The Mayo-Hegar is a surgical instrument commonly used in various medical procedures, particularly in gynecology and obstetrics. It is a type of clamp designed to grasp and hold tissues securely during surgery. The instrument features a ratchet mechanism that allows for easy locking and unlocking, providing surgeons with better control. This clamp is named after two prominent figures in the field of medicine, Dr. Charles Mayo and Dr. John Hegar, who contributed to its development. The Mayo-Hegar is essential for tasks such as suturing and tissue manipulation, making it a vital tool in surgical settings.