CN110882090A

CN110882090A - Recoverable vena cava filter

Info

Publication number: CN110882090A
Application number: CN201911325537.4A
Authority: CN
Inventors: 刘恒全; 刘忍; 潘长江; 李林; 刘尧灏
Original assignee: Chengdu Maideke Technology Co Ltd
Current assignee: Chengdu Maideke Technology Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-03-17

Abstract

The invention discloses a recyclable vena cava filter, which comprises a filtering part for filtering thrombus and a supporting part for fixing the filter, wherein the filtering part comprises a first filtering part and a second filtering part which are arranged along a vein, the first filtering part and the second filtering part are in central symmetry structures, and the first filtering part and the second filtering part are connected through a connecting part; the supporting part comprises a first supporting part and a second supporting part, the first supporting part is arranged at the tail end of the first filtering part, and the second supporting part is arranged at the middle section part of the second filtering part. The invention relates to a recyclable vena cava filter which has good geometric stability, long recycling period and directional recycling or releasing. The geometric stability of filter has been improved when improving thrombus filter effect, has reduced the slope and the aversion of filter, and both sides filter house adopts asymmetric design, has improved thrombus filter effect, and filter respectively adopts curling and the design of arc anchor, has reduced the damage of apparatus to the vascular wall.

Description

Recoverable vena cava filter

Technical Field

The invention relates to the technical field of medical instruments, in particular to a recyclable vena cava filter.

Background

Embolisms are pathological and clinical conditions caused by deep venous thrombi in the lower limbs or pelvis entering the pulmonary artery and its branches, blocking the tissue blood supply. With the improvement of living standard and the increase of accidents, the incidence rate of pulmonary embolism tends to rise year by year. The annual incidence rate of the deep venous thrombosis of the lower limbs of the general population in western countries reported in the literature is between 0.05 and 0.1 percent, and about 3000 ten thousand cases of patients with the deep venous thrombosis and sequelae of the lower limbs in China exist. Because of the potential danger of fatal pulmonary embolism caused by thrombus shedding, the filter is difficult to be clinically treated, and the application of the inferior vena cava filter can not only effectively prevent the occurrence of pulmonary embolism, but also ensure that thrombolysis and surgical treatment are safer.

The vena cava filter is mostly formed by weaving nickel-titanium alloy wires and carving nickel-titanium pipes, the former has the problems of low welding point strength and small radial supporting force, and the latter is a manufacturing mode selected by most manufacturers. The recyclable vena cava filter is released by intervention on a percutaneous puncture catheter or a guide wire, and is taken out after a certain time, and the filter is taken out conveniently. The recyclable vena cava filter can be used for recycling the filter in vivo through jugular vein or femoral vein by using a special recycling system through an interventional method, and has the advantages of small wound and few complications.

The existing vena cava filter has the following problems:

1. there exists a cage-shaped closed structure filter, such as the vena cava filter described in chinese patent No. CN201420865062.4, entitled vena cava filter assembly for easy removal, which has good geometric stability but short recovery period;

2. there is a recoverable filter, such as the vena cava filter described in chinese patent No. CN201310442071.2, entitled vena cava filter, which has a long recovery period, but has poor geometric stability, is easy to incline or shift, and results in a decrease in thrombus capture efficiency, even a failure in thrombus filtration;

3. the filter with a conical structure is implanted in a vena cava to filter thrombus like a funnel, and the opening of the funnel can only face the blood flow to effectively intercept the thrombus, so the filter can only be recovered or released in a one-way manner, has poor adaptability to patients with special pathological changes, causes difficult clinical operation of doctors, and is easy to fail to recover or be taken out through surgical operation when a recovery device cannot capture the thrombus;

4. the existing vena cava filter fixing anchor plays a role in fixing, but simultaneously damages the blood vessel wall and is easy to cause other complications.

Disclosure of Invention

The present invention is directed to solving the above problems by providing a recyclable vena cava filter which has good geometric stability, a long recycling period, and directional recycling or release.

In order to achieve the above object, the present invention provides a recyclable vena cava filter, comprising a filter part for filtering thrombus and a support part for fixing the filter, wherein the filter part comprises a first filter part and a second filter part arranged along a vein, the first filter part and the second filter part are both in a centrosymmetric structure, and the first filter part and the second filter part are connected through a connecting part;

the supporting part is including being used for supporting first supporting part of first filter house on the vascular wall and being used for supporting the second supporting part of second filter house on the vascular wall, and first supporting part sets up in the end of first filter house, and the second supporting part sets up in the middle-section portion of second filter house.

Preferably, the first filter part and the second filter part are each formed in an open structure.

Preferably, the first filter part comprises at least three first filter members, each of which extends outwards from the axis of the first filter part and is gradually bent inwards;

the second filter part comprises at least three second filter parts, and each second filter part extends outwards from the axis of the second filter part and is gradually bent outwards.

Preferably, the first support part is formed as a fixation anchor for anchoring on the inner wall of the blood vessel, the fixation anchor being fixed to the first filter element end.

Preferably, the second support part is formed by bending the inner side of the middle section of the second filter member.

Preferably, the cross-sectional area of the first filter member is equal to/larger than the cross-sectional area of the second filter member.

Preferably the first and second filter members are axially staggered.

Preferably, the connecting part is formed into a tubular structure, the connecting part is positioned at the axial centers of the first filtering part and the second filtering part, and the first filtering part, the second filtering part and the connecting part are of an integrally molded structure.

Preferably, the recoverable vena cava filter further comprises a recovery part, the recovery part penetrates through the connecting part, recovery hooks are arranged at two ends of the recovery part, and the recovery hooks at the two ends are respectively located at the axle centers of the first filtering part and the second filtering part.

Preferably, the length of the second filter portion is one-half of the length of the first filter portion.

The invention has the beneficial effects that:

1. the first filter part and the second filter part are both formed into open recoverable structures, so that the geometric stability of the filter is improved while the thrombus filtering effect is improved, and the inclination and the displacement of the filter are reduced;

2. the first filtering part and the second filtering part are arranged along the vein, and the thrombus filtering effect is improved by adopting an asymmetric design;

3. the recycling devices are arranged at the axle centers of the first filtering part and the second filtering part, so that bidirectional recycling or releasing can be realized;

4. the support part adopts a design of a fixing anchor which is curled or curved, so that the damage of the instrument to the vessel wall is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a three-dimensional view of the recyclable vena cava filter of the present invention, wherein a is a front view thereof, B is a side view thereof, and C is a top view thereof.

Description of the reference numerals

1-a first supporting part, 2-a first filtering part, 3-a connecting part, 4-a second filtering part, 5-a second supporting part and 6-a recovering part.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the terms of orientation such as "inside" and "outside" are generally defined based on the orientation or positional relationship shown in the drawings, and specifically refer to the direction of the drawing shown in fig. 1 in combination with the positional relationship of the corresponding parts in other drawings. Furthermore, the terms "first," "second," and the like, as used in this disclosure, are intended to distinguish one element from another, without order or priority. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

The invention relates to a recyclable vena cava filter, which comprises a filtering part for filtering thrombus and a supporting part for fixing the filter, wherein the filtering part comprises a first filtering part 2 and a second filtering part 4 which are arranged along a vein, the first filtering part 2 and the second filtering part 4 are both in central symmetry structures, and the first filtering part 2 and the second filtering part 4 are connected through a connecting part 3;

the supporting part comprises a first supporting part 1 used for supporting the first filtering part 2 on the blood vessel wall and a second supporting part 5 used for supporting the second filtering part 4 on the blood vessel wall, the first supporting part 1 is arranged at the tail end of the first filtering part 2, and the second supporting part 5 is arranged at the middle section part of the second filtering part 4.

The first filtering part 2 and the second filtering part 4 both adopt a central symmetry structure, and the first filtering part 2 and the second filtering part 4 are respectively provided with the first supporting part 1 and the second supporting part 5 to be fixed with the vessel wall, so that the invention has better geometric stability and prevents the filter from inclining.

The invention arranges double filtering parts along the vein, and the filter can achieve the ideal thrombus filtering effect no matter the first filtering part 2 faces the blood flow direction or the second filtering part 4.

The invention provides the first supporting part 1 and the second supporting part 5 for the filter, and the first supporting part 1 and the second supporting part 5 disperse the acting force applied to the filter, reduce the acting force of the connecting point of the supporting parts and the blood vessel wall, thereby reducing the damage of the apparatus to the blood vessel wall.

Alternatively, the first filter part 2 and the second filter part 4 are each formed in an open structure.

Optionally, the first filter part 2 comprises at least three first filter members, each of which extends outwards from the axis of the first filter part 2 and is gradually bent inwards;

the second filter portion 4 includes at least three second filter members, each of which extends outward from the axis of the second filter portion 4 and is gradually bent outward.

Alternatively, the first support 1 is formed as a fixation anchor for anchoring on the inner wall of the vessel, the fixation anchor being fixed to the first filter element end.

Optionally, the second support 5 is formed by a mid-section inside bend of the second filter.

Specifically, the medial bend of the second filter element is supported on the vessel wall.

Optionally, the cross-sectional area of the first filter element is equal to/larger than the cross-sectional area of the second filter element.

Optionally, the first and second filter members are axially staggered.

Alternatively, the connecting portion 3 is formed in a tubular structure, the connecting portion 3 is located at the axial center of the first filter portion 2 and the second filter portion 4, and the first filter portion 2, the second filter portion 4 and the connecting portion 3 are of an integrally molded structure.

Specifically, a pipe is divided into n filter pieces by two sections at two ends, the filter pieces are bent and formed, and the pipe section which is not divided is formed into the connecting part 3.

Optionally, the recoverable vena cava filter further comprises a recovery part 6, the recovery part 6 penetrates through the connecting part 3, and recovery hooks are arranged at two ends of the recovery part 6, and the recovery hooks at the two ends are respectively located at the axle centers of the first filtering part 2 and the second filtering part 4.

The recycling portion 6 is specifically formed as a section of solid rod, the solid rod penetrates through the connecting portion 3 and is welded with the connecting portion 3, two ends of the solid rod are respectively located at the axle centers of the first filtering portion 2 and the second filtering portion 4, or two ends of the solid rod are bent to form a recycling hook, or a groove is obliquely arranged on the solid rod close to the two ends to form the recycling hook.

Optionally, the length of the second filter house 4 is one half of the length of the first filter house 2.

Example 1, as shown in figure 1:

the first filter part 2 is formed by extending six first filter pieces outwards from the axis and bending inwards gradually, the radius R2 of the extending section is 1 mm-30 mmmm, a fixed anchor anchored on the inner wall of the blood vessel is fixed at the tail end of the first filter piece, the fixed anchor of the first support part 1 is bent outwards, and the bending radius R1 is 0.1 mm-5 mm.

The second filter part 4 is formed by extending outwards from the axis of the second filter part 4 by six second filter members and gradually bending outwards, the radius R3 of the extending section is 1 mm-30 mm, the radius R4 of the bending section is 0.5 mm-18 mm, and the second support part 5 is formed by the bending part at the inner side of the middle section of the second filter member.

The first filter piece and the second filter piece are axially arranged correspondingly.

Example 2:

the present embodiment is different from embodiment 1 in that: the second filter element has a length equal to the length of the first filter element.

Example 3:

this embodiment is different from embodiments 1 and 2 in that: the length of the second filter member is one-half of the length of the first filter member.

Example 4:

the present embodiment is different from embodiment 1 in that: the cross-sectional area of the first filter member is larger than the cross-sectional area of the second filter member.

Example 5:

this embodiment is different from embodiments 1 and 4 in that: the cross-sectional area of the first filter member is larger than the cross-sectional area of the second filter member.

Example 6

The present embodiment is different from embodiment 1 in that: the first filter piece and the second filter piece are arranged in an axially staggered mode.

The open type recyclable vena cava filter has good geometric stability, long recycling period and directional recycling or releasing.

The structure of the filter consists of two open filter baskets, the geometric stability of the filter is improved while the thrombus filtering effect is improved, the inclination and the displacement of the filter are reduced, and the filter can achieve an ideal thrombus filtering effect no matter the first filter part 2 faces the blood flow direction or the second filter part 4;

the two ends of the axis of the filter are provided with recovery devices which can be recovered or released in two directions;

the filter basket adopts asymmetric design, has improved thrombus filter effect, filters the piece and respectively adopts curling and the design of arc anchor respectively, has reduced the damage of apparatus to the vascular wall.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. Recoverable vena cava filter, including the filter house that is used for filtering the thrombus and the supporting part that is used for fixed filter, its characterized in that: the filter part comprises a first filter part and a second filter part which are arranged along the vein, the first filter part and the second filter part are both in centrosymmetric structures, and the first filter part and the second filter part are connected through a connecting part;

2. The retrievable vena cava filter according to claim 1, wherein: the first filter part and the second filter part are formed in an open structure.

3. The retrievable vena cava filter according to claim 2, wherein: the first filter part comprises at least three first filter parts, and each first filter part extends outwards from the axis of the first filter part and is gradually bent inwards;

4. The retrievable vena cava filter according to claim 3, wherein: the first support part is formed as a fixation anchor for anchoring on the inner wall of the blood vessel, the fixation anchor being fixed to the first filter element end.

5. The retrievable vena cava filter according to claim 3, wherein: the second supporting part is formed by the bending part at the inner side of the middle section of the second filter piece.

6. The retrievable vena cava filter according to claim 3, wherein: the cross-sectional area of the first filter member is equal to/larger than the cross-sectional area of the second filter member.

7. The retrievable vena cava filter according to claim 3, wherein: the first filter piece and the second filter piece are arranged in an axially staggered mode.

8. The retrievable vena cava filter according to claim 3, wherein: the connecting part is formed into a tubular structure, the connecting part is positioned at the axle center of the first filtering part and the second filtering part, and the first filtering part, the second filtering part and the connecting part are of an integrally formed structure.

9. The retrievable vena cava filter according to claim 8, wherein: recoverable vena cava filter still includes the recovery unit, and connecting portion are worn to establish by the recovery unit, and the recovery unit both ends all are provided with retrieves the hook, and the recovery hook at both ends is located the axle center department of first filter house and second filter house respectively.

10. The retrievable vena cava filter according to claim 1, wherein: the length of the second filter part is one half of the length of the first filter part.