Inferior vena cava filter

Abstract

The utility model discloses an inferior vena cava filter which comprises a recycling hook, a plurality of filtering ribs, a plurality of fixing thorns and a sheathing canal used for containing the filter, one ends of the filtering ribs are fixedly connected with the recycling hook, the fixing thorns are connected to the other ends of the filtering ribs, the filtering ribs are distributed in a bundle shape, and the filtering ribs are made of elastic memory materials. In a storage state, the filtering ribs are in a gathering state; in the natural state, the tail ends of the filtering ribs are bent downwards to form an arch shape, the outer side faces of the filtering ribs are concave faces, the inner side faces of the filtering ribs are convex faces, the fixing thorns are located on the outer side faces of the filtering ribs, in the natural state, the recycling hook is located in the center of the multiple filtering ribs, and the multiple fixing thorns face the same direction and extend in the direction away from the recycling hook. The thorn tips of the fixing thorns face upwards; when the filter is used, the recovery hook is always positioned in the middle of the plurality of filtering ribs, so that the contact between the recovery hook and the vein wall is effectively avoided, and the filter is convenient to take out.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical filters, and particularly relates to an inferior vena cava filter. Background Art

[0002] An inferior vena cava filter is a device placed in the inferior vena cava to prevent the detachment of deep vein thrombosis in the lower extremities and the resulting pulmonary embolism due to blood flow to the pulmonary artery. However, when the existing inferior vena cava filter is in use, if the vein is tortuous or the filter is not placed correctly, when removing the filter, the retrieval hook is likely to cling tightly to the vein wall and be wrapped by proliferated fibrous tissue, resulting in the inability to remove the filter and posing a safety hazard. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an inferior vena cava filter that can effectively solve the problem in the prior art that the retrieval hook is likely to cling tightly to the vein wall when removing the filter, resulting in the inability to remove the filter.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0005] An inferior vena cava filter includes a retrieval hook, a plurality of filter ribs, a plurality of fixing spines, and a sheath for accommodating the filter. One end of the filter rib is fixedly connected to the retrieval hook, the fixing spines are connected to the other end of the filter rib, the plurality of filter ribs are distributed in a bundle, and the filter ribs are made of an elastic memory material; in the accommodated state, the filter ribs are in a gathered state; in the natural state, the ends of the filter ribs are bent downward to form an arch, the outer side surface of the filter rib is a concave surface, the inner side surface of the filter rib is a convex surface, the fixing spines are located on the outer side surface of the filter rib, the retrieval hook is located at the center of the plurality of filter ribs, the orientations of the plurality of fixing spines are the same and all extend away from the retrieval hook, and the tips of the fixing spines face upward.

[0006] As a preferred embodiment of the utility model, an inferior vena cava filter further includes a plurality of support legs. The lower ends of the support legs are fixedly connected to the retrieval hook, the plurality of support legs are distributed in a bundle, in the natural state, the orientation of the support legs is opposite to that of the filter ribs, and the widths of the plurality of support legs are the same as the widths of the plurality of filter ribs.

[0007] As a preferred embodiment of the utility model, the number of the filter ribs is at least 6.

[0008] As a preferred embodiment of the utility model, the number of the support legs is at least 3.

[0009] Implementing the inferior vena cava filter provided by the utility model, compared with the prior art, its beneficial effects are as follows:

[0010] When placing the filter in the inferior vena cava, insert the sheath with the filter into the inferior vena cava, and then retract the sheath to release the filter. Since the filter bars are made of elastic memory material, when the sheath is removed, the ends of multiple filter bars bend downward to form an arch, which can play a role in filtering thrombus and avoid the occurrence of vascular blockage. Moreover, the filter is fixed on the wall of the inferior vena cava by fixing spines. At this time, the retrieval hook is located at the central position of multiple filter bars, avoiding the situation of the retrieval hook adhering to the wall and the difficulty of retrieval caused by the retrieval hook adhering to the wall. When it needs to be removed, pull the retrieval hook, and the fixing spines can be separated from the wall of the inferior vena cava, facilitating the removal of the filter. Thus, in the use state, the retrieval hook is always located in the middle of multiple filter bars, effectively avoiding the contact between the retrieval hook and the venous wall and facilitating the removal of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly introduced below.

[0012] Figure 1 is a schematic structural diagram of an inferior vena cava filter provided by an embodiment of the present invention;

[0013] Figure 2 is a schematic structural diagram of an inferior vena cava filter provided by an embodiment of the present invention in the first state;

[0014] Figure 3 is a schematic structural diagram of an inferior vena cava filter provided by an embodiment of the present invention in the second state;

[0015] Figure 4 is a schematic structural diagram of an inferior vena cava filter provided by an embodiment of the present invention in the third state;

[0016] Figure 5 is a schematic structural diagram of an inferior vena cava filter provided by an embodiment of the present invention in the use state.

[0017] Reference numerals in the drawings:

[0018] Retrieval hook 1; Filter bar 2; Fixing spine 3; Support leg 4; Sheath 5; Venous wall 6. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following combines the accompanying drawings and embodiments to further describe in detail the specific embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. It should be understood that the present utility model uses the terms "first", "second", etc. to describe various information, but this information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information can also be referred to as the "second" information, and similarly, the "second" information can also be referred to as the "first" information.

[0021] As Figure 1 shown, a preferred embodiment of the present utility model provides an inferior vena cava filter, which includes a retrieval hook 1, a plurality of filter ribs 2, a plurality of fixing spines 3, and a sheath 5 for accommodating the filter. One end of the filter rib 2 is fixedly connected to the retrieval hook 1, and the fixing spine 3 is connected to the other end of the filter rib 2. The plurality of filter ribs 2 are distributed in a bundle shape, and the filter rib 2 is made of an elastic memory material; in the retracted state, the filter ribs 2 are in a gathered state; in the natural state, the ends of the filter ribs 2 are bent downward to form an arch, the outer side surface of the filter rib 2 is a concave surface, the inner side surface of the filter rib 2 is a convex surface, the fixing spine 3 is located on the outer side surface of the filter rib 2, the retrieval hook 1 is located at the center of the plurality of filter ribs 2, the orientations of the plurality of fixing spines 3 are the same and all extend away from the retrieval hook 1, and the tips of the fixing spines 3 face upward.

[0022] When the filter is placed in the inferior vena cava, as Figures 2 to 4 shown, the sheath 5 with the filter is inserted into the inferior vena cava, and then the sheath 5 is retracted to release the filter. Since the filter rib 2 is made of an elastic memory material, when the sheath 5 is removed, the ends of the plurality of filter ribs 2 are bent downward to form an arch, so as to be able to filter blood clots and avoid the occurrence of blood vessel blockage. Moreover, the filter is fixed to the inferior vena cava wall 6 by means of the fixing spines 3. At this time, the retrieval hook 1 is located at the center position of the plurality of filter ribs 2, avoiding the situation of the retrieval hook 1 adhering to the wall and the difficulty of retrieval caused by the retrieval hook 1 adhering to the wall; when it is necessary to remove it, the retrieval hook 1 is pulled, and the fixing spines 3 can be disengaged from the inferior vena cava wall 6, facilitating the removal of the filter; thus, in the use state, the retrieval hook 1 is always located in the middle of the plurality of filter ribs 2, effectively avoiding the contact between the retrieval hook 1 and the venous wall 6 and facilitating the removal of the filter.

[0023] Exemplarily, as Figure 5As shown in the figure, an inferior vena cava filter further includes a plurality of support legs 4. The lower ends of the support legs 4 are fixedly connected to the retrieval hook 1. The plurality of support legs 4 are distributed in a bundle shape. In the natural state, the orientation of the support legs 4 is opposite to that of the filter ribs 2. The widths of the plurality of support legs 4 are the same as those of the plurality of filter ribs 2. Thus, in the use state, the support legs 4 can fit on the vein wall 6, so that the support legs 4 and the filter ribs 2 can ensure that the filter is more stable in the axial direction and not prone to tilting.

[0024] Exemplarily, in order to ensure the use effect, the number of the filter ribs 2 is at least 6, and the number of the support legs 4 is at least 3.

[0025] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. An inferior vena cava filter, characterized in that, It includes a retrieval hook, multiple filter ribs, multiple fixing thorns, and a sheath for accommodating the filter. One end of the filter rib is fixedly connected to the retrieval hook, the fixing thorn is connected to the other end of the filter rib, and the multiple filter ribs are distributed in a bundle. The filter rib is made of an elastic memory material; In the accommodated state, the filter ribs are in a gathered state; in the natural state, the ends of the filter ribs are bent downward to form an arch. The outer side surface of the filter rib is a concave surface, the inner side surface of the filter rib is a convex surface, the fixing thorn is located on the outer side surface of the filter rib, the retrieval hook is located at the center of the multiple filter ribs, the orientations of the multiple fixing thorns are the same and all extend away from the retrieval hook, and the tip of the fixing thorn faces upward.

2. The inferior vena cava filter according to claim 1, characterized in that, It further includes multiple support legs. The lower ends of the support legs are fixedly connected to the retrieval hook, and the multiple support legs are distributed in a bundle. In the natural state, the orientation of the support legs is opposite to that of the filter ribs, and the widths of the multiple support legs are the same as those of the multiple filter ribs.

3. The inferior vena cava filter according to claim 1, characterized in that The number of the filter ribs is at least 6.

4. The inferior vena cava filter according to claim 2, wherein, The number of the support legs is at least 3.

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