TAILIEUCHUNG - Cochlear Implants: Fundamentals and Application - part 7

Phía sau tai Clarion xử lý tiếng nói được sử dụng pin sạc, nhưng điều này giới hạn thời gian chạy. Nó được minh họa trong hình 8,19. Med El Tempo xử lý tiếng nói sử dụng ba loại pin kẽm-không khí cho khoảng 36 Giờ hoạt động. Nó kích thước 6,6 1,3 0,9 cm, và đến thẳng, góc cạnh và của các cấu hình trẻ em | 484 8. Engineering Figure . Top The Cochlear Limited Nucleus 24 body-worn SPrint for the regular and research speech-processing strategies Reprinted with permission from Cochlear Limited . Bottom The Clarion Platinum body-worn speech processor Reprinted with permission from Advanced Bionics Corporation . The Clarion behind-the-ear speech processor used rechargeable batteries but this limited their running time. It is illustrated in Figure . The Med El Tempo speech processor used three zinc-air batteries for approximately 36 hours operation. It dimensions were X X cm. and came in straight angled and children s configurations. Receiver-Stimulators The receiver-stimulator needed not only to be designed with circuitry for low power consumption and hence long battery life but also to allow a number of speech-processing strategies to be evaluated. If for example certain rates waveforms and stimulus patterns were found to be helpful this should be possible without having to explant the device and replace it with a new one. The device should also provide charge-balanced biphasic pulses to minimize corrosion of electrodes. Electronic and Communications Engineering 485 Figure . Left The Cochlear Limited Nucleus 24 behind-the-ear ESPrit-3G for the regular speech-processing strategies SPEAK CIS ACE Reprinted with permission from Cochlear Limited . Right The Clarion behind-the-ear speech processor for the CIS strategy Reprinted with permission from Advanced Bionics Corporation . Design Principles Constant Current Stimulation The first consideration was whether constant current or constant voltage stimulation should be employed. With constant voltage stimulation the interface impedance between electrode and tissue may change in which case the current flowing through the nerve could vary. An increase in electrode impedance will result in reduction in current unless the voltage is increased I V R Ohm s law . The current amplitude and therefore the amount of

• Y học thường thức
• Auditory Prostheses
• Auditory Prosthesis
• Cochlear Implantation
• Bilateral Cochlear Implants
• Vestibular Implants
• Electric Hearing
• Cochlear
• Implant
• Cila Umat
• Rinze Anthony Tange
• Health
• Sciences
• medicine
• pharmacolocy
• báo cáo khoa học
• báo cáo hóa học
• công trình nghiên cứu về hóa học
• tài liệu về hóa học
• cách trình bày báo cáo
• báo cáo y học
• công trình nghiên cứu về y học
• tài liệu về y học
• An introduction to the physiology of hearing
• The auditory cortex
• The centrifugal pathways
• Sensorineural hearing loss
• Physiological aspects of the cochlear prosthesis
• Sound localization and spatial hearing
• Neck surgery
• Ballenger’s otorhinolaryngology head
• Vestibular systems
• Gene therapy
• Hair cell regeneration
• Cochlear biophysics
• BMC Pulmonary Medicine
• Granulomatosis with polyangitis
• Pulmonary fibrosis
• Mycobacterium abscessus
• Sporadic lung disease
• Cystic fibrosis