Infant pulmonary artery stent

Abstract

The invention relates to the technical field of vascular intervention, in particular to an infant pulmonary artery stent. The stent is of a balloon dilatation type and comprises a plurality of net-tube-shaped unit joints and connecting rods, wherein each unit joint comprises a plurality of joint rods connected end to end, and the unit joints define a ring; the connecting rods are connected to the adjacent unit joints, the number of the joint rods in each unit joint is 12-30, the connecting position of every two joint rods is in arc transition, the connecting rods are evenly distributed in the circumferential direction of the unit joints, the connecting position of one connecting rod is arranged with an interval of at least one arc transition, and the connecting positions of the adjacent unit joints are correspondingly connected through the connecting rods. The infant pulmonary artery stent is suitable for infants, has good flexibility and can meet the requirement for interventional therapy of infant patients.

Description

technical field [0001] The present application relates to the technical field of vascular intervention, in particular to a pulmonary artery stent for infants. Background technique [0002] Pulmonary artery stenosis includes congenital and acquired stenosis according to its etiology. Among them, congenital stenosis is mostly caused by congenital heart disease with dysplasia of pulmonary circulation, such as tetralogy of Fallot, pulmonary atresia, etc., while acquired stenosis is mostly caused by surgery, such as anastomotic stenosis after surgery. [0003] The physiological characteristics of the pulmonary artery are: low pressure, thin vessel wall, large size, large contraction and diameter change, and venous blood in it. The tissue structure at the stenosis site is mostly caused by postoperative scar or hyperplasia, which is more difficult to expand than normal vascular tissue. At the same time, the variable diameter of the pulmonary artery will be relatively large, and t...

AI Technical Summary

Problems solved by technology

However, at present, there is no specialized pulmonary artery stent in clinical practice at home and abroad, and alternative stents are used, such as the CP stent for aortic stenosis or the biliary stent for biliary stenosis. High, high fracture rate, incomplete coverage and other factors cannot meet the requirements of pulmonary artery stenosis; the latter cannot adapt to the narrow pulmonary artery with variable anatomical structure because of the small diameter range of the stent, small supporting force, and large shortening. Pulmonary artery stents that expand according to pulmonary artery anatomy

[0004] In particular, when stents are applied to infants, the blood vessels at the end of the pulmonary arteries of infants are small and tortuous, and it is relatively difficult to push the stents to the target position; moreover, the body growth and development of infants and young children vary greatly, and the blood vessels themselves will continue to grow after treatment, resulting in Passive stenosis at the stent, which puts higher requirements on the design of pulmonary artery stents

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