Implanted hearing aid uses bone conduction to bypass defective middle ear

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">HEALTH AND WELLBEING</a> <h1 id="ar_title">Implanted hearing aid uses bone conduction to bypass defective middle ear</h1> <div class="summary_details_left"> <p>By <a href="/web/20130116181759/http://www.gizmag.com/author/ben-coxworth/" rel="author">Ben Coxworth</a></p> <p><em>January 14, 2013</em></p> </div> <div class="summary_details_right"> <div class="has_comments"><a href="bone-conduction-implant#comments">2 Comments</a></div> <div class="has_pictures"><a href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures">4 Pictures</a></div> </div> </div> <div id="article_share_rail"> <div class="as_button"><div class="fb-like" data-href="http://www.gizmag.com/bone-conduction-implant/25791/" data-send="false" data-layout="box_count" data-show-faces="false"></div><script type="text/javascript">_ga.trackFacebook();</script></div> <div class="as_button"><a href="https://web.archive.org/web/20130116181759/http://twitter.com/share" class="twitter-share-button" data-count="vertical" data-via="gizmag">Tweet</a></div> <div class="as_button"><div class="g-plusone" data-size="tall" data-href="http://www.gizmag.com/bone-conduction-implant/25791/"></div></div> <div class="as_button"><iframe style="overflow: hidden; margin: 0px; padding: 0px; border: 0px; " src="https://web.archive.org/web/20130116181759if_/http://badge.stumbleupon.com/badge/embed/5/?url=http%3A%2F%2Fwww.gizmag.com%2Fbone-conduction-implant%2F25791%2F" width="50" height="60" id="iframe-stmblpn-widget-1"></iframe></div> <div class="as_button"><div class="pin-it-button" data-url="https://web.archive.org/web/20130116181759oe_/http://www.gizmag.com/bone-conduction-implant/25791/" data-image="http://images.gizmag.com/hero/boneconductionimplant.jpg" data-description="An new implantable hearing aid uses bone conduction to bypass the defective middle ear. "></div></div> <div class="as_button"><script type="IN/Share" data-counter="top"></script></div> <div class="as_button" id="reddit_button_rail"><script type="text/javascript">reddit_newwindow='1'</script></div> <div class="as_button" id="email_a_friend_rail"><span class="email_a_friend">Email</span></div> </div> <div id="hero_box" style="width: 530px;"> <a id="hero_link" href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures"> <img src="https://web.archive.org/web/20130116181759im_/http://images.gizmag.com/hero/boneconductionimplant.jpg" title="The external sound processor (top) and the actual implant, that make up the Bone Conductio..." width="530" height="297" alt="The external sound processor (top) and the actual implant, that make up the Bone Conductio..."/></a> <div class="pic_caption"> <p>The external sound processor (top) and the actual implant, that make up the Bone Conduction Implant </p> <a href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures" id="gallery_link">Image Gallery</a> (4 images) </div> <div class="clear_both"></div> </div> <div class="article_body"> <div id="top_unit"></div> <script type="text/javascript"> </script> <script type="text/javascript" src="https://web.archive.org/web/20130116181759js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"></script> <p>There may soon be help for people who have been rendered functionally deaf by problems of the middle ear. Researchers from Sweden’s Chalmers University of Technology have developed an implant that bypasses the defective middle ear, transmitting sounds to the inner ear by sending vibrations right through the skull bone.</p> <ul id="gallery_images"> <li><a href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures#1" class="image"><img src="https://web.archive.org/web/20130116181759im_/http://images.gizmag.com/gallery_tn/boneconductionimplant-1.jpg" title="Måns Eeg-Olofsson (left) and Bo Håkansson " alt="Måns Eeg-Olofsson (left) and Bo Håkansson "/></a></li> <li><a href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures#2" class="image"><img src="https://web.archive.org/web/20130116181759im_/http://images.gizmag.com/gallery_tn/boneconductionimplant-2.jpg" title="Sounds are picked up by the processor (top), transmitted through the skin to the implant, ..." alt="Sounds are picked up by the processor (top), transmitted through the skin to the implant, ..."/></a></li> <li><a href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures#3" class="image"><img src="https://web.archive.org/web/20130116181759im_/http://images.gizmag.com/gallery_tn/boneconductionimplant-3.jpg" title="A diagram of the external sound processor (top) and the actual implant, that make up the B..." alt="A diagram of the external sound processor (top) and the actual implant, that make up the B..."/></a></li> </ul> <div class="clear_both"></div> <p>Developed by a team led by Prof. Bo Håkansson, the two-part Bone Conduction Implant (BCI) is intended mainly for use on “individuals who have been affected by chronic inflammation of the outer or middle ear, or bone disease, or who have congenital malformations of the outer ear, auditory canal or middle ear.” Regular hearing aids typically don’t work for such people, as they’re usually designed for dealing with problems of the <em>inner</em> ear.</p> <p>The implant itself is a little less than six centimeters (2.4 inches) long, and is attached behind the ear, under the skin, directly into the surface of the skull.</p> <p>It’s paired with an external sound processor, which is what actually receives sounds from the outside world. This unit is placed against the skin, directly adjacent to the implant, and is held in place by magnets in both devices. An inductive coil in the implant allows it to receive sound transmitted through the skin, from the processor. The implant then uses a miniature quadratic loudspeaker to relay those sound vibrations into the bone of the skull, through which they travel to the inner ear.</p> <div style="width: 474px; height: 528px; margin-bottom: 1px;" class="article_img"><a href="/web/20130116181759/http://www.gizmag.com/bone-conduction-implant/25791/pictures#3" target="_blank"><img src="https://web.archive.org/web/20130116181759im_/http://images.gizmag.com/inline/boneconductionimplant-2.jpg" width="474" alt="Sounds are picked up by the processor (top), transmitted through the skin to the implant, ..."/></a></div><div class="inline_caption" style="width: 474px; padding: 0;"><p>Sounds are picked up by the processor (top), transmitted through the skin to the implant, and then transmitted by the implant into the skull bone </p></div><div class="clear_both"></div> <p>Previous bone conduction-based hearing aids have required the patient to have a titanium screw permanently protruding from the skull through the skin, to which the external device itself is attached. Such a set-up can result in infections, and the possibility of the screw falling out. With the BCI, the skin is left intact (once it’s healed up, after the insertion of the implant), and the processor can simply be pulled off when not needed.</p> <p>A deaf test subject received a BCI last month, although Håkansson and his team are still waiting for the incision to heal before turning the accompanying processor on. Sahlgrenska University Hospital's Måns Eeg-Olofsson, who has been in charge of the medical aspects of the research, performed the procedure.</p> <p>If it works as hoped, clinical trials will follow, with possible widespread use of the BCI within one to two years.</p> <p>Source: <a href="https://web.archive.org/web/20130116181759/http://www.chalmers.se/en/news/Pages/New-implant-replaces-impaired-middle-ear.aspx" target="_blank">Chalmers University of Technology</a></p>   <div id="bottom_unit"> <script type="text/javascript"> </script> <script type="text/javascript" src="https://web.archive.org/web/20130116181759js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"></script> </div> </div>   <span class="title share_bar">Share</span> <div id="article_share_bar" class="dotsontop share_bar"> <div class="as_button fb_as_button"><div class="fb-like" data-href="http://www.gizmag.com/bone-conduction-implant/25791/" data-send="false" data-layout="box_count" data-show-faces="false"></div><script type="text/javascript">_ga.trackFacebook();</script></div> <div class="as_button"><a href="https://web.archive.org/web/20130116181759/http://twitter.com/share" class="twitter-share-button" data-count="vertical" data-via="gizmag">Tweet</a></div> <div class="as_button"><div class="g-plusone" data-size="tall" data-href="http://www.gizmag.com/bone-conduction-implant/25791/"></div></div> <div class="as_button"><iframe style="overflow: hidden; margin: 0px; padding: 0px; border: 0px; " src="https://web.archive.org/web/20130116181759if_/http://badge.stumbleupon.com/badge/embed/5/?url=http%3A%2F%2Fwww.gizmag.com%2Fbone-conduction-implant%2F25791%2F" width="50" height="60" id="iframe-stmblpn-widget-2"></iframe></div> <div class="as_button"><div class="pin-it-button" data-url="https://web.archive.org/web/20130116181759oe_/http://www.gizmag.com/bone-conduction-implant/25791/" data-image="http://images.gizmag.com/hero/boneconductionimplant.jpg" data-description="An new implantable hearing aid uses bone conduction to bypass the defective middle ear. "></div></div> <div class="as_button"><script type="IN/Share" data-counter="top"></script></div> <div class="as_button" id="reddit_button_bar"><script type="text/javascript">reddit_newwindow='1'</script></div>  </div>  <span class="title clear_left" id="author_byline_title">About the Author</span> <div class="dotsontop" id="authorcontainer">  <a href="/web/20130116181759/http://www.gizmag.com/author/ben-coxworth/"> <img src="https://web.archive.org/web/20130116181759im_/http://images.gizmag.com/author_profiles/127.jpg" alt="Ben Coxworth" id="bio_pic"/> </a>   An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away.   <a href="/web/20130116181759/http://www.gizmag.com/author/ben-coxworth/">All articles by Ben Coxworth</a> <br class="clear_both"> </div>  <div id="tags"> <span class="title">Tags</span> <div class="dotsontop"> <ul> <li>» <a href="/web/20130116181759/http://www.gizmag.com/tag/bone+conduction/" rel="tag">Bone Conduction</a></li> <li>» <a href="/web/20130116181759/http://www.gizmag.com/tag/chalmers-university-of-technology/" rel="tag">Chalmers University of Technology</a></li> <li>» <a href="/web/20130116181759/http://www.gizmag.com/tag/hearing+aid/" rel="tag">Hearing Aid</a></li> <li>» <a href="/web/20130116181759/http://www.gizmag.com/tag/implant/" rel="tag">Implant</a></li> </ul> <div class="clear_both"></div> </div> </div> <div id="bing_unit"></div>  <span class="title" id="comments">2 Comments</span> <div class="dotsontop"> <div id="comment-190615" class="a_comment"> <p>I'm assuming the battery in the implant is charged inductively? </p> <p>If there is no battery - how powerful could the passive inductive device be? </p> <span class="name">Daniel Brown</span><br> <span class="date"> 14th January, 2013 @ 03:42 pm PST</span> </div> <div id="comment-190717" class="a_comment"> <p>The battery is only in the external unit. The signal is transmitted using amplitude modulation via an inductive link and the maximum output level is on the same level as conventional bone anchored hearing aids stimulating the bone via a percutaneous implant. The proximity to the cochlea is a great advantage with the BCI. </p> <span class="name">Bo Håkansson</span><br> <span class="date"> 15th January, 2013 @ 12:13 am PST</span> </div> </div> <span class="title">Post a Comment</span> <div class="dotsontop" id="comment_form_div"> <div id="comment_form" data-article="25791"> <div id="comments_login"> <form action="/web/20130116181759/http://www.gizmag.com/index.php" name="login_form" id="login_form" onsubmit="return false;"> <p class="bold">Login with your gizmag account:</p> <p id="login_status"></p> <label for="email">Email</label><input type="text" name="email" id="email" value=""/> <label for="password">Password</label><input type="password" name="password" id="password" value=""/> <input type="submit" value="Log In" class="med"/> <div id="options"> <a href="/web/20130116181759/http://www.gizmag.com/register/">Register here</a><br> <a href="/web/20130116181759/http://www.gizmag.com/new_password/">Forgotten your password?</a> </div> <input 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Implanted hearing aid uses bone conduction to bypass defective middle ear