Multiple lumen sensor attachment

A cranial bolt to be secured to a skull of a patient, comprising:

• a threaded portion having an inner surface forming a central passageway;
• a mating connector disposed on the threaded portion;
• said threaded portion further having an outer surface having a plurality of threads for engaging a hole formed in the skull to fixedly engage the threaded portion to the skull;
• and
• a lumen portion having a centerline, a base part and a stem part designed to enter the central passageway of the threaded portion and engage the mating connector, said base part disposed on one end of the stem part opposite the skull, and at least two lumens disposed through the stem part and the base part and wherein a proximal end of the at least two lumens opens outside the skull and a distal end of the at least two lumens opens inside the skull, wherein, the at least two lumens extend through the stem part and the base part at an angle from the centerline of the lumen portion, said centerline of the lumen extends through the base part and the stem part.