US Patent 6964642 Apparatus for bone conduction threshold hearing test

An apparatus for bone conduction hearing testing is provided. The apparatus comprises a planar spring having opposed first and second elements to which are coupled, respectively, a bone conduction vibrator and an engagement element. The bone conduction vibrator contacts a first head portion, preferably the forehead, and the engagement element contacts a second head portion, preferably the rear of the head. The spring preferably has a lenticular shape, and may be either biconvex or D-shaped.