Biodegradable spiral ureter bracket and preparation method thereof

Abstract

The invention relates to a biodegradable spiral ureter bracket which is characterized by being prepared from biodegradable polymer material, preferably poly-L-lactic acid or a mixture of the poly-L-lactic acid and poly-DL-lactic acid. The invention further comprises a preparation method of the biodegradable spiral ureter bracket, which comprises the step of: forming a film by a solution prepared by a solvent in a die, cutting the film into strips and winding the film strips to shape spirally. By using a biodegradable material which forms tiny fragments in a process of degradation in vitro, the bracket provided by the invention can be excreted from the body with urine and does not block the ureter. Meanwhile, the bracket can be completely degraded without being taken out through a secondary operation after a period of time. Therefore, sufferings of patients are abated.

Description

Technical field [0001] The invention relates to the technical field of medical engineering, in particular to a biomedical ureteral stent material. Background technique [0002] The ureteral stent tube is a convenient ureteral catheter. It is also known as double helix tube, pigtail tube, double J tube or hook tube. It is generally used for a variety of indications in urology, from urolithiasis to urinary tract reconstruction, to trauma and transplantation. It can be cured after being implanted in the ureter. It plays an important role in draining urine and preventing ureteral stricture and adhesion. In the early 1970s, people began to study convenient indwelling ureteral stents. The material of the early stent tube was very rigid, which caused difficulty in insertion and discomfort for the patient. In 1978, Finney, Hepperlen and colleagues first explained the application of double J tube and single J tube. Since then, the modern ureteral stent tube was born and began to devel...

AI Technical Summary

Problems solved by technology

However, since these materials cannot be degraded and absorbed in the human body, the existing D-J tube products have some insurmountable defects in their application:

[0004] (1) It must be removed through an invasive operation, that is, through a cystoscope. Although this type of cystoscopy operation is not a major operation, the patient will suffer terribly. Lesions that lead to infection and edema, often requiring emergency treatment

[0005] (2) Due to various reasons, many patients will forget to extubate or delay extubation. When the non-absorbable stent tube is left in the body for a long time to form urinary stones, when it cannot be removed through the cavity, open surgery has to be taken out, which undoubtedly seriously increases the risk of extubation. Patient suffering and financial burden