Готові списки джерел за темами / Intracochlear pressure

Добірка наукової літератури з теми "Intracochlear pressure"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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Статті в журналах з теми "Intracochlear pressure"

Grossöhmichen, Martin, Rolf Salcher, Klaus Püschel, Thomas Lenarz, and Hannes Maier. "Differential Intracochlear Sound Pressure Measurements in Human Temporal Bones with an Off-the-Shelf Sensor." BioMed Research International 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/6059479.

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Анотація:

The standard method to determine the output level of acoustic and mechanical stimulation to the inner ear is measurement of vibration response of the stapes in human cadaveric temporal bones (TBs) by laser Doppler vibrometry. However, this method is reliable only if the intact ossicular chain is stimulated. For other stimulation modes an alternative method is needed. The differential intracochlear sound pressure between scala vestibuli (SV) and scala tympani (ST) is assumed to correlate with excitation. Using a custom-made pressure sensor it has been successfully measured and used to determine the output level of acoustic and mechanical stimulation. To make this method generally accessible, an off-the-shelf pressure sensor (Samba Preclin 420 LP, Samba Sensors) was tested here for intracochlear sound pressure measurements. During acoustic stimulation, intracochlear sound pressures were simultaneously measurable in SV and ST between 0.1 and 8 kHz with sufficient signal-to-noise ratios with this sensor. The pressure differences were comparable to results obtained with custom-made sensors. Our results demonstrated that the pressure sensor Samba Preclin 420 LP is usable for measurements of intracochlear sound pressures in SV and ST and for the determination of differential intracochlear sound pressures.

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Olson, Elizabeth S., and Wei Dong. "Nonlinearity in Intracochlear Pressure." ORL 68, no. 6 (2006): 359–64. http://dx.doi.org/10.1159/000095278.

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Todt, Ingo, Arneborg Ernst, and Philipp Mittmann. "Effects of Different Insertion Techniques of a Cochlear Implant Electrode on the Intracochlear Pressure." Audiology and Neurotology 21, no. 1 (2016): 30–37. http://dx.doi.org/10.1159/000442041.

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To achieve a functional atraumatic insertion, low intracochlear pressure changes during the procedure are assumed to be important. The aim of this study was to observe intracochlear pressure changes due to different insertion techniques in a cochlear model. Cochlear implant electrode insertions were performed in an artificial cochlear model to record intracochlear pressure changes with a micropressure sensor to evaluate the maximum amplitude and frequency of pressure changes under different insertional conditions. We found statistically significant differences in the occurrence of intracochlear pressure peak changes comparing different techniques. Based on our model results, an insertion should be maximally supported to minimize micromovement-related pressure changes.

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Todt, I., D. Karimi, J. Luger, A. Ernst, and P. Mittmann. "Postinsertional Cable Movements of Cochlear Implant Electrodes and Their Effects on Intracochlear Pressure." BioMed Research International 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/3937196.

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Introduction.To achieve a functional atraumatic cochlear implantation, intracochlear pressure changes during the procedure should be minimized. Postinsertional cable movements are assumed to induce intracochlear pressure changes. The aim of this study was to observe intracochlear pressure changes due to postinsertional cable movements.Materials and Methods.Intracochlear pressure changes were recorded in a cochlear model with a micro-pressure sensor positioned in the apical region of the cochlea model to follow the maximum amplitude and pressure gain velocity in intracochlear pressure. A temporal bone mastoid cavity was attached to the model to simulate cable positioning. The compared conditions were (1) touching the unsealed electrode, (2) touching the sealed electrode, (3) cable storage with an unfixed cable, and (4) cable storage with a fixed cable.Results.We found statistically significant differences in the occurrence of maximum amplitude and pressure gain velocity in intracochlear pressure changes under the compared conditions. Comparing the cable storage conditions, a cable fixed mode offers significantly lower maximum pressure amplitude and pressure gain velocity than the nonfixed mode.Conclusion.Postinsertional cable movement led to a significant pressure transfer into the cochlea. Before positioning the electrode cable in the mastoid cavity, fixation of the cable is recommended.

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Todt, Ingo, Arneborg Ernst, and Philipp Mittmann. "Effects of Round Window Opening Size and Moisturized Electrodes on Intracochlear Pressure Related to the Insertion of a Cochlear Implant Electrode." Audiology and Neurotology Extra 6, no. 1 (February 23, 2016): 1–8. http://dx.doi.org/10.1159/000442515.

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Intracochlear pressure changes during the cochlear implant insertion are assumed to be an important contributor to hearing preservation. The aim was to observe intracochlear pressure changes by different round window opening sizes and different hydrophilic electrode conditions. The experiments were performed in a cochlear model with a micropressure sensor in the helicotrema area. Different artificial round window membrane and different moisturized electrode conditions were compared. A punctured round window causes a significantly higher and an indirect moisturized electrode condition a significantly lower intracochlear pressure change. The degree of round window opening and the hydrophilic character of an electrode during insertion affect the intracochlear pressure significantly in a model.

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Greene, Nathaniel, David A. Anderson, and Theodore F. Argo. "Occluded insertion loss from intracochlear pressure measurements during acoustic shock wave exposure." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A216. http://dx.doi.org/10.1121/10.0011096.

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Auditory injuries are a common result of high intensity noise exposure, and hearing protective devices (HPDs) can mitigate this injury. Current evaluation methods use manikins to measure ear canal SPLs, but neglect alternate sound conduction pathways. We have previously reported intracochlear pressures in cadaveric human specimens to high-level impulse noise, revealing a substantial bone conducted component. Here, we estimate insertion loss during HPD use from intracochlear pressures in those same specimens. Cadaveric specimens were exposed to shock waves with peak overpressures of 7–83 kPa. Fiber optic pressure sensors were placed in the external, middle, and inner ears and responses measured with ears unoccluded and with four HPDs. Spectral insertion loss was calculated for each exposure level in the frequency domain. Insertion losses calculated from EAC pressures were comparable across levels, consistent with results from acoustic manikins. In contrast, insertion loss calculated from intracochlear pressures were generally lower in magnitude, but increased with the exposure level, likely due to substantial contributions of secondary transmission pathways. Unfortunately, variability in intracochlear pressures limit insertion loss estimate utility. As a proof of concept, we show that averaging multiple exposures increased signal-to-noise considerably, similar noise reduction strategies should be utilized in future studies.

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Lauer, Gina, Julica Uçta, Lars Decker, Arneborg Ernst, and Philipp Mittmann. "Intracochlear Pressure Changes After Cochlea Implant Electrode Pullback—Reduction of Intracochlear Trauma." Laryngoscope Investigative Otolaryngology 4, no. 4 (July 11, 2019): 441–45. http://dx.doi.org/10.1002/lio2.295.

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Dong, Wei, and Elizabeth S. Olson. "Two-tone distortion in intracochlear pressure." Journal of the Acoustical Society of America 117, no. 5 (May 2005): 2999–3015. http://dx.doi.org/10.1121/1.1880812.

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Todt, I., P. Mittmann, and A. Ernst. "Intracochlear Fluid Pressure Changes Related to the Insertional Speed of a CI Electrode." BioMed Research International 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/507241.

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Introduction. To preserve residual hearing the atraumaticity of the cochlea electrode insertion has become a focus of cochlear implant research. In addition to other factors, the speed of insertion is thought to be a contributing factor in the concept of atraumatic implantation. The aim of our study was to observe intracochlear fluid pressure changes due to different insertional speeds of an implant electrode in a cochlear model.Materials and Methods. The experiments were performed using an artificial cochlear model. A linear actuator was mounted on an Advanced Bionics IJ insertional tool. The intracochlear fluid pressure was recorded through a pressure sensor which was placed in the helicotrema area. Defined insertions were randomly performed with speeds of 0.1 mm/sec, 0.25 mm/sec, 0.5 mm/sec, 1 mm/sec, and 2 mm/sec.Results. A direct correlation between speed and pressure was observed. Mean maximum values of intracochlear fluid pressure varied between 0.41 mm Hg and 1.27 mm Hg.Conclusion. We provide the first results of fluid pressure changes due to insertional speeds of CI electrodes in a cochlear model. A relationship between the insertional speed and intracochlear fluid pressure was observed. Further experiments are needed to apply these results to the in vivo situation.

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Mittmann, P., A. Ernst, and I. Todt. "Intracochlear Pressure Changes due to Round Window Opening: A Model Experiment." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/341075.

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Анотація:

To preserve residual hearing in cochlea implantation, the electrode design has been refined and an atraumatic insertion of the cochlea electrode has become one aspect of cochlea implant research. The opening of the round window can be assumed to be a contributing factor in an atraumatic concept. The aim of our study was to observe intracochlear pressure changes due to different opening conditions of an artificial round window membrane. The experiments were performed in an artificial cochlea model. A round window was simulated with a polythene foil and a pressure sensor was placed in the helicotrema area to monitor intraluminal pressure changes. Openings of the artificial round window membrane were performed using different ways. Opening the artificial round window mechanically showed a biphasic behaviour of pressure change. Laser openings showed a unidirectional pressure change. The lowest pressure changes were observed when opening the artificial round window membrane using a diode laser. The highest pressure changes were seen when using a needle. The openings with the CO2laser showed a negative intracochlear pressure and a loss of fluid. In our model experiments, we could prove that the opening of the artificial round window membrane causes various intracochlear pressure changes.

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Більше джерел

Дисертації з теми "Intracochlear pressure"

Bell, James Andrew. "A study of frequency variations of spontaneous otoacoustic emissions from human ears." Master's thesis, 1998. http://hdl.handle.net/1885/9036.

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The majority of human ears are softly ringing. They are continuously emitting faint pure tones that can be detected with a sensitive microphone in the ear canal. Since Kemp (1979) first published a high resolution spectrum of this remarkable, although apparently normal, phenomenon (now called spontaneous otoacoustic emission, or SOAE), much research effort has gone into discovering the origin of these peculiar sounds. It seems clear that the sounds come from the cochlea and reflect the operation there of an active amplification system that endows the ear with its exquisite sensitivity and fine tuning. This thesis was a study of variations in the frequencies of spontaneous otoacoustic emissions, both on an hourly scale to discern if circadian rhythms existed, and on a daily scale in fertile women to examine possible menstrual-linked variations. Notably, regular variations in frequency were discovered. The amplitude of SOAEs varied widely, but no systematic variation could be detected. Regular circadian variations in frequency were found, typically showing a rise in frequency of 0.6-1% while asleep and a similar fall while awake. Consistent monthly variations, in step with the menstrual cycle, were also uncovered. The monthly cycle typically saw frequencies rise and fall by 0.4-0.6%, reaching a minimum near the onset of menstruation, and rising to a peak close to ovulation. An examination of the literature revealed that certain cardiovascular parameters, particularly arterial blood pressure, follow - over both daily and menstrual cycles - a broadly similar time course to SOAE frequency. Further experiments produced data supporting a relationship between blood pressure and SOAE frequency, and it is therefore concluded that much of the circadian-linked, menstrual-linked, and background variation in SOAE frequency may arise from cardiovascular changes. A likely causal mechanism, involving cerebrospinal fluid pressure, is put forward. It is speculated that the frequency-shifting effect of blood pressure is similar to that produced by the application of static pressure to the ear canal. In the latter, pressure is brought to bear on perilymph and SOAEs shift in frequency. In the former, blood pressure influences cerebrospinal fluid pressure (Cushing's phenomenon), and this is conducted, via the cochlear aqueduct, to the cochlea. The outcome is the same: a change in perilymphatic pressure which changes the frequency of SOAEs. Supporting this proposition, lying supine with head lowest raised emission frequencies. In addition, it is known that breathing and pulse are both detectable in cerebrospinal fluid pressure recordings, and the majority of seven subjects showed SOAE sidebands at 0.2-0.3 Hz and at approximately 1 Hz.

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Частини книг з теми "Intracochlear pressure"

Grossöhmichen, Martin, Rolf Salcher, Thomas Lenarz, and Hannes Maier. "Measurement of Intracochlear Pressure Differences in Human Temporal Bones Using an Off-the-Shelf Pressure Sensor." In Biomedical Technology, 335–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59548-1_18.

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Тези доповідей конференцій з теми "Intracochlear pressure"

Mittmann, P., G. Lauer, R. Seidl, and A. Ernst. "Intracochlear pressure changes during CI electrode insertion - modifications for minimizing intracochlear pressure." In Abstract- und Posterband – 91. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Welche Qualität macht den Unterschied. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1711133.

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Lauer, G., P. Mittmann, R. Seidl, S. Mutze, and A. Ernst. "Intracochlear pressure changes during CI electrode insertion - modifications for minimizing intracochlear pressure." In 100 JAHRE DGHNO-KHC: WO KOMMEN WIR HER? WO STEHEN WIR? WO GEHEN WIR HIN? Georg Thieme Verlag KG, 2021. http://dx.doi.org/10.1055/s-0041-1728387.

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Mittmann, P., R. Seidl, G. Lauer, and A. Ernst. "Intracochlear pressure changes during CI electrode insertion - modifications for minimizing intracochlear pressure." In 100 JAHRE DGHNO-KHC: WO KOMMEN WIR HER? WO STEHEN WIR? WO GEHEN WIR HIN? Georg Thieme Verlag KG, 2021. http://dx.doi.org/10.1055/s-0041-1728397.

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OLSON, E. S. "HARMONIC DISTORTION IN INTRACOCHLEAR PRESSURE: OBSERVATIONS AND INTERPRETATION." In Proceedings of the International Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704931_0033.

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Riemann, C., Lars-Uwe Scholtz, H. Sudhoff, and I. Todt. "Influence of internal factors on experimental intracochlear pressure measurement." In Abstract- und Posterband – 91. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Welche Qualität macht den Unterschied. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1711143.

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Todt, I., F. Ordonez, S. Müller, and H. Sudhoff. "Dynamic intracochlear pressure measurements during cochlear implant electrode insertion." In Abstract- und Posterband – 90. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Digitalisierung in der HNO-Heilkunde. Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-1686526.

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DONG, WEI, and ELIZABETH S. OLSON. "TUNING AND TRAVEL OF TWO TONE DISTORTION IN INTRACOCHLEAR PRESSURE." In Proceedings of the Ninth International Symposium. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773456_0007.

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NAKAJIMA, HIDEKO HEIDI, WEI DONG, ELIZABETH S. OLSON, SAUMIL N. MERCHANT, MICHAEL E. RAVICZ, and JOHN J. ROSOWSKI. "DIFFERENTIAL INTRACOCHLEAR SOUND PRESSURE MEASUREMENTS IN NORMAL HUMAN TEMPORAL BONES." In Proceedings of the 10th International Workshop on the Mechanics of Hearing. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789812833785_0004.

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Kale, Sushrut, and Elizabeth S. Olson. "Intracochlear pressure measurements in scala media inform models of cochlear mechanics." In MECHANICS OF HEARING: PROTEIN TO PERCEPTION: Proceedings of the 12th International Workshop on the Mechanics of Hearing. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4939354.

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Olson, Elizabeth S., and Hideko H. Nakajima. "A family of fiber-optic based pressure sensors for intracochlear measurements." In SPIE BiOS, edited by Bernard Choi, Nikiforos Kollias, Haishan Zeng, Hyun Wook Kang, Brian J. F. Wong, Justus F. Ilgner, Alfred Nuttal, et al. SPIE, 2015. http://dx.doi.org/10.1117/12.2178056.

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