Wyniki wyszukiwania - BazTech

1

Sieć sensoryczna do pomiaru wielkości biomedycznych człowieka

Nogły Rafał, Wnuk Marian

Elektronika : konstrukcje, technologie, zastosowania

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2022

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Vol. 63, Nr 2

13--17

PL

W artykule przedstawiono wybrane parametry życiowe człowieka wraz z urządzeniami umożliwiającymi ich pomiar. Następnie przedstawiono systemy przesyłania informacji wokół systemu badania parametrów życiowych człowieka. Zwrócono uwagę na potrzebę zastosowania wielu technologii w celu zapewnienia kompatybilności na wielu poziomach. W dalszej części przedstawione zostały przykładowe anteny które znajdą zastosowanie wokół sieci sensorycznej, po czym został przedstawiony projekt anteny tekstylnej mogącej zostać użytej na poziomie sensor-centrala wraz z charakterystykami opisującymi jej parametry.

EN

The paper presents selected human vital parameters along with devices that enable their measurement. Then, the information transmission systems around the human vital parameters study system are discussed. The need for multiple technologies to ensure compatibility at multiple levels has been highlighted. Further on, examples of antennas that will be used around the sensory network are presented, and then a design of a textile antenna that can be used at the sensor-control panel level was presented, along with the characteristics describing its parameters.

2

Effects of stenosis and dilatation on flow of blood mixed with suspended nanoparticles: a study using homotopy technique

Sudha T., Umadevi C., Dhange M., Manna S., Misra J. C.

International Journal of Applied Mechanics and Engineering

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2021

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Vol. 26, no. 1

251--265

EN

The paper deals with a theoretical study on blood flow in a stenosed segment of an artery, when blood is mixed with nano-particles. Blood is treated here as a couple stress fluid. Stenosis is known to impede blood flow and to be the cause of different cardiac diseases. Since the arterial wall is weakened due to arterial stenosis, it may lead to dilatation /aneurysm. The homotopy perturbation technique is employed to determine the solution to the problem for the case of mild stenosis. Analytical expressions for velocity, shear stress at the wall, pressure drop, and flow resistance are derived. The impact of different physical constants on the wall shear stress and impedance of the fluid is examined by numerical simulation. Streamline patterns of the nanofluid are investigated for different situations.

3

Wybór metod pomiarowych dla diagnostyki sztucznego serca

Konieczny G., Opilski Z., Pustelny T., Maciak E., Gibiński P., Gacek A., Kustosz R.

Prace Naukowe Politechniki Śląskiej. Elektryka

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2009

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z. 4

77-84

PL

W niniejszym artykule zamieszczono analizę metod pomiarowych, możliwych do zastosowania w protezach sztucznego serca POLVAD (Polish Ventricular Assistant Device). Mechaniczne protezy służące do wspomagania serca rozwijane w Fundacji Rozwoju Kardiochirurgii w Zabrzu mają za zadanie wspomagać leczenie mięśnia sercowego u pacjentów ze zdiagnozowanymi chorobami serca i układu krwionośnego. Zastosowanie protezy wspomagającej pracę serca pozwala na znaczne przyspieszenie leczenia. Artykuł opisuje zagadnienia związane z wyborem bezinwazyjnej metody pomiarowej pozwalające na określenie ciśnienia krwi w określonych miejscach protezy sztucznego serca. Warunkiem koniecznym, jaki musi spełnić układ pomiarowy, jest całkowita separacja czujnika od środowiska krwistego. Wynika to z potrzeby unikania destrukcji składników krwi oraz powstawania zakrzepów. W pracy opisano dwie możliwe metody pomiarowe - systemy zbudowane przy wykorzystaniu folii piezoelektrycznej oraz metod optycznych.

EN

Methods for pressure measurement to be used in the POLVAD artificial heart prostheses are described in this paper. The mechanical prostheses used for heart support are developed by the Foundation of Cardiac Surgery Development in Zabrze. Their main purpose is to aid the heart muscle recovery of patients with cardiac problems. Use of the POLVAD prosthesis speeds up the healing process. The paper covers the recent research into the possible pressure sensing methods for use in the noninvasive blood pressure measurement in required places around the prosthesis. The main requirement for the developed methods is lack of contact with blood to avoid the destruction of blood elements and minimise influence on the blood flow. Two sensing methods are presented: one based on a fiber pressure sensor, the other on piezoelectric pressure measurements. The preliminary results are included, and choice of the best method for future development is pointed out.

4

Metody wyznaczania krzywej oscylometrycznej

Wilk B.

Zeszyty Naukowe Politechniki Rzeszowskiej. Elektrotechnika

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2005

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z. 28 [223]

267-274

PL

W pracy zaprezentowano i porównano kilka metod do wyznaczania obwiedni amplitudowej sygnału reprezentującego oscylacje ciśnienia mankiecie okluzyjnym podczas deflacji. Wykazano, ze proponowana metoda bazująca na interpolacji wielomianem umożliwia wyznaczenie obwiedni badanego sygnału z dużą dokładnością, co w znacznym stopniu wpływa na końcowy wynik pomiaru.

EN

This paper deals with some problems of digital signal processing occurring during arterial blood pressure measurement using the oscillometric method. The amplitude envelope of pressure oscillations was estimated by various methods (i.e. the average energy or the average amplitude, and the Hilbert transform). The polynomial interpolalion was proposed for creating the oscillometric curve. The results suggested that this method was superior in estimating the signal envelope.

5

Numerical simulation of pulsating blood flow through stenosed vessel

Kohge K., Minemura K.

International Journal of Applied Mechanics and Engineering

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2003

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Vol. 8, no spec.

155-161

EN

In connection with blood flow in stenosed blood vessels, Ojha and his co-workers have been measured pulsating flows in rigged pipes with a contraction using kerosene. The experiment, however, leaves something to be desired, for example, the pressure fluctuation relevant to the pulsating flow velocity is entirely unknown. To make clear the mechanism of the pulsating flow in the stenosed pipes, the flow is numerically simulated, in this paper, using a finite difference method with CIP scheme. Obtained axial velocity distributions and thickness of separation region are confirmed with Ojha's experimental results. Resultant flow brings about large periodical change of wall stress in the downstream and of pressure at the contraction, respectively, suggesting that the flow behaviour relates closely with arterial diseases.

6

Blood pressure in children and adolescents - some aspects of measurements interpretation

Nawarycz T., Kolibabka M., Ostrowska-Nawarycz L.

Journal of Medical Informatics & Technologies

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2002

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Vol. 4

SN3--7

EN

This work presents new possibilities for interpreting blood pressure measurements of children and adolescents with the use of Internet. A dynamic web site allows for such interpreting and archiving blood pressure measurements in developmental age. Stored measurements results can become a basis for national pressure norm considering specificity of development of Polish children and adolescents. The interpretation system of blood pressure measurements in developmental age can be used both at school and home

7

Experimental parameter investigation for development of a control system for assessment of cardiovascular response to stress in student airline pilots

Avolio A., Kong L., Middleton J., Quasem A., Frangakis G.

Image Processing & Communications

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2002

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Vol. 8, no 2

121-127

EN

This study describes an experimental investigation where cardiovascular response was measured for a range of stimuli. The aim was to obtain relationships between stimuli and physiological variables that could be implemented in a general control system where the appropriate stimulus is selected for a desired test. Reaction time (Tr), blood pressure (BP) and heart rate (HR) were measured in 14 first-year aviation students (10 males, 4 females, age 19-23 years) during different types of computer-based tests : visual, auditory, mathematical. For all test responses across all subjects mean BP increased in 95%, HR increased in 66%. Both BP and HR increased concomitantly in 61% of responses. Average Tr was 583msec (visual), 477msec (auditory) and 10.3 sec (math). There was also a positive relation between BP, HR and Tr. A difference in these parameters was also seen between males and females. Findings of this study show that response to stress results in increased BP but not HR for all subjects studied. This indicates that short-term regulatory mechanisms of BP and HR are manifest only in some subjects some of the time for similar stimuli. These results can be used to implement an assessment procedures and test response criteria in an automated system for testing young student pilots.

8

Measurement of tissue pressure with symptoms of compartment syndrome

Živéak J., Šimšik D.

Acta of Bioengineering and Biomechanics

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2002

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Vol. 4, nr 2

101-104

EN

The increase in the tissue pressure (TP) in the compartment can be due to the internal pressure (contusion, swelling, inflammation), or due to the external pressure (tight bandage, pneumatic splint). Injury and a deep thrombosis of a blood vessel lead to the stasis and subsequently to the lowering of arterial-venous gradient just the same as this associated with lowering of arterial medium pressure due to the shock with the excessive positioning of the extremity. Our aim was to establish the value of TP and thus to prevent the symptoms of the compartment syndrome. Tte above-mentioned problem can be solved by measuring the tissue pressure in a real time, where the approximation of an invasive and a non-invasive pressure is proved by a comparative measurement.

9

Computational modelling of stress and strain states in artery walls using FEM

Bursa J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2000

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z. 12

101-106

EN

Computational modelling of stress and strain states in artery walls is realized on an example of aorta, modelled as a cylindric body, consisting of one or two homogeneous coaxial layers with constant thickness, and showing finite distortions under physiologic load. The material of each layer is modelled as an isotropic non-linear elastic continuum with a negligible compressibility. The model solved using finite element method is loaded, in addition to the blood pressure, by axial prestretch according to conditions in a human body, and includes residual stresses, as well.

PL

Komputerowe modelowanie stanów odkształcenia i odkształcenia w ściankach arterii pokazano na przykładzie aorty, zamodelowanej jako walec składający się z jednej lub dwóch jednorodnych, współosiowych warstw o stałej grubości i wykazujących niewielkie zaburzenie pod wpływem obciążenia fizjologicznego. Materiał każdej warstwy zamodelowano jako nieliniowe, izotropowe continuum o pomijalnej ściśliwości. Model rozwiązano wykorzystując metodę elementów skończonych przy obciążeniu ciśnieniem krwi i promieniowymi napięciami wynikającymi z budowy ciała ludzkiego. Uwzględniono również naprężenia resztkowe.