The Harmonic Scalpel and Ligasure (Covidien) devices are commonly used in head and neck surgery. 
Harmonic Scalpel
The Harmonic Scalpel and Ligasure (Covidien) devices are commonly used in head and neck surgery. 
Ligasure (Covidien)
A systematic review of the literature was performed with subsequent meta-analysis of seven studies that compared the use of haemostatic devices to traditional scalpel and cautery in parotidectomy. 
Meta-analysis