摘要:
Es wird elektromagnetischer Drehantrieb vorgeschlagen, mit einem Rotor (2), welcher berührungslos magnetisch antreibbar ist und spulenfrei ausgestaltet ist, sowie mit einem Stator (3), welcher als Lagerund Antriebsstator ausgestaltet ist, mit welchem der Rotor (2) im Betriebszustand berührungslos magnetisch um eine Solldrehachse (A) antreibar und bezüglich des Stators (3) berührungslos magnetisch lagerbar ist, wobei der Stator (3) einen oberen Statorteil (31) mit einer Mehrzahl von ausgeprägten oberen Polen (310) zum Tragen von oberen Wicklungen umfasst, sowie einen unteren Statorteil (32) mit einer Mehrzahl von ausgeprägten unteren Polen (320) zum Tragen von unteren Wicklungen, wobei der obere Statorteil (31) und der untere Statorteil (32) bezüglich der axialen Richtung beabstandet zueinander angeordnet sind und wobei zwischen dem oberen Statorteil (31) und dem unteren Statorteil (32) ein Permanentmagnet (33) vorgesehen ist.
摘要:
Die Erfindung bezieht sich auf eine Herzpumpe (6) mit einem Förderkanal und mit einer in diesem angeordneten Fördereinrichtung (6b, 6c, 34) für Blut, wobei der Förderkanal wenigstens teilweise in einem Pumpenrohr (6a, 105a) verläuft. An der Herzpumpe, insbesondere an eine Wand des Förderkanals, insbesondere am Pumpenrohr, ist eine erste Sensoreinrichtung (100, 101, 102) zur Messung der Sauerstoffsättigung des Blutes vorgesehen. Auch eine Steuereinrichtung kann mit in die Pumpe integriert sein. Es ergeben sich hierdurch zusätzliche Überwachungs- und Steuerungsmöglichkeiten.
摘要:
A centrifugal pump system having an impeller rotating with first and second magnetic structures on opposite surfaces. A levitation magnetic structure is disposed at a first end of a pump housing having a levitating magnetic field for axially attracting the first magnetic structure. A multiphase magnetic stator at a second end of the pump housing generates a rotating magnetic field for axially and rotationally attracting the second magnetic structure. A commutator circuit provides a plurality of phase voltages to the stator. A sensing circuit determines respective phase currents. A controller calculates successive commanded values for the phase voltages in response to the determined phase currents and a variable commutation angle. The angle is selected to correspond to an axial attractive force of the stator that maintains a levitation of the impeller at a centered position within the pumping chamber.
摘要:
The present invention relates to a rotary blood pump with a double pivot contact bearing system with an operating range between about 50 mL/min and about 1500 mL/min, wherein the force on the upper bearing is less than 3N during operating speeds up to 6000 rpm. The rotary blood pump is part of a blood pump system that includes blood conduit(s), a control system with optional sensors, and a power source. Embodiments of the present invention may include elements designed to increase the length of time the rotary blood system can operate effectively in vivo, including wear resistant bearing materials, a rotor back plate for magnetic attraction of the rotor to reduce bearing pivot bearing forces and wear, a rotor size and shape and a bearing gap that combine to create a hydrodynamic bearing effect and reduce bearing pivot bearing forces and wear, improved intravascular conduits with increased resistance to thrombosis, conduit insertion site cuffs to resist infection, and conduit side ports amenable to the easy insertion of guidewire and catheter-based medical devices to treat conduits and related blood vessels to maintain blood pump system function over time. The pump system is configured to connect to the vascular system in a patient and pump blood at a desired rate. The invention also relates to a method of using a blood pump system for persistently increasing the overall diameter and lumen diameter of peripheral veins and arteries by persistently increasing the velocity of blood and the wall shear stress in a peripheral vein or artery for period of time sufficient to result in a persistent increase in the overall diameter and lumen diameter of the vessel is provided. For blood pump systems intended for use to increase the overall diameter and lumen diameter of a blood vessel, the pumping of blood is monitored and adjusted, as necessary, to maintain the desired elevated blood velocity and wall shear stress, and the desired pulsatility in the target blood vessel in order to optimize the rate and extent of the persistent increase in the overall diameter and lumen diameter of the target blood vessel. The blood pump system may also be used to reduce venous hypertension in a lower extremity and increasing the rate of healing of lower extremity venous ulcers in patients is provided. For blood pump systems intended for use to treat venous hypertension of an extremity, the pumping of blood is monitored and adjusted, as necessary, to maintain the desired venous blood pressure in the treated extremity.
摘要:
A centrifugal pump system having an impeller rotating with first and second magnetic structures on opposite surfaces. A levitation magnetic structure is disposed at a ftrst end of a pump housing having a levitating magnetic field for axially attracting the first magnetic structure. A multiphase magnetic stator at a second end of the pump housing generates a rotating magnetic field for axially and rotationally attracting the second magnetic structure. A commutator circuit provides a plurality of phase voltages to the stator. A sensing circuit determines respective phase currents. A controller calculates successive commanded values for the phase voltages in response to the determined phase currents and a variable commutation angle. The angle is selected to correspond to an axial attractive force of the stator that maintains a levitation of the impeller at a centered position within the pumping chamber.
摘要:
A system and a method for starting a rotor of an implantable blood pump are described. For example, a blood pump system includes a rotary motor having a stator and a rotor. The rotor has permanent magnetic poles for magnetic levitation of the rotor, and the stator has a plurality of pole pieces arranged circumferentially at intervals. The blood pump system includes a controller configured to control a start phase of the rotor, wherein the start phase is prior to the rotor being positioned in a predefined geometric volume for pumping blood and wherein the start phase includes performing a rotation of the rotor by an angle larger than an angle corresponding to a quarter of an angular distance between two neighboring magnetic poles of the rotor.