Final answer:
The disposable blades for the new quad tendon harvester have a depth of 15mm, based on the newer medical research suggesting a depth of up to 15 diameters for such instruments. The correct answer is A. 15mm.
Step-by-step explanation:
The disposable blades for the new quad tendon harvester designed for surgical use are available in widths of 9, 10, and 11mm. According to newer medical research, which suggests up to 8 diameters side-to-side and 15 diameters deep for such instruments, the depth of these disposable blades can therefore be estimated. For a width of 11mm, the deepest blade based on this rule would be 11mm x 15, which equates to 165mm.
However, the given options for depth are 15mm, 20mm, 25mm, and 30mm. So, in the context of these options and not exceeding the maximum suggested depth, option A (15mm) is the closest correct depth for these blades. The correct answer is A. 15mm.