From The Old Republic Wiki

Vibroblades is a type of bladed melee weapon that used ultrasonic vibrations to increase cutting effectiveness. Swords, pikes, knives, and axes all consisted of the same basic design: the weapon's hilt or handle usually contained a compact ultrasonic generator, causing the blade to vibrate at an incredible speed, making even the slightest glancing blow become a gaping wound. It could be fitted with cortosis weave, allowing it to parry the blows of lightsabers and energy swords.