Also known as a rectoscope, a proctoscope is a medical instrument used to open and look into the anal cavity, rectal cavity or sigmoid colon. This procedure is usually carried out to check for haemorrhoids or other similar discomforts. The obturators are designed so that their rounded end protrudes through the far opening of the instrument, allowing for an easier, more comfortable insertion into the anus. The obturator is then removed, allowing easy viewing into the cavity.