Lung arterial support with valve

Abstract

The invention relates to the field of medical apparatus technique, which in detail is a cradle with valve pulmonary artery, comprising tubular cradle (1) and valve (2) inside it. The tubular cradle is braided with hyper-elastic shape memory alloy silk, and comprises head (1. 1), neck (1. 2) and body (1. 3). The head is near to heart and in horn shape, which matches to shape of pulmonary artery opening; the neck is a little narrower and connects head and body; the body is straight tube shape, the outer diameter is a little bigger than that of internal diameter of pulmonary artery. The valve comprises valve mount (2. 1) and valve leaf (2. 2), and the valve mount is made from hyper-elastic shape memory alloy silk. The wall of cradle is thin and soft, easy to compress, and it is convenient to put it into tube, thin conveying tube can be used to reduce injury. Because the valve leaf is fixed on valve mount, the sewing of tubular cradle is convenient and it will not move, and the curative effect is ensured.

Description

Technical field [0001] The invention relates to the technical field of medical equipment, and is a valved pulmonary artery stent device. Background technique [0002] Pulmonary valve disease is a common heart valve disease in clinical practice. Since 1982, Kan et al. (Kan JS, White RI Jr, Mitchell SE, et al. Percutaneous balloon valvuloplasty: A new method for treating congenitalpulmonary valve stenosis. N Engl J Med, 1982, 307:504.) first applied percutaneous balloons Since angioplasty has been used to treat pulmonary valve stenosis, this method has gradually matured. At present, it has become the first choice for the treatment of pulmonary valve stenosis. However, for malformations such as pulmonary valve insufficiency and residual pulmonary insufficiency after surgery with or without pulmonary stenosis, Still need to be treated by surgery. Although the surgical technique of pulmonary valve replacement or repair is relatively mature, cardiopulmonary bypass is still required, an...

AI Technical Summary

Problems solved by technology

The former stent is made of platinum-iridium alloy, the valve is directly sutured in the center of the stent, and it needs to be folded before implantation. Because the wall of the tubular stent is hard and cannot self-expand, when it is implanted in the body, a balloon needs to be loaded in the center of the stent , the stent is stretched by balloon pressurization and returns to the shape before folding. Because the balloon is loaded, the stent is larger after folding, and it is difficult to operate when inserting the sheath. Usually, a sheath of 18F or more is required. Not only is it easy to cause damage to the vessel wall, but the valve may be damaged when the balloon is expanded; the nickel-titanium shape memory alloy stent valve is also directly sutured on the vessel wall, although the tubular stent can automatically restore its original shape when implanted in the body, but Due to the hard wall of the tubular stent, the volume is still large after folding, and a relatively thick sheath is also required, which makes the operation more complicated

Because the valves of the above two stents are very soft, suturing them directly on the tube wall not only increases the difficulty of suturing, the valves are difficult to suture on a plane, and the stents are straight tubular structures, and the proximal end often Deformation under pressure may affect the valve, causing the misalignment or unsatisfactory position of the tri-leaflet valve, thus affecting the function of the valve

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