Table 1.
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.