Národní úložiště šedé literatury Nalezeno 9 záznamů.  Hledání trvalo 0.00 vteřin. 
Realistic simulation of the pulse wave in the vessel in vitro
Leitermann, D. ; Chlup, Hynek ; Pražák, Josef ; Konvičková, S.
The paper points out the 3rd generation of the experimental set-up simulating the Cvs. New heart generator is used, systemic resistance adapter is described and the way of modeling of more realistic external envinroment of aorta is discused.
Modelová aproximace odporu v srdečně cévním systému
Musil, Jan ; Chlup, Hynek ; Leitermann, D. ; Pražák, Josef
Aproximace sytémového odporu byla vytvořena odporovou skříní s celkem 24 kanály prověkové skupiny od 20 do 100let věku a to v vztahu ke klidové a zátěžové tepové frekvenci. Systém byl vypracován heuristicky a bude ověřen na fyzikálním modelu a výsledky srovnány s klinickými měřeními.
Testování podpory srdečního selhání
Musil, Jan ; Leitermann, D.
Vliv rotačního čerpadla zapojeného na levou srdeční komoru byl studován na testovací mechanické lince při zapojení i pravého srdce do serie se srdcem levým. Výpočty byly zaměřeny na hodnoty tlaku a odporu při použití rotačního čerpadla. Výsledky se podstatně lišily od měření v okruhu s jedním pulzním čerpadlem a podporou rotačním čerpadlem
Modulus of elasticity of vessel determined by pulse wave velocity measurement- criterion for non-invasive assessment of pathology
Leitermann, D. ; Pražák, Josef ; Poušek, L. ; Musil, Jan ; Konvičková, S.
The knowledge of material properties of vessel are the useful contribution for the description of development and progress of artery diseases. The expression of looked for conclusions is always conditioned by the obtaining of diagnostic data, which are the only information for the assessment of teh artery pathology. The motivation of this study has been to develop non-invasive method for the diagnostics of teh pathological vessels.
Pulsatory flow under rotary pump used to failing heart support
Musil, Jan ; Převorovská, Světlana ; Leitermann, D. ; Pražák, Josef ; Maršík, František
The hydrodynamic resistance values increase in the mock-line circuit verified in some cases the concommitant phenomenon due to the continuous supporting device, i. e. complete destruction of the pulsatory wave form into the chaotic turbulent flow thro the supported system.
Realistic model of the resistance of systemic blodd circuit
Leitermann, D. ; Pražák, Josef ; Musil, Jan
The next model of systemic resistance was suggested in accordance with the two preconditions. The first one was the ratio of aorta´s and capillaries´ cross-sectional area, i.e. the capillary´s one being larger than the aorta´s one, which fact would be ough for our study.
Circuit resistance modeling in failing heart rotary pump support
Musil, Jan ; Pražák, Josef ; Leitermann, D.
The stepwise resistance increase caused by the throttle valve usage in the mock-line circuit comprising the pulsating ventricle in failing heart modus and supported by rotary pump set up in parallel was studied. It appears thus important to regulate support system producing a continuous type of flow to such a regime not allowing the pulsating flow of the failing heart to disappear and preventing the mean systemic pressure value before substantial increase.
Systemic compliance effect un failing heart support (mechanical model study)
Musil, Jan ; Pražák, Josef ; Leitermann, David
The systemic compliance changes during singel rotary pump support on a symplified circuit were studied. Thus rotation speed of the supporting rotary pump, frequency rate of the failing ventricle under the changing conditions of compliance of the systemic branch (aortic root) were invesigated. The systemic compliance effect enhances the common flow of the rotary pump and the pulsating supported ventricle.
Model of insufficient heart supported by rotary pump (Mechanical study)
Pražák, Josef ; Musil, Jan ; Leitermann, D.
The insufficient heart may be supported by rotary pump connected to the left heart in parallel. Behaviour of a heart can be characterized by Frank-Starling's curve, i.e. the cardiac output is function of only the heart rate. Values of cardiac output of insufficient heart are lower than the ones of healthy heart. The task of rotary pump is to transform the cardiac output to higher values. This transformation has to respect minimum value of ejection fraction.

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