Anchoring device and blood pump system

Abstract

The application provides an anchoring device and a blood pump system, the blood pump system comprising a blood pump, a conveying device and the anchoring device, wherein 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; 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 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 as to limit the swing range of the blood pump during operation, and ensure the stability and reliability of the blood pump.

Description

TECHNICAL FIELD

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

[0002] An artificial heart, referred to as a blood pump, is used to do work on blood to enhance the flow capacity of blood. Blood pumps are divided into implantable blood pumps and extracorporeal blood pumps, wherein the implantable blood pump can be implanted into the patient's body. When actually implanted, the blood pump is usually suspended in the aorta by a fixing device to do work on the blood flowing in the aorta, thereby assisting the human body in blood circulation in the short or long term.

[0003] REFERENCE Figure 1 In the prior art, the fixing device generally comprises a mesh stent 100 and a pump body 200. The mesh stent 100 is connected to the head end of the pump body 200 along the radial direction of the mesh stent 100. The tail end of the pump body 200 is in a free state. In this way, the pump body 200 is always in the center position of the blood vessel wall after being connected to the mesh stent 100. However, the tail end 300 of the pump body 200 is not fixed, and the tail end 300 is more prone to deflection and oscillation when the pump body 200 is working.

[0004] The oscillation of the tail end 300 in the pump body 200 reduces 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 prone to friction and collision with the blood vessel wall during deflection and oscillation, thereby having the risk of damaging the blood vessel wall. SUMMARY

[0005] To solve the technical problems existing in the prior art, the purpose of the present application is to provide an anchoring device and a blood pump system. The anchoring device can fix the blood pump after implantation to limit the oscillation 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 application provides an anchoring device for anchoring a blood pump in a target pipeline, which comprises an inner layer stent and an outer layer stent. Both the inner layer stent and the outer layer stent have an expanded state and a compressed state. In the expanded state, the outer layer stent is anchored in the target pipeline by the radial expansion force of the outer layer stent, 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 containing space for placing the blood pump.

[0008] Optionally, the inner layer stent comprises a plurality of limiting rods, each of which is connected to the outer layer stent, and all the limiting rods are arranged at intervals in the circumferential direction of the outer layer stent. All the limiting rods are used to enclose the containing space and clamp and fix the blood pump.

[0009] Optionally, the outer layer stent comprises a stent body, and a fixing portion is arranged at a proximal end of the stent body and configured to allow the inner layer sheath to pass through.

[0010] Optionally, at least part of the inner layer stent is arranged inside the outer layer stent, 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 rods comprise arc-shaped segments and extension segments, one end of each of the arc-shaped segments is connected to the fixing portion, and the other end of each of the arc-shaped segments is connected to the extension segment; all of the extension segments form a trumpet-shaped opening pointing to a distal end, and all of the arc-shaped segments and all of the extension segments jointly enclose the accommodation space.

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

[0013] Optionally, the inner layer stent is arranged outside the stent body of the outer layer stent, a proximal end of the stent body is circumferentially surrounded by a plurality of tail end rods, a proximal end of each of the tail end rods is connected to the fixing portion, each of the limiting rods is connected to the fixing portion, and all of the tail end rods and all of the limiting rods are used to jointly enclose the accommodation space.

[0014] Optionally, the fixing portion comprises a plurality of positioning pieces, all of the positioning pieces are spaced apart along a circumferential direction of the outer layer stent, and one end of each of the limiting rods is connected to a corresponding one of the positioning pieces.

[0015] Optionally, the anchoring device further comprises a plurality of connecting rods, all of the connecting rods are spaced apart along a circumferential direction of the outer layer stent, one end of each of the connecting rods is connected to the outer layer stent, and the other end of each of the connecting rods is connected to a corresponding one of the limiting rods.

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

[0017] The one end of each of the limiting rods, which is away from the connecting rod, is capable of moving towards a distal end direction of the outer layer stent to allow the second annular structure to be located at the distal end of the limiting rod, and the one end of each of the limiting rods, which is away from the connecting rod, is also capable of moving towards a proximal end direction of the outer layer stent to allow the blood pump to be fixed in the accommodation space jointly enclosed by all of the limiting rods, and the outer layer stent is configured to be anchored in the target pipeline after the blood pump is fixed in the accommodation space.

[0018] Optionally, the fixed part 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.

[0019] Optionally, in the expanded state, the outer diameters of the plurality of segments of the stent body along the self-axis are different.

[0020] Optionally, the outer layer stent further comprises a support rod, one end of the support rod is connected with 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 anchoring point after the stent body is expanded.

[0021] Optionally, the stent body comprises one or more annular stent segments; the support rod is connected with the distal end of the annular stent segment; the proximal end of the stent body is formed by a plurality of tail end rods in the circumferential direction, the tail end rods are connected with the proximal end of the annular stent segment, and one or more connection points are formed.

[0022] Optionally, the number of the annular stent segments is a plurality, and the plurality of annular stent segments are connected in sequence in the axial direction of the outer layer stent; the support rod is connected with the distal-most annular stent segment, and the tail end rod is connected with the proximal-most annular stent segment.

[0023] To achieve the above-mentioned purpose, the application further provides a blood pump system, comprising a blood pump, a delivery device and any one of the anchoring devices, the delivery device is used to deliver 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 stent of the anchoring device.

[0024] Optionally, the delivery device comprises a slidingly connected inner sheath and an outer sheath, the outer sheath is used to be sleeved outside the inner sheath; the inner sheath is used to be connected with the blood pump;

[0025] The inner sheath is used to drive the blood pump to move along the self-axis to connect or separate the blood pump and the inner layer stent; the outer sheath is used to move relative to the inner sheath to compress or release the anchoring device.

[0026] Optionally, when the blood pump is fixed with the inner layer stent, point contact is formed.

[0027] Optionally, the outer layer stent comprises a cylindrical stent body, the proximal end of the stent body is provided with a fixed part, the inner sheath is used to movably pass through the fixed part from the proximal end of the anchoring device, and is used to be connected with the blood pump after passing through the fixed part;

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

[0029] Optionally, 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 tube 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 is provided with an insertion hole arranged in the circumferential direction, one end of the pull wire is connected with the fixed part, and the other end of the pull wire passes through the insertion hole and extends to the proximal end of the inner sheath tube and the outer sheath tube.

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

[0032] As described above, the present application provides an anchoring device and a blood pump system, the anchoring device is used for anchoring a blood pump in a target pipeline, and the anchoring device 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 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.

[0033] The anchoring device provided by the present application adopts a double-layer structure design, wherein after the outer layer support in the expanded state is fixed in the target pipeline, the inner layer support can fix the blood pump, so as to limit the swing range of the blood pump during operation, so that the blood pump is not easy to be deflected and moved relative to the outer layer support during operation, so as to 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, the blood pump can also avoid interfering with the blood in the target pipeline to cause instability of the blood flow, thereby ensuring the stability and reliability of the blood pump. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0036] Figure 3Fig. 1 is a schematic view of a structure of an anchoring device in an expanded state according to a preferred embodiment of the present application;

[0037] Figure 4 Fig. 2 is a schematic view of a structure of the anchoring device in Fig. 1 in an expanded state according to a preferred embodiment of the present application;

[0038] Figure 5 Fig. 3 is a schematic view of a structure of the anchoring device, a blood pump and a delivery device according to a preferred embodiment of the present application, wherein the blood pump is fixed in the anchoring device;

[0039] Figure 6 Fig. 4 is a schematic view of a structure of an anchoring device in an expanded state according to another preferred embodiment of the present application;

[0040] Figure 7 Fig. 5 is a schematic view of a structure of the anchoring device, a blood pump and a delivery device according to another preferred embodiment of the present application, wherein the blood pump is fixed in the anchoring device;

[0041] Figure 8 Fig. 6 is a schematic view of a structure of the anchoring device and a delivery device according to another preferred embodiment of the present application;

[0042] Figure 9 Fig. 7 is a schematic view of a structure of a delivery device according to a preferred embodiment of the present application;

[0043] Figure 10 Fig. 8 is a schematic view of a use scenario of a blood pump system according to a preferred embodiment of the present application in a target vessel, wherein the anchoring device is in a compressed state and the blood pump is located at a distal end of the anchoring device;

[0044] Figure 11 Fig. 9 is a schematic view of a use scenario of a blood pump system according to a preferred embodiment of the present application in a target vessel, wherein the anchoring device is in an expanded state and the blood pump is located at a distal end of the anchoring device;

[0045] Figure 12 Fig. 10 is a schematic view of a use scenario of a blood pump system according to a preferred embodiment of the present application in a target vessel, wherein the anchoring device is in an expanded state and the blood pump is fixed in the anchoring device;

[0046] Figure 13 Fig. 11 is a schematic view of a structure of an anchoring device in an expanded state according to a preferred embodiment of the present application;

[0047] Figure 14 Fig. 12 is a schematic view of a structure of the anchoring device in Fig. 11 in an expanded state according to a preferred embodiment of the present application;

[0048] Figure 15 Fig. 13 is a schematic view of a structure of an anchoring device in an expanded state according to another preferred embodiment of the present application;

[0049] Figure 16Figure 2 is a schematic diagram of the structure of the anchoring device, blood pump and delivery device in the second preferred embodiment of the present application, wherein the blood pump is fixed in the anchoring device;

[0050] Figure 17 Figure 3 is a schematic diagram of the structure of the blood pump system in the second preferred embodiment of the present application, wherein the blood pump is fixed in the anchoring device;

[0051] Figure 18 Figure 4 is a schematic diagram of the structure of the delivery device in the second preferred embodiment of the present application;

[0052] Figure 19 Figure 5 is a schematic diagram of the use scenario of the blood pump system in the target pipeline in the second preferred embodiment of the present application, wherein the anchoring device is in the compressed state and the blood pump is located at the distal end of the anchoring device;

[0053] Figure 20 Figure 6 is a schematic diagram of the use scenario of the blood pump system in the target pipeline in the second preferred embodiment of the present application, wherein the anchoring device is in the expanded state and the blood pump is located at the distal end of the anchoring device;

[0054] Figure 21 Figure 7 is a schematic diagram of the use scenario of the blood pump system in the target pipeline in the second preferred embodiment of the present application, wherein the anchoring device is in the expanded state and the blood pump is fixed in the anchoring device.

[0055] Figure: mesh stent 100; pump body 200; tail end 300;

[0056] anchoring device 1; inner layer stent 11; accommodation space 111; limiting rod 112; arc segment 1121; extension segment 1122; second ring structure 113; outer layer stent 12; stent main body 121; ring stent segment 1211; tail end rod 122; fixed part 123, 126; ear 1231, 1261; positioning sheet 124; support rod 125; connecting rod 13; blood pump 2; target pipeline 3; delivery device 4; inner layer sheath 41; loading segment 411; main body segment 412; insertion hole 413; outer layer sheath 42; pull wire 43. DETAILED DESCRIPTION

[0057] The present application will be further described below in conjunction with the drawings and specific embodiments. According to the following description, the advantages and features of the present application will be more apparent. It should be noted that the drawings are very simplified and use non-precise proportions, only for the purpose of facilitating and clearly assisting the description of the embodiments of the present application.

[0058] The terms "central", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate relative positions or orientations based on the orientations or positions shown in the drawings, are used only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. The term "proximal" generally refers to the end closer to the operator; "distal" refers to the end opposite to the "proximal" end, generally referring to the end away from the operator.

[0059] <Embodiment One>

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

[0061] It should be understood that the target conduit 3 refers to the blood vessel in which the blood pump 2 needs to be implanted, and the target conduit 3 can also refer to a blood vessel model used for preoperative simulation. In this embodiment, the target conduit 3 is the abdominal aorta, but 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 by the anchoring device 1, and then work on the blood flowing through the abdominal aorta by the blood pump 2.

[0062] Referring to Figure 3 The anchoring device 1 includes an inner layer stent 11 and an outer layer stent 12. The anchoring device 1 has an expanded state and a compressed state, and can be converted between the expanded state and the compressed state. Specifically, the anchoring device 1 can be compressed and implanted in the human body and delivered to a predetermined position of the target conduit 3, at which time the inner layer stent 11 and the outer layer stent 12 are both in the 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 stent 11 and the outer layer stent 12 are both in the expanded state.

[0063] It should be understood that the expansion of the inner layer stent 11 and the outer layer stent 12 both refer to expanding outward along the radial direction of itself, at which time the radial dimension of the inner layer stent 11 and the outer layer stent 12 increases; similarly, the compression of the inner layer stent 11 and the outer layer stent 12 both refer to contracting inward along the radial direction of itself, at which time the radial dimension of the inner layer stent 11 and the outer layer stent 12 decreases.

[0064] In the expanded state, the outer stent 12 is used to anchor in the target pipeline 3 by its own radial expansion force, so as to fix the inner stent 11 and the outer stent 12 at a 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, so as to prevent the blood pump 2 from moving and / or deflecting relative to the outer stent 12. It should be further explained that the inner stent 11 and the outer stent 12 can be connected with each other, such as Figure 2 As shown in the figure, the inner stent 11 and the outer stent 12 are both fixed on the fixing part 123 to realize the connection of the inner stent 11 and the outer stent 12, the fixing part 123 is sleeved on the inner sheath 41, and the inner sheath 41 can move through the fixing part 123. The inner stent 11 and the outer stent 12 can be separated from each other, the proximal end of the inner stent 11 is provided with a fixing part, the proximal end of the outer stent 12 is provided with another fixing part, and the fixing part of the inner stent 11 and the fixing part of the outer stent 12 are separated from each other and are both sleeved on the inner sheath 41, and the inner sheath 41 can move through the fixing part of the inner stent 11 and the fixing part of the outer stent 12.

[0065] The anchoring device 1 of the present application adopts a double-layer structure design, wherein after the outer stent 12 in the expanded state is fixed in the target pipeline 3, the inner stent 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 stent 12 during operation. By such arrangement, on the one hand, it can 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 to cause instability of the blood flow, thereby ensuring the stability and reliability of the blood pump 2.

[0066] As shown in the figure, the inner stent 11 and the outer stent 12 are both fixed on the fixing part 123 to realize the connection of the inner stent 11 and the outer stent 12, the fixing part 123 is sleeved on the inner sheath 41, and the inner sheath 41 can move through the fixing part 123. The inner stent 11 and the outer stent 12 can be separated from each other, the proximal end of the inner stent 11 is provided with a fixing part, the proximal end of the outer stent 12 is provided with another fixing part, and the fixing part of the inner stent 11 and the fixing part of the outer stent 12 are separated from each other and are both sleeved on the inner sheath 41, and the inner sheath 41 can move through the fixing part of the inner stent 11 and the fixing part of the outer stent 12. Figure 2 As shown in the figure, the inner stent 11 and the outer stent 12 are both fixed on the fixing part 123 to realize the connection of the inner stent 11 and the outer stent 12, the fixing part 123 is sleeved on the inner sheath 41, and the inner sheath 41 can move through the fixing part 123. The inner stent 11 and the outer stent 12 can be separated from each other, the proximal end of the inner stent 11 is provided with a fixing part, the proximal end of the outer stent 12 is provided with another fixing part, and the fixing part of the inner stent 11 and the fixing part of the outer stent 12 are separated from each other and are both sleeved on the inner sheath 41, and the inner sheath 41 can move through the fixing part of the inner stent 11 and the fixing part of the outer stent 12.

[0067] The implanting and fixing process of the blood pump 2 is as follows: after the blood pump 2 is moved distally and located at the distal end of the outer stent 11 and the inner stent 11, i.e. the blood pump 2 is located 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 being compressed. 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 decompressed and expanded, and 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: firstly, the anchoring device 1 and the blood pump 2 are loaded and the anchoring device 1 is compressed outside the body by the delivery device 4, then the delivery device 3 is sent into the body, and then the anchoring device 1 and the blood pump 2 are delivered into 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 stent 11 and the outer stent 12. Then the blood pump 2 is driven by the delivery device 4 to move proximally and be fixed with the inner stent 11, at this time the outer stent 12 abuts against and is anchored with the inner wall of the target pipeline 3. When it is necessary to withdraw the blood pump 2, the blood pump 2 is driven by the delivery device 4 to move distally, so that the blood pump 2 is separated from the inner stent 11. After the blood pump 2 is separated from the inner stent 11, the blood pump 2 enters the delivery device 4 again, and then 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 by the delivery device 4.

[0069] In an example, the inner stent 11 and the outer stent 12 can be compressed under external force and can automatically expand after being decompressed. The inner stent 11 and the outer stent 12 are preferably made of super-elastic material, and the material for preparing the inner stent 11 and the outer stent 12 includes but is not limited to metal material (such as nickel-titanium alloy) or polymer material, etc., so as to realize the anchoring of the outer stent 12 in the target pipeline 3 and the separation from the target pipeline 3.

[0070] Referring to FIGS. 1 to 3, Figure 3 and Figure 4 As shown, in the expanded state, the inner stent 11 has a containing space 111 for placing the blood pump 2, and the minimum inner diameter of the containing space 111 matches the outer diameter of the blood pump 2.

[0071] In an example, the blood pump 2 can be moved into and clamped and fixed in the containing space 111. Specifically, the blood pump 2 is used to move into and be fixed in the containing space 111 formed by the inner stent 11 in the expanded state under the driving of the delivery device 4, and the blood pump 2 is also used to move out of the containing space 111 under the driving of the delivery device 4 to be separated from the inner stent 11.

[0072] Referring to FIGS. 1 to 3, Figure 4As shown, in a preferred embodiment, the inner layer support 11 comprises a plurality of limiting rods 112, which are preferably elastic, and each of which is connected to the outer layer support 12. All the limiting rods 112 are arranged at intervals in the circumferential direction of the outer layer support 12 and are used to enclose the accommodating space 111; all the limiting rods 112 are also used to clampingly fix the blood pump 2.

[0073] Since the limiting rods 112 are elastic and can easily deform, all the limiting rods 112 can move radially along themselves when the blood pump 2 enters the accommodating space 111, to allow the blood pump 2 to enter, at which 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 arrangement of the limiting rods 112 can make the blood pump 2 more easily move into or out of the accommodating space 111, thereby facilitating the fixing 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 layer support 12, and the other end of each limiting rod 112 is a free end.

[0075] The number of limiting rods 112 is not limited in the present application, and in the present embodiment, the limiting rods 112 are 6; in other embodiments, the limiting rods 112 can also be 2, 3 or more.

[0076] In other embodiments, the inner layer support 11 can also be a mesh structure or a thin-walled structure, at which time the mesh structure or the thin-walled structure can enclose the accommodating space 111 and can deform to allow the blood pump 2 to move in or out.

[0077] More preferably, the blood pump 2 forms a point contact with the inner layer support 11 when fixed, which can reduce the contact area of the inner layer support 11 and the blood pump 2, reduce the risk of thrombosis 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 comprises an arc-shaped section 1121, which protrudes towards the outer layer support 12 or away from the outer layer support 12. After the blood pump 2 enters the accommodating space 111 enclosed by the plurality of limiting rods 112, the blood pump 2 only contacts one or several fixed points on the arc-shaped section 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 comprises an extension segment 1122, one end of the extension segment 1122 is connected with the arc segment 1121, and the other end is a free end. All the extension segments 1122 form a trumpet shape opening towards the distal end of the outer layer stent 12, and all the arc segments 1121 and all the extension segments 1122 jointly enclose the accommodation space 111. In this way, the inclined extension segment 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 with the arc segment 1121, and the other end of the extension segment 1122 can also be connected with the outer layer stent 12, thereby increasing the resistance of the inner layer stent 11 to the swing of the blood pump 2.

[0081] Continuing to refer to Figure 4 , the outer layer stent 12 comprises a stent body 121 in a cylindrical shape. The stent body 121 comprises a mesh structure, which can be a mesh structure formed by weaving a plurality of wires or a mesh structure formed by laser cutting and then fixed.

[0082] In a preferred example, the proximal end of the stent body 121 is circumferentially surrounded by a plurality of tail end rods 122, and the proximal end of the stent body 121 is provided with a fixed portion 123 through which the inner layer sheath can pass. The proximal end of each tail end rod 122 is connected with the fixed portion 123, so that the outer layer stent 12 forms an open-ended structure.

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

[0084] In this embodiment, the inner layer stent 11 is located inside the outer layer stent 12, and in the axial direction of the stent body 121, the length of the limiting rod 112 in the extension direction thereof does not exceed the blood inlet of the blood pump 2. In this way, the inner layer stent 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] Referring to Figure 4 , in this embodiment, the fixed 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. In this way, when the blood pump 2 is fixed in the accommodation space 111 of the inner layer stent 11, the blood pump 2 can be located on the axis of the outer layer stent 12, i.e. the blood pump 2 can be located at the center position of the outer layer stent 12, so as to maximize the prevention of the blood pump 2 from being deflected to rub against the blood vessel wall, thereby ensuring the safety of the blood pump 2 in operation.

[0086] Referring to Figure 5 In a preferred embodiment, the tail end rods 122 are straight rods, and the tail end rods 122 are arranged outside the limiting rods 112, and the blood pump 2 can be moved into and fixed in the accommodating space 111 formed by the limiting rods 112.

[0087] Referring to Figure 6 In an exemplary embodiment, the tail end rods 122 can be in the shape of “Y”, that is, the tail end rods 122 are composed of three rod members, and the three rod members intersect at one end. Among them, two rod members are used to connect with the mesh structure of the stent body 121, and the remaining one rod member is used to connect with the fixed part 123, that is, the distal end of each tail end rod 122 has two connection points with the mesh structure of the stent body 121, and the proximal end of each tail end rod 122 has only one connection point with the fixed part 123. In this way, the number of tail end rods 122 can be reduced, so as to reduce the difficulty of compression and expansion of the outer stent 12.

[0088] Referring to Figure 7 In another preferred embodiment, the proximal end of each tail end rod 122 is connected with the fixed part 123, and each limiting rod 112 is connected with the fixed part 123, and the shape of the tail end rod 122 is preferably curved, and all the tail end rods 122 and all the limiting rods 112 are used to jointly enclose the accommodating space 111, that is, the tail end rods 122 and the limiting rods 112 can be used to fix and limit the blood pump 2.

[0089] Continuing to refer to Figure 7 In an example, the tail end rods 122 and the limiting rods 112 have the same or similar shape, and the tail end rods 122 and the limiting rods 112 are sequentially and spaced arranged in the circumferential direction of the outer stent 12, and the fixed part 123 is used to fix the proximal end of the tail end rods 122 and the limiting rods 112, and the blood pump 2 can be moved into or out of the accommodating space 111 enclosed by the tail end rods 122 and the limiting rods 112, so that the blood pump 2 can be fixed firmly, and further prevent the blood pump 2 from deflecting when working.

[0090] Referring to Figure 8 In yet another preferred embodiment, the fixed part 123 is a plurality of positioning pieces 124, and all the positioning pieces 124 are spaced distributed along the circumferential direction of the outer stent 12, and one end of each limiting rod 112 is connected with a corresponding one of the positioning pieces 124. The distal end of each positioning piece 124 is preferably connected with the proximal end of one or more tail end rods 122. At least part of the positioning pieces 124 can be connected with the delivery device 4, so that when the anchoring device 1 is seriously endothelialized and is not easy to be taken out, the connection between the positioning pieces 124 and the delivery device 4 can be cut off to leave the anchoring device 1 in the patient's body.

[0091] In one embodiment, the stent body 121 has different outer diameters along the segments in the axial direction of the stent body 121 in the expanded state, i.e., the stent body 121 is configured as a variable diameter structure along the axial direction of the stent body 121. In this way, when the stent body 121 is expanded and fixed in the target pipeline 3, only part of the stent body 121 is in contact with the inner wall of the target pipeline 3, so that the contact area between the stent body 121 and the target pipeline 3 can be reduced, the endothelialization of the outer stent 12 in a large area can be avoided when the outer stent 12 is implanted for a long time, the recovery force of the outer stent 12 can be reduced when the outer stent 12 is recovered, damage to the target pipeline 3 can be avoided as much as possible when the outer stent 12 is recovered, and the risk that the outer stent 12 cannot be removed can be reduced.

[0092] In another embodiment, the stent body 121 can also be configured as a cylindrical structure along the axial direction of the stent body 121 to improve the radial support force of the stent body 121 and avoid deformation or damage of the stent body 121 after implantation.

[0093] Preferably, the outer stent 12 forms a point contact with the target pipeline 3 when anchored, so that the contact area between the outer stent 12 and the target pipeline 3 can be reduced, the area of endothelialization of the outer stent 12 and the target pipeline 3 after anchoring can be reduced, the separation of the outer stent 12 and the target pipeline 3 can be facilitated, and the risk of tearing the inner wall of the target pipeline 3 to cause vascular stenosis when the outer stent 12 is recovered can be reduced.

[0094] Referring to Figure 4 , as a preferred example, the outer stent 12 further 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 and form an anchoring point (not shown) after the stent body 121 is expanded, and the stent body 121 does not abut against the inner wall of the target pipeline 3. At this time, the expanded outer stent 12 forms a point contact with the target pipeline 3, and then the anchoring and evacuation of the outer stent 12 are facilitated.

[0095] Continuing to refer to Figure 4 , the stent body 121 includes one or more annular stent segments 1211 extending in the circumferential direction of the outer stent 12, and the axis of the annular stent segment 1211 is preferably coincident 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] Referring to Figure 4 and Figure 5As shown, the number of annular stent segments 1211 is multiple, and the multiple annular stent segments 1211 are connected in sequence in the axial direction of the outer stent 12. In the present embodiment, the annular stent segments 1211 are sawtooth structures extending in the circumferential direction of the outer stent 12. In other embodiments, the annular stent segments 1211 can also be arc structures, wave structures or other types of structures extending in the circumferential direction 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 distal-most annular stent segment 1211. For example, the support rod 125 can be connected to the distal end of the distal-most annular stent segment 1211 (see Figure 4 ), or the support rod 125 can be connected to the proximal end of the distal-most annular stent segment 1211 (see Figure 6 ).

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

[0099] As shown in Figure 9 and Figure 10 , the delivery device 4 includes a slidingly connected inner sheath 41 and an outer sheath 42, and the outer sheath 42 is used to be sleeved outside the inner sheath 41. The inner sheath 41 is used to be connected with the blood pump 2. The inner sheath 41 is used to drive the blood pump 2 to move in the axial direction of the inner sheath 41, so as to connect or separate the blood pump 2 from the inner stent 11, i.e. to move the blood pump 2 into or out of the containing space 111. The outer sheath 42 is used to move relative to the inner sheath 41, so as to compress or release the anchoring device 1.

[0100] As shown in Figure 11 , and in combination with Figure 4 , the inner sheath 41 is used to movably pass through the fixed part 123 from the proximal end of the anchoring device 1, and is used to be connected with the blood pump 2 after passing through the fixed part 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 on the anchoring device 1, thereby changing the anchoring device 1 from a compressed state to an expanded state.

[0102] Continue to refer to Figure 9 The inner sheath 41 includes a loading section 411 and a main body section 412 connected axially from distal to proximal. The axes of the loading section 411 and the main body section 412 coincide, and the outer diameter of the loading section 411 is smaller than the radial dimension of the main body section 412. The distal end of the loading section 411 passes through the fixing part 123 from the proximal end and connects to the blood pump 2. (Refer to...) Figure 10 and Figure 11 As shown, the inner sheath 41 can drive the blood pump 2 to move distally, so that the anchoring device 1 is fitted onto the outside of the loading section 411, at which point the blood pump 2 is located distal to the anchoring device 1. (Refer to...) Figure 12 The inner sheath 41 can also drive the blood pump 2 to move proximally so that the anchoring device 1 is located outside the blood pump 2 and fixes the blood pump 2, at which time the anchoring device 1 is located at the distal end of the loading section 411.

[0103] Preferably, with the blood pump 2 located at the distal end of the anchoring device 1 and the anchoring device 1 compressed within the cavity, the outer diameter of the outer sheath 42 is no greater than the outer diameter of the blood pump 2. With this configuration, 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 tubing 3. The anchoring device 1 is then secured within the outer sheath 42. At this point, the maximum size of the entire blood pump system is the outer diameter of the blood pump 2. This reduces the cross-sectional area of ​​the entire blood pump system, preventing damage to the target tubing 3 during delivery and mitigating the occurrence of vascular complications.

[0104] Reference Figures 9-12 As shown, the conveying device 4 also includes a pull wire 43, and an insertion hole 413 is arranged circumferentially on the inner sheath tube 41. One end of the pull wire 43 is connected to the fixing part 123 of the anchoring device 1, and the other end passes through the insertion hole 413 and extends to the proximal end of the inner sheath tube 41 and the outer sheath tube 42.

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

[0106] In one example, one end of the pull wire 43 is connected with 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 with an external device (such as an operating handle), so that the operator can drive the anchor 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 42 to be connected with an external device, so that the operator can drive the anchor device 1 to move by pulling the pull wire 43. When it is required to leave the anchor device 1 in the implanted position, one end of the pull wire 43 can be pulled to pull the pull wire 43 out of the body.

[0108] The material of the pull wire 43 is not limited in the present application, and the pull wire 43 can be made of metal materials such as stainless steel or nickel-titanium wire, or high polymer materials such as nylon, polyester or polypropylene. Meanwhile, the pull wire 43 can be connected with the anchor device 1 by welding, bonding or binding, etc.

[0109] In another preferred embodiment, the delivery device 4 further comprises an intermediate sheath (not numbered), one end of which is connected with the fixing part 123, and the other end passes through the outer sheath 42 and extends to the outside of the body, and the intermediate sheath is located between the inner sheath 41 and the outer sheath 42.

[0110] Further, a plurality of developing structures (not shown) can be distributed on the inner sheath 41 and the outer sheath 42, which are used to show the moving position when the inner sheath 41 and the outer sheath 42 move, and the operator can determine the stopping position when the inner sheath 41 and the outer sheath 42 move, so as to ensure that the operation can be smoothly carried out.

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

[0112] Referring to Figure 10 , before the blood pump 2 is implanted, the inner sheath 41 is pushed to the distal end, so that the blood pump 2 is located at the distal end of the anchor device 1. The anchor 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 abuts against the proximal end of the blood pump 2.

[0113] Referring to Figure 11 , after the anchor device 1 is implanted to the target pipeline 3, the outer sheath 42 is pulled to the proximal end of the anchor device 1, and the anchor device 1 can be decompressed and expanded to the size before compression, so that the outer stent 12 is anchored on the target pipeline 3.

[0114] Referring to Figure 12, the inner sheath tube 41 is pulled proximally until the blood pump 2 is fixed in the accommodating space 111 of the inner stent 11 and abuts against the first annular structure. The relative positions of the inner sheath tube 41 and the outer sheath tube 42 are fixed to complete the delivery and release process of the whole blood pump 2.

[0115] After the blood pump 2 works in the target pipeline 3 for a period of time, the blood pump 2 needs to be retrieved from the body. Continuing to refer to Figure 10 , when the blood pump 2 is withdrawn, the fixation of the inner sheath tube 41 and the outer sheath tube 42 is released, and the inner sheath tube 41 is pushed distally, and the inner sheath tube 41 drives the blood pump 2 to move out of the inner stent 11 until the proximal end of the anchoring device 1 is located at the connection between the loading section 411 and the main body section 412 of the inner sheath tube 41, at which time the blood pump 2 is located at the distal end of the anchoring device 1. The position of the inner sheath tube 41 is fixed, and then the outer sheath tube 42 is pushed distally to compress the anchoring device 1 into the outer sheath tube 42 until the anchoring device 1 is completely compressed into the cavity formed by the outer sheath tube 42 and the loading section 411, and finally the anchoring device 1, the blood pump 2 and the delivery device 4 are withdrawn from the target pipeline 3 to complete the whole retrieval process of the blood pump 2.

[0116] <Embodiment Two>

[0117] For the sake of clarity, the fixing portion 126 of Embodiment Two adopts a different reference numeral from the fixing portion 123 in Embodiment One, but even if the reference numerals are different, the embodiments of the fixing portion 123 in Embodiment One are also applicable to the fixing portion 126 in Embodiment Two for the same parts. The following mainly describes the differences between Embodiment One and Embodiment Two, and for the same parts, please refer to Embodiment One.

[0118] Referring to Figure 13 and Figure 14 , in a preferred embodiment, the inner stent 11 comprises a plurality of limiting rods 112 and a second annular structure 113, the limiting rods 112 are deformable bodies, and all the limiting rods 112 are arranged at intervals in the circumferential direction of the outer stent 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] Continuing to refer to Figure 13 and Figure 14 , the anchoring device 1 further comprises a plurality of connecting rods 13, all the connecting rods 13 are arranged at intervals in the circumferential direction of the outer stent 12, one end of each connecting rod 13 is connected with the outer stent 12, and the other end is connected with a corresponding one of the limiting rods 112. The end of each limiting rod 112 away from the connecting rod 13 is connected with the second annular structure 113.

[0120] The distal end of each of the limiting rods 112 is movable towards the distal end of the outer layer holder 12, so that the second ring structure 113 is located at the distal end of the limiting rods 112; the distal end of each of the limiting rods 112 is also movable towards the proximal end of the outer layer holder 12, until the limiting rods 112 are S-shaped, and can provide an anchoring force to the blood pump 2, so that the blood pump 2 is fixed in the accommodating space 111 formed by the limiting rods 112 (see Figure 17 ). The outer layer holder 12 is used to anchor in the target pipeline 3 after the blood pump 2 is fixed in the accommodating space 111.

[0121] As shown in Figure 15 , in an embodiment, the number of the ring holder segments 1211 is one, the connecting rod 13 is connected to the distal end of the ring holder segment 1211, and the tail end rod 122 is connected to the proximal end of the ring holder segment 1211. As shown in Figure 13 , in another embodiment, the number of the ring holder segments 1211 can also be two or more.

[0122] As shown in Figures 13-16 , the fixing part 126 is a third ring structure, the second ring structure 113 is located at the distal end of the third ring structure, and the axis of the second ring structure 113 coincides with the axis of the third ring structure. In this way, the inner layer sheath 41 can pass through the third ring structure and the second ring structure 113 in sequence from the proximal end and be connected to the blood pump 2.

[0123] In the present embodiment, the fixing part 126 is provided with an ear 1261 for passing through the pull wire 43 (see Figure 14 ), and the main body segment 412 is circumferentially provided with an insertion hole 413 (see Figure 18 ). One end of the pull wire 43 is connected to the ear 1261, and the other end of the pull wire 43 passes through the insertion hole 413 and extends to the proximal end of the inner layer sheath 41 and the outer layer sheath 42.

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

[0125] As shown in Figure 19 , before the blood pump 2 is implanted, the inner layer sheath 41 is first pushed towards the distal end, so that the inner layer sheath 41 drives the blood pump 2 to move the second ring structure 113 towards the distal end, so that the limiting rods 112 extend away from the outer layer holder 12, until the second ring structure 113 is located at the distal end of the limiting rods 112. At this time, at least part of the inner layer holder 11 is located outside the holder main body 121 of the outer layer holder 12, and the blood pump 2 is located outside the inner layer holder 11. Then, the anchoring device 1 is compressed in the cavity (not shown) formed by the outer layer sheath 42 and the loading segment 411, the distal end of the outer layer sheath 42 abuts against the proximal end of the blood pump 2, and then implanted in the body.

[0126] Referring to Figure 20 As shown in the drawings, after the inner layer stent 11 and the outer layer stent 12 reach the predetermined position of the target pipeline 3, the outer layer sheath 42 is pulled to the proximal end of the anchoring device 1, and the anchoring device 1 can be released to expand.

[0127] Referring to Figure 21 As shown in the drawings, the inner layer sheath 41 is pulled to the proximal end, the inner layer sheath 41 drives the blood pump 2 to move the second ring structure 113 to the proximal end, so that the limiting rod 112 is bent and folded, until the developing structure on the inner layer sheath 41 coincides with the second ring structure 113, at this time, the inner layer stent 11 is accommodated in the outer layer stent 12, and the blood pump 2 is moved into and fixed in the accommodation space 111. The process of moving the blood pump 2 into the accommodation space 111 can promote the outer layer stent 12 to continue to expand until the outer layer stent 12 is anchored on the target pipeline 3. The relative position of the inner layer sheath 41 and the outer layer sheath 42 is fixed to complete the delivery and release process of the whole blood pump 2.

[0128] Continuing to refer to Figure 19 When the blood pump 2 is withdrawn, the fixing of the inner layer sheath 41 and the outer layer sheath 42 is released first, the inner layer sheath 41 is pushed to the distal end, the inner layer sheath 41 drives the blood pump 2 to move the second ring structure 113 to the distal end again, until the second ring structure 113 is placed at the farthest end of the limiting rod 112. The position of the inner layer sheath 41 is fixed, and then the outer layer sheath 42 is pushed to the distal end, the anchoring device 1 is compressed into the outer layer sheath 42, until the anchoring device 1 is completely compressed into the cavity formed by the outer layer sheath 42 and the loading section 411, and finally the anchoring device 1, the blood pump 2 and the delivery device 4 are withdrawn from the target pipeline 3 to complete the whole blood pump 2 recovery process.

[0129] In summary, the present application provides an anchoring device 1 and a blood pump system, the anchoring device 1 adopts a double-layer structure design, wherein after the outer layer stent 12 in the expanded state is fixed in the target pipeline 3, the inner layer stent 11 can fix the blood pump 2 to limit the swing range of the blood pump 2 when operating, so that the blood pump 2 is not easy to be deflected and moved relative to the outer layer stent 12 when operating. By such arrangement, on the one hand, it can prevent the blood pump 2 from rubbing and colliding with the blood vessel wall when operating, 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 to cause 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 application, and does not limit the scope of the present application in any way. Any modification or modification made by a person skilled in the art according to the above disclosure is within the protection scope of the present application.

Claims

1. An anchoring device for anchoring a blood pump within a target pipeline, characterized in that, It includes an inner stent and an outer stent; both the inner stent and the outer stent have an expanded state and a compressed state; in the expanded state, the outer stent is used to anchor itself in the target pipeline by its own radial expansion force, and the inner stent is used to clamp and fix the blood pump; the inner stent is fixed to the outside of the blood pump to limit the swing amplitude of the blood pump during operation, so that the blood pump is not easily deflected or moved relative to the outer stent during operation.

2. The anchoring device as described in claim 1, characterized in that, In the expanded state, the inner stent has a receiving space for accommodating the blood pump.

3. The anchoring device as described in claim 2, characterized in that, The inner stent includes multiple limiting rods, each of which is connected to the outer stent. All the limiting rods are spaced apart in the circumferential direction of the outer stent. All the limiting rods are used to enclose and form the receiving space, and also to clamp and fix the blood pump.

4. The anchoring device as described in claim 3, characterized in that, The outer support includes a support body, and the proximal end of the support body is provided with a fixing part through which the inner sheath can pass.

5. The anchoring device as described in claim 4, characterized in that, At least a portion of the inner support is disposed inside the outer support; one end of each limiting rod is connected to the fixing part, and the other end of each limiting rod is a free end.

6. The anchoring device as described in claim 5, characterized in that, The limiting rod includes an arc-shaped segment and an extension segment. One end of the arc-shaped segment is connected to the fixing part, and the other end is connected to the extension segment. All the extension segments form a flared shape that opens towards the far end of the outer support. All the arc-shaped segments and all the extension segments together enclose the receiving space.

7. The anchoring device as described in claim 4, characterized in that, The fixing part is a first ring structure, the axis of the first ring structure coincides with the axis of the outer support, and in the expanded state, the outer diameter of the first ring structure is smaller than the outer diameter of the support body.

8. The anchoring device as described in claim 4, characterized in that, The proximal end of the support body is formed by multiple tail rods circumferentially surrounding it. The proximal end of each tail rod is connected to the fixing part, and each limiting rod is connected to the fixing part. All the tail rods and all the limiting rods are used to jointly enclose and form the receiving space.

9. The anchoring device as described in claim 4, characterized in that, The fixing part consists of multiple positioning pieces, all of which are distributed at intervals along the circumference of the outer support, and one end of each limiting rod is connected to a corresponding positioning piece.

10. The anchoring device as described in claim 4, characterized in that, It also includes multiple connecting rods, all of which are distributed circumferentially along the outer support. One end of each connecting rod is connected to the outer support, and the other end is connected to a corresponding limiting rod.

11. The anchoring device as claimed in claim 10, characterized in that, The inner stent further includes a second annular structure, wherein one end of each limiting rod away from the connecting rod is connected to the second annular structure, and the distal end of the second annular structure is used to connect to the proximal end of the blood pump; The ends of all the limiting rods away from the connecting rod are movable toward the distal end of the outer support, so that the second annular structure is located at the distal end of the limiting rod; the ends of all the limiting rods away from the connecting rod are also movable toward the proximal end of the outer support, so that the blood pump is fixed in the receiving space formed by all the limiting rods; the outer support is used to anchor the blood pump in the target pipeline after it is fixed in the receiving space.

12. The anchoring device as claimed in claim 11, characterized in that, The fixing part is a third ring structure, and the second ring structure is located at the far end of the third ring structure. The axis of the second ring structure coincides with the axis of the third ring structure.

13. The anchoring device as described in claim 4, characterized in that, In the expanded state, the outer diameter of multiple sections of the support body along its own axial direction is different.

14. The anchoring device as claimed in claim 4, characterized in that, The outer support also includes a support rod, one end of which is connected to the support 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 support body; the support rod is used to abut against the target pipeline and form an anchor point after the support body expands.

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

16. The anchoring device as described in claim 15, characterized in that, The number of annular support segments is multiple, and the multiple annular support segments are connected sequentially in the axial direction of the outer support; the support rod is connected to the farthest annular support segment, and the tail rod is connected to the nearest annular support segment.

17. A blood pump system, characterized in that, It includes a blood pump, a delivery device, and an anchoring device as described in any one of claims 1-16, wherein the delivery device is used to deliver the anchoring device and the blood pump, and is also used to control the connection or separation of the blood pump from the inner support of the anchoring device.

18. The blood pump system as claimed in claim 17, characterized in that, The delivery device includes an inner sheath and an outer sheath that are slidably connected. The outer sheath is used to be sleeved over the outside of the inner sheath. The inner sheath is used to connect to the blood pump. The inner sheath is used to drive the blood pump to move along its own axis so that the blood pump can be connected to or disconnected from the inner support; the outer sheath is used to move relative to the inner sheath to compress or release the anchoring device.

19. The blood pump system as claimed in claim 18, characterized in that, The blood pump forms point contact with the inner stent when it is fixed.

20. The blood pump system as claimed in claim 18, characterized in that, The outer stent includes a cylindrical stent body, a fixing part is provided at the proximal end of the stent body, and the inner sheath is used to movably pass through the fixing part from the proximal end of the anchoring device and to connect to the blood pump after passing through the fixing part. 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 to compress the anchoring device in the cavity formed by the outer and inner sheaths; 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 as claimed in claim 20, characterized in that, When 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 as claimed in claim 20, characterized in that, The conveying device also includes a pull wire, with an insertion hole arranged circumferentially on the inner sheath. One end of the pull wire is connected to the fixing part, and the other end passes through the insertion hole and extends to the proximal ends of the inner sheath and the outer sheath.

23. The blood pump system as claimed in claim 20, characterized in that, The delivery device also includes an intermediate sheath, one end of which is connected to the fixing part, and the other end passes through the outer sheath and extends outside the body. The intermediate sheath is located between the inner sheath and the outer sheath.

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