Foldable stent and foldable catheter pump
By setting the inner membrane and outer membrane on the foldable stent of the interventional catheter pump to form a smooth surface, the problems of blood damage and thrombosis at high speed are solved, and the performance of the equipment is improved.
Patent Information
- Application Number
- CN202421881279.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-05
AI Technical Summary
The foldable impeller of the existing interventional catheter pumps causes non-physiological shear and collision of the blood when it runs at high speed, resulting in complications such as hemolysis and thrombosis.
A foldable stent is designed to reduce the risk of blood damage and thrombosis by providing an inner membrane and an outer membrane on the inner and outer walls of the stent body, respectively, so that it forms a smooth inner and outer surface after expansion.
The use performance of the foldable catheter pump is improved through the smooth inner and outer surfaces.
Smart Images
Figure CN222942506U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of medical devices, and in particular to a foldable stent and a foldable catheter pump. Background Art
[0002] In recent years, mechanical circulatory assistance has become an important way to treat cardiovascular critical illnesses such as end-stage heart failure and cardiogenic shock, and it has played an important role in improving patients' hemodynamics. Through mechanical circulatory assistance therapy, part of the patient's heart's pumping function is replaced by a mechanical circulatory assistance device, and the heart is effectively rested, which is conducive to the functional recovery of the patient's failing heart. Mechanical circulatory assist devices include intra-aortic balloon counterpulsation, extracorporeal membrane oxygenation, implantable left ventricular assist device, and interventional catheter pump.
[0003] Compared with other mechanical circulatory assist devices, interventional catheter pumps are less invasive and easier to implant, and have good therapeutic effects on high-risk patients, such as those with severe cardiogenic shock. However, due to its small diameter (e.g., 6 mm), in order to provide a mechanical circulatory assist flow that meets clinical needs (e.g., 1 L / min at 40-60 mmHg), the foldable impeller of the catheter pump often needs to run at a higher speed (e.g., 10,000-60,000 rpm). The local rapid changes in the flow field caused by such a high speed will exert great non-physiological shear, collision and other destructive effects on the blood, leading to complications such as hemolysis and even thrombosis, posing a great life safety hazard to patients.
[0004] In the above background, the variable diameter foldable impeller has effectively solved the contradiction between the interventional size and the clinical circulation auxiliary flow demand. The variable diameter foldable impeller necessarily requires a variable diameter foldable impeller chamber to constrain the fluid. The current common implementation method is to use a deformable superelastic alloy stent and cover it with a film.
[0005] However, the variable diameter foldable impeller chamber currently used will inevitably have problems such as mechanical damage and rupture of red blood cells due to excessively fast blood flow or the rough inner wall of the foldable impeller chamber, and platelets agglomerating on the surface of the stent to form thrombi when the foldable impeller is in operation.
[0006] Therefore, in order to further eliminate the above-mentioned disadvantages and improve the use of the variable diameter foldable impeller, the variable diameter foldable impeller chamber must be continuously improved. Utility Model Content
[0007] The purpose of the present application is to provide a foldable stent and a foldable catheter pump, which reduce the damage to blood and make it difficult for blood to gather on the surface of the foldable stent to form thrombus, thereby improving the performance of the foldable catheter pump.
[0008] The technical solutions provided by this application are as follows:
[0009] A foldable bracket, comprising:
[0010] The stent body is cylindrical and has a plurality of stent holes, which are suitable for the stent body to expand or contract along its radial direction;
[0011] An inner membrane is arranged on the inner wall of the stent body;
[0012] An outer membrane, disposed on the outer side wall of the stent body;
[0013] The inner film and the outer film are at least partially connected, and the distal end of the inner film and the distal end of the outer film are sealingly connected.
[0014] In some embodiments, the inner membrane is fixed to the stent body only at its distal end, and the outer membrane is fixed to the stent body only at its distal end, and a movable space for the stent body to move is formed between the inner membrane and the outer membrane.
[0015] In some embodiments, a plurality of connection points are provided between the inner membrane and the outer membrane, wherein the connection points are located in the stent holes and are at a preset distance from the stent hole walls, and the inner membrane and the outer membrane are connected and fixed at the connection points.
[0016] In some embodiments, the connection point has a thickness in the radial direction of the stent body, and the thickness of the connection point is consistent with the radial thickness of the stent body; and / or, at least two connection points are provided in a stent hole.
[0017] In some embodiments, the shortest axial distance between the connection point and the stent hole wall is greater than the movement distance of the stent body relative to the inner membrane or relative to the outer membrane when the stent body expands or contracts along its own radial direction.
[0018] In some embodiments, the stent body has a first diameter after expansion, and has a second diameter after contraction;
[0019] The shortest distance between the connection point and the wall of the stent hole in the axial direction is 0.15-0.9 times the difference between the first diameter and the second diameter.
[0020] In some embodiments, the stent body has a first diameter after expansion, and after the stent body is expanded, the inner membrane and the outer membrane are tensioned;
[0021] The inner diameter of the outer membrane after being stretched is smaller than or equal to the first diameter, and / or the outer diameter of the inner membrane after being stretched is smaller than or equal to the first diameter.
[0022] In some embodiments, the stent body includes a distal connection segment, a main segment, and a proximal connection segment connected in sequence, the distal connection segment is a conical structure that shrinks from the main segment toward the distal end, and the proximal connection segment is a conical structure that shrinks from the main segment toward the proximal end;
[0023] The main body section is suitable for accommodating a foldable impeller, and the inner membrane and the outer membrane are both arranged at the main body section.
[0024] In some embodiments, the bracket hole is in a diamond shape, the bracket body is in a mesh structure, and the bracket body forms a connecting edge between two adjacent bracket holes;
[0025] The connecting edge includes a first connecting segment and a second connecting segment, wherein the angle between the first connecting segment and the axis of the bracket body is smaller than the angle between the second connecting segment and the axis of the bracket body;
[0026] The distal ends of the inner membrane and the outer membrane are both fixed to the first connecting section located at the distal end of the main body section.
[0027] The present application also provides a foldable catheter pump, comprising:
[0028] The foldable impeller and the foldable bracket provided in any one of the above embodiments, wherein the foldable impeller is suitable for being inserted into the foldable bracket.
[0029] The technical effects of this application are:
[0030] 1. In the present application, an inner membrane and an outer membrane are respectively provided on the inner and outer walls of the stent body, so that the foldable stent can have a smooth inner and outer surface after being fully expanded. On the one hand, it can reduce the blood damage caused by the rough inner wall of the foldable stent; on the other hand, the smooth inner and outer surfaces are less likely to cause blood flow aggregation, effectively reducing the formation of thrombus. In addition, the present application also seals and connects the distal end of the inner membrane and the distal end of the outer membrane, so that when blood flows into the interior of the foldable stent through the distal end, it will not accidentally flow into the area between the inner membrane and the outer membrane, avoiding blood flow aggregation between the inner membrane and the outer membrane, further reducing the risk of thrombosis.
[0031] 2. In the present application, only the distal ends of the inner membrane and the outer membrane are connected to the stent body, and the rest of the parts are not connected to the stent body, so that the inner membrane and the outer membrane can move freely during the expansion and contraction of the stent body, and will not interfere with the stent body and thus affect the expansion and contraction of the stent body. At the same time, there are several connection points between the inner membrane and the outer membrane, which are located in the stent hole and have a preset distance from the stent hole wall, so that although the inner membrane is only connected to the stent body at the distal end, it can also be tensioned under the drive of the outer membrane. That is, when the outer membrane is gradually tensioned during the expansion of the stent body, the inner membrane is affected by the outer membrane and is also gradually tensioned until a smooth inner surface is formed. The structural setting is more reasonable and practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The present application is further described in detail below with reference to the accompanying drawings and specific implementation methods:
[0033] Figure 1 is a schematic diagram of the three-dimensional structure of a bracket body provided in one embodiment of the present application;
[0034] Figure 2 is a schematic diagram of the three-dimensional structure of a foldable bracket provided in one embodiment of the present application;
[0035] Figure 3 is a partial enlarged cross-sectional view of a foldable bracket provided in one embodiment of the present application;
[0036] Figure 4 It is a partial view of a bracket body provided in one embodiment of the present application.
[0037] Description of Figure Numbers:
[0038] 100, stent body; 110, stent hole; 120, distal connection segment; 130, main segment; 140, proximal connection segment; 150, connection edge; 151, first connection segment; 152, second connection segment; 160, node;
[0039] 200, endometrium;
[0040] 300, outer membrane;
[0041] 400, activity space;
[0042] 500. Connection point. DETAILED DESCRIPTION
[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.
[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.
[0045] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".
[0046] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.
[0047] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0048] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various components of the present application are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, the indications of these directions also change accordingly.
[0049] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0050] In the embodiments of the present application, "proximal end" refers to the end of the associated object that is close to the operator;
[0051] "Distal end" refers to the end of the associated object that is away from the operator. "Proximal end" and "distal end" refer to the position or direction of the associated object (e.g., a component of a medical device) relative to the operator (e.g., a doctor) who uses the device (e.g., a medical device) on which the associated object is located. For example, "proximal end" refers to the end that is closer to the doctor during the doctor's normal operation of the medical device, while "distal end" refers to the end that is away from the doctor during the doctor's normal operation of the medical device, that is, the end that enters the patient's body first.
[0052] According to a specific embodiment provided by this application, see Figures 1 to 3 A foldable stent includes a stent body 100, an inner membrane 200 and an outer membrane 300. The stent body 100 is cylindrical, and the interior is suitable for accommodating a foldable impeller. The stent body 100 is preferably made of a superelastic material, such as a shape memory material such as nickel-titanium alloy, and has a strong elastic deformation ability, which can realize the radial expansion or contraction of the stent body 100 for use with a foldable impeller. The inner membrane 200 is arranged on the inner side wall of the stent body 100, and the outer membrane 300 is arranged on the outer side wall of the stent body 100, and the inner membrane 200 and the outer membrane 300 are at least partially connected. As the stent body 100 expands and contracts, the inner membrane 200 and the outer membrane 300 arranged on the inner side wall and the outer side wall of the stent body 100 will also be tensioned or relaxed together. When the stent body 100 is fully expanded, the inner membrane 200 and the outer membrane 300 are stretched to form smooth surfaces on the inner and outer walls of the stent body 100, so that the foldable stent can have smooth inner and outer surfaces after full expansion. On the one hand, it can reduce the blood damage caused by the rough inner wall of the foldable stent; on the other hand, the smooth inner and outer surfaces are less likely to cause blood flow aggregation, effectively reducing the formation of thrombus.
[0053] In actual use, blood flows into the distal end of the foldable stent through the pumping of the foldable impeller and flows out from the proximal end of the foldable stent. In order to prevent the blood flow from accidentally entering the area between the inner membrane 200 and the outer membrane 300 during the flow, the distal end of the inner membrane 200 and the distal end of the outer membrane 300 are preferably sealed and connected, which can prevent the blood flow from gathering between the inner membrane 200 and the outer membrane 300, further reducing the risk of thrombosis. At this time, because the stent body 100 is located between the inner membrane 200 and the outer membrane 300, when the inner membrane 200 and the outer membrane 300 are sealed and connected, the corresponding part of the stent body 100 will also be fixedly connected with the inner membrane 200 and the outer membrane 300. Specifically, the distal end of the inner membrane 200 and the distal end of the outer membrane 300 can be fixed by gluing, hot melting, etc., which is not limited here and is within the protection scope of the present application.
[0054] In a specific embodiment, a plurality of bracket holes 110 are provided on the bracket body 100, which can improve the deformation ability of the bracket body 100 and allow the bracket body 100 to expand or contract along its own radial direction. Specifically, when the bracket body 100 is not subjected to external force, it is in an expanded state. When the bracket body 100 is subjected to external force, the bracket hole 110 is compressed and deformed, and the size of the bracket hole 110 in the circumferential direction of the bracket body 100 becomes smaller, and the size in the axial direction of the bracket body 100 becomes larger, thereby achieving the contraction of the bracket body 100. Among them, the bracket hole 110 is preferably a diamond hole, which has a stronger deformation ability.
[0055] In practical applications, there are generally two ways to expand and contract the stent body 100. One is that the stent body 100 expands to a target size in a natural state (a state when not acted upon by an external force), and the stent body 100 is compressed by an external force, thereby achieving the contraction of the stent body 100; the other is that the stent body 100 contracts in a natural state, and when expansion is required, the stent body 100 is expanded to a target size by an external force. The present embodiment preferably adopts the former, that is, the stent body 100 expands in a natural state and contracts after being acted upon by an external force.
[0056] Specifically, see Figure 1 and Figure 2 The stent body 100 includes a distal connection section 120, a main section 130 and a proximal connection section 140 connected in sequence. The distal connection section 120 is a conical structure that shrinks from the main section 130 toward the distal end, and the proximal connection section 140 is a conical structure that shrinks from the main section 130 toward the proximal end. Among them, the main section 130 has the largest inner diameter, which is suitable for accommodating a foldable impeller and can provide a running space for the foldable impeller. At this time, the inner membrane 200 and the outer membrane 300 are preferably arranged at the main section 130 of the stent body 100; and the distal connection section 120 and the proximal connection section 140 located at both ends of the main section 130 can provide the stent body 100 with a fixing point for connecting it with other components (such as a catheter, etc.).
[0057] In a preferred embodiment, only the distal ends of the inner membrane 200 and the outer membrane 300 are fixed to the stent body 100, that is, only the sealed connection parts of the inner membrane 200 and the outer membrane 300 are connected to the stent body 100, and the rest of the parts are not connected to the stent body 100. In this way, the inner membrane 200 and the outer membrane 300 can move freely relative to the stent body 100 during the expansion and contraction of the stent body 100, and will not interfere with the stent body 100 and thus affect the expansion and contraction of the stent body 100, providing sufficient activity space 400 for the activities of the stent body 100, further improving the deformation capacity of the foldable stent.
[0058] Further, see Figure 1 , Figure 3 and Figure 4 , the bracket body 100 is made of a thin-walled metal tube by cutting and heat treatment, and the metal tube is cut to form the above-mentioned plurality of bracket holes 110. At this time, the bracket body 100 is in a mesh structure, and the bracket body 100 forms a connecting edge 150 between two adjacent bracket holes 110, and each two connected connecting edges 150 are provided with a node 160. The bracket hole 110 is in a rhombus shape, and each four connecting edges 150 connected end to end can be surrounded to form an edge contour of a bracket hole 110. Among them, the connecting edge 150 can specifically include a first connecting segment 151 and a second connecting segment 152, and the angle between the first connecting segment 151 and the axis of the bracket body 100 is smaller than the angle between the second connecting segment 152 and the axis of the bracket body 100. When the bracket hole 110 is deformed due to the expansion and contraction of the bracket body 100, the deformation capacity of the bracket hole 110 near the first connecting segment 151 is smaller than the deformation capacity near the second connecting segment 152, and the axial movement generated during deformation is smaller. In order to further reduce the resistance of the inner membrane 200 and the outer membrane 300 to the expansion and contraction of the stent body 100, the distal end of the inner membrane 200 and the distal end of the outer membrane 300 are preferably fixed at the first connecting section 151 located at the distal end of the main segment 130, that is, the distal end of the inner membrane 200 and the distal end of the outer membrane 300 are fixed to a small deformation area near the distal node 160 of the main segment 130.
[0059] Specifically, see Figure 3 , a number of connection points 500 are provided between the inner membrane 200 and the outer membrane 300, the connection points 500 are located in the stent hole 110 and are at a preset distance from the wall of the stent hole 110, and the inner membrane 200 and the outer membrane 300 are connected and fixed at the connection points 500. Among them, the inner membrane 200 and the outer membrane 300 can be fixed at the electrical contact point by gluing, hot melting or the like. In this way, the inner membrane 200 can be tensioned and relaxed as the stent body 100 expands and contracts even when only the distal end is connected to the stent body 100. That is, when the outer membrane 300 is gradually tensioned during the expansion process of the stent body 100, the inner membrane 200 is pulled by the outer membrane 300 and is also gradually tensioned until a smooth inner surface is formed. Moreover, the connection point 500 is located in the stent hole 110 and has a preset distance from the hole wall of the stent hole 110. While achieving the connection between the inner membrane 200 and the outer membrane 300, the movable space 400 of the stent body 100 can be guaranteed as much as possible. The structural setting is more reasonable and practical.
[0060] Preferably, the connection points 500 should have a thickness in the radial direction of the stent body 100, and the thickness should be consistent with the radial thickness of the stent body 100, so that the inner membrane 200 and the outer membrane 300 can form a flat and smooth surface on the inner and outer walls of the stent body 100. Moreover, the more the number of connection points 500 is, the flatter the inner membrane 200 and the outer membrane 300 will be after tensioning.
[0061] Therefore, in some embodiments, at least two connection points 500 may be provided in a stent hole 110 to further improve the flatness of the inner membrane 200 and the outer membrane 300 after tensioning. Of course, considering that the expansion of the stent body 100 requires a certain activity space 400, the number of connection points 500 should not be too large and should be flexibly set according to actual conditions. They are not described one by one here and are all within the protection scope of this application.
[0062] In a specific embodiment, the shortest distance between the connection point 500 and the wall of the stent hole 110 in the axial direction of the stent body 100 is greater than the movement distance of the stent body 100 relative to the inner membrane 200 or relative to the outer membrane 300 when the stent body 100 expands or contracts along its own radial direction, so as to provide sufficient activity space 400 for the stent body 100.
[0063] Further, for the convenience of description, the outer diameter of the stent body 100 after expansion is the first diameter d0, and the outer diameter of the stent body 100 after contraction is the second diameter d0'. In this embodiment, the shortest distance L between the connection point 500 and the wall of the stent hole 110 in the axial direction of the stent body 100 is 0.15-0.9 times the difference between the first diameter d0 and the second diameter d0'. That is, L = (0.15-0.9) × (d0-d0'). Among them, 0.15 and 0.9 correspond to the values of the moving distance generated relative to the inner membrane 200 or relative to the outer membrane 300 when the stent body 100 expands or contracts along its own radial direction under more extreme conditions. Specifically, 0.15 corresponds to the case where the moving distance generated relative to the inner membrane 200 or the outer membrane 300 when the stent body 100 expands or contracts along its own radial direction takes a smaller value. At this time, the axial length of the stent body 100 is too long, which will cause difficulties in the implantation process; 0.9 corresponds to the case where the relative moving distance takes a larger value. At this time, the external force required to compress the stent body 100 is large, which will cause difficulties in the compression and withdrawal process of the foldable stent. This embodiment controls the coefficient in the formula to 0.15-0.9, which can cover most situations and has a wide range of applications. It is beneficial for users to reasonably set the required value of the shortest distance L according to the deformation capacity of the stent body 100, and is highly practical.
[0064] In an exemplary embodiment, the inner membrane 200 and the outer membrane 300 are both made of materials that are not elastic or have low elasticity, specifically, the elastic modulus is 10-100 MPa, and the tensile deformation rate is below 0.05. Among them, the thickness of the inner membrane 200 and the outer membrane 300 is preferably 0.01-0.5 mm. Of course, in actual production, the thickness of the inner membrane 200 and the outer membrane 300 should be a smaller value while being able to meet the tensile deformation rate, so as to minimize the volume occupied by the inner membrane 200 and the outer membrane 300 in the radial direction of the stent body 100, reduce the radial size of the foldable stent, and be more conducive to the delivery of the foldable catheter pump and reduce patient discomfort.
[0065] Specifically, when the stent body 100 is fully expanded, the inner diameter dimension D1 of the tensioned outer membrane 300 should be equal to or slightly smaller than the first diameter d0, for example, D1 = (0.95-1.00) d0. In this way, it can be ensured that after the stent body 100 is expanded, the outer membrane 300 can be fully tensioned to form a smooth outer surface. Relatively speaking, when the stent body 100 is fully expanded, the outer diameter dimension D2 of the inner membrane 200 is equal to or slightly smaller than the first diameter d0, preferably D2 = (0.90-0.98) d0, which can ensure that after the stent body 100 is expanded, the inner membrane 200 can be fully tensioned to form a smooth inner surface.
[0066] The present application also provides a foldable catheter pump, comprising a foldable impeller and a foldable bracket provided by any of the above embodiments, wherein the foldable impeller is suitable for being inserted into the foldable bracket.
[0067] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0068] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application, and these improvements and modifications should also be regarded as the protection scope of the present application.
Claims
1. A foldable bracket, characterized in that: include: The stent body is cylindrical and has a plurality of stent holes, which are suitable for the stent body to expand or contract along its radial direction; An inner membrane is arranged on the inner wall of the stent body; An outer membrane, disposed on the outer side wall of the stent body; The inner film and the outer film are at least partially connected, and the distal end of the inner film and the distal end of the outer film are sealingly connected.
2. The foldable bracket according to claim 1, characterized in that: The inner membrane is fixed to the stent body only at its distal end, and the outer membrane is fixed to the stent body only at its distal end, and a movable space for the stent body to move is formed between the inner membrane and the outer membrane.
3. The foldable bracket according to claim 2, characterized in that: A plurality of connection points are arranged between the inner membrane and the outer membrane. The connection points are located in the stent hole and are at a preset distance from the wall of the stent hole. The inner membrane and the outer membrane are connected and fixed at the connection points.
4. The foldable support according to claim 3, characterized in that: The connection point has a thickness in the radial direction of the bracket body, and the thickness of the connection point is consistent with the radial thickness of the bracket body; and / or, at least two connection points are arranged in one bracket hole.
5. The foldable support according to claim 3 or 4, characterized in that: The shortest distance between the connection point and the stent hole wall in the axial direction is greater than the movement distance of the stent body relative to the inner membrane or relative to the outer membrane when the stent body expands or contracts along its own radial direction.
6. The foldable support according to claim 5, characterized in that: The stent body has a first diameter after expansion, and has a second diameter after contraction; The shortest distance between the connection point and the wall of the stent hole in the axial direction is 0.15-0.9 times the difference between the first diameter and the second diameter.
7. The foldable support according to any one of claims 1 to 4, characterized in that: The stent body has a first diameter after expansion, and the inner membrane and the outer membrane are tensioned after the stent body is expanded; The inner diameter of the outer membrane after being stretched is smaller than or equal to the first diameter, and / or the outer diameter of the inner membrane after being stretched is smaller than or equal to the first diameter.
8. The foldable support according to any one of claims 1 to 4, characterized in that: The stent body comprises a distal connection section, a main section and a proximal connection section which are connected in sequence, wherein the distal connection section is a conical structure which shrinks from the main section toward the distal end, and the proximal connection section is a conical structure which shrinks from the main section toward the proximal end; The main body section is suitable for accommodating a foldable impeller, and the inner membrane and the outer membrane are both arranged at the main body section.
9. The foldable support according to claim 8, characterized in that: The bracket hole is in a rhombus shape, the bracket body is in a mesh structure, and the bracket body forms a connecting edge between two adjacent bracket holes; The connecting edge includes a first connecting segment and a second connecting segment, wherein the angle between the first connecting segment and the axis of the bracket body is smaller than the angle between the second connecting segment and the axis of the bracket body; The distal ends of the inner membrane and the outer membrane are both fixed to the first connecting section located at the distal end of the main body section.
10. A foldable catheter pump, characterized in that: include: A foldable impeller and a foldable support as described in any one of claims 1 to 9, wherein the foldable impeller is suitable for being inserted into the foldable support.