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Djinović Z, Pavelka R, Tomić M, Sprinzl G, Müller JG, Traxler H. Experimental study of an implantable fiber-optic microphone on human cadavers. Hear Res 2021; 410:108351. [PMID: 34551371 DOI: 10.1016/j.heares.2021.108351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 08/17/2021] [Accepted: 09/01/2021] [Indexed: 11/18/2022]
Abstract
In this paper, we present the results of an experimental study about a novel fiber optical vibrometer, aimed to be used as a totally implantable fiber-optic microphone for hearing aids. The sensor head, implanted inside the human cadaver middle ear, detects the amplitude of the incus vibrations, which are produced by an external acoustical source. The probe beam of coherent vertical cavity surface emitting laser (VCSEL) radiation is directed to the incus and the phase-modulated reflected beam is captured and demodulated. The problem of interferometric fading was solved using two quasi-quadrature signals, passively produced by the 3 × 3 single-mode fiber-optic coupler, processed by a special embedded algorithm. The implanted optoelectronic module works with very low-power consumption, performs real-time signal processing and outputs an analogue signal proportional to the incus vibration. The amplitude of the incus vibrations at different sound pressure levels (SPL) from 40 to 90 dB and at frequencies from 100 Hz to 10 kHz were measured by the implanted system. The system was evaluated on five cadaver skulls. The measured amplitudes were in the range of 1 pm to 5 nm, depending on the subjected skull and the applied sound pressure.
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Affiliation(s)
- Zoran Djinović
- ACMIT Gmbh, Viktor Kaplan Str. 2, Wiener Neustadt 2700, Austria.
| | - Robert Pavelka
- ENT specialist, Grünbeckgasse 15, Wiener Neustadt 2700, Austria
| | - Miloš Tomić
- Institute of Technical Sciences of SASA, Kneza Mihaila 35, Belgrade 11000, Serbia
| | - Georg Sprinzl
- University Hospital St. Pölten, Dunantplatz 1, St. Pölten 3100, Austria
| | - Julia Gertrud Müller
- Medical University of Vienna, Department of Anatomy, Centre for Anatomy and Cell Biology, Waehringerstrasse 13, Vienna 1090, Austria
| | - Hannes Traxler
- Medical University of Vienna, Department of Anatomy, Centre for Anatomy and Cell Biology, Waehringerstrasse 13, Vienna 1090, Austria
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Ultradian Biorhythms of C57BL/6 Mice Body Temperature under Constant Illumination or during Natural Day-Night Cycle. Bull Exp Biol Med 2020; 169:388-392. [PMID: 32748138 DOI: 10.1007/s10517-020-04893-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Indexed: 02/02/2023]
Abstract
The study analyzed the dynamics of intraperitoneal body temperature in C57BL/6 mice during 39 days of uninterrupted measurements. When mice were exposed to constant illumination, the ultradian oscillations of body temperature demonstrated the rhythms with periods of 2 h, 60 min, and 12 min, which were the higher harmonics of the circadian temperature oscillations. In two mutually isolated groups exposed to constant illumination, the phases of revealed biorhythms coincided. When the mice maintained under natural illumination, the body temperature demonstrated the ultradian rhythms with the same periods, which indicated that constant illumination did not distort the parameters of ultradian biorhythms. Probably, there is an external biotropic factor with similar harmonic spectrum, which synchronizes these biorhythms.
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Kim YY, Chao JR, Kim C, Kang TC, Park HS, Chang J, Suh JG, Lee JH. Applicability of vital staining and tissue clearing to vascular anatomy and melanocytes' evaluation of temporal bone in six laboratory species. Anat Histol Embryol 2019; 48:296-305. [PMID: 30916435 DOI: 10.1111/ahe.12440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 02/11/2019] [Accepted: 02/26/2019] [Indexed: 12/14/2022]
Abstract
The purpose of the present study was to define the applicability of tissue clearing to the field of otology. We combined tissue clearing with vital staining perfusion via a pumping system to examine the vascular anatomy of temporal bones in laboratory animals. We used six different types of species including Korean wild mouse, mouse, Mongolian gerbil, hamsters and Guinea pigs. A mixture of Alcian blue reagent and 4% paraformaldehyde was circulated throughout the entire circulatory system of the animal via a perfusion pump system. Transparency images were obtained from the temporal bones according to the protocol of the SunHyun 3D Imaging Kit. In examining the inner surface of the tympanic membrane, flaccid part (pars flaccida) was positioned along the entire marginal area in Guinea pig. In the Guinea pig, unlike the other species, the cortical bone of the mastoid (bullae) was easily removed using cold instruments, allowing a direct approach to the enclosed structures. The distribution and pattern of cochlea melanocytes were compared among the species. "Mobius strip"-like accumulated melanocytes in vestibules were shown in both the Korean wild mouse and mouse. The collateral blood supply to the cochlea in six different species was checked in various pattern. Combining dye infusion with tissue-clearing techniques, we documented the middle ear and transparent inner ear structures in six different species. The information and associated images will help other researchers to develop hypotheses and design experimental investigations.
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Affiliation(s)
- Yoo Yeon Kim
- Department of Medical Genetics, College of Medicine, Hallym University, Chuncheon, Korea
| | - Janet Ren Chao
- Division of Otolaryngology, Department of Surgery, Yale School of Medicine, New Haven, Connecticut
| | - Chulho Kim
- Department of Neurology, Chuncheon Sacred Heart Hospital, Hallym University, Chuncheon, Korea
| | - Tae-Cheon Kang
- Department of Anatomy and Neurobiology, College of Medicine, Hallym University, Chuncheon, Korea
| | - Hae Sang Park
- Institute of New Frontier Research, Hallym University College of Medicine, Chuncheon, Korea.,Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Hallym University, Chuncheon, Korea
| | - Jiwon Chang
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Hallym University, Chuncheon, Korea
| | - Jun-Gyo Suh
- Department of Medical Genetics, College of Medicine, Hallym University, Chuncheon, Korea
| | - Jun Ho Lee
- Institute of New Frontier Research, Hallym University College of Medicine, Chuncheon, Korea.,Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Hallym University, Chuncheon, Korea
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In-vitro and in-vivo measurement of the animal's middle ear acoustical response by partially implantable fiber-optic sensing system. Biosens Bioelectron 2018; 103:176-181. [DOI: 10.1016/j.bios.2017.12.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Revised: 11/25/2017] [Accepted: 12/08/2017] [Indexed: 11/23/2022]
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Tomic MC, Djinovic ZV, Petricevic SJ. Demodulation of quasi-quadrature interferometric signals for use in the totally implantable hearing aids. BIOMEDICAL OPTICS EXPRESS 2017; 8:3404-3409. [PMID: 28717576 PMCID: PMC5508837 DOI: 10.1364/boe.8.003404] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 06/15/2017] [Accepted: 06/18/2017] [Indexed: 06/07/2023]
Abstract
We propose and experimentally prove an algorithm for demodulation of interferometric signals, modified for use in a totally implantable hearing aid device. A fiber optic configuration, which generates two quasi-quadrature signals by a passive 3x3 coupler, for a non-contact detection of the middle ear ossicle vibration is employed. We simulated the ossicle vibration and large movements and demonstrated the effectiveness of the algorithm to compensate changes of the signal DC values and the phase shift introduced by the coupler. Applying the proposed algorithm we obtained the output signal stability better than 0.5 dB, and the system equivalent input noise of about 31 dB (A) SPL @ 1 kHz.
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Affiliation(s)
- Milos C. Tomic
- School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia
| | | | - Slobodan J. Petricevic
- School of Electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia
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Didyk L, Gorgo Y, Prigancova A, Tunyi I, Vaczyova M, Mamilov S, Dirckx J. The Effects of Atmospheric Pressure Fluctuations on Human Behaviour Related to Injury Occurrences: Study on the Background of Low and Moderate Levels of Geomagnetic Activity. ACTA ACUST UNITED AC 2012. [DOI: 10.5402/2012/791524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The effects of slight atmospheric pressure fluctuations (APFs) within two ranges of periods attributed mostly to far infrasound (3 s–120 s) and internal gravity waves (120 s–1200 s) on human behaviour related to injury occurrences, within the one-year interval, are examined. Special interest is paid to the analysis of combined effects of APFs and geomagnetic activity (GMA) attributed to low and moderate levels. The relations between the daily number of emergency transport events due to sport injuries (EEI) and daily mean of APF integral amplitudes within the two ranges (DHAI and DHAG, resp.) along with the planetary geomagnetic index Ap are analysed using the regression models based on categorization. As shown, the high DHAI is a rather strong meteorotropic factor, being of relevance to increase in the incidence of sport injuries. The high DHAG appears to be of opposite sense on the background of low DHAI, promoting the decreased EEI number. The consideration of combined effects of the APF and GMA reveals that the negative effects of high DHAI are more pronounced in combination with low Ap levels. The results are discussed from the viewpoint of the necessity of further medico-meteorological studies using databases of most disturbed geophysical conditions.
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Affiliation(s)
- Lyudmyla Didyk
- Institute of Physics, National Academy of Sciences of Ukraine, Prospekt Nauki, 46, Kyiv 03028, Ukraine
| | - Yuriy Gorgo
- Institute of Applied Problems of Physics and Biophysics, National Academy of Sciences of Ukraine, Slugbova Street, 3, Kyiv 03142, Ukraine
| | - Alina Prigancova
- Geophysical Institute, Slovak Academies of Sciences, Dubravska cesta 9, 845 28 Bratislava, Slovakia
| | - Igor Tunyi
- Geophysical Institute, Slovak Academies of Sciences, Dubravska cesta 9, 845 28 Bratislava, Slovakia
| | - Magdalena Vaczyova
- Geophysical Institute, Slovak Academies of Sciences, Dubravska cesta 9, 845 28 Bratislava, Slovakia
| | - Sergey Mamilov
- Institute of Applied Problems of Physics and Biophysics, National Academy of Sciences of Ukraine, Slugbova Street, 3, Kyiv 03142, Ukraine
| | - Joris Dirckx
- Laboratory of Biomedical Physics, University of Antwerp, Groenenborgerlaan, 171, 2020 Antwerp, Belgium
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Didyk LA, Gorgo YP, Dirckx JJJ, Bogdanov VB, Buytaert JAN, Lysenko VA, Didyk NP, Vershygora AV, Erygina VT. Atmospheric pressure fluctuations in the far infrasound range and emergency transport events coded as circulatory system diseases. INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2008; 52:553-561. [PMID: 18523813 DOI: 10.1007/s00484-008-0163-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2007] [Revised: 03/17/2008] [Accepted: 04/28/2008] [Indexed: 05/26/2023]
Abstract
This study examines whether a relation exists between rapid atmospheric pressure fluctuations, attributed to the far infrasound frequency range (APF), and a number of emergency transport events coded as circulatory system diseases (EEC). Over an entire year, the average integral amplitudes of APF in the range of periods from 3 s to 120 s over each hour (HA) were measured. Daily dynamics of HA averaged over the year revealed a wave shape with smooth increase from night to day followed by decrease from day to night. The total daily number of EEC within the city of Kiev, Ukraine, was related to the daily mean of HA (DHA) and to the ratio of HA averaged over the day time to HA averaged over the night time (Rdn), and was checked for confounding effects of classical meteorological variables through non-parametric regression algorithms. The number of EEC were significantly higher on days with high DHA (3.72-11.07 Pa, n = 87) compared to the low DHA (0.7-3.62 Pa, n = 260, p = 0.01), as well at days with low Rdn (0.21-1.64, n = 229) compared to the high Rdn (1.65-7.2, n = 118, p = 0.03). A difference between DHA and Rdn effects on the emergency events related to different categories of circulatory diseases points to a higher sensitivity of rheumatic and cerebro-vascular diseases to DHA, and ischaemic and hypertensive diseases to Rdn. Results suggest that APF could be considered as a meteorotropic factor capable of influencing circulatory system diseases.
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Affiliation(s)
- L A Didyk
- Institute of Physics, National Academy of Sciences of Ukraine, Pr. Nauki 46, Kiev, Ukraine.
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Dirckx JJJ, Aernouts JEF, Aerts JRM. High resolution gas volume change sensor. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:054705. [PMID: 17552850 DOI: 10.1063/1.2737778] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Changes of gas quantity in a system can be measured either by measuring pressure changes or by measuring volume changes. As sensitive pressure sensors are readily available, pressure change is the commonly used technique. In many physiologic systems, however, buildup of pressure influences the gas exchange mechanisms, thus changing the gas quantity change rate. If one wants to study the gas flow in or out of a biological gas pocket, measurements need to be done at constant pressure. In this article we present a highly sensitive sensor for quantitative measurements of gas volume change at constant pressure. The sensor is based on optical detection of the movement of a droplet of fluid enclosed in a capillary. The device is easy to use and delivers gas volume data at a rate of more than 15 measurements/s and a resolution better than 0.06 microl. At the onset of a gas quantity change the sensor shows a small pressure artifact of less than 15 Pa, and at constant change rates the pressure artifact is smaller than 10 Pa or 0.01% of ambient pressure.
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Affiliation(s)
- Joris J J Dirckx
- Laboratory of Biomedical Physics, University of Antwerp, Groenenborgerlaan 171, Antwerp, Flanders B-2020, Belgium
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