Bone-anchored hearing systems (BAHS) are designed to use your body’s natural ability to transfer sound through bone conduction.1

ear diagramThe sound processor picks up sound, converts it into vibrations, and sends it through your skull bone, directly to your inner ear. This bypasses any problems in your ear canal or middle ear.

Sophono™ offers more sound amplification (gain) than any other magnetic transcutaneous system!2 Designed with your safety in mind -- The Alpha 2 MPO™ system provides the highest functional gain, accompanied by outstanding sound quality3 and compared to an abutment system, Sophono™ performs better at higher frequencies that are so important for speech recognition.4,5,6 Sophono™ can offer patients better speech comprehension and quality of life!7,8

Whether your hearing loss was sudden, gradual or you were born with it, it can leave you feeling isolated and frustrated, but you are not alone. One in eight people in the United States (13 percent, or 30 million) aged 12 years or older has hearing loss in both ears, based on standard hearing examinations.9

Traditional hearing aids offer benefits for many people, while others may need more advanced treatment or a combination. The Sophono™ magnetic bone conduction hearing system from Medtronic is suitable for patients with conductive hearing loss, mixed hearing loss, and single-sided deafness. Read more about each of the indications for the Sophono™ Alpha 2 MPO™ magnetic bone-anchored hearing system (BAHS) below and consult your physician to see if Sophono™ is right for you.

Conductive Hearing Loss

What it is: The damaged outer or middle ear is bypassed by placing sound reception directly onto the skull and to the inner ear.

Causes: Middle ear problems such as middle ear infections, otosclerosis, head injuries that damage middle ear bones or birth defects.

Symptoms: Generally ranges from mild to moderately-severe hearing loss. You may have a "plugged" feeling in your ears, but your own voice may sound louder.

Treatment: Depending on the degree of loss, a traditional aid may work as well as the abutment-free Alpha 2 MPO™ magnetic bone-anchored hearing system (BAHS).

Mixed Hearing Loss

What it is: The middle or inner ear may no longer process sound. The bone of the skull directs sound to the cochlea. It is usually a combination of conductive and sensorineural (nerve damage) hearing loss.

Causes: Mixed Loss can be caused by a combination of disorders including middle ear, and/or damage to the inner ear structures (cochlea) or to the auditory nerve pathway.

Symptoms: Can range from mild to a profound (deaf) hearing loss. Sound volume is softer and sounds are often distorted or difficult to understand.

Treatment: The degree of hearing loss affects the treatment, but options are traditional aids or bone- anchored hearing system (BAHS).

Single-Sided Sensorineural Deafness

What it is: For total deafness in one ear, sound projected to the cochlea provides clarity and direction of sound better than hearing aids.

Causes: Birth defects, tumors around the hearing nerve, head injuries or diseases, or an unknown reason.

Symptoms:  Severe hearing loss or total deafness in only one ear, an inability or difficulty to understand speech on the deaf ear or lack of ability to directional sound.

Treatment:  The Sophono™ Alpha 2 MPO™ can be an excellent option.






  1. Sophono Scientific White Paper: Transcutaneous Energy Transfer by Bone Conductors through the Skin 29 September 2013.
  2. Comparing published transcutaneous device specifications of acousto-mechanical gain at 1.6 KHz and 60 dB SPL.
  3. Based on data from internal testing with acousto-mechanical gain at 1.6 KHz and 60 dB SPL.
  4. Implantable Auditory Devices presentation by Darius Kohan M.D. at Ultimate Colorado Midwinter Meeting, Vail, Colorado, February 3, 2015.
  5. Website: How to read an audiogram: Auditory thresholds. FIRST YEARS Professional Development through Distance Education Accessed 26 June 2015.
  6. Amos NE, Humes LE. Contribution of high frequencies to speech recognition in quiet and noise in listeners with varying degrees of high frequency sensorineural hearing loss Journal of Speech, Language, and Hearing Research (2007) 50, 819-834.
  7. Marsella P, Scorpecci A, Vallarino MV, Di Fiore S, Pacifico C, Sophono in Pediatric Patients: The Experience of an Italian Tertiary Care Center. Otolaryngology -- Head and Neck Surgery 2014 Apr 8;151(2):328-332.
  8. Denoyelle F, Coudert C, Thierry B, Parodi M, Mazzaschi O, Vicaut E, Tessier N, Loundon N, Garabedian EN. Hearing rehabilitation with the closed skin bone-anchored implant Sophono Alpha1: Results of a prospective study in 15 children with ear atresia. Int J Pediatr Otorhinolaryngol. 2015 Mar;79(3):382-7.
  9. Lin FR, Niparko JK, Ferrucci L. Hearing loss prevalence in the United States. [Letter] Arch Intern Med. 2011 Nov 14; 171(20): 1851-1852.

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