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A urinary catheter (also known as an indwelling catheter or long-term catheter) is a hollow, flexible tube inserted through the urethra into the bladder that drains urine into an external collection bag. Generally, urinary catheters are used by patients who are unable to urinate on their own or have impaired mobility. They are essential in avoiding a build-up of urine, which has the potential to cause pressure in the kidneys and lead to kidney failure.
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