A method for identifying otological drill entanglement with a cotton swab

Figures & data

Figure 1. The modified drill.

Figure 2. The experiment with calvarian bone.

Figure 3. A cotton swab as used in the experiments.

Figure 4. Signals and data processing for normal milling.

Figure 5. Signals and data processing for cotton swab entanglement.

Figure 6. Dynamic relationship for cotton swab entanglement (T₀ = 0).

Figure 7. Dynamic relationship for normal milling (T₀ = 0).

Figure 8. Contact angle between the drill bit and bone.

Figure 9. Dynamic relationship for cotton swab entanglement (T₀ < 0).

Figure 10. Dynamic relationship for cotton swab entanglement (T₀ > 0).

Figure 11. Dynamic relationship for normal milling (T₀ < 0).

Figure 12. Dynamic relationship for normal milling (T₀ > 0).

Figure 13. Structure of the adaptive filter.