Guillotine performance: duty cycle analysis of vitrectomy systems.

Purpose:To evaluate the duty cycle of different vitrectomy cutters and classify their blade movement.Methods:A precise weighing (0.01 g) high speed (2 samples/s) balance was used to study the 20-gauge and 25-gauge Bausch & Lomb Lightning-Millenium (St. Louis, MO), the 20-gauge (1500 cpm) and the 25-