A vibration investigation of a flat surface contact to skull bone for direct bone conduction transmission in sheep skulls in vivo.
Artikel i vetenskaplig tidskrift, 2013

Hypothesis: Bone conduction implant (BCI) attached with a flat surface contact will offer efficient and linear vibration transmission over time. Background: Despite that percutaneous bone conduction devices (PBCD) are successful in treating patients with conductive hearing loss, there are some drawbacks related to the need of a permanent skin penetration. The BCI system is designed as an alternative to the PBCD because it leaves the skin intact. Methods: BCI dummy implants were installed in 3 sheep skulls in vivo to study the vibration transmission characteristics over time. Mechanical point impedances and vibration transfer response functions of the BCI implants were measured at the time of surgery and after a healing period of 8 months. Results: In 1 sheep both implants healed without complications. In the other 2 sheep, the implants were either partially loose or lost to follow up. In the sheep with stable implants, it was found by the resonance frequency shift of the mechanical point impedance that a firmer integration between the implant and bone tissue as seen in osseointegrated surfaces developed over time. It was also shown that the transcranial vibration transmission remains stable and linear. Providing bone chips in the contact between the implant and the bone did not enhance vibration transmission. The surgical procedure for installing the BCI dummy implants was uneventful. Conclusion: The mechanical point impedances and vibration transfer response functions indicate that the BCI implants integrate and that transmission conditions remain stable over time.

Bone conduction implant

Bone chips

Vibration transmission

Osseointegration

Flat surface contact

Sheep skull

Mechanical point impedance

Författare

Hamidreza Taghavi

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

Bo Håkansson

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

Måns Eeg-Olofsson

Göteborgs universitet

Carina B. Johansson

Göteborgs universitet

Anders Tjellström

Göteborgs universitet

Sabine Reinfeldt

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

Tomas Bergqvist

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

Joakim Olsson

Chalmers, Signaler och system, Signalbehandling och medicinsk teknik, Medicinska signaler och system

Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology

1537-4505 (ISSN)

Vol. 34 4 690-8

Ämneskategorier

Oto-rhino-laryngologi

DOI

10.1097/MAO.0b013e3182877aee

PubMed

23632789