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A ureteral stent (pronounced you-REE-ter-ul), or ureteric stent, is a thin tube inserted into the ureter to prevent or treat obstruction of the urine flow from the kidney. The length of the stents used in adult patients varies between 24 and 30 cm. Additionally, stents come in differing diameters or gauges, to fit different size ureters.
The presence of indwelling ureteral stents may cause minimal to moderate discomfort, frequency or urgency incontinence, and infection, which in general resolves on removal. Most ureteral stents can be removed cystoscopically during an office visit under topical anesthesia after resolution of urolithiasis. [116]
A ureteric balloon catheter is a balloon catheter intended for treating strictures of the ureter. In fact it is a double J stent on which a balloon is mounted. It is connected to a delivery device (pusher) to introduce it from the bladder into the ureter. The system comprises a non-return valve device, and a pusher with a stylet and two ports.
Vascular stents are used for peripheral and cerebrovascular disease, while ureteral stents ensure the patency of a ureter. Prostatic stents can be temporary or permanent and are used to treat conditions like benign prostatic hyperplasia. Colon and esophageal stents are palliative treatments for advanced colon and esophageal cancer.
In some cases, a ureteral stent is placed at the time of the anastomosis, with the assumption that it allows for better drainage and healing. However, using a modified Lich-Gregoir technique, Gaetano Ciancio developed a technique which no longer requires ureteral stenting, avoiding many stent related complications.
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At the present time, there is one temporary prostatic stent that has received U.S. Food and Drug Administration (FDA) approval. [4] The Spanner [5] temporary prostatic stent maintains urine flow and allows natural voluntary urination. The prostatic stent is a completely internal device and can be inserted and removed as easily as a Foley ...