A catheter is a Class II medical machine, a tube inserted into the bladder by the urethra in order to drain urine, mainly used for patients with urinary retention or bladder outlet obstruction, urinary incontinence, patients requiring prolonged bed rest or forced position, and patients in the perioperative period of surgical procedures. Catheters are usually divided into 13 models with specifications ranging from 6F to 30F according to the circumference of the outer diameter, and four models of 12F, 14F, 16F and 18F are commonly used for adults.
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