[A new multivariable sigmoid sinus and dura retractor].

Retraction of the sigmoid sinus and the dura requires a strong instrument. The instruments currently available allow only a limited degree of freedom due to their lack of mobility and versatility. A new sigmoid sinus retractor (Micro-France/Instrumentarium) was designed to facilitate the surgeon's task by offering the following advantages: Three-dimensional mobility of the blade: lateral, rotatory and longitudinal Safe positioning of the retractor by three sets of sharp teeth Fixation of the blade by a single screw Strong retraction without giving way.