CN217853486U - Self-expanding heart valve repair stent - Google Patents

Abstract

The utility model discloses a support is restoreed to self-expanding heart valve, compress into self-expanding fretwork support and valve support in the pipe together including the art, can follow the pipe in the art from self-expanding fretwork support and valve support and stretch out and expand voluntarily, self-expanding fretwork support expansion expand back and left atrium inner wall self-adaptation laminating support tightly, valve support expansion back connect in self-expanding fretwork support's below and stretch into between anterior leaflet and the rear side leaflet of mitral valve, be connected with the diaphragm on the valve support, during the cardiac contraction, the leading flank and the trailing flank of diaphragm correspond with anterior leaflet and rear side leaflet She Tiege. The self-expansion hollowed-out support has the advantages that after the self-expansion hollowed-out support is in self-adaptive fit and abutting fit with the inner wall of the left atrium, the position of the support can be ensured to be relatively stable, and the valve support and the membrane extending into the space between the front valve leaflet and the rear valve leaflet can better play a role in seam plugging and repairing; the upper end and the lower end of the membrane are closed, and no narrow passage is formed by blood flow, so that the risk of thrombosis is reduced.

Description

Self-expanding heart valve repair stent

Technical Field

The utility model belongs to the field of medical equipment, concretely relates to self-expanding heart valve repair support.

Background

Severe mitral regurgitation can produce symptoms such as palpitation, chest tightness, shortness of breath and the like, and finally leads to heart failure and death. Surgical valve repair or replacement is considered the standard treatment for this disease. However, surgery has the disadvantages of large trauma, high risk, slow recovery, etc. Therefore, the development of a minimally invasive and low-risk mitral regurgitation interventional therapy device has great social benefits and market demands.

The mitral regurgitation interventional therapy apparatus has become one of the key directions for the development of cardiovascular apparatuses at home and abroad. The existing valve repair stent has the following problems after being placed at the mitral valve: when the heart contracts and relaxes, the support moves up and down in a large amplitude and is easy to deviate from the original position (in severe cases, the support can completely enter an atrium or a ventricle), so that the valve repair effect after the support is placed and used for a period of time is obviously reduced or disappears; in addition, the existing valve repair stent is only suitable for secondary mitral regurgitation caused by mitral valve annulus dilation, also called functional mitral regurgitation, and has poor effect on organic mitral regurgitation caused by damage of annulus, leaflets or chordae, also called primary mitral regurgitation. It would therefore be desirable to provide a product that overcomes the above problems and accommodates all types of mitral regurgitation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a self-expanding heart valve repair stent, which aims to overcome the defects existing in the prior art.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a self-expansion heart valve repair support comprises a self-expansion hollowed support and a valve support, wherein the self-expansion hollowed support and the valve support can be compressed together and installed in a catheter before operation, the self-expansion hollowed support and the valve support can extend out of the catheter and expand and unfold spontaneously during operation, the self-expansion hollowed support is attached to and abutted against the inner wall of the left atrium in a self-adaptive mode after expansion and unfolding, the valve support is connected to the position below the self-expansion hollowed support and extends into the position between a front side valve leaflet and a rear side valve leaflet of a mitral valve after unfolding, a membrane is connected to the valve support, the front side surface and the rear side surface of the membrane correspond to the front side valve leaflet and the rear side valve leaflet She Tiege during heart contraction, and the front side valve leaflet and the rear side valve leaflet are far away from the membrane during diastole.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the self-expanding hollow support is in a spherical shape with polygonal meshes formed by weaving memory alloy wires.

The beneficial effect who adopts above-mentioned further scheme is that, the whole spherical that is the fretwork of self-expansion fretwork support of taking multilateral mesh hole, but self-adaptation compresses and expands along spherical structure's radial and longitudinal direction, can realize installing before the operation in the pipe, release in the left atrium position of heart in the operation, spherical structure can carry out self-expanding and have better laminating effect with the left atrium wall after releasing completely, realize the anchoring effect of heart valve support with this, prevent that the support from removing or coming off along with the heart motion.

Further, valve support include V-arrangement support section and connect in first sleeve pipe and second sleeve pipe at both ends about V-arrangement support section upper portion, the left side, right side and the bottom of diaphragm in proper order with the pointed end in the lower part of first sleeve pipe wall, second sleeve pipe wall and V-arrangement support section is connected, first sleeve pipe and second sheathed tube upper end respectively through the buffering linkage segment with from inflation fretwork support bottom is connected, the buffering linkage segment is by two memory alloy wire sections from corresponding first sleeve pipe or second sleeve pipe upper end begin respectively to form after being close to alternately the ring after front side top and the rear side top extend, first sleeve pipe upper end with second sleeve pipe upper end still supports section interconnect through the arc.

The adoption of the further scheme has the beneficial effects that the V-shaped supporting section, the first sleeve and the second sleeve can well fix the membrane together; the support connecting section can ensure that the support has good elasticity during the diastole and the contraction of the left ventricle through an ingenious curve structure of the support connecting section, so that the support can be stably and not displaced when the valve annulus of the left atrium moves along with the heart, and plays a role in buffering force.

Furthermore, the upper ends of the two memory alloy wire sections of the buffer connecting section are close to each other, are crossed to form a ring and then are connected with the bottom of the self-expansion hollowed-out support.

The valve support and the upper weaving spherical structure are integrally designed, and the risk that the welding points and the structure are separated is avoided.

Further, the first sleeve and the second sleeve are both multi-core tubes, each multi-core tube is provided with a plurality of fixing channels which are arranged along the axial direction in a penetrating mode, and the nickel-titanium alloy wire sections connected with the first sleeve and the second sleeve penetrate through the fixing channels and are clamped by the fixing channels.

The beneficial effect of adopting above-mentioned further scheme is that, through a plurality of fixed passageways in the multicore pipe supply nickel titanium alloy silk (memory alloy silk) to pass through and then press from both sides its lateral wall and warp fixedly, the fixed effect is better, avoids when inserting many memory alloy silks simultaneously in the same great passageway and presss from both sides when fixing the back use each memory alloy silk probably produces relative movement and leads to the problem that support stability worsens in great passageway.

Further, the diaphragm is composed of a front diaphragm and a rear diaphragm which are identical in shape, the left side and the right side of the front diaphragm and the right side of the rear diaphragm are respectively sewn and fixed with the first sleeve and the second sleeve, and the top as well as the bottom and the bottom of the front diaphragm and the rear diaphragm are respectively sewn and sealed with each other.

Adopt above-mentioned further scheme's beneficial effect be, top and bottom all seal the back, do not leave narrow passageway, and blood can not flow through this passageway, can effectively reduce the thrombus risk, and the diaphragm is a whole simultaneously, and native front and back leaflet clamp of mitral valve that can be better is closed.

Furthermore, the V-shaped supporting section, the buffering connecting section and the self-expansion hollowed-out support are composed of the same memory alloy wire.

The beneficial effects of adopting above-mentioned further scheme are that, fixed modes such as solder joint and bonding are avoided in integrative design, and the risk that the structure divides to take off is little, and the performance of support is better.

Furthermore, the cross section of the memory alloy wire is circular or elliptical, and the spherical outer surface formed by weaving the memory alloy wire is smooth and has no edges and corners.

The beneficial effect who adopts above-mentioned further scheme is that, the arc surface outer wall is favorable to the smooth no edges and corners of spherical surface that corresponds after self-expanding fretwork support expandes to effectively alleviate and avoid its wearing and tearing to left atrium wall.

Compared with the prior art, the utility model discloses a technological effect and advantage do:

the utility model provides a support has from inflation fretwork support and connects in the valve support of its bottom, it supports tightly with left atrium inner wall self-adaptation laminating after the expansion of self-inflation fretwork support, then stretch into between the valve leaflet around the mitral valve after the valve support expansion, play the positioning action to whole support after supporting tightly from inflation fretwork support and left atrium inner wall laminating, when the cardiac contraction diastole, can contract thereupon and moderate degree kick-back from inflation fretwork support, thereby guarantee the position relatively stable of support, make stretch into the better caulking repair effect of playing of valve support and diaphragm between the valve leaflet around. The membrane on the valve support is preferably in a structural form that the upper end and the lower end of the membrane are sealed and closed without penetrating through the narrow channel up and down, so that the membrane can be better clamped by the front and back native valve leaflets, and the problem of increasing the risk of thrombus caused by the narrow channel can be avoided.

Drawings

Fig. 1 is an isometric view of a self-expanding heart valve repair stent provided by the present invention;

FIG. 2 is a front view of the self-expanding heart valve repair stent of FIG. 1;

FIG. 3 is a left side view of the self-expanding heart valve repair stent of FIG. 1;

FIG. 4 is a bottom view of the self-expanding heart valve repair stent of FIG. 1;

FIG. 5 is an isometric view of a valve stent of the lower portion of the self-expanding heart valve repair stent of FIG. 1;

FIG. 6 is a bottom view of the valve stent of FIG. 5;

fig. 7 is a schematic view of the heart in a relaxed state after the self-expandable heart valve repair stent provided by the present invention is implanted in the heart;

fig. 8 is a schematic view of the heart in a compressed state after the self-expandable heart valve repair stent provided by the present invention is implanted in the heart.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a self-expanding hollowed-out stent; 2. a valve stent; 3. a membrane; 4. a V-shaped support section; 5. a first sleeve; 6. a second sleeve; 7. a buffer connection section; 8. an arc support section.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, if terms indicating orientation such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does 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.

As shown in fig. 1 to 8, the utility model provides a self-expanding heart valve repair support, which comprises a self-expanding hollow support 1 and a valve support 2 which can be compressed together into a catheter before operation, wherein the self-expanding hollow support 1 and the valve support 2 can extend out of the catheter and expand and unfold spontaneously during operation, the self-expanding hollow support 1 is adaptive to fit and abut against the inner wall of the left atrium after expanding and unfolding, the valve support 2 is connected below the self-expanding hollow support 1 after being unfolded and extends into the space between the front valve leaflet and the back valve leaflet of the mitral valve, the valve support 2 is connected with a membrane 3, when the heart contracts, the front side surface and the back side surface of the membrane 3 correspond to the front valve leaflet and the back valve leaflet She Tiege, and when the heart relaxes, the front valve leaflet and the back valve leaflet are far away from the membrane 3.

The membrane is an artificial valve, is made of a high polymer material, has the characteristics of biocompatibility, flexible material and smooth and non-sharp surface, has the same shape with the native valve leaflet, can have good adaptability with the native valve leaflet of the heart, can effectively seal the gap between the anterior valve leaflet and the posterior valve leaflet of the mitral valve in the contraction period of the left ventricle after the stent is installed, and achieves the purpose of preventing regurgitation.

In one embodiment of the present invention, the self-expandable hollow stent 1 is a ball shape with polygonal meshes formed by weaving memory alloy wires. The self-expanding hollow bracket is of a woven spherical structure.

The spherical structure is knitted by a special knitting process through a special memory metal alloy wire, and the spherical structure is shaped into a spherical structure by a heat setting process after knitting is finished, so that the spherical structure has good form stability after forming; the interior of the braided spherical structure is of a hollow structure, square, parallelogram and quadrilateral-like meshes are uniformly distributed on the surface of the structure, and the meshes are designed so that blood can flow from the meshes without resistance when flowing from the left atrium to the left ventricle, thereby reducing the risk of patients caused by maladaptive symptoms; the cross section of the memory metal alloy wire is circular, elliptical or similar to a circular section, and the surface of a spherical structure formed by weaving is smooth and has no edges and corners; after the self-expanding heart valve stent is placed in the left atrium, the braided spherical structure expands due to the self-expanding effect until the atrium wall slightly expands, so that the anchoring and supporting effect is achieved.

In an embodiment of the present invention, the valve stent 2 includes the V-shaped support section 4 and connects in the first sleeve 5 and the second sleeve 6 at both ends about the upper portion of the V-shaped support section 4, the left side, the right side and the bottom of the diaphragm 3 in proper order with the lower tip of the first sleeve 5 pipe wall, the second sleeve 6 pipe wall and the V-shaped support section 4 is connected, the upper end of the first sleeve 5 and the second sleeve 6 respectively through the buffer connecting section 7 with connect from 1 bottom of the expandable hollow-out stent, the buffer connecting section 7 is corresponding by two memory alloy wire sections the first sleeve 5 or the second sleeve 6 upper end is formed after extending to the front side top and the rear side top respectively and being close to each other after the ring is formed, the first sleeve 5 upper end with the second sleeve 6 upper end is still connected through the arc support section 8.

The first and second sleeves are made of a developing connecting tube having a developing effect under X-rays, and are fixed to the membrane by sewing, and the developing effect under X-rays acts on a placement reference of the position of the prosthetic valve of the stent relative to the mitral valve during the operation. The arc supports the ability that the section on the one hand can strengthen resisting the support and warp when receiving left right direction extrusion, and on the other hand as shown in fig. 5, the arc supports the section and can establishes two, and it can be connected with front and back diaphragm through extending the engaging lug respectively, guarantees that the diaphragm is better with valve support's connected effect, and the diaphragm is more level and more smooth when using, promotes the stifled seam and prevents the anti-refluence effect. The artificial valve has certain thickness, and when the valve of a patient is not closed tightly, the thickness of the artificial valve can effectively compensate the clearance for regurgitation, so that the mitral valve is effectively closed, and the purposes of reducing regurgitation and preventing regurgitation are achieved.

In one embodiment of the present invention, the upper ends of the two memory alloy wire sections of the buffer connecting section 7 are close to each other and cross to form a ring, and then are connected with the bottom of the self-expanding hollow support 1.

In an embodiment of the present invention, the first sleeve 5 and the second sleeve 6 are multi-core tubes, the multi-core tubes have a plurality of fixing channels axially arranged and penetrating therethrough, and the nitinol section connected to the first sleeve 5 and the second sleeve 6 passes through the fixing channels and is clamped by the fixing channels.

In an embodiment of the present invention, the membrane 3 is composed of a front membrane and a rear membrane which have the same shape, the left and right sides of the front membrane and the rear membrane are respectively fixed to the first sleeve 5 and the second sleeve 6, and the top, the bottom and the bottom of the front membrane and the rear membrane are respectively sealed by sewing.

In one embodiment of the present invention, the V-shaped supporting section 4, the buffer connecting section 7 and the self-expandable hollow-out support 1 are made of the same memory alloy wire.

In an embodiment of the present invention, the cross section of the memory alloy wire is circular or elliptical, and the spherical outer surface formed by weaving the memory alloy wire is smooth and has no edge angle.

It should be noted that the self-expandable heart valve stent is installed in the most anterior catheter in the sheath of the adjustable bending conveyor, the installation direction is the direction of the artificial valve installed at the head end of the sheath of the conveyor, and the operation steps are as follows:

delivering a sheath tube provided with a self-expanding heart stent into the left atrium through the interatrial septum;

and II, determining the release direction of the stent according to the development position of the development connector under X-ray, slowly releasing the artificial valve of the catheter at the most front end of the adjustable bending conveyor in the middle of a space connecting line of a front valve leaflet and a rear valve leaflet of the mitral valve in the left atrium, releasing the braided spherical structure at the rear end after the artificial valve is completely released, and self-expanding and anchoring the braided spherical structure in the left atrium to achieve the purpose that the conveyor conveys the stent through minimally invasive surgery.

After the heart valve support provided by the utility model is put into, the mitral valve is opened in the diastole of the left ventricle (figure 7), the atrium blood can be smoothly through getting into the left ventricle through weaving the spherical structure, and the whole heart valve support makes because the anchoring effect of atrium position bearing structure the heart valve support can not drop to the left ventricle. In the ventricular systole, the mitral valve is closed, and the blood regurgitation from the ventricle to the atrium is blocked due to the existence of the artificial valve, so that the condition of mitral valve central regurgitation can be effectively treated.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims (8)

1. A self-expansion heart valve repair support comprises a self-expansion hollowed support (1) and a valve support (2) which can be compressed together and installed in a catheter before operation, and is characterized in that the self-expansion hollowed support (1) and the valve support (2) can extend out of the catheter and expand and unfold spontaneously during operation, the self-expansion hollowed support (1) is adaptive to fit and abut against the inner wall of the left atrium after expansion and unfolding, the valve support (2) is connected below the self-expansion hollowed support (1) after unfolding and extends into a position between an anterior leaflet and a posterior leaflet of a mitral valve, a membrane (3) is connected onto the valve support (2), when the heart contracts, the anterior side and the posterior side of the membrane (3) correspond to the anterior leaflet and the posterior leaflet She Tiege, and when the heart relaxes, the anterior leaflet and the posterior leaflet are far away from the membrane (3).

2. The self-expanding heart valve repair stent according to claim 1, wherein the self-expanding hollow stent (1) is a sphere with polygonal mesh openings formed by weaving memory alloy wires.

3. The self-expanding heart valve repair stent of claim 2, wherein the valve stent (2) comprises a V-shaped support section (4) and a first sleeve (5) and a second sleeve (6) connected to the left end and the right end of the upper portion of the V-shaped support section (4), the left side, the right side and the bottom of the membrane (3) are sequentially connected with the tube wall of the first sleeve (5), the tube wall of the second sleeve (6) and the tip of the lower portion of the V-shaped support section (4), the upper ends of the first sleeve (5) and the second sleeve (6) are respectively connected with the bottom of the self-expanding hollowed-out stent (1) through a buffer connecting section (7), the buffer connecting section (7) is formed by two memory alloy wire sections which respectively extend from the upper end of the first sleeve (5) or the upper end of the second sleeve (6) to the upper side and then are mutually close to each other to form a ring after extending to the upper end of the front side and the upper end of the rear side, and the upper ends of the first sleeve (5) and the second sleeve (6) are also connected with each other through an arc-shaped support section (8).

4. The self-expanding heart valve repair stent according to claim 3, wherein the upper ends of the two memory alloy wire sections of the buffer connecting section (7) are close to each other and are crossed to form a ring and then are connected with the bottom of the self-expanding hollow stent (1).

5. A self-expanding cardiac valve repair stent according to claim 3, wherein the first sleeve (5) and the second sleeve (6) are each a multi-core tube having a plurality of fixing channels disposed axially and therethrough, and wherein two memory alloy wire segments connected to the first sleeve (5) and the second sleeve (6) pass through and are secured by the fixing channels.

6. A self-expandable heart valve repair stent according to claim 3, wherein the membrane (3) is composed of an anterior membrane and a posterior membrane which have the same shape, the left and right sides of the anterior membrane and the posterior membrane are respectively fixed with the first sleeve (5) and the second sleeve (6) by sewing, and the top of the anterior membrane and the bottom of the posterior membrane are respectively closed by sewing.

7. The self-expandable heart valve repair stent according to any one of claims 3 to 6, wherein the V-shaped supporting section (4), the buffer connecting section (7) and the self-expandable hollow stent (1) are made of the same memory alloy wire.

8. The self-expanding cardiac valve repair stent of claim 7, wherein the cross-section of the memory alloy wire is circular or elliptical, and the spherical outer surface of the memory alloy wire formed by weaving is smooth and has no corners.

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