Expandable stent with variable-diameter sacculus for children

Abstract

The invention discloses a stent used for portal vein stenosis after liver transplantation in children, and belongs to the field of medical devices. A stent main body consists of a plurality of annularsupports distributed along an axial direction, and two adjacent annular supports are connected by at least one connector. The stent main body is divided into three parts: a proximal end, a middle part and a distal end, the pipe diameter of the middle part is the smallest, and the pipe diameter of the distal end is the largest. According to the present invention, the stent has the advantages thatthe stenosis of diseased vessels which is caused by pipe diameter mismatch and mainly concentrates on diameter changes is treated, the adhesion property of the vessel distal end and the expansion property of the vessel proximal end can be improved, and the physiological adaptability of the stent can be improved; the combined area and friction between the stent and a portal vein stent can be increased, the stability of the stent can be increased, and the incidence of stent displacement can be reduced; and the change of the portal vein intracavitary hemodynamics can be decreased, the risk of restenosis after stent implantation can be reduced, and the occurrence of adverse events can be decreased.

Description

technical field [0001] The invention relates to a children variable-diameter balloon-expandable vascular stent, which belongs to the field of medical devices. Background technique [0002] Pediatric liver transplantation is an effective treatment for children with end-stage liver disease. The prognosis of liver transplantation in children is affected by many factors, the most important of which is the prevention and treatment of complications. Portal vein stenosis is a common vascular complication after liver transplantation in children. If it is not treated in time and effectively, the fatality rate can reach 24%. Due to the shortage of donor resources, the number of children's liver transplantation operations that require technical treatment of grafts such as parental donors and volume reduction has increased. At the same time, the incidence of vascular complications in children after liver transplantation is significantly higher than that in adults. There are a large num...

AI Technical Summary

Problems solved by technology

Since the diameter of the cylindrical non-reducing stent cannot take into account the diameters of the recipient and the donor at the same time, the diameter of blood vessels in young children increases with growth and development. Excessive expansion, all of the above will cause vascular injury, intimal hyperplasia, increase the incidence of in-stent restenosis and even portal vein thrombosis

Therefore, the long-term patency of the portal vein cannot be guaranteed after the cylindrical non-reducing stent is placed in the blood vessel of the child, which affects the success rate of postoperative clinical treatment.

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