CN105213077B - One kind covers net support - Google Patents

Abstract

The invention relates to the technical field of medical devices, in particular to a mesh-covered stent, including a self-expandable stent and a mesh-cover, and the mesh-cover includes a ring body and a mesh body, wherein the ring body and the proximal center of the self-expandable stent The side is movably connected, and the distal end of the mesh body is fixedly connected with the self-expanding stent; the proximal side of the covered mesh is connected with a mesh cable. The beneficial effect of the present invention is to provide a mesh-covered stent device that can not only be implanted into the arterial blood vessel but also be removed from the arterial blood vessel after a period of time when treating arterial stenosis clinically, reducing even The adverse effect caused by the long-term storage in the body of the existing self-expanding stent is eliminated.

Description

A net-covering bracket

technical field

The invention relates to the technical field of medical devices, in particular to a mesh-covered stent, which can not only be implanted into the arterial blood vessel, but also be taken out from the arterial blood vessel after a period of time for the clinical treatment of arterial stenosis.

Background technique

The self-expanding stent is a currently known device suitable for the treatment of large and medium arterial stenosis. The stent delivery catheter loaded with the self-expandable stent is sent to the arterial stenosis through the peripheral artery, and then the self-expandable stent is pushed out from the stent delivery catheter, and the self-expandable stent expands by itself and supports the arterial lesion.

The main function of the self-expandable stent is to provide support for the pre-expanded arterial wall, keep the blood vessel in an expanded state, and prevent blood vessel collapse and occlusion. Necessary in arterial vessels. However, once the existing self-expanding stent is implanted in the blood vessel, it will permanently stay in the body and cannot be removed. For the human body, the implanted self-expanding stent is always a foreign body, and it will inevitably cause further inevitable damage to the blood vessel if it stays in the blood vessel for a long time: on the one hand, the self-expanding stent itself can be broken and twisted, on the other hand, the self-expanding stent The stent can stimulate the proliferative response of the vessel wall, resulting in accelerated restenosis of the vessel.

Usually, the solution to the restenosis of the blood vessel where the stent is placed is to place another stent inside the original stent, and this method of stent-in-stent will inevitably lead to further restenosis of the arterial blood vessel. Not only that, long-term systemic anticoagulation is required after self-expanding stent implantation to prevent stent thrombosis. However, long-term anticoagulation has a potential risk of massive bleeding. At present, although degradable self-expanding stents have entered clinical trials, they are limited to tubes due to insufficient mechanical support, easy rebound after pressure relief, premature decline in support force during degradation, breakage or block fall-off. Arteries with small lumens (such as coronary arteries) are used. Since the supporting force of the degradable self-expandable stent becomes weaker when its diameter is larger, the prospect of applying it to the treatment of large and medium-sized artery stenosis is very slim.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a vascular stent that can not only be implanted into the arterial blood vessel but also be taken out from the arterial blood vessel after a period of time when treating arterial blood vessel stenosis clinically.

In order to achieve the above object, the present invention provides a mesh-covered stent, comprising a self-expandable stent and a mesh-cover, and the mesh-cover includes a ring body and a mesh body, wherein the ring body and the proximal side of the self-expandable stent Flexible connection, the distal end of the mesh body is fixedly connected with the self-expanding stent;

The proximal side of the covering net is connected with a net cable. A covering net is arranged on the outside of the known self-expanding stent to constitute the main body of the system; the distal end of the covering net and the self-expanding stent form a multi-point fixed connection, and the number of the connection points is ≥ 2. The connection point can be located at any position between the middle section of the self-expandable stent and the distal end; the covering mesh and the proximal side of the self-expandable stent form a multi-point flexible connection, and the number of the connection points is ≥ 2 indivual. When the net cable is used to take out the net-covering support, it is used in conjunction with a removal tool, and there are more than two connection points between the net cable and the net-covering. When the self-expanding stent is in the expanded state and fixed in the vascular lumen, when the mesh cable is pulled by the pulling tool, the covering mesh is stretched in the axial direction and retracted in the radial direction, and at the same time The covering mesh drives the self-expanding stent to elongate in the axial direction and retract in the radial direction. The self-expanding stent is made of, but not limited to, nickel-titanium alloy; the covering mesh and mesh cables are made of, but not limited to, non-metallic materials, which have hydrophilic and super-slip properties.

Preferably, the self-expanding stent is a corrugated self-expanding stent, and the corrugated self-expanding stent includes a plurality of corrugated support rings and bridges, and adjacent corrugated support rings are connected by bridges;

The wave-shaped support ring is provided with a limit hole at its wave crest, and the axially adjacent wave-peak point of the wave-shaped support ring is parallel to the axial centerline of the wave-shaped self-expanding stent;

The mesh body of the covering mesh is composed of a plurality of mesh wires parallel to each other, one end of the mesh wire is fixed on the ring body, the other end of the mesh wire is a distal end, and the distal end of the mesh wire is fixedly connected to the ring body. A limiting hole on the distal side of the wave-type self-expanding stent, the mesh is parallel to the axial centerline of the wave-type self-expanding stent;

The ring body surrounds and passes through the limiting hole at the proximal end of the wave-shaped self-expanding stent. The fixed connection point between the covering mesh and the self-expanding stent can be the proximal end of the bridge, or the distal end of the bridge.

Preferably, the connection relationship between the mesh wire and the wave-type self-expanding stent is: the mesh wire passes through the middle section of the wave-type self-expanding stent along the axial direction of the wave-type self-expanding stent limit hole;

The surface area of the wave-type self-expanding stent covered by the mesh body is 4/5-1 of the surface area of the wave-type self-expanding stent.

Preferably, the self-expanding stent is a corrugated self-expanding stent, and the corrugated self-expanding stent includes a plurality of corrugated support rings and bridges, and adjacent corrugated support rings are connected by bridges;

The wave-shaped support ring is provided with a limit hole at its wave crest, and the axially adjacent wave-peak point of the wave-shaped support ring is parallel to the axial centerline of the wave-shaped self-expanding stent;

The mesh body covered with mesh is a tubular structure composed of mesh mesh units and woven by multiple mesh wires. The diagonal line of each mesh body mesh unit is in line with the self-expanding wave pattern. The axial center line of the self-expanding stent is parallel, one end of the mesh is fixed on the ring body, the other end of the mesh is the distal end, and the distal end of the mesh is fixedly connected to the wave-type self-expanding stent. Limiting hole on the heart side;

The ring body surrounds and passes through the limiting hole at the proximal end of the wave-shaped self-expanding stent.

Preferably, the connection relationship between the mesh and the wave-shaped self-expanding stent is as follows: the mesh passes through the limiting hole on the wave-shaped rod in the middle section of the wave-shaped self-expanding stent;

The surface area of the wave-type self-expanding stent covered by the mesh body is 4/5-1 of the surface area of the wave-type self-expanding stent. The side length of the grid unit of the mesh body is between 0.01-10mm, and the larger grid is correspondingly equipped with a larger diameter bracket.

Preferably, the self-expanding stent is a braided self-expanding stent composed of stent grid units, the diagonal line of each stent grid unit and the axial centerline of the braided self-expanding stent parallel;

The mesh body of the covering mesh is composed of a plurality of mesh wires parallel to each other, one end of the mesh wire is fixed on the ring body, the other end of the mesh wire is a distal end, and the distal end of the mesh wire is fixedly connected to the At the weaving cross point on the distal side of the braided self-expanding stent, the mesh wire is parallel to the axial center line of the braided self-expanding stent.

Preferably, the connection relationship between the mesh and the braided self-expanding stent is as follows: the braided intersection of the braided self-expanding stent is flexibly connected to the stop ring, and the distal end of the mesh is fixedly connected to the On the limit ring on the far-center side of the braided self-expandable stent, the mesh wire passes through the limit ring of the middle section of the braided self-expandable stent along the axial direction of the braided self-expandable stent;

The ring body surrounds and passes through the limiting ring at the proximal end of the braided self-expanding stent;

The surface area of the braided self-expanding stent covered by the mesh body is 1/5-1 of the surface area of the braided self-expanding stent.

Preferably, the self-expanding stent is a braided self-expanding stent composed of stent grid units, the diagonal line of each stent grid unit and the axial centerline of the braided self-expanding stent parallel;

The mesh covered with mesh is a tubular structure composed of mesh mesh units and woven by multiple mesh wires. The diagonal line of each mesh mesh unit is aligned with the braided self-expanding The axial center line of the self-expanding stent is parallel, one end of the mesh is fixed on the ring body, the other end of the mesh is the distal end, and the distal end of the mesh is fixedly connected to the braided self-expanding stent. At the intersection of the braid on the heart side.

Preferably, the connection relationship between the mesh and the braided self-expanding stent is as follows: the braided intersection of the braided self-expanding stent is flexibly connected to the stop ring, and the distal end of the mesh is fixedly connected to the On the limiting ring on the distal side of the braided self-expanding stent, the mesh thread is connected to the limiting ring of the middle section of the braided self-expanding stent;

The ring body surrounds and passes through the limiting ring at the proximal end of the braided self-expanding stent;

The surface area of the braided self-expanding stent covered by the mesh body is 1/5-1 of the surface area of the braided self-expanding stent.

Preferably, the mesh cable is connected to the mesh-covered ring body, and the pulling point of the mesh cable is located on the axial centerline of the self-expanding stent. The pulling point of the mesh cable is located on the axial centerline of the self-expanding stent, so that it has good symmetry, stability and safety during recovery. The mesh cord can protrude from the proximal end of the self-expandable stent in a dome-supporting shape, or can be parallel to the end face of the proximal end of the self-expandable stent, or can be recessed into the self-expandable stent in the form of a reverse fornix. The number of the net cables may be 1, or 2 or more. When the number of net cables is ≥ 2, the midpoints of the net cables are connected together.

Preferably, a developing mark point is provided at the pulling point of the net rope and the ring body;

The pulling point of the net rope is provided with a developing mark point.

Preferably, the diameter of the wires of the mesh body is smaller than the diameter of the wires of the self-expanding stent. The mesh wire diameter of the mesh body is smaller than the stent wire diameter of the self-expandable stent, so the distance between the self-expandable stent and the artery wall will not be significantly increased, and the wall-attachment effect of the self-expandable stent will not be affected.

Preferably, a fusion layer is provided between the mesh body and the self-expanding stent. Before the mesh body is stressed, the mesh body and the self-expanding stent form an integrated structure through the fusion layer. When the mesh body is stressed, the fusion layer breaks.

Preferably, the present invention also provides a mesh-covered stent removal tool for taking out the above-mentioned mesh-covered stent, including a drag hook rod, an inner sheath tube and an outer sheath tube, and the head end of the drag hook rod is bent , the diameter of the drag hook rod gradually decreases from the tail end to the head end;

The head end of the outer sheath expands outwards in a trumpet shape.

The drag hook rod is used in cooperation with the net rope of the above-mentioned net-covering support.

The present invention also provides a mesh-covered stent implantation and removal system, including the above-mentioned mesh-covered stent and a tool for removing the mesh-covered stent, and the mesh-covered stent removal tool includes a hook rod, an inner sheath and an outer sheath , the head end of the drag hook rod is bent, and the diameter of the drag hook rod gradually decreases from the tail end to the head end; the head end of the outer sheath tube expands outwards to form a trumpet shape.

Preferably, the method for using the tool for taking out the net-covering support includes the following steps:

Step a. Send the routinely used dilation tube and guide wire into the outer sheath tube, send the outer sheath tube to the blood vessel segment at the proximal end of the mesh-covered stent through the peripheral artery puncture, and withdraw the dilation tube and guide wire. lead wire;

Step b. Send the retractor rod into the inner sheath tube, send the inner sheath tube to the head end of the outer sheath tube through the outer sheath tube and expose the head end of the outer sheath tube, so that the inner sheath tube reaches the vicinity of the mesh cable , to fix the inner sheath;

Step c. Push out the retractor rod from the inner sheath to hook the pulling point of the mesh cable, and push the inner sheath toward the distal end of the mesh-covered stent until the retractor rod is retracted into the inner sheath. During this process, the net cables and the covering net are elongated and thinned, and the covering net-type support covered by the covering net is also gradually deformed with the tension of the covering net.

Step d. pushing the outer sheath towards the distal end of the mesh-covered stent until the inner sheath is retracted into the outer sheath;

Step e. Continue to push the outer sheath tube towards the distal end of the mesh-covered stent, so that the mesh-covered stent is separated from the arterial wall through the trumpet-shaped head end of the outer sheath until the mesh-covered stent is gradually It is retracted into the outer sheath tube, and the outer sheath tube is withdrawn from the blood vessel to complete the technical scheme of taking out the stent. Wherein, the covering net drives the net covering bracket to deform under the pulling force of the drag hook rod, and the pipe diameter of the net covering bracket gradually becomes thinner and deforms from the proximal end to the distal end.

Furthermore, the method for using the tool for taking out the covering net support also includes the following steps:

After step b is completed, according to the connection point between the net rope and the ring body, a development mark is provided to determine the protruding area where the hook rod protrudes out of the inner sheath;

The bending direction of the head end of the drag hook rod is determined when the drag hook rod extends out of the inner sheath according to the development mark point provided at the connection point between the net cable and the ring body.

The term "proximal" refers to the part of the system that is closer to the aortic valve of the heart by means of the blood flow path, and "distal side" refers to the part of the system that is farther away from the aortic valve of the heart by the blood flow path and "proximal end" refers to an end face of the system that is closer to the aortic valve of the heart by means of a blood flow path, and "far end" refers to an end surface of the system that is farther away from the aortic valve of the heart by means of a blood flow path end face.

The beneficial effect of the present invention is to provide a mesh-covered stent device that can not only be implanted into the arterial blood vessel but also be removed from the arterial blood vessel after a period of time when treating arterial stenosis clinically, reducing even The adverse effect caused by long-term storage in the body of the existing self-expanding stent is eliminated.

Description of drawings

Fig. 1 is the structural representation of the take-out state of the present invention;

Fig. 2 is a kind of structural representation of the present invention among Fig. 1;

Fig. 3 is a schematic structural view of the self-expanding stent in Fig. 1;

Fig. 4 is the structural representation of corrugated bar in Fig. 3;

Fig. 5 is the structural schematic diagram of overlay net in Fig. 1;

Fig. 6 is another schematic structural view of the present invention;

Figure 7 is a schematic structural view of the self-expanding stent in Figure 6;

Fig. 8 is a schematic structural view of the corrugated rod in Fig. 7;

Fig. 9 is a schematic structural view of the covering net in Fig. 6;

Fig. 10 is another structural schematic diagram of the present invention;

Figure 11 is an enlarged schematic view of part A in Figure 10;

Fig. 12 is a schematic structural view of the self-expanding stent in Fig. 10;

Fig. 13 is a schematic structural view of the covering net in Fig. 10;

Fig. 14 is another structural schematic diagram of the present invention;

Fig. 15 is an enlarged schematic diagram of part B in Fig. 14;

Fig. 16 is a schematic structural view of the self-expanding stent in Fig. 14;

Fig. 17 is a schematic structural view of the covering net in Fig. 14;

Fig. 18 is a schematic view of the structure of the extraction tool used to extract the present invention.

in:

1-wave self-expanding stent 11-wave rod 101-limiting hole

12-bridge 2-braided self-expanding stent 201-limiting ring

3-covering net 31-ring body 32-network body

321-Mesh 4-Net Cable 5-Retractor Rod

6-inner sheath 7-outer sheath

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

A mesh-covered stent as shown in Figures 1 to 5, including a self-expandable stent and a mesh-covered 3, the mesh-covered 3 includes a ring body 31 and a mesh body 32, the proximal side of the mesh-covered 3 is connected Web cable 4. A covering mesh 3 is arranged outside the known self-expanding stent to constitute the main body of the system; the distal end of the covering mesh 3 forms a multi-point fixed connection with the self-expanding stent, and its connection point can be located on the self-expanding stent. Any position between the middle section of the expandable stent and the distal end; the cover mesh 3 forms a multi-point flexible connection with the proximal side of the self-expandable stent. The net rope 4 is used in cooperation with the taking-out tool when taking out the net-covering support. When the self-expanding stent is in an expanded state and fixed in the blood vessel lumen, when the mesh cable 4 is pulled by the pulling tool, the covering mesh 3 is stretched in its axial direction and retracted in its radial direction , and at the same time, the covering mesh 3 drives the self-expanding stent to elongate in the axial direction and retract in the radial direction. The self-expanding stent is made of, but not limited to, nickel-titanium alloy; the covering mesh 3 and mesh cable 4 are made of, but not limited to, non-metallic materials, which have hydrophilic and super-slip properties.

The self-expanding stent is a corrugated self-expanding stent 1, which includes a plurality of corrugated support rings and bridges 12, and adjacent corrugated support rings are connected through the bridges 12;

The corrugated support ring is a corrugated annular structure composed of a plurality of corrugated rods 11, the corrugated rods 11 are provided with limiting holes 101 at their crests, and the axially adjacent crest points of the corrugated support ring are on the line parallel to the axial centerline of the wave-type self-expanding stent 1;

The net body 32 of described covering net 3 is made up of a plurality of mesh wires 321 parallel to each other, and one end of this mesh wire 321 is fixed on the ring body 31, and the other end of this mesh wire 321 is the far-center end, and described mesh wire 321 The distal end of the distal end is fixedly connected to the limiting hole 101 on the wave-shaped rod 11 on the far-center side, and the mesh 321 is parallel to the axial centerline of the wave-shaped self-expanding stent 1;

The ring body 31 surrounds and passes through the limiting hole 101 on the corrugated rod 11 at the proximal end. The fixed connection point between the covering mesh 3 and the self-expanding stent may be the proximal end of the bridge 12;

The connection relationship between the mesh 321 and the wave-shaped self-expanding stent 1 is: the mesh 321 passes through the middle of the wave-shaped self-expanding stent 1 along the axial direction of the wave-shaped self-expanding stent 1 The limiting hole 101 on the corrugated rod 11 of the section;

The surface area of the corrugated self-expanding stent 1 covered by the mesh body 32 is 4/5 of the surface area of the corrugated self-expanding stent 1 . The side length of the grid unit of the mesh body is between 0.01-10mm, and the larger grid is correspondingly equipped with a larger diameter bracket.

The mesh cable 4 is connected to the ring body 31 of the covering mesh 3, and the pulling point of the mesh cable 4 is located on the axial centerline of the self-expanding stent.

The connection point between the net cable 4 and the ring body 31 is provided with a developing mark point;

The pulling point of the net rope 4 is provided with a developing mark point. The pulling point of the net cable 4 is located on the axial centerline of the self-expanding stent, so that it has good symmetry, stability and safety during recovery. The mesh cables 4 protrude from the proximal end of the self-expanding stent in the shape of a dome support, the number of the mesh cables 4 is two, and the midpoints of each mesh cable 4 are connected together.

The diameter of the wire 321 of the mesh body 32 is smaller than the diameter of the wire of the self-expanding stent. The diameter of the wire 321 of the mesh body 32 is smaller than the diameter of the stent wire of the self-expandable stent, so the distance between the self-expandable stent and the artery wall will not be significantly increased, and the adhesion of the self-expandable stent will not be affected. Effect.

Example 2:

A mesh-covered stent, the rest of which are the same as in Embodiment 1, and a fusion layer is provided between the mesh body 32 and the self-expanding stent. Before the mesh body is stressed, the mesh body and the self-expanding stent form an integrated structure through the fusion layer. When the mesh body is stressed, the fusion layer breaks.

Example 3:

A mesh-covered stent as shown in Figures 6 to 9 includes a self-expandable stent and a mesh-covered 3, the mesh-covered 3 includes a ring body 31 and a mesh body 32, and the proximal side of the mesh-covered 3 is connected Web cable 4.

The self-expanding stent is a corrugated self-expanding stent 1, which includes a plurality of corrugated support rings and bridges 12, and adjacent corrugated support rings are connected through the bridges 12;

The wave-shaped support ring is provided with a limit hole 101 at its peak, and the axially adjacent peak point of the wave-shaped support ring is parallel to the axial centerline of the wave-shaped self-expanding stent 1;

The mesh body 32 of the covering mesh 3 is a tubular structure composed of mesh body mesh units and woven by a plurality of mesh wires 321, and the diagonal line of each mesh body mesh unit is in line with the wave The axial center line of the type self-expanding stent 1 is parallel, and one end of the mesh 321 is fixed on the ring body 31, and the other end of the mesh 321 is a distal end, and the distal end of the mesh 321 is fixedly connected The limiting hole 101 on the distal side of the wave-shaped self-expanding stent 1;

The ring body 31 surrounds and passes through the limiting hole 101 at the proximal end of the corrugated self-expanding stent 1 .

The connection relationship between the mesh wire 321 and the wave-type self-expanding stent 1 is as follows: the mesh wire 321 passes through the limiting hole 101 on the wave-shaped rod 11 in the middle section of the wave-type self-expanding stent 1;

The surface area of the corrugated self-expanding stent 1 covered by the mesh body 32 is 4/5 of the surface area of the corrugated self-expanding stent 1 .

The mesh cable 4 is connected to the ring body 31 of the covering mesh 3, and the pulling point of the mesh cable 4 is located on the axial centerline of the self-expanding stent.

The connection point between the net cable 4 and the ring body 31 is provided with a developing mark point;

The pulling point of the net rope 4 is provided with a developing mark point.

The diameter of the wire 321 of the mesh body 32 is smaller than the diameter of the wire of the self-expanding stent.

Example 4:

A mesh-covered stent as shown in Figures 10 to 13 includes a self-expanding stent and a mesh-covered 3, the mesh-covered 3 includes a ring body 31 and a mesh body 32, and the proximal side of the mesh-covered 3 is connected to Web cable 4.

The self-expanding stent is a braided self-expanding stent 2 composed of stent grid units, and the diagonal line of each stent grid unit is parallel to the axial centerline of the braided self-expanding stent 2 ;

The net body 32 of described covering net 3 is made up of a plurality of mesh wires 321 parallel to each other, and one end of this mesh wire 321 is fixed on the ring body 31, and the other end of this mesh wire 321 is the far-center end, and described mesh wire 321 The distal end of the braided self-expandable stent 2 is fixedly connected to the braided intersection point on the distal side of the braided self-expandable stent 2, and the mesh 321 is parallel to the axial centerline of the braided self-expandable stent 2 .

The connection relationship between the mesh wire 321 and the braided self-expanding stent 2 is: the braided intersection point of the braided self-expanding stent 2 is flexibly connected to the stop ring 201, and the distal end of the mesh wire 321 is fixed Connected to the stop ring 201 on the distal side of the braided self-expanding stent 2, the mesh 321 passes through the middle of the braided self-expanding stent 2 along the axial direction of the braided self-expanding stent 2 segment limit ring 201;

The ring body 31 surrounds and passes through the limiting ring 201 at the proximal end of the braided self-expanding stent 2;

The surface area of the braided self-expanding stent 2 covered by the mesh body 32 is 1/5 of the surface area of the braided self-expanding stent 2 .

The mesh cable 4 is connected to the ring body 31 of the covering mesh 3, and the pulling point of the mesh cable 4 is located on the axial centerline of the self-expanding stent.

The connection point between the net cable 4 and the ring body 31 is provided with a developing mark point;

The pulling point of the net rope 4 is provided with a developing mark point.

The diameter of the wire 321 of the mesh body 32 is smaller than the diameter of the wire of the self-expanding stent.

Example 5:

A mesh-covered stent as shown in Figures 14 to 17 includes a self-expanding stent and a mesh-covered 3, the mesh-covered 3 includes a ring body 31 and a mesh body 32, and the proximal side of the mesh-covered 3 is connected Web cable 4.

The self-expanding stent is a braided self-expanding stent 2 composed of stent grid units, and the diagonal line of each stent grid unit is parallel to the axial centerline of the braided self-expanding stent 2 ;

The net body 32 of the covering net 3 is a tubular structure composed of net body grid units and woven by a plurality of mesh wires 321, and the diagonal line of each net body grid unit is in line with the weaving The axial center line of the type self-expanding stent 2 is parallel, one end of the mesh 321 is fixed on the ring body 31, the other end of the mesh 321 is the distal end, and the distal end of the mesh 321 is fixedly connected The braided self-expandable stent 2 is at the braided intersection point on the distal side.

The connection relationship between the mesh wire 321 and the braided self-expanding stent 2 is: the braided intersection point of the braided self-expanding stent 2 is flexibly connected to the stop ring 201, and the distal end of the mesh wire 321 is fixed Connected to the limiting ring 21 on the distal side of the braided self-expanding stent 2, the mesh 321 passes through the limiting ring 201 of the middle section of the braided self-expanding stent 2;

The ring body 31 surrounds and passes through the limiting ring 201 at the proximal end of the braided self-expanding stent 2;

The surface area of the braided self-expanding stent 2 covered by the mesh body 32 is 1/5 of the surface area of the braided self-expanding stent 2 .

The mesh cable 4 is connected to the ring body 31 of the covering mesh 3, and the pulling point of the mesh cable 4 is located on the axial centerline of the self-expanding stent.

The connection point between the net cable 4 and the ring body 31 is provided with a developing mark point;

The pulling point of the net rope 4 is provided with a developing mark point.

The diameter of the wire 321 of the mesh body 32 is smaller than the diameter of the wire of the self-expanding stent.

Embodiment 6:

As shown in Figure 18, a net-covering support removal tool for taking out the net-covering support includes a drag hook rod 5, an inner sheath tube 6 and an outer sheath tube 7, and the head end of the drag hook rod 5 is bent. The diameter of the drag hook rod 5 gradually decreases from the tail end to the head end;

The head end of the outer sheath tube 7 expands outwards in a trumpet shape.

The use method of described covering net bracket taking out tool comprises the following steps:

Step a. Send the conventionally used expansion tube and guide wire into the outer sheath tube 7, send the outer sheath tube 7 to the blood vessel segment at the proximal end of the mesh-covered stent through the peripheral artery puncture, and withdraw the expansion tube and guide wires;

Step b. Send the retractor rod 5 into the inner sheath tube 6, send the inner sheath tube 6 to the head end of the outer sheath tube 7 through the outer sheath tube 7 and expose the head end of the outer sheath tube 7, so that the inner sheath tube 6 Reaching the vicinity of the mesh cord 4, fix the inner sheath tube 6;

Step c. push out the drag hook rod 5 from the inner sheath tube 6, make it hook the lifting point of the net rope 4, and push the inner sheath tube 6 toward the distal end of the mesh-covered support until the drag hook rod 5 is retracted to the inner Inside the sheath 6. During this process, the net cables 4 and the covering net 3 are elongated and thinned, and the covering net type support covered by the covering net 3 is also gradually deformed with the tension of the covering net 3 .

Step d. Push the outer sheath tube 7 toward the distal end of the mesh-covered stent until the inner sheath tube 6 is retracted into the outer sheath tube 7;

Step e. Continue to push the outer sheath tube 7 toward the distal end of the mesh-covered stent, so that the mesh-covered stent is separated from the arterial vessel wall through the trumpet-shaped head end of the outer sheath tube 7 until the mesh-covered stent It is gradually withdrawn into the outer sheath tube 7, and the outer sheath tube 7 is withdrawn from the blood vessel to complete the technical scheme of taking out the stent. Wherein, the covering net 3 drives the net covering support to deform under the pulling force of the drag hook rod 5, and the pipe diameter of the covering net support gradually becomes thinner and deforms from the proximal end to the distal end.

Furthermore, the method for using the tool for taking out the covering net support also includes the following steps:

After step b is completed, according to the connection point between the net rope 4 and the ring body 31, there is a developing mark point to determine the extension area where the hook rod 5 extends out of the inner sheath tube 6;

The bending direction of the head end of the drag hook rod 5 is determined when the drag hook rod 5 extends out of the inner sheath tube 6 according to the development marking point provided at the connection point between the net cable 4 and the ring body 31 .

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments, and those skilled in the art can also make various equivalents without violating the spirit of the present invention. These equivalent modifications or replacements are all included within the scope defined by the claims of the present application.

Claims (14)

1. A net-covering support, comprising self-expanding support and net-covering (3), characterized in that: a net-covering is set outside the self-expanding support, and said net-covering (3) comprises a ring body (31) and the mesh body (32), wherein the ring body (31) is flexibly connected to the proximal side of the self-expanding stent, and the distal end of the mesh body (32) is fixedly connected to the self-expanding stent; The proximal side of the covering net (3) is connected to the net cable (4); the net cable (4) is connected to the ring body (31) of the net covering (3), and the pulling The point is located on the axial centerline of the self-expanding stent. 2. The mesh-covered stent according to claim 1, characterized in that: the self-expanding stent is a wave-type self-expanding stent (1), and the wave-type self-expanding stent (1) includes a plurality of wave-type self-expanding stents (1). The supporting ring and the connecting bridge (12), the adjacent corrugated supporting rings are connected through the connecting bridge (12); The wave-shaped support ring is provided with a limit hole (101) at its wave crest, and the axially adjacent peak point of the wave-shaped support ring is parallel to the axial centerline of the wave-shaped self-expanding stent (1); The net body (32) of described covering net (3) is made up of many mesh wires (321) parallel to each other, and one end of this mesh wire (321) is fixed on the ring body (31), and the mesh wire (321) The other end is the distal end, and the distal end of the mesh (321) is fixedly connected to the limiting hole (101) on the distal side of the wave-shaped self-expanding stent (1), and the mesh (321) is connected to the The axial centerlines of the wave-type self-expanding stent (1) are parallel; The ring body (31) surrounds and passes through the limiting hole (101) at the proximal end of the wave-shaped self-expanding stent (1). 3. The net-covering support according to claim 2, characterized in that, the connection relationship between the mesh (321) and the wave-type self-expanding support (1) is: the mesh (321) is along the The axial direction of the wave-type self-expanding stent (1) passes through the limit hole (101) in the middle section of the wave-type self-expanding stent (1); The surface area of the wave-type self-expanding stent (1) covered by the mesh body (32) is 4/5-1 of the surface area of the wave-type self-expanding stent (1). 4. The mesh-covered stent according to claim 1, characterized in that: the self-expanding stent is a wave-type self-expanding stent (1), and the wave-type self-expanding stent (1) includes a plurality of wave-type self-expanding stents (1). The supporting ring and the connecting bridge (12), the adjacent corrugated supporting rings are connected through the connecting bridge (12); The wave-shaped support ring is provided with a limit hole (101) at its wave crest, and the axially adjacent peak point of the wave-shaped support ring is parallel to the axial centerline of the wave-shaped self-expanding stent (1); The mesh (32) of the covering mesh (3) is a tubular structure composed of mesh mesh units and woven by a plurality of mesh wires (321). The diagonal of each mesh mesh unit The line is parallel to the axial centerline of the wave-type self-expanding stent (1), one end of the mesh (321) is fixed on the ring body (31), and the other end of the mesh (321) is the far The heart end, the distal end of the mesh (321) is fixedly connected to the limiting hole (101) on the distal side of the wave-shaped self-expanding stent (1); The ring body (31) surrounds and passes through the limiting hole (101) at the proximal end of the wave-shaped self-expanding stent (1). 5. The mesh-covered stent according to claim 4, characterized in that, the connection relationship between the mesh (321) and the wave-type self-expanding stent (1) is: the mesh (321) is connected The limiting hole (101) on the wave-shaped rod (11) in the middle section of the wave-shaped self-expanding stent (1); The surface area of the wave-type self-expanding stent (1) covered by the mesh body (32) is 4/5-1 of the surface area of the wave-type self-expanding stent (1). 6. The network-covered support according to claim 1, characterized in that: the self-expanding support is a braided self-expanding support (2) composed of support grid units, and the pair of each support grid unit The angle line is parallel to the axial centerline of the braided self-expanding stent (2); The net body (32) of described covering net (3) is made up of many mesh wires (321) parallel to each other, and one end of this mesh wire (321) is fixed on the ring body (31), and the mesh wire (321) The other end is the distal end, and the distal end of the mesh (321) is fixedly connected to the braided intersection point on the far-center side of the braided self-expanding stent (2), and the mesh (321) and the braided The axial centerlines of the type self-expanding stent (2) are parallel. 7. The net-covering support according to claim 6, characterized in that, the connection relationship between the mesh (321) and the braided self-expanding support (2) is: the braiding self-expanding support ( 2) the braided cross point is flexibly connected to the limit ring (201), and the distal end of the mesh wire (321) is fixedly connected to the limit ring (201) on the distal side of the braided self-expanding stent (2) , the mesh (321) passes through the stop ring (201) of the middle section of the braided self-expanding stent (2) along the axial direction of the braided self-expanding stent (2); The ring body (31) surrounds and passes through the limit ring (201) at the proximal end of the braided self-expanding stent (2); The surface area of the braided self-expanding stent (2) covered by the mesh body (32) is 1/5-1 of the surface area of the braided self-expanding stent (2). 8. The net-covered support according to claim 1, characterized in that: the self-expanding support is a braided self-expanding support (2) composed of support grid units, and the pair of each support grid unit The angle line is parallel to the axial centerline of the braided self-expanding stent (2); The mesh (32) of the covering mesh (3) is a tubular structure composed of mesh mesh units and woven by a plurality of mesh wires (321). The diagonal of each mesh mesh unit The line is parallel to the axial centerline of the braided self-expanding stent (2), one end of the mesh (321) is fixed on the ring body (31), and the other end of the mesh (321) is the far The distal end of the mesh wire (321) is fixedly connected to the braided cross point on the distal side of the braided self-expandable stent (2). 9. The mesh-covered support according to claim 8, characterized in that, the connection relationship between the mesh (321) and the braided self-expanding support (2) is: the braided self-expanding support ( 2) the braided cross point is flexibly connected to the stop ring (201), and the distal end of the mesh wire (321) is fixedly connected to the stop ring (21) on the far-center side of the braided self-expanding stent (2) , the mesh (321) passes through the stop ring (201) of the middle section of the braided self-expanding stent (2); The ring body (31) surrounds and passes through the limit ring (201) at the proximal end of the braided self-expanding stent (2); The surface area of the braided self-expanding stent (2) covered by the mesh body (32) is 1/5-1 of the surface area of the braided self-expanding stent (2). 10. The net-covering support according to claim 1, characterized in that: the connection point between the net cable (4) and the ring body (31) is provided with a developing mark point; The pulling point of the net cable (4) is provided with a developing mark point. 11. The mesh-covered stent according to claim 1, characterized in that: the diameter of the wires (321) of the mesh body (32) is smaller than the diameter of the wires of the self-expanding stent. 12. The mesh-covered stent according to claim 1, characterized in that: a fusion layer is provided between the mesh body (32) and the self-expanding stent. 13. A tool for taking out a mesh-covered stent as claimed in any one of claims 1 to 12, comprising a drag hook rod (5), an inner sheath (6) and an outer sheath (7), characterized in In that: the head end of the drag hook rod (5) is bent, and the diameter of the drag hook rod (5) gradually decreases from the tail end to the head end; The head end of the outer sheath tube (7) expands outwards in a trumpet shape. 14. A system for implanting and taking out a net-covered stent, comprising a net-covered support and a net-covered support taking-out tool as claimed in any one of claims 1 to 12, and said net-covering support taking-out tool includes a hook rod (5) , inner sheath tube (6) and outer sheath tube (7), it is characterized in that: the head end of described drag hook bar (5) is bent shape, and the diameter of this drag hook bar (5) is from tail end to head end gradually Decrease; the head end of the outer sheath tube (7) expands outwards in the shape of a trumpet.