Abstract:
The invention relates to a rotary pump, comprising a rotor (1, 1', 1") having delivery elements (3, 3', 3", 4, 4', 4") which deliver at least a portion of a fluid in the axial direction of the rotor. Two delivery elements or groups of delivery elements are provided on the rotor for delivering the fluid and deliver the fluid to be delivered in mutually opposing axial directions of the rotor, so that the axial thrust components substantially compensate each other. The fluid flows flowing counter to each other jointly give way in the radial direction of the rotor and can be jointly discharged through the volute casing (9) and utilized.
Abstract:
The invention relates to a rotational pump capable of running at a rotational speed (n) having a system for direct or indirect measurement of pressure difference or flow rate across the pump, wherein a control system is designed to calculate an index of pulsatility (PI) of the pressure difference or flow rate, estimating the gradient of PI with respect to the rotational speed (dPl/dn) and regulating the dPI/dn to a pre-defined set-point or regulating the pump in a way that the dPI/dn is minimal.
Abstract:
The claimed subject-matter relates to a blood pump (1), comprising a hollow body (2), in which an impeller (3) with a blading (4) is provided for producing an axial propulsion of the blood along the impeller (3), as well as an at least partly actively stabilised magnetic bearing device (15, 15', 16, 16', 17, 17', 18, 18'), wherein the impeller may be set into a rotation about a rotation axis (R) of the impeller (3), with a motor stator (19), and wherein the hollow body (2) comprises an inlet (5) for the flow of blood into the hollow body (2) in an inflow direction (E) which is essentially parallel to the rotation axis (R), and an outlet (6) for the outflow of the blood out of the hollow body (2) in an outflow direction (A).
Abstract:
The invention relates to a rotational pump capable of running at a rotational speed (n) having a system for direct or indirect measurement of pressure difference or flow rate across the pump, wherein a control system is designed to calculate an index of pulsatility (PI) of the pressure difference or flow rate, estimating the gradient of PI with respect to the rotational speed (dPl/dn) and regulating the dPI/dn to a pre-defined set-point or regulating the pump in a way that the dPI/dn is minimal.
Abstract:
A method and a device for the measurement of fluid-mechanically effective parameters of a fluid, with a fluid pump which comprises a delivery element (2) which is mounted in a magnet bearing (10, 10a, 11, 1 Ia), according to the invention, envisages the delivery element (2) of the fluid pump being excited into an oscillation by way of an excitation device (16, 44), wherein the oscillation parameters as well as, as the case may be, the oscillation behaviour is measured, and parameters of the fluid are determined from this.
Abstract:
The invention relates to a blood pump (1) comprising a hollow body (2), in which an impeller (3) with a blading (4) is provided for producing an axial propulsion of the blood along the impeller (3), as well as an at least partly actively stabilised magnetic bearing device (15, 15', 16, 16', 17, 17", 18, 18') and a hydrodynamic bearing device (7) for the impeller, wherein the impeller may be set into a rotation about a rotation axis (R) of the impeller (3) with a motor stator (19) located outside the hollow body, and wherein the hollow body (2) comprises an inlet (5) for the flow of blood into the hollow body (2) in an inflow direction (E) which is essentially parallel to the rotation axis (R), and an outlet (6) for the outflow of the blood out of the hollow body (2) in an outflow direction (A), wherein the outlet (6) is arranged offset to the rotation axis (R) of the impeller (3) for producing an outflow angle (α) between the inflow direction (E) and the outflow direction (A), said angle being different from zero, and that the blading is designed as a spiral. The invention further relates to a total artificial heart comprising two blood pumps of the type suggested here.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur axialen Förderung von Körperflüssigkeiten. Der Erfindung liegt die Aufgabe zu Grunde, den Zuströmbereich und den Abströmbereich einer Axialpumpe so auszubilden, dass auch bei einer in diesen Bereichen vorzusehenden Umlenkung der Strömung keine Strömungsablösung erfolgt, sondern ein weitgehend ungestörtes Strömungsprofil erhalten bleibt.
Abstract:
The invention relates to a method for controlling an assist pump for fluid delivery systems with pulsatile pressure. If, for example, a heart-assist pump is operated with a constant rotational speed, the blood is continually delivered through the assist pump even when the cardiac chamber is in the decontraction phase. The inventive method ensures that an assist pump functions in an assisting manner only during the pressure phase of the main pump by constantly determining the pressure difference between the inlet and delivery side of the assist pump and by constantly determining the rate of flow through the assist pump. The rotational speed of the assist pump is controlled as to prevent the determined pressure difference from falling below a predeterminable value and to prevent the rate of flow from falling below zero.
Abstract:
Die Erfindung bezieht sich auf einen hartmagnetischen Gegenstand und ein Verfahren zur Einstellung eines Magnetvektors eines hartmagnetischen Gegenstandes.Der Erfindung liegt daher die Aufgabe zugrunde, einen hartmagnetischen Gegenstand und ein Verfahren zu dessen Herstellung anzugeben, welcher ohne Beeinflussung durch einen äusseren Magnetkreis einen gewünschten resultierenden magnetischen Vektor aufweist, der sich im Rahmen eines vorgegebenen Toleranzbereiches bewegt, und darüber hinaus der hartmagnetische Gegenstand eine gegenüber dem Stand der Technik höhere maximale Energiedichte besitzen soll.Erfindungsgemäss besteht ein hartmagnetischer Gegenstand, dessen magnetischer Vektor sich im offenen Magnetkreis weitgehend im Rahmen eines vorgegebenen Toleranzbereiches bewegt, aus mindestens einem hartmagnetischen Formteil (1) und mindestens einem weiteren Formelement (11), die so miteinander kombiniert sind, dass durch Formgebung, Zusammenführung und Ausrichtung des Formteiles (1) und des Formelementes (11) eine vorgegebene Richtung und Lage des Magnetvektors des hartmagnetischen Gegenstandes erreicht wird. Der Magnetvektor des hartmagnetischen Gegenstandes ist der resultierende Magnetvektor der Magnetvektoren (4, 14) des hartmagnetischen Formteiles (1) und der Formelemente (11).
Abstract:
Vorrichtung zur axialen Förderung von Flüssigkeiten, deren Förderteil vollständig magnetisch gelagert ist und dessen radiale Lagerung eine hinreichende Steifigkeit und eine wirkungsvolle Dämpfung aufweist, so dass Probleme beim Durchfahren kritischer Drehzahlen sowie nachteilige Auswirkungen hydrodynamischer und mechanischer Unwuchten des Rotors vermieden werden können. Dazu ist die magnetische Lagerung mit einer hydrodynamischen Lagerung kombiniert.