Bone conduction in Thiel-embalmed cadaver heads

Guignard, Jérémie; Stieger, Christof; Kompis, Martin; Caversaccio, Marco; Arnold, A.

doi:10.1016/j.heares.2013.10.002

Cited by 26 publications

(25 citation statements)

References 37 publications

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“…The absolute values of the cochlear promontory vibrations are comparable to the measurements reported by others who stimulated on the skin covered bone on Thiel fixed heads (18), directly on the skull (20), or on skin covered bone on live human subjects (21). In Figure 5, the promontory accelerations with the steel headband used in this study (i.e., Heads 1-4) were normalized by the stimulation force to make comparisons with the promontory responses to force stimulation from a transducer screwed into the skull of cadaver heads (20) and mounted by a headband in live human subjects (21).…”

Section: Discussionsupporting

confidence: 89%

“…Measurements were performed in four cadaveric whole heads that gave a close approximation to the in vivo condition for the following reasons: the heads were stored according to a technique described by Thiel (13), in which there was no significant difference in biomechanical testing as compared with fresh frozen material (17,18). For measurements on BC pathways, dry skulls, temporal bones, and animals have been used in previous studies (4,5,9,19).…”

Section: Discussionmentioning

confidence: 99%

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Intracranial Pressure and Promontory Vibration With Soft Tissue Stimulation in Cadaveric Human Whole Heads

Röösli

Dobrev

Sim

et al. 2016

Otology &Amp; Neurotology

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HYPOTHESIS: Intracranial pressure and skull vibrations are correlated and depend on the stimulation position and frequency. BACKGROUND: A hearing sensation can be elicited by vibratory stimulation on the skin covered skull, or by stimulation on soft tissue such as the neck. It is not fully understood whether different stimulation sites induce the skull vibrations responsible for the perception or whether other transmission pathways are dominant. The aim of this study was to assess the correlation between intracranial pressure and skull vibration measured on the promontory for stimulation to different sites on the head. METHODS: Measurements were performed on four human cadaver heads. A bone conduction hearing aid was held in place with a 5-Newton steel headband at four locations (mastoid, forehead, eye, and neck). While stimulating in the frequency range of 0.3 to 10 kHz, acceleration of the cochlear promontory was measured with a Laser Doppler Vibrometer, and intracranial pressure at the center of the head with a hydrophone. RESULTS: Promontory acceleration and intracranial pressure was measurable for all stimulation sites. The ratios were comparable between all stimulation sites for frequencies below 2 kHz. CONCLUSION: These findings indicate that both promontory acceleration and intracranial pressure are involved for stimulation on the sites investigated. The transmission pathway of sound energy is comparable for the four stimulation sites. Originally published at: Roosli, Christof; Dobrev, Ivo; Sim, Jae Hoon; Gerig, Rahel; Pfiffner, Flurin; Stenfelt, Stefan; Huber, Alexander M (2016). Intracranial pressure and promontory vibration with soft tissue stimulation in cadaveric human whole heads. Otology Neurotology, 37(9):e384-e390.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Intracranial Pressure and Promontory Vibration With Soft Tissue Stimulation in Cadaveric Human Whole Heads

Röösli

Dobrev

Sim

et al. 2016

Otology &Amp; Neurotology

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“…Thiel embalming has the advantage of durability, which makes it possible to conduct experiments for long periods of time with reproducible results (Guignard et al, 2013).…”

Section: Authorsmentioning

confidence: 99%

Walter Thiel's Embalming Method: Review of Solutions and Applications in Different Fields of Biomedical Research

et al. 2016

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's embalming method. Review of solutions and applications in different fields of biomedical research. Int. J. Morphol., 34(4):1442Morphol., 34(4): -1454Morphol., 34(4): , 2016. SUMMARY:Walter Thiel developed the method that enables preservation of the body with natural colors in 1992. It consists in the application of an intravascular injection formula, and maintaining the corps submerged for a determinate period of time in the immersion solution in the pool. After immersion, it is possible to maintain the corps in a hermetically sealed container, thus avoiding dehydration outside the pool. The aim of this work was to review the Thiel method, searching all scientific articles describing this technique from its development point of view, and application in anatomy and morphology teaching, as well as in clinical and surgical practice. Most of these studies were carried out in Europe. We used PubMed, Ebsco and Embase databases with the terms "Thiel cadaver", "Thiel embalming", "Thiel embalming method" and we searched for papers that cited Thiel`s work. In comparison with methods commonly used with high concentrations of formaldehyde, this method lacks the emanation of noxious or irritating gases; gives the corps important passive joint mobility without stiffness; maintaining color, flexibility and tissue plasticity at a level equivalent to that of a living body. Furthermore, it allows vascular repletion at the capillary level. All this makes for great advantage over the formalinfixed and fresh material. Its multiple uses are applicable in anatomy teaching and research; teaching for undergraduates (prosection and dissection) and for training in surgical techniques for graduates and specialists (laparoscopies, arthroscopies, endoscopies).

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“…2012-0136). Measurements were made on four cadaveric whole human heads that were conserved using a technique described by Thiel (Thiel, 1992).This method does not significantly change the properties of the soft tissue (Guignard et al, 2013). An endaural incision was performed between the helix and the tragus to achieve access to the promontory.…”

Section: Preparation Of Specimenmentioning

confidence: 99%

Interaction between osseous and non-osseous vibratory stimulation of the human cadaveric head

et al. 2016

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Bone conduction (BC) stimulation can be applied by vibration to the bony or skin covered skull (osseous BC), or on soft tissue such as the neck (non-osseous BC). The interaction between osseous and non-osseous bone conduction pathways is assessed in this study. The relation between bone vibrations measured at the cochlear promontory and the intracranial sound pressure for stimulation directly on the dura and for stimulation at the mastoid between 0.2 and 10 kHz was compared. First, for stimulation on the dura, varying the static coupling force of the BC transducer on the dura had only a small effect on promontory vibration. Second, the presence or absence of intracranial fluid did not affect promontory vibration for stimulation on the dura. Third, stimulation on the mastoid elicited both promontory vibration and intracranial sound pressure. Stimulation on the dura caused intracranial sound pressure to a similar extent above 0.5 kHz compared to stimulation on the mastoid, while promontory vibration was less by 20-40 dB. From these findings, we conclude that intracranial sound pressure (non-osseous BC) only marginally affects bone vibrations measured on the promontory (osseous BC), whereas skull vibrations affect intracranial sound pressure. HIGHLIGHTS:• Promontory vibration (osseous bone conduction) and intracranial sound pressure (nonosseous bone conduction) were measured in human cadaveric whole heads in response to bone-conducted sound.• A bone conduction stimulator was attached either to the mastoid and placed on the dura without contacting surrounding bone.• Intracranial sound pressure was comparable > 500 Hz for both modes of stimulation.• Promontory vibration was less by 20-40 dB for stimulation on the dura.• Dura stimulation only marginally affects bone vibrations as measured on the promontory, whereas stimulation on the mastoid affects intracranial sound pressure.Hearing Research (in print) 2 ABSTRACTA vibratory stimulation such as bone conduction (BC) stimulus can be applied by stimulation on the bony skull, on the skin covered skull (osseous BC), or by stimulating soft tissue, i.e.neck (non-osseous BC). The interaction between osseous and non-osseous BC pathways is assessed in this study. The relation between bone vibrations measured at the cochlear promontory and the intracranial sound pressure for stimulation directly on the dura and for stimulation at the mastoid between 0.2 -10 kHz was compared. First, for stimulation on the dura, varying the static coupling force of the BC transducer on the dura only had a small effect on promontory vibration. Second, the presence or absence of intracranial fluid did not affect promontory vibration for stimulation on the dura. Third, stimulation on the mastoid elicited both promontory vibration and intracranial sound pressure. Stimulation on the dura caused intracranial sound pressure to a similar extent above 0.5 kHz compared to stimulation on the mastoid, while promontory vibration was less by 20-40 dB. From these findings, we conclude that intracrani...

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Bone conduction in Thiel-embalmed cadaver heads

Cited by 26 publications

References 37 publications

Intracranial Pressure and Promontory Vibration With Soft Tissue Stimulation in Cadaveric Human Whole Heads

Intracranial Pressure and Promontory Vibration With Soft Tissue Stimulation in Cadaveric Human Whole Heads

Walter Thiel's Embalming Method: Review of Solutions and Applications in Different Fields of Biomedical Research

Interaction between osseous and non-osseous vibratory stimulation of the human cadaveric head

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