Division of Signal Processing and Biomedical Engineering, Department of Signals and Systems, Chalmers University of Technology, Göteborg, Sweden.
Otol Neurotol. 2013 Jun;34(4):690-8. doi: 10.1097/MAO.0b013e3182877aee.
Bone conduction implant (BCI) attached with a flat surface contact will offer efficient and linear vibration transmission over time.
Despite that percutaneous bone conduction devices (PBCD) are successful in treating patients with conductive hearing loss, there are some drawbacks related to the need of a permanent skin penetration. The BCI system is designed as an alternative to the PBCD because it leaves the skin intact.
BCI dummy implants were installed in 3 sheep skulls in vivo to study the vibration transmission characteristics over time. Mechanical point impedances and vibration transfer response functions of the BCI implants were measured at the time of surgery and after a healing period of 8 months.
In 1 sheep both implants healed without complications. In the other 2 sheep, the implants were either partially loose or lost to follow up. In the sheep with stable implants, it was found by the resonance frequency shift of the mechanical point impedance that a firmer integration between the implant and bone tissue as seen in osseointegrated surfaces developed over time. It was also shown that the transcranial vibration transmission remains stable and linear. Providing bone chips in the contact between the implant and the bone did not enhance vibration transmission. The surgical procedure for installing the BCI dummy implants was uneventful.
The mechanical point impedances and vibration transfer response functions indicate that the BCI implants integrate and that transmission conditions remain stable over time.
附着于平面接触的骨传导植入物（BCI）将随着时间的推移提供高效且线性的振动传输。
尽管经皮骨导装置（PBCD）在治疗传导性听力损失患者方面取得了成功，但仍存在一些与需要永久性皮肤穿透相关的缺点。BCI 系统被设计为 PBCD 的替代品，因为它不会破坏皮肤的完整性。
BCI 模拟植入物被植入 3 只绵羊颅骨内进行体内研究，以研究随时间推移的振动传输特性。在手术时和 8 个月的愈合期后，测量了 BCI 植入物的机械点阻抗和振动传递响应函数。
在 1 只绵羊中，两个植入物均无并发症愈合。在另外 2 只绵羊中，植入物要么部分松动，要么因随访而丢失。在植入物稳定的绵羊中，通过机械点阻抗的共振频率偏移发现，随着时间的推移，植入物与骨组织之间会形成更牢固的整合，就像在骨整合表面上看到的那样。还表明，颅间振动传输保持稳定且线性。在植入物和骨之间的接触处提供骨屑并没有增强振动传输。安装 BCI 模拟植入物的手术过程顺利。
机械点阻抗和振动传递响应函数表明，BCI 植入物会随着时间的推移而整合，并且传输条件保持稳定。
