Abstract
A hearing aid anchoring fixture (104) for anchoring a direct bone conduction hearing aid (108) to the skull bone (106), comprising a threaded portion (110) that has at least one cutting edge (118). Each cutting edge (118) has an adjacent cavity (120) having a volume Vc. The threaded portion (110) has a thread depth dt being half of the difference between the maximum outer diameter d1 of the threaded portion (120) and the inner diameter d2 of the thread, where dt is at least 10% of the maximum outer diameter d1 of the threaded portion (110) and where dt is less than 20% of the maximum outer diameter d1 of the threaded portion (110). The fixture (104) may be equipped with a flange portion (114) that has an outer diameter d3 being greater than the maximum diameter d1 of the threaded portion (110).
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