A kind of braided vena cava filter and braiding method

A vein and filter technology, applied in the fields of filters in blood vessels, medical science, prostheses, etc., can solve the problems of collapse of the filter structure, damage to the inner wall of the vena cava, poor blood circulation, etc., and achieve good shape memory function and high elasticity and compliance. Good sex, low stress effect

Active Publication Date: 2017-09-22
SHANGHAI SHAPE MEMORY ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this design has played a good role in fixing, however, because the spindle-shaped filter is mostly made of nickel-titanium alloy tube laser engraving and then shaped at high temperature, there are wire breakages that lead to the collapse of the filter structure and damage to the inner wall of the vena cava, and blood circulation due to vascular embolism. Poor risk and other risks have been reported many times in the literature

Method used

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  • A kind of braided vena cava filter and braiding method
  • A kind of braided vena cava filter and braiding method
  • A kind of braided vena cava filter and braiding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Such as figure 2 a) to figure 2 d) and image 3 a) to image 3 As shown in b), the cone mesh at the proximal end starts from the ligature steel sleeve, and 12 NiTi alloy wires are braided in pairs to form 6 Y-shaped braided structures, and the 6 Y-shaped braided structures are evenly distributed in the circumferential direction. The root of each Y-shaped braided structure is 2 NiTi wires, and the two branches are 1 NiTi wire respectively. The two adjacent NiTi wires of the two adjacent Y-shaped braided structures are merged and continue to be braided to form the middle fixing part. At this time, each of the six braided metal wires in the fixing part is composed of two NiTi wires. 6 braided metal wires extend to the distal end to form a tapered network at the distal end, and each braided metal wire continues to weave into an I-shaped braided structure, which is divided into cones and brought together, and finally fixed by a steel sleeve .

Embodiment 2

[0065] As shown in Figure 4a) and Figure 4 As shown in b), the cone mesh at the proximal end starts from the ligature steel sleeve, and 18 NiTi alloy wires are braided together to form 6 Y-shaped braided structures, and the 6 Y-shaped braided structures are evenly distributed in the circumferential direction. The root of each Y-shaped braided structure is 3 NiTi wires, and the two branches are 2 NiTi wires and 1 NiTi wire respectively. The two adjacent branches of the two adjacent Y-shaped braided structures are merged and continue to be braided into the middle fixing part. At this time, the six braided metal wires of the fixing part are each composed of three NiTi wires. 6 braided metal wires extend to the distal end to form a tapered network at the distal end, and each braided metal wire continues to weave into an I-shaped braided structure, which is divided into cones and brought together, and finally fixed by a steel sleeve .

Embodiment 3

[0067] Such as Figure 5 a) and Figure 5 As shown in b), the conical mesh at the proximal end starts from the ligature steel sleeve, and 24 NiTi alloy wires are braided in pairs to form 6 Y-shaped braided structures, and the 6 Y-shaped braided structures are evenly distributed in the circumferential direction. The root of each Y-shaped braided structure is 4 NiTi wires, and the two branches are respectively 2 NiTi wires. The two adjacent branches of the two adjacent Y-shaped braided structures are merged and continue to be braided into the middle fixing part. At this time, the six braided metal wires in the fixing part are each composed of four NiTi wires. 6 braided metal wires extend to the distal end to form a tapered network at the distal end, and each braided metal wire continues to weave into an I-shaped braided structure, which is divided into cones and brought together, and finally fixed by a steel sleeve .

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Abstract

The invention provides a woven type venae cava filter. The woven type venae cava filter is characterized by comprising a filter part, a fixing part and connecting parts, wherein the filter part, the fixing part and the connecting part are woven together and distributed in sequence from a heart near end to a heart far end; the filter part comprises N1 Y-type woven structures distributed in the circumferential direction; the fixing part comprises N1 ridges distributed in the circumferential direction; the connecting parts are of conical woven structures which are formed by extending directly the N1 ridges of the fixing part and ligating by second steel bushings or conical woven structures which are formed by extending the N1 ridges of the fixing part, then weaving, and then ligating by the second steel bushings. Another technical scheme of the invention provides a weaving method of the woven type venae cava filter. The venae cava filter, provided by the invention, can intercept larger size internal clots in the pulmonary embolism dangerous period, prevents venae pulmonales embolism, keeps smooth for a long term by shear force, can be taken out by an interventional operation after passing the pulmonary embolism dangerous period, and also can remain in a patient's body for a long term.

Description

technical field [0001] The invention relates to a vena cava filter. Background technique [0002] Pulmonary embolism (Pulmonary embolism, PE) is an acute disease with high clinical morbidity and mortality. Its incidence rate ranks third among cardiovascular diseases, second only to hypertension and coronary heart disease, and its mortality rate is 25-30%. According to incomplete statistics, there are currently 355,000 patients with pulmonary embolism in China. [0003] Pulmonary embolism is a series of clinical pathophysiological changes mainly caused by pulmonary circulation dysfunction caused by peripheral deep venous thrombosis or thrombus in the right heart chamber falling off into the pulmonary circulation, blocking the pulmonary artery or its branches. Research results show that 75-90% of the emboli that cause pulmonary embolism originate from the thrombus shed from the pelvic veins or deep veins of the lower extremities. The dislodged thrombus moves up the vena cava...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/01
CPCA61F2/01A61F2002/016A61F2210/0014A61F2230/0063A61F2240/001
Inventor 曾凡艳杨永森陈娟罗鹏蒲忠杰
Owner SHANGHAI SHAPE MEMORY ALLOY
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