Kidney stent (medically called a ureteric stent) is a specially designed hollow tube, made of a flexible plastic material. It is commonly placed inside the ureter, between the kidney and the bladder, in order to temporarily relieve obstruction.
Occasionally, one or both ureters may become blocked and prevent the flow of urine from the kidneys to the bladder. Any blockage within the urinary tract that affects the flow of urine can be dangerous. Urine that is backed up in the kidneys causes infections and can also cause serious damage to the kidneys. It is, therefore, vitally important for any blockage within the urinary tract to be promptly relieved, and the cause of the blockage removed or treated.
Stents are designed to stay in the urinary system by having both the ends coiled. The top end coils in the kidney and the lower end coils inside the bladder to prevent it from being displaced during physical activity. Stents are flexible enough to withstand various body movements. The length of the stents used in adult patients varies between 24 to 30 cm. Although there are different types of stents, they all serve the same purpose. The purpose of a stent is to allow drainage of urine from the kidneys to the bladder, whenever there is blockage of the ureters.
Using Kidney Stent to Relieve Obstruction
Ureteric Stent is sometimes used in the following circumstances:
When it is essential to relieve obstruction (such as kidney stone) on a temporary basis, before treatment of the underlying condition is carried out.
It is not possible to identify what has caused an obstruction and immediate treatment is necessary.
Following an operation on the ureters. It takes time for the ureters to heal, so stents are used as a temporary measure to prevent obstruction and allow the ureters to heal properly.
Inserting a Kidney Stent
The procedure for inserting a ureteric stent is relatively straight-forward. A patient is usually placed under general anesthetic before inserting the stent. A special telescope called a cystoscope is then passed through the urethra into the bladder.
The stent is then placed into the ureter and kidney via the opening of the ureter in the bladder. The correct position of a stent is then checked by taking an x-ray.
How is a Kidney stent removed?
Once the underlying condition that caused blockage of the ureter is resolved and the ureter is healed, the stent can be removed. Kidney stent removal is a short procedure.
The stent is removed using a cystoscope, usually under local anesthesia. Sometimes a stent can be left with a thread attached to its lower end that stays outside the body through the urethra. The doctors can remove such stents by just pulling this thread.