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    Implantable centrifugal blood pump with hybrid magnetic bearings
    4.
    发明授权
    Implantable centrifugal blood pump with hybrid magnetic bearings 有权
    具有混合磁轴承的植入式离心血泵

    公开(公告)号：US07462019B1

    公开(公告)日：2008-12-09

    申请号：US09673922

    申请日：1999-04-22

    申请人： Paul E. Allarie ,  Gill B. Bearnson ,  Ron Flack ,  Pratap S. Khanwilkar ,  B. Ajit Kumar ,  James W. Long, Jr. ,  Don B. Olsen ,  Jeffrey Decker ,  Michael Baloh

    发明人： Paul E. Allarie ,  Gill B. Bearnson ,  Ron Flack ,  Pratap S. Khanwilkar ,  B. Ajit Kumar ,  James W. Long, Jr. ,  Don B. Olsen ,  Jeffrey Decker ,  Michael Baloh

    IPC分类号： F04B17/03 ,  A61M1/10

    CPC分类号： A61M1/101 ,  A61M1/1012 ,  A61M1/1015 ,  A61M1/1031 ,  A61M1/12 ,  A61M1/122 ,  F04D13/0666 ,  F04D29/048 ,  F05B2200/23 ,  F16C32/0448 ,  F16C2316/18 ,  F16C2360/44

    摘要： A pump for pumping sensitive fluids, such as blood, having no mechanical contact between the impeller and any other structure. The pump comprises a pump housing, an impeller disposed within the pump housing, a magnetic bearing system for supporting and stabilizing the impeller in five degrees of freedom, and a conformally shaped magnetically linked motor for rotating the impeller. The magnetic bearing system and motor advantageously comprise electromagnets and permanent magnets for stability and control of the impeller, and to reduce size, weight, and pump power consumption. Permanent and electromagnets are disposed on the pump housing and permanent magnets are disposed on the impeller such that by controlling electric current through the electromagnets on the housing, the magnetically suspended impeller functions as the rotor, and the housing as the stator of a D.C. motor. The system advantageously allows for sensing of relative impeller position and dynamic properties without the need for additional sensors. The fluid inlet, pump impeller, housing, and other components are configured such that flow patterns are as smooth and laminar as possible to reduce damage to the fluid, and such that eddies, flow separation, and re-circulation are reduced. In various embodiments, the pump is suitable for short or long-term implantation as a ventricular assist device or as a complete replacement heart in a human patient.

    摘要翻译： 用于泵送诸如血液的敏感流体的泵，其在叶轮和任何其它结构之间没有机械接触。 泵包括泵壳体，设置在泵壳体内的叶轮，用于以五个自由度支撑和稳定叶轮的磁轴承系统，以及用于旋转叶轮的共形形状的磁连接马达。 磁轴承系统和电动机有利地包括用于叶轮的稳定和控制的电磁体和永磁体，并且减小尺寸，重量和泵的功率消耗。 永久和电磁铁设置在泵壳体上，并且永久磁铁设置在叶轮上，使得通过控制通过壳体上的电磁体的电流，磁悬浮叶轮用作转子，并且壳体用作直流电动机的定子。 该系统有利地允许感测相对叶轮位置和动态特性，而不需要额外的传感器。 流体入口，泵叶轮，壳体和其它部件被构造成使得流动模式尽可能平滑和层流以减少对流体的损害，并且减小涡流，流动分离和再循环。 在各种实施例中，泵适合于作为心室辅助装置的短期或长期植入或者作为人类患者中的完全置换心脏。

    Method and system for positioning a movable body in a magnetic bearing system
    5.
    发明授权
    Method and system for positioning a movable body in a magnetic bearing system 有权
    将移动体定位在磁性轴承系统中的方法和系统

    公开(公告)号：US06879126B2

    公开(公告)日：2005-04-12

    申请号：US09895881

    申请日：2001-06-29

    申请人： Brad E. Paden ,  Jed C. Ludlow ,  Gill B. Bearnson

    发明人： Brad E. Paden ,  Jed C. Ludlow ,  Gill B. Bearnson

    IPC分类号： F16C39/06 ,  H02K7/09 ,  G05B11/42

    CPC分类号： F16C32/0442 ,  F16C32/0446 ,  F16C32/0476 ,  H02K7/09

    摘要： A magnetic bearing system allows a movable body to be positioned to a point of substantial equilibrium in an axial direction after a system shutdown. A sensor measures the axial position of the movable body to produce an displacement output. That output is then adjusted to account for a sensor offset. The adjustment is stored and can be used to position the movable body during regular operation of the system or when the system reboots or restarts. The adjusted displacement output is converted into a force for positioning the movable body. The movable body may be a rotor in a heart pump apparatus.

    摘要翻译： 磁性轴承系统允许可移动体在系统关闭之后被定位在轴向上基本上平衡的点上。 传感器测量可移动体的轴向位置以产生位移输出。 然后调整该输出以考虑传感器偏移。 调整被存储并且可以用于在系统的常规操作期间或当系统重新启动或重新启动时定位移动体。 调整后的位移输出被转换成用于定位移动体的力。 可移动体可以是心脏泵装置中的转子。