There are several types of cochlear implants, suitable for patients with different types of hearing loss. The most common implants are Bone conduction devices that convert sounds into vibrations that are sent to the inner ear past the outer and middle ears. Middle ear implants that perceive sounds and convert them into vibrations that are sent to the middle ear and then to the inner ear; brainstem hearing implants that convert sounds into signals that are sent to the brain, passing through the auditory nerve.