DEVICE: Em Disposable Stylet (04056481006525)

An assembly of electromechanical devices used during orthopaedic computer assisted surgery (CAS) as a functional extension of the surgeon for precise procedural movement and placement (navigation) during the procedure (e.g., placement of a pedicle screw in spinal surgery). It is computer-based and typically consists of, e.g., an operator's console and a video camera used to track the instrumentation. The input to the computer is usually by means of an existing CT or MRI scan that is used as a template. The system tracks the instrumentation by reading the location points giving a three-dimensional (3-D) picture of the instrument's position/angulation. It can also be used as a training aid.

A sterile, invasive, flexible wire with an electromagnetic (EM) coil transmitter at the distal end designed to be inserted into an intracranial catheter to help guide the surgical insertion of the catheter through the skull for placement in the brain. It is proximally connected to a line-powered EM neurosurgical navigation system which tracks and displays the position of the stylet for precise navigation during the procedure. This is a single-use device.