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This book describes the design, fabrication and evaluation of a polymer-based neural interface for a cochlear electrode array, reviewed in terms of fabrication process, functionality, and reliability. Polymer-based devices have attracted attention in the neural prosthetic field due to their flexibility and compatibility with micro-fabrication process. A liquid crystal polymer (LCP) is an inert, highly water-resistant polymer suitable for the encapsulation of electronic components and as a substrate material for fabricating neural interfaces. The author has designed, fabricated, and evaluated an LCP-based cochlear electrode array for an improved polymer-based cochlear implant. The thesis deals with 3 key topics: atraumatic deep insertion, tripolar stimulation, and long-term reliability. Atraumatic insertion of the intracochlear electrode and resulting preservation of residual hearing have become essential in state–of-the-art cochlear implantation. A novel tapered design of an LCP-based cochlear electrode array is presented to meet such goals. For high-density and pitch-recognizable cochlear implant, channel interaction should be avoided. Local tripolar stimulation using multi-layered electrode sites are shown to achieve highly focused electrical stimulation. This thesis addresses another vital issue in the polymer-based neural implants: the long-term reliability issue. After suggesting a new method of forming mechanical interlocking to improve polymer-metal adhesion, the author performs accelerating aging tests to verify the method’s efficacy. The aforementioned three topics have been thoroughly examined through various in vitro and in vivo studies. Verification foresees the development of LCP-based cochlear electrode array for an atraumatic deep insertion, advanced stimulation, and long-term clinical implant.
The cochlear implant is a device that bypasses a nonfunctional inner ear and stimulates the auditory nerve directly. Written by the "father" of the multi-electrode implant, this comprehensive text and reference gives an account of the principles underlying cochlear implants and their clinical application. For the clinician, the book will provide guidance in the treatment of patients; for the engineer and researcher it will provide the background for further research; and for the student, it will provide a through understanding of the subject.
The latest on cochlear implantation Thieme congratulates author Dr. J. Thomas Roland, Jr. for being chosen by New York magazine for its prestigious 'Best Doctors 2018' list. Praise for the previous edition: Cochlear Implants, Third Edition, has been completely revised to include the most up-to-date information on the clinical and translational sciences related to this rapidly evolving technology. It contains chapters on the latest developments in the field, including those in: genetics, neuroplasticity, expanding criteria for implantation, the application of implant technology to tinnitus and vestibular issues, music perception, and intraoperative monitoring. Key Features: Covers basic techniques as well as new concepts and areas of expansion, making it appropriate for beginners as well as experienced practitioners Includes information on the latest advancements in cochlear implant programming concepts Written by experts in the field who are spearheading advancements in cochlear implant technology This book will be a valuable reference for otolaryngologists – head and neck surgeons, audiologists, neurotologists, speech pathologists, and all professionals involved in the design and usage of cochlear implants as well as an essential text for audiology students.
Clinical information for Otolaryngologists is provided in topics that include: Imaging and Anatomy; Genetics of Hearing Loss, Testing and Relevance to Cochlear Implantation; Candidacy Evaluation, Medical and Surgical Considerations, expanding criteria in Children; Surgical Technique and Accepted Variations in Children; Bilateral Cochlear Implantation; Implanting Obstructed and Malformed Cochleae; Device Programming NRT, NRI, Streamlined programming; Cochlear Implants and Music; Rehabilitation and Educational Considerations; Outcomes and Variables Affecting Outcomes; Language Development and Cochlear Implantation; New Frontiers in Cochlear Implantation, electroacoustic, hearing preservation, etc; Revision Cochlear Implantation in Children; and Current and Future Device Options.
This is a comprehensive multi-author handbook covering all aspects of cochlear implantation, fully updated since its first edition was published in 1991. All aspects of this rapidly developing field are covered, from implant design, speech processing strategies, assessment and rehabilitation of children and adults to future developments. Chapters written by implant users and their parents give fascinating insight into the experience of hearing again with a cochlear implant.
Electric acoustic stimulation (EAS) combines electric stimulation in the mid- to high-frequency regions with acoustic stimulation in the low-frequency range with the aim to preserve residual low-frequency hearing after cochlear implantation, which together particularly improves speech understanding, pitch discrimination and music appreciation.In this volume, the most experienced clinical groups share their understanding of the use of EAS in adults and children. It offers an in-depth audiological analysis related to selecting, preparing and rehabilitating EAS patients. Topics such as dead zone assessment, psychophysics of low-frequency hearing, electric-acoustic interaction, speech algorithms, music perception, as well as fitting and the patient's acceptance are discussed. Introductory chapters - illustrated with exceptional colour images - on cochlear neural reserves, molecular biology and high-technological electrode development focus on the basic scientific EAS research. Every ENT specialist, audiologist, speech therapist and scientist interested in inner ear pathology, involved in cochlear implantation or dealing with the treatment or surgery of the inner ear will benefit from the insights and experiences of the world's leading experts who contributed to this publication.
It has been hypothesized that increasing the number of active sites on a cochlear implant electrode array will enable the recipient to distinguish a higher number of pitch precepts, thus creating a more natural sound. While DSP processing strategies for cochlear implants have evolved significantly to address this, technology for the actual electrode array has remained relatively constant and limits the number of physical electrodes possible. Previous work introduced the concept of using Thin-Film Array (TFA) technology to allow for much higher site densities, although the original devices proved unreliable during surgical insertion tests. This work presents a new method of combining polyimide-based TFA's with supporting silicone insertion platforms to create assembled electrode arrays that are a more viable option for surgical insertion. The electrical and mechanical properties of these assemblies are investigated with physical deformation tests and finite element analysis in COMSOL to quantify how they will perform upon insertion into the cochlea, and the preliminary results of a surgical insertion study into human cadaveric temporal bones will be discussed.
A cochlear implant is a surgically implanted electronic device that provides a sense of sound to a person who has a severe or profound hearing loss. A cochlear implant does not cure deafness or hearing impairment, but is a prosthetic substitute which directly stimulates the cochlea. There are over 250,000 users worldwide with 12,000 in the UK. This book is a multidisciplinary guide to cochlear implantation in children and adults with sensorineural hearing loss (where the root cause lies in the inner ear or sensory organ, ie the cochlear and associated organs). Beginning with discussion on the aetiology of hearing loss and assessment of cochlear implant candidacy, the next chapter discusses preoperative cochlear implant imaging. Each of the following sections provides in depth coverage of different types of cochlear implantation and their potential outcomes. The final sections examine miscellaneous topics such as music perception in cochlear implantation, drug eluting electrodes, cost effectiveness, and reliability reporting. Authored by internationally recognised, US-based specialists, the text is further enhanced by clinical and surgical photographs and illustrations. Key points Multidisciplinary guide to cochlear implantation in children and adults Covers different types of cochlear implant and potential outcomes Includes miscellaneous topics such as music perception, drug eluting electrodes, and reliability reporting Internationally recognised, US-based author team
The second edition of Cochlear Implants provides a comprehensive review of the state-of-the-art techniques for evaluating and selecting the cochlear implant candidate. Clear descriptions of surgical techniques guide the reader through implantation procedures, and chapters address important issues such as speech production, language development, and education in implant recipients. This second edition features: New chapters on the genetics of hearing loss, sound processing, binaural hearing, and electroacoustic stimulation Complete discussion of the most recent advances in evaluation procedures, surgery, programming methods, speech processing strategies, and more Precise, easy-to-follow tables and figures enhance comprehension of the basic science, research and clinical concepts covered in the text Coverage of the medical and surgical complications of cochlear implantation Insights from an interdisciplinary team of experts in otolaryngology, audiology, the basic sciences, speech pathology, and education Ideal for learning and reference, Cochlear Implants synthesizes the key information needed by practitioners, researchers, and students in a range of disciplines. Readers will benefit from both the scope and thoroughness of this authoritative reference. Dr. Roland honored in Best Doctors 2012 issue of New York Magazine