Lord R M, Mills R P, Abel E W
Medical Engineering Research Institute, University of Dundee, Nethergate, Dundee, UK.
Hear Res. 2000 Jul;145(1-2):141-8. doi: 10.1016/s0378-5955(00)00085-x.
An anatomically shaped incus replica prosthesis has been designed to reconstruct the ossicular chain. A series of in vitro studies on human temporal bones evaluated the acoustic performance of this prosthesis and compared it with a Causse partial ossicular replacement prosthesis (PORP). Pure tones in the frequency range 0. 125-8 kHz stimulated the tympanic membrane at sound pressure levels of 80, 90 and 100 dB. Measurements of the stapes footplate velocity were made with a laser interferometer. The acoustic function of the ossicular chain reconstructed with the incus replica prosthesis was found to be within 10 dB of that of the original intact ossicular chain, when both the upper and lower joints of the implant were rigidly fixed in place. It was shown that a rigid mechanical contact between the ossicular prosthesis and ossicles is a prerequisite for effective sound transmission. The anatomically shaped incus prosthesis gave a 15-dB improvement on the PORP at frequencies below 1.5 kHz.
一种解剖形状的砧骨复制假体已被设计用于重建听骨链。对人类颞骨进行了一系列体外研究，评估了该假体的声学性能，并将其与考斯部分听骨置换假体（PORP）进行了比较。在0.125 - 8kHz频率范围内的纯音以80、90和100dB的声压级刺激鼓膜。用激光干涉仪测量镫骨底板速度。当植入物的上下关节都牢固地固定到位时，发现用砧骨复制假体重建的听骨链的声学功能与原始完整听骨链的声学功能相差在10dB以内。结果表明，听骨假体与听小骨之间的刚性机械接触是有效声音传输的先决条件。在低于1.5kHz的频率下，解剖形状的砧骨假体比PORP提高了15dB。
