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CROS aid

How does the CROS aid work?

A CROS aid (Contralateral Routing Of Signal) is made up of two parts – a microphone (transmitter) and a hearing aid (receiver). Patients wear the transmitter on the deaf ear and the receiver on the hearing ear. Sound is transmitted via a wire connecting each unit. As with the BAHA device, the time delay associated with the transmission helps the user to distinguish the direction of the sound.


Who can get a CROS aid?
Patients with total hearing loss in one ear are eligible for the CROS aid. If a person also has a degree of hearing loss in the other ear, both sides of the CROS aid can be fitted with an amplifier, creating what is known as a “BICROS” aid.
CROS aids are available throughout the UK at almost every audiology department of major NHS Trusts.


Advantages of the treatments


Advantages of BAHA Advantages of CROS aid

• Better Sound quality than
CROS aid (proven in clinical testing)
• Discreet and can easily be hidden in the hair
• Does not occlude the
other hearing ear
• No wires


• No surgical procedure required

Disadvantages of the Treatments


Disadvantages of BAHA Disadvantages of CROS aid

• A small surgical procedure is required to insert the tiny (4mm) titanium implant

• Occludes Hearing ear
• Often has an external wire linking the two parts
• Is clearly visible


Link to BAHA

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