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Speech coding strategies of the digisonic fully digitized cochlear implant
C H Chouard1, M Ouayoun, B Meyer
1ENT Department, Hôpital Saint-Antoine, Paris, France.
Acta Oto-Laryngologica
|March 1, 1995
Summary
The Digisonic cochlear implant features an articulated array for precise electrode insertion and a large stimulation area. This digitized device offers versatile programming for various speech coding strategies, benefiting patients with normal or obstructed cochleas.
Area of Science:
- Otorhinolaryngology
- Biomedical Engineering
- Neuroscience
Background:
- Cochlear implants are vital for hearing restoration in severe to profound sensorineural hearing loss.
- Advancements in implant technology focus on improving electrode design, signal processing, and surgical adaptability.
- The Digisonic represents a fully digitized cochlear implant system designed for enhanced performance and patient-specific programming.
Purpose of the Study:
- To describe the features and application of the Digisonic fully digitized cochlear implant.
- To highlight the device's articulated array, electrode design, and signal processing capabilities.
- To present initial patient outcomes, including its use in young children and those with cochlear obstruction.
Main Methods:
- The Digisonic implant utilizes an articulated array with 15 electrodes, each featuring a large microrelief surface area for extensive stimulation.
- A 128-point Fast Fourier Transform (FFT) provides sound information across a wide frequency range (64-7800 Hz).
- Programmable stimulation modes, sequential electrode activation, and adjustable frequency band parameters allow for customized speech coding strategies. A specialized version with 10 insulated electrodes is available for cases of cochlear obstruction.
Main Results:
- The device's design facilitates insertion into the cochlea, with a compact receiver suitable for young children (as young as 2 years old).
- Electric crosstalk is minimized through electrode array shaping and optional programming.
- The system was implanted in 46 patients between 1992 and 1994, including 8 children and 9 patients with total cochlear obstruction.
Conclusions:
- The Digisonic cochlear implant offers a versatile and adaptable solution for hearing restoration.
- Its design accommodates a broad range of patients, including pediatric cases and those with complex cochlear anatomy.
- The system's programmability supports diverse speech coding strategies, potentially optimizing auditory perception.
