Recoverable lotus petal type double-layer point support vena cava filter and manufacturing method thereof

A lotus petal and point support technology, applied in the fields of filters, prostheses, medical science, etc. in blood vessels, can solve the problems of prolonging the retention time of retrievable filters, reducing the degree of endothelialization, etc., so as to help gather thrombus and reduce endothelialization. degree, the effect of improving the overall stability

Active Publication Date: 2019-08-27
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to create a new type of retrievable vena cava filter to solve the problem of the stability of the inferior vena cava filter in the venous vessel, the oblique displacement and the resulting perforation of the inferior

Method used

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  • Recoverable lotus petal type double-layer point support vena cava filter and manufacturing method thereof
  • Recoverable lotus petal type double-layer point support vena cava filter and manufacturing method thereof
  • Recoverable lotus petal type double-layer point support vena cava filter and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as Figure 1~3 As shown, a lotus petal-type double-layer point-supported vena cava filter, retrievable column 1, rear filter screen 2, front filter screen 3 and fixed hook 4 at the end of the screen, the filter is made of nickel-titanium alloy thin tube with laser engraving The rear part is shaped outside the body; the rear filter 2 and the front filter 3 are in the shape of lotus petals, and the rear filter 2 and the front filter 3 are made of several nickel-titanium alloys drawn from the center of the filter in parallel The filter wire is enclosed and diverges in the shape of lotus petals, forming different curved arcs when shaping in vitro. The rear filter screen 2 is relatively gentle with the arc of the horizontal plane. Here, the horizontal plane refers to the plane perpendicular to the central axis of the alloy thin tube. The radian of the front filter 3 is relatively steep; the petal-shaped structures of the front filter 3 and the rear filter 2 are arranged...

Embodiment 2

[0029] Such as Figure 1~3 and Figure 6 As shown, the specification of nickel-titanium alloy thin tube is usually 2.03mmX0.27mm. During the process of filter engraving and forming, six parallel filter wires are cut in parallel from the bottom of the recyclable column 1, that is, the root of the nickel-titanium alloy thin tube, to the rear The upper 1 / 3 of the filter screen 2 is converted into 12 parallel filter wires, and the 12 parallel filter wires are transformed into 24 filter wires at the lower 1 / 3 of the rear filter screen 2, and among the 24 filter wires, the The lengths of the two filter filaments of the bifurcation are one long and the other short, and the 24 adjacent filter filaments are arranged repeatedly in the order of short and long, that is, short filter filaments are adjacent to short filter filaments as a group, and long filter filaments are The long filter filaments are adjacent to each other as a group, and the 24 filter filaments are divided into 6 long ...

Embodiment 3

[0031] Such as Figure 1~3 As shown, the retrievable column 1 is the insertion point for the filter to be inserted and recovered in vivo. Before the filter is inserted, the retrievable column 1 guides it into the long catheter. Release, and the released contractile filter expands into a predetermined shape in the blood vessel to complete the thrombus filtering work.

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Abstract

The invention provides a recoverable lotus petal type double-layer point support vena cava filter and a manufacturing method thereof. The invention relates to a double-layer lotus petal type point support vena cava filter. The filter comprises a recyclable column, a front filter screen, a rear filter screen and a net end fixing hook portion, wherein the recyclable column is located at the end of the filter, and the upper part of the recyclable column is provided with a recovery hook; the front filter screen and the rear filter screen are defined by a plurality of nickel-titanium alloy filter wires which are scattered all around from the center of the recovery column and have arc-shaped petal shapes to improve the support rigidity, and are in front and rear interlacing, so that the meshes of the filter are more uniform, and the interception rate of thrombus is effectively increased under the premise of ensuring sufficient blood circulation area and smooth blood circulation; fixing hooksare distributed at the arc-shaped petal ends of the front and rear filter screens, and are in point contact with the blood vessel during work, which reduces the damage to the blood vessel caused by recovery of the filter. At the same time, the filter screen is divided into front and rear parts, and support points are also divided into front and rear parts, which prevent the rotation of the filterand improve the stability of the point support filter in the blood vessel, thus minimizing the risk of overall offset of the filter during installation and use.

Description

technical field [0001] The invention relates to a vena cava filter and a manufacturing method thereof, belonging to the field of implanted medical devices. Background technique [0002] The vena cava filter is currently the main filter device to prevent pulmonary embolism caused by embolism in the superior and inferior vena cava system. Patients matter. At present, filters are roughly divided into three categories: permanent filters, temporary filters, and recyclable filters. [0003] Permanent filters are often not equipped with a recovery hook, and they are placed in the patient's body for a long time, which is likely to cause problems such as broken wires, perforation of the inferior vena cava and puncture of organs, recurrent PE, and obstruction of the inferior vena cava. Temporary filters are mainly used to prevent pulmonary embolism in the short term after surgery. During use, they need to be fixed with a tethered catheter. There is no special fixing barb, so the sta...

Claims

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Application Information

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IPC IPC(8): A61F2/01
CPCA61F2/01A61F2002/016A61F2002/018A61F2220/0016A61F2230/0063A61F2240/001
Inventor 王化杰王闲颖钱宏亮娄德大陈德珅
Owner HARBIN INST OF TECH AT WEIHAI
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