Support and tubing pump

Abstract

This utility model discloses a stent and a catheter pump. The stent is used to house the impeller of an interventional blood pump and can be operably switched between a radially folded state and a radially unfolded state. In the unfolded planar state, the stent includes a central mesh portion, a transition mesh portion, and a connecting rod portion, with the transition mesh portion connecting the central mesh portion and the connecting rod portion. The transition mesh portion has multiple support units and multiple support intersections. Among the multiple support intersections, support intersections at the same axial position are located on a ring around the axis of the stent, and the multiple support intersections are distributed on multiple rings at different axial positions, with intervals between adjacent rings. The transition mesh portion includes a first mesh and a second mesh. The first mesh spans a first number of first intervals along the axial direction, and the second mesh spans a second number of first intervals along the axial direction, with the first number being greater than the second number. The first interval refers to an interval with oblique support units.

Description

Technical Field

[0001] This utility model relates to the field of interventional pumps, and particularly to a stent and catheter pump. Background Technology

[0002] Catheter pumps are classified into non-foldable and foldable types. Foldable catheter pumps offer the advantage of smaller incisions during intervention, making them easier and faster to use. A key component enabling the foldability of the catheter pump is the stent. During blood pumping, the stent needs high rigidity to maintain the pump clearance; conversely, during folding, lower rigidity is desirable for easy retraction. These two opposing technical requirements pose significant challenges to the stent's structural design.

[0003] The existing support structure is a cylindrical mesh structure, comprising a roughly cylindrical expansion section in the middle, and roughly conical inlet and outlet contractions at both axial ends of the expansion section. The inlet and outlet contractions support the expansion section, maintaining its shape. Since most of the impeller is located within the expansion section, it exhibits good rigidity when expanded. However, when folded, the excessive rigidity of the contractions results in a large folded support volume, making it inconvenient for delivery pumps. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defect that the large stiffness of the support in the prior art leads to the difficulty of shrinkage, and to provide a support and a conduit pump.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A stent for accommodating the impeller of an interventional blood pump, the stent being operable to switch between a radially folded state and a radially extended state;

[0007] When the support is unfolded into a plane, the support includes a central mesh section, a transition mesh section, and a connecting rod section, with the transition mesh section connecting the central mesh section and the connecting rod section.

[0008] The transition mesh section has multiple support units and multiple support intersections; among the multiple support intersections, support intersections at the same axial position are located on a ring around the axis of the support, and the multiple support intersections are distributed on multiple rings at different axial positions, with intervals between adjacent rings;

[0009] The transition mesh portion includes a first mesh and a second mesh; the first mesh spans a first number of first intervals along the axial direction, and the second mesh spans a second number of first intervals along the axial direction, the first number being greater than the second number; wherein, the first interval refers to an interval having an oblique support unit, and the oblique support unit refers to a support unit among the plurality of support units whose extension direction intersects the axis.

[0010] The first mesh has a first maximum mesh spacing perpendicular to the axis, and the second mesh has a second maximum mesh spacing perpendicular to the axis, wherein the first maximum mesh spacing is less than twice the second maximum mesh spacing.

[0011] In this design, the stent is used to accommodate the impeller of an interventional blood pump. The stent can switch between radial folding and radial unfolding. The stent includes a central mesh section, a transition mesh section, and a connecting rod section. The two ends of the central mesh section are respectively provided with the transition mesh section and the connecting rod section. The impeller is installed in the central mesh section.

[0012] The transition mesh section has multiple support units and multiple support intersections. These support units and intersections form the main support structure of the transition mesh section and facilitate switching between radial folding and radial unfolding. Support intersections at the same axial position are located on a ring around the axis of the support. Multiple support intersections are distributed across multiple rings at different axial positions, with intervals between adjacent rings. This facilitates the folding and unfolding of the transition mesh section and allows for synchronous movement of intersections at the same position during folding and unfolding, improving the coordination of the support during folding and unfolding.

[0013] By setting the number of intervals between the first mesh openings to be greater than the number of intervals between the second mesh openings, the axial length of the first mesh opening is greater than that of the second mesh opening, thus lengthening the axial length of the first mesh opening. Furthermore, setting the first maximum mesh opening spacing of the first mesh opening to be less than twice the second maximum mesh opening spacing of the second mesh opening allows the first mesh opening to be lengthened while limiting its mesh opening spacing perpendicular to the axis, thereby keeping the first mesh opening roughly flat and elongated. This makes the first mesh opening easier to fold than the second mesh opening, effectively reducing the folding force required when the support is folded radially. Moreover, the limitation of the mesh opening spacing perpendicular to the axis of the first mesh opening allows it to still have good support strength during the radial expansion of the support. By simultaneously setting the first and second mesh openings at the transition mesh opening section, the support has better flexibility when folded, reducing the folding force of the support. At the same time, the overall support of the support by the first and second mesh openings also allows the support to still have good support strength when expanded, achieving a better balance between the flexibility of the support when folded and the support stiffness when expanded.

[0014] Preferably, the first mesh has a first mesh edge and a second mesh edge disposed opposite to each other, the first mesh edge having at least one first post intersection and at least two first post units divided by at least one first post intersection; no post units are disposed between the second mesh edge and the first post intersection.

[0015] In this design, no support unit is set between the intersection of the second mesh edge and the first support. Compared with the traditional diamond mesh structure support, the number of connection points is reduced, which makes the support more flexible when folded and also provides good support strength when expanded. This achieves a better balance between the flexibility when folded and the support stiffness when expanded.

[0016] In one alternative, the number of first pillar intersections can be two or more, thus dividing the first mesh edge into three or more first pillar units to form a larger mesh size.

[0017] Preferably, the connecting rod portion includes a plurality of connecting struts spaced apart in the circumferential direction, each of the connecting struts having a first end near the central mesh portion;

[0018] The plurality of connecting supports includes a first connecting support, the first mesh having a first vertex near the connecting rod portion, the first vertex being the branch point where the first end of the first connecting support branches toward the central mesh, and the two mesh edges connected to the first vertex being the two branches where the first connecting support branches toward the central mesh.

[0019] In this design, multiple connecting pillars form the support framework of the bracket, and these pillars circumferentially enclose the inlet and outlet of the bracket. The first connecting pillar branches at its first apex, forming two branches that extend towards the central mesh section, with mesh openings between the two branches.

[0020] Preferably, the connecting rod portion includes a plurality of connecting struts spaced apart in a circumferential direction, each connecting strut having a first end near the central mesh portion, the transition mesh portion having strut branches extending from the first end toward the central mesh portion, and the strut branches of adjacent connecting struts having branch intersection points.

[0021] The transition mesh section includes multiple rows of mesh areas arranged circumferentially. The axial dividing line where the multiple branch intersections are located divides the multiple rows of mesh areas. The multiple rows of mesh areas correspond one-to-one with the multiple connecting supports.

[0022] The plurality of connecting supports includes a first connecting support, and the first mesh is provided in the first mesh area corresponding to the first connecting support.

[0023] In this design, multiple connecting pillars form the support framework of the bracket, and these pillars circumferentially enclose the inlet and outlet of the bracket. Each connecting pillar has a branch extending from its first end toward the central mesh section, and adjacent connecting pillars are connected to each other through the intersection of these branches.

[0024] The transition mesh section includes multiple rows of mesh areas arranged circumferentially. These mesh areas are formed by splicing multiple connecting posts circumferentially, with each connecting post forming a row of mesh areas, thus creating a regular circumferential structure that facilitates folding and unfolding. The first connecting post has a first mesh to reduce the number of connection nodes.

[0025] Preferably, the plurality of connecting posts further includes a second connecting post, and the second mesh area corresponding to the second connecting post is provided with the second mesh; the first connecting post and the second connecting post are alternately arranged in the circumferential direction.

[0026] In this design, the first connecting post has a first mesh, and the second connecting post has a second mesh. The first and second connecting posts are alternately arranged circumferentially, so that the first and second meshes also alternate circumferentially. Because the size of the first mesh is larger than the size of the second mesh, and the first maximum mesh spacing of the first mesh is set to be less than twice the second maximum mesh spacing of the second mesh, the number of connection points can be reduced, giving the support better flexibility when folded, and also ensuring good support strength when expanded.

[0027] Preferably, the transition mesh portion has two meshes that are adjacent to each other with a common edge, and the two meshes that are adjacent to each other with a common edge have a first common vertex; one of the two meshes that are adjacent to each other with a common edge has a second support unit connected to the first common vertex, and the other has a third support unit connected to the first common vertex, the second support unit and the third support unit are collinear, and the width of the second support unit is greater than the width of the third support unit;

[0028] Optionally, the ratio of the column width of the second support unit to the column width of the third support unit is 2:1;

[0029] Optionally, the second support unit is connected to the first end of the connecting support;

[0030] Optionally, the column width of the second support unit is equal everywhere.

[0031] In this design, the two meshes are adjacent to each other at the first common vertex, facilitating the sharing of adjacent edges. The width of the second support unit is greater than that of the third support unit, causing the strength of the transition mesh section to gradually decrease from the first common vertex towards the center, which facilitates the transfer of force from the outside to the center, ensuring smooth folding and unfolding of the support.

[0032] Preferably, the connecting rod portion includes a plurality of connecting struts spaced apart in the circumferential direction, and adjacent connecting struts among the plurality of connecting struts form a third mesh between a portion of the edge of the transition mesh portion;

[0033] The projected area of ​​the third mesh in the radial plane is greater than the projected area of ​​the first mesh in the radial plane, and the radial plane is a plane perpendicular to the axis.

[0034] In this design, the projected area of ​​the third mesh in the radial plane is larger than that of the first mesh in the radial plane, making the size of the third mesh in the radial plane larger than that of the first mesh, which facilitates blood flow into or out of the stent.

[0035] Preferably, when the transition mesh portion is unfolded into a planar shape, the first mesh is approximately parallelogram-shaped, and the second mesh is approximately rhomboid-shaped.

[0036] In this design, the first mesh is a parallelogram and the second mesh is a rhombus, which facilitates the processing and fabrication of the support frame, as well as its folding and unfolding.

[0037] Preferably, the long diagonal of the second mesh is parallel to the axis, and the long diagonal refers to the longer diagonal of the second mesh.

[0038] In this design, the second mesh is rhomboid with its long diagonal parallel to the axis, which effectively reduces the second maximum mesh spacing. This reduces the folding force while maintaining support and prevents collapse caused by an excessively large second maximum mesh spacing.

[0039] Preferably, the second mesh edge has a constant width section and a variable width section, the column width of the constant width section is equal everywhere, the column width of the variable width section gradually decreases along the direction close to the central mesh portion, and the constant width section is located on the side of the variable width section close to the connecting rod portion;

[0040] Alternatively, the width of the post along the second mesh edge gradually decreases in the direction close to the central mesh portion.

[0041] In this design, the strength of the constant-width section is greater than that of the variable-width section. The constant-width section is located on the side of the variable-width section closest to the connecting rod, facilitating the transfer of force from the connecting rod to the variable-width section and simplifying folding and unfolding. The column width of the second mesh edge gradually decreases towards the central mesh, reducing material usage while ensuring sufficient support.

[0042] Preferably, in two adjacent first support units, the width of the first support unit closer to the connecting rod is greater than the width of the other first support unit; alternatively, the ratio between the width of the first support unit closer to the connecting rod and the width of the other first support unit is 5:4.

[0043] In this design, among two adjacent first support units, the column width of the first support unit closer to the connecting rod is greater than that of the other first support unit. This facilitates the transmission of support force from the connecting rod to the transition mesh section, and also benefits the folding and unfolding of the support frame.

[0044] The ratio of the column width of the first support unit closest to the connecting rod to the column width of the other first support unit is 5:4, which reduces material usage while ensuring sufficient support.

[0045] Preferably, when the transition mesh portion is unfolded into a planar shape, the angle between the first diagonal of the first mesh and the axis is less than 90 degrees, and the first diagonal refers to the diagonal with the largest projected length in the circumferential direction among the multiple diagonals of the first mesh.

[0046] In this design, the angle between the first diagonal and the axis is less than 90 degrees, which can reduce the first maximum mesh spacing. On the one hand, this reduces the folding force, and on the other hand, it maintains the support and prevents the first maximum mesh spacing from collapsing due to excessive spacing.

[0047] Preferably, the transition mesh portion includes an outlet transition portion located near the central mesh portion and an inlet transition portion located far from the central mesh portion, wherein the first mesh in the outlet transition portion and the first mesh in the inlet transition portion are circumferentially offset.

[0048] In this design, the first mesh in the outlet transition section and the first mesh in the inlet transition section are staggered circumferentially, so that the support force can be evenly distributed in the circumferential direction, ensuring the stiffness of the support in the axial direction and the uniformity of the folding force transmission.

[0049] Preferably, the central mesh portion has multiple fourth support units, which are cross-connected to form multiple fourth meshes, and the width of the fourth support unit gradually decreases from both ends to the middle.

[0050] In this design, the width of the fourth support unit gradually decreases from both ends toward the middle, ensuring sufficient support while reducing material usage.

[0051] Preferably, the ratio of the column width of the middle part of the fourth support unit to the column width of both ends of the fourth support unit is 3:4.

[0052] In this design, the ratio of the column width in the middle section of the fourth support unit to the column width at both ends of the fourth support unit is 3:4, which ensures sufficient support while reducing material usage.

[0053] Preferably, the transition mesh portion includes a fifth support unit connected to the fourth mesh; the fifth support unit has a uniform column width, or the column width of the fifth support unit gradually decreases towards the fourth support unit;

[0054] The edge width of the fifth support unit near the end of the fourth support unit is equal to that of the end of the fourth support unit.

[0055] In this scheme, the width of the fifth support unit is constant, or the width of the fifth support unit gradually decreases towards the fourth support unit, so that the angle between the fifth support unit and the adjacent edge is smaller, the stiffness is increased, and the radial stiffness of the support is ensured.

[0056] Preferably, the transition mesh portion has a first connecting rod that connects adjacent support units on both sides along the axial direction of the bracket, and the central mesh portion has a second connecting rod that connects adjacent support units on both sides along the axial direction, wherein the projected length of the first connecting rod along the axial direction is greater than the projected length of the second connecting rod along the axial direction.

[0057] In this design, the second link is located in the central mesh section and is used to connect adjacent support units, while the first link is located in the transition mesh section and is used to connect adjacent support units. The projected length of the first link along the axial direction is greater than the projected length of the second link along the axial direction, making it easier for the transition mesh section to fold along the axial direction and reducing the gripping force.

[0058] A catheter pump includes an impeller and a support as described above, the support having an inlet and an outlet, the impeller being mounted on a central cylindrical section of the support, the impeller being capable of driving blood from the inlet into the central cylindrical section and then out from the outlet.

[0059] In this design, the stent is made of nickel-titanium alloy in a metallic lattice structure. The stent is covered with a membrane, and inlets and outlets are formed at both ends. A motor drives an impeller to rotate via a drive shaft, thereby drawing blood in through the inlet and expelling it through the outlet, achieving the purpose of pumping blood.

[0060] A stent for accommodating the impeller of an interventional blood pump, the stent being operable to switch between a radially folded state and a radially extended state;

[0061] When the support is unfolded into a plane, the support includes a central mesh section, a transition mesh section, and a connecting rod section, with the transition mesh section connecting the central mesh section and the connecting rod section.

[0062] The transition mesh portion includes a first mesh and a second mesh; the first mesh has a first mesh edge and a second mesh edge disposed opposite to each other, and the first mesh edge includes at least one first support intersection and at least two first support units divided by at least one first support intersection.

[0063] When the support is unfolded into a planar shape, there is a line parallel to the branch direction between the intersection of the first support and the first position point inside the edge of the second mesh. The branch direction is one of the extension directions of each support edge of the second mesh. No support unit is set on the branch path along the line inside the first mesh.

[0064] The first mesh has a first maximum mesh spacing perpendicular to the axis of the support, and the second mesh has a second maximum mesh spacing perpendicular to the axis. The first maximum mesh spacing is less than twice the second maximum mesh spacing, and the mesh area of ​​the first mesh is greater than the mesh area of ​​the second mesh.

[0065] In this design, the stent is used to accommodate the impeller of an interventional blood pump. The stent can switch between radial folding and radial unfolding. The stent includes a central mesh section, a transition mesh section, and a connecting rod section. The two ends of the central mesh section are respectively provided with the transition mesh section and the connecting rod section. The impeller is installed in the central mesh section.

[0066] No support units are set on the branch path along the connecting line in the first mesh. At the same time, the first maximum mesh spacing of the first mesh is set to be less than twice the second maximum mesh spacing of the second mesh, and the mesh area of ​​the first mesh is set to be greater than the mesh area of ​​the second mesh. This reduces the number of connection points, making the support more flexible when folded, and also making the support have good support strength requirements when expanded. This achieves a better balance between the flexibility of the support when folded and the support stiffness when expanded.

[0067] Preferably, the area of ​​the first mesh is an integer multiple of the area of ​​the second mesh.

[0068] In this solution, the above-mentioned structural setup is adopted to form a regular structure with a certain regularity, which facilitates the folding and unfolding of the support.

[0069] Preferably, the first mesh has at least two regions divided by the connecting line, and at least one of the at least two regions has the same shape as the second mesh.

[0070] In this design, the movement of the first mesh during folding or unfolding is coordinated with that of the second mesh.

[0071] Preferably, the support includes a central cylindrical segment, a conical segment, and a cylindrical connecting segment arranged concentrically around an axis, wherein the diameter of the central cylindrical segment is larger than the diameter of the cylindrical connecting segment, and the conical segment connects the central cylindrical segment and the cylindrical connecting segment.

[0072] Optionally, a portion of the connecting rod is located in the cylindrical joint section, and another portion is located in the conical section; a portion of the transition mesh portion is located in the conical section, and another portion is located in the central cylindrical section; the end of the first mesh near the connecting rod is located in the conical section, and the end of the first mesh near the central mesh portion is located in the central cylindrical section.

[0073] Optionally, the first mesh is located in the first part of the tapered segment and has a first axial length, and the first mesh is located in the second part of the central cylindrical segment and has a second axial length, the second axial length being greater than the first axial length.

[0074] In this design, the support includes a central cylindrical section, a conical section, and a cylindrical connecting section arranged concentrically around the axis. The diameter of the central cylindrical section is larger than the diameter of the cylindrical connecting section. The conical section connects the central cylindrical section and the cylindrical connecting section, forming a structure that is large in the middle and small at both ends. This facilitates the installation of an impeller in the central cylindrical section and also facilitates the formation of an inlet and an outlet at both ends of the support.

[0075] The first mesh is located in the first part of the conical segment and has a first axial length. The first mesh is located in the second part of the central cylindrical segment and has a second axial length. The second axial length is greater than the first axial length, so that most of the first mesh is located in the central cylindrical segment and a small part is located in the conical segment. This increases the rigidity of the conical segment and also increases the flexibility of the central cylindrical segment, making it easier for the support to be folded and unfolded.

[0076] A stent for accommodating the impeller of an interventional blood pump, the stent being operable to switch between a radially folded state and a radially extended state;

[0077] When the support is unfolded into a plane, the support includes a central mesh section, a transition mesh section, and a connecting rod section, with the transition mesh section connecting the central mesh section and the connecting rod section.

[0078] The transition mesh portion includes a first mesh; the first mesh has a first mesh edge and a second mesh edge disposed opposite to each other, the first mesh edge includes at least one first support intersection point and at least two first support units divided by at least one first support intersection point; there is a line connecting the first support intersection point and a first position point within the second mesh edge along a branch direction, the branch direction being one of the extension directions of each support edge of the second mesh, and no support units are provided on the branch path along the connecting line within the first mesh;

[0079] The transition mesh section also has a second support column intersection point located in the same axial position as the first position point, and the number of support column units connected to the second support column intersection point is greater than or equal to the number of support column units connected to the first position point.

[0080] In this design, the stent is used to accommodate the impeller of an interventional blood pump. The stent can switch between radial folding and radial unfolding. The stent includes a central mesh section, a transition mesh section, and a connecting rod section. The two ends of the central mesh section are respectively provided with the transition mesh section and the connecting rod section. The impeller is installed in the central mesh section.

[0081] No support units are set on the branch path of the connecting line in the first mesh. At the same time, the number of support units connecting the intersection of the second support is greater than or equal to the number of support units connecting the first position point, which reduces the number of connection points. This makes the support more flexible when folded and also provides good support strength when expanded, achieving a better balance between the flexibility of the support when folded and the support stiffness when expanded.

[0082] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0083] The positive and progressive effects of this utility model are as follows: the stent is used to accommodate the impeller of an interventional blood pump. The stent can switch between radial folding and radial unfolding. The stent includes a central mesh section, a transition mesh section and a connecting rod section. The two ends of the central mesh section are respectively provided with the transition mesh section and the connecting rod section. The impeller is installed in the central mesh section.

[0084] The transition mesh section has multiple support units and multiple support intersections. These support units and intersections form the main support structure of the transition mesh section and facilitate switching between radial folding and radial unfolding. Support intersections at the same axial position are located on a ring around the axis of the support. Multiple support intersections are distributed across multiple rings at different axial positions, with intervals between adjacent rings. This facilitates the folding and unfolding of the transition mesh section and allows for synchronous movement of intersections at the same position during folding and unfolding, improving the coordination of the support during folding and unfolding.

[0085] By setting the number of intervals between the first mesh openings to be greater than the number of intervals between the second mesh openings, the axial length of the first mesh opening is greater than that of the second mesh opening, thus lengthening the axial length of the first mesh opening. Furthermore, setting the first maximum mesh opening spacing of the first mesh opening to be less than twice the second maximum mesh opening spacing of the second mesh opening allows the first mesh opening to be lengthened while limiting its mesh opening spacing perpendicular to the axis, thereby keeping the first mesh opening roughly flat and elongated. This makes the first mesh opening easier to fold than the second mesh opening, effectively reducing the folding force required when the support is folded radially. Moreover, the limitation of the mesh opening spacing perpendicular to the axis of the first mesh opening allows it to still have good support strength during the radial expansion of the support. By simultaneously setting the first and second mesh openings at the transition mesh opening section, the support has better flexibility when folded, reducing the folding force of the support. At the same time, the overall support of the support by the first and second mesh openings also allows the support to still have good support strength when expanded, achieving a better balance between the flexibility of the support when folded and the support stiffness when expanded. Attached Figure Description

[0086] Figure 1 This is a schematic diagram of the structure of a cardiac assist device in one embodiment of this application.

[0087] Figure 2 This is a schematic diagram of a cardiac assist device embedded in the heart in a specific embodiment of the present invention.

[0088] Figure 3 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 1 .

[0089] Figure 4 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 2 .

[0090] Figure 5 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 3 .

[0091] Figure 6 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 4 .

[0092] Figure 7 This is a partial structural diagram of the bracket after it has been unfolded, according to a preferred embodiment of the present invention.

[0093] Figure 8 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 5 .

[0094] Figure 9 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 6 .

[0095] Figure 10 This is a schematic diagram of the structure of the bracket according to a preferred embodiment of the present invention. Figure 7 .

[0096] Figure 11 This is a partial structural diagram of the diamond-shaped mesh network of the bracket according to a preferred embodiment of the present invention.

[0097] Figure 12 This is a partial structural diagram of the parallelogram mesh network of the bracket according to a preferred embodiment of the present invention.

[0098] Figure 13 This is a partial structural diagram of the hexagonal mesh network of the bracket according to a preferred embodiment of the present invention.

[0099] Figure 14 This is a schematic diagram of the structure of a bracket insertion device according to a preferred embodiment of the present invention.

[0100] Explanation of reference numerals in the attached drawings: Cardiac assist device 1000, drive assembly 100, coupler 200, interventional blood pump 300, catheter 310, pump head 320, flexible support 330, central mesh section 1, second connecting rod 11, transition mesh section 2, support unit 21, second support unit 211, third support unit 212, fourth support unit 213, fifth support unit 214, support intersection 22, support intersection 22a, support intersection 22b, support intersection 22c, support intersection 22d, first mesh 23, first maximum mesh spacing 231, first axial length 2311, second axial length 2312, first mesh edge 232, first support intersection 2321, first support unit 2322, first support unit 2322a, first support unit 2322b, second mesh edge 2 33, First position point 2331, First vertex 234, Second mesh 24, Second maximum mesh spacing 241, Third mesh 25, Fourth mesh 26, First connecting rod 27, Second support intersection 28, Connecting rod part 3, Connecting support 31, First connecting support 311, Second connecting support 312, Branch intersection 32, First interval 4, Axis 101, Axial dividing line 201, Mesh area 301, First mesh area 302, Second mesh area 303, Central cylindrical section 401, Conical section 501, Column joint section 601, Serrated ring 1010, Serrated ring 1020, Interval A, Interval B, Interval C, Support intersection D, Support unit E, Branch direction F, Rhombus LX1, Rhombus LX2, Support unit ZZ1, Interval JG, Support 700, Inlet 701, Covering 702. Detailed Implementation

[0101] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments described herein.

[0102] Please refer to Figures 1 to 2 , Figure 1 This is a schematic diagram of the structure of a cardiac assist device in one embodiment of this application; Figure 2 This is a schematic diagram of a cardiac assist device embedded in the heart in a specific embodiment of the present invention.

[0103] This application provides a cardiac assist device 1000. Please refer to [link / reference]. Figure 1 The cardiac assist device 1000 includes a drive assembly 100 and an interventional blood pump 300. The drive assembly 100 includes a housing and a motor located within the housing.

[0104] The interventional blood pump 300 further includes a coupler 200, a catheter 310, a pump head 320, and a flexible support 330. In use, the drive assembly 100 is typically located outside the subject (who may be human), while the pump head 320 can be inserted into the subject's body, specifically in the left ventricle, for example... Figure 2 As shown, this device assists the heart in pumping blood, reducing the burden on the heart. The pump head 320 can assist the left ventricle by pumping blood from the left ventricle into the aorta. Of course, the pump head 320 can also be inserted into other target locations of the subject via interventional surgery, for example, the pump head 320 can be inserted into the right ventricle, and the heart assist device 1000 can be used to assist the right ventricle. Furthermore, the pump head 320 can also be inserted into blood vessels or other organs.

[0105] The flexible support 330 is connected to the distal end of the pump head 320. During the insertion of the pump head 320 into the subject's body, the flexible support 330 can guide the insertion of components such as the pump housing. After the pump head 320 and other components are inserted into the desired position in the body, during the operation of the cardiac assist device 1000, the flexible support 330 can maintain the posture of the pump head 320 in the heart, thereby avoiding damage to the patient's tissues. In some embodiments, the distal end of the flexible support 330 is a flexible end, which can support the ventricular wall in a non-invasive or non-damaging manner, separating the blood inlet of the pump head 320 from the ventricular wall. The distal end of the flexible support 330 can be arc-shaped, or it can be a coiled flexible protrusion, such as... Figure 1 As shown. Those skilled in the art should understand that the illustrated shape is merely exemplary, and the flexible support 330 can be in any other suitable shape, as long as it achieves the above-described purpose.

[0106] In this embodiment of the application, the conduit 310 has a hollow structure, and a drive shaft passes through the inside of the conduit 310. Figure 1 (Not shown in the image). In this embodiment, the drive assembly 100 includes a housing and a motor located within the housing, the housing having an internal cavity to accommodate the motor. The transmission between the motor and the drive shaft can be achieved through magnetic coupling or eddy current coupling. The motor is connected to the proximal end of the catheter and the drive shaft via a coupler 200 and is configured as a power component to provide power. The coupler 200 can be detachably mounted on the drive assembly 100. Typically, the coupler 200 also has an infusion port, through which external infusion fluid can be injected into the catheter to flush or lubricate components such as bearings in the interventional blood pump 300.

[0107] When the coupler 200 is engaged with the drive assembly 100, the power output end of the motor is coupled to the proximal end of the drive shaft to drive the drive shaft to rotate, and the distal end of the conduit 310 is connected to the pump head 320. The pump head 320 includes a pump casing, a bracket, and an impeller, with the impeller located inside the pump casing.

[0108] The pump housing includes an internal support structure, which can be a metal lattice made of alloys such as nickel or titanium. This lattice has a mesh design to facilitate the radial expansion and contraction of the support. The pump housing also includes a membrane mounted on the support. The membrane covers the middle of the support to form a fluid channel, and the area at the distal end of the support not covered by the membrane forms a blood inlet. The area at the proximal end of the support not covered by the membrane forms a blood outlet section. The support also has distal connecting struts extending distally from the blood inlet and proximally from the blood outlet. The distal connecting struts are fixedly connected to the flexible support 330 and the distal bearing chamber, while the proximal connecting struts are fixedly connected to the proximal bearing chamber and other components.

[0109] Specifically, the impeller is supported inside the support frame. The impeller includes a hub, which is fixed to the impeller shaft. Typically, the hub has a central hole, into which the impeller shaft is inserted. The two ends of the impeller shaft are supported within the pump casing by proximal and distal bearings.

[0110] The drive shaft is connected to the hub, specifically, the distal end of the drive shaft (such as the impeller shaft mentioned above) is connected to the impeller hub. The rotation of the motor in the drive assembly 100 drives the drive shaft to rotate, which in turn drives the impeller to rotate. The impeller, driven to rotate, draws blood from the blood inlet of the pump housing into the pump housing, and then pumps it out from the blood outlet of the pump housing, thereby realizing the pump head's pumping and suction of blood.

[0111] The aforementioned interventional blood pump 300 is a foldable blood pump with a foldable pump head 320. During the delivery phase of the interventional blood pump 300, the pump head 320 is radially compressed inside the sheath of the interventional sheath, delivering blood at a smaller diameter to improve the permeability of the interventional blood pump 300 within the body and reduce damage to the human body. After the interventional blood pump 300 has delivered blood to the designated location, such as after exiting the sheath, the pump head 320 radially expands, restoring to a larger working diameter to obtain better hydraulic performance, such as supporting a larger flow rate.

[0112] like Figures 3-10 As shown, this embodiment discloses a stent for accommodating the impeller of an interventional blood pump, the stent being operable to switch between a radially folded state and a radially unfolded state.

[0113] like Figure 4 As shown, when the support is unfolded into a plane, the support includes a central mesh section 1, a transition mesh section 2, and a connecting rod section 3. The transition mesh section 2 connects the central mesh section 1 and the connecting rod section 3. Figures 3-7 As shown, the support is in a radially extended state, and the two ends of the central mesh section 1 are respectively provided with transition mesh section 2 and connecting rod section 3.

[0114] The transition mesh section 2 has multiple support units 21 and multiple support intersections 22, which form the main mesh support structure of the transition mesh section 2. Among the multiple support intersections 22, those at the same axial position are located on a ring surrounding the axis 101 of the support. The multiple support intersections 22 are distributed on multiple rings at different axial positions, with intervals between adjacent rings. Figure 4 As shown, the column intersection points 22 at the same length along axis 101 are all located on the same ring in the circumferential direction surrounding the support. For example, column intersection points 22a and 22b are located at the same axial position on the same ring, while column intersection points 22c and 22d are located at another axial position on another ring. Figure 6 In the middle, the intersection point 22 of the pillars at the same height position on axis 101 are all located on the same ring in the circumferential direction around the support.

[0115] In other alternative embodiments, there may be multiple such rings, which are spaced apart along the length of the axis.

[0116] like Figure 3 and Figure 5As shown, the transition mesh section 2 includes a first mesh 23 and a second mesh 24; the first mesh 23 spans a first number of first intervals 4 along the axial direction, and the second mesh 24 spans a second number of first intervals 4 along the axial direction, the first number being greater than the second number. The first interval 4 refers to the interval with oblique support units 21, and the oblique support unit 21 refers to the support unit 21 whose extension direction intersects the axis 101 among the plurality of support units 21.

[0117] In some mesh network structures formed by multi-level branching and cross-connection of support units 21, such as Figure 11 The diamond-shaped mesh network shown Figure 12 The parallelogram mesh network shown and Figure 13 The hexagonal mesh network shown contains multiple of the aforementioned intervals. However, not all intervals contain oblique support elements 21. For example... Figure 13 In the hexagonal mesh network shown, there are no oblique support elements in interval JG, only support elements parallel to the axis. This is because there is no branching of the support elements in interval JG; that is, the support intersections at the edge of the previous interval are not branched again in interval JG. Therefore, in this application, the first interval 4 with oblique support elements can be understood as a further branching of the support intersections at the edge of the previous interval. Each interval containing the branched support element 21 corresponds to a first-level branching of the support intersection.

[0118] The first mesh 23 has a first maximum mesh spacing 231 perpendicular to the axis 101, and the second mesh 24 has a second maximum mesh spacing 241 perpendicular to the axis 101. The first maximum mesh spacing 231 is less than twice the second maximum mesh spacing 241.

[0119] like Figure 3 As shown, in this embodiment, the central mesh portion 1 is a schematic area enclosed by the serrated rings 1010 and 1020. An interlocking area exists between the central mesh portion 1 and the transition mesh portion 2, with the serrated rings of the central mesh portion 1 and the transition mesh portion 2 interlocked together. The serrated rings 1010 and 1020 are solid lines representing a schematic area and do not actually exist. The serrated rings 1010 and 1020 are not shown in the other figures. The boundary line between the central mesh portion 1 and the transition mesh portion 2 can be referenced. Figure 3 understand.

[0120] In this embodiment, a greater number of first meshes 23 are provided in the transition mesh portion 2, spanning the first interval 4 along the axial direction. The maximum mesh spacing of the first meshes 23 perpendicular to the axis 101 is limited to less than twice that of the second meshes 24. This allows the first meshes to be elongated while limiting their mesh spacing perpendicular to the axis, thereby keeping the first meshes roughly as flat and elongated meshes that are easier to fold than the second meshes. This reduces the folding force when the support switches from a radially expanded state to a radially folded state, improving the flexibility of the support when folded. At the same time, by providing the aforementioned first and second meshes in the transition mesh portion, the support strength and expanded shape of the support can be maintained when the support returns to a radially expanded state, preventing the support from collapsing and deforming. This also takes into account the support stiffness of the support during expansion, achieving a better balance between the flexibility of the support during folding and the support stiffness during expansion.

[0121] The aforementioned first mesh can also be obtained by merging multiple second meshes and eliminating the support units between multiple second meshes. This can reduce the number of support units 21 in the transition mesh section 2, thereby reducing the folding force when the support switches from the radially unfolded state to the radially folded state.

[0122] The first and second meshes mentioned above are both independent mesh units, and their meshes do not have support units or sub-meshes divided by internal support units.

[0123] Specifically, compared to a mesh network without the first mesh 23, such as Figure 11 The diamond-shaped mesh network shown Figure 12 The parallelogram mesh network shown and Figure 13 The hexagonal mesh network shown in this embodiment, by providing a greater number of first mesh openings 23 that span the first interval 4 along the axial direction, can reduce the number of support units 21 within the transition mesh section 2. Figure 11 The diamond-shaped mesh network shown Figure 12 The parallelogram mesh network shown and Figure 13 In the hexagonal mesh network shown, each mesh is the smallest independent mesh unit, and its mesh edge is a support unit located within a first interval. Furthermore, each mesh spans the same number of first intervals, namely two first intervals.

[0124] In the bracket provided in this application embodiment, the number of first intervals 4 that the first mesh 23 crosses axially is greater than the number of second meshes 24. This means that a portion of the mesh edge of the first mesh 23 crosses at least two first intervals 4, and at the junction of at least two first intervals 4, there is no support unit E extending into the first mesh 23. Therefore, the number of support units 21 is reduced. Figure 6As shown, the first mesh 23 spans three first intervals 4, namely intervals A, B, and C. There are no support elements between the intersection of the two mesh edges of the first mesh 23 and the middle interval B. Figure 11 In the diamond mesh network shown, the combination of two diamond meshes (diamond LX1 and diamond LX2) is similar in shape to the first mesh 23, but with one additional support unit ZZ1.

[0125] In addition, if it is only to Figure 11 The diamond-shaped mesh network shown Figure 12 The parallelogram mesh shown is or Figure 13 In the hexagonal mesh network shown, some columns of mesh are elongated axially. While this increases the axial length of the columns, it does not increase the number of columns of mesh that span the first interval, thus failing to reduce the number of support units. Therefore, the technical solution provided in this application, by providing the aforementioned first mesh 23 in the transition mesh portion 2, can effectively reduce the number of support units 21, decrease the folding force when the stent switches from a radially expanded state to a radially folded state, improve the flexibility of the stent during folding, and make the stent easier to fold, facilitating clinical operation.

[0126] Furthermore, the setting of the first mesh 23 can be adjusted according to the actual mesh network, reducing only some support units 21 while still maintaining the second mesh 24. On this basis, the maximum mesh spacing of the first mesh 23 perpendicular to the axis is limited to less than twice that of the second mesh 24, which can effectively constrain the opening size of the first mesh 23 in the circumferential direction and prevent the support units 21 from being reduced too much, resulting in insufficient support stiffness when the support expands.

[0127] like Figure 4 and Figure 5 As shown, the first mesh 23 has a first mesh edge 232 and a second mesh edge 233 arranged opposite to each other. The first mesh edge 232 has at least one first support intersection 2321 and at least two first support units 2322 divided by the first support intersection 2321. No support units are provided between the second mesh edge 233 and the first support intersection 2321. It can also be understood that the support unit branching to the first mesh edge 232 is canceled at the branch position point in the middle of the second mesh edge 233.

[0128] The second mesh edge 233 spans at least two first intervals 4, with at least one dividing line (such as a ring) between the at least two first intervals 4. The second mesh edge 233 has at least one first position point 2331 intersecting the at least one dividing line. According to the branching design reflected by the mesh network formed by the second mesh 24, such as the branching method of a two-way diamond network, the aforementioned at least one first position point 2331 can also be like the intersection point 22 of the support pillars located in the same axial position (or the same ring), such as... Figure 4 Points 22d and 22c in the first mesh are used as branching points, and branches are made along the branching direction to the corresponding positions of the first mesh edge 232. However, these branches are removed in the first mesh 23 to reduce the number of support units 21.

[0129] For example Figure 4 and Figure 5 The first mesh 23 shown crosses intervals A, B, and C along the axial direction. Intervals A, B, and C are each three first intervals 4. The second mesh edge 233 crosses two first intervals 4, namely intervals A and B. The second mesh edge 233 has a first position point 2331 located between intervals A and B. The support intersection point D, which is at the same axial position as the first position point 2331, has two support units 21 that branch out towards the middle of the support, thus forming two adjacent sides of the second mesh 24. The first mesh 23 does not branch at the first position point 2331, thus eliminating the support unit E between the first position point 2331 and the first support intersection point 2321, thereby forming a larger first mesh 23 and reducing the number of support units 21 and connection points.

[0130] No support unit is set between the first position point 2331 on the edge 233 of the second mesh and the intersection point 2321 of the first support. This not only reduces the number of support units 21 in the first mesh 23, thereby reducing the folding force when the support switches from the radially expanded state to the radially folded state, but also improves the flexibility of the support when folded. Furthermore, when the support returns to the radially expanded state, the maximum mesh spacing of the first mesh 23 perpendicular to the axis 101 remains unchanged, thus maintaining the support strength and expanded shape of the support. This prevents the support from collapsing and deforming due to the large opening size of the first mesh along the circumferential direction, and takes into account the support stiffness of the support when expanding. This achieves a better balance between the flexibility of the support when folded and the support stiffness when expanded.

[0131] In an optional embodiment, the number of first support intersections 2321 can be two or more, thus dividing the first mesh edge 232 into three or more first support units 2322 to form a long, elongated mesh. Optionally, the first mesh 23 is approximately a parallelogram, and the second mesh 24 is approximately a rhombus. The first mesh 23 can be a combination of multiple second meshes 24 along one direction. When the long diagonal of the second mesh 24 is parallel to the axial direction, the first maximum mesh spacing 231 of the first mesh 23 can be equal to the second maximum mesh spacing 241 of the second mesh 24. This reduces the number of support units and obtains a larger first mesh 23 without increasing the first maximum mesh spacing 231 along the circumference, preventing the first maximum mesh spacing 231 from being too large and causing insufficient support stiffness when the support expands.

[0132] like Figure 5 and Figure 7 As shown, the connecting rod portion 3 includes multiple connecting struts 31 spaced apart circumferentially. Each connecting strut 31 has a first end near the central mesh portion 1. The multiple connecting struts 31 include a first connecting strut 311, and a first mesh 23 with a first vertex 234 near the connecting rod portion 3. The first vertex 234 is the branching point where the first end of the first connecting strut 311 branches towards the central mesh portion 1. The two mesh edges connected to the first vertex 234 form the two branches of the first connecting strut 311 branching towards the central mesh portion 1. The multiple connecting struts 31 form the support skeleton of the bracket, and the multiple connecting struts 31 circumferentially enclose the inlet and outlet of the bracket. The first connecting strut 311 branches at the first vertex 234, forming two branches that extend towards the central mesh portion 1, with a first mesh 23 formed between the two branches.

[0133] Since the tapered section of the transition mesh portion 2 is the main part that bears the folding force when the support is folded, in this embodiment, the first mesh 23 is set in the transition mesh portion 2 at both ends of the support and adjacent to the connecting support column 31. This can take advantage of the fact that no support column unit is set in the first mesh 23, reduce the folding stress, and achieve a better balance between the flexibility of the support when folding and the support stiffness when expanding.

[0134] like Figures 5-7 As shown, the connecting rod section 3 includes multiple connecting struts 31 spaced apart circumferentially. Each connecting strut 31 has a first end near the central mesh section 1. The transition mesh section 2 has strut branches extending from the first end towards the central mesh section 1. Adjacent connecting struts 31 have branch intersection points 32. Adjacent connecting struts 31 are connected through the branch intersection points 32, forming a cylindrical structure, which also serves as the support skeleton of the bracket. Simultaneously, the multiple connecting struts 31 also form the inlet and outlet of the bracket circumferentially.

[0135] The transition mesh section 2 includes multiple rows of mesh areas 301 arranged circumferentially. An axial dividing line 201, where multiple branch intersections 32 are located, divides the multiple rows of mesh areas 301. Each row of mesh areas 301 corresponds one-to-one with multiple connecting supports 31. One connecting support 31 corresponds to one row of mesh areas 301, and multiple connecting supports 31 correspond to multiple rows of mesh areas 301. Adjacent connecting supports 31 are connected through the same branch intersection 32, thus forming a regular structure arranged circumferentially. This also ensures that the movements of adjacent connecting supports 31 during folding and unfolding are coordinated and consistent.

[0136] The multiple connecting struts 31 include a first connecting strut 311, and a first mesh 23 is provided in the first mesh area 302 corresponding to the first connecting strut 311. For the multiple rows of mesh areas 301 corresponding to the multiple connecting struts 31, it is not necessary to provide the aforementioned first mesh 23 in every mesh area 301. By providing the first mesh 23 in the first mesh area 302 corresponding to a portion of the first connecting struts 311, the advantage of eliminating the strut unit within the first mesh 23 can be utilized to achieve a better balance between the flexibility of the support when folded and the supporting stiffness when expanded.

[0137] like Figures 5-7 As shown, the multiple connecting supports 31 also include a second connecting support 312, and the second mesh area 303 corresponding to the second connecting support 312 is provided with a second mesh 24; the first connecting supports 311 and the second connecting supports 312 are arranged alternately in the circumferential direction. Since the first mesh area 302 corresponding to the first connecting support 311 is provided with a first mesh 23, and the second mesh area 303 corresponding to the second connecting support 312 is not provided with a first mesh 23, but with multiple second meshes 24, and the first connecting supports 311 and the second connecting supports 312 are arranged alternately in the circumferential direction, the first meshes 23 and the second meshes 24 are also arranged alternately in the circumferential direction. At the same time, since the axial dimension of the first mesh 23 is larger than the dimension of the second mesh 24, and the first maximum mesh spacing 231 of the first mesh 23 is set to be less than twice the second maximum mesh spacing 241 of the second mesh 24, not only can the number of connection points be reduced, giving the support better flexibility when folded, but also giving the support good support strength requirements when expanded.

[0138] like Figure 5 As shown, the transition mesh section 2 has two meshes that are adjacent to each other with a common edge, and these two adjacent meshes share a first common vertex. One of the two adjacent meshes has a second support unit 211 connected to the first common vertex, and the other has a third support unit 212 connected to the first common vertex. The second support unit 211 and the third support unit 212 are collinear, and the width of the second support unit 211 is greater than the width of the third support unit 212. The second support unit 211 can be located on the side of the third support unit 212 closer to the connecting support 31. In this embodiment, as... Figure 5 As shown, the two meshes are adjacent to each other at the first common vertex, which facilitates the sharing of adjacent edges. The width of the second support unit 211 is greater than that of the third support unit 212, so that the strength of the transition mesh portion 2 gradually decreases from the first common vertex to the middle, which facilitates the transmission of force from the outside to the middle, making the support smooth when folding. At the same time, the width of the second support unit 211 near the connecting support 31 is widened, which does not affect the support stiffness after the support is restored and unfolded.

[0139] Optionally, the ratio of the column width of the second support unit 211 to the column width of the third support unit 212 is 2:1, so as to balance the rigidity and flexibility of the transition mesh portion 2 of the support.

[0140] Optionally, such as Figure 5 As shown, the second support unit 211 is connected to the first end of the connecting support 31 to form the structure of the transition mesh portion 2. Optionally, the width of the second support unit 211 is equal everywhere to maintain the radial stiffness of the transition mesh portion 2 in the unfolded state.

[0141] like Figure 3 and Figure 8 As shown, the connecting rod portion 3 includes multiple connecting struts 31 spaced circumferentially. Adjacent connecting struts 31 and a portion of the edge of the transition mesh portion 2 form a third mesh 25. The projected area of ​​the third mesh 25 in the radial plane is larger than the projected area of ​​the first mesh 23 in the radial plane. The radial plane is a plane perpendicular to the axis 101. In this embodiment, the third mesh 25 is mainly located within the conical section of the transition mesh portion 2, serving as a flow-through mesh for blood to flow into or out of the support. Since the projected area of ​​the third mesh 25 in the radial plane is larger than that of the first mesh 23, the flow-through cross-sectional area of ​​the third mesh 25 in the radial plane is larger than that of the first mesh 23, facilitating blood flow and reducing damage to blood cells from the edges of the strut units. The portion of the first mesh 23 located in the conical section has a certain projected area in the radial plane, allowing blood to flow through. Simultaneously, the remaining portion of the first mesh 23 supports the blood flow channel and maintains its shape.

[0142] like Figure 7 As shown, when the transition mesh portion 2 is unfolded into a planar shape, the first mesh 23 is a parallelogram and the second mesh 24 is a rhombus. In this embodiment, the first mesh 23 is set as a parallelogram with unequal adjacent sides, and the second mesh 24 is set as a rhombus. In this way, the first mesh 23 can be obtained by reducing the shared support units between adjacent second meshes 24, which facilitates the processing and manufacturing of the bracket. Moreover, this method does not increase the first maximum mesh spacing 231 of the first mesh 23 perpendicular to the axial direction, thereby improving the bracket's foldability while maintaining its supporting rigidity.

[0143] like Figure 4 and Figure 7As shown, the long diagonal of the second mesh 24 is parallel to the axis 101. The long diagonal refers to the longer diagonal of the second mesh 24. In this embodiment, configuring the second mesh 24 as a rhombus with its long diagonal parallel to the axis 101 effectively reduces the second maximum mesh spacing 241 of the second mesh 24. This reduces the folding force while maintaining support and preventing collapse due to an excessively large second maximum mesh spacing 241. Furthermore, the first maximum mesh spacing 231 of the first mesh 23 obtained by merging the second mesh 24 can also be the same as the second maximum mesh spacing 241, improving the folding ease of the support while maintaining its supporting rigidity.

[0144] Optionally, the second mesh edge 233 has a constant width section and a variable width section. The column width of the constant width section is equal everywhere, while the column width of the variable width section gradually decreases along the direction close to the central mesh portion 1. The constant width section is located on the side of the variable width section closer to the connecting rod portion 3. In this embodiment, as... Figure 5 As shown, the strength of the constant-width section is greater than that of the variable-width section. The constant-width section is located on the side of the variable-width section closer to the connecting rod 3, which facilitates the connecting rod 3 to transmit force to the variable-width section through the constant-width section, and facilitates folding and unfolding.

[0145] Alternatively, in an optional embodiment, the column width of the second mesh edge 233 gradually decreases along the direction close to the central mesh portion 1, which facilitates the transmission of force from the connecting rod portion 3 to the variable width portion through the equal width section, making it easier to fold and unfold, and reducing material while ensuring sufficient support.

[0146] In an optional embodiment, among two adjacent first support units 2322, the column width of the first support unit 2322a closer to the connecting rod portion 3 is greater than the column width of the other first support unit 2322b. This adjacency can be axial. In this embodiment, as... Figure 5 As shown, in two adjacent first support units 2322, the column width of the first support unit 2322a closer to the connecting rod part 3 is greater than the column width of the other first support unit 2322b, which facilitates the connecting rod part 3 to transmit the supporting force from itself to the transition mesh part 2, and is also beneficial to the folding and unfolding of the support.

[0147] Optionally, the ratio between the column width of the first support unit 2322a near the link 3 and the column width of the other first support unit 2322b is 5:4, reducing material usage while ensuring sufficient support.

[0148] When the transition mesh portion 2 is unfolded into a planar shape, the angle between the first diagonal of the first mesh 23 and the axis 101 is less than 90 degrees. The first diagonal refers to the diagonal among the multiple diagonals of the first mesh 23 that has the largest projected length in the circumferential direction. In this embodiment, as... Figure 7As shown, the angle between the first diagonal and the axis 101 is less than 90 degrees, which can reduce the first maximum mesh spacing 231. On the one hand, it reduces the folding force, and on the other hand, it can maintain the support and prevent the first maximum mesh spacing 231 of the first mesh 23 from collapsing due to being too large.

[0149] like Figures 4-6 As shown, the transition mesh section 2 includes an outlet transition section located near the central mesh section 1 and an inlet transition section located far from the central mesh section 1. The first mesh 23 in the outlet transition section and the first mesh 23 in the inlet transition section are offset circumferentially. This circumferential offset arrangement of the first mesh 23 in the outlet transition section and the first mesh 23 in the inlet transition section utilizes the advantage of eliminating the need for support units within the first mesh 23, allowing for a uniform distribution of support force in the circumferential direction. This ensures the uniformity of the support's axial stiffness and the transmission of bending force, and provides a better balance between the support's flexibility during bending and its supporting stiffness during expansion.

[0150] The central mesh section 1 has multiple fourth support units 213, which are cross-connected to form multiple fourth mesh openings 26. The width of the fourth support unit 213 gradually decreases from both ends towards the middle. In this embodiment, as shown... Figure 5 As shown, since the two ends of the fourth support unit 213 are connected to different nodes, the two ends of the fourth support unit 213 are subjected to greater forces when folding and unfolding. Therefore, the column width of the fourth support unit 213 is gradually reduced from the two ends to the middle part, which ensures that the fourth support unit 213 has sufficient support force while saving materials.

[0151] In an optional embodiment, the ratio of the column width of the middle part of the fourth support unit 213 to the column width of both ends of the fourth support unit 213 is 3:4, which ensures that the fourth support unit 213 has sufficient support force while also saving materials.

[0152] like Figure 5 As shown, the transition mesh portion 2 includes a fifth support unit 214 connected to the fourth mesh 26; the fifth support unit 214 has a uniform column width, or the column width of the fifth support unit 214 gradually decreases towards the fourth support unit 213, and the edge width of the end of the fifth support unit 214 near the fourth support unit 213 is equal to that of the end of the fourth support unit 213. The fifth support unit 214 intersects with the first support at point 2321. When the support is folded or unfolded, the transition mesh portion 2 deforms considerably. Therefore, in this embodiment, as... Figure 5As shown, the fifth support unit 214 has a uniform column width. Compared to the fourth support unit 213, which has wider columns at both ends and narrower columns in the middle, the increased column width of the fifth support unit 214 increases its rigidity. This allows the included angle of the fourth mesh 26 in the transition mesh section 2 at both ends to be adjusted to a smaller angle, thus reducing the angle change during clamping and facilitating clamping. At the same time, the relatively wide column width of the fifth support unit 214 results in greater rigidity, ensuring radial support rigidity when the support returns to its radially extended state, even when the included angle becomes smaller.

[0153] In an optional embodiment, the column width of the fifth support unit 214 gradually decreases towards the fourth support unit 213, thereby reducing the angle between the fifth support unit 214 and the adjacent edge, increasing the stiffness, and ensuring the radial stiffness of the support.

[0154] The fourth support unit 213 to the fifth support unit 214 are irregular variations. They are designed to reduce material, folding size and gripping force when the force transmission path meets the conditions. Since the fourth mesh 26 in the transition mesh section 2 is less affected by the two ends, the fourth support unit 213 can be designed as a configuration that is wide at both ends and narrow in the middle.

[0155] like Figure 5 As shown, the transition mesh section 2 has a first connecting rod 27, which connects adjacent support units 21 on both sides along the axis 101 of the support. The central mesh section 1 has a second connecting rod 11, which connects adjacent support units 21 on both sides along the axis 101. The projected length of the first connecting rod 27 along the axis 101 is greater than the projected length of the second connecting rod 11 along the axis 101. When the support is folded or unfolded, the transition mesh section 2 deforms significantly. Therefore, adding the first connecting rod 27 between adjacent support units increases the force transmitted by the support units in the axial direction, facilitating the unfolding or folding of the support. Simultaneously, adding the second connecting rod 11 between adjacent support units in the central mesh section 1 also increases the force transmitted by the support units in the axial direction, facilitating the unfolding or folding of the support. When the support is folded or unfolded, the deformation of the transition mesh portion 2 is relatively large. Therefore, the projected length of the first link 27 along the axis 101 is greater than the projected length of the second link 11 along the axis 101, so that the transition mesh portion 2 can be folded along the axis 101 and the gripping force is reduced.

[0156] This embodiment also discloses a duct pump, which includes an impeller and a support as described above. The support has an inlet and an outlet, and the impeller is mounted on the central cylindrical section 401 of the support (e.g., Figure 9As shown, the impeller drives blood from the inlet into the central cylindrical section 401 and then out through the outlet. The stent is typically made of a metal mesh of nickel-titanium alloy, covered with a membrane, and has inlets and outlets at both ends. The motor drives the impeller to rotate via a drive shaft, drawing blood in through the inlet and expelling it through the outlet, thus achieving the purpose of pumping blood.

[0157] This embodiment discloses a stent for accommodating the impeller of an interventional blood pump, the stent being operably switchable between a radially folded state and a radially extended state. For example... Figure 7 As shown, when the support is unfolded into a plane, the support includes a central mesh section 1, a transition mesh section 2, and a connecting rod section 3. The transition mesh section 2 connects the central mesh section 1 and the connecting rod section 3. Figure 9 and Figure 10 As shown, the support is in a radially extended state, and the two ends of the central mesh section 1 are respectively provided with transition mesh section 2 and connecting rod section 3.

[0158] The transition mesh section 2 includes a first mesh 23 and a second mesh 24; the first mesh 23 has a first mesh edge 232 and a second mesh edge 233 disposed opposite to each other, and the first mesh edge 232 includes at least one first support intersection 2321 and at least two first support units 2322 divided by the at least one first support intersection 2321. Figure 10 As shown, multiple first mesh openings 23 and multiple second mesh openings 24 form the main mesh support structure of the transition mesh section 2.

[0159] like Figure 7 and Figure 10 As shown, when the support is unfolded into a planar shape, there is a line parallel to the branching direction between the intersection point 2321 of the first support column and the first position point 2331 within the edge 233 of the second mesh. The branching direction is one of the extension directions of each support column edge of the second mesh 24, such as the branching direction F. No support column unit is set on the branching path along the connecting line within the first mesh 23. This can also be understood as the support column unit branching towards the first mesh edge 232 along the direction F being canceled at the branching position point in the middle of the second mesh edge 233. The first mesh 23 does not branch at the first position point 2331, thus canceling the support column unit between the first position point 2331 and the intersection point 2321 of the first support column, thereby forming a larger first mesh and reducing the number of support column units and connection points.

[0160] The first mesh 23 has a first maximum mesh spacing 231 perpendicular to the axis 101 of the support, and the second mesh 24 has a second maximum mesh spacing 241 perpendicular to the axis 101. The first maximum mesh spacing 231 is less than twice the second maximum mesh spacing 241, and the mesh area of ​​the first mesh 23 is greater than the mesh area of ​​the second mesh 24. The setting of the first mesh 23 can be adjusted according to the actual mesh network, reducing only some support units while still maintaining the second mesh 24. Furthermore, the first maximum mesh spacing 231 of the first mesh 23 perpendicular to the axis is limited to less than twice the second maximum mesh spacing 241. This effectively constrains the circumferential opening size of the first mesh 23, preventing the excessive reduction of support units from causing insufficient support stiffness during support expansion. Based on this, the mesh area of ​​the first mesh 23 is configured to be larger than that of the second mesh 24, which can effectively reduce the number of connecting supports. Compared with the traditional diamond-shaped mesh structure support, the number of connection points is reduced, which makes the support more flexible when folded, and also makes the support have good support strength requirements when expanded, thus achieving a better balance between the flexibility of the support when folded and the support stiffness when expanded.

[0161] like Figure 9 As shown, the area of ​​the first mesh 23 is an integer multiple of the area of ​​the second mesh 24, forming a regular structure with a certain pattern, which facilitates the folding and unfolding of the bracket, and also facilitates the processing and manufacturing of the bracket. In this embodiment, as... Figure 9 As shown, the area of ​​the first mesh 23 is twice the area of ​​the second mesh 24. Of course, in other alternative embodiments, the area of ​​the first mesh 23 may also be more than twice the area of ​​the second mesh 24.

[0162] like Figure 9 As shown, the first mesh 23 has at least two regions defined by the aforementioned connecting lines, and at least one of these regions has the same shape as the second mesh 24. This facilitates coordination between the movement of the first mesh 23 and the second mesh 24 during folding or unfolding.

[0163] like Figure 9 As shown, the support includes a central cylindrical section 401, a tapered section 501 and a cylindrical connecting section 601 arranged concentrically around the axis 101. The diameter of the central cylindrical section 401 is larger than the diameter of the cylindrical connecting section 601, and the tapered section 501 connects the central cylindrical section 401 and the cylindrical connecting section 601.

[0164] like Figure 9As shown, the support includes a central cylindrical section 401, a conical section 501, and a cylindrical connecting section 601 arranged concentrically around the axis 101. The diameter of the central cylindrical section 401 is larger than the diameter of the cylindrical connecting section 601. The conical section 501 connects the central cylindrical section 401 and the cylindrical connecting section 601, forming a structure that is large in the middle and small at both ends. This facilitates the installation of an impeller in the central cylindrical section 401 and also facilitates the formation of an inlet and an outlet at the conical sections 501 at both ends of the support. At the same time, the inclined surface provided by the conical section 501 facilitates the folding of the support.

[0165] Optionally, such as Figure 9 As shown, a portion of the connecting rod portion 3 is located in the cylindrical joint section 601, and another portion is located in the conical section 501; a portion of the transition mesh portion 2 is located in the conical section 501, and another portion is located in the central cylindrical section 401; the end of the first mesh 23 near the connecting rod portion 3 is located in the conical section 501, and the end of the first mesh 23 near the central mesh portion 1 is located in the central cylindrical section 401.

[0166] Optionally, such as Figure 9 As shown, the first mesh 23 located in the first part of the conical segment 501 has a first axial length 2311, and the first mesh 23 located in the second part of the central cylindrical segment 401 has a second axial length 2312, which is greater than the first axial length 2311. The first mesh 23 located in the first part of the conical segment 501 has a first axial length 2311, and the first mesh 23 located in the second part of the central cylindrical segment 401 has a second axial length 2312, which is greater than the first axial length 2311. This ensures that most of the first mesh 23 is located within the central cylindrical segment 401, and the eliminated support units are also located within the central cylindrical segment 401. A small portion of the first mesh 23 is located within the conical segment 501, thereby increasing the rigidity of the conical segment 501 and preventing it from collapsing due to insufficient rigidity caused by too few support units. It also increases the flexibility of the central cylindrical segment 401, facilitating the folding and unfolding of the support.

[0167] like Figure 10 As shown, a stent is used to accommodate the impeller of an interventional blood pump, and the stent is operatively switchable between a radially folded state and a radially extended state.

[0168] like Figure 7 As shown, when the support is unfolded into a plane, the support includes a central mesh section 1, a transition mesh section 2, and a connecting rod section 3. The transition mesh section 2 connects the central mesh section 1 and the connecting rod section 3. Figure 9 and Figure 10 As shown, the support is in a radially extended state, and the two ends of the central mesh section 1 are respectively provided with transition mesh section 2 and connecting rod section 3.

[0169] like Figure 9 and Figure 10As shown, the transition mesh portion 2 includes a first mesh 23; the first mesh 23 has a first mesh edge 232 and a second mesh edge 233 disposed opposite to each other. The first mesh edge 232 includes at least one first support intersection point 2321 and at least two first support units 2322 divided by the at least one first support intersection point 2321; there is a line connecting the first support intersection point 2321 and a first position point 2331 within the second mesh edge 233 along a branch direction F. The branch direction F is one of the extension directions of each support edge of the second mesh 24. No support units are provided on the branch path along the connecting line within the first mesh 23. This can also be understood as the support unit branching towards the first mesh edge 232 being canceled at the branch position point in the middle of the second mesh edge 233. The first mesh 23 does not branch at the first position point 2331, thus canceling the support unit between the first position point 2331 and the first support intersection point 2321, thereby forming a larger first mesh 23 and reducing the number of support units and connection points.

[0170] like Figure 10 As shown, the transition mesh section 2 also has a second support intersection point 28 located in the same axial position as the first position point 2331. By canceling the support unit to form the first mesh 23, the number of support units connected to the second support intersection point 28 is greater than or equal to the number of support units connected to the first position point 2331.

[0171] like Figure 10 As shown, the number of support units connected at the intersection point 28 of the second support is greater than the number of support units connected at the first position point 2331. Reducing the number of support units and connection points gives the support better flexibility when folded, while also ensuring good support strength when expanded. This achieves a better balance between the flexibility when folded and the support stiffness when expanded.

[0172] Of course, in an optional embodiment, the first mesh 23 can be arranged continuously in the circumferential direction, and the number of support units connected by the second support intersection 28 is equal to the number of support units connected by the first position point 2331, and can be less than the number of support units connected by other support intersections, so as to facilitate the folding and unfolding of the support.

[0173] like Figure 10As shown, in this embodiment, the stent is used to house the impeller of an interventional blood pump. The stent can switch between radial folding and radial expansion. The stent includes a central mesh portion 1, a transition mesh portion 2, and a connecting rod portion 3. The transition mesh portion 2 and the connecting rod portion 3 are respectively provided at both ends of the central mesh portion 1. The impeller is installed in the central mesh portion 1. No support units are provided on the branch path along the connecting line in the first mesh 23, so that the number of support units connected to the second support intersection 28 is greater than or equal to the number of support units connected to the first position point 2331. This reduces the number of connection points and support units in the stent mesh structure, giving the stent better flexibility when folding and good support strength when expanding, achieving a better balance between the flexibility of the stent when folding and the support stiffness when expanding.

[0174] like Figure 14 As shown, the pump head includes a pump housing, which includes a support 700 and a membrane 702 covering the support and defining a blood flow channel. When the pump head is inserted into the trumpet-shaped introducing device 701, the axial stiffness of the support 700 becomes particularly important, as the axial thrust of the support 700 is partially transmitted radially. If the radial stiffness of the support 700 is insufficient, the mesh of the support 700 will deform, causing the middle part to bulge before entering the compression section of the introducing device 701. In this embodiment, the support 700 does not have a support unit in the first mesh 23. This reduces the folding force when the support 700 switches from a radially expanded state to a radially folded state, while also ensuring the support stiffness of the support 700 during expansion. This achieves a better balance between the flexibility of the support 700 during folding and the support stiffness during expansion, allowing the support to be smoothly inserted into the introducing device 700.

[0175] In the description herein, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0176] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A support, characterized in that, The stent is used to accommodate the impeller of the interventional blood pump, and the stent is operably switchable between a radially folded state and a radially unfolded state; When the support is unfolded into a plane, the support includes a central mesh section, a transition mesh section, and a connecting rod section, with the transition mesh section connecting the central mesh section and the connecting rod section. The transition mesh section has multiple support units and multiple support intersections; among the multiple support intersections, support intersections at the same axial position are located on a ring around the axis of the support, and the multiple support intersections are distributed on multiple rings at different axial positions, with intervals between adjacent rings; The transition mesh portion includes a first mesh and a second mesh; the first mesh spans a first number of first intervals along the axial direction, and the second mesh spans a second number of first intervals along the axial direction, the first number being greater than the second number; wherein, the first interval refers to an interval having an oblique support unit, and the oblique support unit refers to a support unit among the plurality of support units whose extension direction intersects the axis. The first mesh has a first maximum mesh spacing perpendicular to the axis, and the second mesh has a second maximum mesh spacing perpendicular to the axis, wherein the first maximum mesh spacing is less than twice the second maximum mesh spacing.

2. The bracket as described in claim 1, characterized in that, The first mesh has a first mesh edge and a second mesh edge disposed opposite to each other. The first mesh edge has at least one first support intersection and at least two first support units divided by at least one first support intersection. No support units are disposed between the second mesh edge and the first support intersection.

3. The bracket as described in claim 1, characterized in that, The connecting rod portion includes multiple connecting struts spaced apart in a circumferential direction, each connecting strut having a first end near the central mesh portion; The plurality of connecting supports includes a first connecting support, the first mesh having a first vertex near the connecting rod portion, the first vertex being the branch point where the first end of the first connecting support branches toward the central mesh, and the two mesh edges connected to the first vertex being the two branches where the first connecting support branches toward the central mesh.

4. The bracket as described in claim 1, characterized in that, The connecting rod portion includes multiple connecting struts spaced apart in the circumferential direction. Each connecting strut has a first end near the central mesh portion. The transition mesh portion has strut branches extending from the first end toward the central mesh portion. There are branch intersections between the strut branches of adjacent connecting struts. The transition mesh section includes multiple rows of mesh areas arranged circumferentially. The axial dividing line where the multiple branch intersections are located divides the multiple rows of mesh areas. The multiple rows of mesh areas correspond one-to-one with the multiple connecting supports. The plurality of connecting supports includes a first connecting support, and the first mesh is provided in the first mesh area corresponding to the first connecting support.

5. The bracket as described in claim 4, characterized in that, The plurality of connecting pillars also includes a second connecting pillar, and the second mesh area corresponding to the second connecting pillar is provided with the second mesh; the first connecting pillar and the second connecting pillar are alternately arranged in the circumferential direction.

6. The bracket as described in claim 1, characterized in that, The transition mesh portion has two meshes that are adjacent to each other with a common edge, and the two meshes that are adjacent to each other with a common edge have a first common vertex; one of the two meshes that are adjacent to each other with a common edge has a second support unit connected to the first common vertex, and the other has a third support unit connected to the first common vertex. The second support unit and the third support unit are collinear, and the width of the second support unit is greater than the width of the third support unit. Optionally, the ratio of the column width of the second support unit to the column width of the third support unit is 2:1; Optionally, the second support unit is connected to the first end of the connecting support; Optionally, the column width of the second support unit is equal everywhere.

7. The bracket as described in claim 1, characterized in that, The connecting rod portion includes multiple connecting struts spaced apart in the circumferential direction, and adjacent connecting struts among the multiple connecting struts form a third mesh with a portion of the edge of the transition mesh portion; The projected area of ​​the third mesh in the radial plane is greater than the projected area of ​​the first mesh in the radial plane, and the radial plane is a plane perpendicular to the axis.

8. The bracket as described in claim 1, characterized in that, When the transition mesh portion is unfolded into a planar shape, the first mesh is approximately parallelogram-shaped, and the second mesh is approximately rhomboid-shaped.

9. The bracket as described in claim 8, characterized in that, The long diagonal of the second mesh is parallel to the axis, and the long diagonal refers to the longer diagonal of the second mesh.

10. The stent as described in claim 2, characterized in that, The second mesh edge has a constant width section and a variable width section. The column width of the constant width section is equal everywhere, and the column width of the variable width section gradually decreases along the direction close to the central mesh portion. The constant width section is located on the side of the variable width section close to the connecting rod portion. Alternatively, the width of the post along the second mesh edge gradually decreases in the direction close to the central mesh portion.

11. The bracket as described in claim 2, characterized in that, In two adjacent first support units, the width of the first support unit closer to the connecting rod is greater than the width of the other first support unit; optionally, the ratio between the width of the first support unit closer to the connecting rod and the width of the other first support unit is 5:

4.

12. The bracket as claimed in claim 1, characterized in that, When the transition mesh portion is unfolded into a planar shape, the angle between the first diagonal of the first mesh and the axis is less than 90 degrees. The first diagonal refers to the diagonal with the largest projected length in the circumferential direction among the multiple diagonals of the first mesh.

13. The bracket as described in claim 1, characterized in that, The transition mesh section includes an outlet transition section located near the central mesh section and an inlet transition section located far from the central mesh section. The first mesh in the outlet transition section and the first mesh in the inlet transition section are circumferentially offset.

14. The bracket as claimed in claim 1, characterized in that, The central mesh section has multiple fourth support units, which are cross-connected to form multiple fourth meshes. The width of the fourth support unit gradually decreases from both ends to the middle.

15. The stent as described in claim 14, characterized in that, The ratio of the column width in the middle part of the fourth support unit to the column width at both ends of the fourth support unit is 3:

4.

16. The stent as claimed in claim 14, characterized in that, The transition mesh portion includes a fifth support unit connected to the fourth mesh; the fifth support unit has a uniform column width, or the column width of the fifth support unit gradually decreases towards the fourth support unit; The edge width of the fifth support unit near the end of the fourth support unit is equal to that of the end of the fourth support unit.

17. The stent as claimed in claim 14, characterized in that, The transition mesh section has a first connecting rod, which connects adjacent support units on both sides along the axial direction of the bracket. The central mesh section has a second connecting rod, which connects adjacent support units on both sides along the axial direction. The projected length of the first connecting rod along the axial direction is greater than the projected length of the second connecting rod along the axial direction.

18. A duct pump, characterized in that, The catheter pump includes an impeller and a support as described in any one of claims 1-17, the support having an inlet and an outlet, the impeller being mounted on a central cylindrical section of the support, the impeller being capable of driving blood from the inlet into the central cylindrical section and then out from the outlet.

19. A stent, characterized in that, The stent is used to accommodate the impeller of the interventional blood pump, and the stent is operably switchable between a radially folded state and a radially unfolded state; When the support is unfolded into a plane, the support includes a central mesh section, a transition mesh section, and a connecting rod section, with the transition mesh section connecting the central mesh section and the connecting rod section. The transition mesh portion includes a first mesh and a second mesh; the first mesh has a first mesh edge and a second mesh edge disposed opposite to each other, and the first mesh edge includes at least one first support intersection and at least two first support units divided by at least one first support intersection. When the support is unfolded into a planar shape, there is a line parallel to the branch direction between the intersection of the first support and the first position point inside the edge of the second mesh. The branch direction is one of the extension directions of each support edge of the second mesh. No support unit is set on the branch path along the line inside the first mesh. The first mesh has a first maximum mesh spacing perpendicular to the axis of the support, and the second mesh has a second maximum mesh spacing perpendicular to the axis. The first maximum mesh spacing is less than twice the second maximum mesh spacing, and the mesh area of ​​the first mesh is greater than the mesh area of ​​the second mesh.

20. The stent as claimed in claim 19, characterized in that, The area of ​​the first mesh is an integer multiple of the area of ​​the second mesh.

21. The stent as claimed in claim 19, characterized in that, The first mesh has at least two regions divided by the connecting lines, and at least one of the at least two regions has the same shape as the second mesh.

22. The stent as claimed in claim 19, characterized in that, The support includes a central cylindrical section, a conical section, and a cylindrical connecting section arranged concentrically around an axis. The diameter of the central cylindrical section is larger than the diameter of the cylindrical connecting section, and the conical section connects the central cylindrical section and the cylindrical connecting section. Optionally, a portion of the connecting rod is located in the cylindrical joint section, and another portion is located in the conical section; a portion of the transition mesh portion is located in the conical section, and another portion is located in the central cylindrical section; the end of the first mesh near the connecting rod is located in the conical section, and the end of the first mesh near the central mesh portion is located in the central cylindrical section. Optionally, the first mesh is located in the first part of the tapered segment and has a first axial length, and the first mesh is located in the second part of the central cylindrical segment and has a second axial length, the second axial length being greater than the first axial length.

23. A stent, characterized in that, The stent is used to accommodate the impeller of the interventional blood pump, and the stent is operably switchable between a radially folded state and a radially unfolded state; When the support is unfolded into a plane, the support includes a central mesh section, a transition mesh section, and a connecting rod section, with the transition mesh section connecting the central mesh section and the connecting rod section. The transition mesh portion includes a first mesh; the first mesh has a first mesh edge and a second mesh edge disposed opposite to each other, the first mesh edge includes at least one first support intersection point and at least two first support units divided by at least one first support intersection point; there is a line connecting the first support intersection point and a first position point within the second mesh edge along a branch direction, the branch direction being one of the extension directions of each support edge of the second mesh, and no support units are provided on the branch path along the connecting line within the first mesh; The transition mesh section also has a second support column intersection point located in the same axial position as the first position point, and the number of support column units connected to the second support column intersection point is greater than or equal to the number of support column units connected to the first position point.

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