CN219680864U - Counter-flow support for single-layer conveying - Google Patents

Abstract

The utility model belongs to the technical field of medical appliances, and particularly relates to a single-layer conveying reverse flow support. The utility model provides a palirrhea support that individual layer was carried, includes support main part and setting element, and the setting element is connected in the outflow end of support main part, and the tie point between setting element and the support main part is one, causes setting element and support main part to form single-point connection structure. After the support main body is compressed, the positioning piece can be easily bent towards the outflow end to form a single-layer structure, and the positioning piece can be easily turned over when released.

Description

Counter-flow support for single-layer conveying

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to a single-layer conveying reverse flow support.

Background

The aortic valve is located between the left ventricle and the aorta and has the main function of inhibiting the backflow of blood into the main artery into the left ventricle, which can be caused by the occurrence of an aortic valve insufficiency. Aortic valve regurgitation can burden the left ventricle, and severe regurgitation can also cause heart failure, ultimately leading to sudden death.

Traditional aortic valve replacement adopts the mode of surgery, and the patient needs to open chest to establish the extracorporeal circulation, so not only the expense is high, but also the operation risk is big, and patient's postoperative recovery time is longer simultaneously.

In recent years, along with the continuous improvement of medical level, the development of the TAVI technology is rapidly advanced, and the TAVI technology is also popular and is developed day by day because the TAVI technology is applied to the heart catheter minimally invasive technology as a third mode after the surgical aortic valve replacement technology and the drug treatment, has the characteristics of less wound, short operation time, quick recovery of patients and the like, and does not need to open the chest.

Conventional reverse flow stents (e.g., for aortic valve replacement) are delivered through a catheter with a positioning member overlapping the stent body, resulting in limited compression of the reverse flow stent size, which results in an oversized diameter of the catheter and thus is not patient friendly, as an oversized catheter can dilate the vessel and is not flexible enough to be operated.

Therefore, a single-layer conveying reverse flow stent is proposed, wherein a positioning piece and a stent main body cannot be overlapped in the conveying process, and single-layer conveying of the reverse flow stent can be realized.

Disclosure of Invention

The utility model aims at solving the technical problem that the diameter of a catheter is overlarge because a positioning piece is overlapped with a stent main body when the traditional reverse flow stent is conveyed through the catheter, and aims to provide a single-layer conveying reverse flow stent.

In order to solve the foregoing technical problems, an aspect of the present utility model provides a single-layer conveying reverse flow stent, which includes a stent body and a positioning member, wherein the positioning member is connected to an outflow end of the stent body, and a connection point between the positioning member and the stent body is one, so that the positioning member and the stent body form a single-point connection structure.

Alternatively, in the single layer delivery reverse flow stent as described above, the positioning member is in the form of a drop, preferably a hollow drop.

Alternatively, in the single-layer delivery reverse flow stent as described above, the narrower end of the positioning member is single-point connected to the stent body.

Alternatively, in a single layer delivery reverse flow stent as described above, the positioning member is oval, preferably hollow oval.

Alternatively, in the single-layer delivery reverse flow stent as described above, the positioning member is located at one end of the long axis and is single-point connected to the stent body.

Alternatively, in the single-layer delivery reverse flow stent as described above, the positioning member and the stent body are integrally connected by a positioning reinforcement member.

Optionally, in the single-layer delivery reverse flow stent, the stent body is formed by a plurality of layers of net structures, and the grid outflow end part positioned at the outflow end side of the stent body is connected with the positioning piece in a single point.

Optionally, in the single layer delivery reverse flow stent as described above, the single layer delivery reverse flow stent further comprises:

the connecting blocks are arranged at the outflow end of the support body or the inflow end of the support body and are connected with the conveying device.

Optionally, the coupling block is inclined to the inside of the holder body.

Optionally, in the single layer delivery reverse flow stent as described above, the coupling block is provided with coupling holes.

Optionally, in the single-layer conveying reverse flow stent as described above, the positioning members are plural, and the plural positioning members and the plural coupling blocks are disposed at intervals at the outflow end of the stent body.

The utility model has the positive progress effects that:

1. the locating piece is connected in the outflow end of support main part and adopts single-point connection structure, and support main part can be easily with the locating piece to outflow end direction buckling after the compression to be the individual layer structure when making the backward flow support compressive state. This is because the single point connection of the positioning members makes the connection points of the positioning members not deformed by compression after the stent body is compressed. In the case of two or more connection points, the distance between the connection points changes during the compression of the stent body to generate internal stress, which makes the connection points of the positioning member difficult to turn under force. Therefore, the positioning piece can be turned over easily after the single-point connection design. The positioning piece is connected with the main body of the support in a single point mode, so that the main body of the support can slightly deflect relative to the positioning piece, the main body of the support has certain self-adaptability after the positioning piece is inserted into the aortic sinus, for example, the main body of the support slightly deflects, and the main body of the support is more fit with an aortic valve (ring), so that a better perivalvular sealing effect can be achieved.

2. The positioning piece is favorable for compression when adopting a water drop shape. The locating piece is not only favorable to the locating piece compression when adopting oval, and its middle part radial dimension is bigger than the water droplet, do benefit to its firm in inserting the aortic sinus, the locating piece is propped full whole aortic sinus relatively promptly, prevent that its backward flow main part from taking place along the rotatory condition of axis from taking place, oval locating piece is round and full relatively, reduced the atress at aortic sinus bottom, and oval locating piece has elasticity in axial direction, the impact force of locating piece free end to aortic sinus bottom when can buffering artifical valve leaf to close, the injury of locating piece to aortic sinus has been reduced.

3. The positioning piece is integrally connected with the support body through the positioning reinforcing piece, when the positioning piece bends towards the outflow end direction, the reaction is applied to the positioning reinforcing piece instead of the positioning piece, and when the positioning piece is released to overturn, the overturning axis is also positioned at the positioning reinforcing piece, so that the positioning piece can be well protected.

4. The coupling block is adapted to be coupled to a delivery device for delivering and releasing the reverse flow stent of the present utility model.

Drawings

The present disclosure will become more apparent with reference to the accompanying drawings. It is to be understood that these drawings are solely for purposes of illustration and are not intended as a definition of the limits of the utility model. In the figure:

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a perspective view of the compressed state of FIG. 1;

FIG. 4 is a front view of FIG. 1;

FIG. 5 is an expanded schematic view of FIG. 1;

FIG. 6 is a schematic view of FIG. 1 within a catheter;

FIG. 7 is a schematic diagram showing the development of a structure according to another embodiment of the present utility model.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which is to be read in light of the specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model.

It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

In the description of the present utility model, it should be noted that, for the azimuth terms, such as terms "outside," "middle," "inside," "outside," and the like, the azimuth and positional relationships are indicated based on the azimuth or positional relationships shown in the drawings, only for convenience in describing the present utility model and simplifying the description, but not to indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and should not be construed as limiting the specific protection scope of the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first", "a second" feature may explicitly or implicitly include one or more of such feature, and in the description of the present utility model, the meaning of "a number", "a number" is two or more, unless otherwise specifically defined.

In the description of the present utility model, it should be noted that, in addition to the specific description shown in the figures, the height direction is substantially along the axis of the reverse flow stent, and references herein to "high", "upper" and "lower" refer to the position of the outflow end of the reverse flow stent when in the expanded state (as shown in fig. 2), and "low", "lower" refer to the position of the inflow end of the reverse flow stent when in the expanded state, and "inflow end" refers to the position upstream in terms of the direction of blood flow, i.e., the position where the stent first passes through the end of blood when in the expanded state, such as inflow end 100 shown in fig. 2; the "outflow end" refers to the end of the stent that is positioned downstream in terms of the direction of blood flow, i.e., when blood leaves the expanded state, such as outflow end 200 shown in fig. 2.

Referring to fig. 1 to 7, the present utility model provides a single-layer conveying reverse flow stent, which comprises a stent body 1 and a positioning member 2, wherein the positioning member 2 is connected to the outflow end of the stent body 1, and the connection point a between the positioning member 2 and the stent body 1 is one, so that the positioning member 2 and the stent body 1 form a single-point connection structure.

In the reverse flow stent expansion state, as shown in fig. 1 and 2, the positioning member 2 expands outward from the outflow end of the stent body 1 toward the inflow end side, the outflow end of the positioning member 2 is a connection end, the inflow end of the positioning member 2 is a free end, and the positioning member 2 provides a good supporting force for the stent body 1. In the compressed state of the stent, the positioning member 2 is bent to the outflow end side of the stent body 1 as shown in fig. 3 to 4, and the compressed stent is delivered to the target position through the catheter 5 of the delivery device as shown in fig. 6.

The connecting relation between the positioning piece 2 and the support main body 1 adopts a single-point connecting structure, the positioning piece 2 is more flexible relative to the support main body 1, and 1) the support main body 1 can easily bend the positioning piece 2 towards the outflow end after compression, because the single-point connection of the positioning piece 2 ensures that the connecting point a of the positioning piece 2 can not be deformed due to compression after the support main body 1 is compressed, if two or more connecting points exist, the distance between the connecting points is changed during the compression process of the support main body, so that internal stress is generated, and the stress overturning difficulty of the connecting point of the positioning piece is caused. Therefore, the positioning piece 2 can be turned over easily; 2) The single point connection of the positioning member 2 and the stent body 1 allows the stent body 1 to slightly deflect relative to the positioning member 2, which makes the stent body 1 have a certain self-adaptability after the positioning member 2 is inserted into the aortic sinus, such as slightly deflecting, and more fitting the aortic valve (annulus), so as to achieve a better perivalve sealing effect.

In some embodiments, referring to fig. 1-6, the positioning member 2 is in the shape of a drop, and the positioning member 2 is preferably in the shape of a hollow drop. Compression is facilitated when the positioning member 2 is in the shape of a water drop.

In some embodiments, when the positioning member 2 is in the shape of a drop, its narrower end is connected to the bracket body 1 at a single point.

In some embodiments, referring to fig. 7, the positioning member 2 takes the shape of an oval, preferably a hollow oval.

In some embodiments, when the positioning member 2 is elliptical, the positioning member 2 is located at either end of the major axis and is connected to the bracket body 1 at a single point. One end of the long axis of the elliptic positioning piece 2 is used as a connecting end to be connected with the bracket main body 1 in a single point, and the other end is used as a free end.

In the reverse flow stent compressed state, the long axis of the positioning member 2 is parallel to the axial direction of the stent body 1. The locating piece 2 is not only favorable to the locating piece compression when adopting oval, and its middle part radial dimension is bigger than the water droplet, do benefit to its firm in inserting the aortic sinus, the locating piece 2 is propped full whole aortic sinus relatively promptly, prevent that its backward flow main part from taking place along the rotatory condition of axis from taking place, oval locating piece 2 is round and full relatively, the atress at the bottom of the aortic sinus has been reduced, and oval locating piece 2 has elasticity in axial direction, the impact force of locating piece 2 free end to the aortic sinus bottom when can buffering artifical valve leaf to close, the injury of locating piece to the aortic sinus has been reduced.

In some embodiments, the positioning member 2 is integrally formed with the holder body 1, for example, by integrally cutting.

In some embodiments, the positioning member 2 is integrally connected with the bracket body 1 through the positioning reinforcement member 3. At this time, the positioning reinforcement 3 is a connection point a between the positioning member 2 and the bracket main body 1.

The positioning reinforcement 3 is used for bending and overturning, when the positioning member 2 is bent towards the outflow end direction, the reaction is applied to the positioning reinforcement 3 instead of the positioning member 2, and when the positioning member 2 is released to overturn, the overturning axis is also positioned at the positioning reinforcement 3, so that the positioning member 2 can be well protected.

In some embodiments, the stent body 1 is formed by a plurality of layers of net structures, and the outlet end of the net positioned at the outlet end side of the stent body 1 is connected with the positioning member 2 in a single point.

In some embodiments, referring to fig. 2, the stent body 1 is formed of a 3-6 layer mesh structure, for example, a 4-layer, 5-layer mesh structure, and the outflow end portion of the mesh on the outflow end side is connected to the positioning member 2 at a single point.

In some embodiments, the number of the positioning pieces 2 is 3, each positioning piece 2 is independently connected with the stand main body 1 in a single point, and the three positioning pieces 2 are uniformly connected with the outflow end of the stand main body 1.

In some embodiments, referring to fig. 1 to 7, the single-layer delivery reverse flow stent further comprises a plurality of coupling blocks 4, wherein the plurality of coupling blocks 4 are uniformly arranged at the outflow end of the stent body 1, and the coupling blocks 4 are used for connecting with a delivery device so as to facilitate the delivery and release of the reverse flow stent of the present utility model.

In some embodiments, the attachment block 4 may be provided at the inflow end of the stent body 1 when a trans-apical delivery is used.

In some embodiments, the joint block 4 is inclined toward the inside of the holder body 1.

In some embodiments, the coupling block 4 is provided with a coupling hole 41.

In some embodiments, the coupling hole 41 is a rectangular through hole.

In some embodiments, the coupling block 4 is integrally formed with the holder body 1, for example, by integrally cutting.

In some embodiments, the coupling block 4 is integrally connected with the bracket body 1 through a positioning reinforcement.

In some embodiments, the positioning members 2 are plural, and the plural positioning members 2 and the plural coupled blocks 4 are disposed at intervals at the outflow end of the stand body 1.

In some embodiments, the number of the positioning members 2 is three, the number of the coupling blocks 4 is three, and the three positioning members 2 and the three coupling blocks 4 are uniformly spaced at the outflow end of the bracket body 1.

The present utility model has been described in detail with reference to the embodiments of the drawings, and those skilled in the art can make various modifications to the utility model based on the above description. Accordingly, certain details of the embodiments are not to be interpreted as limiting the utility model, which is defined by the appended claims.

Claims (10)

1. The utility model provides a reverse flow support that individual layer was carried, includes support main part and setting element, its characterized in that, the setting element connect in the outflow end of support main part, the setting element with tie point between the support main part is one, causes the setting element with the support main part forms single-point connection structure.

2. The single layer delivery reverse flow stent of claim 1, wherein the positioning member is in the form of a drop or a hollow drop.

3. The single layer delivery reverse flow stent of claim 2 wherein the narrower end of the positioning member is single point connected to the stent body.

4. The single layer delivery reverse flow stent of claim 1, wherein the positioning member is oval or hollow oval.

5. The single layer delivery reverse flow stent of claim 4, wherein the positioning member is located at one end of the long axis and is single point connected to the stent body.

6. The single layer delivery reverse flow stent of claim 1, wherein the positioning member is integrally connected to the stent body by a positioning reinforcement member.

7. The single-layer delivery reverse flow stent of claim 1, wherein the stent body is formed of a plurality of layers of mesh structures, and the end of the mesh outflow end on the outflow end side of the stent body is connected to the positioning member at a single point.

8. The single layer delivery reverse flow stent of any one of claims 1 to 7, further comprising:

the connecting blocks are arranged at the outflow end of the support body or the inflow end of the support body and are connected with the conveying device.

9. The single layer delivery reverse flow stent of claim 8, wherein the attachment block is inclined to the inside of the stent body;

and/or the connecting block is provided with a connecting hole.

10. The single layer delivery reverse flow stent of claim 8, wherein a plurality of said positioning members are disposed at the outflow end of said stent body in spaced relation to a plurality of said attachment blocks.