Combined self-expanding inferior vena cava stent

Abstract

The inferior vena cava stent is formed by combining a stent upper end, a stent middle section, a stent lower end and stent supporting bodies, the stent supporting bodies comprise the left stent supporting body and the right stent supporting body which are different in height, and the stent supporting bodies have certain elasticity so that the stent supporting bodies can be fixed to the right atrium inner wall and the atrioventricular opening tissue wall; but the elasticity is not too large to prevent the atrial wall from being punctured; the stent middle section is provided with an inner surface and an outer surface which are different in finish degree, and in the implanting process of the inferior vena cava stent, the implanting position can be adjusted in real time and released accurately through matching of developing marks, so that the stent is more attached to the anatomical structure of the inferior vena cava of the human body; due to the special shape design of the left stent supporting body and the right stent supporting body, the stent is more attached to the inner wall of a right atrium and the tissue wall of an atrioventricular opening, the supporting effect of the stent is further enhanced through the frosted rough outer surface of the middle section of the stent and the flat barbs at the lower end of the stent, and implantation is safer and more reliable.

Description

technical field [0001] The invention relates to the field of implantable medical devices, in particular to a combined self-expanding inferior vena cava stent. Background technique [0002] The inferior vena cava is the largest vein in the human body. The normal inner diameter of the inferior vena cava is 2 cm in the proximal segment, 1.9-2.1 cm in the interrupted segment, and 1.7-1.9 cm in the distal segment. It is the main trunk of the inferior vena cava system. It is at the level of the fifth lumbar vertebra , a few in the fourth lumbar vertebra, formed by the confluence of the left and right common iliac veins, the inferior vena cava is located in the right front of the spine, ascends along the right side of the abdominal aorta, passes through the posterior vena cava groove of the liver, and enters the vena cava through the diaphragm. The thoracic cavity, which enters and opens into the right atrium, collects venous blood from the lower extremities, pelvis, and abdominal ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the thin wall of the right atrium of the heart, according to the direction of blood flow, the right atrium has three entrances and one exit, the entrance is the ostium of the superior and inferior vena cava and the ostium of the coronary sinus, and the exit is the opening of the right atrium. The right atrium leads to the right ventricle, The existing inferior vena cava stent has many major defects after implantation, for example, it is easy to cause inaccurate implantation position, unstable support fixation, easy displacement or even falling off of the stent, and the displacement of the stent can cause cardiac stress. Severe complications such as blockage, arrhythmia, atrial wall puncture, atrial-aortic fistula formation, etc., affect the postoperative treatment effect

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