Bone anchored bone conductive hearing aid
The invention relates to a bone anchored bone conductive hearing aid which has a bone implantable screw ( 3 ) with an implant axis ( 25 ) intended to be generally perpendicular to a bone surface at an implant point and a skin penetrating abutment ( 5 ) which is connected to the implantable screw ( 3 ) through a contact surface ( 16 ) at a contra-lateral end thereof where the abutment ( 5 ) at a lateral end thereof has a coupling surface ( 15 ) whereto a hearing aid is detachably coupled along a hearing aid coupling axis ( 20 ) the implant axis ( 25 ) and the hearing aid coupling axis ( 20 ) are arranged at an angle α with respect to each other.
1. Bone anchored bone conductive hearing aid which has a bone implantable screw ( 3 ) with an implant axis ( 25 ) intended to be generally perpendicular to a bone surface at an implant point and a skin penetrating abutment ( 5 ) which is connected to the implantable screw ( 3 ) through a contact surface ( 16 ) at a contra-lateral end thereof where the abutment ( 5 ) at a lateral end thereof has a coupling surface ( 15 ) whereto a hearing aid is detachably coupled along a hearing aid coupling axis ( 20 ), wherein the implant axis ( 25 ) and the hearing aid coupling axis ( 20 ) are arranged at an angle α with respect to each other.
2. Bone anchored bone conductive hearing aid as claimed in claim 1 wherein the angle α is in the range between 5 and 20 degrees.
3. Bone anchored bone conductive hearing aid as claimed in claim 2 wherein the coupling surface ( 15 ) and the contact surface of the abutment ( 5 ) are circular.
4. Bone anchored bone conductive hearing aid as claimed in claim 3 wherein the abutment comprise a through going hole ( 30 ) for a fastening screw ( 31 ), and where the screw and screw hole is aligned along the implant axis ( 25 ).
5. Bone anchored bone conductive hearing aid as claimed in claim 4 wherein a recess ( 6 ) is provided at the lateral end of the abutment ( 5 ) for receiving a screw head ( 33 ) of the fastening screw ( 31 ).
6. Bone anchored bone conductive hearing aid as claimed in claim 5 wherein the recess ( 6 ) at the contra lateral end thereof comprise a seat surface for the screw head ( 33 ) arranged perpendicular to the implant axis ( 25 ).
7. Bone anchored bone conductive hearing aid as claimed in claim 1 wherein the hearing aid is magnetically attached to the skin penetrating abutment ( 5 ).