Air bag driving counterpulsation device

Abstract

The utility model provides an air bag driving counterpulsation device which comprises an air cylinder, a guide pipe communicated with the air cylinder and a piston arranged in the air cylinder to divide an inner cavity of the air cylinder into a first cavity and a second cavity with variable volumes. The first air bag and the second air bag are arranged on the guide pipe and communicated with the first cavity and the second cavity respectively, and the power mechanism drives the piston to reciprocate in the air cylinder in the axial direction. The power mechanism drives the piston to do reciprocating motion in the air cylinder in the axial direction so as to alternately change the volume of the first cavity and the volume of the second cavity and drive the first air bag and the second air bag to alternately expand and contract. The volume of the first cavity and the volume of the second cavity are alternately changed through the piston, the first air bag and the second air bag can be driven to alternately expand and contract only through few parts, the structure is simpler, and production and maintenance are easy.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an airbag driven counterpulsation device. Background Art

[0002] Intra-aortic balloon pump (IABP) is one of the mechanical circulatory assistance methods. It consists of a cylindrical balloon fixed to a catheter, which is placed in the thoracic aorta. The proximal end of the catheter is located at the end of the left subclavian artery, and the distal end is located at the renal artery. The balloon is inflated when the heart relaxes and deflated when the heart contracts. In most intra-aortic balloon pump systems, a diaphragm pump is used as the driving element to control the inflation and deflation of the balloon so that it is coordinated with the natural pulsation of the heart, thereby effectively improving blood circulation and heart function.

[0003] The Chinese invention patent application with publication number CN116271510A discloses a pulsed positive and negative pressure power device and a balloon counterpulsation system, wherein the power device includes a positive and negative pressure conversion chamber, a driving mechanism, a positive pressure chamber, a negative pressure chamber, and at least one output tube. The driving mechanism can drive the positive and negative pressure conversion chamber to contract and expand alternately. The positive pressure chamber and the negative pressure chamber are connected to the positive and negative pressure conversion chamber through two reverse one-way valves, and the inlet of each output tube is connected to the positive pressure chamber and the negative pressure chamber through two solenoid valves.

[0004] However, in order to drive the balloon to expand and contract, the pulsed positive and negative pressure power device and balloon counterpulsation system in the above-mentioned prior art require complex components such as a positive and negative pressure conversion chamber, a positive pressure chamber, a negative pressure chamber, multiple one-way valves, and a solenoid valve, which leads to an increase in failure points, complex maintenance and repair, and increased manufacturing difficulty and cost.

[0005] In view of this, it is necessary to improve the pulsed positive and negative pressure power device and balloon counterpulsation system in the prior art to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to disclose an airbag driven counterpulsation device, which is used to solve the many defects existing in the pulsed positive and negative pressure power device and the balloon counterpulsation system in the prior art, especially to realize the direct driving of the first airbag and the second airbag to expand and contract alternately by the piston. Only a few cylinder parts are needed to realize the driving of the first airbag and the second airbag to expand and contract alternately, and the structure is simpler, easy to produce and maintain.

[0007] To achieve the above-mentioned object, the utility model provides an airbag driven counterpulsation device, comprising: a cylinder, a conduit connected to the cylinder, a piston arranged in the cylinder to separate the inner cavity of the cylinder into a first chamber and a second chamber with variable volumes, a first airbag and a second airbag arranged in the conduit and connected to the first chamber and the second chamber respectively, and a power mechanism driving the piston to reciprocate axially in the cylinder;

[0008] The power mechanism drives the piston to reciprocate axially in the cylinder to alternately change the volumes of the first chamber and the second chamber, so as to drive the first airbag and the second airbag to expand and contract alternately.

[0009] As a further improvement of the utility model, the power mechanism drives the piston to move in the cylinder along a first direction to reduce the volume of the first chamber and expand the volume of the second chamber, so that the first airbag expands and the second airbag contracts.

[0010] As a further improvement of the present invention, the power mechanism drives the piston to move in the cylinder along a second direction opposite to the first direction to expand the volume of the first chamber and reduce the volume of the second chamber, so that the first airbag shrinks and the second airbag expands.

[0011] As a further improvement of the present invention, the airbag driven counterpulsation device also includes: a connecting tube arranged at the proximal end of the catheter, a first connecting tube arranged at the connecting tube and connected to the first chamber, a second connecting tube arranged at the connecting tube and connected to the second chamber, the first airbag and the second airbag are arranged successively front and back in the axial direction at the distal end of the catheter and are respectively connected to the first connecting tube and the second connecting tube, the first airbag formed at the distal end of the catheter is configured as a counterpulsation airbag, and the second airbag formed at the proximal end of the catheter is configured as a blocking balloon.

[0012] As a further improvement of the present invention, the power mechanism includes: a drive unit arranged on the outside of the cylinder, a sealed bearing arranged on the cylinder, the drive unit is constructed with a driving shaft connected to the sealed bearing and extending axially into the cylinder, and a coupling for connecting the driving shaft to the piston.

[0013] As a further improvement of the utility model, the airbag driven counterpulsation device further includes: an airtightness detection sensor for detecting the airtightness of the inner cavity of the cylinder.

[0014] As a further improvement of the utility model, a wear-resistant coating is disposed on the circumferential inner wall of the cylinder.

[0015] As a further improvement of the present invention, a lubricating coating is provided on the circumferential surface of the piston and / or the circumferential inner wall of the cylinder.

[0016] As a further improvement of the utility model, at least one sealing ring is arranged on the circumferential outer side of the piston.

[0017] Compared with the prior art, the beneficial effect of the present invention is that the piston is driven to reciprocate axially in the cylinder through a power mechanism to alternately change the volume of the first chamber and the second chamber, thereby driving the first airbag and the second airbag to expand and contract alternately. By alternately changing the volume of the first chamber and the second chamber through the piston, the present application only requires fewer components to drive the first airbag and the second airbag to expand and contract alternately, and the structure is simpler and easy to produce and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the airbag driven counterpulsation device disclosed in the utility model, wherein the first airbag is in an expanded state and the second airbag is in a compressed state;

[0019] Figure 2 The figure is a schematic diagram of the whole airbag driven counterpulsation device, wherein the first airbag is in a compressed state and the second airbag is in an expanded state;

[0020] Figure 3 Schematic diagram of applying wear-resistant coating and lubricating coating to the inner wall of the cylinder;

[0021] Figure 4 This is a schematic diagram of configuring a sealing ring on the outer side of the piston. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0023] It is particularly important to note that in the following embodiments, the term "axial" refers to Figure 1 or Figure 2 The term "first direction" refers to the direction indicated by the double-headed arrow X. Figure 1 The term "second direction" refers to the direction indicated by the arrow X2. Figure 2 The direction is indicated by the arrow X1.

[0024] Please refer to Figures 1 to 4 A specific implementation of an airbag driven counterpulsation device 100 is disclosed.

[0025] In this embodiment, the first airbag 30 and the second airbag 40 are respectively placed in specific positions in the patient's aorta through the catheter 60 to provide auxiliary support for blood circulation. Normally, the first airbag 30 is placed at the proximal end of the descending aorta, that is, the side close to the heart. In this position, during the diastole period, the first airbag 30 is inflated to increase the diastolic pressure at the aortic root, increase coronary blood flow and myocardial oxygen supply, and increase systemic blood perfusion. During the systole period, the first airbag 30 is deflated and contracted to provide more space for cardiac ejection, reduce cardiac afterload, reduce myocardial oxygen consumption, and enhance left ventricular ejection capacity. The position of the second airbag 40 can be inserted according to treatment needs. For example, the second airbag 40 can be set at a certain distance from the first airbag 30 at the distal or proximal end of the aorta. During the cardiac systole, the second airbag 40 is inflated to block the distal end of the aorta to prevent the blood advancing at the distal end from flowing back when the first airbag 30 is deflated and contracted. During the cardiac diastole, the second airbag 40 is deflated and contracted to avoid blocking the blood flow.

[0026] Ginseng Figure 1 and Figure 2 As shown, in this embodiment, the airbag driven counterpulsation device 100 includes: a cylinder 10, a conduit 60 connected to the cylinder 10, a piston 20 disposed in the cylinder 10 to separate the inner cavity of the cylinder 10 into a first chamber 11 and a second chamber 12 of variable volume, a first airbag 30 and a second airbag 40 disposed in the conduit 60 and connected to the first chamber 11 and the second chamber 12 respectively, and a power mechanism 50 driving the piston 20 to reciprocate along the axial direction in the cylinder 10; the power mechanism 50 drives the piston 20 to reciprocate along the axial direction in the cylinder 10 to alternately change the volume of the first chamber 11 and the second chamber 12, so as to drive the first airbag 30 and the second airbag 40 to expand and contract alternately. A closed cavity (not shown) is formed inside the cylinder 10 for accommodating gas and the piston 20. The power mechanism 50 can accurately control the movement speed and stroke of the piston 20 according to a preset control signal, thereby accurately adjusting the volume change of the first chamber 11 and the second chamber 12 .

[0027] Specifically, in this embodiment, the piston 20 is driven by the power mechanism 50 to reciprocate axially in the cylinder 10, and the volumes of the first chamber 11 and the second chamber 12 are alternately increased and decreased. When the volume of one of the chambers (the first chamber 11 or the second chamber 12) increases, the airbag connected thereto (the first airbag 30 or the second airbag 40) is filled with gas and expands; conversely, when the volume of one of the chambers (the first chamber 11 or the second chamber 12) decreases, the gas in the airbag connected thereto (the first airbag 30 or the second airbag 40) is extracted and shrinks, thereby achieving the expansion and contraction of the first airbag 30 and the second airbag 40 alternately in a predetermined order.

[0028] First of all, compared with the pulsed positive and negative pressure power device and balloon counterpulsation system in the prior art which require complex components such as a positive and negative pressure conversion chamber, a positive pressure chamber, a negative pressure chamber, multiple one-way valves and solenoid valves, the airbag-driven counterpulsation device 100 directly drives the first airbag 30 and the second airbag 40 to expand and contract alternately through the piston 20. Only a few components such as the cylinder 10, the piston 20, the first airbag 30 and the second airbag 40 are required to drive the first airbag 30 and the second airbag 40 to expand and contract alternately. The structure is simpler and easy to produce and maintain.

[0029] Secondly, compared with the pulsed positive and negative pressure power device and balloon counterpulsation system in the prior art, the positive and negative pressure conversion chamber is driven to contract or expand by the driving mechanism, and the working medium is controlled to flow between the positive and negative pressure conversion chamber, the positive pressure chamber and the negative pressure chamber through the one-way valve to form a positive pressure or negative pressure environment, and finally the driving method of the working medium entering and exiting the balloon is controlled by the solenoid valve. In this embodiment, the power mechanism 50 drives the piston 20 to reciprocate axially in the cylinder 10 to alternately change the volume of the first chamber 11 and the second chamber 12, thereby driving the first airbag 30 and the second airbag 40 to expand and contract alternately. The driving method of this embodiment directly drives the first airbag 30 and the second airbag 40 to expand and contract alternately by the piston 20, which has a shorter energy transfer chain, reduces the energy transfer links, and makes the first airbag 30 and the second airbag 40 respond faster, thereby improving work efficiency.

[0030] Furthermore, compared with the pulsed positive and negative pressure power device and the positive and negative pressure conversion chamber of the balloon counterpulsation system in the prior art, which requires additional positive pressure chamber and negative pressure chamber, the airbag driven counterpulsation device 100 eliminates the additional independent chamber, reduces the volume and weight, and improves space utilization.

[0031] In addition, compared with the pulsed positive and negative pressure power device and balloon counterpulsation system in the prior art, which requires the controller to accurately control the switching sequence and time of multiple solenoid valves to achieve positive and negative pressure conversion and orderly expansion and contraction of the balloon, the control logic is relatively complex. The airbag-driven counterpulsation device 100 only needs to control the reciprocating motion of the piston 20 to drive the first airbag 30 and the second airbag 40 to expand and contract alternately. The control logic is relatively simple and easy to achieve precise control.

[0032] Further, Figure 1 As shown, the power mechanism 50 drives the piston 20 to move in the cylinder 10 along the first direction to reduce the volume of the first chamber 11 and expand the volume of the second chamber 12, so that the first airbag 30 is expanded and the second airbag 40 is contracted. Figure 1The cylinder 10 moves in the direction indicated by the middle arrow X2 to reduce the volume of the first chamber 11 and expand the volume of the second chamber 12, thereby injecting the gas in the first chamber 11 into the first airbag 30 to inflate and expand the first airbag 30. At the same time, the gas in the second airbag 40 will be drawn into the second chamber 12 to deflate and shrink the second airbag 40.

[0033] Ginseng Figure 2 As shown, the power mechanism 50 drives the piston 20 to move in the cylinder 10 along a second direction opposite to the first direction to expand the volume of the first chamber 11 and reduce the volume of the second chamber 12, so that the first airbag 30 is contracted and the second airbag 40 is expanded. Figure 2 The cylinder 10 moves in the direction indicated by the middle arrow X1 to expand the volume of the first chamber 11 and reduce the volume of the second chamber 12. The gas in the first airbag 30 will be drawn into the first chamber 11 to deflate the first airbag 30 and shrink the first airbag 30. At the same time, the gas in the second chamber 12 will be injected into the second airbag 40 to inflate the second airbag 40 and expand the second airbag 40.

[0034] Ginseng Figure 1 and Figure 2 As shown, in this embodiment, the airbag driven counterpulsation device 100 further includes: a connecting tube 63 disposed at the proximal end of the catheter 60, a first connecting tube 61 disposed at the connecting tube 63 and connected to the first chamber 11, a second connecting tube 62 disposed at the connecting tube 63 and connected to the second chamber 12, a first airbag 30 and a second airbag 40 are successively arranged at the distal end of the catheter 60 in the axial direction and connected to the first connecting tube 61 and the second connecting tube 62 respectively, the first airbag 30 formed at the distal end of the catheter 60 is configured as a counterpulsation airbag, and the second airbag 40 formed at the proximal end of the catheter 60 is configured as a blocking balloon. A guide wire channel (not shown) is provided in the catheter 60.

[0035] Specifically, the power mechanism 50 drives the piston 20 along Figure 1 In the process of moving in the cylinder 10 in the direction indicated by the middle arrow X2 to reduce the volume of the first chamber 11 and expand the volume of the second chamber 12, the gas in the first chamber 11 will move along Figure 1 The gas is injected into the first connecting tube 61 in the direction indicated by the middle arrow A1, and then the gas is injected into the first airbag 30 through the first connecting tube 61 to inflate the first airbag 30 and expand the first airbag 30, thereby increasing the diastolic pressure of the aortic root, improving the coronary blood flow and myocardial oxygen supply, and increasing the blood perfusion of the whole body. At the same time, the gas in the second airbag 40 will be discharged along the second connecting tube 62. Figure 1The air is drawn into the second chamber 12 in the direction indicated by the middle arrow B1 to deflate the second airbag 40 and shrink the second airbag 40 to avoid blocking the blood flow and further promote blood discharge. Figure 2 In the process of moving in the cylinder 10 in the direction indicated by the middle arrow X1 to expand the volume of the first chamber 11 and reduce the volume of the second chamber 12, the gas in the first airbag 30 will move along Figure 2 The gas in the second chamber 12 is drawn into the first chamber 11 in the direction indicated by the middle arrow A2 to deflate the first airbag 30 and shrink the first airbag 30, thereby providing more space for cardiac ejection, reducing cardiac afterload, reducing myocardial oxygen consumption, and enhancing left ventricular ejection capacity. At the same time, the gas in the second chamber 12 is drawn into the first chamber 11 along the direction indicated by the middle arrow A2 to deflate the first airbag 30 and shrink the first airbag 30, thereby providing more space for cardiac ejection, reducing cardiac afterload, reducing myocardial oxygen consumption, and enhancing left ventricular ejection capacity. Figure 2 The second airbag 40 is injected in the direction indicated by the middle arrow B2 to inflate and expand the second airbag 40, so as to block the distal end of the aorta through the second airbag 40 to prevent the blood advancing at the distal end from flowing back when the first airbag 30 is deflated and contracted.

[0036] In this embodiment, Figure 1 and Figure 2 As shown, the power mechanism 50 includes: a drive unit 51 disposed on the outside of the cylinder 10, a sealed bearing 53 disposed on the cylinder 10, a driving shaft 52 connected to the sealed bearing 53 and extending axially into the cylinder 10 is constructed in the drive unit 51, and a coupling 54 for connecting the driving shaft 52 with the piston 20. The cylinder 10 is constructed with an end cover 13 with good airtightness, and the sealed bearing 53 is disposed on the end cover 13. The sealed bearing 53 is used to ensure the airtight isolation between the inside of the cylinder 10 and the external environment. In this embodiment, the cylinder 10 is preferably made of medical grade stainless steel material, and the inside of the cylinder 10 has a smooth inner wall to reduce the friction resistance of the piston 20 when the piston 20 moves. The piston 20 is preferably made of wear-resistant and low friction coefficient engineering plastics. The driving shaft 52 extends into the cylinder 10 through the sealed bearing 53 and is fixedly connected to the piston 20 through the coupling 54, so as to drive the piston 20 to reciprocate axially in the cylinder 10 through the driving shaft 52 of the drive unit 51.

[0037] In this embodiment, the airbag driven counterpulsation device 100 further includes: an airtightness detection sensor (not shown) for detecting the airtightness of the inner cavity of the cylinder 10. The airtightness detection sensor can accurately and timely evaluate the airtightness of the cylinder 10, and can promptly alarm once a small leak occurs in the cylinder 10 to prevent potential failures.

[0038] The circumferential inner wall of the cylinder 10 is provided with a wear-resistant coating 71. The wear-resistant coating 71 is applied to the circumferential inner wall of the cylinder 10 to improve the wear resistance of the inner wall of the cylinder 10 and resist the mechanical wear caused by the reciprocating motion of the piston 20. The wear-resistant coating 71 generally has a high hardness, good wear resistance and certain high temperature resistance, and effectively protects the inner wall of the cylinder 10 from direct wear.

[0039] In this embodiment, Figure 3 As shown, the circumferential surface of the piston 20 and / or the circumferential inner wall of the cylinder 10 are provided with a lubricating coating 72. The lubricating coating 72 may be applied on the wear-resistant coating 71 to reduce the friction coefficient between the piston 20 and the inner wall of the cylinder 10, reduce wear, and help dissipate heat. The lubricating coating 72 may also be applied on the circumferential surface of the piston 20 to enhance the lubrication performance between the piston 20 and the inner wall of the cylinder 10. The lubricating coating 72 generally has a low friction coefficient, good adhesion, and stable lubrication performance at operating temperature.

[0040] In this embodiment, Figure 4 As shown, at least one sealing ring 80 is disposed on the outer circumferential side of the piston 20. By disposing at least one sealing ring 80 between the outer circumferential side of the piston 20 and the inner wall of the cylinder 10, the air tightness of the inner cavity of the cylinder 10 is ensured when the piston 20 moves, gas leakage is prevented, and the wear between the piston 20 and the cylinder 10 is reduced. Preferably, the sealing ring 80 is made of a wear-resistant and high-temperature resistant material, such as a fluororubber material, and its cross-section is a lip-shaped structure to enhance the sealing effect.

[0041] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the utility model. They are not intended to limit the protection scope of the utility model. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the utility model should be included in the protection scope of the utility model.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An airbag driven counterpulsation device, characterized in that: include: A cylinder, a conduit connected to the cylinder, a piston disposed in the cylinder to separate the cylinder cavity into a first chamber and a second chamber with variable volumes, a first airbag and a second airbag disposed in the conduit and connected to the first chamber and the second chamber respectively, and a power mechanism driving the piston to reciprocate axially in the cylinder; The power mechanism drives the piston to reciprocate axially in the cylinder to alternately change the volumes of the first chamber and the second chamber, so as to drive the first airbag and the second airbag to expand and contract alternately.

2. The airbag driven counterpulsation device according to claim 1, characterized in that: The power mechanism drives the piston to move in the cylinder along a first direction to reduce the volume of the first chamber and expand the volume of the second chamber, so that the first airbag is expanded and the second airbag is contracted.

3. The airbag driven counterpulsation device according to claim 2, characterized in that: The power mechanism drives the piston to move in the cylinder along a second direction opposite to the first direction to expand the volume of the first chamber and reduce the volume of the second chamber, so that the first airbag is contracted and the second airbag is expanded.

4. The airbag driven counterpulsation device according to claim 1, characterized in that: The airbag-driven counterpulsation device also includes: a connecting tube arranged at the proximal end of the catheter, a first connecting tube arranged at the connecting tube and connected to the first chamber, a second connecting tube arranged at the connecting tube and connected to the second chamber, the first airbag and the second airbag are arranged successively front and back in the axial direction at the distal end of the catheter and are respectively connected to the first connecting tube and the second connecting tube, the first airbag formed at the distal end of the catheter is configured as a counterpulsation airbag, and the second airbag formed at the proximal end of the catheter is configured as a blocking balloon.

5. The airbag driven counterpulsation device according to claim 1, characterized in that: The power mechanism includes: a driving unit arranged outside the cylinder, a sealed bearing arranged on the cylinder, the driving unit is constructed with a driving shaft connected to the sealed bearing and extending axially into the cylinder, and a coupling for connecting the driving shaft with the piston.

6. The airbag driven counterpulsation device according to claim 1, characterized in that: The airbag driven counterpulsation device further comprises: an airtightness detection sensor for detecting the airtightness of the inner cavity of the cylinder.

7. The airbag driven counterpulsation device according to claim 1, characterized in that: The circumferential inner wall of the cylinder is provided with a wear-resistant coating.

8. The airbag driven counterpulsation device according to claim 1 or 7, characterized in that: The circumferential surface of the piston and / or the circumferential inner wall of the cylinder are provided with a lubricating coating.

9. The airbag driven counterpulsation device according to claim 1, characterized in that: At least one sealing ring is disposed on the circumferential outer side of the piston.

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