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Original Article

Effects of applied contact force and volume control setting on output force levels of the BAHA® Softband

Efectos de la fuerza aplicada de contacto y de los ajustes en el control de volumen sobre los niveles de fuerza de salida del BAHA® Softband

, &
Pages 301-308 | Published online: 07 Jul 2009
 

Abstract

The BAHA® Softband has been developed to provide a transcutaneous anchor for a BAHA® until a child is a surgical candidate for the percutaneous BAHA® implant. We tested the objective output force level of the BAHA® Classic 300 and Compact connected to a Softband on an artificial mastoid to determine: (1) the effects of direct contact force on output force levels (dB); and (2) the required volume control setting to ensure audibility of speech (assuming an average adult reference equivalent threshold force level).

Direct contact force was varied from 2 to 5 N in 1 N steps. Output force level increased with increasing contact force. However, the average increase was 3 dB or lower, suggesting that the contact force is of minor importance. Volume control setting appears to be of much greater importance. It is suggested that the volume setting of either device be set to at least 2.5 to ensure audibility of conversational speech. Data from normal-hearing adults with simulated conductive hearing losses are presented to validate this conclusion.

Acronyms
SPL=

Sound pressure level

OFL=

Output force level

PLL=

Preferred listening level

RETFL=

Reference equivalent threshold force level

BAHA=

Bone-anchored hearing aid

N=

Newtons

Acronyms
SPL=

Sound pressure level

OFL=

Output force level

PLL=

Preferred listening level

RETFL=

Reference equivalent threshold force level

BAHA=

Bone-anchored hearing aid

N=

Newtons

Sumario

El BAHA® Softband (implante osteo-integrado con banda suave) ha sido desarrollado para aportar un anclaje transcutáneo para el BAHA® hasta que un niño sea un candidato quirúrgico para la implantación de un BAHA® percutáneo. Evaluamos el nivel objetivo de la fuerza de salida del BAHA® Classic 300 y del Compact conectados a un Softband sobre un mastoides artificial para determinar: (1) el efecto de la fuerza de contacto sobre los niveles de la fuerza de salida (dB), y (2) el ajuste requerido en el control de volumen para asegurar la audibilidad del lenguaje (asumiendo un nivel promedio de fuerza umbral equivalente de referencia para el adulto). La fuerza directa de contacto se varió de 2 a 5 N en pasos de 1 N. El nivel de la fuerza de salida se incrementó con el aumento en la fuerza de contacto. Sin embargo, el incremento promedio fue de 3 dB o menos, lo que sugiere que la fuerza de contacto tiene menor importancia. El ajuste en el control de volumen parece ser de mucha mayor importancia. Se sugiere que el ajuste de volumen de ambos dispositivos deba ser colocado al menos en 2.5, para asegurar la audibilidad de una conversación. Para validar esta conclusión, se presenta información de adultos normo-oyentes con hipoacusia conductiva simulada.

Notes

1. The Softband was conceived by Professor Cor Cremers, University Hospital, Nijmegen, the Netherlands

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