized through the accurate adjustment and linear adjustment of the flow regulating device.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a valve for an extracorporeal counterpulsation device. Background Art

[0002] The EVCP device is a device for treating cardiovascular and cerebrovascular diseases. The valve of the EVCP device delivers high-pressure gas to the designated airbag in sequence. The existing valve is only used for gas exchange when the airbag is inflated and deflated. When performing EVCP treatment clinically, there are many parameters that need to be adjusted, such as airbag pressure and valve response time. The airbag pressure directly affects the user experience of EVCP, and the airbag pressure is also affected by the force when the airbag is tied. Therefore, after the airbag is tied, only the inflation and deflation time and pressure of the airbag can be adjusted. However, due to the limitation of the valve, the actual adjustment parameter is only the valve opening and closing time, and the gas flow in the gas path cannot be adjusted. Summary of the invention

[0003] In order to solve the problem that the existing valves cannot simultaneously regulate the inflation and deflation time, pressure and gas flow in the gas circuit of the EVCP airbag, the present application provides a valve for an EVCP device.

[0004] A valve for an extracorporeal counterpulsation device, comprising a valve body, an air intake channel and an exhaust channel arranged on the valve body; a flow regulating device is arranged on the valve body; the flow regulating device comprises a first regulating device and a second regulating device respectively arranged on the air intake channel and the exhaust channel; the first regulating device and the second regulating device are used to control the gas flow in the air intake channel and the exhaust channel; a switching device is arranged in the flow regulating device, which is used to switch the series state and the isolation state of the flow regulating device and the air intake channel and the exhaust channel; the air intake channel comprises an air inlet, a first air intake channel, a second air intake channel, a third air intake channel, an outlet air port; one end of the first air inlet passage is connected to the air inlet; the first regulating device is arranged between the first air inlet passage and the second air inlet passage; the first control valve is arranged between the second air inlet passage and the third air inlet passage, and is used to control the on-off of the second air inlet passage and the third air inlet passage; the third air inlet passage and the air outlet are connected to each other; the first regulating device includes a first main air path and a first bypass air path arranged in parallel; the first main air path and the first flow regulating cavity are arranged in series; the first air inlet passage of the air inlet passage is connected to the first flow regulating cavity and the first bypass air path respectively via the switching device; the switching device The device comprises a first reversing cavity and a first reversing valve stem arranged in the first reversing cavity, wherein the first reversing valve stem is used to control the first air inlet channel to be connected to the first flow regulating cavity or the first bypass air path respectively; the exhaust channel is arranged on the valve body, and comprises a first exhaust channel, a second exhaust channel, a third exhaust channel, and an exhaust port; one end of the first exhaust channel is connected to the air outlet; the second control valve is arranged between the first exhaust channel and the second exhaust channel, and is used to control the on-off between the first exhaust channel and the second exhaust channel; the second regulating device is arranged between the second exhaust channel and the third exhaust channel; the third exhaust channel The second regulating device comprises a second main gas path, a second bypass gas path, a second reversing valve stem, a second flow regulating valve stem, a second reversing cavity, and a second flow regulating cavity; the second reversing cavity is provided with three cavities interconnected with each other, and a second reversing cavity partition is provided between the three cavities; the second reversing valve stem is installed in the second reversing cavity; the second reversing valve stem has the same shape and structure as the first reversing valve stem; the middle cavity of the second reversing cavity is interconnected with the third exhaust channel; the two ends of the second bypass gas path are respectively interconnected with the upper cavity of the second reversing cavity and the second exhaust channel;

[0005] Furthermore, the series connection state of the flow regulating device and the intake channel and the exhaust channel is that the gas in the intake channel and the exhaust channel must pass through the flow regulating device, and the flow regulating range of the regulating device is: rated maximum flow to; the isolation state is that the flow regulating device directly adjusts the gas flow passing through the flow regulating device to the rated maximum flow;

[0006] Furthermore, the first reversing cavity is provided with three cavities interconnected with each other, and a first reversing cavity partition is provided between the three cavities; the first reversing valve stem is installed in the first reversing cavity; the cylindrical flange provided on the first reversing valve stem cooperates with the cavity partition;

[0007] Furthermore, the middle cavity of the first reversing cavity is interconnected with the first air inlet channel; the right cavity of the first reversing cavity is interconnected with the second air inlet channel via the first bypass path; the left cavity of the first reversing cavity is interconnected with one end of the first flow regulating cavity;

[0008] Furthermore, the middle part of the first flow regulating cavity includes a first conical cavity and a second conical cavity; the small diameter end of the first conical cavity is connected to the large diameter end of the second conical cavity; the large diameter end of the first flow regulating cavity is connected to the left cavity of the first reversing cavity; the small diameter end of the first flow regulating cavity is connected to one end of the first main gas path, and one end of the first main gas path is connected to the second air inlet channel;

[0009] Furthermore, the communication interfaces of the first flow regulating cavity, the first reversing cavity and the first main gas path are respectively located on both sides of the first conical cavity and the second conical cavity;

[0010] Furthermore, the first flow regulating valve stem is arranged inside the first flow regulating cavity; the middle part of the first flow regulating valve stem includes a first cone and a second cone that are connected to each other; the first cone and the second cone are arranged corresponding to the first cone cavity and the second cone cavity;

[0011] Further, it is characterized in that: the taper of the second cone is greater than the taper of the second cone cavity; the diameter of the small diameter end of the first cone is equal to the diameter of the small diameter end of the first cone cavity; the difference between the cross-sectional area of ​​the large diameter end of the second cone cavity and the cross-sectional area of ​​the small diameter end of the second cone is greater than or equal to the cross-sectional area of ​​the first main gas path; the first cone and the second cone are respectively connected to the sliding ends arranged at both ends of the first flow regulating valve stem by a cylinder, and the diameter of the cylinder is equal to the diameter of the large diameter end of the adjacent first cone and the small diameter end of the second cone;

[0012] Furthermore, the first regulating device is also provided with a regulating control device for controlling the movement of the first reversing valve stem and the first flow regulating valve stem; the regulating control device comprises an electromagnet and a drive motor; the electromagnet is fixed on the valve body, and the output end of the electromagnet and the first reversing valve stem are fixedly mounted to each other; the drive motor is fixed on the valve body, and a lead screw is fixed at the end of the drive motor; the lead screw and the lead screw nut arranged at the end of the first flow regulating valve stem are matched with each other;

[0013] Furthermore, the second flow regulating chamber has the same structure as the first flow regulating chamber; the large diameter end of the second flow regulating chamber is interconnected with the lower chamber of the second reversing chamber; the small diameter end of the second flow regulating chamber is interconnected with one end of the second main gas path; the other end of the second main gas path is connected with the second exhaust channel; the connecting interfaces of the second flow regulating chamber, the second reversing chamber and the second main gas path are respectively located on both sides of the first conical cavity and the second conical cavity; the second flow regulating valve stem has the same structure as the first reversing valve stem.

[0014] The present invention provides a valve for an extracorporeal counterpulsation device, which comprises a valve body, an air inlet channel and an air exhaust channel arranged on the valve body; a flow regulating device is arranged on the valve body; the flow regulating device comprises a first regulating device and a second regulating device respectively arranged on the air inlet channel and the air exhaust channel; the first regulating device and the second regulating device are used to control the gas flow in the air inlet channel and the air exhaust channel; a switching device is arranged in the flow regulating device, which is used to switch the series connection state and the isolation state of the flow regulating device and the air inlet channel and the air exhaust channel; the present design combines the flow regulating device with the control valve, and the mutual cooperation of the flow regulating device and the valve can realize the pressure control of the output end air bag without affecting the pressure of the air source air path; the pressure at the air bag end of the extracorporeal counterpulsation device is set in advance, and the inflation time of the air bag is set according to the use The user's ECG signal changes in real time. The use of a flow regulating device and a control valve to control the pressure of the air bag avoids regulating the pressure of the compressor or the air tank, and avoids energy consumption due to changes in the air pressure of the compressor and the air tank. At the same time, the flow regulating device controlled by the drive motor can accurately control the position of the flow regulating valve stem, and at the same time, the size of the airflow output by the flow regulating device can be accurately controlled and linearly controlled. The precise and linear adjustment of the flow regulating device can achieve step-by-step control of the air bag pressure. Step-by-step control can ensure that the air bag pressure in the initial stage of treatment can act on the human body with a slowly increasing and decreasing trend, avoiding discomfort caused by excessive pressure in the first treatment. When the pressure in the air circuit suddenly increases, the pressure of the air bag will also suddenly increase. The flow regulating device and the valve can be used to assist in controlling the pressure of the air bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of a valve of an external counterpulsation device of the present invention;

[0016] Figure 2 A top view of a valve of an external counterpulsation device of the present invention;

[0017] Figure 3 A three-dimensional view of a valve of an external counterpulsation device of the present invention;

[0018] Figure 4 It is an AA cross-sectional view of a valve of an external counterpulsation device of the present invention;

[0019] Figure 5 A cross-sectional view of a flow regulating cavity of a valve of an external counterpulsation device of the present invention;

[0020] Figure 6 A full cross-sectional view of a flow regulating valve stem of an external counterpulsation device valve according to the present invention;

[0021] Figure 7 A half-section view of a flow regulating valve stem of an external counterpulsation device valve according to the present invention;

[0022] Figure 8 It is a BB cross-sectional view of a valve of an external counterpulsation device of the present invention;

[0023] Fig. 9 It is a CC cross-sectional view of a valve of an external counterpulsation device of the present invention;

[0024] Fig.10 It is a DD cross-sectional view of a valve of an external counterpulsation device of the present invention;

[0025] Fig.11 It is a partial cross-sectional view of a flow regulating cavity of a valve of an external counterpulsation device of the present invention;

[0026] Fig.12 A top view of a valve body of an external counterpulsation device valve of the present invention;

[0027] Fig.13 A top view of a valve of an external counterpulsation device of the present invention;

[0028] Fig.14 The present invention is a three-dimensional view of a valve of an external counterpulsation device. DETAILED DESCRIPTION

[0029] Please see attached Figure 1-14 , a valve for an external counterpulsation device, comprising a valve body 1, an air inlet channel 2 and an air outlet channel 3 arranged on the valve body;

[0030] The air intake passage 2 is also provided with a first regulating device 41 and a first control valve 42;

[0031] The exhaust passage 3 is also provided with a second regulating device 51 and a second control valve 52;

[0032] The valve body 1 is block-shaped, and the air inlet passage 2 is arranged on the valve body 1;

[0033] The air inlet channel 2 includes an air inlet 21, a first air inlet channel 22, a second air inlet channel 23, a third air inlet channel 24, and an air outlet 25;

[0034] One end of the first air inlet channel 22 is connected to the air inlet 21;

[0035] The first regulating device 41 is disposed between the first air intake passage 22 and the second air intake passage 23;

[0036] The first regulating device 41 comprises a first regulating device valve body 411;

[0037] The first regulating device valve body 411 is fixedly arranged on the valve body 1;

[0038] The first regulating device valve body 411 includes a first main gas path 412, a first bypass gas path 413, a first reversing valve stem 414, a first flow regulating valve stem 415, a first reversing cavity 416, and a first flow regulating cavity 417;

[0039] The first reversing cavity 416 is provided with three cavities interconnected with each other, and a first reversing cavity partition 4161 is provided between the three cavities;

[0040] The first reversing valve stem 414 is installed in the first reversing cavity 416;

[0041] The first reversing valve stem 414 is cylindrical in shape as a whole, and is provided with two cylindrical flanges 4141;

[0042] The flange 4141 and the cavity partition 4161 are arranged in cooperation with each other;

[0043] The difference between the cross-sectional area of ​​the flange 4141 of the first reversing valve stem 414 and the cross-sectional area of ​​other positions of the first reversing valve stem 414 is greater than the cross-sectional areas of the first air inlet passage 22, the second air inlet passage 23, and the third air inlet passage 24;

[0044] The middle cavity of the first reversing cavity 416 is interconnected with the first air inlet passage 22;

[0045] The two ends of the first bypass air path 413 are respectively connected to the right side cavity of the first reversing cavity 416 and the second air inlet channel 23;

[0046] The first flow regulating cavity 417 is arranged in parallel with the first reversing cavity 416;

[0047] The middle part of the first flow regulating cavity 417 includes a first conical cavity 4171 and a second conical cavity 4172, and cylindrical cavities are provided at both ends;

[0048] The small diameter end of the first conical cavity 4171 and the large diameter end of the second conical cavity 4172 are connected to each other;

[0049] The large diameter end of the first flow regulating cavity 417 is connected to the left cavity of the first reversing cavity 416;

[0050] The small diameter end of the first flow regulating cavity 417 is connected to one end of the first main gas path 412; the other end of the first main gas path 412 is connected to the second air inlet channel 23;

[0051] The communication interfaces of the first flow regulating cavity 417, the first reversing cavity 416 and the first main gas path 412 are respectively located on both sides of the first conical cavity 4171 and the second conical cavity 4172;

[0052] The first flow regulating valve stem 415 is disposed inside the first flow regulating cavity 417;

[0053] The first flow regulating valve stem 415 comprises sliding end portions 4151 arranged at both ends and sealingly slidingly matched with the cylindrical cavities at both ends of the first flow regulating cavity 417;

[0054] The middle portion of the first flow regulating valve stem 415 is disposed correspondingly to the first conical cavity 4171 and the second conical cavity 4172;

[0055] The middle portion of the first flow regulating valve stem 415 includes a first cone 4152 and a second cone 4153 which are connected to each other;

[0056] The first cone 4152 and the first cone cavity 4171 are matched with each other;

[0057] The taper of the second tapered body 4153 is greater than the taper of the second tapered cavity 4172;

[0058] The diameter of the small diameter end of the first cone 4152 is equal to the diameter of the small diameter end of the first cone cavity 4171;

[0059] The difference between the cross-sectional area of ​​the large diameter end of the second conical cavity 4172 and the cross-sectional area of ​​the small diameter end of the second conical body 4153 is greater than or equal to the cross-sectional area of ​​the first main gas path 412;

[0060] The ends of the first cone 4152 and the second cone 4153 are connected to the sliding end 4151 by a cylinder, and the diameter of the cylinder is equal to the diameter of the large diameter end of the adjacent first cone 4152 and the small diameter end of the second cone 4153;

[0061] The first regulating device 41 is also provided with a regulating control device for controlling the movement of the first reversing valve stem 414 and the first flow regulating valve stem 415;

[0062] The regulating control device includes an electromagnet 61 and a driving motor 62;

[0063] The electromagnet 61 is fixed on the valve body 1, and the output end of the electromagnet 61 and the first reversing valve stem 414 are fixedly mounted to each other;

[0064] The driving motor 62 is fixed on the valve body 1, and a lead screw 621 is fixed at the end of the driving motor 62;

[0065] The lead screw 621 is matched with the lead screw nut 4154 disposed at the end of the first flow regulating valve stem 415;

[0066] The first control valve 42 is disposed between the second air intake passage 23 and the third air intake passage 24, and is used to control the opening and closing of the second air intake passage 23 and the third air intake passage 24;

[0067] The third air inlet channel 24 and the air outlet 25 are connected to each other;

[0068] The exhaust channel 3 is arranged on the valve body 1, and includes a first exhaust channel 31, a second exhaust channel 32, a third exhaust channel 33, and an exhaust port 34;

[0069] One end of the first exhaust channel 31 is connected to the air outlet 25;

[0070] The second control valve 52 is disposed between the first exhaust channel 31 and the second exhaust channel 32, and is used to control the on-off between the first exhaust channel 31 and the second exhaust channel 32;

[0071] The second regulating device 51 is disposed between the second exhaust passage 32 and the third exhaust passage 33;

[0072] The second adjusting device 51 has the same structure as the first adjusting device 41;

[0073] The second regulating device 51 comprises a second regulating device valve body 511;

[0074] The second regulating device valve body 511 is fixedly arranged on the valve body 1;

[0075] The second regulating device 51 includes a second main gas path 512, a second bypass gas path 513, a second reversing valve stem 514, a second flow regulating valve stem 515, a second reversing cavity 516, and a second flow regulating cavity 517;

[0076] The second reversing cavity 516 is provided with three cavities interconnected with each other, and a second reversing cavity partition 5161 is provided between the three cavities;

[0077] The second reversing valve stem 514 is installed in the second reversing cavity 516;

[0078] The second reversing valve stem 514 has the same shape and structure as the first reversing valve stem 414;

[0079] The middle cavity of the second reversing cavity 516 is interconnected with the third exhaust channel 33;

[0080] The two ends of the second bypass air path 513 are respectively connected to the upper cavity of the second reversing cavity 516 and the second exhaust channel 32;

[0081] The second flow regulating cavity 517 is arranged in parallel with the second reversing cavity 516;

[0082] The second flow regulating cavity 517 has the same structure as the first flow regulating cavity 417;

[0083] The large diameter end of the second flow regulating cavity 517 is connected to the lower cavity of the second reversing cavity 516;

[0084] The small diameter end of the second flow regulating cavity 517 is connected to one end of the second main gas path 512; the other end of the second main gas path 512 is connected to the second exhaust channel 32;

[0085] The communication interfaces of the second flow regulating cavity 517, the second reversing cavity 516 and the second main gas path 512 are respectively located on both sides of the first conical cavity 4171 and the second conical cavity 4172;

[0086] The second flow regulating valve stem 515 has the same structure as the first reversing valve stem 414;

[0087] The third exhaust passage 33 and the exhaust port 34 are interconnected.

[0088] When in use, the air inlet 21 is connected to the air source, the air outlet 25 is connected to the EVCP airbag, the first control valve 42 is opened, the second control valve 52 is closed, the gas enters the EVCP airbag through the air inlet channel 2, the first control valve 42 is closed, the second control valve 52 is opened, and the gas in the EVCP airbag is discharged through the exhaust channel 3. During use, the pressure of the EVCP airbag is adjusted as needed, and the first adjustment device is activated when the air inlet of the airbag needs to be adjusted. The air path through which the gas flows is controlled by the first reversing valve stem 414. When the first bypass air path 413 is interconnected with the first air inlet channel 22, the gas directly enters the EVCP airbag through the first bypass air path 413; when the first main air path 412 is interconnected with the first air inlet channel 22, the gas flows through the first flow regulating cavity 417. At this time, the flow of the gas flowing out of the first flow regulating cavity 417 can be controlled by controlling the position of the first flow regulating valve stem 415, and the minimum flow can be adjusted to zero. Similarly, the gas flow discharged from the exhaust channel 3 can be controlled by the second regulating device 51. At this time, the second reversing valve stem 514 controls the gas path through which the gas flows. When the second bypass gas path 513 is interconnected with the second exhaust channel 32, the gas is directly discharged through the second bypass gas path 513; when the second main gas path 512 is interconnected with the second exhaust channel 32, the gas flows through the second flow regulating cavity 517. At this time, the position of the second flow regulating valve stem 515 can be controlled to control the flow of the gas flowing out of the second flow regulating cavity 517, and the minimum flow can be adjusted to zero.

[0089] The design combines the flow regulating device and the control valve. The mutual cooperation of the flow regulating device and the valve can realize the pressure control of the output end airbag without affecting the pressure of the air source air circuit. The pressure of the airbag end of the external counterpulsation device is set in advance, and the inflation time of the airbag changes in real time according to the user's electrocardiogram signal. The pressure control of the airbag by using the flow regulating device and the control valve avoids the pressure adjustment of the compressor or the air tank, and avoids excessive consumption due to the pressure change of the compressor and the air tank. At the same time, the flow regulating device controlled by the drive motor can accurately control the position of the flow regulating valve stem, and at the same time, the size of the airflow output by the flow regulating device can be accurately controlled and linearly controlled. The step-by-step control of the airbag pressure can be achieved by accurately adjusting and linearly adjusting the flow regulating device. The step-by-step control can ensure that the airbag pressure in the initial stage of treatment can act on the human body with a slowly increasing and decreasing trend, avoiding the discomfort caused by excessive pressure in the first treatment. When the pressure in the air circuit suddenly increases, the pressure of the airbag will also increase suddenly. The cooperation of the flow regulating device and the valve can assist in controlling the pressure of the airbag.

[0090] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve for an external counterpulsation device, characterized in that: It comprises a valve body (1), an air intake passage (2) and an exhaust passage (3) arranged on the valve body (1); a flow regulating device is arranged on the valve body (1); the flow regulating device comprises a first regulating device (41) and a second regulating device (51) respectively arranged on the air intake passage (2) and the exhaust passage (3); the first regulating device (41) and the second regulating device (51) are used to control the gas flow in the air intake passage (2) and the exhaust passage (3); a switching device is arranged in the flow regulating device, which is used to switch the series connection state and the isolation state of the flow regulating device and the air intake passage (2) and the exhaust passage (3); the air intake passage (2) comprises an air inlet (21), a first air intake passage (22), a second air intake passage (51) and a second air intake passage (51); The invention relates to a first air intake channel (23), a third air intake channel (24), and an air outlet (25); one end of the first air intake channel (22) is connected to the air intake port (21); the first regulating device (41) is arranged between the first air intake channel (22) and the second air intake channel (23); the first control valve (42) is arranged between the second air intake channel (23) and the third air intake channel (24), and is used to control the opening and closing of the second air intake channel (23) and the third air intake channel (24); the third air intake channel (24) and the air outlet (25) are connected to each other; the first regulating device (41) comprises a first main air path (412) and a first bypass air path (413) arranged in parallel; the first main air path (412) and the third bypass air path (413) are connected to each other; A flow regulating chamber (417) is arranged in series; the first intake channel (22) of the intake channel (2) is respectively connected to the first flow regulating chamber (417) and the first bypass air path (413) via a switching device; the switching device includes a first reversing chamber (416) and a first reversing valve stem (414) arranged in the first reversing chamber (416), and the first reversing valve stem (414) is used to control the first intake channel (22) to be respectively connected to the first flow regulating chamber (417) or the first bypass air path (413); the exhaust channel (3) is arranged on the valve body (1), and includes a first exhaust channel (31), a second exhaust channel (32), a third exhaust channel (33), and an exhaust port (34); the first One end of the exhaust channel (31) is interconnected with the air outlet (25); the second control valve (52) is arranged between the first exhaust channel (31) and the second exhaust channel (32) and is used to control the on-off of the first exhaust channel (31) and the second exhaust channel (32); the second regulating device (51) is arranged between the second exhaust channel (32) and the third exhaust channel (33); the third exhaust channel (33) and the exhaust port (34) are interconnected; the second regulating device (51) comprises a second main air path (512), a second bypass air path (513), a second reversing valve stem (514), a second flow regulating valve stem (515), a second reversing cavity (516), and a second flow regulating cavity (517);The second reversing cavity (516) is provided with three cavities interconnected, and a second reversing cavity partition (5161) is provided between the three cavities; the second reversing valve stem (514) is installed in the second reversing cavity (516); the second reversing valve stem (514) has the same shape and structure as the first reversing valve stem (414); the middle cavity of the second reversing cavity (516) is interconnected with the third exhaust channel (33); the two ends of the second bypass gas path (513) are respectively interconnected with the upper cavity of the second reversing cavity (516) and the second exhaust channel (32). ; 2. The valve of the external counterpulsation device according to claim 1, characterized in that: The series connection state of the flow regulating device and the air intake channel (2) and the air exhaust channel (3) means that the gas in the air intake channel (2) and the air exhaust channel (3) must pass through the flow regulating device, and the flow regulating range of the regulating device is: rated maximum flow to 0; the isolated state means that the flow regulating device directly adjusts the gas flow passing through the flow regulating device to the rated maximum flow.

3. The valve of the external counterpulsation device according to claim 2, characterized in that: The first reversing cavity (416) is provided with three cavities interconnected with each other, and a first reversing cavity partition (4161) is provided between the three cavities; the first reversing valve stem (414) is installed in the first reversing cavity (416); the cylindrical flange (4141) provided on the first reversing valve stem (414) and the cavity partition (4161) are provided to cooperate with each other.

4. The valve of the EVCP device according to claim 3, characterized in that: The middle cavity of the first reversing cavity (416) is interconnected with the first air inlet channel (22); the right cavity of the first reversing cavity (416) is interconnected with the second air inlet channel (23) via the first bypass path (413); and the left cavity of the first reversing cavity (416) is interconnected with one end of the first flow regulating cavity (417).

5. The valve of the external counterpulsation device according to claim 4, characterized in that: The middle part of the first flow regulating cavity (417) includes a first conical cavity (4171) and a second conical cavity (4172); the small diameter end of the first conical cavity (4171) and the large diameter end of the second conical cavity (4172) are connected to each other; the large diameter end of the first flow regulating cavity (417) is connected to the left cavity of the first reversing cavity (416); the small diameter end of the first flow regulating cavity (417) is connected to one end of the first main gas path (412), and one end of the first main gas path (412) is also connected to the second air inlet channel (23).

6. The valve of the external counterpulsation device according to claim 5, characterized in that: The communication interfaces of the first flow regulating cavity (417), the first reversing cavity (416) and the first main gas path (412) are respectively located on both sides of the first conical cavity (4171) and the second conical cavity (4172).

7. The valve of the external counterpulsation device according to claim 6, characterized in that: The first flow regulating valve stem (415) is arranged inside the first flow regulating cavity (417); the middle part of the first flow regulating valve stem (415) includes a first cone (4152) and a second cone (4153) which are connected to each other; the first cone (4152) and the second cone (4153) are arranged corresponding to the first cone cavity (4171) and the second cone cavity (4172).

8. The valve of the external counterpulsation device according to claim 7, characterized in that: The taper of the second conical body (4153) is greater than the taper of the second conical cavity (4172); the diameter of the small diameter end of the first conical body (4152) is equal to the diameter of the small diameter end of the first conical cavity (4171); the difference between the cross-sectional area of ​​the large diameter end of the second conical cavity (4172) and the cross-sectional area of ​​the small diameter end of the second conical body (4153) is greater than or equal to the cross-sectional area of ​​the first main gas path (412); the first conical body (4152) and the second conical body (4153) are respectively connected to the sliding end portions (4151) arranged at both ends of the first flow regulating valve stem (415) by a cylinder, and the diameter of the cylinder is equal to the diameter of the large diameter end of the adjacent first conical body (4152) and the small diameter end of the second conical body (4153).

9. The valve of the external counterpulsation device according to claim 8, characterized in that: The first regulating device (41) is also provided with a regulating control device for controlling the movement of the first reversing valve stem (414) and the first flow regulating valve stem (415); the regulating control device comprises an electromagnet (61) and a drive motor (62); the electromagnet (61) is fixed on the valve body (1), and the output end of the electromagnet (61) and the first reversing valve stem (414) are fixedly mounted to each other; the drive motor (62) is fixed on the valve body (1), and a lead screw (621) is fixed to the end of the drive motor (62); the lead screw (621) and a lead screw nut (4154) arranged at the end of the first flow regulating valve stem (415) are arranged to match each other.

10. The valve of the external counterpulsation device according to claim 9, characterized in that: The second flow regulating chamber (517) has the same structure as the first flow regulating chamber (417); the large diameter end of the second flow regulating chamber (517) is interconnected with the lower chamber of the second reversing chamber (516); the small diameter end of the second flow regulating chamber (517) is interconnected with one end of the second main gas path (512); the other end of the second main gas path (512) is interconnected with the second exhaust channel (32); the connecting interfaces of the second flow regulating chamber (517) and the second reversing chamber (516) and the second main gas path (512) are respectively located on both sides of the first conical cavity (4171) and the second conical cavity (4172); the second flow regulating valve stem (515) has the same structure as the first reversing valve stem (414).

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