Pre-operative appraisal of cochlear implant results by means of electrical promontory stimulation: Preliminary report

Fritze, W.; Eisenwort, Brigitte

doi:10.1007/bf00464253

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…The simultaneous activation of right hippocampus suggest that the burst stimuli mobilise a search for memory clues to the nature of the stimulus (Maguire et al, 1997;Videbech et al, 2001). The uncertain nature of the perception is well known from studies of hearing-impaired or deaf patients (Fritze and Eisenwort, 1984;Shipp and Nedzelski, 1991). Thus, it is questionable whether pre-implantation measures always represent an auditory response (Gantz et al, 1988).…”

Section: Electrical Burst Stimulusmentioning

confidence: 99%

Use of time differences in normal hearing – cortical processing of promontorial stimuli

Mortensen¹,

Madsen²,

Gjedde³

2005

Hearing Research

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Section: Electrical Burst Stimulusmentioning

confidence: 99%

Use of time differences in normal hearing – cortical processing of promontorial stimuli

Mortensen¹,

Madsen²,

Gjedde³

2005

Hearing Research

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“…4 • However, some correlation has been found between preoperative and postoperative 8 10 data in some patient populations. 7 • • In assessing the usefulness of promontory stimulation data it is also relevant to consider the correlation (if any) of preoperative thresholds with postoperative intra-cochlear thresholds. If these two measures are both related to the size of surviving neural populations, one would expect them to be highly correlated with one another.…”

Section: Introductionmentioning

confidence: 99%

Factors Predicting Postoperative Sentence Scores in Postlinguistically Deaf Adult Cochlear Implant Patients

Blamey¹,

Pyman²,

Gordon³

et al. 1992

Ann Otol Rhinol Laryngol

216

140

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A sample of 64 postlinguistically profoundly to totally deaf adult cochlear implant patients were tested without lipreading by means of the Central Institute for the Deaf (CID) sentence test 3 months postoperatively. Preoperative promontory stimulation results (thresholds, gap detection, and frequency discrimination), age, duration of profound deafness, cause of deafness, lipreading ability, postoperative intracochlear thresholds and dynamic ranges for electrical stimulation, depth of insertion of the electrode array into the scala tympani, and number of electrodes in use were considered as possible factors that might be related to the postoperative sentence scores. A multiple regression analysis with stepwise inclusion of independent variables indicated that good gap detection and frequency discrimination during preoperative promontory testing, larger numbers of electrodes in use, and greater dynamic ranges for intracochlear electrical stimulation were associated with better CID scores. The CID scores tended to decrease with longer periods of profound deafness.

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“…Second, the 6-bit DAC thermometer generates the suitable stimulation current in the nerve ending. Finely, the output stage is composed of 1KΩ loads [3,9]. Minimum dimensions of the tailed current source transistors giving the best linearity and permitting a 1mA-maximum stimulation current generation through 3KΩ-maximum which represent the equivalent impedance of biological tissue.…”

Section: Simulation Resultsmentioning

confidence: 99%

A programmable 9-bit current sources design dedicated to cochlear implant

Rekik

Shabou

BenHamida

et al. 2008

2008 15th IEEE International Conference on Electronics, Circuits and Systems

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This paper presents a programmable 9-bits current source design for micro-stimulator dedicated to cochlear implant. Such architecture requires a current source permitting to generate bidirectional current multiform. Besides, thanks to a programmable module, flexibility was provided in stimulus generation. In fact, the hearing threshold could be determined, using 3-bits DAC in order to fix the maximum comfortable stimulation, then the stimulation current pulses could be controlled in amplitude, using a 6-bits thermometer DAC, as well as in width. These parameters permit to modulate the charge quantity to be injected later in the cochlea nerve endings. The current sources of the 6-bits DAC have been sized to guaranty low power consumption, a low silicon occupation and an INL of less than 0.4 LSB and a DNL of less than 0.08 LSB. The maximum output providing is about 1mA of full scale current at each output from 3.3V supply, when the output is terminated on 1KΩ loads.I.

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Pre-operative appraisal of cochlear implant results by means of electrical promontory stimulation: Preliminary report

Abstract: A test procedure based on the patient's understanding of acoustic material is presented. The score obtained in this test showed a highly significant correlation with the postoperative score evaluated by independent examiners 4 weeks after stimulator adjustment.

Cited by 10 publications

References 3 publications

Use of time differences in normal hearing – cortical processing of promontorial stimuli

Use of time differences in normal hearing – cortical processing of promontorial stimuli

Factors Predicting Postoperative Sentence Scores in Postlinguistically Deaf Adult Cochlear Implant Patients

A programmable 9-bit current sources design dedicated to cochlear implant

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