Brainlab CRANIAL/ENT OPTICAL User Manual page 66

Attaching Arm to Headholder
Ensuring Correct Attachment
When attaching the Vario Reference Arm for Mayfield Headholder to the V-inset or headholder,
make sure that the teeth on both components are properly interlocked, and that the surfaces are
parallel to each other.
No.
①
②
After Registration
Following registration you can drape the patient and attach the sterile Standard Cranial
Reference Array using the same procedure described for the Reference Clamp Universal.
During Use
Warning
Once the Vario Reference Arm for Mayfield Headholder has been mounted, do not change
the position by readjusting the central tension handle or the Mayfield "T" Screw. This could
damage the drape, and compromise the sterility and referencing accuracy.
Warning
Do not unscrew the Mayfield "T" screw and/or the central tension handle after patient
registration. The entire coordinate system will no longer be accurate and the instrument tip
incorrectly displayed. Only the fixation nut may be unscrewed to exchange the Standard
Cranial Reference Array.
Warning
Do not move the Mayfield marker array relative to the patient's anatomy during later
procedures as this would improperly affect the entire measurement coordinate system and
lead to an incorrect display of the instrument's tip.
NOTE: Tightly close the central tension handle to prevent unintentional loosening. The Vario
Reference Arm for Mayfield Headholder has a limited load capacity. Do not load the Vario
Reference Arm for Mayfield Headholder with too much weight (i.e., do not lean on it, or place
instrumentation on it).
NOTE: Keep the central tension screw tightened during registration and navigation to protect the
inner mechanism from liquids.
66
①
Explanation
Teeth correctly aligned
Teeth incorrectly aligned
②
Figure 28
Instrument User Guide Rev. 2.3 Cranial/ENT Optical