Pre-load feedback of a middle-ear coupler
A coupling device for a middle ear implant includes a transducer end configured to engage an implantable electromechanical transducer, a bone engagement end configured to engage a temporal bone surface of a recipient patient, a planar loading spring located between the transducer end and the bone engagement end and configured for compression by displacement of the transducer end and the bone engagement end in towards each other, and compression indicators configured to provide visual indication of a pre-load force created on the temporal bone surface by the compression of the loading spring.
1. A middle ear implant arrangement comprising:
an implantable electromechanical transducer configured to convert an input electrical stimulation signal into a corresponding output mechanical stimulation signal; and
a coupling device having:
i. a transducer end configured to engage the electromechanical transducer,
ii. a bone engagement end configured to engage a temporal bone surface of a recipient patient;
iii. an s-shape planar loading spring having a central spring axis along a common line between the transducer end and the bone engagement end and a center of mass located on the common line, wherein the loading spring is configured for compression along the central spring axis by displacement of the transducer end and the bone engagement end in towards each other; and
iv. a plurality of compression indicators configured to provide visual indication of a pre-load force created on the temporal bone surface by the compression of the loading spring.
2. The middle ear implant arrangement according to claim 1 , further comprising:
a pair of handling features in the loading spring configured to engage with a surgical compression tool to create the compression of the loading spring.
3. The middle ear implant arrangement according to claim 2 , wherein the handling features are handling holes in the loading spring.
4. The middle ear implant arrangement according to claim 1 , wherein the transducer end further comprises a cochlear engagement projection configured to mechanically connect the electromechanical transducer to a cochlear outer membrane surface for delivery of the mechanical stimulation signal to the cochlear outer membrane surface.
5. The middle ear implant arrangement according to claim 1 , wherein the loading spring is configured for displacement of the transducer end and the bone engagement end of up to 200 μm.
6. The middle ear implant arrangement according to claim 1 , wherein the pre-load force is up to 100 mN.
7. The middle ear implant arrangement according to claim 1 , wherein the pre-load force is 5-20 mN.
8. The middle ear implant arrangement according to claim 1 , wherein the coupling device is made of nitinol, titanium or gold.
9. A coupling device for a middle ear implant comprising:
a transducer end configured to engage an implantable electromechanical transducer,
a bone engagement end configured to engage a temporal bone surface of a recipient patient;
an s-shape planar loading spring having a central spring axis along a common line between the transducer end and the bone engagement end and a center of mass located on the common line, wherein the loading spring is configured for compression by displacement along the central spring axis of the transducer end and the bone engagement end in towards each other; and
a plurality of compression indicators configured to provide visual indication of a pre-load force created on the temporal bone surface by the compression of the loading spring.
10. The coupling device according to claim 9 , further comprising:
a pair of handling features in the loading spring configured to engage with a surgical compression tool to create the compression of the loading spring.
11. The coupling device according to claim 10 , wherein the handling features are handling holes in the loading spring.
12. The coupling device according to claim 10 , wherein the transducer end further comprises a cochlear engagement projection configured to mechanically connect the electromechanical transducer to a cochlear outer membrane surface for delivery of the mechanical stimulation signal to the cochlear outer membrane surface.
13. The coupling device according to claim 9 , wherein the loading spring is configured for displacement of the transducer end and the bone engagement end of up to 200 μm.
14. The coupling device according to claim 9 , wherein the pre-load force is up to 100 mN.
15. The coupling device according to claim 9 , wherein the pre-load force is 5-20 mN.
16. The coupling device according to claim 9 , wherein the coupling device is made of nitinol, titanium or gold.