Anchoring device and blood pump system

Abstract

The invention provides an anchoring device and a blood pump system, the blood pump system comprises a blood pump, a conveying device and an anchoring device, and the conveying device is used for conveying the anchoring device and the blood pump. The anchoring device comprises an inner-layer support and an outer-layer support. Each of the inner-layer stent and the outer-layer stent has an expanded state and a compressed state; in the expansion state, the outer-layer support is used for being anchored in the target pipeline through the radial expansion force of the outer-layer support, and the inner-layer support is used for clamping and fixing the blood pump. The inner-layer support of the anchoring device can fix the blood pump after the blood pump is implanted, so that the swing amplitude of the blood pump during operation is limited, and the working stability and reliability of the blood pump are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an anchoring device and a blood pump system. Background Art

[0002] Artificial heart is referred to as "blood pump". The blood pump is used to do work on the blood to enhance the blood's ability to flow. Blood pumps are divided into implantable blood pumps and extracorporeal blood pumps. Among them, implantable blood pumps can be implanted in the patient's body. When actually implanted, the blood pump usually needs to be suspended in the aorta through a fixing device to do work on the blood flowing through the aorta, thereby assisting the human body's blood circulation in the short or long term.

[0003] Reference Figure 1 In the prior art, the fixing device generally includes a mesh support 100 and a pump body 200. The mesh support 100 is connected to the head end of the pump body 200 along its own radial direction, and the tail end of the pump body 200 is in a free state. In this way, the pump body 200 can always be located at the center of the blood vessel wall after being connected to the mesh support 100, but the tail end 300 of the pump body 200 is not fixed, and the tail end 300 is easier to deflect and swing when the pump body 200 is working.

[0004] The swinging of the tail end 300 of the pump body 200 will, on the one hand, reduce the stability of blood flow, thereby affecting the blood pumping effect of the pump body 200; on the other hand, the pump body 200 is more likely to rub and collide with the blood vessel wall during the deflection and swinging process, thereby posing the risk of damaging the blood vessel wall. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide an anchoring device and a blood pump system, which can fix the blood pump after the blood pump is implanted to limit the swing amplitude of the blood pump during operation and ensure the stability and reliability of the blood pump.

[0006] To achieve the above-mentioned purpose, the present invention provides an anchoring device for anchoring a blood pump in a target pipeline, which includes an inner layer stent and an outer layer stent; the inner layer stent and the outer layer stent both have an expanded state and a compressed state; in the expanded state, the outer layer stent is used to anchor in the target pipeline through its own radial expansion force, and the inner layer stent is used to clamp and fix the blood pump.

[0007] Optionally, in the expanded state, the inner layer stent has a accommodating space for placing the blood pump.

[0008] Optionally, the inner layer support includes a plurality of limit rods, each of which is connected to the outer layer support, and all of the limit rods are spaced apart in the circumferential direction of the outer layer support; all of the limit rods are used to enclose and form the accommodating space, and are also used to clamp and fix the blood pump.

[0009] Optionally, the outer layer stent includes a stent body, and a fixing portion through which the inner layer sheath tube can pass is disposed at the proximal end of the stent body.

[0010] Optionally, at least part of the inner layer support is arranged inside the outer layer support; one end of each of the limiting rods is connected to the fixing portion, and the other end of each of the limiting rods is a free end.

[0011] Optionally, the limiting rod includes an arc segment and an extension segment, one end of the arc segment is connected to the fixed portion, and the other end is connected to the extension segment; all the extension segments form a trumpet shape opening toward the distal end, and all the arc segments and all the extension segments together enclose the accommodating space.

[0012] Optionally, the fixing portion is a first annular structure, the axis of the first annular structure coincides with the axis of the outer layer stent, and in an expanded state, the outer diameter of the first annular structure is smaller than the outer diameter of the stent body.

[0013] Optionally, the inner layer bracket is arranged outside the bracket body of the outer layer bracket, and the proximal end of the bracket body is formed by multiple tail end rods surrounding along the circumferential direction, the proximal end of each tail end rod is connected to the fixed part, and each limiting rod is connected to the fixed part, and all the tail end rods and all the limiting rods are used to jointly enclose the accommodating space.

[0014] Optionally, the fixing portion is a plurality of positioning plates, all of which are spaced apart and distributed along the circumference of the outer layer support, and one end of each of the limiting rods is connected to a corresponding one of the positioning plates.

[0015] Optionally, the anchoring device further includes a plurality of connecting rods, all of which are spaced apart along the circumference of the outer layer support, one end of each connecting rod is connected to the outer layer support, and the other end is connected to a corresponding one of the limiting rods.

[0016] Optionally, the inner layer support further comprises a second annular structure, one end of each of the limiting rods away from the connecting rod is connected to the second annular structure, and the distal end of the second annular structure is used to be connected to the proximal end of the blood pump;

[0017] All the ends of the limit rods away from the connecting rods can be moved toward the distal end of the outer layer bracket so that the second annular structure is located at the distal end of the limit rods; all the ends of the limit rods away from the connecting rods can also be moved toward the proximal end of the outer layer bracket so that the blood pump is fixed in the accommodating space formed by all the limit rods; the outer layer bracket is used to anchor the blood pump in the target pipeline after the blood pump is fixed in the accommodating space.

[0018] Optionally, the fixing portion is a third annular structure, the second annular structure is located at a distal end of the third annular structure, and an axis of the second annular structure coincides with an axis of the third annular structure.

[0019] Optionally, in the expanded state, the outer diameters of multiple sections of the stent body along its own axial direction are different.

[0020] Optionally, the outer layer stent also includes a support rod, one end of which is connected to the stent body and the other end is a free end; the maximum outer diameter of the support rod is larger than the maximum outer diameter of the stent body; the support rod is used to abut against the target pipeline and form an anchor point after the stent body is expanded.

[0021] Optionally, the stent body includes one or more annular stent segments; the support rod is connected to the distal end of the annular stent segment; the proximal end of the stent body is formed by a plurality of tail end rods circumferentially surrounded, and the tail end rods are connected to the proximal end of the annular stent segment to form one or more connection points.

[0022] Optionally, there are multiple annular bracket segments, and the multiple annular bracket segments are connected in sequence in the axial direction of the outer bracket; the support rod is connected to the farthest annular bracket segment, and the tail end rod is connected to the nearest annular bracket segment.

[0023] To achieve the above objectives, the present invention also provides a blood pump system, comprising a blood pump, a conveying device and any one of the anchoring devices described above, wherein the conveying device is used to convey the anchoring device and the blood pump, and is also used to control the connection or separation of the blood pump and the inner layer bracket of the anchoring device.

[0024] Optionally, the delivery device comprises an inner sheath tube and an outer sheath tube which are slidably connected, the outer sheath tube is used to be sleeved outside the inner sheath tube; the inner sheath tube is used to be connected to the blood pump;

[0025] The inner sheath is used to drive the blood pump to move along its own axial direction so as to connect or separate the blood pump from the inner stent; the outer sheath is used to move relative to the inner sheath so as to compress or release the anchoring device.

[0026] Optionally, the blood pump forms point contact with the inner layer support when being fixed.

[0027] Optionally, the outer layer stent includes a cylindrical stent body, a fixing portion is provided at the proximal end of the stent body, and the inner layer sheath is used to movably pass through the fixing portion from the proximal end of the anchoring device, and is used to connect with the blood pump after passing through the fixing portion;

[0028] After the blood pump is located at the distal end of the anchoring device, the outer sheath can move distally relative to the inner sheath so that the anchoring device is compressed in the cavity formed by the outer sheath and the inner sheath; the outer sheath can also move proximally relative to the inner sheath to release the compression of the anchoring device, thereby changing the anchoring device from a compressed state to an expanded state.

[0029] Optionally, when the blood pump is located at the distal end of the anchoring device and after the anchoring device is compressed in the cavity, the outer diameter of the outer sheath is not greater than the outer diameter of the blood pump.

[0030] Optionally, the delivery device further comprises a pull wire, the inner sheath tube has insertion holes arranged circumferentially, one end of the pull wire is connected to the fixing portion, and the other end passes through the insertion hole and extends to the proximal ends of the inner sheath tube and the outer sheath tube.

[0031] Optionally, the delivery device further comprises an intermediate sheath tube, one end of which is connected to the fixing portion, and the other end of which passes through the outer sheath tube and extends outside the body, and the intermediate sheath tube is located between the inner sheath tube and the outer sheath tube.

[0032] As described above, the present invention provides an anchoring device and a blood pump system, wherein the anchoring device is used to anchor the blood pump in a target pipeline, and comprises an inner layer stent and an outer layer stent; the inner layer stent and the outer layer stent both have an expanded state and a compressed state; in the expanded state, the outer layer stent is used to anchor in the target pipeline through its own radial expansion force, and the inner layer stent is used to clamp and fix the blood pump.

[0033] The anchoring device provided by the present invention adopts a double-layer structural design, wherein, after the outer stent in the expanded state is fixed in the target pipeline, the inner stent can fix the blood pump to limit the swing amplitude of the blood pump during operation, so that the blood pump is not easy to deflect and move relative to the outer stent during operation. Such a configuration can, on the one hand, prevent the blood pump from rubbing and colliding with the blood vessel wall during operation, thereby avoiding damage to the blood vessel wall; on the other hand, it can also avoid the blood pump from interfering with the blood in the target pipeline and causing unstable blood flow, thereby ensuring the stability and reliability of the blood pump operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a usage scenario of a mesh support and a pump body in the prior art;

[0035] Figure 2 It is a structural schematic diagram of the blood pump system in the preferred embodiment 1 of the present invention, wherein the anchoring device is in an expanded state;

[0036] Figure 3It is a structural schematic diagram of the anchoring device in the expanded state in the first preferred embodiment of the present invention;

[0037] Figure 4 It is a front view structural schematic diagram of the anchoring device in the expanded state in the preferred embodiment 1 of the present invention;

[0038] Figure 5 It is a partial structural schematic diagram of the anchoring device, the blood pump and the conveying device in the preferred embodiment 1 of the present invention, wherein the blood pump is fixed in the anchoring device;

[0039] Figure 6 It is a schematic structural diagram of an anchoring device in an expanded state in another preferred embodiment of the present invention;

[0040] Figure 7 It is a partial structural schematic diagram of an anchoring device, a blood pump and a conveying device in another preferred embodiment of the present invention, wherein the blood pump is fixed in the anchoring device;

[0041] Figure 8 It is a partial structural schematic diagram of an anchoring device and a conveying device in another preferred embodiment of the present invention;

[0042] Fig. 9 It is a structural schematic diagram of a conveying device in a preferred embodiment 1 of the present invention;

[0043] Fig.10 This is a schematic diagram of a use scenario of the blood pump system in a target pipeline in a preferred embodiment 1 of the present invention, wherein the anchoring device is in a compressed state and the blood pump is located at the distal end of the anchoring device;

[0044] Fig.11 This is a schematic diagram of a use scenario of the blood pump system in a target pipeline in a preferred embodiment 1 of the present invention, wherein the anchoring device is in an expanded state and the blood pump is located at the distal end of the anchoring device;

[0045] Fig.12 This is a schematic diagram of a use scenario of the blood pump system in a target pipeline in a preferred embodiment 1 of the present invention, wherein the anchoring device is in an expanded state and the blood pump is fixed in the anchoring device;

[0046] Fig.13 It is a structural schematic diagram of the anchoring device in the expanded state in the second preferred embodiment of the present invention;

[0047] Fig.14 It is a front view structural schematic diagram of the anchoring device in the expanded state in the second preferred embodiment of the present invention;

[0048] Fig.15 It is a schematic structural diagram of an anchoring device in an expanded state in another preferred embodiment of the present invention;

[0049] Fig.16It is a partial structural schematic diagram of the anchoring device, the blood pump and the conveying device in the second preferred embodiment of the present invention, wherein the blood pump is fixed in the anchoring device;

[0050] Fig.17 It is a partial structural schematic diagram of the blood pump system in the second preferred embodiment of the present invention, wherein the blood pump is fixed in the anchoring device;

[0051] Fig.18 It is a partial structural schematic diagram of the conveying device in the second preferred embodiment of the present invention;

[0052] Fig.19 This is a schematic diagram of a use scenario of the blood pump system in the target pipeline in the second preferred embodiment of the present invention, wherein the anchoring device is in a compressed state and the blood pump is located at the distal end of the anchoring device;

[0053] Fig. 20 This is a schematic diagram of a use scenario of the blood pump system in the target pipeline in the second preferred embodiment of the present invention, wherein the anchoring device is in an expanded state and the blood pump is located at the distal end of the anchoring device;

[0054] Fig.21 This is a schematic diagram of a usage scenario of the blood pump system in the target pipeline in the second preferred embodiment of the present invention, wherein the anchoring device is in an expanded state and the blood pump is fixed in the anchoring device.

[0055] In the figure: mesh support 100; pump body 200; tail end 300;

[0056] Anchoring device 1; inner layer support 11; accommodating space 111; limiting rod 112; arc section 1121; extension section 1122; second annular structure 113; outer layer support 12; support body 121; annular support section 1211; tail end rod 122; fixing part 123, 126; hanging ears 1231, 1261; positioning piece 124; support rod 125; connecting rod 13; blood pump 2; target pipeline 3; conveying device 4; inner layer sheath 41; loading section 411; main body section 412; insertion hole 413; outer layer sheath 42; pull wire 43. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0058] The terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. The term "proximal end" generally refers to the end close to the operator; the "distal end" is the end opposite to the "proximal end", and generally refers to the end away from the operator.

[0059] <Example 1>

[0060] Reference Figure 2 As shown, a preferred embodiment of the present invention provides an anchoring device 1 for anchoring a blood pump 2 in a target pipeline 3 (see Figure 10 to Figure 12 Specifically, the blood pump 2 can be anchored at a predetermined position on the wall of the target pipeline 3 by the anchoring device 1, so that the blood pump 2 can work on the blood in the target pipeline 3 at the predetermined position in the target pipeline and enhance the flow capacity of the blood, thereby assisting in maintaining blood circulation in the patient's body.

[0061] It should be understood that the target conduit 3 refers to the blood vessel where the blood pump 2 needs to be implanted, and the target conduit 3 may also refer to a blood vessel model used for preoperative simulation. In this embodiment, the target conduit 3 is the abdominal aorta, but it is not limited thereto. Taking the abdominal aorta as an example, during the operation, the operator can suspend the blood pump 2 in the abdominal aorta through the anchoring device 1, and then the blood pump 2 performs work on the blood flowing through the abdominal aorta.

[0062] See also Figure 3 As shown, the anchoring device 1 includes an inner layer support 11 and an outer layer support 12. The anchoring device 1 has an expanded state and a compressed state, and can be switched between the expanded state and the compressed state. Specifically, the anchoring device 1 can be compressed and implanted into the human body and transported to a predetermined position of the target pipeline 3, at which time the inner layer support 11 and the outer layer support 12 are both in a compressed state; the anchoring device 1 can also be released from the constraint and expanded after reaching the predetermined position, at which time the inner layer support 11 and the outer layer support 12 are both in an expanded state.

[0063] It should be known that the expansion of the inner layer support 11 and the outer layer support 12 refers to the expansion outward along their own radial direction, and the radial dimensions of the inner layer support 11 and the outer layer support 12 increase at this time; similarly, the compression of the inner layer support 11 and the outer layer support 12 refers to the contraction inward along their own radial direction, so that the radial dimensions of the inner layer support 11 and the outer layer support 12 decrease at this time.

[0064] In the expanded state, the outer stent 12 is used to anchor in the target pipeline 3 through its own radial expansion force, so that the inner stent 11 and the outer stent 12 are fixed at the predetermined position of the target pipeline 3. In the expanded state, the inner stent 11 is used to clamp and fix the blood pump 2 to prevent the blood pump 2 from moving significantly relative to the outer stent 12. The movement includes but is not limited to displacement and / or deflection. It should be further explained that the inner stent 11 and the outer stent 12 can be connected to each other, such as Figure 2 As shown, the inner layer support 11 and the outer layer support 12 are both fixed on the fixing part 123 to realize the connection between the inner layer support 11 and the outer layer support 12, the fixing part 123 is sleeved on the inner layer sheath 41, and the inner layer sheath 41 can movably pass through the fixing part 123; the inner layer support 11 and the outer layer support 12 can be separated from each other, the proximal end of the inner layer support 11 is provided with a fixing part, and the proximal end of the outer layer support 12 is provided with another fixing part, the fixing part of the inner layer support 11 and the fixing part of the outer layer support 12 are separated from each other and are both sleeved on the inner layer sheath 41, and the inner layer sheath 41 can movably pass through the fixing part of the inner layer support 11 and the fixing part of the outer layer support 12.

[0065] The anchoring device 1 of the present invention adopts a double-layer structural design, wherein, after the outer layer support 12 in the expanded state is fixed in the target pipeline 3, the inner layer support 11 can fix the blood pump 2 to limit the swing amplitude of the blood pump 2 during operation, so that the blood pump 2 is not easy to deflect and move relative to the outer layer support 12 during operation. Such a configuration can, on the one hand, prevent the blood pump 2 from rubbing and colliding with the blood vessel wall during operation, thereby avoiding damage to the blood vessel wall; on the other hand, it can also prevent the blood pump 2 from interfering with the blood in the target pipeline 3 and causing unstable blood flow, thereby ensuring the stability and reliability of the blood pump 2.

[0066] like Figure 2 As shown, a preferred embodiment of the present invention also provides a blood pump system, including an anchoring device 1, a blood pump 2 and a conveying device 4. The conveying device 4 is used to convey the anchoring device 1 and the blood pump 2, and the conveying device 4 is also used to control the connection or separation of the blood pump 2 with the inner layer support 11 of the anchoring device 1. In more detail, the conveying device 4 is used to control the compression or release of the anchoring device 1, and to drive the blood pump 2 to move so that the blood pump 2 is connected to or separated from the inner layer support 11. The blood pump system provided by the present invention enables the anchoring device 1 and the blood pump 2 to be recovered and withdrawn from the body through the conveying device 4 after the operation of the blood pump 2 is completed, thereby avoiding the anchoring device 1 from being left in the target pipeline 3 after surgery, thereby reducing the risk of vascular stenosis and thrombosis.

[0067] The implantation and fixation process of the blood pump 2 is as follows: after the blood pump 2 moves toward the distal end and is located at the distal end of the outer stent 11 and the inner stent 11, that is, after the blood pump 2 is placed outside the inner stent 11, both the inner stent 11 and the outer stent 12 can be compressed and implanted into the target pipeline 3 after compression. After the inner stent 11 and the outer stent 12 reach the position of the target pipeline 3 and are released, both the inner stent 11 and the outer stent 12 can be released from compression and expanded, the expanded outer stent 11 can be anchored in the target pipeline 3, and the blood pump 2 can be moved into and clamped and fixed in the expanded inner stent 11.

[0068] The delivery process of the blood pump 2 is as follows: first, the delivery device 4 loads the anchoring device 1 and the blood pump 2 outside the body and compresses the anchoring device 1. Then, the delivery device 3 is delivered into the human body, and then the anchoring device 1 and the blood pump 2 are delivered to the target pipeline 3. When the anchoring device 1 reaches the predetermined position of the target pipeline 3, the delivery device 4 releases the anchoring device 1 to expand the inner layer support 11 and the outer layer support 12. Then, the delivery device 4 drives the blood pump 2 to move proximally and fix it with the inner layer support 11. At this time, the outer layer support 12 is attached to and anchored with the inner wall of the target pipeline 3. When the blood pump 2 needs to be withdrawn, the delivery device 4 drives the blood pump 2 to move distally to separate the blood pump 2 from the inner layer support 11. After the blood pump 2 is separated from the inner layer support 11, it enters the delivery device 4 again. Subsequently, the delivery device 4 compresses the anchoring device 1 again. Finally, the blood pump 2 and the anchoring device 1 are withdrawn from the patient's body through the delivery device 4.

[0069] In one example, the inner stent 11 and the outer stent 12 can be compressed under external force and can expand automatically after the compression is released. The inner stent 11 and the outer stent 12 are preferably made of superelastic materials, and the materials for making the inner stent 11 and the outer stent 12 include but are not limited to metal materials (such as nickel-titanium alloy) or polymer materials, so as to achieve the anchoring of the outer stent 12 in the target pipeline 3 and the separation from the target pipeline 3.

[0070] Reference Figure 3 and Figure 4 As shown, in the expanded state, the inner layer stent 11 has a receiving space 111 for placing the blood pump 2 , and the minimum inner diameter of the receiving space 111 matches the outer diameter of the blood pump 2 .

[0071] In one example, the blood pump 2 can be moved into and clamped in the accommodation space 111. Specifically, the blood pump 2 is used to be driven by the conveying device 4 to be moved into and fixed in the accommodation space 111 formed by the inner layer stent 11 in the expanded state, and the blood pump 2 is also used to be driven by the conveying device 4 to move out of the accommodation space 111 to separate from the inner layer stent 11.

[0072] Reference Figure 4As shown, in a preferred embodiment, the inner layer support 11 includes a plurality of limiting rods 112, the limiting rods 112 are preferably elastic, and each limiting rod 112 is connected to the outer layer support 12. All limiting rods 112 are arranged at intervals in the circumferential direction of the outer layer support 12, and are used to enclose and form the accommodating space 111; all limiting rods 112 are also used to clamp and fix the blood pump 2.

[0073] Since the limiting rods 112 are elastic and easy to deform, all the limiting rods 112 can move along their own radial direction when the blood pump 2 enters the accommodating space 111 to allow the blood pump 2 to enter. At this time, all the limiting rods 112 can provide anchoring force to the blood pump 2 to jointly fix the blood pump 2 in the accommodating space 111. The setting of the limiting rods 112 can make it easier for the blood pump 2 to move into or out of the accommodating space 111, thereby facilitating the fixation or separation of the blood pump 2 and the inner layer support 11.

[0074] Further preferably, each limiting rod 112 extends substantially along the axial direction of the blood pump, one end of each limiting rod 112 is connected to the outer support 12, and the other end of each limiting rod 112 is a free end.

[0075] The present application does not limit the number of the limiting rods 112 . In the present embodiment, there are 6 limiting rods 112 . In other embodiments, there may be 2, 3 or more limiting rods 112 .

[0076] In other embodiments, the inner support 11 may also be a mesh structure or a thin-wall structure. In this case, the mesh structure or the thin-wall structure can enclose a receiving space 111 and can be deformed to allow the blood pump 2 to move in or out.

[0077] Preferably, the blood pump 2 forms point contact with the inner layer support 11 when fixed, which can reduce the contact area between the inner layer support 11 and the blood pump 2, reduce the risk of thrombus formation at the fixed position of the inner layer support 11 and the blood pump 2, and further improve the safety of the operation of the blood pump 2.

[0078] Reference Figure 4 As shown, in a specific embodiment, the limiting rod 112 includes an arc segment 1121, and the arc segment 1121 protrudes in a direction close to or away from the outer layer support 12. After the blood pump 2 enters the accommodating space 111 surrounded by a plurality of limiting rods 112, the blood pump 2 only contacts one or several fixed points on the arc segment 1121 closest to the blood pump 2, so that the blood pump 2 forms a point contact with the inner layer support 11.

[0079] More preferably, the limiting rod 112 further includes an extension section 1122, one end of which is connected to the arc section 1121, and the other end is a free end. All the extension sections 1122 form a trumpet shape opening toward the distal end of the outer layer support 12, and all the arc sections 1121 and all the extension sections 1122 together enclose the accommodation space 111. In this way, the inclined extension sections 1122 can form a guide surface, thereby facilitating the blood pump 2 to slide into the accommodation space 111.

[0080] In other embodiments, one end of the extension segment 1122 is connected to the arc segment 1121 , and the other end of the extension segment 1122 may also be connected to the outer layer support 12 , thereby increasing the resistance of the inner layer support 11 to the swing of the blood pump 2 .

[0081] Continue to refer to Figure 4 The outer layer stent 12 includes a cylindrical stent body 121. The stent body 121 includes a mesh structure, which can be a mesh structure formed by weaving multiple silk threads, or a mesh structure formed by fixing after laser cutting.

[0082] In a preferred example, the proximal end of the stent body 121 is formed by a plurality of tail rods 122 surrounding the circumference, and a fixing portion 123 through which the inner sheath tube can pass is provided at the proximal end of the stent body 121. The proximal end of each tail rod 122 is connected to the fixing portion 123, so that the outer stent 12 can form a structure with one end open.

[0083] As a preferred embodiment, one end of each limiting rod 112 is connected to the fixing part 123, and at least part of the inner layer bracket 11 is arranged inside the outer layer bracket 12. At this time, the inner layer bracket 11 and the outer layer bracket 12 are both fixed on the fixing part 123 to achieve the fixation of the relative position of the inner layer bracket 11 and the outer layer bracket 12.

[0084] In this embodiment, the inner layer support 11 is located inside the outer layer support 12. In the axial direction of the support body 121, the length of the limiting rod 112 in its own extension direction does not exceed the blood inlet of the blood pump 2. In this way, the inner layer support 11 can fix the head end of the blood pump 2 while avoiding affecting the blood flow at the blood inlet (the tail end of the blood pump 2).

[0085] Reference Figure 4 As shown, in this embodiment, the fixing portion 123 is a first annular structure, and the axis of the first annular structure coincides with the axis of the outer layer stent 12. In the expanded state, the outer diameter of the first annular structure is smaller than the outer diameter of the stent body 121. With such a configuration, when the blood pump 2 is fixed in the accommodating space 111 of the inner layer stent 11, the blood pump 2 can be located on the axis of the outer layer stent 12, that is, the blood pump 2 can be located at the center of the outer layer stent 12, so as to prevent the blood pump 2 from deflecting and rubbing against the blood vessel wall to the greatest extent, thereby ensuring the safety of the blood pump 2.

[0086] Reference Figure 5 As shown, in a preferred embodiment, the tail end rod 122 is a straight rod, and the tail end rod 122 is arranged outside the limiting rod 112 , and the blood pump 2 can enter and be fixed in the accommodating space 111 formed by the plurality of limiting rods 112 .

[0087] Reference Figure 6 In an exemplary embodiment, the shape of the tail rod 122 may be "Y-shaped", that is, the tail rod 122 is composed of three rods, and one end of the three rods intersects. Among them, two rods are used to connect with the mesh structure of the stent body 121, and the remaining rod is used to connect with the fixing part 123. In other words, the distal end of each tail rod 122 has two connection points with the mesh structure of the stent body 121, and the proximal end of each tail rod 122 has only one connection point with the fixing part 123. In this way, the number of tail rods 122 can be reduced to reduce the difficulty of compressing and expanding the outer layer stent 12.

[0088] Reference Figure 7 As shown, in another preferred embodiment, the proximal end of each tail end rod 122 is connected to the fixing portion 123, and each limiting rod 112 is connected to the fixing portion 123. The shape of the tail end rod 122 is preferably a curve, and all the tail end rods 122 and all the limiting rods 112 are used to jointly enclose the accommodating space 111. That is to say, both the tail end rod 122 and the limiting rod 112 can be used to fix and limit the blood pump 2.

[0089] Continue to refer to Figure 7 In one example, the tail end rod 122 and the limiting rod 112 have the same or similar shapes, and the tail end rod 122 and the limiting rod 112 are arranged in sequence in the circumferential direction of the outer layer support 12. The fixing portion 123 is used to be fixed to the proximal ends of the tail end rod 122 and the limiting rod 112, and the blood pump 2 can be moved into or out of the accommodating space 111 enclosed by the tail end rod 122 and the limiting rod 112, so that the blood pump 2 can be firmly fixed, and the deflection of the blood pump 2 during operation can be further prevented.

[0090] Reference Figure 8 As shown, in another preferred embodiment, the fixing portion 123 is a plurality of positioning pieces 124, all of which are spaced apart along the circumference of the outer stent 12, and one end of each limiting rod 112 is connected to a corresponding positioning piece 124. The distal end of each positioning piece 124 is preferably connected to the proximal end of one or more tail rods 122. At least part of the positioning pieces 124 can be connected to the delivery device 4. In this way, when the anchoring device 1 is severely endothelialized and difficult to remove, the connection between the positioning piece 124 and the delivery device 4 can be cut off to allow the anchoring device 1 to remain in the patient's body.

[0091] In a specific embodiment, in the expanded state, the outer diameters of multiple sections of the stent body 121 along its own axial direction are different, that is, the stent body 121 is set as a variable diameter structure along its own axis. In this way, when the stent body 121 is expanded and fixed in the target pipeline 3, only a part of the stent body 121 contacts the inner wall of the target pipeline 3, thereby reducing the contact area between the stent body 121 and the target pipeline 3, avoiding large-area endothelialization when the outer layer stent 12 is implanted for a long time, reducing the recovery force when the outer layer stent 12 is recovered, avoiding damage to the target pipeline 3 during recovery as much as possible, and reducing the risk of the outer layer stent 12 being unable to be removed.

[0092] In another specific embodiment, the stent body 121 may also be configured as a cylindrical structure along its own axis to increase the radial support force of the stent body 121 and prevent the stent body 121 from being deformed or damaged after implantation.

[0093] Preferably, the outer stent 12 forms point contact with the target vessel 3 when being anchored, which can reduce the contact area between the outer stent 12 and the target vessel 3, thereby reducing the area of ​​endothelialization after the outer stent 12 and the target vessel 3 are anchored, facilitating the separation of the outer stent 12 from the target vessel 3, and also reducing the risk of vascular stenosis caused by tearing the inner wall of the target vessel 3 when the outer stent 12 is retrieved.

[0094] Reference Figure 4 As shown, as a preferred example, the outer layer stent 12 also includes a support rod 125, one end of the support rod 125 is connected to the stent body 121, and the other end is a free end. The maximum outer diameter of the support rod 125 is greater than the maximum outer diameter of the stent body 121. The support rod 125 is used to abut against the target pipeline 3 after the stent body 121 is expanded and form an anchor point (not shown), while the stent body 121 does not abut against the inner wall of the target pipeline 3. At this time, the expanded outer layer stent 12 forms a point contact with the target pipeline 3, thereby facilitating the anchoring and evacuation of the outer layer stent 12.

[0095] Continue to refer to Figure 4 The stent body 121 includes one or more annular stent segments 1211 extending along the circumference of the outer stent 12 , and the axis of the annular stent segment 1211 preferably coincides with the axis of the blood pump 2 . The support rod 125 is connected to the distal end of the annular stent segment 1211 .

[0096] Reference Figure 4 and Figure 5As shown, there are multiple annular stent segments 1211, and the multiple annular stent segments 1211 are sequentially connected in the axial direction of the outer stent 12. In this embodiment, the annular stent segment 1211 is a sawtooth structure extending along the circumference of the outer stent 12. In other embodiments, the annular stent segment 1211 may also be an arc structure, a wavy structure, or other types of structures extending along the circumference of the outer stent 12.

[0097] The present application does not limit the connection position of the support rod 125 and the stent body 121, and the support rod 125 can be connected to any position of the stent body 121. Preferably, the support rod 125 is connected to the most distal annular stent segment 1211. For example, the support rod 125 can be connected to the distal end of the most distal annular stent segment 1211 (refer to Figure 4 ), the support rod 125 can also be connected to the proximal end of the most distal annular stent segment 1211 (refer to Figure 6 ).

[0098] As a preferred embodiment, the tail rod 122 is connected to the proximal annular stent segment 1211, and the tail rod 122 and the proximal end of the annular stent segment 1211 form a connection point (refer to Figure 5 ), or the tail rod 122 and the proximal end of the annular stent segment 1211 form multiple connection points (refer to Figure 6 ).

[0099] Reference Fig. 9 and Fig.10 As shown, the delivery device 4 includes an inner sheath tube 41 and an outer sheath tube 42 which are slidably connected, and the outer sheath tube 42 is used to be sleeved on the outside of the inner sheath tube 41. The inner sheath tube 41 is used to connect with the blood pump 2. The inner sheath tube 41 is used to drive the blood pump 2 to move along its own axial direction, so that the blood pump 2 is connected to or separated from the inner support 11, that is, the blood pump 2 is moved into or out of the accommodating space 111. The outer sheath tube 42 is used to move relative to the inner sheath tube 41 to compress or release the anchoring device 1.

[0100] Reference Fig.11 As shown, combined with Figure 4 The inner sheath 41 is used to movably pass through the fixing portion 123 from the proximal end of the anchoring device 1, and is used to connect with the blood pump 2 after passing through the fixing portion 123. After the anchoring device 1 is expanded, the operator can drive the blood pump 2 to connect or separate from the anchoring device 1 by moving the inner sheath 41.

[0101] After the blood pump 2 is located at the distal end of the anchoring device 1, the outer sheath 42 can move distally relative to the inner sheath 41 so that the anchoring device 1 is compressed in the cavity formed by the outer sheath 42 and the inner sheath 41; the outer sheath 42 can also move proximally relative to the inner sheath 41 to release the compression of the anchoring device 1, thereby changing the anchoring device 1 from a compressed state to an expanded state.

[0102] Continue to refer to Fig. 9 The inner sheath 41 includes a loading section 411 and a main section 412 which are connected in sequence along the axial direction from the distal end to the proximal end. The axes of the loading section 411 and the main section 412 coincide with each other, and the outer diameter of the loading section 411 is smaller than the radial dimension of the main section 412. The distal end of the loading section 411 passes through the fixing portion 123 from the proximal end and is connected to the blood pump 2. Fig.10 and Fig.11 As shown, the inner sheath 41 can drive the blood pump 2 to move toward the distal end, so that the anchoring device 1 is sleeved outside the loading section 411, and the blood pump 2 is located at the distal end of the anchoring device 1. Fig.12 The inner sheath 41 can also drive the blood pump 2 to move toward the proximal end so that the anchoring device 1 is located outside the blood pump 2 and fixes the blood pump 2. At this time, the anchoring device 1 is located at the distal end of the loading section 411.

[0103] Preferably, when the blood pump 2 is located at the distal end of the anchoring device 1 and the anchoring device 1 is compressed in the cavity, the outer diameter of the outer sheath 42 is not greater than the outer diameter of the blood pump 2. With such a structure, after the anchoring device 1 is compressed, the blood pump 2 and the anchoring device 1 can be sequentially delivered to a predetermined position in the target pipeline 3, and the anchoring device 1 is restrained in the outer sheath 42. At this time, the maximum size of the entire blood pump system is the outer diameter of the blood pump 2, so that the cross-sectional area of ​​the entire blood pump system can be reduced, and damage to the target pipeline 3 during delivery of the blood pump system can be avoided, so as to reduce the occurrence of vascular complications.

[0104] Reference Figures 9 to 12 As shown, the delivery device 4 also includes a pull wire 43, and the inner sheath 41 has circumferentially arranged insertion holes 413, one end of the pull wire 43 is connected to the fixing portion 123 of the anchoring device 1, and the other end passes through the insertion hole 413 and extends to the proximal ends of the inner sheath 41 and the outer sheath 42.

[0105] Return to reference Figure 4 , and combined with Fig. 9 In this embodiment, the fixing portion 123 is provided with a hanging ear 1231 for passing the pull wire 43, and the main body section 412 is circumferentially arranged with insertion holes 413.

[0106] In one example, one end of the pull wire 43 is connected to the ear 1231, and the other end is inserted into the insertion hole 413 of the main body section 412 outside the loading section 411, and extends to the proximal end of the inner sheath 42 to be connected to an external device (such as an operating handle). The operator can drive the anchoring device 1 to move by pulling the pull wire 43.

[0107] In another example, the pull wire 43 can pass through the ear 1231, and both ends of the pull wire 43 can be inserted into the insertion hole 413 of the main body section 412 outside the loading section 411, and extend to the proximal end of the inner sheath tube 42 to connect with the external device. At this time, the operator can drive the anchoring device 1 to move by pulling the pull wire 43. When the anchoring device 1 needs to be left at the implanted position, one end of the pull wire 43 can be pulled to remove the pull wire 43 from the body.

[0108] The present application does not limit the material of the pull wire 43. The pull wire 43 can be made of metal materials such as stainless steel or nickel titanium wire, or can be made of polymer materials such as nylon, polyester or polypropylene. At the same time, the pull wire 43 can be connected to the anchor device 1 by welding, bonding or bundling.

[0109] In another preferred embodiment, the delivery device 4 also includes an intermediate sheath (unnumbered), one end of which is connected to the fixing portion 123 , and the other end passes through the outer sheath 42 and extends outside the body, and the intermediate sheath is located between the inner sheath 41 and the outer sheath 42 .

[0110] Furthermore, multiple development structures (not shown) may be distributed on the inner sheath 41 and the outer sheath 42, and the development structures are used to display the moving positions of the inner sheath 41 and the outer sheath 42 during movement. The operator can determine the stop positions of the inner sheath 41 and the outer sheath 42 during movement through the development structures to ensure that the operation can proceed smoothly.

[0111] In a non-limiting embodiment, the entire implantation process of the blood pump 2 includes:

[0112] Reference Fig.10 Before the blood pump 2 is implanted, the inner sheath 41 is pushed toward the distal end so that the blood pump 2 is located at the distal end of the anchoring device 1. The anchoring device 1 is compressed in the cavity (not shown) formed by the outer sheath 42 and the loading section 411, and the distal end of the outer sheath 42 is in contact with the proximal end of the blood pump 2.

[0113] Reference Fig.11 After the anchoring device 1 is implanted at the position of the target pipeline 3 , the outer sheath 42 is pulled to the proximal end of the anchoring device 1 , and the anchoring device 1 can be released from compression and expanded to its pre-compression size, so that the outer stent 12 is anchored on the target pipeline 3 .

[0114] Reference Fig.12The inner sheath 41 is pulled toward the proximal end until the blood pump 2 is fixed in the accommodating space 111 of the inner support 11 and abuts against the first annular structure. The relative positions of the inner sheath 41 and the outer sheath 42 are fixed to complete the entire delivery and release process of the blood pump 2.

[0115] After the blood pump 2 has worked in the target pipeline 3 for a period of time, the blood pump 2 needs to be recovered from the body. Fig.10 When the blood pump 2 is withdrawn, the inner sheath 41 and the outer sheath 42 are first released, and the inner sheath 41 is pushed toward the distal end, and the inner sheath 41 drives the blood pump 2 to move out of the inner support 11 until the proximal end of the anchoring device 1 is located at the connection between the loading section 411 and the main section 412 of the inner sheath 41. At this time, the blood pump 2 is located at the distal end of the anchoring device 1. The position of the inner sheath 41 is fixed, and then the outer sheath 42 is pushed toward the distal end to compress the anchoring device 1 into the outer sheath 42 until the anchoring device 1 is completely compressed into the cavity formed by the outer sheath 42 and the loading section 411. Finally, the anchoring device 1, the blood pump 2 and the conveying device 4 are withdrawn from the target pipeline 3 to complete the recovery process of the entire blood pump 2.

[0116] <Example 2>

[0117] For the sake of clarity, the fixing portion 126 of the second embodiment uses a different number from the fixing portion 123 of the first embodiment, but even if the numbers are different, for the same parts, the embodiment of the fixing portion 123 in the first embodiment is also applicable to the fixing portion 126 in the second embodiment. The following mainly describes only the differences from the first embodiment, and for the same parts, please refer to the first embodiment.

[0118] Reference Fig.13 and Fig.14 As shown, in a preferred embodiment, the inner layer support 11 includes a plurality of limit rods 112 and a second annular structure 113, the limit rods 112 are deformable bodies, all the limit rods 112 are spaced apart in the circumferential direction of the outer layer support 12, and the distal end of the second annular structure 113 is used to connect with the proximal end of the blood pump 2.

[0119] Continue to refer to Fig.13 and Fig.14 The anchoring device 1 further comprises a plurality of connecting rods 13, all of which are spaced apart along the circumference of the outer support 12, one end of each connecting rod 13 is connected to the outer support 12, and the other end is connected to a corresponding limiting rod 112. One end of each limiting rod 112 away from the connecting rod 13 is connected to the second annular structure 113.

[0120] The ends of all the limiting rods 112 away from the connecting rods 13 can move toward the distal end of the outer stent 12, so that the second annular structure 113 is located at the distal end of the limiting rods 112; the ends of all the limiting rods 112 away from the connecting rods 13 can also move toward the proximal end of the outer stent 12 until the limiting rods 112 are S-shaped and can provide anchoring force to the blood pump 2, so that the blood pump 2 is fixed in the accommodating space 111 enclosed by all the limiting rods 112 (refer to Fig.17 The outer support 12 is used to anchor the blood pump 2 in the target pipeline 3 after the blood pump 2 is fixed in the accommodating space 111 .

[0121] Reference Fig.15 As shown, in one embodiment, the number of the annular stent segment 1211 is one, in which case the connecting rod 13 is connected to the distal end of the annular stent segment 1211, and the tail rod 122 is connected to the proximal end of the annular stent segment 1211. Fig.13 As shown, in another embodiment, the number of the annular stent segments 1211 may also be 2 or more.

[0122] Reference Figure 13 to Figure 16 As shown, the fixing portion 126 is a third annular structure, the second annular structure 113 is located at the distal end of the third annular structure, and the axis of the second annular structure 113 coincides with the axis of the third annular structure. With such a configuration, the inner sheath 41 can pass through the third annular structure and the second annular structure 113 in sequence from the proximal end and be connected to the blood pump 2.

[0123] In this embodiment, the fixing portion 126 is provided with a hanging ear 1261 (see Fig.14 ), the main body section 412 is circumferentially arranged with insertion holes 413 (see Fig.18 One end of the pull wire 43 is connected to the hanging ear 1261 , and the other end of the pull wire 43 passes through the insertion hole 413 and extends to the proximal ends of the inner sheath tube 41 and the outer sheath tube 42 .

[0124] In a non-limiting embodiment, the implantation process of the blood pump 2 includes:

[0125] Reference Fig.19 As shown, before the blood pump 2 is implanted, the inner sheath 41 is first pushed toward the distal end, so that the inner sheath 41 drives the blood pump 2 to drive the second annular structure 113 to move toward the distal end, so that the limiting rod 112 extends in a direction away from the outer stent 12, until the second annular structure 113 is placed at the farthest end of the limiting rod 112, at which time at least part of the inner stent 11 is located outside the stent body 121 of the outer stent 12, and the blood pump 2 is placed outside the inner stent 11. Then the anchoring device 1 is compressed in the cavity (not shown) formed by the outer sheath 42 and the loading section 411, and the distal end of the outer sheath 42 is in contact with the proximal end of the blood pump 2, and then implanted into the body.

[0126] Reference Fig. 20 As shown, after the inner stent 11 and the outer stent 12 are able to reach the predetermined position of the target pipeline 3, the outer sheath 42 is pulled to the proximal end of the anchoring device 1, and the anchoring device 1 can be released from the constraint and expanded.

[0127] Reference Fig.21 As shown, the inner sheath 41 is pulled toward the proximal end, and the inner sheath 41 drives the blood pump 2 to drive the second annular structure 113 to move toward the proximal end, so that the limiting rod 112 is bent and folded, until the developing structure on the inner sheath 41 coincides with the second annular structure 113, at which time the inner support 11 is accommodated in the outer support 12, and the blood pump 2 is moved into and fixed in the accommodation space 111. The outer support 12 can be urged to continue to expand during the movement of the blood pump 2 into the accommodation space 111, until the outer support 12 is anchored on the target pipeline 3. The relative positions of the inner sheath 41 and the outer sheath 42 are fixed to complete the entire delivery and release process of the blood pump 2.

[0128] Continue to refer to Fig.19 When the blood pump 2 is withdrawn, the inner sheath 41 and the outer sheath 42 are first released, and the inner sheath 41 is pushed toward the distal end. The inner sheath 41 drives the blood pump 2 to drive the second annular structure 113 to move toward the distal end again until the second annular structure 113 is placed at the farthest end of the limit rod 112. The position of the inner sheath 41 is fixed, and then the outer sheath 42 is pushed toward the distal end to compress the anchoring device 1 into the outer sheath 42 until the anchoring device 1 is completely compressed into the cavity formed by the outer sheath 42 and the loading section 411. Finally, the anchoring device 1, the blood pump 2 and the conveying device 4 are withdrawn from the target pipeline 3 to complete the recovery process of the entire blood pump 2.

[0129] In summary, the present invention provides an anchoring device 1 and a blood pump system, wherein the anchoring device 1 adopts a double-layer structure design, wherein after the outer layer support 12 in the expanded state is fixed in the target pipeline 3, the inner layer support 11 can fix the blood pump 2 to limit the swing amplitude of the blood pump 2 during operation, so that the blood pump 2 is not easy to deflect and move relative to the outer layer support 12 during operation. Such a configuration can, on the one hand, prevent the blood pump 2 from rubbing and colliding with the blood vessel wall during operation, thereby avoiding damage to the blood vessel wall; on the other hand, it can also avoid the blood pump 2 from interfering with the blood in the target pipeline 3 and causing unstable blood flow, thereby ensuring the stability and reliability of the blood pump 2.

[0130] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. An anchoring device for anchoring a blood pump in a target pipeline, characterized in that: It comprises an inner layer support and an outer layer support; the inner layer support and the outer layer support both have an expanded state and a compressed state; in the expanded state, the outer layer support is used to be anchored in the target pipeline through its own radial expansion force, and the inner layer support is used to clamp and fix the blood pump.

2. The anchoring device according to claim 1, characterized in that: In the expanded state, the inner layer stent has a containing space for placing the blood pump.

3. The anchoring device according to claim 2, characterized in that: The inner layer support includes a plurality of limit rods, each of which is connected to the outer layer support, and all of the limit rods are arranged at intervals in the circumferential direction of the outer layer support; all of the limit rods are used to enclose and form the accommodating space, and are also used to clamp and fix the blood pump.

4. The anchoring device according to claim 3, characterized in that: The outer layer stent comprises a stent body, and a fixing portion through which the inner layer sheath tube can pass is arranged at the proximal end of the stent body.

5. The anchoring device according to claim 4, characterized in that: At least part of the inner layer support is arranged inside the outer layer support; one end of each of the limiting rods is connected to the fixing portion, and the other end of each of the limiting rods is a free end.

6. The anchoring device according to claim 5, characterized in that: The limiting rod includes an arc segment and an extension segment, one end of the arc segment is connected to the fixed portion, and the other end is connected to the extension segment; all the extension segments form a trumpet shape opening toward the distal end of the outer layer bracket, and all the arc segments and all the extension segments together enclose the accommodating space.

7. The anchoring device according to claim 4, characterized in that: The fixing portion is a first annular structure, the axis of the first annular structure coincides with the axis of the outer layer stent, and in an expanded state, the outer diameter of the first annular structure is smaller than the outer diameter of the stent body.

8. The anchoring device according to claim 4, characterized in that: The inner layer bracket is arranged outside the bracket body of the outer layer bracket, and the proximal end of the bracket body is formed by multiple tail end rods surrounding along the circumferential direction. The proximal end of each tail end rod is connected to the fixed part, and each limit rod is connected to the fixed part. All the tail end rods and all the limit rods are used to jointly enclose the accommodating space.

9. The anchoring device according to claim 4, characterized in that: The fixing portion is a plurality of positioning pieces, all of which are spaced apart and distributed along the circumference of the outer layer support, and one end of each of the limiting rods is connected to a corresponding one of the positioning pieces.

10. The anchoring device according to claim 4, characterized in that: It also includes a plurality of connecting rods, all of which are distributed at intervals along the circumference of the outer layer bracket, one end of each connecting rod is connected to the outer layer bracket, and the other end is connected to a corresponding one of the limiting rods.

11. The anchoring device according to claim 10, characterized in that: The inner layer support further comprises a second annular structure, one end of each of the limiting rods away from the connecting rod is connected to the second annular structure, and the distal end of the second annular structure is used to be connected to the proximal end of the blood pump; All the ends of the limit rods away from the connecting rods can be moved toward the distal end of the outer layer bracket so that the second annular structure is located at the distal end of the limit rods; all the ends of the limit rods away from the connecting rods can also be moved toward the proximal end of the outer layer bracket so that the blood pump is fixed in the accommodating space formed by all the limit rods; the outer layer bracket is used to anchor the blood pump in the target pipeline after the blood pump is fixed in the accommodating space.

12. The anchoring device according to claim 11, characterized in that The fixing portion is a third annular structure, the second annular structure is located at the distal end of the third annular structure, and the axis of the second annular structure coincides with the axis of the third annular structure.

13. The anchoring device according to claim 4, characterized in that: In the expanded state, the outer diameters of multiple sections of the stent body along its axial direction are different.

14. The anchoring device according to claim 4, characterized in that: The outer layer stent also includes a support rod, one end of which is connected to the stent body and the other end is a free end; the maximum outer diameter of the support rod is greater than the maximum outer diameter of the stent body; the support rod is used to abut against the target pipeline and form an anchor point after the stent body is expanded.

15. The anchoring device according to claim 14, characterized in that The stent body includes one or more annular stent segments; the support rod is connected to the distal end of the annular stent segment; the proximal end of the stent body is formed by a plurality of tail end rods circumferentially surrounded, and the tail end rods are connected to the proximal end of the annular stent segment to form one or more connection points.

16. The anchoring device according to claim 15, characterized in that There are multiple annular bracket segments, which are connected in sequence in the axial direction of the outer bracket; the support rod is connected to the farthest annular bracket segment, and the tail end rod is connected to the nearest annular bracket segment.

17. A blood pump system, characterized in that: It comprises a blood pump, a conveying device and an anchoring device as described in any one of claims 1 to 16, wherein the conveying device is used for conveying the anchoring device and the blood pump, and is also used for controlling the connection or separation of the blood pump with the inner layer support of the anchoring device.

18. The blood pump system according to claim 17, wherein: The delivery device comprises an inner sheath tube and an outer sheath tube which are slidably connected, wherein the outer sheath tube is used to be sleeved outside the inner sheath tube; and the inner sheath tube is used to be connected to the blood pump; The inner sheath is used to drive the blood pump to move along its own axial direction so as to connect or separate the blood pump from the inner stent; the outer sheath is used to move relative to the inner sheath so as to compress or release the anchoring device.

19. The blood pump system according to claim 18, wherein: The blood pump forms point contact with the inner layer support when being fixed.

20. The blood pump system of claim 18, wherein: The outer layer stent comprises a cylindrical stent body, a fixing portion is provided at the proximal end of the stent body, and the inner layer sheath is used to movably pass through the fixing portion from the proximal end of the anchoring device and is used to connect with the blood pump after passing through the fixing portion; After the blood pump is located at the distal end of the anchoring device, the outer sheath can move distally relative to the inner sheath so that the anchoring device is compressed in the cavity formed by the outer sheath and the inner sheath; the outer sheath can also move proximally relative to the inner sheath to release the compression of the anchoring device, thereby changing the anchoring device from a compressed state to an expanded state.

21. The blood pump system of claim 20, wherein: After the blood pump is located at the distal end of the anchoring device and the anchoring device is compressed in the cavity, the outer diameter of the outer sheath is not greater than the outer diameter of the blood pump.

22. The blood pump system of claim 20, wherein: The delivery device further comprises a pull wire, the inner sheath tube is circumferentially provided with insertion holes, one end of the pull wire is connected to the fixing portion, and the other end passes through the insertion hole and extends to the proximal ends of the inner sheath tube and the outer sheath tube.

23. The blood pump system of claim 20, wherein: The delivery device also includes an intermediate sheath tube, one end of which is connected to the fixing portion, and the other end of which passes through the outer sheath tube and extends outside the body. The intermediate sheath tube is located between the inner sheath tube and the outer sheath tube.

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