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Updated: Apr 25, 2026
Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
Published on: August 18, 2023
Definition of metrics to evaluate cochlear array insertion forces performed with forceps, insertion tool, or
Yann Nguyen1, Guillaume Kazmitcheff2, Daniele De Seta3
1Otolaryngology Department, Unit of Otology, Auditory Implants and Skull Base Surgery, Hospital Pitié Salpêtrière, 47-83 Boulevard de l'Hôpital, Cedex 13, 75651 Paris, France ; Sorbonne University, "Minimally Invasive Robot-Based Hearing Rehabilitation", UPMC Univ Paris 06, UMR S 1159, 75005 Paris, France ; INSERM, "Minimally Invasive Robot-Based Hearing Rehabilitation", UMR S 1159, 75018 Paris, France.
Comparing three cochlear implant array insertion techniques, a motorized tool demonstrated a smoother force profile, though overall force momentum did not differ significantly between methods. This suggests improved predictability for inner ear trauma reduction.
Area of Science:
- Otolaryngology
- Biomedical Engineering
- Neurosurgery
Background:
- Minimizing inner ear trauma during cochlear implant array insertion requires controlled insertion forces.
- Evaluating different insertion tools is crucial for optimizing surgical techniques.
Purpose of the Study:
- To compare insertion forces of a lateral wall electrode array using three techniques: forceps, a commercial tool, and a motorized tool.
- To assess the force profiles and momentum during array insertion into anatomical specimens.
Main Methods:
- Temporal bones were mounted on a 6-axis force sensor to measure insertion forces.
- Array insertion was performed using each of the three techniques in random order.
Main Results:
- Manual forceps and commercial tool insertions exhibited jerky movements.
- Motorized tool insertion showed a gradual force increase, primarily at the end of insertion.
- Overall force momentum was comparable across all three insertion techniques.
Conclusions:
- While overall force momentum was similar, the motorized tool offered a more predictable insertion force profile.
- A smoother force rise with the motorized tool may contribute to reduced inner ear trauma.
