An anatomically shaped incus prosthesis for reconstruction of the ossicular chain

An anatomically shaped incus replica prosthesis has been designed to reconstruct the ossicular chain. A series of in vitro studies on human temporal bones evaluated the acoustic performance of this prosthesis and compared it with a Causse partial ossicular replacement prosthesis (PORP). Pure tones i...

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Bibliographic Details
Published in:Hearing research 2000-07, Vol.145 (1), p.141-148
Main Authors: Lord, Richard M., Mills, Robert P., Abel, Eric W.
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Biological and medical sciences
Cadaver
Ear, Middle - physiopathology
Head and neck surgery. Maxillofacial surgery. Dental surgery. Orthodontics
Humans
Incus
Incus prosthesis
Interferometry
Laser vibrometer
Lasers
Medical sciences
Middle ear
Ossicular chain
Ossicular Prosthesis
Ossicular Replacement
Ossiculoplasty
Stapes - physiology
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Surgery of the ear, the auditive nerve and the facial nerve
Temporal Bone - physiopathology
Tympanic Membrane - physiopathology
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Summary:An anatomically shaped incus replica prosthesis has been designed to reconstruct the ossicular chain. A series of in vitro studies on human temporal bones evaluated the acoustic performance of this prosthesis and compared it with a Causse partial ossicular replacement prosthesis (PORP). Pure tones in the frequency range 0.125–8 kHz stimulated the tympanic membrane at sound pressure levels of 80, 90 and 100 dB. Measurements of the stapes footplate velocity were made with a laser interferometer. The acoustic function of the ossicular chain reconstructed with the incus replica prosthesis was found to be within 10 dB of that of the original intact ossicular chain, when both the upper and lower joints of the implant were rigidly fixed in place. It was shown that a rigid mechanical contact between the ossicular prosthesis and ossicles is a prerequisite for effective sound transmission. The anatomically shaped incus prosthesis gave a 15-dB improvement on the PORP at frequencies below 1.5 kHz.
ISSN:0378-5955
1878-5891
DOI:10.1016/S0378-5955(00)00085-X