Multistage composite air bag for external counterpulsation

Abstract

The multi-stage composite air bag for external counterpulsation comprises a shank air bag and a hip-leg air bag, each of the shank air bag and the hip-leg air bag comprises a wrapping part and an extending part, each wrapping part is provided with an outer bag and a plurality of inner bags, the inner bags are located on the inner sides of the wrapping parts, the outer bags are located on the outer sides of the wrapping parts, and the extending parts are located on the outer sides of the outer bags. The inflation and deflation assembly penetrates through the outer bag through an air hole to be communicated with the inner bag, and the air hole is formed in the outer bag; the shank air bag covers the ankle and the calf, the hip-leg air bag comprises a hip air bag and a leg air bag, the hip air bag covers the hip, and the leg air bag covers the thigh; and the control mechanism controls the air source to inflate and deflate the air bags in sequence. The multiple stages of air bags are matched with the body parts respectively, fitting is tighter, the pressure of the air bags can be sequentially controlled, the wrapping part of the supporting body is arranged to be matched with the human body, fitting with the body shape can be greatly facilitated, then the body is wound through the extending part for wrapping, and wearing is convenient.

Description

Technical Field

[0001] The utility model relates to a medical device for a high-efficiency and miniaturized external counterpulsation device, in particular to a multi-stage composite air bag with high-efficiency, energy-saving and real-time monitoring for an external counterpulsation device. Background Art

[0002] The enhanced extracorporeal counterpulsation device (hereinafter referred to as EECP) is a mechanical circulatory assist device originally invented in my country. It is mainly used to treat cardiovascular and cerebrovascular diseases. It has a history of more than 40 years, and its therapeutic effect has been recognized by the medical community at home and abroad.

[0003] The principle of extracorporeal counterpulsation is to drive the blood from the lower half of the human body back to the upper half through external mechanical drive, thereby increasing the blood supply to the heart, brain, kidneys, eyes, ears and other organs, unblocking blood vessels, and achieving the purpose of treating ischemic diseases.

[0004] For more than 40 years, EVCP devices have used compressed air to inflate air bags wrapped around limbs, and achieved the purpose of driving blood by applying compressed air to the limbs. To ensure the therapeutic effect, the pressurization must be strictly coordinated with the action of the heart. Specifically, one inflation and one deflation are required in one cardiac cycle, so the air bag must be pressurized efficiently and blood must be driven back to the upper body within a limited time to increase blood supply to the organs. Therefore, existing EVCP devices have strict requirements on the procedures of inflation and deflation and their related parameters, gas source pressure, etc.

[0005] The applicant's recent research found that effective inflation and deflation of the airbag is particularly important for the normal operation of the EECP: the pressure and speed of applying pressure to the limbs are not the greater and faster the better, but it is necessary to apply the most appropriate speed and strength of pressure to the limbs effectively according to the specific treatment target through a series of tests, so as to drive more blood back to the upper body and achieve the purpose of treatment; the deflation process must optimize the most suitable deflation time and release the pressure at the fastest speed to fully reduce the body's systolic blood pressure and reduce the patient's heart resistance and oxygen consumption when ejecting blood.

[0006] Under normal circumstances, the external counterpulsation cuff is used as a pressurization terminal device. The higher the fit between the cuff and the limb, the smaller the gap will be. Since most existing traditional cuffs use canvas as the outer bag, it is difficult to maintain a high degree of fit with the human body. The reason is related to the strength of the operator when bandaging. After a period of counterpulsation, the gap between the cuff and the limb will increase due to the expansion of the air bag. As a result, the set pressure of the compressor does not effectively act on the limb, resulting in energy waste and affecting the treatment effect. The pressure monitoring of traditional counterpulsation monitors the pressure of the gas tank, and does not monitor the pressure inside the cuff.

[0007] In the past, in order to solve these problems, a hard plastic plate was added between the inner and outer bladders, and artificial leather was used to make the outer bladder. However, although this method can increase some restrictions on the outward expansion of the inner bladder, it has higher requirements for the bandaging of the bladder cuff and the effect is not very good.

[0008] Therefore, it is necessary to provide a highly efficient composite airbag structure device for external counterpulsation, so as to achieve effective compression of limbs during inflation while reducing the outward expansion of the pressurizing device. Summary of the invention

[0009] The utility model aims to overcome the problems existing in the prior art and provide a composite air bag for external counterpulsation which is easy to use, consumes less gas and fits tightly.

[0010] The technical solution of this utility model is as follows:

[0011] A multi-stage composite airbag for external counterpulsation, characterized in that: the airbag comprises a calf airbag and a buttocks-leg airbag, the calf airbag and the buttocks-leg airbag each comprise a wrapping portion and an extension portion, the wrapping portion is provided with an outer bag and an inner bag, wherein a plurality of inner bags are provided and are located on the inner side of the wrapping portion, the outer bag is located on the outer side of the wrapping portion, an inflating and exhausting assembly passes through the outer bag through an air hole and is connected to the inner bag, and the air hole is provided on the outer bag;

[0012] The calf airbag covers the area above the ankle and the calf. Two sets of calf airbags are provided to cover two calves respectively. A first inner bag and a second inner bag are provided in the calf airbag. The first inner bag and the second inner bag are arranged up and down along the calf.

[0013] The hip-leg airbag includes a hip airbag and a leg airbag, wherein the hip airbag covers the hip and the leg airbag covers the thigh; the leg airbag includes a third inner bag and a fourth inner bag, and the hip airbag includes a fifth inner bag.

[0014] The control mechanism controls the gas source to inflate and exhaust the first inner bag, the second inner bag, the third inner bag, the fourth inner bag and the fifth inner bag in sequence.

[0015] The inflation and exhaust assembly includes an electromagnetic valve group, an air pressure pump, an air guide tube, and an inflation and exhaust electromagnetic valve. The electromagnetic valve group is used to receive a control signal from a control mechanism. The control signal controls the working pressure of the air pressure pump in real time. The control signal includes an inflation signal, a holding signal, and a release signal.

[0016] When the inflation signal is received, the compressed air generated by the air pump passes through the air tank, triggers the inflation solenoid valve of the inflation and exhaust solenoid valve, and passes into the inner bag through the air guide tube and the air hole.

[0017] When the holding signal is received, the inflation solenoid valve of the inflation and exhaust solenoid valve is closed, and the inflation into the inner bag is stopped. This is the inner bag pressure holding state, and the deformation of the inner bag is maintained;

[0018] When a release signal is received, the exhaust valve of the charging and exhaust solenoid valve starts exhausting, and the air in the inner bag is emptied through the air hole.

[0019] Furthermore, the extension portion is formed by extending from one end or both ends of the wrapping portion, the inner capsule is arranged on the inner side of the wrapping portion, and the outer capsule is arranged on the outer side of the wrapping portion, the deformation volume of the outer capsule is smaller than the deformation volume of the inner capsule, and the deformation volume ratio of the outer capsule to the deformation volume of the inner capsule is 1:5~15.

[0020] Furthermore, the calf airbag is provided with a calf support body, the calf support body has a C-shaped cross-section, one side of the calf support body is provided with an opening and connected to the extension portion, the upper end portion and the lower end portion of the calf support body have the same circumference, the outer bag is provided on the outside of the calf support body, and the inner bag is located on the inner side of the side opposite to the opening of the calf support body.

[0021] Furthermore, the hip-leg airbag comprises a leg-hip support body, and the leg-hip support body comprises a hip wrapping part and two leg wrapping parts, and both sides of the hip wrapping part are connected to the extension part.

[0022] The two leg wrapping parts are arranged at the lower part of the buttocks wrapping part and are respectively connected to the buttocks wrapping part as a whole, the upper part of the side where the two leg wrapping parts are connected is connected as a whole, and the lower part of the end where the two leg wrapping parts are connected is staggered.

[0023] The two sides of the leg wrapping part are connected with extension parts, and the extension parts are connected to form a columnar structure that is larger at the top and smaller at the bottom.

[0024] Furthermore, it also includes a thigh airbag, which includes the thigh support body, which is an arc-shaped cylinder, one side of the thigh support body is provided with an opening and is connected to the extension part, the circumference of the upper end of the thigh support body is greater than the circumference of the lower end, the outer bag is arranged on the outside of the arc-shaped cylinder, and the inner bag is located on the inner side of the side opposite to the opening of the thigh support body.

[0025] Furthermore, the multiple inner bags are arranged longitudinally and are respectively located at the bottom and both sides of the leg and hip support body or at the bottom and both sides of the thigh support body.

[0026] Furthermore, the inner capsule includes a plurality of sub-inner capsules and a main inner capsule, the sub-inner capsules are arranged longitudinally with the main inner capsule, and the sub-inner capsules are arranged transversely, the main inner capsule is connected with the inflation and exhaust assembly through air holes, and the plurality of sub-inner capsules are connected with the inflation and exhaust assembly through branch holes and the main hole, the branch holes are located in each of the sub-inner capsules, and the branch holes are connected with the main hole through pipelines.

[0027] Furthermore, the ratio of the sum of the volume of the main inner capsule and the volume of the sub-inner capsule is 0.7~2:1.

[0028] Furthermore, a pressure sensor is arranged in the main inner bag. Beneficial Effects

[0029] The multi-stage airbags are adapted to the body parts respectively, fitting more closely and can sequentially control the airbag pressure. The wrapping part of the support body is adapted to the human body setting, which can greatly facilitate fitting with the body shape, and then bypasses the body through the extension part to wrap it. After the inner bag is supplied with air, the inner bag deforms greatly and fits the body further, while the outer bag deforms little and will not reduce its volume even if squeezed. Therefore, the gas in the bag deforms along the direction of the inner bag, and a smaller one can be used to achieve a tight fit at best, so the exhaust volume is also reduced, which can greatly shorten the control time, improve the control efficiency, and improve the effect of extracorporeal counterpulsation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a schematic diagram of the structure of a multi-stage airbag.

[0032] Figure 2 It is a schematic diagram of the structure of the thigh support body.

[0033] Figure 3 This is a schematic diagram of a setting form of multiple inner capsules.

[0034] Figure 4 This is a schematic diagram of another arrangement of multiple inner capsules.

[0035] The following are the descriptions of the reference numerals:

[0036] 1 - first airbag, 2 - second airbag, 3 - third airbag, 4 - fourth airbag, 5 - fifth airbag,

[0037] 6 - air hole, 7 - inflation and exhaust component, 8 - calf support body, 9 - thigh support body, 10 - buttocks wrapping part, 11 - leg wrapping part, 12 - extension part, 13 - outer bag, 14 - inner bag, 15 - main inner bag, 16 - sub-inner bag, 17 - Velcro. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Example

[0042] A multi-stage composite air bag for external counterpulsation, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the airbag includes a calf airbag and a hip-leg airbag, and the calf airbag and the hip-leg airbag both include a wrapping portion and an extension portion 12, and the wrapping portion is provided with an outer bag 13 and an inner bag 14, wherein a plurality of inner bags 14 are provided and are located on the inner side of the wrapping portion, and the outer bag 13 is located on the outer side of the wrapping portion, and the inflation / exhaust assembly 7 passes through the outer bag 13 through the air hole 6 to communicate with the inner bag 14, and the air hole 6 is provided on the outer bag 13;

[0043] The calf airbag includes a first inner bag 1 and a second inner bag 2. The first inner bag 1 covers the upper part of the ankle, and the second inner bag 2 covers the calf. The calf airbag is provided with two sets, covering two calves respectively.

[0044] The hip-leg airbag comprises a third inner bag 3, a fourth inner bag 4 and a fifth inner bag 5. The third inner bag 3 and the fourth inner bag 4 respectively cover the two thighs, and the fifth inner bag 5 covers the buttocks.

[0045] The control mechanism controls the gas source to inflate and deflate each airbag in sequence.

[0046] Controlling the gas source to inflate the first inner capsule 1, the second inner capsule 2, the third and fourth inner capsules 4 at the same time, and then the fifth inner capsule 5 sequentially can effectively apply pressure to the blood vessels, promote blood flow, and achieve a good extracorporeal counterpulsation effect.

[0047] The adaptive setting of the wrapping part of the support body can greatly facilitate fitting with the user's body shape and be in closer contact with the user. It is then wrapped by the extension part 12 for easy fixation. After the inner bag 14 is supplied with air, the inner bag 14 is deformed greatly and fits the body further. The outer bag 13 is deformed little and will not shrink in volume even if squeezed. Therefore, the gas in the bag is deformed along the direction of the inner bag 14. A smaller one can be used to achieve a tight fit at best, so the exhaust volume is also reduced, which can greatly shorten the control time, improve the control efficiency, and improve the effect of extracorporeal counterpulsation.

[0048] The inflation and exhaust assembly 7 includes an electromagnetic valve group, an air pressure pump, an air guide tube, and an inflation and exhaust electromagnetic valve. The electromagnetic valve group is used to receive a control signal from a control mechanism. The control signal controls the working pressure of the air pressure pump in real time. The control signal includes an inflation signal, a holding signal, and a release signal.

[0049] When the inflation signal is received, the compressed air generated by the air pressure pump passes through the air storage tank, triggers the inflation solenoid valve of the inflation and exhaust solenoid valve, and passes through the air guide pipe and the air hole 6 into the inner bag 14.

[0050] When the holding signal is received, the inflation solenoid valve of the inflation and exhaust solenoid valve is closed, and the inflation into the inner bag 14 is stopped. This is the pressure-maintaining state of the inner bag 14, and the deformation of the inner bag 14 is maintained;

[0051] When the release signal is received, the exhaust valve of the inflation and exhaust solenoid valve starts exhausting, and the air in the inner bag 14 is emptied through the air hole 6.

[0052] Furthermore, the extension portion 12 is formed by extending from one end or both ends of the wrapping portion, the inner capsule 14 is arranged on the inner side of the wrapping portion, and the outer capsule 13 is arranged on the outer side of the wrapping portion, the deformation volume of the outer capsule 13 is smaller than the deformation volume of the inner capsule 14, and the deformation volume ratio of the outer capsule 13 to the deformation volume of the inner capsule 14 is 1:5~15.

[0053] The ratio of the outer capsule 13 to the inner capsule 14 in this ratio can achieve a better balance between the difference in restraint force and deformation. If the deformation of the outer capsule 13 is too small, the inner capsule 14 will move inside the outer capsule 13. If the deformation volume of the outer capsule 13 is too small, it will be inconvenient to observe the deformation state of the inner capsule 14. The outer capsule 13 and the inner capsule 14 designed in this way can exert pressure with better effect.

[0054] The outer capsule 13 is a cavity formed by connecting a hard portion and a connecting portion on the other side, the inner capsule 14 is located in the cavity, and the air hole 6 is connected to the inner capsule 14 through the hard portion.

[0055] (1) The inner capsule 14 of the utility model can be arranged in the cavity formed by the outer capsule 13. The outer capsule 13 and the connecting part form a cavity for accommodating the inner capsule 14. The inner capsule 14 is arranged in the cavity. The split design is convenient for maintenance and cleaning.

[0056] (2) The inner bag 14 and the outer bag 13 may also be formed into a whole, which has good fixity and a more precise force position.

[0057] (3) It achieves a close fit with the body, thus achieving better pressure effect, reducing air leakage, more accurate positioning, less noise, and avoiding user discomfort

[0058] The outer bag 13 has protrusions evenly distributed on its surface. The protrusions can reduce the deformation of the outer bag 13, so that the outer bag 13 does not increase in thickness while reducing the deformation, so that the outer bag 13 can be designed to be thinner and lighter, and the ventilation effect can be enhanced.

[0059] Furthermore, the raised structure can enhance the overall strength of the outer bag 13, constrain the gas, and expand toward the inner bag 14, thereby achieving precise extrusion.

[0060] Furthermore, the calf airbag is provided with a calf support body 8, the cross-section of the calf support body 8 is C-shaped, one side of the calf support body 8 is provided with an opening connected to the extension part 12, the upper end and the lower end of the calf support body 8 have the same circumference, the outer bag 13 is provided on the outside of the calf support body 8, and the inner bag 14 is located on the inner side of the side of the calf support body 8 opposite to the opening.

[0061] The design of the support body provides a fixed form for wearing, which changes the traditional soft binding state. It can locate the position relatively accurately. The open design is convenient for wearing and the comfort is greatly improved. In order to maintain the stability of the connection state, traditionally, strong constraints are adopted, which greatly affects the user experience.

[0062] When in use, the wearer is in the looking up position, and the opening is buckled in from the back of the leg so that the bottom of the support body fits against the back of the leg, and the opening at the front end is pulled and fixed by the extension part 12. At this time, the calf support body 8 is in a stable wearing state and is not easy to slide. The deformation of the inner bag 14 is changed from full coverage to half coverage, which is more accurately aligned with the blood vessel position, changing the traditional bag sleeve design that fully wraps the leg, and greatly improving the comfort and extrusion accuracy.

[0063] Furthermore, the hip-leg airbag includes a leg-hip support body, and the leg-hip support body includes a hip wrapping portion 10 and two leg wrapping portions 11, and both sides of the hip wrapping portion 10 are connected to the extension portion 12.

[0064] The two leg wrapping parts 11 are arranged at the lower part of the buttocks wrapping part 10 and are respectively connected to the buttocks wrapping part 10 as a whole. The upper part of the side where the two leg wrapping parts are connected is connected as a whole. The lower part of the end where the two leg wrapping parts 11 are connected is staggered.

[0065] The two sides of the leg wrapping portion 11 are connected with extension portions 12, and the extension portions 12 are connected to form a columnar structure that is larger at the top and smaller at the bottom.

[0066] The buttocks wrapping part 10 and the two leg wrapping parts 11 cover the buttocks and thighs respectively. The connection between the thighs and the buttocks plays a restraining role to prevent the separately designed buttocks wrapping part 10 from slipping off.

[0067] When in use, the hip wrapping part 10 is wrapped around the waist, point A of the leg wrapping part 11 is passed around the thigh and connected to the point on the opposite side through the Velcro 17, and point C of the leg wrapping part 11 is passed around the thigh and connected to the point D on the opposite side through the Velcro 17, thereby completing the leg bag fitting.

[0068] The utility model can also set the leg airbag separately, specifically, set two thigh airbags, respectively covering the thighs, specifically the sixth airbag, which is set above the knee, between the second inner bag 2 and the third inner bag 3.

[0069] The specific sixth airbag, that is, the thigh airbag, includes the thigh support body 9, which is an arc-shaped cylinder. One side of the thigh support body 9 is provided with an opening and is connected to the extension part 12. The circumference of the upper end of the thigh support body 9 is greater than the circumference of the lower end. The outer bag 13 is arranged on the outside of the arc-shaped cylinder, and the inner bag 14 is located on the inner side of the side opposite to the opening of the thigh support body 9.

[0070] The thigh support body 9 and the calf support body 8 are designed separately, which not only ensures the blood vessel squeezing force required for counterpulsation, but also does not require a full-coverage one-piece device, thereby improving comfort.

[0071] The multiple inner capsules 14 are arranged longitudinally and are respectively located at the bottom and both sides of the support body.

[0072] The multiple inner bags 14 include calf air bags which can be designed as a first inner bag 1 and a second inner bag 2. The thigh air bags can also be set to two levels, that is, two inner bags 14 are set. The inner bags of the two thighs can be arranged up and down along the thighs. The buttocks air bags include a fifth air bag 5, which includes a left buttocks inner bag and a right buttocks inner bag, which are respectively located in the left half and right half of the buttocks.

[0073] The thigh airbag, buttocks airbag and calf airbag are all independently connected to the air supply component and independently controlled, with high control accuracy and good counterpulsation effect.

[0074] The design of multiple inner capsules 14 can effectively adapt to the muscle shape, fit the body part, and achieve precise positioning.

[0075] The inner bag 14 includes a plurality of sub-inner bags 16 and a main inner bag 15. The sub-inner bags 16 are arranged longitudinally with the main inner bag 15, and the sub-inner bags 16 are arranged transversely. The main inner bag 15 is connected with the inflation and exhaust assembly 7 through the air hole 6, and the plurality of sub-inner bags 16 are connected with the inflation and exhaust assembly 7 through the branch holes and the main hole. The branch holes are located in each of the sub-inner bags 16, and the branch holes are connected with the main hole through pipelines.

[0076] The main hole and the lateral hole can effectively control the expansion and release of the sub-inner capsule 16, and reduce the connecting pipelines and the structure of the external pipelines, thereby ensuring stability and reducing structural complexity.

[0077] Furthermore, the ratio of the sum of the volume of the main inner capsule 15 and the volume of the sub-inner capsule 16 is 0.7-2:1.

[0078] Furthermore, a pressure sensor is provided in the main inner bag 15. The pressure data in the bag is detected by the pressure sensor.

[0079] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A multi-stage composite airbag for external counterpulsation, characterized in that: The airbag comprises a calf airbag and a hip-leg airbag, each of which comprises a wrapping portion and an extension portion, the wrapping portion is provided with an outer bag and an inner bag, wherein a plurality of inner bags are provided and are located on the inner side of the wrapping portion, the outer bag is located on the outer side of the wrapping portion, and the inflation and exhaust assembly passes through the outer bag through an air hole to communicate with the inner bag, and the air hole is provided on the outer bag; The calf airbag covers the area above the ankle and the calf. Two sets of calf airbags are provided to cover two calves respectively. A first inner bag and a second inner bag are provided in the calf airbag. The first inner bag and the second inner bag are arranged up and down along the calf. The hip-leg airbag includes a hip airbag and a leg airbag, wherein the hip airbag covers the hip and the leg airbag covers the thigh; the leg airbag includes a third inner bag and a fourth inner bag, and the hip airbag includes a fifth inner bag. The control mechanism controls the gas source to inflate and exhaust the first inner bag, the second inner bag, the third inner bag, the fourth inner bag and the fifth inner bag in sequence.

2. A multi-stage composite airbag for external counterpulsation according to claim 1, characterized in that: The inflation and exhaust assembly includes a solenoid valve group, an air pressure pump, an air guide tube, and an inflation and exhaust solenoid valve. The solenoid valve group is used to receive a control signal from a control mechanism. The control signal controls the working pressure of the air pressure pump in real time. The control signal includes an inflation signal, a holding signal, and a release signal. When the inflation signal is received, the compressed air generated by the air pressure pump passes through the air storage tank, triggers the inflation solenoid valve of the inflation and exhaust solenoid valve, and passes into the inner bag through the air guide tube and the air hole; When the holding signal is received, the inflation solenoid valve of the inflation and exhaust solenoid valve is closed, and the inflation into the inner bag is stopped. This is the inner bag pressure holding state, and the deformation of the inner bag is maintained; When a release signal is received, the exhaust valve of the charging and exhaust solenoid valve starts exhausting, and the air in the inner bag is emptied through the air hole.

3. The multi-stage composite airbag for external counterpulsation according to claim 1, characterized in that: The extension portion is formed by extending from one end or both ends of the wrapping portion, the inner capsule is arranged on the inner side of the wrapping portion, and the outer capsule is arranged on the outer side of the wrapping portion. The deformation volume of the outer capsule is smaller than the deformation volume of the inner capsule, and the ratio of the deformation volume of the outer capsule to the deformation volume of the inner capsule is 1:5~15.

4. The multi-stage composite airbag for external counterpulsation according to claim 1, characterized in that: The calf airbag is provided with a calf support body, the cross-section of the calf support body is C-shaped, one side of the calf support body is provided with an opening and connected to the extension part, the upper end and the lower end of the calf support body have the same circumference, the outer bag is arranged on the outside of the calf support body, and the inner bag is located on the inner side of the side opposite to the opening of the calf support body.

5. The multi-stage composite airbag for external counterpulsation according to claim 4, characterized in that: The hip-leg airbag comprises a leg-hip support body, the leg-hip support body comprises a hip wrapping part and two leg wrapping parts, and both sides of the hip wrapping part are connected to the extension part. The two leg wrapping parts are arranged at the lower part of the buttocks wrapping part and are respectively connected to the buttocks wrapping part as a whole, the upper part of the side where the two leg wrapping parts are connected is connected as a whole, and the lower part of the end where the two leg wrapping parts are connected is staggered. The two sides of the leg wrapping part are connected with extension parts, and the extension parts are connected to form a columnar structure that is larger at the top and smaller at the bottom.

6. The multi-stage composite airbag for external counterpulsation according to claim 4, characterized in that: It also includes a thigh airbag, which includes a thigh support body, which is an arc-shaped cylinder, one side of the thigh support body is provided with an opening connected to the extension part, the circumference of the upper end of the thigh support body is greater than the circumference of the lower end, the outer bag is arranged on the outside of the thigh support body of the arc-shaped cylinder, and the inner bag is located on the inner side of the side opposite to the opening of the thigh support body.

7. A multi-stage composite airbag for external counterpulsation according to claim 5 or 6, characterized in that: The multiple inner bags are arranged longitudinally and are respectively located at the bottom and both sides of the leg and buttocks support body or at the bottom and both sides of the thigh support body.

8. The multi-stage composite airbag for external counterpulsation according to claim 7, characterized in that: The inner capsule includes multiple sub-inner capsules and a main inner capsule. The sub-inner capsules are arranged longitudinally with the main inner capsule and laterally with each other. The main inner capsule is connected with the inflation and exhaust assembly through air holes. Multiple sub-inner capsules are connected with the inflation and exhaust assembly through branch holes and the main hole. The branch holes are located in each sub-inner capsule, and the branch holes are connected with the main hole through pipelines.

9. The multi-stage composite airbag for external counterpulsation according to claim 8, characterized in that: The ratio of the sum of the volume of the main inner capsule and the volume of the sub-inner capsule is 0.7~2:

1.

10. The multi-stage composite airbag for external counterpulsation according to claim 8, characterized in that: A pressure sensor is arranged in the main inner bag.

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