What is the difference between bone conduction hearing aid and air conduction hearing aid?

Air conduction refers to the process that sound is transmitted from air to the inner ear through the outer ear and middle ear. This is a normal auditory pathway. If there are obstacles in this way, the most common is that the eardrum is seriously damaged or completely broken, so it is necessary to improve hearing by bone conduction. Hearing aid is an auxiliary device used by hearing impaired people to make up for the defects caused by hearing impairment. Tools, equipment, devices and instruments to improve communication ability with others. Broadly speaking, all kinds of devices that can effectively transmit sound to the ears can be regarded as hearing AIDS. In a narrow sense, a hearing aid is an electroacoustic amplifier, through which deaf people can hear sounds that they can't hear clearly. This device is a hearing aid.