WO2018120414A1

WO2018120414A1 - Filter

Info

Publication number: WO2018120414A1
Application number: PCT/CN2017/075790
Authority: WO
Inventors: 张庭超; 李阳; 赵珺
Original assignee: 杭州唯强医疗科技有限公司
Priority date: 2016-12-26
Filing date: 2017-03-06
Publication date: 2018-07-05
Also published as: CN110062610A; CN110325148A; CN207220906U; WO2018121114A1

Abstract

A filter, comprising a support part (1200) used for preventing tilting of the filter and a filter part (1100) used for capturing emboli; in a free state, the support part (120) comprises at least three support rods (1200a) radiating outward from the centre, all of the support rods (1200a) being arranged axisymmetrically; the tail end of the support rods (1200a) or a tangent of the tail end of the support rods (1200a) forms a β≥180° included angle with the central axis of the support part (1200), and the maximum outer diameter of the support part (1200) matches the inner diameter of a blood vessel, such that the support rod (1200a) points are supported on the inner wall of the blood vessel. The present filter is in point contact with the inner walls of a blood vessel, prevents tilting of the instrument, and has a uniform radial support force, effectively reducing endothelial coverage, facilitating instrument capture and recycling, reducing operating time, and prolonging the service life of the instrument.

Description

Title of the invention: a filter

Technical field

[0001] The present invention belongs to the technical field of medical devices and relates to a filter.

Background technique

[0002] Pulmonary embolism (PE) is a common disease, most pulmonary embolism is caused by deep vein thrombosis (DVT) in the lower extremities or pelvis, and the formation of blood clots may migrate back to the heart through the veins and into the lungs. Pulmonary infarction is caused by loss of blood and oxygen supply to a portion of the lungs. According to statistics, the mortality rate of untreated pulmonary embolism is 20%-30%; the number of newly added cases accounts for 0.2% of the total population every year. According to China's 1.35 billion population, there are about 2.7 million new patients each year.

[0003] Filters have been clinically proven to reduce the incidence of pulmonary embolism. In the prior art, the filter structure mainly includes two types of cage filters of TrapEase structure (such as Cordis TRAPEASE/

Strut-type filters from OPTEASE and LifetechAegisy) and Kimray-Greenfield structures (eg Boston Scientific Greenfield, St.JudeAmplatz, Bard Denali, COOK Celect and Rex Medical Option).

[0004] The disadvantages of the TmpEase structure filter are: In order to strengthen the fixation effect of the instrument in the inferior vena cava, the area of the rod contacting the blood vessel wall is increased, but the increase of the area is likely to cause the endothelium to climb the pole, in the recovery device During the process, it is easy to tear the endothelium and damage the blood vessel wall, and even cause the device to be unrecyclable.

[0005] The disadvantages of the Kimray-Greenfield structure filter are: When the instrument is implanted in the inferior vena cava, the instrument is easily tilted after implantation into the inferior vena cava due to poor self-centering ability of the conical instrument. Close to the blood vessel wall; During the recycling process, the recovery device can not capture the recovery head smoothly, which will increase the operation time of the device, and even lead to the failure of the recovery operation of the device.

technical problem

[0006] The disadvantages of the filter of TmpEase structure are: In order to strengthen the fixation effect of the instrument in the inferior vena cava, the area of the rod contacting the vessel wall is increased, but the increase of the area is likely to cause the endothelium to climb the pole, in the recovery device During the process, it is easy to tear the endothelium and damage the blood vessel wall, and even cause the device to be unrecyclable.

[0007] The disadvantages of the Kimray-Greenfield structure of the filter are: when the instrument is implanted in the inferior vena cava, due to the circle The self-centering ability of the cone device is poor. The instrument is easy to tilt after being implanted into the inferior vena cava. After the instrument is tilted, the recovery head is close to the vessel wall. During the recycling process, the recovery device cannot smoothly capture the recovery head, which increases the operation of the instrument. During the day, even the recycling operation of the device failed.

Problem solution

Technical solution

[0008] The technical problem to be solved by the present invention is to provide a filter which has a higher radial support force in contact with the inner wall of the blood vessel and prevents the inclination of the instrument against the above-mentioned defects of the prior art, and the filter of the present invention can effectively reduce the filter. Endothelial climbing, which facilitates instrument capture and recovery, shortens surgical stenosis, and extends device life

[0009] The technical solution adopted by the present invention to solve the technical problem thereof is: a filter including a support portion for preventing the filter from tilting, and a filter portion for capturing the plug;

[0010] in the free state, the support portion includes at least three support rods radiated outward from the center and all of the support rods are arranged in an axisymmetric manner;

[0011] The tangential line of the end of the support rod or the end of the support rod is at an angle β ≥ 180° with the central axis of the support portion, and the maximum outer diameter of the support portion is matched with the inner diameter of the blood vessel such that the support rod point is supported on the inner wall of the blood vessel. .

[0012] In the filter, preferably, the support rod includes a first support segment and a second support segment that are radiated outward from the center;

[0013] The angle between the tangent of each point on the first support section or the first support section and the central axis is 0-90°, and the tangent and the central axis of each point on the second support section or the second support section The angle β ≥ 90°, and the angle between the tangent of the end or end of the second support section and the central axis β ≥ 180°; the angle between the first support section and the second support section or the first support section and the second The angle of the tangent of each point on the support section is γ ≥ 180°; the second support section of the support rod is supported on the inner wall of the blood vessel.

[0014] In the filter, it is preferable that the shape of the support rod in a free state satisfies: 02 < half of the inner diameter of the blood vessel, and D1 < half of the inner diameter of the blood vessel, D1 : a second boundary line at a tangent line at the end of the support rod , the distance between the farthest point of the support rod relative to the second boundary line and the second boundary line; D2: the third boundary line is a straight line passing through the end of the support rod and perpendicular to the second boundary line, and the support rod is opposite to the third The distance from the farthest point on the outer side of the boundary line.

[0015] Among the filters, it is preferable that the D1<17 mm and D2<8 mm. [0016] In the filter, preferably, the first support segment and the second support segment are each at least one of a curved segment, a straight segment, and a polygonal segment.

[0017] Among the filters, preferably, the first support section and the second support section are curves in which the radius of curvature continuously changes.

, the radius of curvature is gradually reduced.

[0018] In the filter, preferably, the second support section of the support rod includes a first subsection, a second subsection, and a third subsection;

[0019] wherein, the radius of curvature of the second sub-segment is smaller than the first sub-segment, and the angle between the second sub-segment and the central axis is changed from 90° ≤ β < 180° to β ≥ 180°, forming an inner wall surface of the blood vessel Point contact

[0020] or the second sub-section is a curved line or a broken line, forming a C-shaped or V-shaped structure with the cornice facing the central axis, the second sub-section is in point contact with the inner wall surface of the blood vessel, and the first sub-section and the third sub-section are straight lines. Or a fold line, and the second support section is entirely curved away from the filter portion or toward the filter portion.

[0021] Among the filters, it is preferable that the first support section and the second support section each have a smooth transition and a smooth transition therebetween.

[0022] In the filter, preferably, the end of the support rod is provided with an anchor for limited penetration into a blood vessel.

[0023] In the filter, preferably, the filter portion is a strut structure, or the filter portion is a cage structure.

[0024] In the filter, it is preferable that the support portion is connected to a recovery portion for recovering the entire filter.

Advantageous effects of the invention

Beneficial effect

[0025] The present invention realizes point support through the support rod of the support portion, the support portion is an axisymmetric structure, and at least three support rods form a stable support, so that the instrument has better self-center performance, preventing the instrument from tilting, and the support portion is the largest. The outer diameter is matched with the inner diameter of the blood vessel. The support rod is supported on the inner wall of the blood vessel, and the contact area with the inner wall of the blood vessel is small, which reduces the endothelial climbing, which is beneficial to the recovery and recovery of the instrument, shortens the operation time, increases the service life of the instrument, and prolongs the recovery period. . And the structure of the support rod is a flipped structure, and the angle between the tangent of the end of the support rod or the end of the support rod and the central axis is ≥180°, which ensures that the end of the support rod is curled after the release process and release of the filter, the support rod The end of the end does not penetrate the inner wall of the blood vessel, ensuring safe use of the filter.

Brief description of the drawing

DRAWINGS The present invention will be further described with reference to the accompanying drawings and embodiments in which:

1 is a schematic structural view of Embodiment 1 of the present invention;

Figure 2 is a plan view of Figure 1;

3 is a schematic structural view of a first embodiment of a support rod according to Embodiment 1 of the present invention;

4 is a schematic structural view of a second embodiment of a support rod according to Embodiment 1 of the present invention;

5 is a schematic structural view of a third embodiment of a support rod according to Embodiment 1 of the present invention;

6 is a schematic structural view showing an initial stage of release of a support rod in a filter release process according to Embodiment 1 of the present invention;

7 is a schematic structural view showing a middle stage of release of a support rod during a filter release process according to Embodiment 1 of the present invention;

8 is a schematic structural view showing a later stage of release of a support rod in a filter release process according to Embodiment 1 of the present invention;

9 is a schematic structural view of Embodiment 2 of the present invention;

Figure 10 is a partial enlarged view of a portion I in Figure 9;

11 is a schematic structural view of Embodiment 3 of the present invention;

Figure 12 is a partial enlarged view of M at Figure 11;

13 is a schematic structural view of Embodiment 4 of the present invention;

14 is a partial structural view showing the fixing of a support rod according to Embodiment 4 of the present invention;

15 is a schematic structural view of Embodiment 6 of the present invention;

16 is a schematic structural view of Embodiment 7 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0043] In order to more clearly understand the technical features, objects and advantages of the present invention, the specific embodiments of the present invention are described in detail with reference to the accompanying drawings.

[0044] The orientation definition of the present invention: the location of the recovery section is the top, and the location of the filter section is the bottom. The filter is an axisymmetric structure, and the various portions of the filter are axially symmetrical with respect to the central axis of the filter. The central axis described in the present invention is the central axis of the filter, and is also the central axis of the support portion and the filter portion.

[0045] There are two states in the filter of the present invention, one is a free state after release, and the other is a restrained contraction state in the income delivery catheter. In the following embodiments, the structure and shape are generally free after release. The structure and shape underneath.

[0046] The filter is classified into a recyclable filter and a permanent filter depending on the possibility of recovery. The permanent filter mainly includes support And a filter, the recyclable filter includes a recovery portion, a support portion, and a filter portion.

[0047] Embodiment 1, as shown in FIGS. 1-8, a filter, the filter is a recyclable filter. The recovery part 1300 for filter recovery, the support part 1200 for preventing the filter from tilting, the filter part 1100 for capturing the plug; the recovery part 1300 and the support part 1200 and the filter part 1100 may be an integral structure, or may be divided into The body structure is assembled into a whole. In the present embodiment, the recovery portion 1300, the support portion 1200, and the filter portion 1100 of the filter have an integral structure, and are formed by heat-setting a mold by laser cutting the OD 2.0 mm nickel-titanium tube. The support portion has an axisymmetric structure and has a central axis. The support portion has a recovery portion extending in the top direction. The recovery portion is preferably located on the central axis of the support portion, preferably an axisymmetric structure, and the inclination of the filter can be reduced during the recovery process. The filter portion also extends from the support portion to the bottom portion, preferably symmetrically with respect to the central axis.

[0048] The filter portion 1100 is for capturing an emboss from the direction of blood flow, and the structure thereof has various embodiments. The filter portion 11 00 may be a strut structure or a cage structure. In the strut structure, the filter portion 1100 may be a single-layer strut structure or a multi-layer strut structure. In this embodiment, as shown in FIG. 1 , the filter part 1100 adopts a single-layer strut structure, and the single-layer strut structure uniformly sets a plurality of strut 1100a around the central axis, and the strut 110 0a has the same shape and structure, and the strut 1100a The number of the support rods 1100a is set in the embodiment. The shape of the support rods 1100a may be a straight rod or a curved shape having a certain curvature. The struts 1100 a extend outward from the center of the instrument, that is, the central axis, and the angle from the central axis of the instrument is 0 to 90°, and the specific angle of the angle is set according to actual needs.

Preferably, at the end of the strut 1100a, a barb 1110 for preventing displacement of the instrument is provided, and at least two of the strut 1100a of the filter portion 1100 are provided with a barb 1110, and the barb 1110 penetrates the vessel wall to achieve anchoring.

[0050] The support portion 1200 is the most important structure in the present invention. The first function of the support portion 1200 is to prevent the instrument from tilting, and the collection portion 1300 is prevented from adhering. The support rod 1200a is required to have a corresponding axisymmetric structure, and the support portion 1200 is supported. The support rod 1200a is included, radiated outward from the center and all of the support rods 1200a are arranged in an axisymmetric manner, and in order to reduce endothelial resuscitation, it is supported relative to the inner wall of the blood vessel. The number of the support rods 1200a of the support portion 1200 is at least three. In the present embodiment, six support rods 1200a are used, which are arranged symmetrically about the axis of the instrument.

[0051] The angle between the tangent of the end of the support rod 1200a or the end of the support rod 1200a and the central axis of the support portion is β≥180°.

The maximum outer diameter D of the support portion (the maximum outer diameter refers to the diameter of the farthest point of the support rod relative to the central axis forming a circle, D: the first boundary line with the central axis, and the farthest distance of the support rod 1200a relative to the first boundary line Point and first side The double of the distance between the boundaries) coincides with the inner diameter of the blood vessel such that the support rod 1200a is supported on the inner wall of the blood vessel. During the release process, the support rod 1200a is extended within the blood vessel, regardless of the structure of the support rod 1200a, the angle between the tangent of the end of the support rod 1200a or the end of the support rod 1200a and the central axis is β ≥ 180° after the release is completed, so that the support The end of the rod 1200a is staggered to the inner wall of the blood vessel, at least in parallel with the inner wall of the blood vessel, and the end of the support rod 1200a does not pierce the inner wall surface of the blood vessel.

[0052] According to different positions and structures of the support rods 1200a, the support rods 1200a are mainly divided into two parts, and the support rods 1200a include a first support section 1210 and a second support section 1230 which are radiated outward from the center. A transition section 1220 may also be provided between a support section 1210 and a second support section 1230. The three sections are different in structure and shape and length. The angle between the tangent of each point on the first support section 1210 or the first support section 1210 and the central axis is 01 to 0° 90°, and the tangent of each point on the second support section 1230 or the second support section 1230 The angle β with the central axis is β>90°. Similarly, since the end of the support rod 1200a is the end of the second support section 1230, the tangent of the end or end of the second support section 1230 forms an angle with the central axis β≥180. °. Such a structure can ensure that after the support rod 1200a is released, the end of the support rod 1200a is turned over and curled before the wall is attached, and the flip angle is more than 180°. The end of the first support section 1210 is assembled with the return portion 1300 and the filter portion 1100, and the second support portion 1230 is the end of the support rod 1200a.

[0053] The angle between the first support section 1210 and the second support section 1230 or the angle between the first support section and the tangent line of each point on the second support section is γ ≥ 180°, which ensures that the second support section 1230 is back. Flip in the direction of the filter, the figure shows the flip in the direction towards the top of the filter. The transition section 1220 is a transition between the first support section 1210 and the second support section 123 0 . Therefore, the length and shape of the transition section 1220 are determined according to the shapes of the first support section 1210 and the second support section 1230 to facilitate the first A smooth transition between the support section 1210 and the second support section 1230, and a corresponding flip effect. The transition section 1220 may be a curved line, a straight line, and a broken line, and a mixed arrangement of the above two or more linear shapes.

[0054] The first support segment 1210 and the second support segment 1230 are each at least one of a curved segment, a straight segment, and a polygonal segment, respectively. That is, each of the second support segments 1230 of the first support segment 1210 can be selected only as a curved segment, a straight segment or a polygonal segment, or two or even three linear shapes can be selected, and two or more linear arrangements are not used. Limited, can be any way. The same transition section 1220 can also be at least one of a curved section, a straight section, and a polygonal section. Preferably, the first support section 1210 and the second support section 1230 are curves in which the radius of curvature continuously changes, and the radius of curvature is gradually reduced. [0055] As shown in FIG. 3, the first support section 1210 is a straight section, and the transition section 1220 and the second support section 1230 are curved segments; as shown in FIG. 4, the first support section 1210, the transition section 1220, and the second support The segments 1230 are all line segments; as shown in FIG. 5, the first support segment 1210, the transition segment 1220, and the second support segment 1230 are all straight segments, and the chamfers smoothly transition between the straight segments.

As shown in FIG. 1 , in this embodiment, the first support section 1210 , the transition section 1220 , and the second support section 1230 of the support rod 1200 a are all curved segments, and the three sections of the support rod 1200 a have no clear boundary, and the third section For the continuous structure, a curve in which the radius of curvature continuously changes is formed, and the radius of curvature is gradually reduced. The lengths of the support rods 1200a are also designed according to actual needs. The angle between the tangent of each point on the first support section 1210 and the central axis is 0-90°, and the angle α can be arbitrarily selected within the range of 0-90°. The angle α is at least 0°, that is, parallel to the central axis, and the angle α is at most 90°, which is perpendicular to the central axis. The second supporting section 1230 is a section that is turned to the top. Therefore, in the free state after the release, the angle between the tangent of each point on the second supporting section 1230 or the second supporting section 1230 and the central axis is ≥ 90°, and The angle between the tangent of the end or end of the two support segments 1230 and the central axis is β≥180°; the maximum flip angle of the second support segment 1230 is reversed toward the central axis, and the end does not contact the wall of the blood vessel.

[0057] In the free state, the support portion 1200 is an axisymmetric structure, and the maximum outer diameter of the support portion 1200 is matched with the inner diameter of the blood vessel. The maximum outer diameter D of the support portion 1200 and the inner diameter of the blood vessel refer to the maximum outer diameter D of the support portion 1200. Consistent with the inner diameter of the blood vessel, D can be slightly larger than, equal to, or smaller than the inner diameter of the blood vessel. The second support section 1230 of the support rod 1200a is supported on the inner wall of the blood vessel. The point support is a relative concept, and the support rod 1200a contacts the inner wall of the blood vessel with a relatively small contact area, that is, the length and diameter of the support rod 1200a. Basically, it can be considered that contact with the inner wall of the blood vessel is a point support. The maximum outer diameter D of the support portion 1200 is 10~40mm, and the maximum diameter of the blood vessel is 2D (16~34mm interval, usually 24mm). Considering the normal size of the blood vessel, Dl<17mm and D2<8mm are preferred.

[0058] Specifically, as shown in FIG. 3, the second support section 1230 of the support bar 1200a preferably includes a first sub-section 12 30a, a second sub-section 1230b, and a third sub-section 1230c; wherein, the second support section 1230 For the curve, the radius of curvature of the second sub-section 1230b is smaller than the first sub-section 1230a, and the angle β between the second sub-section 1230b and the central axis is 90. ≤ β < 180° transition to β ≥ 180°, forming a point contact with the inner wall surface of the blood vessel; or the second sub-section 1230b is a curved line or a broken line forming a C-shape or a V-shape of the gargle toward the central axis, forming an inner wall surface of the blood vessel In the point contact, the first sub-section 1230a and the third sub-section 1230c are straight lines or broken lines, and the second support section 1230 is bent in the direction of the top of the filter. The radius of curvature of the second sub-section 1230b is the smallest, such a structure, the second sub- Paragraph 1230 The point or segment of b becomes the most distal end of the support portion 1200, i.e., the circumference on which the point or section of the second sub-section 1230b of all of the support bars 1200a is located forms the maximum circumference of the support portion 1200, and the position of the second sub-section 1230b becomes The position in contact with the inner wall of the blood vessel.

[0059] Although the first support section 1210, the transition section 1220, and the second support section 1230 divide the support rod 1200a into three parts, the support rod 1200a is a unitary body, and thus the first support section 1210, the transition section 1220, and the second support Segments 1230 each have a smooth transition and a smooth transition therebetween to achieve the formation of a complete support rod 1200a.

6-8 is a schematic diagram of a release process of the support portion. As shown in FIG. 6, the second support section 1230 of the support rod 1200a is swung out from the duct 1600. As shown in FIG. 7, the support rod 1200a is halfway, and the transition section 1220 is gradually extended, with the support rod 1200a being extended.第三, the third support section 1230 at the end of the support rod 1200a starts to bend toward the top of the filter. As shown in FIG. 7, this state is the most dangerous state in the release process, and the end of the support rod 1200a faces the blood vessel wall 1800, if the support rod 1200a passes If the length of the support rod 1200a is insufficient, the end of the support rod 1200a will pierce the blood vessel. Therefore, the shape of the support rod 1200a in the free state is required to satisfy: D 2 < half of the inner diameter of the blood vessel, and D1 < half of the inner diameter of the blood vessel; Wherein, D1: a tangent line at the end of the support rod 1200a as a second boundary line, a distance between the farthest point of the support rod 1200a relative to the second boundary line and the second boundary line; D2: to pass through the end of the support rod 1200a and The straight line perpendicular to the second boundary line is the third boundary line, and the distance of the support rod 1200a with respect to the outermost point of the outer side of the third boundary line. According to the above requirements, the support rod 1200a does not pierce the inner wall surface 1800 of the blood vessel during the release of the stent. As shown in Fig. 8, the delivery catheter 1600 is retracted, and the first support section 1210 of the support portion 1200 is swollen, and the end of the support rod 1200a is bent toward the central axis before the wall of the blood vessel 1800 is attached, so that the inner wall surface of the blood vessel 1800 is not pierced. The second sub-section 1230b of the second support section 1230 of the support rod 1200a is adhered to the inner wall of the blood vessel 1800, and then the recovery portion 1300 is released from the delivery catheter. Under the action of the support portion 1200, the filter 1000 is less prone to tilting, and the recovery portion 1300 is difficult to adhere to the wall, so that the device is more easily recovered. Similarly, the filter and the blood vessel wall are mainly in point contact non-surface contact, which can effectively reduce the endothelium. Climb, reduce filter recovery time.

[0061] The recovery unit 1300 is used for filter recovery, and the recovery unit 1300 is disposed at the top center of the support portion 1200, and has a body structure with the support portion 1200. The recycling portion 1300 includes a hook 1310 or a loop for hooking back into the delivery catheter. [0062] Embodiment 2 As shown in FIGS. 9 and 10, in the present embodiment, on the basis of Embodiment 1, an anchor rib 1231 for limiting penetration of the blood vessel 1800 is provided at the end of the support rod 1200a of the support portion 1200. The support portion 1200 is a smooth screw rod, in order to further prevent the support rod 1200a from penetrating into the wall surface of the blood vessel 1800, and causing the penetration to be too deep, piercing the wall surface of the blood vessel 1800, causing damage to the blood vessel 1800 or difficult to recover the instrument, the second support in this embodiment The end of the segment 1 230 is provided with an anchor 1231 such that the end 1232 of the second support segment 1230 forms two branches together with the anchor 1231. Due to the formation of the bifurcation, when the support portion 1200 releases the ankle, the anchor 1231 is used for stabbing. The wall of the blood vessel 1800 is inserted to realize the anchoring of the instrument to prevent displacement. The end 1232 of the second support section 1230 defines the anchor thorn 1231 to prevent the penetration from being too deep.

[0063] The rest of the structure is the same as Embodiment 1, and details are not described herein again.

[0064] Embodiment 3, as shown in FIGS. 11 and 12, this embodiment is based on Embodiment 1, and the third sub-section 1230c of the second support section 1230 has a smaller radius of curvature than the second sub-section 1230b. In this way, when the support portion 1200 gradually releases the abutment and adheres to the wall, the second support portion 1230 has returned to the curved state, so that the head end of the support portion 1200 does not penetrate the blood vessel wall, thereby preventing the support portion 1200 from damaging the blood vessel. risk.

[0065] The rest of the structure is the same as Embodiment 1, and details are not described herein again.

[0066] Embodiment 4, as shown in FIGS. 13 and 14, the structure of this embodiment is the same as that of Embodiment 1-3, and the respective portions of the filter are a separate structure, the support rod 1200a of the support portion 1200 and the filter rod of the filter portion 1100. The 1100a is a filament-like structure, and is fixedly coupled to the recovery portion 1300 through the ferrule 1260.

[0067] The support portion 1200 is formed by using a wire of 0.1 to 0.6 mm, and the wire material includes, but is not limited to, one or more of stainless steel, nickel titanium alloy, cobalt chromium alloy, titanium alloy, and the like. In this embodiment, the support portion 1200 is composed of six support rods 1200a made of 0.35 mm nickel-titanium wire, and the support rod 1200a is sleeved on the end sleeve 1260, and then connected by argon arc welding, and then heat-shaped through the mold to form a continuous smooth bending. Support rod 1200a.

[0068] The filter portion 1100 in the present embodiment is formed by heat setting after laser cutting. The filter portion 11 00, the support portion 1200, and the recovery portion 1300 in this embodiment are separately molded and then welded together, and the support portion 1200 is located inside the filter portion 1100.

[0069] Embodiment 5 This embodiment has the same support portion 1200 and recovery portion 1300 as in Embodiment 4. The difference is that the struts 1100a of the filter portion 1100 in the present example are also formed by using 0. l~0.6mm wire materials, including but not limited to stainless steel, nickel titanium alloy, cobalt chrome alloy, titanium alloy, etc. One or more of them. The filter portion 1100 and the support portion 1200 may be separately formed by welding, or may be integrally molded. This implementation In the example, the filter portion 1100 is composed of 12 struts 1100a made of 0.40 mm nickel-titanium wire, and the support portion 1200 is composed of 6 support rods 1200a made of 0 35 mm nickel-titanium wire, and then the sleeve 1260 is sheathed by argon arc welding. It is connected with laser spot welding and finally heat-set by mold.

[0070] Embodiment 6, as shown in FIG. 6 is a specific implant example: In the prior art, the vena cava filter is generally implanted under the renal artery. In this embodiment, the filter is inserted across the renal artery to increase the filter. Anchor zone, expand the range of use of the filter. The rod 1100a of the filter portion 1100 is formed by using a wire of 0.1 to 0.6 mm, and the wire includes, but is not limited to, one or more of stainless steel, nickel titanium alloy, cobalt chromium alloy, titanium alloy, and the like. The filter portion 1100 and the support portion 1200 may be separately formed by welding, or may be integrally molded. The struts 1100a of the specific filter portion 1100 are formed by argon arc welding of 12 0.40 mm nickel-titanium wires, and the mold is heat-set. Since the filter portion 1100 is composed of a nickel-titanium wire in a straight section, the wire and the wire are relatively high. The degree of freedom has better flexibility. The support rod 1200a of the support portion 1200 is laser-cut with a 2.70 mm nickel-titanium tube, and the mold is heat-set. The filter portion 1100, the support portion 1200, and the recovery portion 1300 are connected by laser spot welding, one of which is shown in Fig. 15, wherein the filter portion 1100 is located below the renal artery 2100 and the renal artery 2200, and the support portion 1200 and the recovery portion 1300 are in the renal artery. 2100 and 2 renal arteries above 200.

[0071] Example 7, as shown in Fig. 16, is a permanent filter. Only the support portion 1200 and the filter portion 1100 are included. In the free state, the support portion 1200 includes at least three support rods 1200a radiated outward from the center and all the support rods 1200a are arranged in an axisymmetric manner, and there are four in this embodiment. The support rod 1200a; the structure of the support rod 1200a is the same as that of the embodiment 1, and details are not described herein again. The tangential line of the end of the support rod 1200a or the end of the support rod 1200a is at an angle β ≥ 180° with the central axis of the support portion, and the maximum outer diameter of the support portion is matched with the inner diameter of the blood vessel such that the support rod 1200a is supported on the inner wall of the blood vessel. . The difference from the first embodiment is the turning direction of the support rod 1200a. In this embodiment, the support rod 1200a is turned in the direction of the filter portion 1100 to form a support. The structure of the filter portion 1100 is the same as that of the first embodiment.

Claims

Claim

A filter comprising a support portion for preventing tilting of the filter, and a filter portion for capturing the plug; characterized in that:

In the free state, the support portion includes at least three support rods radiated outward from the center and all of the support rods are arranged in an axisymmetric manner;

The tangential line of the end of the support rod or the end of the support rod is at an angle β ≥ 180° with the central axis of the support portion, and the maximum outer diameter of the support portion is matched with the inner diameter of the blood vessel such that the support rod point is supported on the inner wall of the blood vessel.

The filter according to claim 1, wherein each of said support rods comprises a first support section and a second support section radiated outward from the center;

An angle α between a tangent line of each point on the first support section or the first support section and a central axis of the support part is 0-90°, and a tangent line and a central axis of each point on the second support section or the second support section are clamped The angle β ≥ 90°, and the angle between the tangent of the end or end of the second support section and the central axis β ≥ 180°; the angle between the first support section and the second support section or the first support section and the second support The angle of the tangent of each point on the segment is γ ≥ 180°; the second support segment of the support rod is supported on the inner wall of the blood vessel. The filter according to claim 2, wherein the shape of the support rod in a free state satisfies: D2 < half of the inner diameter of the blood vessel, and D1 < half of the inner diameter of the blood vessel, D1: the tangent at the end of the support rod a boundary line, a distance between a farthest point of the support rod relative to the second boundary line and a second boundary line; D2: a third boundary line passing through a line passing through the end of the support rod and perpendicular to the second boundary line, the support rod is opposite The distance from the farthest point on the outer side of the third boundary line.

The filter according to claim 3, wherein the filter according to any one of claims 2 to 4, wherein the first support section and the second support are The segments are each at least one of a curved segment, a straight segment, and a polygonal segment. The filter according to claim 5, wherein the first support section and the second support section are curves in which the radius of curvature continuously changes, and the radius of curvature is gradually reduced.

A filter according to any one of claims 2 to 4, wherein the support rod The second support section includes a first subsection, a second subsection, and a third subsection;

Wherein, the radius of curvature of the second sub-segment is smaller than the first sub-segment, and the angle β between the second sub-segment and the central axis transitions from 90° ≤ β < 180° to β ≥ 180°, forming a point contact with the inner wall surface of the blood vessel Or the second sub-section is a curve or a broken line, forming a c-shaped or V-shaped structure with the cornice facing the central axis, the second sub-section forming a point contact with the inner wall surface of the blood vessel, and the first sub-section and the third sub-section are straight lines or broken lines And the second support section is entirely curved away from the filter portion or toward the filter portion.

[Claim 8] The filter according to any one of claims 1 to 4, wherein the end of the support rod is provided with an anchor for limited penetration into a blood vessel.

[Claim 9] The filter according to any one of claims 1 to 4, wherein the filter portion is a strut structure, or the filter portion is a cage structure.

[Claim 10] The filter according to claim 1, wherein the filter is further provided with a recovery portion for recovering the entire filter.