Sigmoidoscopes are medical instruments used to examine the lower part of the large intestine, also known as the sigmoid colon. They consist of a rigid or flexible tube with a lens and light at the end, allowing the physician to visualize the colon's interior. Sigmoidoscopes can be used for diagnostic and therapeutic purposes, such as finding the cause of rectal bleeding, identifying abnormal growths, and removing foreign objects.
There are two main types of sigmoidoscopes: flexible sigmoidoscopes and rigid sigmoidoscopes. Flexible sigmoidoscopes are more commonly used in clinical practice, as they are more comfortable for the patient and easier to maneuver. Rigid sigmoidoscopes are typically used for more invasive procedures, such as biopsy or removal of polyps.