Which instrument is best suited for cutting 7-0 nylon suture?

The straight Iris scissors are ideally suited for cutting 7-0 nylon suture due to their fine, pointed blades and precise cutting edge. These scissors are designed for delicate and intricate tasks, making them highly effective for cutting small gauge sutures like 7-0 nylon, which are typically used in microsurgery or delicate tissue repair. The design allows for control and accuracy, which is crucial when cutting such fine materials without causing any damage to the surrounding tissues.

In contrast, the other instruments listed may not provide the same level of precision or appropriateness for such fine suture. Straight Mayo scissors are better suited for cutting heavier tissues rather than delicate sutures. Curved Metzenbaum scissors, while useful for cutting tissues, are typically used for more general surgical tasks and not specifically designed for fine sutures. Curved Stevens tenotomy scissors are used for cutting sutures too, but their curvature might not provide the same precision as the straight Iris scissors when cutting very fine sutures like 7-0 nylon.