A catheter is a thin, flexible tube that is inserted into the body for a variety of medical purposes, such as draining urine from the bladder, administering medication, or delivering fluids directly into a vein. Catheters are commonly used in hospitals, doctor's offices, and other medical settings for diagnostic and treatment purposes. Research in the field of catheters focuses on developing new materials and technologies to improve the safety, effectiveness, and comfort of catheter use, as well as reducing the risk of complications and infections associated with their use. This research area plays a critical role in advancing medical care and improving patient outcomes.