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Abstract
One limitation with the Bone Anchored Hearing Aid (Baha®) is too poor amplification for patients with moderate to severe sensorineural hearing losses. Therefore, we investigated if bone conducted (BC) sound transmission improves when the stimulation approaches the cochlea. Also the influence from the squamosal suture on BC sound transmission was investigated. Both sides of the heads on seven human cadavers were used and vibrational stimulation was applied at eight positions on each side with a frequency range of 0.1–10 kHz. A laser Doppler vibrometer was used to measure the resulting velocity of the cochlear promontory. It was found that the velocity of the promontory increases as the stimulation position approaches the cochlea; this was especially apparent at distances within 2.5 cm from the ear canal opening and when the stimulation position was in the opened mastoid. At frequencies above 500 Hz there was on average 10 to 20 dB greater vibrational response at the cochlea when the stimulation was close to the cochlea compared with the normal Baha® position. Moreover, even if there were general indications of attenuation of BC sound when passing the squamosal suture, an effect from the suture could not be conclusively determined.
| Abbreviations | ||
| AC | = | Air conduction |
| Baha | = | Bone-Anchored Hearing Aid |
| BC | = | Bone conduction |
| CSF | = | Cerebrospinal fluid |
| ISQ | = | Implant stability quotient |
| LDV | = | laser Doppler vibrometer |
| MAPP | = | Mastoid surface area that attaches to the petrous part of the temporal bone |
| PTA | = | Pure tone average |
| RFA | = | Resonance frequency analysis |
| SNR | = | Signal-to-noise ratio |
| Abbreviations | ||
| AC | = | Air conduction |
| Baha | = | Bone-Anchored Hearing Aid |
| BC | = | Bone conduction |
| CSF | = | Cerebrospinal fluid |
| ISQ | = | Implant stability quotient |
| LDV | = | laser Doppler vibrometer |
| MAPP | = | Mastoid surface area that attaches to the petrous part of the temporal bone |
| PTA | = | Pure tone average |
| RFA | = | Resonance frequency analysis |
| SNR | = | Signal-to-noise ratio |
Sumario
Una limitante del auxiliar auditivo osteo-integrado (Baha®) es la muy pobre amplificación en pacientes con pérdidas neurosensoriales moderadas a severas. Por esto investigamos si la transmisión sonora por vía ósea mejora cuando la estimulación se acerca a la cóclea. También se investigó la influencia de la sutura escamosa en la transmisión del sonido por vía ósea. Se usaron ambos lados de la cabeza de siete cadáveres humanos y se aplicó estimulación vibratoria en ocho posiciones de cada lado con rango de frecuencias de 0.1–10 kHz. Se usó un vibrómetro Doppler laser para medir la velocidad resultante del promontorio. Se encontró que esa velocidad aumenta conforme la posición de la estimulación se acerca a la cóclea; esto fue especialmente aparente a distancias dentro del rango de 2.5 cms de la apertura del conducto auditivo y cuando la posición de estimulación fue en la mastoides abierta. En frecuencias sobre 500 Hz se da una respuesta vibratoria en la cóclea que es de 10 a 20 dB mayor en promedio, cuando la estimulación fue más cercana a la misma y en comparación con la posición normal del (Baha®). Más aún, incluso si existieron indicaciones generales de atenuación del sonido por vía ósea al pasar la sutura escamosa, el efecto de la propia sutura no puede determinarse de manera concluyente.
Notes
1An anti-resonance is here defined as a significant and narrow-band decrease of the vibration response.