A Senn retractor is a small, handheld surgical instrument commonly used in medical and surgical procedures to hold back tissues and organs, providing better visibility and access to the surgical area. It features a double-ended design, with one end being a small, curved, blunt blade and the other end having a rake-like structure with three sharp or blunt prongs. This versatile tool is essential for various types of surgeries, including orthopedic, plastic, and general surgeries.