Which self-retaining retractor is used to keep the mouth open during tonsillectomy procedures?

The McIvor retractor is specifically designed for use in oral procedures, such as tonsillectomies. Its unique design provides the ability to hold the mouth open effectively, allowing the surgeon adequate visibility and access to the tonsils. This is crucial during tonsillectomy, as it facilitates a clear field of view and optimizes the safety and efficiency of the procedure.

In contrast, the other retractors mentioned serve different purposes. The Davis retractor is traditionally used for retracting skin and deeper tissues during various surgical procedures but is not tailored for oral cavity access. The Bookwalter retractor is a versatile system designed predominantly for abdominal and pelvic surgeries, providing retraction of large incisions. The Richardson retractor is primarily used in abdominal surgeries as well, focusing on deeper tissue retraction rather than oral access. Therefore, the McIvor retractor stands out as the most appropriate tool for maintaining an open mouth during a tonsillectomy, ensuring optimal surgical conditions.