Nitinol in Passive Ossicular Reconstruction-First Results From Temporal Bone Experiments.

Area of Science:

• Biomaterials science
• Otolaryngology
• Medical device engineering

Background:

• Restoring hearing is crucial in modern ear microsurgery.
• Rigid alloplastic materials are commonly used in passive ossicular reconstruction.
• Existing rigid prostheses do not adapt to atmospheric pressure changes.

Purpose of the Study:

• To evaluate nitinol, a super-elastic material, for passive ossicular reconstruction.
• To overcome the limitations of rigid prostheses in adapting to pressure variations.
• To develop and assess a novel nitinol clip prosthesis with a flexible headplate.

Main Methods:

• Developed a nitinol clip prosthesis with a flexible headplate.
• Evaluated prosthesis flexibility using a load-cell experiment.
• Compared sound transmission properties with standard titanium clip prostheses using laser-doppler vibrometry in temporal bones.

Main Results:

• Nitinol prosthesis exhibited statistically similar pure tone transmission characteristics compared to standard titanium prostheses.
• Load-cell tests confirmed the prosthesis's flexibility and its ability to return to its original shape after deformation.
• The nitinol prosthesis demonstrated high flexibility.

Conclusions:

• The newly developed nitinol clip prosthesis offers comparable sound transmission to established prostheses.
• Its high flexibility represents an advancement towards more physiological ossicular chain reconstruction.
• Nitinol is a suitable material for passive middle ear prostheses.