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Ureteral stent Ureteral stent (detail) 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 ...
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Ureteral stents vary in length from 24 to 30 cm (9.4 to 11.8 in) and most have a shape commonly referred to as a "double-J" or "double pigtail", because of the curl at both ends. They are designed to allow urine to flow past an obstruction in the ureter.
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.
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.
A retrograde pyelogram may be performed to find the cause of blood in the urine, or to locate the position of a stone or narrowing, tumour or clot, as an adjunct during the placement of ureteral stents. [13] It can also be used ureteroscopy, or to delineate renal anatomy in preparation for surgery.
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Chronic upper urinary tract obstruction is treated by the insertion of a ureteric stent or a pyeloplasty. [13] Lower urinary tract obstruction (such as that caused by bladder outflow obstruction secondary to benign prostatic hyperplasia) is usually treated by insertion of a urinary catheter or a suprapubic catheter. Surgery is not required in ...