What is the key difference between single-action and double-action jaws?

• A. Single-action has two moving jaws
• B. Double-action has a stationary bottom jaw
• C. Single-action has a stationary bottom jaw
• D. Double-action has special locking mechanism

Answer: (C)

The key aspect that distinguishes single-action jaws from double-action jaws is that single-action jaws have a stationary bottom jaw. In a single-action instrument, the jaw movement is designed so that one jaw is fixed in place while the other moves to clamp or grasp tissue or materials. This mechanism typically allows for a straightforward operation where the motion of one jaw directly engages with the fixed jaw to exert pressure or hold objects securely.

On the other hand, double-action jaws involve a configuration where both jaws can move, which often allows for more complex operations and a greater range of movement. This type of mechanism enables more nuanced handling of tissues and materials.

Understanding this essential difference highlights the mechanical purpose of each type of jaw, reflecting how their design influences surgical techniques and instrument applications.