Safety improved pulmonary artery stent and pulmonary artery valve replacement device

Abstract

The invention discloses a safety improved pulmonary artery stent and a pulmonary artery valve replacement device. The safety improved pulmonary artery stent comprises a pipe-shaped supporting net stent and two flaring sections which are connected with two axial ends of the supporting net stent; every flaring section is connected with an end portion of the supporting net stent through a fixing part; one ends of the flaring sections, which are back to the supporting net stent, is provided with a plurality of wave crests which are provided with smooth edges. The pulmonary artery valve replacement device comprises the safety improved pulmonary artery stent and a prosthesis valve which is arranged inside the pulmonary artery stent. According to the safety improved pulmonary artery stent, the flaring sections are connected with the supporting net stent through the fixing parts, namely, the flaring sections and the supporting net stent are connected in a detachable mode, the safety is improved, the utilization is flexible, and meanwhile machining difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of medical technology, and in particular relates to a pulmonary artery stent and a pulmonary valve replacement device with improved safety. Background technique [0002] For patients with cyanotic congenital heart disease with narrow right ventricular outflow tract, thoracotomy under cardiopulmonary bypass should be performed in infants or early childhood. [0003] Tetralogy of Fallot (TOF) is the most common form of congenital heart disease with cyanotic right ventricular outflow tract stenosis. According to data from Shanghai Children's Medical Center, the most common age of patients undergoing TOF surgery is 6 months to 3 years old, and patients in this age group account for 74% of the total number of operations. Classic surgery includes VSD repair, right ventricular outflow tract obstruction and relief of pulmonary artery (annulus and valve) stenosis. [0004] Usually, most tetralogy of Fallot is complicated wit...

AI Technical Summary

Problems solved by technology

[0007] The pulmonary valve replacement device in the prior art is composed of a mesh stent made of memory metal material and a unidirectionally openable trileaf valve sewn into the stent. figure 1 It shows a pulmonary artery stent of an existing pulmonary valve replacement device, which has a mesh saddle-shaped cylindrical structure. The mesh structure is composed of regular rhombuses. Usually, a pulmonary artery stent is cut and processed on a memory metal material tube by a laser , forming a diamond-shaped hollow shape, when the pulmonary artery stent is released, the pulmonary artery stent expands like figure 1 The state shown, but based on the limitations of the processing technology, the ends of the expansion of the pulmonary artery stent will still inevitably form sharp protrusions (such as figure 1 The m and n parts of the stent), the sharp protruding part is easy to puncture blood vessels and tissues, which increases the difficulty and risk of the operation. In addition, because the shape of the two ends of the pulmonary artery stent is completely different from that of the middle part, if the entire pulmonary artery stent is integrated Cutting and heat treatment, due to the differences in the physiological structure of different patients, it is necessary to customize a variety of different types of pulmonary artery stents, and the corresponding cutting and heat treatment processes and tools are complicated, which undoubtedly increases the cost of the operation

Images