Coil-reinforced tubing is a type of medical tubing that is reinforced with a spiral-shaped wire or coil. The wire or coil is typically made of stainless steel, although other materials can be used as well, and is embedded within the wall of the tubing. The purpose of the reinforcement is to improve the tubing's resistance to kinking, crushing, and collapse, while still allowing the tubing to bend and flex during use. Coil reinforced tubing is commonly used in medical devices and procedures where flexibility and kink resistance are important, such as endoscopy, urology, and interventional radiology.