Left ventricular flexible assist device

Abstract

The present application relates to the field of assist devices and provides a left ventricular flexible assist device, wherein a catheter support of the device is arranged in a reflux catheter; a first opening is arranged at the top of the catheter support, a second opening is arranged at the bottom of the catheter support, and the side of the catheter support is a hollow structure; a trileaflet valve is fixedly connected to the inner side of the catheter support; a third opening is arranged at the top of the suction catheter, a fourth opening is arranged at the bottom of the reflux catheter, a fifth opening is arranged at the top of the reflux catheter, the third opening passes through the fourth opening and the second opening, and is fixedly connected to the bottom of the trileaflet valve; the support valve is arranged between the catheter support and the suction catheter; a blood discharge hole is arranged on the side of the reflux catheter, and a suction hole is arranged on the side of the suction catheter. The device provided by the present application can aspirate blood from the left ventricle during systole while avoiding the accidental aspiration of blood from the ascending aorta out of the body, and discharge blood into the ascending aorta during diastole while avoiding the accidental discharge of blood into the left ventricle.

Description

Technical Field

[0001] The present application relates to the technical field of assist devices, and in particular to a left ventricular flexible assist device. Background Art

[0002] Cardiogenic shock is a critical condition caused by various heart diseases, such as acute myocardial infarction and acute myocarditis, and is the most common cause of death in patients with heart disease. Interventional left ventricular assist devices (LVADs) directly drain blood from the left ventricle to the body, reducing cardiac workload, replacing ventricular work, increasing peripheral blood supply, and partially or completely replacing left ventricular ejection function. They are of great significance in the treatment of cardiogenic shock.

[0003] The functions of a left ventricular assist device include: 1. Pumping blood from the left ventricle during systole while preventing blood from being accidentally drawn out of the ascending aorta; 2. Discharging blood into the ascending aorta during diastole while preventing blood from being accidentally discharged into the left ventricle. Traditionally, a micro-turbine pump implanted in the left ventricle continuously pumps blood from the left ventricle into the ascending aorta while simultaneously discharging it into the peripheral circulation. This method continuously pumps blood out of the left ventricle and into the periphery during both systole and diastole, resulting in hemodynamically inconsistent horizontal blood flow, which can cause chronic damage to organs during use. Summary of the Invention

[0004] The present application provides a left ventricular flexible assist device to solve the problem that traditional assist devices continuously pump blood out of the left ventricle and discharge it into the periphery during both the systole and diastole of the heart, and its hemodynamic characteristics are horizontal blood flow that does not conform to the physiological state, which will cause chronic damage to the organ during use.

[0005] The present application provides a left ventricular flexible assist device, comprising: an aspiration catheter, a backflow catheter, a catheter stent, a stent valve, and a trileaflet valve;

[0006] The catheter support is arranged in the return conduit, and the bottom shape of the catheter support matches the shape of the inner wall of the return conduit, so that the bottom edge of the catheter support can surround and contact the inner wall of the return conduit;

[0007] The top of the catheter support is provided with a first opening, the bottom of the catheter support is provided with a second opening, the first opening and the second opening are interconnected, and the side surface of the catheter support is a hollow structure;

[0008] The tri-leaflet valve is fixedly connected to the inner side of the catheter support, and the one-way opening direction of the tri-leaflet valve is consistent with the direction from the second opening to the first opening;

[0009] The top of the suction conduit is provided with a third opening, the bottom of the return conduit is provided with a fourth opening, and the top of the return conduit is provided with a fifth opening. The third opening passes through the fourth opening and the second opening and is fixedly connected to the bottom of the trileaflet valve. The fifth opening is in communication with the first opening.

[0010] The stent valve is arranged between the catheter support and the suction catheter, and the area of ​​the stent valve matches the inner area of ​​the catheter support between the bottom of the trileaflet valve and the second opening;

[0011] A blood drainage hole is provided on a side of the reflux catheter located between the bottom of the catheter bracket and the fourth opening, and a suction hole is provided on a side of an end of the suction catheter away from the fourth opening.

[0012] In one embodiment, the return catheter is an expandable catheter, and the catheter support is a deformable support. The top and bottom of the catheter support can be deformed away from the central axis of the catheter support, so that the return catheter is expanded by the support force of the catheter support.

[0013] In one embodiment, the catheter support comprises: a first catheter sub-support, a second catheter sub-support and a connecting membrane;

[0014] The bottom of the first conduit sub-support is fixedly connected to the top of the connecting membrane, and the top of the second conduit sub-support is fixedly connected to the bottom of the connecting membrane. The top of the first conduit sub-support is provided with a first opening, and the bottom of the second conduit sub-support is provided with a second opening. The connecting membrane is a hollow structure, and the first opening, the connecting membrane and the second opening are interconnected. The first conduit sub-support and the second conduit sub-support both have side hollow structures.

[0015] The bottom shape of the second conduit sub-support matches the inner wall shape of the return conduit, so that the bottom edge of the second conduit sub-support can surround and contact the inner wall of the return conduit.

[0016] In one embodiment, the trileaflet valve includes a fixing ring and a trileaflet membrane flap, wherein the trileaflet membrane flap is fixedly connected to the inner side of the fixing ring, and the coverage area of ​​the trileaflet membrane flap within the fixing ring matches the inner circle area of ​​the fixing ring, so that the trileaflet valve can seal the inner circle of the fixing ring when it is closed.

[0017] In one embodiment, the fixing ring is fixedly connected to the inner side of the connecting membrane, and the one-way opening direction of the tri-leaflet valve is consistent with the direction from the second opening to the first opening.

[0018] In one embodiment, the stent-valve is disposed between the second catheter sub-stent and the suction catheter, and an area of ​​the stent-valve matches an inner area of ​​the second catheter sub-stent.

[0019] In one embodiment, a blood drainage hole is provided on a side of the return catheter located between the bottom of the second catheter sub-support and the fourth opening.

[0020] In one embodiment, the top edge of the first catheter sub-support, the bottom edge of the first catheter sub-support, the top edge of the second catheter sub-support, and the bottom edge of the second catheter sub-support are all wavy.

[0021] In one embodiment, three blood drainage holes are evenly distributed on the side of the return catheter between the bottom of the catheter support and the fourth opening.

[0022] In one embodiment, three suction holes are evenly distributed on a side surface of one end of the suction conduit away from the fourth opening.

[0023] The above one or more technical solutions in the embodiments of the present application have at least one of the following technical effects:

[0024] The left ventricular flexible assist device provided by the present application includes: a suction catheter, a reflow catheter, a catheter stent, a stent valve and a tri-leaflet valve; the catheter stent is arranged in the reflow catheter, and the bottom shape of the catheter stent matches the shape of the inner wall of the reflow catheter, so that the bottom edge of the catheter stent can surround and contact the inner wall of the reflow catheter; the top of the catheter stent is provided with a first opening, and the bottom of the catheter stent is provided with a second opening, the first opening and the second opening are interconnected, and the side of the catheter stent is a hollow structure; the tri-leaflet valve is fixedly connected to the inner side of the catheter stent, and the one-way opening direction of the tri-leaflet valve is consistent with the one-way opening direction from the second opening to the first opening The directions are consistent; a third opening is provided at the top of the suction catheter, a fourth opening is provided at the bottom of the return catheter, and a fifth opening is provided at the top of the return catheter. The third opening passes through the fourth opening and the second opening and is fixedly connected to the bottom of the trileaflet valve, and the fifth opening and the first opening are interconnected; the stent valve is provided between the catheter stent and the suction catheter, and the area of ​​the stent valve matches the inner side area of ​​the catheter stent between the bottom of the trileaflet valve and the second opening; a blood drainage hole is provided on the side of the return catheter between the bottom of the catheter stent and the fourth opening, and a suction hole is provided on the side of the end of the suction catheter away from the fourth opening.During use, since the device is made of flexible material, each catheter can be bent, the blood drainage hole is placed in the ascending aorta, and the suction hole is placed in the left ventricle. When the heart contracts, the suction force of the suction catheter is used to draw blood from the left ventricle. The blood flows from the suction hole along the suction catheter to the third opening, breaks open the trileaflet valve, and is discharged from the body along the first opening and the fifth opening. At this time, due to the high-speed movement of the blood in the suction catheter, the suction catheter vibrates, and the vibration is transmitted to the stent valve between the catheter stent and the suction catheter, causing the stent valve to move away from the central axis of the suction catheter until it is completely fitted to the inner side of the catheter stent between the bottom of the trileaflet valve and the second opening, completely closing the side hollow part of the catheter stent between the bottom of the trileaflet valve and the second opening. Since the bottom shape of the catheter stent matches the shape of the inner wall of the reflux duct, the bottom edge of the catheter stent can surround and contact the inner wall of the reflux duct. Therefore, at this time, the blood drainage hole is blocked by the stent valve, the outer wall of the suction catheter and the inner wall of the reflux duct, and blood flowing into the blood drainage hole from the ascending aorta cannot is sucked out of the body; during diastole, blood enters the return duct from the fifth opening and the first opening, and as the amount of blood in the return duct increases, the blood passes through the hollow part of the catheter stent and forms a force on the stent valve to move toward the central axis of the suction duct. At this time, the stent valve and the inner side of the catheter stent between the bottom of the trileaflet valve and the second opening are no longer in contact, thereby forming a gap between the inner side of the catheter stent between the bottom of the trileaflet valve and the second opening and the stent valve. The blood in the return duct flows from the gap to the blood drainage hole and then into the ascending aorta. At the same time, since the direction of the one-way opening of the trileaflet valve is consistent with the direction from the second opening to the first opening, the trileaflet valve is in a closed state at this time, and blood cannot flow through the trileaflet valve to the suction duct, and also cannot flow into the left ventricle from the suction hole, thereby achieving the purpose of sucking blood from the left ventricle during systole while avoiding the accidental suction of blood from the ascending aorta out of the body, and discharging blood into the ascending aorta during diastole while avoiding the accidental discharge of blood into the left ventricle, thereby preventing chronic damage to organs during use of the device.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present application or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0027] Figure 1 is a schematic structural diagram of a left ventricular flexible assist device provided in an embodiment of the present application;

[0028] Figure 2 This is one of the partial structural diagrams of the left ventricular flexible assist device provided in an embodiment of the present application;

[0029] Figure 3 This is the second partial structural diagram of the left ventricular flexible assist device provided in an embodiment of the present application;

[0030] Figure 4 Schematic diagram of the trileaflet valve structure of the left ventricular flexible assist device provided in an embodiment of the present application.

[0031] Reference numerals:

[0032] 1-suction catheter; 11-suction hole; 2-reflux catheter; 21-fourth opening; 22-fifth opening; 23-blood drainage hole; 3-catheter bracket; 31-first opening; 32-second opening; 33-first catheter sub-branch; 34-second catheter sub-branch; 35-connecting membrane; 4-branch valve; 5-trileaflet valve; 51-fixing ring; 52-trileaflet membrane valve. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0034] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0036] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0038] Figure 1 is a schematic structural diagram of a left ventricular flexible assist device provided in an embodiment of the present application;

[0039] Figure 2 This is one of the partial structural diagrams of the left ventricular flexible assist device provided in an embodiment of the present application;

[0040] Figure 3 This is the second partial structural diagram of the left ventricular flexible assist device provided in an embodiment of the present application;

[0041] Figure 4 1 is a schematic diagram of the trileaflet valve structure of the left ventricular flexible assist device provided in an embodiment of the present application;

[0042] Reference Figure 1-4, the present application provides a left ventricular flexible assist device, comprising: an aspiration catheter 1, a backflow catheter 2, a catheter stent 3, a stent valve 4 and a trileaflet valve 5;

[0043] The catheter support 3 is disposed in the return catheter 2. The bottom shape of the catheter support 3 matches the inner wall shape of the return catheter 2, so that the bottom edge of the catheter support 3 can surround and contact the inner wall of the return catheter 2.

[0044] The top of the catheter support 3 is provided with a first opening 31, and the bottom of the catheter support 3 is provided with a second opening 32. The first opening 31 and the second opening 32 are interconnected, and the side surface of the catheter support 2 is a hollow structure;

[0045] The tri-leaflet valve 5 is fixedly connected to the inner side of the catheter support 3, and the one-way opening direction of the tri-leaflet valve 5 is consistent with the direction from the second opening 32 to the first opening 31;

[0046] A third opening is provided at the top of the suction catheter 1, a fourth opening 21 is provided at the bottom of the return catheter 2, and a fifth opening 22 is provided at the top of the return catheter 2. The third opening passes through the fourth opening 21 and the second opening 32 and is fixedly connected to the bottom of the trileaflet valve 5. The fifth opening 22 and the first opening 31 are interconnected.

[0047] The stent valve 4 is disposed between the catheter support 3 and the suction catheter 1 , and the area of ​​the stent valve 4 matches the inner area of ​​the catheter support 3 between the bottom of the trileaflet valve 5 and the second opening 32 ;

[0048] A blood discharge hole 23 is provided on the side of the reflux catheter 2 between the bottom of the catheter support 3 and the fourth opening 21 , and a suction hole 11 is provided on the side of one end of the suction catheter 1 away from the fourth opening 21 .

[0049] When the left ventricular flexible assist device is in use, since the device is made of flexible material, each catheter can be bent, the blood discharge hole 23 is placed in the ascending aorta, and the suction hole 11 is placed in the left ventricle. When the heart contracts, the suction force of the suction catheter 1 is used to suck blood from the left ventricle. The blood flows from the suction hole 11 along the suction catheter 1 to the third opening, breaks open the trileaflet valve 5, and is discharged from the body along the first opening 31 and the fifth opening 22. At this time, due to the high-speed movement of the blood in the suction catheter 1, the suction catheter 1 vibrates, and the vibration is transmitted to the catheter support 3 and the support between the suction catheter 1. The valve 4 causes the stent valve 4 to move in a direction away from the central axis of the suction catheter 1 until it is completely fitted on the inner side of the catheter stent 3 between the bottom of the trileaflet valve 5 and the second opening 32, and the side hollow portion of the catheter stent 3 between the bottom of the trileaflet valve 5 and the second opening 32 is completely closed. Since the bottom shape of the catheter stent 3 matches the shape of the inner wall of the reflux catheter 2, the bottom edge of the catheter stent 3 can surround and contact the inner wall of the reflux catheter 2. Therefore, at this time, the blood discharge hole 23 is closed by the stent valve 4, the outer wall of the suction catheter 1 and the inner wall of the reflux catheter 2. , the blood flowing into the blood drainage hole 23 from the ascending aorta cannot be sucked out of the body; when the heart is in diastole, the blood enters the return duct 2 from the fifth opening 22 and the first opening 31, and as the amount of blood in the return duct 2 increases, the blood passes through the hollow part of the catheter stent 3 to form a force on the stent valve 4 to move toward the central axis of the suction catheter 1. At this time, the stent valve 4 and the inner side of the catheter stent 3 between the bottom of the trileaflet valve 5 and the second opening 32 are no longer in contact with each other, so that a blood flow is formed between the inner side of the catheter stent 3 between the bottom of the trileaflet valve 5 and the second opening 32 and the stent valve 4. The blood in the reflux catheter 2 flows from the gap to the blood discharge hole 23, and then flows into the ascending aorta. At the same time, since the one-way opening direction of the trileaflet valve 5 is consistent with the direction from the second opening 32 to the first opening 31, the trileaflet valve 5 is in a closed state at this time, and the blood cannot flow to the suction catheter 1 through the trileaflet valve 5, and cannot flow into the left ventricle from the suction hole 11, so as to achieve the purpose of sucking blood from the left ventricle during the heart's contraction period, while avoiding the ascending aorta blood from being accidentally sucked out of the body, and discharging the blood into the ascending aorta during the heart's diastole, while avoiding the blood from being accidentally discharged into the left ventricle.

[0050] This embodiment, by providing a suction catheter, a reflux catheter, a catheter stent, a stent valve and a trileaflet valve, can achieve the purpose of sucking blood from the left ventricle during cardiac systole while avoiding the accidental suction of blood from the ascending aorta out of the body, and discharge blood into the ascending aorta during cardiac diastole while avoiding the accidental discharge of blood into the left ventricle, thereby preventing chronic damage to organs during the use of the device.

[0051] Reference Figure 1-4In one embodiment, the reflux catheter 2 is an expandable catheter, and the catheter support 3 is a deformable support. The top and bottom of the catheter support 3 can be deformed away from the central axis of the catheter support 3, so that the reflux catheter 2 is expanded by the support force of the catheter support 3.

[0052] The deformation of the catheter support 3 causes it to expand into a funnel shape from the connection to the trileaflet valve 5 to the top, and then from the connection to the trileaflet valve 5 to the bottom. At this point, the trileaflet valve 5 is also expanded by the force of expansion. The expanded regurgitant catheter 2 can be fusiform or any other shape, not limited herein. The expansion of the regurgitant catheter 2 provides more space for the trileaflet valve 5 as it expands, providing a sufficient valve orifice area (i.e., the opening area of ​​the trileaflet valve 52 when the trileaflet valve 5 is open) to ensure the required blood aspiration volume.

[0053] It should be noted that, in this embodiment, since the trileaflet valve 5 is made of a deformable flexible material and the trileaflet membrane flap 52 is designed with a surplus area, its one-way opening performance will not be affected when the trileaflet valve 5 is expanded. In addition, the stent valve 4 is also made of a deformable flexible material and is designed with a surplus area. When the inner side area of ​​the catheter stent 3 between the bottom of the trileaflet valve 5 and the second opening 32 changes due to deformation, it will not affect the sealing performance of the stent valve 4 on the side hollow portion of the catheter stent 3 between the bottom of the trileaflet valve 5 and the second opening 32.

[0054] In this example, the reflux catheter is designed to be an expandable catheter and the catheter stent is designed to be a deformable stent, which can provide a larger space for the trileaflet valve when it expands, so that it has a sufficient valve orifice area to ensure the required blood volume.

[0055] Reference Figure 1-4 In one embodiment, the catheter support 3 includes: a first catheter sub-support 33, a second catheter sub-support 34 and a connecting membrane 35; the bottom of the first catheter sub-support 33 is fixedly connected to the top of the connecting membrane 35, and the top of the second catheter sub-support 34 is fixedly connected to the bottom of the connecting membrane 35. The top of the first catheter sub-support 33 is provided with a first opening 31, and the bottom of the second catheter sub-support 34 is provided with a second opening 32. The connecting membrane 35 is a hollow structure, and the first opening 31, the connecting membrane 35 and the second opening 32 are interconnected. The first catheter sub-support 33 and the second catheter support 34 both have side hollow structures; the bottom shape of the second catheter sub-support 34 matches the shape of the inner wall of the return catheter 2, so that the bottom edge of the second catheter sub-support 34 can surround and contact the inner wall of the return catheter 2.

[0056] The trifoliate valve 5 includes a fixing ring 51 and a trifoliate membrane flap 52. The trifoliate membrane flap 52 is fixedly connected to the inner side of the fixing ring 51, and the coverage area of ​​the trifoliate membrane flap 52 in the fixing ring 51 matches the inner circle area of ​​the fixing ring 51, so that the trifoliate valve 5 can seal the inner circle of the fixing ring 51 when it is closed.

[0057] It should be noted that the arrangement of the three-leaf membrane flap 52 in the fixed ring 51 is not limited here. They may have overlapping surfaces with each other or not. In this embodiment, the three-leaf membrane flap 52 is fixed tightly to the inner side of the fixed ring 51 in sequence, without overlapping surfaces with each other, and one side of each membrane flap is fixed to the inner side of the fixed ring 51, and the other sides are free and fit with the adjacent membrane flaps. When blood flows through, the free edge of the three-leaf membrane flap 52 can be unidirectionally opened, thereby passing through the three-leaf membrane flap 5. At the same time, after the blood flows through, the three-leaf membrane flap 52 fits together again to close the three-leaf valve 5, and the blood flowing in the opposite direction cannot pass through.

[0058] The fixing ring 51 is fixedly connected to the inner side of the connecting membrane 35 , and the one-way opening direction of the tri-leaflet valve 5 is consistent with the direction from the second opening 32 to the first opening 31 .

[0059] Furthermore, the stent valve 4 is arranged between the second catheter sub-stent 34 and the suction catheter 2, and the area of ​​the stent valve 4 matches the inner area of ​​the second catheter sub-stent 34. A blood drainage hole 23 is provided on the side of the reflux catheter 2 between the bottom of the second catheter sub-stent 34 and the fourth opening 21.

[0060] In this embodiment, the catheter stent is divided into a first catheter sub-stent and a second catheter sub-stent, and a connecting membrane is connected between the first catheter sub-stent and the second catheter sub-stent, and the trileaflet valve is arranged in the connecting membrane. On the one hand, when the catheter stent is deformed, the two smaller parts, namely the first catheter sub-stent and the second catheter sub-stent, complete the deformation respectively. Since small-volume stents are easier to deform, this design is conducive to the overall deformation of the catheter stent. On the other hand, the first catheter sub-stent and the second catheter stent will also generate a force on the connecting membrane when deformed, and the connecting membrane will further generate a force on the trileaflet valve. Therefore, connecting the trileaflet valve in the connecting membrane does not hinder the expansion of the trileaflet valve.

[0061] Reference Figure 1-4 In one embodiment, the top edge of the first conduit sub-support 33 , the bottom edge of the first conduit sub-support 33 , the top edge of the second conduit sub-support 34 , and the bottom edge of the second conduit sub-support 34 are all wavy.

[0062] The wavy design can weaken the support structure. Compared with a simple straight-line design, it can make the support easier to expand and contract under force and more prone to deformation.

[0063] In this embodiment, the top edge of the first conduit sub-support, the bottom edge of the first conduit sub-support, the top edge of the second conduit sub-support and the bottom edge of the second conduit sub-support are designed to be wavy, so that the entire support is easier to deform.

[0064] Reference Figure 1 In one embodiment, three blood drainage holes 23 are evenly distributed on the side of the reflux catheter 2 between the bottom of the catheter support 3 and the fourth opening 21.

[0065] It should be noted that the specific number, shape and specific distribution state of the blood drainage holes 23 are not limited here and can be adjusted according to needs. In this embodiment, three blood drainage holes 23 are evenly distributed on the side of the return catheter 2 between the bottom of the catheter bracket 3 and the fourth opening 21, which can meet the requirements of uniform blood drainage volume, blood drainage speed and blood drainage direction.

[0066] In this embodiment, three blood drainage holes are evenly distributed on the side of the return conduit between the bottom of the conduit support and the fourth opening, so that the design of the blood drainage holes meets the requirements of blood drainage volume, blood drainage speed and uniform blood drainage direction.

[0067] Reference Figure 1 In one embodiment, three suction holes 11 are evenly distributed on the side surface of the end of the suction tube 1 away from the fourth opening 21 .

[0068] It should be noted that the specific number, shape and specific distribution of the suction holes 11 are not limited here and can be adjusted according to needs. In this embodiment, three suction holes 11 are evenly distributed on the side of the end of the suction tube 1 away from the fourth opening 21, which can meet the requirements of uniform suction volume, suction speed and suction direction.

[0069] In this embodiment, three suction holes are evenly distributed on the side surface of the end of the suction conduit away from the fourth opening, so that the design of the suction holes meets the requirements of suction volume, suction speed and uniform suction direction.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A left ventricular flexible assist device, characterized in that: include: aspiration catheters, reflux catheters, catheter-mounted stents, stent-valve valves, and trileaflet valves; The catheter support is arranged in the return conduit, and the bottom shape of the catheter support matches the shape of the inner wall of the return conduit, so that the bottom edge of the catheter support can surround and contact the inner wall of the return conduit; The top of the catheter support is provided with a first opening, the bottom of the catheter support is provided with a second opening, the first opening and the second opening are interconnected, and the side surface of the catheter support is a hollow structure; The tri-leaflet valve is fixedly connected to the inner side of the catheter support, and the one-way opening direction of the tri-leaflet valve is consistent with the direction from the second opening to the first opening; The top of the suction conduit is provided with a third opening, the bottom of the return conduit is provided with a fourth opening, and the top of the return conduit is provided with a fifth opening. The third opening passes through the fourth opening and the second opening and is fixedly connected to the bottom of the trileaflet valve. The fifth opening is in communication with the first opening. The stent valve is arranged between the catheter support and the suction catheter, and the area of ​​the stent valve matches the inner area of ​​the catheter support between the bottom of the trileaflet valve and the second opening; A blood drainage hole is provided on the side of the reflux catheter between the bottom of the catheter bracket and the fourth opening, and a suction hole is provided on the side of the end of the suction catheter away from the fourth opening; The suction catheter, the reflux catheter, the catheter stent, the stent valve and the trileaflet valve are used to draw blood from the left ventricle during cardiac systole while avoiding the accidental aspiration of blood from the ascending aorta out of the body, and to discharge blood into the ascending aorta during cardiac diastole while avoiding the accidental discharge of blood into the left ventricle.

2. The left ventricular flexible assist device according to claim 1, characterized in that: The return catheter is an expandable catheter, and the catheter support is a deformable support. The top and bottom of the catheter support can be deformed away from the central axis of the catheter support, so that the return catheter is expanded by the support force of the catheter support.

3. The left ventricular flexible assist device according to claim 1, characterized in that: The catheter support comprises: a first catheter sub-support, a second catheter sub-support and a connecting membrane; The bottom of the first conduit sub-support is fixedly connected to the top of the connecting membrane, and the top of the second conduit sub-support is fixedly connected to the bottom of the connecting membrane. The top of the first conduit sub-support is provided with a first opening, and the bottom of the second conduit sub-support is provided with a second opening. The connecting membrane is a hollow structure, and the first opening, the connecting membrane and the second opening are interconnected. The first conduit sub-support and the second conduit sub-support both have side hollow structures. The bottom shape of the second conduit sub-support matches the inner wall shape of the return conduit, so that the bottom edge of the second conduit sub-support can surround and contact the inner wall of the return conduit.

4. The left ventricular flexible assist device according to claim 3, characterized in that: The trifoliate valve includes a fixing ring and a trifoliate membrane flap, wherein the trifoliate membrane flap is fixedly connected to the inner side of the fixing ring, and the coverage area of ​​the trifoliate membrane flap within the fixing ring matches the inner circle area of ​​the fixing ring, so that the inner circle of the fixing ring can be sealed when the trifoliate valve is closed.

5. The left ventricular flexible assist device according to claim 4, characterized in that: The fixing ring is fixedly connected to the inner side of the connecting membrane, and the one-way opening direction of the tri-leaflet valve is consistent with the direction from the second opening to the first opening.

6. The left ventricular flexible assist device according to claim 3, characterized in that: The stent-valve is arranged between the second catheter sub-stent and the suction catheter, and the area of ​​the stent-valve matches the inner side area of ​​the second catheter sub-stent.

7. The left ventricular flexible assist device according to claim 3, characterized in that: A blood drainage hole is provided on a side of the reflux catheter located between the bottom of the second catheter sub-support and the fourth opening.

8. The left ventricular flexible assist device according to claim 3, characterized in that: A top edge of the first conduit sub-support, a bottom edge of the first conduit sub-support, a top edge of the second conduit sub-support, and a bottom edge of the second conduit sub-support are all wavy.

9. The left ventricular flexible assist device according to claim 1, characterized in that: The side surface of the reflux conduit between the bottom of the conduit support and the fourth opening is evenly distributed with three blood drainage holes.

10. The left ventricular flexible assist device according to claim 1, characterized in that: Three suction holes are evenly distributed on the side surface of one end of the suction conduit away from the fourth opening.

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