CN211934424U

CN211934424U - Vena cava filter

Info

Publication number: CN211934424U
Application number: CN201922127703.1U
Authority: CN
Inventors: 张荣利; 雷震; 黄文和; 李超
Original assignee: Beijing Ailin Medical Technology Co ltd
Current assignee: Beijing Ailin Medical Technology Co.,Ltd.
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-11-17
Anticipated expiration: 2029-12-02

Abstract

The utility model relates to the technical field of medical equipment, in particular to vena cava filter. The utility model provides a vena cava filter, include: the filter screen is used for filtering thrombus and is used for retrieving the recovery hook of filter screen, the filter screen sets up to polygon network structure, retrieve the hook with the filter screen is connected. The vena cava filter comprises a recovery hook, so that the vena cava filter can be recovered conveniently, the recoverable vena cava filter can avoid the danger that a permanent vena cava filter is left in a blood vessel for a long time, and is beneficial to patients who are not suitable for leaving the inferior vena cava filter for a long time, meanwhile, the filter screen is arranged to be of a polygonal net structure, so that the filter screen can be integrally contracted or extended, can be contracted when being placed into the blood vessel or taken out from the blood vessel conveniently, can be extended in the blood vessel conveniently, is suitable for the inner cavity of the blood vessel, avoids the damage to the inner wall of the blood vessel when being recovered, and is convenient to.

Description

Vena cava filter

Technical Field

The utility model relates to the technical field of medical equipment, in particular to vena cava filter.

Background

Pulmonary artery embolism refers to the clinical and pathophysiological syndrome of pulmonary circulatory disturbance caused by endogenous or exogenous emboli blocking pulmonary artery or branches thereof. The most important and common kind of the pulmonary thromboembolism is pulmonary arterial thromboembolism, and other types of pulmonary thromboembolic emboli as etiological factors, such as fat embolism, amniotic fluid embolism, air embolism, foreign body embolism and tumor embolism, are also included. Pulmonary infarction is called if pulmonary hemorrhage or necrosis occurs after pulmonary embolism. Originating in situ in the pulmonary artery is called pulmonary artery thrombosis.

The traditional vena cava filter in the current market has the problems that the position is moved after being placed in a blood vessel, the recovery is difficult, the injury of the inner wall of the blood vessel is easily caused during the recovery, the thrombus is not completely collected, the thrombus is left, the hyperplasia and the coverage of the blood vessel inner membrane are easily caused, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vena cava filter, vena cava filter can solve above-mentioned technical problem effectively.

The utility model provides a vena cava filter, include: the filter screen is used for filtering thrombus and is used for retrieving the recovery hook of filter screen, the filter screen sets up to polygon network structure, retrieve the hook with the filter screen is connected.

In one embodiment, the filter screen is integrally provided as a closed screen tubular structure.

In one embodiment, the vena cava filter includes a first retrieval hook and a second retrieval hook, the first retrieval hook and the second retrieval hook being disposed at opposite ends of the filter screen, respectively.

In one embodiment, the filter screen is made of a medical metal material.

In one embodiment, the vena cava filter further comprises a covering membrane sleeved on the peripheral side wall of the filter screen.

In one embodiment, the cover membrane is a PTFE membrane.

In one embodiment, the vena cava filter further comprises a positioning barb.

In one embodiment, the filter screen further comprises at least one auxiliary filter screen inside the filter screen.

In one embodiment, the filter screen is provided as a screen cylinder structure, the filter screen has a first end provided in a closed configuration and a second end provided in an open configuration, and the recovery hook is provided as a bi-directional recovery hook connected to the first end.

In one embodiment, the vena cava filter comprises two filter screens, wherein the first ends of the two filter screens are connected, and the bidirectional recovery hook is arranged at the joint of the two filter screens.

The utility model provides a pair of vena cava filter compares with prior art, possesses following beneficial effect at least:

the utility model provides a vena cava filter, include: the filter screen is used for filtering thrombus and is used for retrieving the recovery hook of filter screen, the filter screen sets up to polygon network structure, retrieve the hook with the filter screen is connected. The vena cava filter comprises a recovery hook, so that the vena cava filter can be recovered conveniently, the recoverable vena cava filter can avoid the danger that a permanent vena cava filter is left in a blood vessel for a long time, and is beneficial to patients who are not suitable for leaving the inferior vena cava filter for a long time, meanwhile, the filter screen is arranged to be of a polygonal net structure, so that the filter screen can be integrally contracted or extended, can be contracted when being placed into the blood vessel or taken out from the blood vessel conveniently, can be extended in the blood vessel conveniently, is suitable for the inner cavity of the blood vessel, avoids the damage to the inner wall of the blood vessel when being recovered, and is convenient to.

Drawings

The present invention will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a first vena cava filter according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a first vena cava filter cover provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second vena cava filter provided in accordance with an embodiment of the present invention;

fig. 4 is a schematic structural view of a second vena cava filter cover provided in an embodiment of the present invention;

fig. 5 is a schematic structural view of a third vena cava filter provided in accordance with an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a third vena cava filter cover provided in an embodiment of the present invention with a cover membrane;

fig. 7 is a schematic structural view of a fourth vena cava filter provided in accordance with an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a fourth vena cava filter cover provided in an embodiment of the present invention and having a cover membrane.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Reference numerals:

10-vena cava filter; 11-a filter screen; 111-a first filter layer; 113-a second filter layer; 115-a first end;

116-a second end; 12-auxiliary filter screen; 13-recovery hook; 131-a first recovery hook; 133-a second recovery hook;

135-bidirectional recovery hook; 15-coating a film; 17-positioning the barbs.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1, the present invention provides a vena cava filter 10, comprising: the thrombus filter comprises a filter screen 11 and a recovery hook 13, wherein the filter screen 11 is used for filtering thrombus, the recovery hook 13 is used for recovering the filter screen 11, the filter screen 11 is of a polygonal net structure, and the recovery hook 13 is connected with the filter screen 11.

The utility model provides a vena cava filter 10, include: the thrombus filter comprises a filter screen 11 and a recovery hook 13, wherein the filter screen 11 is used for filtering thrombus, the recovery hook 13 is used for recovering the filter screen 11, the filter screen 11 is of a polygonal net structure, and the recovery hook 13 is connected with the filter screen 11. The vena cava filter 10 comprises the recovery hook 13, so that the vena cava filter 10 can be conveniently recovered, the recoverable vena cava filter 10 can avoid the danger that the permanent vena cava filter 10 is kept in a blood vessel for a long time, and is beneficial to patients who are not suitable for keeping the vena cava filter 10 in a long time, meanwhile, the filter screen 11 is of a polygonal net structure, so that the filter screen 11 is convenient to shrink or stretch integrally, is convenient to shrink when being placed into the blood vessel or taken out from the blood vessel, is convenient to stretch in the blood vessel, is suitable for the inner cavity of the blood vessel, avoids the injury of the inner wall of the blood vessel when being recovered, and is convenient to recover.

Referring to fig. 1 in conjunction with fig. 2, in an example, the filter screen 11 is integrally configured as a closed-screen cylindrical structure. Set up filter screen 11 to closed net tubular structure, it has double-deck filter effect that also to be possessed by filter screen 11, also is filter screen 11 including first filter layer 111 and second filter layer 113 for the thrombus passes through first filter layer 111 and second filter layer 113, improves collection and the rate of recovery of vena cava filter 10 to the thrombus.

It should be noted that, the specific structure of the filter screen 11 is not limited herein, and it should be understood that, in other specific embodiments, one end of the filter screen 11 may be open and the other end may be closed according to the requirement of a user.

It should be further noted that the filter screen 11 is configured as a screen cylinder structure, specifically, in this embodiment, the filter screen 11 is configured as a cylinder structure, so that the vena cava filter 10 is easier to adhere to the wall, and has strong radial support force, and can support the stenotic part of the blood vessel.

Specifically, in one embodiment, the filter screen 11 is a polygonal mesh structure, and the filter screen 11 is a polygonal mesh structure, so that the filter screen 11 can be further conveniently contracted or extended, can be conveniently contracted when being placed into or taken out of a blood vessel, can be conveniently extended in the blood vessel, is suitable for a blood vessel inner cavity, can avoid damage to the inner wall of the blood vessel when being recovered, and can be conveniently recovered and avoid damage to the inner wall of the blood vessel when being recovered.

Specifically, in the present embodiment, the diameter of the cylindrical filter screen 11 is 22mm to 28 mm. Specifically, in the present embodiment, the diameter of the filter screen 11 is set to 25 mm. It should be noted that the diameter of the filter screen 11 is not limited here, and it is understood that in other specific embodiments, the diameter of the filter screen 11 may be set to 23mm, 24mm, 26mm, or the like according to the requirement of the user.

In one embodiment, the vena cava filter 10 includes a first recovery hook 131 and a second recovery hook 133, and the first recovery hook 131 and the second recovery hook 133 are respectively disposed at opposite ends of the filter mesh 11. In the present embodiment, two recovery hooks 13 are provided, so that bidirectional recovery can be effectively achieved, that is, the filter screen 11 can be hooked out and recovered from both ends. It should be noted that the specific number of the recovery hooks 13 is not limited, and it is understood that in other embodiments, the vena cava filter 10 may be configured to include one recovery hook 13 according to the user's requirement.

In one embodiment, the filter screen 11 is made of a medical metal material. Specifically, in this embodiment, the filter screen 11 is made of a nitinol wire material. The filter screen 11 is made of nickel-titanium alloy wire materials, so that the structure is stable, the corrosion resistance is high, and the filter screen is not easy to break. It should be noted that, the specific material of the filter screen 11 is not limited herein, and it is understood that, in other specific embodiments, the filter screen 11 may be made of other materials according to the needs of the user. Specifically, in this embodiment, the filter screen 11 is formed by hand knitting.

Specifically, in one embodiment, the filter screen 11 is a conical closed structure in the shape of a screen cylinder, and since the end of the filter screen 11 is conical, the filter screen 11 can be conveniently placed into or taken out of a blood vessel.

In one embodiment, the vena cava filter 10 further includes a covering film 15 covering the peripheral side wall of the filter screen 11, that is, the covering film 15 covers the peripheral side wall of the filter screen 11, and the covering films 15 are not disposed on the filter portions at the two ends of the filter screen 11. The covering membrane 15 is provided to prevent the intimal hyperplasia of blood vessels from covering, specifically, in this embodiment, the covering membrane 15 is a PTFE membrane, which needs to be described, and here, the specific material of the covering membrane 15 is not limited, it can be understood that, in other specific embodiments, the covering membrane 15 may be made of other medical materials according to the needs of the user.

In one embodiment, the vena cava filter 10 further comprises positioning barbs 17. The positioning barbs 17 are provided to effectively prevent displacement of the vena cava filter 10 after placement in a blood vessel.

Referring to fig. 3 in combination with fig. 4, in an embodiment, the filter screen 11 further includes at least one auxiliary filter screen 12 inside. The inner side of the filter screen 11 also comprises at least one auxiliary filter screen 12, and the number of the auxiliary filter screens 12 and the filtering function can be effectively set according to the requirements of users. Specifically, in this embodiment, filter screen 11 inboard still includes supplementary filter screen 12, supplementary filter screen 12 is the same with filter screen 11 shape, and the size of supplementary filter screen 12 is less than filter screen 11's size for the thrombus filters through four times, and the efficiency of letting collect the thrombus is higher, and the effect of filtering the thrombus strengthens, and simultaneously, has also strengthened the holding power of filter somatic part, has supported the narrow position of blood vessel more easily.

Referring to fig. 5 in combination with fig. 6, in an example, the filter screen 11 is configured as a screen cylinder structure, the filter screen 11 has a first end 115 configured to be closed and a second end 116 configured to be opened, and the recovery hook 13 is configured as a bidirectional recovery hook 135 connected to the first end 115. The bidirectional recovery hook 135 can realize bidirectional recovery, one recovery hook 13 is provided with two recovery ends which can be pulled by the recoverer, one end of the recovery end is arranged outside the filter screen 11, and the other end of the recovery end is arranged inside the filter screen 11, so that bidirectional recovery of jugular veins and femoral veins can be realized. Will filter screen 11 sets up to semi-enclosed structure, can realize the upset recovery from top to bottom when retrieving vena cava filter 10, makes to retrieve more portably, more nimble.

Referring to fig. 7 in conjunction with fig. 8, in one example, the vena cava filter 10 includes two filter meshes 11, the first ends 115 are connected, and the bi-directional recovery hook 135 is disposed at the connection of the two filter meshes 11. That is, the upper end of the bidirectional recovery hook is used for recovering the hook part and weaving a section of cylindrical filter screen 11 structure, thereby realizing double-layer filtration, improving the thrombus filtering effect of the vena cava filter 10 and further realizing the bidirectional recovery and bidirectional filtration effects.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A vena cava filter, comprising:

the filter screen (11) is used for filtering thrombus, and the filter screen (11) is of a polygonal net structure; and

the recovery hook (13) is used for recovering the filter screen (11), and the recovery hook (13) is connected with the filter screen (11);

the vena cava filter (10) further comprises a coating film (15) sleeved on the peripheral side wall of the filter screen (11).

2. Vena cava filter according to claim 1, characterized in that the filter mesh (11) is integrally provided as a closed mesh cartridge-like structure.

3. The vena cava filter according to claim 2, characterized in that the vena cava filter (10) comprises a first recovery hook (131) and a second recovery hook (133), the first recovery hook (131) and the second recovery hook (133) being disposed at opposite ends of the filter mesh (11), respectively.

4. Vena cava filter according to claim 1, characterized in that the filter mesh (11) is made of a medical metal material.

5. Vena cava filter according to claim 1, characterized in that the membrane (15) is a PTFE membrane.

6. The vena cava filter according to claim 1, characterized in that the vena cava filter (10) further comprises positioning barbs (17).

7. Vena cava filter according to any of claims 1-6, characterized in that the filter mesh (11) further comprises at least one auxiliary filter mesh (12) inside.

8. Vena cava filter according to claim 1, characterized in that the filter mesh (11) is provided as a mesh cylinder like structure, the filter mesh (11) being provided with a first end (115) being provided in a closed configuration and a second end (116) being provided in an open configuration, the retrieval hook (13) being provided as a bi-directional retrieval hook (135) connected to the first end (115).

9. The vena cava filter according to claim 8, wherein the vena cava filter (10) comprises two filter meshes (11), wherein the two first ends (115) are connected, and wherein the bi-directional retrieval hook (135) is disposed at the junction of the two filter meshes (11).