scholarly journals Differential Intracochlear Sound Pressure Measurements in Human Temporal Bones with an Off-the-Shelf Sensor

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Martin Grossöhmichen ◽  
Rolf Salcher ◽  
Klaus Püschel ◽  
Thomas Lenarz ◽  
Hannes Maier
Keyword(s):  
Mechanical Stimulation ◽  
Pressure Sensor ◽  
Sound Pressure ◽  
Ossicular Chain ◽  
Acoustic Stimulation ◽  
Pressure Measurements ◽  
Output Level ◽  
Custom Made ◽  
Temporal Bones

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.

scholarly journals Intracochlear Sound Pressure Measurements in Normal Human Temporal Bones During Bone Conduction Stimulation

2018 ◽  
Vol 19 (5) ◽  
pp. 523-539 ◽  
Author(s):  
Christof Stieger ◽  
Xiying Guan ◽  
Rosemary B. Farahmand ◽  
Brent F. Page ◽  
Julie P. Merchant ◽  
...  
Keyword(s):  
Sound Pressure ◽  
Bone Conduction ◽  
Pressure Measurements ◽  
Normal Human ◽  
Temporal Bones

DIFFERENTIAL INTRACOCHLEAR SOUND PRESSURE MEASUREMENTS IN NORMAL HUMAN TEMPORAL BONES

2009 ◽  
Author(s):  
HIDEKO HEIDI NAKAJIMA ◽  
WEI DONG ◽  
ELIZABETH S. OLSON ◽  
SAUMIL N. MERCHANT ◽  
MICHAEL E. RAVICZ ◽  
...  
Keyword(s):  
Sound Pressure ◽  
Pressure Measurements ◽  
Normal Human ◽  
Temporal Bones

scholarly journals Evaluation of Round Window Stimulation Using the Floating Mass Transducer by Intracochlear Sound Pressure Measurements in Human Temporal Bones

2010 ◽  
Vol 31 (3) ◽  
pp. 506-511 ◽  
Author(s):  
Hideko Heidi Nakajima ◽  
Wei Dong ◽  
Elizabeth S. Olson ◽  
John J. Rosowski ◽  
Michael E. Ravicz ◽  
...  
Keyword(s):  
Sound Pressure ◽  
Round Window ◽  
Pressure Measurements ◽  
Temporal Bones

In vitro evaluation of a malleus head to stapes head ‘incus replica’ prosthesis

2001 ◽  
Vol 115 (2) ◽  
pp. 97-100 ◽  
Author(s):  
Robert Mills ◽  
Eric Abel ◽  
Richard Lord
Keyword(s):  
Ossicular Chain ◽  
Acoustic Stimulation ◽  
Laser Vibrometer ◽  
Ossicular Replacement ◽  
Series Of Experiments ◽  
Incudostapedial Joint ◽  
Set Up ◽  
Temporal Bones ◽  
Replacement Prosthesis

An ossicular prosthesis produced by making a mould from a cadaveric incus and injecting ionomeric cement into it (incus replica prosthesis, IRP) has been cemented to the malleus head and stapes head and evaluated in fresh human temporal bones using a laser vibrometer. Stapes velocity was recorded under acoustic stimulation and foot plate displacements were derived. Fourteen frequencies between 125 Hz and 8000 Hz have been used. Measurements were made with the ossicular chain intact, following removal of the incus, with the prosthesis cemented to the malleus, but not the stapes, and with the incudo-stapedial joint cemented. In a second series of experiments the performance of the IRP was compared with that of a Causse partial ossicular replacement prosthesis, using the same experimental set-up. The results indicate that the prosthesis performs almost as well as the intact ossicular chain and that cementing the incudostapedial joint gives better sound transmission than leaving it uncemented. In addition the IRP outperforms the conventional partial ossicular replacement prosthesis.

scholarly journals Differential Intracochlear Sound Pressure Measurements in Normal Human Temporal Bones

2008 ◽  
Vol 10 (1) ◽  
pp. 23-36 ◽  
Author(s):  
Hideko Heidi Nakajima ◽  
Wei Dong ◽  
Elizabeth S. Olson ◽  
Saumil N. Merchant ◽  
Michael E. Ravicz ◽  
...  
Keyword(s):  
Sound Pressure ◽  
Pressure Measurements ◽  
Normal Human ◽  
Temporal Bones

scholarly journals Round Window Reinforcement-Induced Changes in Intracochlear Sound Pressure

2021 ◽  
Vol 11 (11) ◽  
pp. 5062
Author(s):  
Nuwan Liyanage ◽  
Lukas Prochazka ◽  
Julian Grosse ◽  
Adrian Dalbert ◽  
Sonia Tabibi ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Sound Pressure ◽  
Numerical Models ◽  
Round Window ◽  
Acoustic Stimulation ◽  
Pressure Increase ◽  
Round Window Membrane ◽  
Superior Semicircular Canal Dehiscence ◽  
Experimental Findings ◽  
Temporal Bones

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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