CN212490280U - Novel close net support of lumen - Google Patents

Abstract

The utility model discloses a novel close net support of lumen. The key point is that the pipe cavity dense net support is provided with a dense net area (1), the front end of the dense net area (1) is woven with a transition area (2) and an end area (3), the tail end of the dense net area (1) is woven with a second end area (4) of a dense net structure, the second end area (4) is provided with an end folding area (5), the end folding area (5) is connected with a release end (6), and an included angle alpha between the weaving wires in the dense net area (1) and the second end area (4) and the diameter of the dense net support is 30-42 degrees. The utility model discloses the close net support of lumen that has splendid compliance, good radial/axial bearing capacity has extensive application.

Description

Novel close net support of lumen

The technical field is as follows:

the utility model relates to a medical apparatus implanted in the human body, in particular to a human body lumen bracket which can be implanted in the human body lumen and used for supporting.

Background art:

the tubular stent formed by weaving metal wires is a medical apparatus commonly used for interventional therapy at present, the most common is a stent used in the field of cardiovascular, the existing grid stent is used for improving the radial supporting capacity, relatively thick metal wires are generally used for weaving, the weaving mode is that left-hand wires and right-hand wires are mutually crossed and woven, namely the weaving mode of commonly called 'one wire presses one wire', and in a conventional state, the included angle between two crossed wires is about 90 degrees, the stent of the weaving mode has the advantages of convenience in weaving and uniform supporting capacity of the stent, but the defects are that the sum of the sections of the metal wires is high, a film of organic materials is particularly easy to generate a film climbing phenomenon, the axial compression ratio of the stent is too high, and two ends are not easy to position when in use. Besides the defects of the existing metal wire woven stent, the stent is also used for thin blood vessels or human body lumens, particularly artery and vein systems of blood vessels at the superficial positions of the human body, such as jugular vein, dorsal foot artery and the like, if the stent with the existing structure is used, the problems exist, the human body lumens at special human body positions, such as the lumens at bending positions or the blood vessels, the existing stent has poor bending capability, large stress acts on the wall surfaces of the lumens in the bending state, the lumens are possibly damaged, and when the existing stent is bent, the cross sections of the stent at the bending parts are changed into flat shapes, so that the effect of the stent is reduced. Therefore, the stents in the prior art still have a plurality of human body lumens which cannot be adapted to, and how to solve the existing defects is a task which is urgent to solve and has important significance.

The utility model has the following contents:

the utility model aims at disclosing a close net support of lumen that has splendid compliance, good radial/axial support ability, has extensive application.

Realize the utility model discloses a technical solution as follows: the tube cavity dense mesh support is provided with a dense mesh area, the front end of the dense mesh area is woven with a transition area and an end area, the tail end of the dense mesh area is woven with a second end area of a dense mesh structure, the second end area is woven with an end furling area, the end furling area is connected with a release end, and an included angle alpha between the woven wires in the dense mesh area and the second end area and the diameter of the dense mesh support is 30-42 degrees.

The tube cavity dense mesh support is formed by weaving metal material weaving wires, or is formed by weaving nonmetal material weaving wires, or is formed by mixing and weaving metal material weaving wires and nonmetal material weaving wires.

The mesh weaving density of the end area is less than that of the transition area, and the mesh weaving density of the transition area is less than that of the dense mesh area and the second end area.

The transition area, the end area and the second end area are conical, or the mesh weaving density of the end furling area is smaller than that of the end area, and the end furling area is connected with a plurality of pull ropes connected with the release end; or the mesh weaving density of the end part furling area is the same as that of the dense mesh area, and the dense mesh of the end part furling area is gradually furled and connected with the release end.

The woven meshes of the dense mesh area are provided with transverse reinforcing meshes or axial reinforcing meshes.

The transverse reinforcing grid is formed by pressing two right-hand yarns upwards by one left-hand yarn and then pressing the two right-hand yarns upwards by the other adjacent left-hand yarn and the previous left-hand yarn in a staggered manner in the radius direction, and then pressing the two right-hand yarns upwards by the two right-hand yarns.

The transverse reinforcing grid is formed by pressing three right-direction wires upwards by one left-direction wire, pressing four right-direction wires upwards by the three right-direction wires; after the adjacent left-hand filament presses up the four continuously distributed right-hand filaments comprising the two right-hand filaments, the adjacent left-hand filaments are pressed up by the three right-hand filaments and then press up the two right-hand filaments.

The axial reinforcing grid is formed by pressing two right-hand yarns upwards by one left-hand yarn, then pressing the two right-hand yarns upwards by the other adjacent left-hand yarn, and enabling an upward pressing cross point to be flush with the upward pressing cross point of the left-hand yarn and the two right-hand yarns in the axial direction, and then pressing the two right-hand yarns upwards by the two left-hand yarns; or one left-direction filament is pressed upwards by three right-direction filaments and then is pressed upwards by three right-direction filaments, the other adjacent left-direction filament is also pressed upwards by three right-direction filaments, the upward pressing cross point is aligned with the upward pressing cross point of the left-direction filament and the three right-direction filaments in the axial direction, and then the left-direction filament is pressed upwards by the three right-direction filaments.

The axial reinforcing grid is formed by pressing three right-direction threads upwards by one left-direction thread, then pressing three right-direction threads upwards by two right-direction threads, then pressing four right-direction threads upwards by another adjacent left-direction thread, pressing three right-direction threads upwards by one staggered left-direction thread, then pressing four right-direction threads upwards by another adjacent left-direction thread, and pressing three right-direction threads upwards by two right-direction threads.

The utility model adopts the thin metal wire to weave, under the condition that the section area of the metal wire is small, because the dense net support of the utility model has various structures such as transverse reinforcement or axial reinforcement due to the partition structure with different weaving densities and the distribution of special weaving metal wires, the key is that the structure and the weaving mode lead the dense net support to have excellent flexibility and excellent shape-preserving performance, thus leading the utility model to have excellent application performance in the lumen of the human body, in particular to be used for the superficial positions of the human body such as the arteriovenous of jugular vein, the dorsal foot artery and the like, because the ultrafine dense mesh stent with smaller diameter can be woven, the ultrafine dense mesh stent can also be applied to the inside of a human body lumen at a bending position, the dense mesh stent which can be taken out has excellent safety, and can be particularly used for non-vascular lumens of human biliary tract, urethra, intestinal tract and the like.

Description of the drawings:

fig. 1 is a schematic general structural diagram of a first embodiment of the dense mesh stent of the present invention.

Fig. 2 is a schematic view of the overall structure of a second embodiment of the dense mesh stent of the present invention.

Fig. 3 is a schematic view of the third embodiment of the dense mesh stent of the present invention.

Fig. 4 is a right-view structural schematic diagram of the dense mesh stent of fig. 1 to 3.

Fig. 5 is a schematic perspective view of a portion P-P in fig. 1.

Fig. 6 is a schematic perspective view of a portion P-P in fig. 2.

Fig. 7 is a schematic perspective view of a portion P-P in fig. 3.

Fig. 8 is a structural diagram of a first weaving mode of the dense mesh zone.

Fig. 9 is a structural diagram of a second weaving mode of the dense mesh area.

Fig. 10 is a structural diagram of a third weaving mode of the dense mesh zone.

Fig. 11 is a structural diagram of a fourth weave pattern of the dense mesh region.

Fig. 12 is a structural diagram of a fifth weaving mode of the dense mesh zone.

The specific implementation mode is as follows:

the detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be noted that the detailed description of the embodiments is provided for comprehensive understanding of the technical solution of the present invention, and should not be construed as limiting the scope of the claims of the present invention.

Referring to fig. 1 to 12, the technical solution of the embodiment of the present invention is: the pipe cavity dense mesh support is provided with a dense mesh area 1, the front end of the dense mesh area 1 is woven with a transition area 2 and an end area 3, the tail end of the dense mesh area 1 is woven with a second end area 4 of a dense mesh structure, the second end area 4 is woven with an end folding area 5, the end folding area 5 is connected with a release end 6, and an included angle alpha between the metal wires in the dense mesh area 1 and the second end area 4 and the diameter of the dense mesh support is 30-42 degrees; the front end in the above description refers to the end of the lumen dense mesh stent which firstly enters the human body lumen, i.e. the left end in fig. 1-3, and the tail end refers to the end of the lumen dense mesh stent which finally enters the human body lumen, i.e. the right end in fig. 1-3. The utility model discloses a dense net support of lumen is woven by the more thin wire of the used wire of many than prior art's weaving support and is formed, or says so the utility model discloses a cross-sectional area sum of all wires of dense net support of lumen is less than prior art with the cross-sectional area sum of all wires of weaving the support of diameter size and length, this one side has reduced the quantity that gets into the foreign matter wire of human body intracavity, the density of the metal mesh that the finer wire of on the other hand was woven can be increased by a wide margin, the dense net district 1 that has increased to weave density has fairly good radial support ability, and can weave out the dense net support of lumen that the diameter is fairly little, it has and is used for splendid bendability or compliance. The tube cavity dense mesh support of the utility model can be woven by a plurality of metal wires, or non-metal wires, or mixed woven by metal wires and non-metal wires, for example, the dense mesh support is woven by the same metal material wires, such as NiTi alloy, stainless steel, cobalt-based alloy, magnesium alloy material, etc.; in order to improve the human body internal development, different metal material wires can be adopted for mixed weaving, such as mixed weaving of a NiTi alloy wire and a platinum wire, a NiTi alloy wire and a cobalt-based alloy wire, and a NiTi alloy wire and a tungsten wire, wherein the NiTi alloy wire accounts for 25-95%; in order to reduce the metal content and realize partial degradation, a mixed weaving of a metal material and a degradable material is adopted, for example, a mixed weaving of a NiTi alloy wire and a magnesium alloy wire, and a mixed weaving of a NiTi alloy wire and a polylactic acid wire, wherein the NiTi alloy wire accounts for 20-80%; or woven with non-metal material such as nylon, PTFE, polylactic acid, etc. Another important advantage of the utility model is that the dense mesh stent of lumen has different partitions, especially has dense mesh region 1 and second end region 4 with dense mesh structure, and its radial strong supporting force makes the dense mesh stent of lumen not move in the lumen of human body, which is especially significant for application to the arterial system of human body; the included angle alpha between the metal wires in the dense mesh area 1 and the diameter of the dense mesh stent in the second end area 4 is 30-42 degrees, preferably 30-40 degrees, that is, the included angle alpha is an acute angle, one metal wire is in a spiral state in the dense mesh area 1 and the second end area 4, and because the included angle alpha is an acute angle, that is, the pitch of the spiral metal wire is smaller, and the smaller the included angle alpha is, the smaller the pitch of the metal wire is, the axial compression ratio of the lumen dense mesh stent during deformation is substantially reduced, that is, the axial supporting capability of the lumen dense mesh stent is enhanced, and the axial flow conductivity of the lumen dense mesh stent is increased.

The mesh weaving density of the end part area 3 of the tube cavity dense mesh bracket is less than that of the transition area 2, and the mesh weaving density of the transition area 2 is less than that of the dense mesh area 1 and the second end part area 4; the mesh weaving density of the end part area 3 is the minimum, the mesh weaving density has the maximum deformation capacity, so the damage of the end head of the end part area 3 to the inner wall surface of the lumen of a human body is not easy to cause, the dense mesh area 1 and the second end part area 4 have the maximum weaving density, and the mesh weaving density is used as the main body of the lumen dense mesh support, has stronger radial supporting capacity and axial supporting capacity, ensures that the lumen of the human body is supported and has flow guiding capacity, and the lower weaving density of the end part area 3 and the transition area 2 further reduces the total amount of metal wires.

The transition region 2, the end region 3 and the second end region 4 in the tube cavity dense mesh stent are in a conical shape (shown in figures 1-3); that is to say that the diameter of transition zone 2 and tip district 3 is greater than the diameter of dense net district 1, has improved radial support ability, and the radial support ability of second tip district 4 also improves to the combined action has further improved the anti displacement's of lumen dense net support ability, has avoided lumen dense net support to lose treatment because of the displacement. The mesh weaving density of the end part furling area 5 is less than that of the end part area 3, the end part furling area 5 is connected with a plurality of pull ropes connected with the release end 6, and the smaller density of the end part furling area 5 reduces the using amount of metal wires, increases the flexibility and reduces the damage to the wall surface of the tube cavity; or the mesh weaving density of the end part furling area 5 is the same as that of the mesh weaving density of the dense mesh area 1, the dense mesh of the end part furling area 5 is gradually furled and connected with the release end 6, and the end part furling area 5 still contributes to the axial supporting capacity at the moment, so that the displacement resistance is improved, and the device is particularly suitable for an arterial system.

The above-mentioned release tip 6 is positioned in an eccentric configuration in order to reduce the obstruction to the fluid. The end folding area 5 is divided into three types according to the structural form, the first type is a plaited form (shown in figure 1), namely three points a, b and c in figures 8-12 are gathered together to be connected with the release end 6 (shown in figure 5), and the release end is positioned in an eccentric structural form; the second type is a two-half type (shown in figure 2), namely, the grid of the folding area 5 is divided into two halves, the grid of each half is mutually wound, and then the two halves of the wound grid are folded together to be connected with a release end 6 (shown in figure 6) and positioned in an eccentric structure; the third is a single point type (shown in fig. 3), i.e., the grid of the furled area 5 is all gathered and wound as a point, connected to the release tip 6 (shown in fig. 7), and positioned in an eccentric configuration.

The utility model has been introduced in the foregoing the utility model discloses there is the structure of different density of weaving, and the utility model discloses an another key structural design be the net of dense net district 1 weave in have radial reinforcing net or axial reinforcing net, because the preceding has been introduced the utility model discloses a form is woven by the less many fine metal wires of wire total amount, have fine flexible performance or compliance, it is also very necessary to have fine radial support performance and good axial support performance again when nevertheless having fine bending property, this makes the dense net support of lumen have more unique and comprehensive performance.

The radial reinforced grid of the dense mesh area 1 of the tubular cavity dense mesh stent is formed by pressing two right-direction wires 8 upwards by one left-direction wire 7, then pressing two right-direction wires 8 upwards by the other adjacent left-direction wire 7 and the previous left-direction wire 7, which are staggered in the radius direction, pressing two right-direction wires 8 upwards by one right-direction wire 8, and then pressing the other left-direction wire 7 and the right-direction wire 8 upwards by the two right-direction wires 8, which are all woven as described above (shown in fig. 8), it is to be noted that the left-direction wire 7 refers to a wire going from the left edge to the right upper direction as shown in fig. 8, and the right-direction wire 8 refers to a wire going from the right edge to the left upper direction, as the area a in fig. 8 is a radially distributed upwards pressing area, that is the radial reinforced grid, which improves the radial supporting capability of the dense mesh stent woven by thin metal wires, and the enhancement of the radial supporting capability comes from the fact that the included angle alpha between the left-direction wire 7 or/and the right-direction wire, when the dense mesh stent is subjected to a force in the radial direction, the left-direction wire 7 or/and the right-direction wire 8 have a larger resistance to the force in the radial direction, and the other is that the friction force between the wires during radial deformation is increased in the weaving direction. The dense net area 1 shown in fig. 8 has strong radial supporting force and torque resistance, and is suitable for the stenosis of small blood vessels/lumens.

In order to further improve the radial supporting capacity of the pipe cavity dense mesh support, the radial reinforcing mesh of the dense mesh area 1 is formed by pressing two right-direction wires 8 on one left-direction wire 7, pressing the right-direction wires 8 on the left-direction wire, and pressing four right-direction wires 8 on the right-direction wire; after four continuously distributed right-direction filaments 8 including the two right-direction filaments 8 are pressed upwards by an adjacent left-direction filament 7, the adjacent left-direction filament is pressed upwards by the three right-direction filaments 8 and then pressed upwards by the two right-direction filaments 8 (shown in fig. 9), and the area a in fig. 9 is a radial reinforcing grid which is radially distributed, and compared with the radial reinforcing grid, the radial supporting capacity of the radial reinforcing grid is further enhanced, and the enhancing mechanism is the same as that of the radial reinforcing grid. The dense mesh region 1 shown in fig. 9 has strong radial supporting force and anti-torque force, has a 3D mesh effect, and is suitable for the stenosis of a large blood vessel/lumen.

In addition to the need to improve the radial support capacity of the lumen dense mesh stent, the axial support capacity of the lumen dense mesh stent also needs to be enhanced in many cases, in fact, as described above, because the included angle α between the metal wire and the diameter of the lumen dense mesh stent is small, for one metal wire, the metal wire exists in the whole lumen dense mesh stent in a spiral manner, so the pitch is small, and when the lumen dense mesh stent is subjected to an axial force, more metal wires resist the axial force. In order to further increase the axial supporting capacity of the lumen dense mesh stent, the axial reinforcing mesh of the dense mesh region 1 is formed by pressing two right-direction wires 8 on one left-direction wire 7 and then pressing the two right-direction wires 8, the other adjacent left-direction wire 7 also presses two right-direction wires 8, the upward pressing cross point is aligned with the upward pressing cross point of the left-direction wire 7 and the two right-direction wires 8 in the axial direction, and then the upward pressing cross point is pressed by the two right-direction wires 8 (shown in fig. 11), and the region b in fig. 11 is the axial reinforcing mesh; or after the three right-direction wires 8 are pressed upwards by the one left-direction wire 7, the three right-direction wires 8 press upwards, the other adjacent left-direction wire 7 also presses upwards the three right-direction wires 8, and the upward pressing cross points are aligned with the upward pressing cross points of the one left-direction wire 7 and the three right-direction wires 8 in the axial direction and then pressed upwards by the three right-direction wires 8 (shown in fig. 10); the plurality of axial strengthening grid areas b exist in one dense mesh support, so that the friction force between the metal wires during axial compression or deformation is further improved, and the axial supporting capacity, namely the axial flow guiding capacity, is improved. The dense net area 1 shown in fig. 10 has strong axial flow conductivity, and is suitable for mild stenosis and repair of a large blood vessel/lumen; the dense net area 1 shown in fig. 11 has strong axial flow conductivity, is not easy to generate hyperplasia, and is suitable for mild stenosis of small blood vessels/lumens.

In order to further improve the axial supporting capacity of the lumen dense mesh support, the axial reinforcing mesh is formed by pressing three right-direction wires 8 by one left-direction wire 7, pressing the three right-direction wires 8 upwards after pressing the two right-direction wires 8, pressing the four right-direction wires 8 upwards, pressing the three right-direction wires 8 upwards by another adjacent left-direction wire 7 in a staggered manner, pressing the three right-direction wires 8 upwards by one grid, pressing the three right-direction wires 8 upwards by two right-direction wires 8 (shown in figure 12), and an area b in figure 12 is an axial reinforcing mesh area. The dense net region 1 shown in fig. 12 has strong axial flow conductivity, and is suitable for medium stenosis and repair of large vessels/lumens.

Because the utility model discloses a close net support of lumen has radial reinforcing net regional an or the regional b of axial reinforcing net, has good support to the radial effort from human lumen to, makes the utility model discloses can be used for the lumen of human shallow surface position, owing to have splendid compliance, close net support of lumen can keep the section face of the close net support of lumen of basic unchangeable or only have very little change's performance under little bending radius, make it to be used for crooked human lumen, this has greatly improved the range of application of close net support of lumen in the human body.

Claims (9)

1. The utility model provides a novel close net support of lumen, its characterized in that close net support of lumen has one to close net district (1), and transition district (2) and tip district (3) have been woven to the front end in close net district (1), and the tail end in close net district (1) is woven second tip district (4) of close net structure, and second tip district (4) have tip to draw in district (5), and tip draws in district (5) and is connected with a release end (6), close net district (1) and second tip district (4) in the contained angle alpha between the weaving silk and the diameter of close net support be between 30 ~ 42.

2. The novel dense mesh stent for lumens as set forth in claim 1, wherein said dense mesh stent for lumens is woven from woven wires of metallic material, or woven wires of non-metallic material, or a mixture of woven wires of metallic material and woven wires of non-metallic material.

3. A novel luminal dense net stent as defined in claim 1 or 2 wherein the mesh weave density of the end zone (3) is less than the mesh weave density of the transition zone (2) and the mesh weave density of the transition zone (2) is less than the mesh weave density of the dense net zone (1) and the second end zone (4).

4. A novel dense mesh stent for lumens as set forth in claim 3, wherein said transition region (2) and said end region (3) and said second end region (4) are conical, or wherein the mesh weave density of said end closing region (5) is less than the mesh weave density of said end region (3), said end closing region (5) being connected to a plurality of pull cords connected to said release tip (6); or the mesh weaving density of the end part furling area (5) is the same as that of the dense mesh area (1), and the dense mesh of the end part furling area (5) is gradually furled and connected with the release end (6).

5. A novel tubular dense net support according to claim 4, characterized in that the woven meshes of the dense net region (1) comprise transverse reinforcing meshes or axial reinforcing meshes.

6. The novel tubular cavity dense net support according to claim 5, characterized in that the transverse reinforcing grid is formed by pressing two right-hand threads (8) on one left-hand thread (7) and then pressing the two right-hand threads (8), and the other adjacent left-hand thread (7) and the previous left-hand thread (7) are staggered in the radius direction, and pressed by two right-hand threads (8) and then pressed by two right-hand threads (8).

7. The novel tubular cavity dense net support frame as claimed in claim 5, characterized in that the transverse reinforcing grid is formed by pressing three right-direction wires (8) upwards by one left-direction wire (7), then pressing four right-direction wires (8) upwards by three right-direction wires (8); after the adjacent left-direction silk (7) presses up the four continuously distributed right-direction silks (8) comprising the two right-direction silks (8), the adjacent left-direction silk is pressed up by the three right-direction silks (8) and then presses up the two right-direction silks (8).

8. The novel tubular cavity dense net support is characterized in that the axial reinforcing grid is formed by pressing two right-direction wires (8) upwards by one left-direction wire (7), then pressing the two right-direction wires (8) upwards by the other adjacent left-direction wire (7), enabling an upward pressing cross point to be flush with the upward pressing cross point of the left-direction wire (7) and the two right-direction wires (8) in the axial direction, and then pressing the upward pressing cross point by the two right-direction wires (8); or one left-direction wire (7) is pressed up by the three right-direction wires (8) after pressing up the three right-direction wires (8), the other adjacent left-direction wire (7) is also pressed up by the three right-direction wires (8) and the pressing-up cross points are aligned with the pressing-up cross points of the left-direction wire (7) and the three right-direction wires (8) in the axial direction, and then the three right-direction wires (8) are pressed up.

9. The novel pipe cavity dense net support is characterized in that the axial reinforcing grid is formed by pressing three right-direction wires (8) upwards by one left-direction wire (7), then pressing three right-direction wires (8) upwards by two right-direction wires (8), then pressing four right-direction wires (8) upwards, pressing three right-direction wires (8) upwards by another adjacent left-direction wire (7) in a staggered mode, then pressing four right-direction wires (8), and pressing three right-direction wires (8) upwards by two right-direction wires (8).

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