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Статті в журналах з теми "Intracochlear pressure"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

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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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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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Анотація:

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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10

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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11

XU, LIFU, XINSHENG HUANG, NA TA, ZHUSHI RAO, and JIABIN TIAN. "FINITE ELEMENT MODELING OF THE HUMAN COCHLEA USING FLUID–STRUCTURE INTERACTION METHOD." Journal of Mechanics in Medicine and Biology 15, no. 03 (June 2015): 1550039. http://dx.doi.org/10.1142/s0219519415500396.

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In this paper, a 3D finite element (FE) model of human cochlea is developed. This passive model includes the structure of oval window, round window, basilar membrane (BM) and cochlear duct which is filled with fluid. Orthotropic material property of the BM is varying along its length. The fluid–structure interaction (FSI) method is used to compute the responses in the cochlea. In particular, the viscous fluid element is adopted for the first time in the cochlear FE model, so that the effects of shear viscosity in the fluid are considered. Results on the cochlear impedance, BM response and intracochlear pressure are obtained. The intracochlear pressure includes the scala vestibule and scala tympani pressure are extracted and used to calculate the transfer functions from equivalent ear canal pressures to scala pressures. The reasonable agreements between the model results and the experimental data in the literature prove the validity of the cochlear model for simulating sound transmission in the cochlea. Moreover, this model predicted the transfer function from equivalent ear canal pressures to scala pressures which is the input to the cochlear partition.

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12

Olson, Elizabeth S. "Intracochlear pressure measurements related to cochlear tuning." Journal of the Acoustical Society of America 110, no. 1 (July 2001): 349–67. http://dx.doi.org/10.1121/1.1369098.

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13

Greene, Nathaniel T., Jameson K. Mattingly, Renee M. Banakis Hartl, Daniel J. Tollin, and Stephen P. Cass. "Intracochlear Pressure Transients During Cochlear Implant Electrode Insertion." Otology & Neurotology 37, no. 10 (December 2016): 1541–48. http://dx.doi.org/10.1097/mao.0000000000001232.

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14

Banakis Hartl, Renee M., Christopher Kaufmann, Marlan R. Hansen, and Daniel J. Tollin. "Intracochlear Pressure Transients During Cochlear Implant Electrode Insertion." Otology & Neurotology 40, no. 6 (July 2019): 736–44. http://dx.doi.org/10.1097/mao.0000000000002164.

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15

Greene, Nathaniel T., Mohamed A. Alhussaini, James R. Easter, Theodore F. Argo, Tim Walilko, and Daniel J. Tollin. "Intracochlear pressure measurements during acoustic shock wave exposure." Hearing Research 365 (August 2018): 149–64. http://dx.doi.org/10.1016/j.heares.2018.05.014.

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16

Huang, Stanley, Wei Dong, and Elizabeth S. Olson. "Subharmonic Distortion in Ear Canal Pressure and Intracochlear Pressure and Motion." Journal of the Association for Research in Otolaryngology 13, no. 4 (April 24, 2012): 461–71. http://dx.doi.org/10.1007/s10162-012-0326-3.

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17

Liyanage, Nuwan, Lukas Prochazka, Julian Grosse, Adrian Dalbert, Sonia Tabibi, Michail Chatzimichalis, Ivo Dobrev, Tobias Kleinjung, Alexander Huber, and Flurin Pfiffner. "Round Window Reinforcement-Induced Changes in Intracochlear Sound Pressure." Applied Sciences 11, no. 11 (May 30, 2021): 5062. http://dx.doi.org/10.3390/app11115062.

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Introduction: The round window membrane (RWM) acts as a pressure-relieving membrane for incompressible cochlear fluid. The reinforcement of the RWM has been used as a surgical intervention for the treatment of superior semicircular canal dehiscence and hyperacusis. The aim of this study was to investigate how RWM reinforcement affects sound pressure variations in the cochlea. Methods: The intracochlear sound pressure (ICSP) was simultaneously measured in the scala tympani (ST) and scala vestibuli (SV) of cadaveric human temporal bones (HTBs) in response to acoustic stimulation for three RWM reinforcement materials (soft tissue, cartilage, and medical-grade silicone). Results: The ICSP in the ST was significantly increased after RWM reinforcement for frequencies below 2 kHz. Between 400 and 600 Hz, all three materials demonstrated the highest median pressure increase. The higher the RWM stiffness, the larger the pressure increase: silicone (7 dB) < soft tissue (10 dB) < cartilage (13 dB). The ICSP in the SV was less affected by reinforcement. The highest median pressure increase was 3 dB. The experimental findings can be explained with numerical models of cochlear mechanics. Discussion and conclusions: RWM reinforcement increases the sound pressure in ST at lower frequencies but only has a minor influence on the SV pressure.

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18

Ordonez, F., C. Riemann, S. Mueller, H. Sudhoff, and I. Todt. "Dynamic intracochlear pressure measurement during cochlear implant electrode insertion." Acta Oto-Laryngologica 139, no. 10 (July 12, 2019): 860–65. http://dx.doi.org/10.1080/00016489.2019.1640391.

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19

Marchbanks, R. J., A. Reid, A. M. Martin, A. P. Brightwell, and D. Bateman. "The effect of raised intracranial pressure on intracochlear fluid pressure: Three case studies." British Journal of Audiology 21, no. 2 (January 1987): 127–30. http://dx.doi.org/10.3109/03005368709077785.

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20

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." Journal of the Association for Research in Otolaryngology 10, no. 1 (December 9, 2008): 23–36. http://dx.doi.org/10.1007/s10162-008-0150-y.

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21

Yoon, Yong-Jin, Sunil Puria, and Charles R. Steele. "Intracochlear pressure and derived quantities from a three-dimensional model." Journal of the Acoustical Society of America 122, no. 2 (August 2007): 952–66. http://dx.doi.org/10.1121/1.2747162.

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22

Meenderink, Sebastiaan W. F., and Marcel van der Heijden. "Reverse Cochlear Propagation in the Intact Cochlea of the Gerbil: Evidence for Slow Traveling Waves." Journal of Neurophysiology 103, no. 3 (March 2010): 1448–55. http://dx.doi.org/10.1152/jn.00899.2009.

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Анотація:

The inner ear can produce sounds, but how these otoacoustic emissions back-propagate through the cochlea is currently debated. Two opposing views exist: fast pressure waves in the cochlear fluids and slow traveling waves involving the basilar membrane. Resolving this issue requires measuring the travel times of emissions from their cochlear origin to the ear canal. This is problematic because the exact intracochlear location of emission generation is unknown and because the cochlea is vulnerable to invasive measurements. We employed a multi-tone stimulus optimized to measure reverse travel times. By exploiting the dispersive nature of the cochlea and by combining acoustic measurements in the ear canal with recordings of the cochlear-microphonic potential, we were able to determine the group delay between intracochlear emission-generation and their recording in the ear canal. These delays remained significant after compensating for middle-ear delay. The results contradict the hypothesis that the reverse propagation of emissions is exclusively by direct pressure waves.

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23

Olson, Elizabeth S. "Observing middle and inner ear mechanics with novel intracochlear pressure sensors." Journal of the Acoustical Society of America 103, no. 6 (June 1998): 3445–63. http://dx.doi.org/10.1121/1.423083.

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24

Kale, Sushrut S., and Elizabeth S. Olson. "Intracochlear Scala Media Pressure Measurement: Implications for Models of Cochlear Mechanics." Biophysical Journal 109, no. 12 (December 2015): 2678–88. http://dx.doi.org/10.1016/j.bpj.2015.10.052.

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25

TIAN, JIABIN, XINSHENG HUANG, ZHUSHI RAO, NA TA, and LIFU XU. "FINITE ELEMENT ANALYSIS OF THE EFFECT OF ACTUATOR COUPLING CONDITIONS ON ROUND WINDOW STIMULATION." Journal of Mechanics in Medicine and Biology 15, no. 04 (August 2015): 1550048. http://dx.doi.org/10.1142/s0219519415500487.

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The finite element (FE) method was used to analyze the effect of coupling conditions between the actuator and the round window membrane (RWM) on the performance of round window (RW) stimulation. A FE model of the human ear consisting of the external ear canal, middle ear and cochlea was firstly developed, and then validation of this model was accomplished through comparison between analytical results and experimental data in the literature. Intracochlear pressure were derived from the model under normal forward sound stimulation and reverse RW stimulation. The equivalent sound pressure of RW stimulation was then calculated via comparing the differential intracochlear pressure produced by the actuator and normal ear canal sound stimulus. The actuator was simulated as a floating mass and placed onto the middle ear cavity side of RWM. Two aspects about the actuator coupling conditions were considered in this study: (1) the cross-section area of the actuator relative to the RWM; (2) the coupling layer between the actuator and the RWM. The results show that smaller actuator size can improve the implant performance of RW stimulation, and size requirements of the actuator can also be reduced by introducing a coupling layer between the actuator and RWM, which will benefit the manufacture of the actuator.

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26

Plontke, Stefan K., Jared J. Hartsock, Ruth M. Gill, and Alec N. Salt. "Intracochlear Drug Injections through the Round Window Membrane: Measures to Improve Drug Retention." Audiology and Neurotology 21, no. 2 (2016): 72–79. http://dx.doi.org/10.1159/000442514.

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The goal of this study was to develop an appropriate methodology to apply drugs quantitatively to the perilymph of the ear. Intratympanic applications of drugs to the inner ear often result in variable drug levels in the perilymph and can only be used for molecules that readily permeate the round window (RW) membrane. Direct intracochlear and intralabyrinthine application procedures for drugs, genes or cell-based therapies bypass the tight boundaries at the RW, oval window, otic capsule and the blood-labyrinth barrier. However, perforations can release inner ear pressure, allowing cerebrospinal fluid (CSF) to enter through the cochlear aqueduct, displacing the injected drug solution into the middle ear. Two markers, fluorescein or fluorescein isothiocyanate-labeled dextran, were used to quantify how much of an injected substance was retained in the cochlear perilymph following an intracochlear injection. We evaluated whether procedures to mitigate fluid leaks improved marker retention in perilymph. Almost all procedures to reduce volume efflux, including the use of gel for internal sealing and glue for external sealing of the injection site, resulted in improved retention of the marker in perilymph. Adhesive on the RW membrane effectively prevented leaks but also influenced fluid exchange between CSF and perilymph. We conclude that drugs can be delivered to the ear in a consistent, quantitative manner using intracochlear injections if care is taken to control the fluid leaks that result from cochlear perforation.

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27

Banakis Hartl, Renee M., and Nathaniel T. Greene. "Measurement and Mitigation of Intracochlear Pressure Transients During Cochlear Implant Electrode Insertion." Otology & Neurotology 43, no. 2 (November 9, 2021): 174–82. http://dx.doi.org/10.1097/mao.0000000000003401.

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28

Mittmann, Philipp, Marlene Mittmann, Arneborg Ernst, and Ingo Todt. "Intracochlear Pressure Changes due to 2 Electrode Types: An Artificial Model Experiment." Otolaryngology–Head and Neck Surgery 156, no. 4 (December 27, 2016): 712–16. http://dx.doi.org/10.1177/0194599816684104.

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29

Mittmann, Marlene, Arneborg Ernst, Philipp Mittmann, and Ingo Todt. "Insertional depth-dependent intracochlear pressure changes in a model of cochlear implantation." Acta Oto-Laryngologica 137, no. 2 (August 30, 2016): 113–18. http://dx.doi.org/10.1080/00016489.2016.1219918.

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30

Yoon, Yong-Jin, Jong Dae Baek, Choongsoo Shin, and Joo Hyun Lee. "Intracochlear fluid pressure and cochlear input impedance from push-pull amplification model." International Journal of Precision Engineering and Manufacturing 13, no. 9 (September 2012): 1689–95. http://dx.doi.org/10.1007/s12541-012-0221-1.

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31

Peacock, John, Mohamed Al Hussaini, Nathaniel T. Greene, and Daniel J. Tollin. "Intracochlear pressure in response to high intensity, low frequency sounds in chinchilla." Hearing Research 367 (September 2018): 213–22. http://dx.doi.org/10.1016/j.heares.2018.06.013.

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32

Bowling, Thomas, and Julien Meaud. "Forward and Reverse Waves: Modeling Distortion Products in the Intracochlear Fluid Pressure." Biophysical Journal 114, no. 3 (February 2018): 747–57. http://dx.doi.org/10.1016/j.bpj.2017.12.005.

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33

Creighton, Francis (Pete) X., Xiying Guan, Steve Park, Ioannis (John) Kymissis, Hideko Heidi Nakajima, and Elizabeth S. Olson. "An Intracochlear Pressure Sensor as a Microphone for a Fully Implantable Cochlear Implant." Otology & Neurotology 37, no. 10 (December 2016): 1596–600. http://dx.doi.org/10.1097/mao.0000000000001209.

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34

Magnan, Pascal, Armand Dancer, Rudolf Probst, Jacek Smurzynski, and Paul Avan. "Intracochlear Acoustic Pressure Measurements: Transfer Functions of the Middle Ear and Cochlear Mechanics." Audiology and Neurotology 4, no. 3-4 (1999): 123–28. http://dx.doi.org/10.1159/000013830.

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35

Büki, Béla, Emile de Kleine, Hero P. Wit, and Paul Avan. "Detection of intracochlear and intracranial pressure changes with otoacoustic emissions: a gerbil model." Hearing Research 167, no. 1-2 (May 2002): 180–91. http://dx.doi.org/10.1016/s0378-5955(02)00392-1.

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36

Stieger, Christof, Xiying Guan, Rosemary B. Farahmand, Brent F. Page, Julie P. Merchant, Defne Abur, and Hideko Heidi Nakajima. "Intracochlear Sound Pressure Measurements in Normal Human Temporal Bones During Bone Conduction Stimulation." Journal of the Association for Research in Otolaryngology 19, no. 5 (August 31, 2018): 523–39. http://dx.doi.org/10.1007/s10162-018-00684-1.

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37

Olson, Elizabeth S. "Harmonic distortion in intracochlear pressure and its analysis to explore the cochlear amplifier." Journal of the Acoustical Society of America 115, no. 3 (March 2004): 1230–41. http://dx.doi.org/10.1121/1.1645611.

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38

Yoon, Yong-Jin, Sunil Puria, and C. R. Steele. "Intracochlear Pressure and Organ of Corti Impedance from a Linear Active Three-Dimensional Model." ORL 68, no. 6 (2006): 365–72. http://dx.doi.org/10.1159/000095279.

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Dong, Wei. "Simultaneous Intracochlear Pressure Measurements from Two Cochlear Locations: Propagation of Distortion Products in Gerbil." Journal of the Association for Research in Otolaryngology 18, no. 2 (December 1, 2016): 209–25. http://dx.doi.org/10.1007/s10162-016-0602-8.

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Greene, Nathaniel T., Herman A. Jenkins, Daniel J. Tollin, and James R. Easter. "Stapes displacement and intracochlear pressure in response to very high level, low frequency sounds." Hearing Research 348 (May 2017): 16–30. http://dx.doi.org/10.1016/j.heares.2017.02.002.

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Pfiffner, Flurin, Lukas Prochazka, Ivo Dobrev, Karina Klein, Patrizia Sulser, Dominik Péus, Jae Sim, et al. "Proof of Concept for an Intracochlear Acoustic Receiver for Use in Acute Large Animal Experiments." Sensors 18, no. 10 (October 21, 2018): 3565. http://dx.doi.org/10.3390/s18103565.

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Анотація:

(1) Background: The measurement of intracochlear sound pressure (ICSP) is relevant to obtain better understanding of the biomechanics of hearing. The goal of this work was a proof of concept of a partially implantable intracochlear acoustic receiver (ICAR) fulfilling all requirements for acute ICSP measurements in a large animal. The ICAR was designed not only to be used in chronic animal experiments but also as a microphone for totally implantable cochlear implants (TICI). (2) Methods: The ICAR concept was based on a commercial MEMS condenser microphone customized with a protective diaphragm that provided a seal and optimized geometry for accessing the cochlea. The ICAR was validated under laboratory conditions and using in-vivo experiments in sheep. (3) Results: For the first time acute ICSP measurements were successfully performed in a live specimen that is representative of the anatomy and physiology of the human. Data obtained are in agreement with published data from cadavers. The surgeons reported high levels of ease of use and satisfaction with the system design. (4) Conclusions: Our results confirm that the developed ICAR can be used to measure ICSP in acute experiments. The next generation of the ICAR will be used in chronic sheep experiments and in TICI.

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Niesten, Marlien E. F., Christof Stieger, Daniel J. Lee, Julie P. Merchant, Wilko Grolman, John J. Rosowski, and Hideko Heidi Nakajima. "Assessment of the Effects of Superior Canal Dehiscence Location and Size on Intracochlear Sound Pressures." Audiology and Neurotology 20, no. 1 (December 13, 2014): 62–71. http://dx.doi.org/10.1159/000366512.

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Superior canal dehiscence (SCD) is a defect in the bony covering of the superior semicircular canal. Patients with SCD present with a wide range of symptoms, including hearing loss, yet it is unknown whether hearing is affected by parameters such as the location of the SCD. Our previous human cadaveric temporal bone study, utilizing intracochlear pressure measurements, generally showed that an increase in dehiscence size caused a low-frequency monotonic decrease in the cochlear drive across the partition, consistent with increased hearing loss. This previous study was limited to SCD sizes including and smaller than 2 mm long and 0.7 mm wide. However, the effects of larger SCDs (>2 mm long) were not studied, although larger SCDs are seen in many patients. Therefore, to answer the effect of parameters that have not been studied, this present study assessed the effect of SCD location and the effect of large-sized SCDs (>2 mm long) on intracochlear pressures. We used simultaneous measurements of sound pressures in the scala vestibuli and scala tympani at the base of the cochlea to determine the sound pressure difference across the cochlear partition - a measure of the cochlear drive in a temporal bone preparation - allowing for assessment of hearing loss. We measured the cochlear drive before and after SCDs were made at different locations (e.g. closer to the ampulla of the superior semicircular canal or closer to the common crus) and for different dehiscence sizes (including larger than 2 mm long and 0.7 mm wide). Our measurements suggest the following: (1) different SCD locations result in similar cochlear drive and (2) larger SCDs produce larger decreases in cochlear drive at low frequencies. However, the effect of SCD size seems to saturate as the size increases above 2-3 mm long and 0.7 mm wide. Although the monotonic effect was generally consistent across ears, the quantitative amount of change in cochlear drive due to dehiscence size varied across ears. Additionally, the size of the dehiscence above which the effect on hearing saturated varied across ears. These findings show that the location of the SCD does not generally influence the amount of hearing loss and that SCD size can help explain some of the variability of hearing loss in patients. i 2014 S. Karger AG, Basel

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Rouleau, Michael, and Julien Meaud. "Modeling the spatial variations of the intracochlear fluid pressure based on in vivo mechanical measurements." Journal of the Acoustical Society of America 146, no. 4 (October 2019): 2833. http://dx.doi.org/10.1121/1.5136816.

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Péus, Dominik, Ivo Dobrev, Lukas Prochazka, Konrad Thoele, Adrian Dalbert, Andreas Boss, Nicolas Newcomb, et al. "Sheep as a large animal ear model: Middle-ear ossicular velocities and intracochlear sound pressure." Hearing Research 351 (August 2017): 88–97. http://dx.doi.org/10.1016/j.heares.2017.06.002.

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Borgers, Charlotte, Guy Fierens, Tristan Putzeys, Astrid van Wieringen, and Nicolas Verhaert. "Reducing Artifacts in Intracochlear Pressure Measurements to Study Sound Transmission by Bone Conduction Stimulation in Humans." Otology & Neurotology 40, no. 9 (October 2019): e858-e867. http://dx.doi.org/10.1097/mao.0000000000002394.

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Avan, Paul, Pascal Magnan, Jacek Smurzynski, Rudolf Probst, and Armand Dancer. "Direct evidence of cubic difference tone propagation by intracochlear acoustic pressure measurements in the guinea-pig." European Journal of Neuroscience 10, no. 5 (May 1998): 1764–70. http://dx.doi.org/10.1046/j.1460-9568.1998.00188.x.

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de La Rochefoucauld, O., W. F. Decraemer, S. M. Khanna, and E. S. Olson. "Simultaneous Measurements of Ossicular Velocity and Intracochlear Pressure Leading to the Cochlear Input Impedance in Gerbil." Journal of the Association for Research in Otolaryngology 9, no. 2 (May 6, 2008): 161–77. http://dx.doi.org/10.1007/s10162-008-0115-1.

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HORNER, K., and Y. CAZALS. "THE EFFECTS OF EXPERIMENTAL HYDROPS VERSUS INCREASED INTRACOCHLEAR PRESSURE ON AUDITORY FUNCTION IN THE GUINEA PIG." Le Journal de Physique Colloques 51, no. C2 (February 1990): C2–119—C2–122. http://dx.doi.org/10.1051/jphyscol:1990228.

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Crohan, William, Jay Krishnaswamy, and Gunesh Rajan. "The Effects of Gusher-Related Intracochlear Pressure Changes on Hearing Preservation in Cochlear Implantation: A Comparative Series." Audiology and Neurotology 23, no. 3 (2018): 181–86. http://dx.doi.org/10.1159/000489599.

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Aim: To investigate and compare residual hearing preservation between patients based on the presence of intraoperative gusher. Methodology: We retrospectively compared 2 cohorts of cochlear implant recipients significantly distinguished by whether or not they experienced gusher intraoperatively. Patients underwent cochlear implantation using 24-mm lateral wall electrode arrays as well pharmacologic steroid protection. All patients were assessed by a hearing implant MDT. Hearing preservation rates and speech perception outcomes were assessed at 1, 6, 12, 24, 36, 48, and 60 months. Results: The patients with no gusher demonstrated complete hearing preservation. The patients with gusher demonstrated significant postoperative reduction of hearing thresholds, which declined at a significantly higher pace during follow-up. All patients demonstrated significantly better speech performance after cochlear implantation. Conclusion: The present study suggests that intraoperative gusher is associated with a significant drop in residual hearing, both immediately and over time, which may be related to the large change in intracochlear pressure intraoperatively.

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Dong, Wei, and Elizabeth S. Olson. "Middle Ear Forward and Reverse Transmission in Gerbil." Journal of Neurophysiology 95, no. 5 (May 2006): 2951–61. http://dx.doi.org/10.1152/jn.01214.2005.

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The middle ear transmits environmental sound to the inner ear. It also transmits acoustic energy sourced within the inner ear out to the ear canal, where it can be detected with a sensitive microphone as an otoacoustic emission. Otoacoustic emissions are an important noninvasive measure of the condition of sensory hair cells and to use them most effectively one must know how they are shaped by the middle ear. In this contribution, forward and reverse transmissions through the middle ear were studied by simultaneously measuring intracochlear pressure in scala vestibuli near the stapes and ear canal pressure. Measurements were made in gerbil, in vivo, with acoustic two-tone stimuli. The forward transmission pressure gain was about 20–25 dB, with a phase–frequency relationship that could be fit by a straight line, and was thus characteristic of a delay, over a wide frequency range. The forward delay was about 32 μs. The reverse transmission pressure loss was on average about 35 dB, and the phase–frequency relationship was again delaylike with a delay of about 38 μs. Therefore to a first approximation the middle ear operates similarly in the forward and reverse directions. The observation that the amount of pressure reduction in reverse transmission was greater than the amount of pressure gain in forward transmission suggests that complex motions of the tympanic membrane and ossicles affect reverse more than forward transmission.

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