A totally implantable hearing system – Design and function characterization in 3D computational model and temporal bones

Finite element analysis of the coupling between ossicular chain and mass loading for evaluation of implantable hearing device

“…They also observed that two of three bones showed large peaks and notches at the stapes displacement in the frequency range from 1000 Hz to 3000 Hz. The previous FE model, with perfect coupling between the clip and the bone, did not predict the deep reduction of the FP displacement at mid frequencies from 1000 to 3000 Hz (Gan et al, 2010). However, as shown in Fig.…”

“…7 (a) also displays that there is only a little difference in results for Position L4 and L5. As a comparison, the changes of footplate displacement under a 26 mg magnet obtained by actual measurement reported by Gan et al (2010) are also shown by dashed lines in the same figure. Fig.…”

“…In the implantable CLT described by Hough et al (2000) and Gan et al (2010), the coil was postoperatively seated in the ear canal and the magnet in place beside the incus-stapes joint. Two magnet positions used in this analysis are shown in Fig.…”

“…7. In a recent study, Gan et al (2010) used a novel attachment clip with two separate arms to load magnet onto the ossicles, they reported that the implant mass of 26 mg may cause 4e14 dB loss at midfrequencies (1000e5000 Hz). They also observed that two of three bones showed large peaks and notches at the stapes displacement in the frequency range from 1000 Hz to 3000 Hz.…”

Segmentation and reconstruction of the 3D geometry of the middle and inner ear

“…Optimal designed ossicular prosthesis and cochlear implant electrodes, as well as their precise insertion are possible thanks to the development of computer-aided engineering (CAE) and computer-aided surgery (CAS): design of the ossicular prosthesis and cochlear implant electrodes is greatly simplified by computer-aided design (CAD) [4,5]; afterwards verification and optimization of them are achieved by finite element method (FEM) [6,7,10]; due to the complexity and small scale of the structure of the middle and the inner ear, CAS is usually applied in preoperative surgery planning and navigation during the surgery [8,9].…”