Browning G G
Department of Otolaryngology, Royal Infirmary, Glasgow.
J Laryngol Otol. 1990 Jul;104(7):534-8. doi: 10.1017/s0022215100113106.
Implantable bone conduction aids are potentially an important advance for those with a conductive hearing impairment. One system (Xomed Audiant bone conductor), which uses electromagnetic induction to vibrate a subcutaneous implanted skull magnet, has now been implanted in sufficient patients in the United Kingdom, for enough time, for its indications to be evaluated. Seventeen of the total of 18 patients that have been implanted, satisfied the average threshold criterion for suitability for implantation (average bone conduction over 0.5, 1 and 2 kHz of 25 dB HL or better) yet only 10 of the 17 (59 per cent) currently use their Audiant aid. This was not because of technical reasons but was mainly influenced by the previous type of amplification. Current usage of a body level processor was 100 per cent) (6 of 6) in those that previously could only use a conventional bone conduction aid because of bilateral congenital or acquired atresia of their external auditory canals. In comparison, usage was only 36 per cent (4 of 11) in those that could potentially use a conventional ear level aid albeit with problems such as the discharge from active chronic otitis media. This relative non-use was considered due to a lack of power of the ear level processor and the general unwillingness of patients to change from an ear level to a body level device.
可植入式骨传导助听器对于传导性听力障碍患者来说可能是一项重要进展。一种利用电磁感应使皮下植入的颅骨磁体振动的系统（Xomed Audiant骨传导器），目前已在英国有足够数量的患者中植入了足够长的时间，以便对其适应证进行评估。在总共18例已植入的患者中，有17例满足植入适宜性的平均阈值标准（0.5、1和2千赫兹频率处的平均骨导听阈为25分贝听力级或更好），但在这17例患者中，目前只有10例（59%）使用他们的Audiant助听器。这并非技术原因导致，主要受先前放大类型的影响。对于那些因双侧先天性或后天性外耳道闭锁而此前只能使用传统骨传导助听器的患者，目前身体佩戴式处理器的使用率为100%（6例中的6例）。相比之下，对于那些尽管存在诸如慢性化脓性中耳炎流脓等问题但有可能使用传统耳背式助听器的患者，使用率仅为36%（11例中的4例）。这种相对不使用的情况被认为是由于耳背式处理器功率不足以及患者普遍不愿意从耳背式设备转换为身体佩戴式设备所致。
