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DESIGN AND MANUFACTURE OF BASE / FILAMENT INTERCONNECTS AND FILAMENT PATTERNING OF PIEZOELECTRIC COCHLEAR IMPLANT

MITRA, SMITA
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092405861

Abstract Details

2004, MS, University of Cincinnati, Engineering : Materials Science.
This dissertation describes the efforts undertaken towards the development of a successful polymer electrode and interconnect based piezoelectric cochlear implant hearing aid device. A thorough review of the cochlear environment and processes resulted in the identification of the requirements of such a device, most critical of which are high sensitivity, small dimensions and flexibility, impedance matching and biocompatibility. Based on these requirements and initial experiments, proper electrode material was identified. These devices are based on flexible polymer piezoelectric films, used in the bending/flexure mode of deformation. The specific material chosen was Polyvinylidene fluoride (PVDF), as PVDF is the most sensitive piezoelectric polymer and high quality commercial films are readily available. Polypyrrole was identified as the most appropriate electrode and interconnect material in working towards developing an all-polymer system. The suitability of Polypyrrole (PPY) material for this application was investigated. For the cochlear implant application, the devices with PPY electrodes and interconnect showed much higher voltage responses than those from metal electroded devices. To measure the piezoelectric sensitivity of these devices to acoustic waves in-air measurements were carried out. Devices measured display very high sensitivity (several volts for conversational sounds at close range). Dependence of in-air sensitivity on device dimensions and interconnect pattering was investigated. It was found that interconnects connected in parallel showed a very high voltage response as compared to interconnect connected in series. In work towards the development of interconnect and electrode for cochlear implant it was seen that properties of PPY exceeded those of metal interconnect and electrode material. Conclusions were made followed by recommendations for future work.
Dr. Rodney Roseman (Advisor)
230 p.
Engineering, Materials Science

Recommended Citations

Citations

  • MITRA, S. (2004). DESIGN AND MANUFACTURE OF BASE / FILAMENT INTERCONNECTS AND FILAMENT PATTERNING OF PIEZOELECTRIC COCHLEAR IMPLANT [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092405861

    APA Style (7th edition)

  • MITRA, SMITA. DESIGN AND MANUFACTURE OF BASE / FILAMENT INTERCONNECTS AND FILAMENT PATTERNING OF PIEZOELECTRIC COCHLEAR IMPLANT. 2004. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092405861.

    MLA Style (8th edition)

  • MITRA, SMITA. "DESIGN AND MANUFACTURE OF BASE / FILAMENT INTERCONNECTS AND FILAMENT PATTERNING OF PIEZOELECTRIC COCHLEAR IMPLANT." Master's thesis, University of Cincinnati, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092405861

    Chicago Manual of Style (17th edition)

ucin1092405861
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© 2004, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.