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Updated: Jan 10, 2026
Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
Published on: August 18, 2023
A novel, tissue-selective burr for temporal bone drilling
Laura Ihalainen1,2, Matti Iso-Mustajärvi3,4, Pia Linder3
1Department of Otorhinolaryngology, Kuopio University Hospital, Kuopio, PO Box 100, 70029, Finland. laura.ihalainen@pshyvinvointialue.fi.
Purpose:
Temporal bone (TB) drilling is one of the most frequently performed otologic procedures. It carries the potential risk of damage to the facial nerve, sigmoid sinus, and dura. Conventional cutting burrs (CCBs) are effective at cutting bone but may easily cause soft tissue damage. A novel 5.4-mm cutting burr, the Safety Burr (SB), with a moving, self-centering ring placed around the cutting tip, was developed as a safety mechanism to prevent soft tissue injuries.
Methods:
The SB was compared to the 5.0 mm CCB in 20 cadaveric fresh-frozen TBs. The contact time and number of inadvertent errors were recorded. The assessments of the three otosurgeons on burr characteristics were graded on a scale of 1 (poor) to 5 (superior). Soft-tissue protection was further evaluated in three cadaveric heads.
Results:
No differences were observed in the mean procedure time between the SB and the CCB. The SB was perceived to be superior to the CCB in terms of soft tissue protection, absence of jumping, and precision. In the cadaveric heads, drilling on the exposed middle fossa dura or sigmoid sinus resulted in no tearing or perforation.
Conclusion:
The SB is a feasible alternative for TB drilling and provides soft-tissue protection. The absence of jumping contributed to superior handling and controllability of the burr. Further clinical studies are needed to comprehensively assess the tissue selectivity and its limitations in otological TB drilling.
