Stepped balloon

Abstract

The invention provides a stepped balloon. The stepped balloon comprises an expandable balloon, a catheter and a developing ring, wherein the balloon is nested on the catheter, and the near end and the far end of the balloon are in sealed connection with the catheter; the whole balloon is trapezoid, two ends of the balloon are tapered sections, and the middle of the balloon is formed by three tapered section structures with small taper; the balloon has two layers, is formed by compositing one or more polymers, can avoid the explosion risk and can have good comprehensive performance. The stepped balloon is more suitable for a tapered blood vessel with the inner diameter reducing gradually, the wall attaching performance of a scaffold is improved, the scaffold implanting process can be completed only through one-time operation, and the operation difficulty is greatly reduced. The inner surface of the catheter or the surface of a guide wire is coated with a lubricating layer, the friction force between the catheter and the guide wire is reduced, and sliding of the guide wire is better facilitated.

Description

technical field [0001] The invention belongs to an interventional medical device, and relates to a balloon expansion catheter for percutaneous coronary angioplasty to treat coronary artery blockage, in particular to a stepped balloon suitable for expanding a stepped vascular stent. Background technique [0002] Cardiovascular diseases seriously affect people's quality of life. At present, more than 1.5 million patients worldwide receive percutaneous coronary intervention every year, and the proportion of vascular stents used to treat coronary artery stenosis in China is also increasing year by year. Percutaneous coronary stenting has become the most important interventional therapy for coronary artery disease because of its high efficiency, minimal invasiveness, low medical expenses, low risk, and short hospital stay. Percutaneous puncture coronary artery stenting uses a balloon delivery system to push the stent held on the periphery of the balloon, enter the aorta through t...

AI Technical Summary

Problems solved by technology

In clinical practice, the traditional round straight stent with constant diameter is often used to expand the conical vascular stenosis, which is easy to cause malapposition at the proximal end of the stent and overexpansion at the distal end of the stent, resulting in excessive damage to the distal end of the vessel and increasing the surgical cost. Possibility of subsequent thrombosis or restenosis

Clinically, single-layer balloons are mostly used, and the materials of each part are the same. During use, there is a risk of balloon inflation and inflation in the patient's body. At the same time, it is difficult for single-layer balloons to have good comprehensive performance. performance

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