Blog 2018-4: Unsubstantiated claimed ‘equivalence’ of newly introduced BCDs (bone-conduction devices) to established BCDs

Introduction. Originally, (conventional) bone-conduction devices (BCDs) comprised a bone vibrator pressed against the skin in the mastoid region. This so-called transcutaneous coupling works, but is not effective at all. Therefore, these conventional BCDs needed very powerful amplifiers. Nevertheless, the gain and output was limited and these devices were only applied if there was no acceptable alternative, thus as a ‘last resort’ solution (e.g. in case of aural atresia or chronic draining Read more [...]

Blog 2018-2: How to quantify the gain (amplification) of a bone-conduction device; comment to the systematic review by Bezdjian et al. (2017)

During the last decades, several new types of bone-conduction devices (BCDs) have been released for patients with conductive or mixed hearing loss. One rather recent innovation is the semi-implantable (transcutaneous) Sophono device (Medtronic; Jacksonville, Fl, USA), which is based on the Otomag device (Siegert et al., 2013; chapter 2, this website). This device makes use of a transcutaneous magnetic coupling between the externally worn conventional BCD and the skull. Recently, Bedzjian et al. (2017) Read more [...]

Blog 2018-1: Implantable transcutaneous bone conductors or percutaneous bone conductors; a free choice? Review of the paper by Cedars et al., 2016

The Baha bone-conduction device (BCD) was developed in the eighties for patients with conductive and mixed hearing loss. When this device is percutaneously coupled, the BCD is a powerful hearing solution (see Chapters 2 and 3, this website) and is generally considered as the gold standard. However, in a number of patients, problems occurred with the skin around the percutaneous implant. Although well manageable in adults (Chapter 5, this website) this has lead to revision surgeries, most frequently Read more [...]