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Hearing aids

A brief outlook on hearing aids.

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Hearing aids

  1. 1. Hearing Aids<br />A Closer Look<br />
  2. 2. What is a hearing aid?<br />Small electronic device<br />Quiet and noisy situations<br />1 out of 5 who needs, actually uses<br />Three Basic Parts<br />Microphone<br />Amplifier<br />Speaker<br />
  3. 3. How does “hearing” work?<br />Sound travels through outeer ear<br />Eardrum vibrates<br />Three smalls bones carry sound to cochlea<br />Vibration stimulates hair cells<br />Creates electrical current to auditory nerve<br />Transmits to brain<br />
  4. 4. Hearing aid technology<br />Telecoil<br />Connect directly to hearing aid<br />Filters background noise<br />Used with telephones, FM systems, and induction loop systems<br />Directional Microphones<br />Amplify sounds more from front<br />Better signal to noise radio<br />Improves speech understanding in noise<br />
  5. 5. What causes hearing loss?<br />Two types of hearing loss:<br />Conductive hearing loss<br />Sound obstructed through the ear<br />Treatable with surgery<br />Sensorineuralhearing loss<br />Damage to the cochlea<br />Most common type<br />Type helped by hearing aid<br />
  6. 6. How do hearing aids work?<br />2 types of hearing aids<br />Analog<br />Converts sound waves into electrical signals<br />Custom built for each user<br />Less expensive<br />Digital<br />Converts sound waves into numerical codes<br />Similar to binary code<br />More flexibility in adjustment<br />
  7. 7. Analog hearing aid<br />
  8. 8. Digital hearing aid<br />
  9. 9. What type of hearing aids are there?<br />BTE (Behind-the-Ear)<br />Fits behind pinna(ear)<br />Consists of case, earmold, & tube<br />Sound routed from case to earmold<br />Mini BTE<br />
  10. 10. What type of hearing aids are there?(continued)<br />ITE (In-the-Ear)<br />Mild to severe hearing loss<br />Completely inside outer ear<br />Not recommended for children<br />Capable of added features<br />telecoil<br />
  11. 11. What type of hearing aids are there?(continued)<br />ITC(In-the-Canal)<br />Mild to moderate hearing loss<br />Customized to recipient<br />Almost completely hidden<br />Difficult to adjust and change battery<br />
  12. 12. What type of hearing aids are there?(continued)<br />CIC(Completely-in-Canal)<br />Mild to moderate hearing loss<br />Smaller than ITC<br />Difficult to adjust and add features<br />More expensive<br />
  13. 13. Cochlear Implant<br />Designed for those who are profoundly deaf<br />Can be used alone or with traditional hearing aid<br />Two main systems:<br />External<br />Sound processer, microphone, and transmitter<br />Internal<br />Receiver and electrode array<br />
  14. 14. Future for hearing aids<br />BAHA(Bone Anchored Hearing Aid)<br />Bypass normal hearing system<br />Helps severe sensorineural, condutive, or mixed<br />Attach to bones in middle ear<br />Bypasses auditory canal and middle ear<br />
  15. 15. Conclusion<br />Hearing aids are smaller and more powerful<br />Aiming for higher sound quality in the future<br />Accommodate virtually every type of listening environment<br />Continually adjust themselves to improve sound quality and reduce feedback<br />Closer to achieving gift of hearing<br />
  16. 16. References<br />National Institute on Deafness and Other Communication Disorders, . (2010, March 04). Hearing aids. Retrieved from http://www.nidcd.nih.gov/health/hearing/h earingaid.asp <br />Anne Eisenberg, . (2006, September 24). <br />The Hearing aid as fashion statement. The New York Times<br />LastPaulDybala, . (2006). Hearing aid or headset?. Audiology Online, Retrieved from http://www.audiologyonline.com/articles/article_detail.asp?article_id=1542 <br />