Potential nerve damage following contact with a piezoelectric device.

Objectives: The aim of the study was to assess the extent of the potential nerve damage following prolonged contact with a piezoelectric device.
Methods: The study was conducted with 30 patients; all of the patients had cervical metastatic lymph nodes at levels II, III, and IV (N2b) and a negative evaluation for metastatic disease (MO). The patients underwent radical neck dissection. After its skeletonization, the spinal nerve was exposed directly to ultrasonic activation with a piezoelectric device for various times (5, 10, and 20 seconds) and with different inserts (OP3 insert and OT7 insert). The axonal damage was graded from 0 to 3 as follows: 0, no damage; 1, minor axonal damage; 2, severe axonal damage but not covering the entirety of the nerve fascicles; 3, severe axonal damage covering the entirety of the nerve fascicles.
Results: Histologic examination showed no evidence of damage to the perineurium and axons after 5 and 10 seconds of exposure to ultrasonic activation with each insert.
Conclusions: Our histologic data highlight the selective action of the piezoelectric device, which reduces the risk of accidental nerve damage in otolaryngological bone surgery.