Endoscopy, is the examination of internal body cavities using a specialized medical instrument called an endoscope. Physicians use endoscopy to diagnose, monitor, and surgically treat various medical problems. An endoscope is a slender, flexible tube equipped with lenses and a light source. Illumination is done by the help of a number of optical fibres. Reflected light rays are collected by CCD( Charge coupled device) and electrical signals are produced, which are fed to the video monitor to get image. Thorough one channel of endoscope water and air is conducted to wash and dry the surgical site.