초록 ▼

An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housi

An apparatus and method for a centrifugal fluid pump for pumping sensitive biological fluids, which includes (i) an integral impeller and rotor which is entirely supported by an integral combination of permanent magnets and electromagnetic bearings and rotated by an integral motor, (ii) a pump housing and arcuate passages for fluid flow and containment, (iii) a brushless driving motor embedded and integral with the pump housing, (iv) a power supply, and (v) specific electronic sensing of impeller position, velocity or acceleration using a self-sensing method and physiological control algorithm for motor speed and pump performance based upon input from the electromagnetic bearing currents and motor back emf--all fitly joined together to provide efficient, durable and low maintenance pump operation. A specially designed impeller and pump housing provide the mechanism for transport and delivery of fluid through the pump to a pump output port with reduced fluid turbulence.

대표청구항 ▼

[ We claim:] [1.] Apparatus for pumping sensitive biological fluids comprising:a construct having an exterior, a hollow interior having walls therein, at least one housing permanent magnet disposed therein, and an axial center;an inlet formed from the construct exterior for passage of fluids thereth

[ We claim:] [1.] Apparatus for pumping sensitive biological fluids comprising:a construct having an exterior, a hollow interior having walls therein, at least one housing permanent magnet disposed therein, and an axial center;an inlet formed from the construct exterior for passage of fluids therethrough and into the hollow interior of the construct;an outlet formed from the construct exterior for passage of fluids therethrough from the hollow interior of the construct, the outlet radially located from the axial center of the construct;an impeller means disposed within the hollow interior of the construct and out of contact therewith for controlling fluid flow into the inlet, through the hollow interior of the construct, and out of the outlet, the impeller means having arcuate blades and arcuate passageways whereby fluid flow through the construct is gradually redirected from the inlet to the outlet;a magnetic means comprising a plurality of electromagnetic actuators which provide six axes of control, including (i) one axial translational axis, (ii) two radial translational axes, and (iii) three rotational axes comprising two axes controlled for moment and one axis controlled by motor rotation, wherein at least one of the five axes controlled for moment, axial translation, and radial translation is controlled by a set of permanent magnets in the housing magnetized in an axis parallel to the axis of rotation of the impeller means, and further including at least one impeller permanent magnet juxtaposed to the housing permanent magnet for suspending the impeller means out of contact with the hollow interior of the construct; anda motor means for selectively rotating the impeller means to thereby control fluid flowing through the apparatus.