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. 2023 Jul 21;13(14):2434. doi: 10.3390/diagnostics13142434

Table 1.

Drill bit sizing and applications to neurological procedures.

Type of Drill Bit Diameter (mm) Maximum Length (mm) Neurological Procedures
1a 2.4 70 Cervical lateral mass screw cannulation
1b 2.4 210 SEPS placement
2a 2.7 70 Natus Camino and Spiegelberg ICP monitors
2b 2.7 210 Brainlab Varioguide biopsy
3 3.2 210 LITT, SEPS placement, regular EVD catheter (3 mm)
4 4.5 70 Raumedic ICP monitor, regular EVD catheter (3 mm), and large EVD catheter (3.3–3.4 mm)
5 * 5.3 70 Hemedex quad-lumen bolt kit, regular EVD catheter (3 mm), and large EVD catheter (3.3–3.4 mm)
6 5.8 70 SEPS procedure, regular EVD catheter (3 mm), and large EVD catheter (3.3–3.4 mm)

Caption: ICP, intracranial pressure; LITT, laser interstitial thermal therapy; EVD, external ventricular drain; SEPS, subdural evacuating port system; *, the specific size that was utilized in the study cohort.