Catheters are flexible tubes used in medical procedures to facilitate the movement of fluids into or out of the body. Commonly used for urinary drainage, they help patients unable to naturally pass urine due to surgery, illness, or injury. Catheters are also essential in cardiac catheterization for diagnosing and treating heart conditions. Available in various types, including Foley and intravenous, they meet diverse medical needs. Key health-related keywords include urinary catheterization, fluid drainage, medical device, cardiac catheterization, patient care, and procedure.