Pre-Load Feedback of a Middle-Ear Coupler

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. 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
• 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.