Method for fixing a vibrating acoustic emitter in a bone conduction hearing aid to minimize sound ener-gy loss

Introduction. This paper addresses the pressing challenge of developing effective bone conduction hearing aids. Existing methods for securing vibrating acoustic emitters in such devices have several drawbacks, including unstable connections, sound energy loss, and limited options for individual adjustments. The aim of this study is to design a fixation device for a vibrating acoustic emitter in a bone conduction hearing aid and examine how the pressure connection parameters in the "sound emitter – ear implant" system affect the quality of the transmitted sound. Technical Features of the Fixation Device. A novel fixation device has been developed, incorporating a titanium implant and a polymer ring. This design allows for adjustable pressure between the emitter and the bone, ensuring a secure and stable connection. Additionally, a personalized approach to abutment design—utilizing a parametric computer model created in a three-dimensional design system (such as Compass3D©)—optimizes prosthesis geometry for individual patients. Results. The amplitude-frequency response (AFR) and phase-frequency response (PFR) were measured for two prototype designs: a screw implant with spherical abutments and a screw implant with a vibration-conducting platform. Experimental analysis demonstrated that the proposed innovative fixation method eliminates AFR dips at mid frequencies, which is crucial for speech perception, smooths AFR and PFR curves, resulting in a more natural and balanced sound, reduces AFR nonlinearity by more than 6 dB (17%). Conclusion. The proposed fixation device exhibits high efficiency and significant potential for application in bone conduction hearing aids. Future research will focus on assessing the long-term stability of the system and developing customized solutions tailored to individual patients' needs.