A Foley catheter (named after its designer, Frederick Foley) is a flexible tube that is passed through the urethra into the bladder to extract urine . It is the most common type of urinary catheter .
A Foley catheter has two separate channels, or lumens. One lumen is open at both ends, and urine drains into a collection bag. The other lumen has a valve on the outside and is attached to a balloon at the end. The balloon is inflated with sterile water when it is in the bladder to keep it from slipping out. Foley catheters are usually made of silicone rubber or natural rubber .
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