Abstract: A middle ear prosthesis device includes an elongated prosthesis member having first and second ends. A transducer clamp is at the first end with clamping fingers for securely engaging the outer surface of an enclosed mechanical signal transducer. An ossicle fastener is at the second end for secure attachment to the ossicle of the middle ear. The ossicle fastener includes parallel planar fastener clips each having a clover shape with springy lobes surrounding an interior region defined by lobe connecting bends. There is an opening between opposing bent leg ends of each fastener clip that displaceably provides access for the ossicle to the interior region of the clip so that the fastener clips securely enclose an ossicle such as the incus bone within the interior region. Vibration of the mechanical signal transducer is coupled by the prosthesis member to the incus secured within the ossicle fastener.