A stent suitable for the curved part of the urethra

Abstract

The invention provides a stent suitable for curved urethra. The body of the urethral stent is a tubular structure made of degradable or non-degradable materials. The tubular structure is in a straight state before implantation. At least a part is bent; the tube wall of the tubular structure is formed by arranging and combining concave hexagonal structures; in the concave hexagons where the bending occurs after being implanted into the human body, they are arranged sequentially from the outside of the bend to the inside of the bend The angle θ formed by the straight side and the hypotenuse of the concave hexagon gradually increases. After the urethral stent of the present invention is implanted in the stricture of the urethra, the inner diameter and length of the stent can be increased by means of balloon expansion, etc., and the stent can be bent at the same time after implantation to adapt to the urethral membrane, bulb, etc. The physiological curvature of the pubic and anterior curvature of the pubic bone reduces the straightening of the urethra caused by excessive stiffness of the stent, which in turn causes problems such as intimal hyperplasia and restenosis of the stent.

Description

technical field [0001] The application of the present invention relates to the field of medical devices, in particular to a bracket suitable for the curved part of the urethra Background technique [0002] Urethral stricture is one of the common diseases of the urinary system. The main symptoms of urethral stricture are dysuria and prolonged urination. In addition, because the urine cannot be discharged in the narrow place and the retention will cause inflammation, so patients with urethral stricture are often accompanied by chronic urethritis, which may lead to a series of more serious diseases such as urinary tract infection, and even more serious diseases. Kidney failure and uremia caused by bacterial infection. Urethral stricture is a common disease of the urinary system, with an incidence rate of 2‰ to 12‰. It is estimated that more than 6 million patients in my country need treatment for urethral stricture every year. [0003] For urethral stricture, the current clin...

AI Technical Summary

Problems solved by technology

Although the stent eventually presents a small arc bending under the interaction with the urethral tissue, it still cannot solve the problem of urethral straightening

[0005] At the same time, the above-mentioned urethral stent still has the problem that the existing urethral stent structure is affected by the shear force during the flow of urine, the axial direction of the stent will increase and the inner diameter will decrease, which will easily cause the stent to fail. , resulting in the displacement of the stent

However, in the prior art, the problem of using a negative Poisson’s ratio structure as a urethral stent is that the human urethra presents a complex curved structure, and how to match the urethral stent with a negative Poisson’s ratio structure to the physiological structure of the human urethra, This is an unresolved technical problem in this field

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