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极重度听力损失患者需要考虑三个方面的因素 - 上海助听器-瑞士峰力助听器验配服务中心5折起

极重度听力损失患者需要考虑三个方面的因素

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1 极度重听力损失特点

极重度听力损失重要特点是:听力损失不公表现在灵敏度下降方面,而且影响到处理各种声音的能力;虽然可听到声音但不能有效地从信号中提取有用信息。

2 处理方法

在过去,只有线性助听器才能提供所需要的增益(50~70 dB)和声输出(130~ 140 dB SPL )来满足患者所需。因此很多佩戴10~30年助听器的患者使用的是线性功率助听器,该助听器采用削峰这种直接的输出限制方式。近些年,一些功率高质量助听器进入市场,使用的是更清晰的输出控制电路。输出压缩系统的设计是通过高度压缩信号的方式限制放大量和接收器的电大声输出。这种压缩方式的优点是在限制时不会引入削峰产生的失真。但是临床表明功率助听器使用者对这种压缩系统带来的看似更好的效果却反应并不良好。因为小的失真可以保证良好的信号质量只是听力正常人的观点,而压缩则改变了功率助听器使用者习惯多年声音的性质。另外,采用声输出限制压缩在增益和输出处减小1~2 dB ,而这个微小的变化会对有些极重度听力损失患者带来收听上的影响。

2.2 非线性放大

全自动非线性放大患者对轻声言语信号获得更好的可听度,对中等及强声提供更好的声音质量,随着听力损失的加剧,相应地需要增加增益和压缩将全范围的言语放入到残余动态范围中。按此类推,将整个言语范围放入到极重度听力损失中。140

 

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