CN216257631U

CN216257631U - Vena cava filter

Info

Publication number: CN216257631U
Application number: CN202023113366.XU
Authority: CN
Inventors: 陈祥亨; 周云鹏; 厉拓
Original assignee: Hangzhou Yunpu Medical Equipment Co ltd
Current assignee: Zhejiang Boyi Yunhua Medical Instrument Co ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2022-04-12
Anticipated expiration: 2030-12-22

Abstract

The utility model discloses a vena cava filter, comprising: the device comprises two symmetrically arranged filter screens, a support rod connected between the filter screens and a recoverer arranged in the center of the filter screens; the filter screen is composed of braided wires; the filter screen is woven by the braided wire, the density of the filter screen is increased, the filter can filter fine thrombus, the safety of the filter after being implanted is effectively improved, and the probability of embolism of a patient is obviously reduced.

Description

Vena cava filter

Technical Field

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

Background

Deep Venous Thrombosis (DVT) of the lower limb is a common clinical disease and is also the leading cause of pulmonary artery embolism (PE). The deep venous thrombosis falls off into the pulmonary circulation or a branch thereof, so that a series of clinical pathophysiological changes mainly caused by pulmonary circulation dysfunction can seriously cause sudden death. The placement of the Inferior Vena Cava Filter (IVCF) is effective in preventing pulmonary embolism, and the basic principle is to trap fatal emboli through a filter screen placed at the vena cava to prevent the fatal emboli from entering the pulmonary circulation. The use of venous filters is now becoming more widespread. In order to improve the use effect of the filter, reduce the influence of complications and make thrombolytic therapy safer, new design schemes are continuously proposed for the filter.

The problems mainly shown in the clinical use of the existing filter are as follows: the filter screen clearance is big, because the vein filter of present design adopts alloy tubular product cutting design to form mostly, thereby receive the restriction of technology mode to lead to filter net clearance generally bigger than normal, can't play the effect of filtering tiny thrombus behind the implantation blood vessel. The area of a single grid of a filter screen of a vein filter used clinically at present is generally more than 25mm²Therefore, the interception ability is poor for thrombi with a diameter of less than 5 mm.

In view of the many drawbacks and challenges still present in the art of endoluminal filtration, the market needs a new venous filter capable of filtering fine thrombi, which the present invention addresses.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model aims to provide a vena cava filter, which is woven into a filter screen by braided wires, can filter fine thrombus, effectively improves the safety of the filter after being implanted, and obviously reduces the probability of embolism occurrence of a patient.

In order to achieve the above object, the present invention adopts the following technical solutions:

a vena cava filter, comprising: the device comprises two symmetrically arranged filter screens, a support rod connected between the filter screens and a recoverer arranged in the center of the filter screens; the filter screen is composed of braided wires.

In the vena cava filter, the filter screen is provided with the connecting angles, and the support rod is connected between the connecting angles of the filter screen.

The vena cava filter has six connection angles.

In the vena cava filter, the filter screen is connected with the support rod through a knot.

In the vena cava filter, the braided wire is non-degradable wire with good biocompatibility, and the wire diameter range of the braided wire is 0.1-0.5 mm.

In the vena cava filter, the braided wires are braided into a quadrilateral mesh.

In the vena cava filter, the braided wires are braided into a triangular grid shape.

In the vena cava filter, the braided wires are braided into a hexagonal grid.

The vena cava filter and the recoverer are recovery hooks.

The utility model has the advantages that:

the filter screen is woven by the braided wire, so that the problem of large gap of the filter screen on the market is solved, the thrombus with the diameter less than 5mm can be effectively intercepted, the safety of the implanted filter is effectively improved, and the probability of embolism of a patient is obviously reduced;

the shape of the meshes of the filter screen can be changed and replaced according to the actual thrombus condition, so that the application range is enlarged;

drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural view of one embodiment of a filter screen of the present invention;

fig. 3 is a schematic structural view of another embodiment of the screen of the present invention.

The meaning of the reference symbols in the figures:

1 filter screen, 101 braided wire, 102 connecting angle, 2 support bar and 3 recoverer.

Detailed Description

The utility model is described in detail below with reference to the figures and the embodiments.

A vena cava filter, comprising: the device comprises two symmetrically arranged filter screens 1, a support rod 2 connected between the filter screens 1 and a recoverer 3 arranged in the center of the filter screens 1; the screen 1 is woven from single-strand woven wires 101 in a mesh shape. The bracing piece 2 has many, distributes around filter screen 1, and filter screen 1 is fixed on bracing piece 2 through the mode system of knot, and bracing piece 2 can strut the filter in the blood vessel after the filter is implanted to can stabilize in the blood vessel, guarantee the filter and implant human back holding position and the stability of structure. Preferably, the retriever 3 is a retrieval hook, and the retrieval hook is one and is disposed at the center of one of the filter screens 1, so that the filter can be removed from the blood vessel of the human body through the retrieval hook after the filter is implanted into the human body for a certain period of time, thereby preventing complications and other hazards caused by the permanent implantation of the filter.

The filter screen 1 is provided with connecting angles 102, and the support rod 2 is connected between the connecting angles 102 of the filter screen 1; preferably, as shown in fig. 1 and 2, the number of the connecting angles 102 is six, and the number of the connecting angles 102 is not limited and is determined by the number of the support bars 2.

The braided wire 101 is a non-degradable wire with good biocompatibility, and as an example, a polyester wire, a nylon wire, a polypropylene wire, and a polytetrafluoroethylene wire, it should be noted that the examples herein are not exhaustive, and any non-degradable wire with good biocompatibility can be applied to the present invention; as an example, the diameter of the braided wire 101 is: 0.1-0.5 mm.

The shape of the mesh of the filter screen 1 can be any polygon or circle, and the mesh area of the single filter screen 1 is as follows: 4-25mm²(ii) a Preferably, as shown in fig. 1, the braided wire 101 is braided in a quadrangular lattice shape; as shown in fig. 2, the braided wire 101 is braided in a triangular mesh shape; as shown in fig. 3, the braided wires 101 are braided in a hexagonal lattice shape.

As shown in figure 1, the vein filter is preferably of a spindle-shaped structure, the two ends of the spindle body are respectively provided with a filter screen 1, the filter screens 1 are made of single-stranded 0.3mm polypropylene wires and are woven into a quadrilateral grid shape, and the area of each single grid is 16mm². The filter screen 1 can effectively filter thrombus after being opened in blood vessels, prevents the thrombus from entering arteries to cause embolism, and plays a role in protecting patients.

According to the utility model, the filter screen 1 is woven by the braided wire 101, so that the density of the filter screen 1 is improved, and therefore, fine thrombus is intercepted and prevented from entering an artery to cause embolism; effectively improve the safety of the filter after being implanted and obviously reduce the probability of embolism of a patient.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A vena cava filter, comprising: the device comprises two symmetrically arranged filter screens, a support rod connected between the filter screens and a recoverer arranged in the center of the filter screens; the filter screen comprises braided wire.

2. A vena cava filter according to claim 1 wherein the filter screens are provided with attachment corners and the support rods are attached between the attachment corners of the filter screens.

3. The vena cava filter according to claim 2, wherein the connection angles are six.

4. A vena cava filter according to claim 1 wherein the filter mesh is attached to the support rod by a knot.

5. The vena cava filter according to claim 1, wherein the braided wire is a non-degradable wire having good biocompatibility, and the wire diameter of the braided wire ranges from 0.1 to 0.5 mm.

6. The vena cava filter according to claim 1, wherein the braided wires are woven in a quadrilateral mesh.

7. The vena cava filter according to claim 1, wherein the braided wires are woven in a triangular grid pattern.

8. The vena cava filter according to claim 1, wherein the braided wires are woven in a hexagonal grid pattern.

9. The vena cava filter according to claim 1, wherein the retriever is a retrieval hook.