Wyniki wyszukiwania - BazTech

1

Identification of the human respiratory system during experiment with negative pressure impulse excitation

Gajda J., Piwowar P.

Metrology and Measurement Systems

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2009

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Vol. 16, nr 4

569-582

EN

This article describes an innovative measurement method enabling one to identify mechanical parameters of the respiratory tract. The method is compared with traditional techniques such as the forced oscillation technique (FOT), forced expiration technique, and the interrupter technique (IT). The developed characteristics of the method were examined by simulation and experiments. The results confirmed its specificity and sensitivity.

2

Suitability of new methods for pulseoximetric data analysis in screening diagnostics of Respiratory Disorders During Sleep (RDDS)

Hatliński G. J., Kowalski J. K., Kukwa A.

Biocybernetics and Biomedical Engineering

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2008

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Vol. 28, no. 3

27-33

EN

Pulseoximetry is the simplest and the most reliable screening test for diagnosing of Respiratory Disorders During Sleep. Assessment of blood saturation with oxygen is a basic parameter to determine the degree of SAS (Sleep Apnea Syndrome) progression. The authors describe the conventional, but also their own newly developed methods for pulseoximetric data analysis, tested for over 4500 patients. The purpose of these new methods is to give physicians easier and more simple means for evaluating patients after all-night blood oxygen saturation monitoring. Inventiveness of this method lies in the possibility of examining of dynamics of blood oxygen saturation during patient's sleep. All received data are stored and can be reported in special 1-hour step intervals to facilitate comparative analysis of subsequent examinations and assess effectiveness of the treatment.

3

Noninvasive tonometry of intraocular pressure over a closed eyelid

Nakai M., Yoshizawa I., Fujita A., Takeda S., Yanasima K., Uchiyama A., Yanagisawa M.

Biocybernetics and Biomedical Engineering

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2007

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Vol. 27, no. 1-2

199-205

EN

For more than 40 years, methods to measure intraocular pressure over a closed eyelid have been studied but without much success. The eyelid thickness varies among individuals, and this has been a major obstacle. This report presents our findings that vibrating the eyeball with an activator evokes a response depending on ocular pressure changes. The eyeball is vibrated with a ceramic transducer over the closed eyelid, and the value of the current flowing through the transducer is measured. The acoustic load of the transducer varies when it comes in contact with the object in which the internal pressure changes. As a result, the electrical impedance, in turn, varies in response to this load. Consequently, the current varies when an alternating voltage is applied to the transducer. Thus, intraocular pressure is converted from current value. A device based on this phenomenon was developed. It measures intraocular pressure within seconds, after being placed on the closed eyelid, and its weight is less than 55 g. The device was tested on 10 human eyes. The correlation coefficient in between our tonometer and the model routinely used in clinical use was about 0.93. Therefore, the new method is sufficiently accurate for clinical application.