Valve stent conveying device and valve conveying system

Abstract

The invention discloses a valve stent conveying device and a valve conveying system. The valve stent delivery device comprises an outer sheath tube; the inner sheathing canal is movably arranged in the outer sheathing canal in a penetrating manner, and a release wire is arranged in the inner sheathing canal in a penetrating manner; the core tube is movably arranged in the inner sheath tube in a penetrating manner, one end of the core tube is provided with a fixed end, the core tube is further connected with a fixed claw and a recovery guide part, and the recovery guide part is located between the fixed end and the fixed claw and is connected to the core tube in a sliding manner; the capsule assembly comprises a capsule cavity and a pull wire, the pull wire is movably arranged in the core tube in a penetrating mode, one end of the pull wire is connected with the capsule cavity, and the capsule cavity is used for loading the valve support connected through the fixing end and the fixing claw; wherein the recovery guide piece is used for guiding the capsule cavity to move into the outer sheath tube when the capsule cavity is recovered. By means of the mode, the valve support conveying device can avoid the situation that the valve support is carried when the capsule cavity is withdrawn.

Description

Technical Field

[0001] The present application relates to the technical field of interventional valve surgery-related instruments, and in particular to a valve stent delivery device and a valve delivery system. Background Art

[0002] Transcatheter Aortic Valve Replacement (TAVR) is a minimally invasive surgery that has been widely used internationally to treat aortic valve disease. Through interventional catheter technology, an artificial heart valve is delivered to the location of the aortic valve, thereby completing the implantation of the artificial valve and restoring valve function. TAVR has the advantages of less trauma, faster recovery, and higher quality of life for patients after surgery, and has become the current trend in the treatment of aortic valve disease.

[0003] For regurgitant aortic valve disease, current TAVR products mostly use a stent with a positioning piece. The positioning piece is inserted into the valve sinus to position the valve, so that the valve leaflets coincide with the body's native leaflets, ensuring better postoperative hemodynamics of the valve. At the same time, the clamping force of the positioning piece and the valve frame on the native leaflets ensures strong support for the valve after implantation, which is suitable for regurgitant aortic valve disease.

[0004] During TAVR surgery, the delivery system delivers the valve stent to the ascending main segment, and the valve stent body is compressed in the capsule cavity to be released. By controlling the advancement and rotation of the delivery system, the three positioning parts of the valve are inserted into the valve sinus, and then the valve is released.

[0005] Currently, regurgitant valves mostly adopt a forward release method, in which the capsule cavity is moved toward the ventricle by operating the handle to release the stent. In the process of retrieving the capsule cavity, due to the anatomical morphology of human vascular tissue, the capsule cavity often fits the greater curvature of the blood vessel. At this time, withdrawing the capsule cavity is likely to catch the bottom of the stent and carry the stent away. Summary of the invention

[0006] The present application mainly provides a valve stent delivery device and a valve delivery system to solve the problem that the existing valve stent delivery device is prone to carry away the valve stent when withdrawing the capsule cavity.

[0007] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a valve stent delivery device. The valve stent delivery device includes: an outer sheath tube; an inner sheath tube, which is movably arranged in the outer sheath tube, and a release wire is arranged in the inner sheath tube; a core tube, which is movably arranged in the inner sheath tube, and a fixed end is arranged at one end of the core tube, and a fixed claw and a recovery guide are also connected to the core tube, and the recovery guide is located between the fixed end and the fixed claw and is slidably connected to the core tube; the fixed end is used to connect the first end of the valve stent, and the release wire and the fixed claw are used to cooperate and connect the second end of the valve stent; a capsule assembly includes a capsule cavity and a traction line, the traction line is movably arranged in the core tube and one end is connected to the capsule cavity, and the capsule cavity is used to load the valve stent connected by the fixed end and the fixed claw; wherein the recovery guide is used to guide the capsule cavity to move into the outer sheath tube when the capsule cavity is recovered.

[0008] In some embodiments, the recovery guide comprises a base and a conical self-expanding portion, a small end of the conical self-expanding portion is connected to the base, and a large end of the conical self-expanding portion is away from the fixing claw;

[0009] The base is provided with an inner hole so as to be sleeved on the core tube, and the ratio of the diameter of the inner hole to the outer diameter of the core tube is 1 to 1.5.

[0010] In some embodiments, the ratio of the equivalent outer diameter of the large end of the conical self-expanding portion to the outer diameter of the opening of the capsule cavity is 1.1 to 1.5, and the ratio of the equivalent outer diameter to the inner diameter of the outer sheath is 0.9 to 1.0.

[0011] In some embodiments, the conical self-expanding portion includes a plurality of self-expanding rods distributed circumferentially around the base and in an open shape.

[0012] In some embodiments, the conical self-expanding portion further comprises a connecting wire connecting each of the self-expanding rods, the connecting wire is located outside the conical space defined by the plurality of self-expanding rods, and the connecting wire is a memory metal wire or a polymer elastic wire.

[0013] In some embodiments, the conical self-expanding portion further includes a covering layer disposed on the outside of each of the self-expanding rods, and the covering layer is a polymer elastic coating or a woven mesh woven from memory metal wires.

[0014] In some embodiments, the conical self-expanding portion is a woven mesh structure, and the woven mesh structure is woven from memory metal wires.

[0015] In some embodiments, the woven mesh structure includes a conical sub-mesh and a cylindrical sub-mesh, the small end of the conical sub-mesh is connected to the base, the large end of the conical sub-mesh is connected to the cylindrical sub-mesh, the weaving density of the conical sub-mesh is greater than the weaving density of the cylindrical sub-mesh; and the end of the cylindrical sub-mesh away from the conical sub-mesh is in an expanded shape.

[0016] In some embodiments, the core tube is further provided with two spaced-apart limiting members, the two limiting members are located between the fixed end and the fixed claw, and the base is slidably disposed between the two limiting members.

[0017] In some embodiments, the spacing between the stopper close to the fixed end and the fixed end is 10-30 mm, and the axial spacing between the two stoppers along the core tube is 1-20 mm.

[0018] In some embodiments, a first guide portion is provided on the core tube, and a second guide portion is provided on the base. The first guide portion cooperates with the second guide portion along the axial guidance of the core tube. The first guide portion is one of a slide rail and a slide groove, and the second guide portion is the other of the slide rail and the slide groove.

[0019] In order to solve the above technical problems, another technical solution adopted by the present application is: providing a valve delivery system comprising a valve stent and the valve stent delivery device as described above, wherein the valve stent delivery device is used to load and deliver the valve stent.

[0020] The beneficial effect of the present application is that, different from the prior art, the present application discloses a valve stent delivery device and a valve delivery system. In the present application, by setting the recovery guide to be movable, that is, the recovery guide is slidably arranged on the core tube, and while keeping the second end of the valve stent in a state of being connected by the release wire and the fixing claw, the capsule cavity is withdrawn, so that the capsule cavity can push the recovery guide to pass over the first end of the valve stent, avoiding the capsule cavity from hanging on the first end of the valve stent, and then releasing the release wire so that the valve stent can be fully unfolded and smoothly enter the sinus, effectively solving the problem of the valve stent being easily carried away when withdrawing the capsule cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0022] Figure 1It is a structural schematic diagram of an embodiment of a valve stent delivery device provided by the present application;

[0023] Figure 2 It is a schematic diagram of the structure of different states of the capsule cavity relative to the valve support and the recovery guide in the valve delivery system provided by the present application;

[0024] Figure 3 Yes Figure 1 A schematic diagram of the structure in which the capsule cavity and the recovery guide in the valve stent delivery device are moved to the outer sheath tube;

[0025] Figure 4 Yes Figure 1 A structural schematic diagram of an embodiment of a recovery guide member in a valve stent delivery device shown;

[0026] Figure 5 Yes Figure 1 A schematic structural diagram of another embodiment of a recovery guide member in a valve stent delivery device;

[0027] Figure 6 Yes Figure 1 A schematic structural diagram of another embodiment of a recovery guide member in a valve stent delivery device;

[0028] Figure 7 Yes Figure 1 A schematic diagram of the structure of the recovery guide member and the stop member in the valve stent delivery device;

[0029] Figure 8 Yes Figure 1 A schematic structural diagram of the guiding cooperation between the recovery guide and the core tube in the valve stent delivery device shown. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The terms "first", "second", "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] The present application provides a valve delivery system, in combination with Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of an embodiment of a valve stent delivery device provided by the present application, Figure 2 It is a schematic diagram of the structure of different states of the capsule cavity relative to the valve support and the recovery guide in the valve delivery system provided by the present application.

[0034] The valve delivery system 200 includes a valve stent 201 and a valve stent delivery device 100 . The valve stent delivery device 100 is used for loading and delivering the valve stent 201 .

[0035] The valve stent 201 is a self-expanding artificial valve device. When it is installed on the valve stent delivery device 100 and before being released, it is in a contracted state to reduce its volume for easy delivery along the vascular path. After being delivered to the treatment site and released, it can return to its normal state, self-expand and unfold between the left ventricle and the aorta, and the positioning pieces on it capture the leaflets into the sinuses, so that the leaflets on it can replace the native valve.

[0036] The valve stent 201 includes a stent, a valve skirt and valve leaflets. The valve skirt is connected to the inner side of the stent, and the valve leaflets are connected to the inner side of the valve skirt. A positioning piece is provided on the stent, and the positioning piece can capture the valve leaflets into the sinus after being released and expanded, thereby fixing the valve stent 201 so that the valve leaflets thereon can replace the native valve.

[0037] In this embodiment, Figure 1 As shown, the valve stent delivery device 100 includes an outer sheath tube 10, an inner sheath tube 20, a core tube 30 and a capsule assembly 40, wherein the inner sheath tube 20 is movably arranged in the outer sheath tube 10, and a release wire 21 is arranged in the inner sheath tube 20; the core tube 30 is movably arranged in the inner sheath tube 20, and one end of the core tube 30 is provided with a fixed end 31, and the core tube 30 is also connected to a fixed claw 32 and a recovery guide 33, and the recovery guide 33 is located between the fixed end 31 and the fixed claw 32 and is slidably connected to the core tube 30; the fixed end 31 is used to At the first end 202 connected to the valve stent 201, the release wire 21 and the fixing claw 32 are used to cooperate with the second end 203 connected to the valve stent 201; the capsule assembly 40 includes a capsule cavity 41 and a traction wire 42, the traction wire 42 is movably arranged in the core tube 30 and one end of which is connected to the capsule cavity 41, and the capsule cavity 41 is used to load the valve stent 201 connected by the fixing end 31 and the fixing claw 32; wherein, the recovery guide 33 is used to guide the capsule cavity 31 to move into the outer sheath tube 10 when recovering the capsule cavity 31.

[0038] The outer sheath tube 10, the inner sheath tube 20, the core tube 30 and the traction line 42 are sequentially arranged from the outside to the inside, wherein the traction line 42 can be a thread or a pipeline. For example, the traction line 42 is a steel cable, which is connected to the capsule cavity 41, and the connection method can be welding, injection molding or bonding, etc. The advancement and retraction of the capsule cavity 41 can be completed by controlling the traction line 42 by the corresponding functional handle.

[0039] The fixing end 31 and the fixing claw 32 are both connected to the core tube 30 and are respectively used to connect the first end 202 and the second end 203 of the valve stent 201 , wherein the fixing claw 32 cooperates with the release wire 21 to be connected to the second end 203 of the valve stent 201 .

[0040] The fixed end 31 is ring-shaped with multiple limiting grooves or limiting holes and other structures, which can be connected to the T-shaped pieces on the first end 202 of the valve stent 201. After the fixed end 31 and the first end 202 are loaded into the capsule cavity 41, the fixed end 31 and the first end 202 can remain connected.

[0041] The fixing claw 32 includes a plurality of arms, which are arranged corresponding to the release pieces on the second end 203 of the valve stent 201. When loading, the corresponding release wires 21 can pass through the holes on the release pieces and connect with the corresponding arms of the fixing claw 32. Each release wire 21 cooperates with the corresponding arm connection to achieve traction and regulation of each release piece on the second end 203 of the valve stent 201, so that the release position of the valve assembly 201 can be regulated by the unthreaded fixing claw 32 during surgery.

[0042] During the process of loading the valve stent 201 into the valve stent delivery device 100, the first end 202 of the valve stent 201 is connected to the fixed end 31, the second end 203 of the valve stent 201 is connected to the release wire 21 and the fixing claw 32, and the valve stent 201 is also compressed and loaded into the capsule cavity 41 together with the fixed end 31 and the fixing claw 32.

[0043] Among them, the recovery guide 33 is slidably set on the core tube 30 and is located between the fixed end 31 and the fixed claw 32; during the process of loading the valve stent 201, the recovery guide 33 is in the valve stent 201 and is loaded into the capsule cavity 41 in a compressed state.

[0044] After loading, the capsule cavity 41 of the valve stent delivery device 100 loaded with the valve stent 201 can be delivered to the treatment site via the vascular path determined by the guide wire, and then the valve stent 201 is released.

[0045] The process of releasing the valve stent 201 is as follows: the core tube 30 is driven to withdraw through the corresponding handle so that the valve stent 201 gradually withdraws from the capsule cavity 41, wherein the second end 203 of the valve stent 201 first withdraws from the capsule cavity 41, and the withdrawn portion of the valve stent 201 gradually self-expands from a compressed state, and the withdrawn fixing claw 32 also gradually self-expands from a compressed state, and the second end 203 still maintains a connection state with the release wire 21 and the fixing claw 32. After the first end 202 and the fixing end 31 of the valve stent 201 withdraw from the capsule cavity 41, the first end 202 and the fixing end 31 are released from contact and connection and self-expand and unfold, and the recovery guide 33 also self-expands and unfolds to its original state; at this time, Figure 2As shown in (a) and (b), when the release wire 21 is not released from the connection with the fixing claw 32, the traction wire 42 can be driven by the corresponding handle to withdraw the capsule cavity 41, so that the capsule cavity 41 first crosses the first end 202 of the valve stent 201, and then withdraws by pushing the recovery guide 33 to enter the internal space of the valve stent 201; and when the capsule cavity 41 hangs on the first end 202 of the valve stent 201 during this process, the resistance generated by the recovery capsule cavity 41 hanging on the first end 202 of the valve stent 201 will be transmitted to the surgeon, and at this time, the release wire 21 is not released, and the second end 203 of the valve stent 201 is still fixed by the fixing claw 32, so the capsule cavity 41 is restricted by the fixing claw 32. 1 will not bring the valve stent 201 flying, and the distance of the reverse forward end of the capsule cavity 41 can be adjusted by the traction line 42 to detach from the first end 202 of the valve stent 201, and the posture of the valve stent 201 can be appropriately adjusted by driving the core tube 30, and then the capsule cavity 41 is retracted again, so that the capsule cavity 41 crosses the first end 202 of the valve stent 201, and then the recovery guide 33 can be pushed back to make the capsule cavity 41 enter the valve stent 201, avoiding hanging on the first end 202 of the valve stent 201, and then after the position of the valve stent 201 is corrected to the right position, the connection state between the release wire 21 and the fixing claw 32 is released, so that the valve stent 201 is fully deployed and smoothly enters the sinus.

[0046] See also Figure 3 , Figure 3 Yes Figure 1 The capsule cavity 201 and the recovery guide 33 in the valve stent delivery device are moved to the outer sheath tube. After the valve stent 201 is released, the capsule cavity 201 can be further withdrawn and moved to the outer sheath tube 10 together under the guidance of the recovery guide 33.

[0047] See also Figure 4 , Figure 4 Yes Figure 1 The schematic diagram of the structure of an embodiment of a recovery guide in a valve stent delivery device is shown. In this embodiment, the recovery guide 33 includes a base 330 and a conical self-expanding portion 332, the small end of the conical self-expanding portion 332 is connected to the base, and the large end of the conical self-expanding portion 332 is located on the side of the base 330 away from the fixed claw 32; wherein the base 330 is provided with an inner hole to be sleeved on the core tube 30, and the ratio of the diameter of the inner hole to the outer diameter of the core tube is 1 to 1.5.

[0048] The base 330 cooperates with the hole axis of the core tube 30. By setting the ratio of the inner hole diameter of the base 330 to the outer diameter of the core tube 30 to 1 to 1.5, the recovery guide 33 can be prevented from shaking significantly in the circumferential direction of the core tube 30 and can slide smoothly on the core tube 30.

[0049] Optionally, the ratio of the diameter of the inner hole of the base 330 to the outer diameter of the core tube 30 is 1, 1.1, 1.2, 1.3, 1.4 or 1.5.

[0050] The conical self-expanding portion 332 is a self-expanding part, which can be compressed so that it can be accommodated in the capsule cavity 41 along with the valve stent 201. After withdrawing the capsule cavity 41, it can self-expand and unfold into a conical part, and the capsule cavity 41 can enter the large end of the conical self-expanding portion 332. Then, when the base 330 and the conical self-expanding portion 332 are gradually accommodated in the outer sheath tube 10, the conical self-expanding portion 332 can also accurately guide the capsule cavity 41 to be accommodated in the outer sheath tube 10, thereby avoiding the capsule cavity 41 and the outer sheath tube 10 from being misaligned and making it difficult for the capsule cavity 41 to enter the outer sheath tube 10.

[0051] Furthermore, the ratio of the equivalent outer diameter of the large end of the conical self-expandable portion 332 to the opening outer diameter of the capsule cavity 41 is 1.1 to 1.5, so that the large end of the conical self-expandable portion 332 can well accommodate the end of the capsule cavity 41 while reducing interference with the released valve stent 201.

[0052] Optionally, the ratio of the equivalent outer diameter of the large end of the conical self-expanding portion 332 to the opening outer diameter of the capsule cavity 41 may be 1.1, 1.2, 1.3, 1.4 or 1.5.

[0053] Furthermore, the ratio of the equivalent outer diameter of the large end of the conical self-expanding portion 332 to the inner diameter of the outer sheath tube 10 is 0.9 to 1.0, so that the conical self-expanding portion 332 can be accommodated in the outer sheath tube 10 and can also guide the capsule cavity 41 to be accommodated in the outer sheath tube 10.

[0054] Optionally, the ratio of the equivalent outer diameter of the large end of the conical self-expandable portion 332 to the inner diameter of the outer sheath tube 10 is 0.9, 0.95 or 1.0.

[0055] By limiting the ratio of the equivalent outer diameter of the large end of the self-expanding portion 332 to the opening outer diameter of the capsule cavity 41 and the ratio of the equivalent outer diameter of the large end of the conical self-expanding portion 332 to the inner diameter of the outer sheath tube 10, it can be ensured that the large end of the conical self-expanding portion 332 can accommodate the end of the capsule cavity 41 and can be smoothly withdrawn into the outer sheath tube 10 together.

[0056] Continue reading Figure 4 In some embodiments, the conical self-expanding portion 332 includes a plurality of self-expanding rods 334 distributed circumferentially around the base 330 , and the self-expanding rods 334 include a guide rod portion 335 , one end of which is connected to the base 330 and is open relative to the core tube 30 .

[0057] The conical space is formed by a plurality of self-expanding rods 334 distributed circumferentially around the base 330 , and its large end can accommodate the end of the capsule cavity 41 . After each expansion rod 334 gradually enters the outer sheath tube 10 , it simultaneously guides the capsule cavity 41 to align with the outer sheath tube 10 and enter the outer sheath tube 10 .

[0058] Furthermore, the self-expanding rod 334 may also include a clamping rod 336 connected to the other end of the guide rod 335, and the clamping rod 336 is relatively parallel to the core tube 30. That is, the large end of the conical self-expanding portion 332 is formed by a plurality of clamping rods 336. By providing the clamping rods 336, the capsule cavity 41 can be better limited and guided, and the risk of the end of the self-expanding rod 334 hooking the grid on the valve stent 201 can be effectively reduced.

[0059] Optionally, the tapered self-expanding portion 332 further includes a connecting wire 337 connecting the respective expansion rods 334 , and the connecting wire 337 is located outside the tapered space defined by the plurality of self-expanding rods 334 .

[0060] The connecting wire 330 circumferentially connected to the outer side of each expansion rod 334 can enable each expansion rod 334 to provide support force to each other to ensure that the recovery guide member 33 will not be overturned when the capsule cavity 41 is withdrawn, specifically to ensure that the conical self-expansion part 332 will not be overturned.

[0061] The connecting wire 337 is a memory metal wire or a polymer elastic wire, which can be in a wavy line shape when compressed, so as to be compressed into the capsule cavity 41. The connecting wire 337 can alternately pass through each expansion rod 334, and play the role of connecting each relatively independent self-expansion rod 334 on the recovery guide 33 to increase the anti-overturning ability. Multiple layers of the connecting wire 337 can be arranged at intervals on the outside of each expansion rod 334 to make the anti-overturning ability of the tapered guide part 332 reliable.

[0062] Optionally, the conical self-expanding portion 332 further includes a covering layer (not shown) arranged on the outside of each expansion rod 334 , and the covering layer is wrapped around the outside of each expansion rod 334 , which can relatively more effectively increase the anti-overturning capability of the conical self-expanding portion 332 .

[0063] The covering layer can be a polymer elastic film or a woven mesh woven from memory metal wire. The polymer elastic film can be, for example, a polyester or polyester material film. The covering layer can also connect the respective expansion rods 334 to form a whole, thereby having a stronger anti-overturning ability.

[0064] See also Figure 5 and Figure 6 , Figure 5 Yes Figure 1 The structure diagram of another embodiment of the recovery guide member in the valve stent delivery device shown in FIG. Figure 6Yes Figure 1 FIG. 1 is a schematic diagram of another embodiment of the recovery guide member in the valve stent delivery device. In another embodiment, the conical self-expanding portion 332 is a braided mesh structure, which is braided with memory metal wires. The braided mesh structure is conical in shape to play the same role as the above-mentioned multiple self-expanding rods 334.

[0065] In other words, the entire conical self-expanding portion 332 is woven from memory metal wires, which makes it more integrated and more resistant to bending.

[0066] In this embodiment, the woven mesh structure includes a conical subnet 338 and a cylindrical subnet 339. The small end of the conical subnet 338 is connected to the base 330, and the large end of the conical subnet 338 is connected to the cylindrical subnet 339. The weaving density of the conical subnet 338 is greater than the weaving density of the cylindrical subnet 339.

[0067] The cylindrical subnet 339 can better accommodate the end of the capsule cavity 41. At the same time, the weaving density of the conical subnet 338 is greater than that of the cylindrical subnet 339, ensuring that the entire conical self-expanding portion 332 has a stronger ability to resist deformation when blood flow impacts.

[0068] Furthermore, if Figure 6 As shown, one end of the cylindrical subnet 339 away from the conical subnet 338 is expanded to prevent the end from interfering with the withdrawal of the capsule cavity 41, so that the capsule cavity 41 can be more easily withdrawn into the cylindrical subnet 339.

[0069] See also Figure 7 , Figure 7 Yes Figure 1 The schematic diagram of the structure of the recovery guide and the stopper in the valve stent delivery device shown. Further, based on the above embodiment, the core tube 30 is further provided with two spaced stoppers 35, the two stoppers 35 are located between the fixed end 31 and the fixed claw 32, and the base 330 is slidably disposed between the two stoppers 35.

[0070] The stopper 35 can be a polymer annular material or a metal material, which can be bonded or welded to the core tube 30. The stopper 35 can be a protruding structure such as an annular or block shape, which can limit the extreme positions on both sides of the recovery guide 33.

[0071] The movable travel of the recovery guide 33 is limited by two limit members 35 to prevent the recovery guide 33 from crossing the valve opening area of ​​the valve stent 201 due to the impact of blood flow and damaging the valve when the valve is open or closed.

[0072] The spacing between the stopper 35 near the fixed end 31 and the fixed end 31 is 10-30 mm, and the axial spacing between the two stoppers 35 along the core tube 30 is 1-20 mm. Within these two numerical ranges, the recovery guide 33 can be effectively prevented from damaging the valve due to movement.

[0073] The spacing between the stopper 35 near the fixed end 31 and the fixed end 31 may be 10 mm, 15 mm, 20 mm, 25 mm or 30 mm, and the axial spacing between the two stoppers 35 along the core tube 30 may be 1 mm, 5 mm, 10 mm, 15 mm or 20 mm.

[0074] See also Figure 8 , Figure 8 Yes Figure 1 A schematic structural diagram of the guiding cooperation between the recovery guide and the core tube in the valve stent delivery device shown.

[0075] Furthermore, a first guide portion 361 is provided on the core tube 30 , and a second guide portion 362 is provided on the base 330 . The first guide portion 361 cooperates with the second guide portion 362 along the axial direction of the core tube 30 .

[0076] The first guide portion 361 exists at least between two limit members 35. When the first guide portion 361 cooperates with the second guide portion 362, the base 330 can only slide along the axial direction of the core tube 30 but cannot rotate, thereby preventing the recovery guide member 33 from rotating in the circumferential direction.

[0077] Specifically, the first guide portion 361 is one of a slide rail and a slide groove, and the second guide portion 362 is the other of the slide rail and the slide groove. For example, the first guide portion 361 is a slide rail disposed on the surface of the core tube 30, which is parallel to the axial direction of the core tube 30, and the second guide portion 362 is a slide groove disposed on the base 330, which slides in cooperation with the slide rail.

[0078] The first guide portion 361 may be formed by bonding a polymer thin tube material to the core tube 30, or it may be a groove processed on the core tube 30, and the second guide portion 362 on the base 330 may be formed by integral cutting.

[0079] In the present application, the recovery guide 33 is set to be movable, that is, the recovery guide 33 is slidably set on the core tube 30, and while the second end 203 of the valve stent 201 is kept in a state of being connected by the release wire 21 and the fixing claw 32, the capsule cavity 41 is retracted so that the capsule cavity 41 can push the recovery guide 33 to pass over the first end 202 of the valve stent 201, thereby avoiding the capsule cavity 41 from hanging on the first end 202 of the valve stent 201, and then the release wire 21 is released so that the valve stent 201 can be fully unfolded and smoothly enter the sinus.

[0080] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A valve stent delivery device, characterized in that: include: Outer sheath; An inner sheath tube is movably inserted into the outer sheath tube, and a release wire is inserted into the inner sheath tube; A core tube is movably arranged in the inner sheath tube, one end of the core tube is provided with a fixed end, and the core tube is also connected with a fixed claw and a recovery guide, the recovery guide is located between the fixed end and the fixed claw and is slidably connected to the core tube; the fixed end is used to connect the first end of the valve stent, and the release wire and the fixed claw are used to cooperate and connect the second end of the valve stent; A capsule assembly, comprising a capsule cavity and a traction line, wherein the traction line is movably arranged in the core tube and one end of the traction line is connected to the capsule cavity, and the capsule cavity is used to load the valve stent connected by the fixed end and the fixed claw; Wherein, the recovery guide is used to guide the capsule cavity to move into the outer sheath tube when the capsule cavity is recovered.

2. The valve stent delivery device according to claim 1, characterized in that: The recovery guide comprises a base and a conical self-expanding portion, wherein a small end of the conical self-expanding portion is connected to the base, and a large end of the conical self-expanding portion is away from the fixing claw; The base is provided with an inner hole so as to be sleeved on the core tube, and the ratio of the diameter of the inner hole to the outer diameter of the core tube is 1 to 1.

5.

3. The valve stent delivery device according to claim 2, characterized in that: The ratio of the equivalent outer diameter of the large end of the conical self-expanding portion to the outer diameter of the opening of the capsule cavity is 1.1 to 1.5, and the ratio of the equivalent outer diameter to the inner diameter of the outer sheath tube is 0.9 to 1.

0.

4. The valve stent delivery device according to claim 2, characterized in that: The conical self-expanding portion includes a plurality of self-expanding rods which are distributed circumferentially around the base and are in an open shape.

5. The valve stent delivery device according to claim 4, characterized in that: The conical self-expanding portion further comprises a connecting wire connecting the self-expanding rods, the connecting wire is located outside the conical space defined by the plurality of self-expanding rods, and the connecting wire is a memory metal wire or a polymer elastic wire.

6. The valve stent delivery device according to claim 4, characterized in that: The conical self-expanding portion further comprises a covering layer arranged on the outside of each of the self-expanding rods, and the covering layer is a polymer elastic coating or a woven mesh woven from memory metal wires.

7. The valve stent delivery device according to claim 2, characterized in that: The conical self-expanding portion is a woven mesh structure, and the woven mesh structure is woven from memory metal wires.

8. The valve stent delivery device according to claim 7, characterized in that: The woven mesh structure includes a conical subnet and a cylindrical subnet, the small end of the conical subnet is connected to the base, the large end of the conical subnet is connected to the cylindrical subnet, and the weaving density of the conical subnet is greater than that of the cylindrical subnet; wherein one end of the cylindrical subnet away from the conical subnet is in an expanded shape.

9. The valve stent delivery device according to claim 2, characterized in that: The core tube is also provided with two spaced apart limiting members, the two limiting members are located between the fixed end and the fixed claw, and the base is slidably arranged between the two limiting members.

10. The valve stent delivery device according to claim 9, characterized in that: The spacing between the limiting member close to the fixed end and the fixed end is 10-30 mm, and the axial spacing between the two limiting members along the core tube is 1-20 mm.

11. The valve stent delivery device according to claim 2, characterized in that: The core tube is provided with a first guide portion, the base is provided with a second guide portion, and the first guide portion cooperates with the second guide portion along the axial direction of the core tube; The first guide portion is one of a slide rail and a slide groove, and the second guide portion is the other of the slide rail and the slide groove.

12. A valve delivery system, characterized in that: The valve delivery system comprises a valve stent and a valve stent delivery device as described in any one of claims 1 to 11, and the valve stent delivery device is used for loading and delivering the valve stent.

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