CN212395135U - Valve support and artificial heart valve comprising same - Google Patents

Abstract

The utility model discloses a valve support, which comprises a support component, wherein the support component comprises at least two supports, an inner support and an outer support, the inner support and the outer support are of an inner-outer nested structure, the support component is constructed to be provided with at least one sheathing end group, the sheathing end group comprises a first sheathing end and a second sheathing end, and the second sheathing end is positioned outside the first sheathing end; and at least one sheathing end group, wherein the length of the first sheathing end is greater than that of the second sheathing end, and the sheathing end group is provided with a bulge part for preventing the sheathing end group from interfering with the loading of the valve prosthesis. The utility model also provides a prosthetic heart valve. The utility model discloses a valve support, thereby the bulge can avoid outer support's second to go into sheath end and touch sheath pipe tip influence and load, has reduced and has loaded resistance and the interbedded risk of sheath pipe entering.

Description

Valve support and artificial heart valve comprising same

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a valve stent and a prosthetic heart valve implanted in the heart.

Background

Heart valves are membranous structures that can be opened and closed inside the organs of humans or some animals. Each individual has four valves in the heart. Namely, the aortic valve, which joins the left ventricle and the aorta, the pulmonary valve, which joins the right ventricle and the pulmonary artery, the mitral valve, which joins the left atrium and the left ventricle, and the tricuspid valve, which joins the right atrium and the right ventricle. They all act as one-way valves, allowing blood to flow only from one direction to the other, but not back.

Mitral regurgitation can lead to myocardial remodeling, progressive enlargement of the ventricles, and ultimately heart failure. Transcatheter mitral valve replacement surgery (TMVR) employs a catheter-based approach to extracorporeally compress a prosthetic valve to a delivery system for delivery to the mitral annulus of a human subject, and release-secure the prosthetic valve at the mitral annulus to replace the native valve. Compared with the surgical operation, the TMVR does not need an extracorporeal circulation auxiliary device, has small wound and quick recovery of the patient, and can obviously improve the hemodynamics index of the postoperative patient.

For patients with partial mitral regurgitation, the implanted therapeutic effect of conventional single-layer mitral prosthetic valves is not ideal. For the multilayer mitral valve prosthesis valve, the valve can distribute the functions of bearing the artificial valve leaflets, anchoring, sealing and the like to different single-layer valve components, thereby achieving the purposes of not influencing the normal operation of other structures of the heart and better playing the implantation treatment function.

The loading of multi-layered stents often encounters difficulty, and as shown in fig. 11 and 12, is a double-layered stent structure, and when the length of the sheath-entering end of the inner stent is longer than that of the outer stent, a gradient of the sheath-entering end surface is formed between the inner stent and the outer stent. When loading, the terminal surface of sheath pipe can be touchd to the terminal surface of outer support, and two terminal surfaces are inconsistent to influence whole valve and get into the sheath pipe, it is big to load the resistance, and outer support is fragile to injure the sheath pipe, has the risk that the sheath pipe got into two-layer support intermediate layer. During the implantation process, if the implant needs to be recovered and released, the recovery resistance of the end part is large, which also influences the smooth proceeding of the recovery.

SUMMERY OF THE UTILITY MODEL

The utility model provides a valve support has eliminated the gradient of going into the sheath terminal surface between the double-deck support, thereby avoids outer support's tip to touch sheath pipe tip and influence the support and get into the sheath pipe, has reduced loading resistance and sheath pipe and has got into interbedded risk.

The technical scheme of the utility model as follows:

a valve stent comprises a stent component, wherein the stent component comprises at least two stents, an inner stent and an outer stent, the inner stent and the outer stent are in an inner-outer nested structure, the inner stent is sleeved inside, and the stent component is constructed to have at least one sheathing end group;

the sheathing end group comprises a first sheathing end and a second sheathing end, the first sheathing end is located on the inner-layer stent, the second sheathing end is located on the outer-layer stent, the first sheathing end and the second sheathing end extend towards the same direction, the second sheathing end is located on the outer side of the first sheathing end, and when the length of the first sheathing end is larger than that of the second sheathing end in at least one sheathing end group, the sheathing end group is provided with a protruding part to prevent the sheathing end group from interfering with the loading of the valve prosthesis.

Because there is the gradient difference between the sheath end in first income sheath end and the second, when valve prosthesis pressed and held into the sheath, the terminal surface of sheath end was gone into to the second can touch conveying system like the terminal surface of sheath pipe, and two terminal surfaces are inconsistent, lead to the loading resistance big to influence whole valve prosthesis and get into the sheath pipe, and the sheath pipe is easily hindered to the sheath end is gone into to the second, still can appear the sheath pipe and get into the risk of inner and outer support intermediate layer in addition. The protruding part relieves the interference of the sheathing end group on the loading of the valve prosthesis, and reduces the risk that the sheath tube enters the interlayer of the inner and outer brackets and the risk that the end surface of the second sheathing end collides with the sheath tube during the loading.

One end of the valve prosthesis firstly enters the delivery system, and the end which firstly enters the delivery system is the sheathing end. The first sheathing end can be a hanging lug arranged on the inner layer support, and the support component is connected with the conveying system through the hanging lug. The specific structure and function of the first sheathing end and the second sheathing end are not used to limit the protection scope of the present invention.

Depending on the delivery system configuration and the manner of delivery, the valve prosthesis may be sheathed end-first, e.g., ventricular end-first, or atrial end-first. When the conveying system such as a sheath tube is of a two-section structure, the atrial end and the ventricular end of the bracket component are simultaneously used as sheathing ends and loaded into the conveying system.

Preferably, the stent component comprises a plurality of the sheathing end groups, each of the sheathing end groups is positioned at an atrial end or a ventricular end, the sheathing end groups can ensure that the valve prosthesis is stably loaded in the delivery system, and the sheathing end groups can be positioned at the atrial end, the ventricular end or the atrial end and the ventricular end respectively; in each of the sheathing end groups, when the length of the first sheathing end is longer than that of the second sheathing end, the protrusion is disposed in each of the sheathing end groups. Each bulge can release the interference of the sheathing end group to the sheathing process.

Preferably, the protrusion is disposed at the first sheathing end, the protrusion has a first end surface, the first end surface is located on one side of the end surface close to the second sheathing end, and the width of the first end surface is not less than the width of the second sheathing end. At the moment, due to the stopping function of the protruding part, the sheath tube cannot enter the interlayer between the first sheath entering end and the second sheath entering end, and therefore the risk that the sheath tube enters the interlayer of the inner support and the outer support is reduced.

Preferably, the protruding portion further has a second end face located on a side away from the first end face, and the second end face is flush with the end face of the first sheathing end. At this moment, the first sheath end of going into has been eliminated to the bulge and the second is gone into the gradient difference between the sheath end, has further reduced the sheath pipe and has got into the interbedded risk of inner and outer support, and when the length of the first terminal surface of bulge is greater than or equal to the second and goes into the width of sheath end, the second goes into the terminal surface of sheath end and can not touch sheath pipe terminal surface to avoided the second to go into the phenomenon that the terminal surface of sheath end contradicts with sheath pipe terminal surface, reduced the loading resistance, avoided the second to go into the sheath end simultaneously and damaged the sheath pipe.

Preferably, the first end surface of the protruding part abuts against an end surface of the second sheathing end. Due to the propping action from the convex part, the sheath tube can not enter the bracket interlayer from the end part of the second sheath entering end when entering the sheath.

Preferably, the first end face matches an end face of the second sheath-in end. The matching refers to the same size, and the shape of the end face is matched in a concave-convex mode, so that when the protruding portion is abutted against the end face of the second sheathing end, the sheathing end group can form an integral sheathing, the loading of the valve prosthesis is easier, and the risk that the second sheathing end damages the sheath tube is reduced.

Preferably, the outer contour of the protrusion is circular arc. The circular arc-shaped outer contour reduces the friction between the circular arc-shaped outer contour and the end part of the sheath tube and the wall of the sheath tube, and reduces the loading resistance.

Preferably, the protruding part is integrally formed at the first sheathing end, the forming process is simple, and the connection between the protruding part and the first sheathing end is more stable and reliable.

Preferably, the first sheathing end is a hanger connected with a delivery system. When the length of the first sheath-entering end of the inner-layer bracket is longer, the inner-layer bracket is preferably connected with the conveying system through the hanging lugs of the inner-layer bracket, and the inner-layer bracket is more reliable and stable.

Preferably, the axial contact surfaces of the first sheathing end and the second sheathing end are configured to be in concave-convex matching connection. When the valve stent is formed, in each sheathing end group, the first sheathing end and the second sheathing end can be pre-formed in a welding mode and the like, and the concave-convex matching connection can replace a welding connection mode, so that the valve stent has the advantages of stable connection and easiness in implementation.

A prosthetic heart valve comprising a valve stent as described in any preceding claim.

Compared with the prior art, the beneficial effects of the utility model are as follows:

firstly, the convex part of the utility model relieves the interference of the sheath end group on the loading of the valve prosthesis, and reduces the risk that the sheath tube enters the interlayer of the inner and outer brackets and the risk that the end surface of the second sheath end collides with the sheath tube during the loading; the protruding part is arranged at the first sheathing end, and when the length of the first end face is not less than the width of the second sheathing end, the protruding part can effectively prevent the sheath from entering the bracket interlayer; when the second end face of the protruding part is level with the end face of the first sheathing end, the protruding part eliminates the gradient difference between the first sheathing end and the second sheathing end, and the end face of the second sheathing end cannot touch the end face of the sheath tube, so that the end face of the second sheathing end is prevented from being collided with the end face of the sheath tube, the loading resistance is reduced, and the risk of damaging the sheath tube is reduced.

Secondly, when the first end face of the protruding part abuts against the end face of the second sheathing end and the first end face is matched with the end face of the second sheathing end, the integrity of the sheathing end group is improved, the risk that the second sheathing end damages the sheath is further reduced, and the smooth loading, transportation and release of the valve prosthesis and the smooth recovery of the sheath can be ensured; when the outer contour of the convex part is arc-shaped, the arc-shaped outer contour reduces the friction between the convex part and the end part of the sheath tube and the wall of the sheath tube, and the loading resistance is further reduced.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

Fig. 1 is a schematic structural view of a bracket assembly according to embodiment 1 of the present invention;

fig. 2 is a schematic structural view of an inner layer bracket according to embodiment 1 of the present invention;

fig. 3 is a schematic structural view of an outer bracket of embodiment 1 of the invention;

fig. 4 is a schematic structural view of the sheathing end group according to embodiment 1 of the present invention;

FIG. 5 is a partial schematic structural view of the first sheathing end of embodiment 1 of the present invention;

fig. 6 is a schematic partial cross-sectional view of a valve prosthesis according to example 1 of the present invention;

fig. 7 is a schematic partial cross-sectional view of the valve prosthesis of example 1 of the present invention sheathed;

fig. 8 is a schematic cross-sectional view of the sheathing end group according to embodiment 1 of the present invention;

fig. 9 is a schematic cross-sectional view of the sheathing end group according to embodiment 2 of the present invention;

fig. 10 is a schematic cross-sectional view of the sheathing end group according to embodiment 3 of the present invention;

FIG. 11 is a schematic view of a prior art valve stent and sheath insertion end of the present invention;

fig. 12 is a schematic view of a part of the structure of the valve prosthesis according to the prior art of the present invention.

Reference numerals: a bracket assembly 100; an inner layer support 110; an outer layer support 120; an inflow section 111; an outflow section 113; a transition section 112; a first segment 121; a second section 122; a third segment 123; a sheathing end group 101; a first sheath-in end 114; a second sheath-in end 124; the projection 200; a sheath 410; a first end face 201; a second end face 202; an end face 1141 of the first in-sheath end; end face 1241 of the second sheath-entering end.

Detailed Description

The utility model provides a valve support and contain this valve support's artificial heart valve.

The utility model discloses a prosthetic heart valve can be used to implant in the left ventricle inflow canal, replaces native mitral valve, also can be used as tricuspid valve, implants in the right ventricle inflow canal.

The structure of the heart valve prosthesis according to the present invention is illustrated below by taking a mitral valve as an example, wherein the heart valve comprises a stent assembly 100, a valve and a skirt.

As shown in fig. 1, the bracket assembly 100 is composed of an inner bracket 110 and an outer bracket 120, wherein the inner bracket 110 and the outer bracket 120 are nested inside and outside, the inner bracket 110 is sleeved inside, and the outer bracket 120 is sleeved outside. The inner layer bracket 110 and the outer layer bracket 120 are connected by riveting, welding, buckling, sewing, skirt coating and the like.

As shown in fig. 2, the inner stent 110 includes an inflow section 111, an outflow section 113, and a transition section 112 therebetween, and optionally, the inner stent 110 further includes a hanging ear. The outflow section 113 is located at the downstream of the inflow channel according to the direction of blood flow, the hangers are connected with the end part of the stent inflow section 111 and/or the end part of the outflow section 113, and the hangers are used for being connected with the delivery system, so that the relative positions of the valve prosthesis and the delivery system are unchanged when the valve is loaded into the delivery system, released and separated from the delivery system and transported in vivo in the delivery system.

The cross-sectional shape of the inner stent 110 may be circular, D-shaped, flower-shaped, or other irregular shapes. The inner stent 110 may be made of, for example, nitinol, titanium alloy, cobalt chromium alloy, MP35n, 316 stainless steel, L605, Phynox/Elgiloy, platinum chromium, or other biocompatible metals as known to those skilled in the art. Optionally, an elastically or plastically deformable material is also included, such as a balloon expandable, or may be a shape memory alloy that is responsive to temperature changes to transition between a contracted delivery state and an expanded deployed state. Preferably, the pipe is made of nickel-titanium alloy through cutting, the outer diameter of the pipe is 4-13 mm, and the diameter size after shaping is selected according to actual needs. The inner layer support 110 may be a net structure composed of a plurality of rows of cells, and the cells are triangular, rhombic, pentagonal, drop-shaped, etc. and may form a closed-shaped mesh cell, preferably a rhombic structure.

As shown in fig. 3, the outer stent 120 includes a first segment 121, a second segment 122, and a third segment 123. Optionally, outer bracket 120 further includes a securing ear disposed on either end, or both ends, of outer bracket 120. The fixing lug is used for being connected with the delivery system, so that the relative positions of the valve prosthesis and the delivery system are unchanged when the valve is loaded into the delivery system, released and separated from the delivery system and transported in vivo in the delivery system.

The fixing lug and the hanging lug are connected with the conveying device when the valve stent is integrally loaded, one or both of the fixing lug and the hanging lug can be selected according to release requirements, and the fixing lug and the hanging lug can be positioned at any end part of the stent and are not limited to the outflow section part.

The cross-sectional shape of the outer stent 120 may be circular, D-shaped, flower-shaped, or other irregular shapes. The outer stent 120 may be made of, for example, nitinol, titanium alloy, cobalt chromium alloy, MP35n, 316 stainless steel, L605, Phynox/Elgiloy, platinum chromium, or other biocompatible metals as known to those skilled in the art. Optionally, an elastically or plastically deformable material is also included, such as a balloon expandable, or may be a shape memory alloy that is responsive to temperature changes to transition between a contracted delivery state and an expanded deployed state. The outer layer support 120 may be a net structure composed of multiple rows of cells, which are triangular, rhombic, pentagonal, drop-shaped, etc. mesh cells that can form a closed shape.

The valve comprises at least two artificial valve leaflets, which are prepared by animal pericardium or other biocompatible polymer materials, one ends of the valve leaflets are directly or indirectly stably connected with the inner layer bracket 110, and the other ends of the valve leaflets are free ends. The number of leaflets may be the same as or different from the number of native leaflets. When the heart valve is in a working state, the artificial valve leaf replaces the native valve leaf to realize the function of opening and closing the blood channel.

The entire inner or outer surface or both surfaces of the stent assembly 100 are covered with skirts to provide a sealing function and ensure that a single passage for blood flows from the inflow end of the prosthetic leaflet to the outflow end of the prosthetic leaflet. The skirt is made of pericardium or other biocompatible polymer material (such as PET (polyethylene terephthalate), PTFE (polytetrafluoroethylene) and the like).

The utility model discloses in not injecing the anchor form of valve prosthesis, can set up the flange on bracket component 100, adopt the anchor form of Oversize, also can set up anchor structures such as thorn, fluke on bracket component 100 and snatch native tissue, also can take tether anchor to fix to the mode of ventricular wall.

The present disclosure is merely illustrative of mitral valve prostheses, but is not limited to aortic valve prostheses, pulmonary valve prostheses, tricuspid valve prostheses, etc., of similar construction.

As shown in fig. 11 and 12, the prior art has a problem that when the length of the sheathing end of the inner stent assembly 100 is greater than that of the sheathing end of the outer stent 120, a gradient of sheathing end surfaces is formed between the inner and outer stents. When loading, the end face of the sheath entering end of the outer stent 120 can touch the end face of the sheath, the two end faces are in contact with each other, so that the whole valve is influenced to enter the sheath, the loading resistance is large, and the sheath entering end of the outer stent 120 is easy to damage the sheath. During the implantation process, if the implant needs to be recovered and released, the recovery resistance of the end part is large, which also influences the smooth proceeding of the recovery.

In addition, when the sheathing end of the inner and outer stents has gradient difference, the risk that the sheath tube enters the interlayer of the two stents, even the risk that the sheath tube enters the interlayer of the inner and outer stents, exists.

Therefore, the utility model provides a valve support and valve prosthesis can solve foretell problem.

In the description of the present invention, it should be noted that, since one or both ends of the valve prosthesis need to be loaded into the delivery system during the loading process, the end that first enters the delivery system is the "sheath end". The term "sheathing end" is to be understood in a broad sense as an end structure arranged at the atrial end or the ventricular end of the valvular prosthesis, such as the "hangers" or "fixation ears" described above.

In the description of the present invention, it should be noted that "atrial end" refers to the end located in the atrium, and "ventricular end" refers to the end located in the ventricle. As used herein, "heart valve," "valve prosthesis," and "prosthetic heart valve" have the same meaning.

In the description of the present invention, it should be noted that "outside" refers to a direction radially outward from the center of the valve prosthesis. As used herein, "length" refers to the dimension in the axial direction and "width" refers to the dimension in the radial direction.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As used in this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.

The present invention will be further described with reference to the following specific examples.

Example 1

The present embodiment provides a valve stent, which includes a stent component 100, see fig. 1 to 8, wherein the stent component 100 includes two stents, an inner stent 110 and an outer stent 120, the inner stent 110 and the outer stent 120 are in an inside-outside nested structure, the inner stent 110 is sleeved inside, and the outer stent 120 is sleeved outside.

The stent assembly 100 is configured with at least one sheathing end group 101, wherein the at least one sheathing end group 101 comprises a first sheathing end 114 and a second sheathing end 124, wherein the first sheathing end 114 is located on the inner stent 110, the second sheathing end 124 is located on the outer stent 120, the first sheathing end 114 and the second sheathing end 124 extend in the same direction, and the second sheathing end 124 is located outside the first sheathing end 114.

In at least one of the sheathing end groups 101, the length of the first sheathing end 114 is greater than the length of the second sheathing end 124, wherein at least one of the sheathing end groups 101 is provided with at least one protrusion 200 for preventing the sheathing end group 101 from interfering with the loading of the valvular prosthesis.

Because the second sheathing end 124 is located outside the first sheathing end 114, when the length of the first sheathing end 114 is greater than that of the second sheathing end 124, that is, there is a gradient difference between the two sheathing ends, the end surface of the second sheathing end 124 on the outer side will touch the end surface of the sheath tube 410 during sheathing, and the two end surfaces will touch each other, resulting in large loading resistance, and thus affecting the whole valvular prosthesis to enter the sheath tube 410.

The protrusion 200 can prevent the sheath 410 from entering the gap between the first sheathing end 114 and the second sheathing end 124, or prevent the end surface of the sheath 410 from interfering with the end surface of the second sheathing end 124, which may affect sheathing of the valvular prosthesis.

In the embodiment, the ventricular end of the valve prosthesis is firstly sheathed, namely the ventricular end is used as a sheathing end. The first sheathing end 114 is a hanging lug arranged at the ventricular end of the inner stent 110, the first sheathing end 114 is sheathed firstly, the hanging lug sheathed firstly is fixed with the delivery system, and is more reliable and stable, and the second sheathing end 124 can not have any function, for example, is an end point of the outer stent 120. Of course, in other embodiments, the first sheathing end 114 or the second sheathing end 124 may also be a connecting rod having a predetermined function, and the specific structure and function of the first sheathing end 114 and the second sheathing end 124 are not intended to limit the scope of the present invention.

Further, referring to fig. 1, in order to stably fix the valve prosthesis in the delivery sheath and to smoothly release the valve prosthesis, the ventricular end of the stent assembly 100 is provided with a plurality of the sheathing-in end groups 101, the sheathing-in end groups 101 are uniformly arranged along the circumferential direction, and when the length of the first sheathing-in end 114 in each sheathing-in end group 101 is greater than that of the second sheathing-in end 124, each sheathing-in end group 101 is provided with the protruding part 200. Therefore, the sheath can be prevented from entering the interlayer of any one of the sheath-entering end groups 101 in the sheath entering process, and the situation that any one of the second sheath-entering ends 124 is abutted against the end surface of the sheath can be avoided, so that the valve prosthesis can be smoothly sheathed. Of course, in other embodiments, a plurality of the sheathing end groups 101 may be disposed at the atrial end of the stent assembly 100 at the same time, or a plurality of the sheathing end groups 101 may be disposed at both the atrial end and the ventricular end of the stent assembly 100. The arrangement position and the number of the sheathing end groups 101 are selected according to the actual release mode and the structure of the delivery system, and are not described in detail herein.

Referring to fig. 6 and 8, the end face 1141 of the first sheathing end is located at the free end of the first sheathing end 1141, the end face 1241 of the second sheathing end is located at the free end of the second sheathing end 124,

in this embodiment, the protrusion 200 is disposed at the first sheathing end 114, the protrusion 200 has a first end surface 201, the first end surface 201 is located on the side of the end surface 1241 near the second sheathing end, and the width D1 of the first end surface 201 is not less than the width D2 of the second sheathing end 124.

The width D1 of the first end surface 201 may be equal to the width D2 of the second sheathing end 124, as shown in fig. 6 and 7. In some embodiments, the width D1 of the first end surface may also be greater than the width D2 of the second unsheathing end 124, as shown in fig. 8 and 10. When the first sheathing end 114 and the second sheathing end 124 have gradient difference and are pressed into the sheaths, the sheath tube can easily enter the gap between the first sheathing end 114 and the second sheathing end 124, and the bulge part 200 which is arranged at the first sheathing end 114 and extends outwards can reduce the risk that the sheath tube enters the gap between the first sheathing end 114 and the second sheathing end 124.

In this embodiment, referring to fig. 6 and 8, the protruding portion 200 further has a second end surface 202, the second end surface 202 is located on a side away from the first end surface 201, wherein the second end surface 202 of the protruding portion 200 is flush with the end surface 1141 of the first sheathing end. The structure of the protrusion 200 eliminates the gradient difference between the two sheathing ends, as shown in fig. 7, when sheathing, the end surface of the second sheathing end 124 does not touch the end surface of the sheath, so that the interference of the end surface of the second sheathing end 124 to the end surface of the sheath can be effectively avoided, the loading resistance is reduced, and the sheath is not damaged by the second sheathing end 124. Of course, in other embodiments, the protrusion 200 may also extend toward the ventricular end to beyond the end surface 1141 of the first sheathing end, which also solves the problem of interference of the second sheathing end 124 with the sheath 410 during sheathing, and is not limited herein.

Further, in the present embodiment, the first end face 201 of the protruding portion 200 abuts against the end face 1241 of the second sheath end. Due to the propping action of the protrusion 200, the sheath 410 will not enter the stent jacket from the second sheathing end 124 during sheathing.

With continued reference to fig. 4, 6, and 7, in the present embodiment, the first end face 201 of the protrusion 200 matches the end face 1241 of the second sheath end. The matching refers to the consistent size, and the two end faces are in concave-convex matching, so that when the first sheathing end 114 and the second sheathing end 124 are abutted against each other, each sheathing end group 101 is taken as a whole, the risk that the sheath tube 410 enters the interlayer is reduced, and the loading and releasing processes of the valve prosthesis are smoother.

In this embodiment, the protrusion 200 is integrally formed at the first sheathing end 114, which has the advantages of simple, stable and reliable forming process. Of course, in other alternative embodiments, the projection 200 may be separately molded and then secured to the first unsheathed end 114; alternatively, the projection 200 can be movably coupled to the first sheath-entering end 114, such as by a rotatable connection. Alternatively, the protrusion 200 may be removable, and the cap is disposed on the free end of the sheath-end group 101, in which case the protrusion 200 is made of degradable material, such as polylactic acid.

In this embodiment, the protrusion 200 may also have a certain function, such as being used as a hanging ear or a fixing ear.

Example 2

The present embodiment provides a valve stent, which is an improvement on embodiment 1, wherein the outer contour of the protrusion 200 is a circular arc.

As shown in fig. 9, since the first end face 201 of the protrusion 200 abuts against the end face 1241 of the second sheathing end, the circular arc-shaped outer contour can reduce the friction force between the sheath end face and the inner wall of the sheath, thereby further reducing the loading resistance.

Example 3

The present embodiment provides a valve stent, which is an improvement on embodiment 1 or embodiment 2, wherein an axial contact surface between the first sheathing end 114 and the second sheathing end 124 is configured to be in a male-female matching connection.

Referring to fig. 10, a plurality of second protrusions are protruded outwards from the shaft side of the second sheathing end 124, and a second concave portion is formed between two adjacent second protrusions; correspondingly, a plurality of first recesses are formed on the shaft side of the first sheathing end 114, and a first protrusion is formed between two adjacent first recesses 116. After the inner bracket 110 and the outer bracket 120 are connected, the first protrusions are respectively located in one corresponding second recess, and the second protrusions are respectively located in one corresponding first recess, so that the first sheathing end 114 and the second sheathing end 124 are in concave-convex matching connection. Wherein, protruding and concave part be accordant connection one by one, and the quantity of protruding, concave part, set up the position and can select according to the actual connection demand, and not be used for the restriction the utility model discloses a protection scope, here is no longer repeated.

The concave-convex matching connection between the first sheathing end 114 and the second sheathing end 124 enables each sheathing end group 101 to complete the presetting, can replace the connection mode such as welding and the like, and has the advantages of stable connection and easy implementation.

The above disclosure is only illustrative of the preferred embodiments of the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (11)

1. A valve stent is characterized by comprising a stent component, wherein the stent component comprises at least two stents, an inner stent and an outer stent, the inner stent and the outer stent are in an inner-outer nested structure, the inner stent is sleeved inside, and the stent component is constructed to have at least one sheath-entering end group;

the sheathing end group comprises a first sheathing end and a second sheathing end, the first sheathing end is positioned on the inner-layer bracket, the second sheathing end is positioned on the outer-layer bracket, the first sheathing end and the second sheathing end extend towards the same direction, and the second sheathing end is positioned outside the first sheathing end;

when the length of the first sheathing end is larger than that of the second sheathing end in at least one sheathing end group, the sheathing end groups are provided with bulges for preventing the sheathing end groups from interfering with the loading of the valve prosthesis.

2. The valve stent of claim 1, wherein the stent assembly comprises a plurality of the sheathing end groups, each of the sheathing end groups being located at an atrial end or a ventricular end; in each of the sheathing end groups, when the length of the first sheathing end is longer than that of the second sheathing end, the protrusion is disposed in each of the sheathing end groups.

3. The valve stent of claim 2, wherein the protrusion is disposed at the first in-sheath end, the protrusion having a first end surface located on a side of the end surface near the second in-sheath end, and a width of the first end surface is not smaller than a width of the second in-sheath end.

4. The valve stent of claim 3, wherein the projections further have a second end surface on a side facing away from the first end surface, the second end surface being flush with an end surface of the first sheathing end.

5. The valve holder of claim 3, wherein the first end surface of the tab abuts an end surface of the second unsheathed end.

6. The valve stent of claim 5, wherein the first end surface matches the shape of the end surface of the second unsheathed end.

7. The valve holder according to any one of claims 1-6, wherein the outer contour of the protrusion is a circular arc.

8. The valve stent of any one of claims 3-6, wherein the projections are integrally formed with the first in-sheath end.

9. The valve stent of claim 1, wherein the axial interface of the first in-sheath end and the second in-sheath end is configured for a male-female mating connection.

10. The valve stent of claim 1, wherein the first in-sheath end is a tab coupled to a delivery system.

11. A prosthetic heart valve comprising a valve stent according to any of claims 1-10.

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