An inferior vena cava filter with cutting structure

Abstract

The application relates to a lower vena cava filter with a cutting structure and belongs to the technical field of medical devices. The lower vena cava filter comprises a recovery column, a recovery structure is arranged on the recovery column, a support mechanism comprises a plurality of support structures connected to the recovery column, the plurality of support structures are arranged at intervals in the circumferential direction of the recovery column, and a cutting structure is arranged on one side of each support structure in the direction of the axis of the recovery column. In the application, the cutting structure is arranged on the inner side of the support structure. In the process of recovering the lower vena cava filter, the cutting structure can cut the proliferative intima, the damage to the inner wall of the vein caused by irregular tearing of the proliferative intima when the lower vena cava filter is pulled is avoided, the incidence of complications of the lower vena cava filter is effectively reduced, and the time window for taking out the lower vena cava filter is prolonged to some extent, thereby prolonging the protection time of the patient.

Description

Technical Field

[0001] This utility model relates to an inferior vena cava filter with a cutting structure, belonging to the field of medical device technology. Background Technology

[0002] Pulmonary embolism is a clinical and pathophysiological syndrome caused by the blockage of the pulmonary artery or its branches by endogenous or exogenous emboli, leading to pulmonary circulatory disturbances. Thrombi often originate from the deep veins of the lower extremities and are a common clinical condition. Causes of pulmonary embolism include advanced age, prolonged bed rest, long-distance travel, obesity, tumors, long-term use of contraceptives, surgery and trauma, as well as congestive heart failure from various causes and pre-existing thromboembolic diseases. These factors or diseases often lead to venous blood stasis, increased blood viscosity, and vascular endothelial damage, thus easily forming thrombi.

[0003] In clinical practice, pulmonary embolism is often prevented by implanting an inferior vena cava filter. Currently, there are several types of inferior vena cava filters used clinically, broadly categorized into "fusiform" and "umbrella-shaped" filters. Each has its advantages and disadvantages and is widely used in clinical practice. The "fusiform" filter, due to its "beam-column" structure adhering to the inferior vena cava wall, is more prone to endothelial cell proliferation and encapsulation after prolonged placement, making removal difficult. Therefore, the removal window for "fusiform" filters is shorter, typically within 2-3 weeks. However, in clinical practice, some special cases exceeding this time window may occur. Removing the filter after the time window can lead to adhesion between the filter and the vessel wall. Severe adhesion can prevent filter removal or cause damage to the vessel wall. Utility Model Content

[0004] The purpose of this invention is to provide an inferior vena cava filter with a cutting structure to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an inferior vena cava filter with a cutting structure, the inferior vena cava filter comprising:

[0006] A recycling column, on which a recycling structure is installed;

[0007] The support mechanism includes a plurality of support structures connected to the recycling column, the plurality of support structures being arranged at circumferential intervals along the recycling column, and a cutting structure being arranged on one side of each support structure facing the axial direction of the recycling column.

[0008] Furthermore, the cutting structure is a micro-cutting blade, and the planes containing a plurality of the micro-cutting blades intersect at the axis of the recycling column.

[0009] Furthermore, the micro-cutting blades are right-angled triangles and are arranged in an increasing order from the end closest to the recycling structure toward the end furthest from the recycling structure.

[0010] Furthermore, the micro-cutting blade is semi-circular or trapezoidal, and is arranged in a rising and then falling trend from the end near the recycling structure to the end away from the recycling structure.

[0011] Furthermore, the support structure includes beams and columns arranged parallel to the axis of the recycling column and connecting rods connecting both ends of the beams and columns.

[0012] Furthermore, the cutting structure is arranged on the beam and column, and is located at one end away from the recycling column.

[0013] Furthermore, the connecting rod is in the shape of a herringbone, and each connecting rod is connected to two sets of beams and columns.

[0014] Furthermore, the inferior vena cava filter also includes a retaining ring, which is fixed to the connecting rod located away from the recovery column.

[0015] The beneficial effects of this utility model are as follows: By arranging a cutting structure on the inner side of the support structure, the proliferating intima can be cut open during the retrieval of the inferior vena cava filter. This avoids damage to the inner wall of the vein caused by irregular tearing of the proliferating intima during the retrieval of the inferior vena cava filter, effectively reducing the incidence of complications during the removal of the inferior vena cava filter. At the same time, it can extend the removal time window of the inferior vena cava filter to a certain extent, thus extending the protection time for the patient.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the inferior vena cava filter with a cutting structure according to an embodiment of this application;

[0018] Figure 2 for Figure 1 Structural diagram of the central beam-column structure and the cutting structure. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "on" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] Please refer to Figures 1 to 2 An embodiment of this application shows an inferior vena cava filter with a cutting structure, which includes a retrieval column 10, a support mechanism 20, and a fixing ring 30.

[0025] The recovery column 10 is provided with a recovery structure 11, which is used to connect with the recovery device to facilitate the recovery of the inferior vena cava filter. This is existing technology and will not be described in detail here.

[0026] The support mechanism 20 includes several support structures connected to the recycling column 10. The several support structures are arranged at intervals along the circumference of the recycling column 10, and a cutting structure is arranged on one side of each support structure facing the axis of the recycling column 10.

[0027] In one embodiment, the cutting structure is a micro-cutting blade 22, and the planes containing a plurality of micro-cutting blades 22 intersect at the axis of the recovery column 10. This arrangement ensures that the cutting angle of the micro-cutting blades 22 is located inside the support structure, thus avoiding scratching the inner wall of the vein while cutting the hyperplastic endometrium.

[0028] In one embodiment, the micro-cutting blades 22 are right-angled triangles and are arranged in an increasing order from the end closest to the recovery structure 11 toward the end furthest from the recovery structure 11. The triangular blades are small in size, which facilitates filter compression and does not occupy too much space, while also facilitating the cutting of the proliferating endometrium.

[0029] In one embodiment, the micro-cutting blade 22 is semi-circular or trapezoidal, arranged in an ascending-descending trend from the end near the recovery structure 11 to the end away from the recovery structure 11. That is, the diameter side of the semi-circle or the base side of the trapezoid is fixedly connected to the support structure, making both ends of the micro-cutting blade 22 relatively smooth, avoiding blood accumulation at the ends of the micro-cutting blade 22, reducing the impact on blood flow, and making the overall structure compact and space-saving.

[0030] In one embodiment, the support structure includes a beam 21 arranged parallel to the axis of the recovery column 10 and connecting rods 23 connected to both ends of the beam 21. The beam 21 is a flat column shape to facilitate its fit against the inner wall of the vein. By closely adhering to the inner wall of the vein with the beam 21 to provide support, blood flow is facilitated, thereby reducing the risk of fatal pulmonary embolism.

[0031] In one embodiment, the cutting structure is arranged on the beam 21 and located at the end away from the retrieval column 10. This arrangement facilitates cutting the hyperplastic inner wall from the distal end of the beam 21 when the inferior vena cava filter is retrieved, minimizing the occurrence of irregular tears.

[0032] In one embodiment, the connecting rods 23 are in a herringbone shape, and each connecting rod 23 is connected to two sets of beams and columns 21. This arrangement provides more stable support for the beams and columns 21, preventing displacement of the beams and columns 21 that could lead to poor support.

[0033] In one embodiment, the inferior vena cava filter further includes a retaining ring 30, which is fixed to a connecting rod 23 located away from the retrieval post 10. By providing the retaining ring 30, the support structure is arranged in a prismatic shape with both ends contracted when unfolded, facilitating implantation and retrieval.

[0034] This application, by arranging a cutting structure on the inner side of the support structure, allows the proliferating intima to be cut during the retrieval of the inferior vena cava filter. This avoids damage to the venous wall caused by irregular tears resulting from pulling on the proliferating intima during retrieval, effectively reducing the incidence of complications during inferior vena cava filter removal. At the same time, it can extend the retrieval time window of the inferior vena cava filter to a certain extent, thus extending the protection time for the patient.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A filter for the inferior vena cava with a cutting structure, characterized in that, The inferior vena cava filter includes: A recycling column, on which a recycling structure is installed; The support mechanism includes a plurality of support structures connected to the recycling column, the plurality of support structures being arranged at circumferential intervals along the recycling column, and a cutting structure being arranged on one side of each support structure facing the axial direction of the recycling column.

2. The inferior vena cava filter with a cutting structure as described in claim 1, characterized in that, The cutting structure is a miniature cutting blade, and the planes containing a plurality of the miniature cutting blades intersect at the axis of the recovery column.

3. The inferior vena cava filter with a cutting structure as described in claim 2, characterized in that, The micro-cutting blades are right-angled triangles and are arranged in increasing order from the end closest to the recycling structure to the end furthest from the recycling structure.

4. The inferior vena cava filter with a cutting structure as described in claim 2, characterized in that, The micro-cutting blade is semi-circular or trapezoidal, and is arranged in a rising and then falling trend from the end near the recycling structure to the end away from the recycling structure.

5. The inferior vena cava filter with a cutting structure as described in claim 1, characterized in that, The support structure includes beams and columns arranged parallel to the axis of the recycling column and connecting rods connecting the two ends of the beams and columns.

6. The inferior vena cava filter with a cutting structure as described in claim 5, characterized in that, The cutting structure is arranged on the beam and column, and is located at the end away from the recycling column.

7. The inferior vena cava filter with a cutting structure as described in claim 6, characterized in that, The connecting rod is in the shape of a herringbone, and each connecting rod is connected to two sets of beams and columns.

8. The inferior vena cava filter with a cutting structure as described in claim 7, characterized in that, The inferior vena cava filter also includes a retaining ring, which is fixed to the connecting rod located away from the recovery column.

Images