Developable and recoverable self-expanding ureteral stent tube and preparation method thereof

Abstract

The invention relates to a developable and recoverable self-expanding ureteral stent tube and a preparation method thereof. The ureteral stent tube is prepared from a yarn in a crochet needle knitting method, in the crochet needle knitting process, the remaining yarn of the yarn after the ureteral stent tube is knitted serves as a recovery tail, and the recovery tail is recovered by overlooking observation. A string of V-shaped yarn structures form a coil on the uppermost layer of a support pipe, the recycling tails are sequentially sleeved in the V-shaped yarn structures in a stringing mode to form a ring shape, and specifically, the recycling tails penetrate out of one side of one V-shaped yarn structure and then penetrate through the other side of the next V-shaped yarn structure, operation is repeated, and the remaining thread is locked by the coil on the uppermost layer of the ureter stent tube; and one end of the prepared ureteral stent tube is of a temporary fixing structure formed by the recycling tail. When the ureteral stent tube is removed, the whole ureteral stent tube is directly disassembled into a line to be pulled and taken out, secondary injury to a patient caused by removal is avoided, and the ureteral stent tube has self-expansibility and good developing performance.

Description

technical field [0001] The invention belongs to the technical field of biomedical devices, and relates to a developable and recoverable self-expandable ureteral stent tube and a preparation method thereof. Background technique [0002] The ureteral stent is a specially designed hollow tubular stent placed on the lumen of the patient's ureter. It is one of the commonly used instruments in urology. Obstruction and stenosis. Ureteral stent design focuses on raw materials, surface characteristics, and shape design. An ideal ureteral stent should have the following characteristics: (1) It has certain compression and tensile properties, and can resist the pressure and peristalsis of the ureter. Keep the ureter unobstructed; (2) It has good biological compatibility, soft texture, smooth surface, is not easy to deposit stones and is antibacterial; (3) It can be absorbed by itself or taken out in a painless form, without causing secondary harm to the patient. Therefore, developing ...

AI Technical Summary

Problems solved by technology

The effect of magnetism can make the overall shrinkage of the stent during recovery, and the diameter becomes smaller. However, this kind of stent is special and requires a matching recovery device, which is difficult to be widely used, and the possible adhesion between the stent and the tissue is not considered. If the adhesion is serious , the magnetic force may be insufficient and the pulling force against adhesion

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