<P> In 1977 , the first three patients were implanted with a bone - conduction hearing solution by Anders Tjellström at the Ear , Nose , and Throat Department at Sahlgrenska University Hospital in Gothenburg , Sweden . A 4 - mm - long titanium screw with a diameter of 3.75 mm was inserted in the bone behind the ear , and a bone conduction hearing aid was attached . </P>
<P> In 1977 , the first three patients were implanted with a bone - conduction hearing solution by Anders Tjellström at the Ear , Nose , and Throat Department at Sahlgrenska University Hospital in Gothenburg , Sweden . A 4 - mm - long titanium screw with a diameter of 3.75 mm was inserted in the bone behind the ear , and a bone conduction hearing aid was attached . </P>
when was the bone anchored hearing aid invented
when was the bone anchored hearing aid invented
1977
1977