Development of Measurement method of Stapes Mobility

在鼓室成形术中，评估距骨的活动度是很重要的，因为它在很大程度上影响着预后听力水平的程度。然而，目前还没有一种实用的、客观的测量方法来测量月骨移动性。在本研究中，该传感器是用来测量距骨的位移和反作用力。利用该传感器对豚鼠和人工固定的豚鼠和兔的踝关节活动度进行了测量，并对其客观诊断方法进行了探讨。此外，还尝试了用手持传感器测量临床使用的踝关节活动度。结果表明：1.反力在小位移区呈线性增加，而在大位移区呈非线性增加。结果：1.正常豚鼠和兔在小位移区的月骨刚度分别为16[+]7N/m和115[-+]25N/m。经CM测量证实，人工固定与正常胫骨的僵硬程度有显著差异，与实际固定相近。这些结果表明，该测量系统可用于诊断胫骨内固定。虽然拿着传感器在0.02秒内测量了距骨的活动度，但刚度曲线与静态测量的结果吻合得很好。在0.02秒内测量距骨活动度不受耳蜗和韧带粘性及手部颤动的影响，之后将利用微机械加工技术制作一种更小的临床使用装置。

It is important to evaluate the stapes mobility in tympanoplasty because it largely affects the degree of the prognostic hearing level. However, the practical objective measurement method of the stapes mobility has not been well established. Within the present study, the sensor was made to measure the displacement and reaction force of the stapes. The stapes mobility of guinea pigs and rabbits with normal and artificially fixed stapes were measured using this sensor, and the objective diagnosis method was discussed. Moreover, an attempt was made to measure the stapes mobility with the sensor held in hand for clinical use. The results could be drawn as follows :1. The reaction force increases linearly in the small displacement region, but nonlinearly in the large displacement region. The stiffnesses of the normal stapes of guinea pigs and rabbits in small displacement region were 16 【minus-plus】 7N/m and 115 【minus-plus】 25N/m, respectively.2. The significant difference was found between the stiffness of the normal and artificially fixed stapes, which as confirmed to be similar to realistic fixation by the CM measurement. These results indicated that this measurement system could be used for diagnosis of the stapes fixation.3. Although the stapes mobility was measured within 0.02 sec with the sensor held in hand, the stiffness curves well agreed with those in static measurement. The measurement of the stapes mobility within 0.02 sec did not be affected by the viscosity of the cochlea and ligament and the hand trembling.After this, a smaller device for clinical use will be made using micromachining technique.