摘要:
A rotary blood pump may include one or more motor stators overlying exterior surfaces of a wall defining a pumping chamber. A rotatable impeller within the pumping chamber may have a hydrodynamic thrust bearing surface adapted to constrain a position of the impeller along an axis of rotation relative to the wall when the impeller is rotating about the axis of rotation. The impeller position may then be constrained without requiring a constant polarity magnetic force to be applied in the axial direction from a fixed position of the housing.
摘要:
A tool for coring a hole in a portion of a patient's body. A cylindrical sheath includes a hollow bore open at both ends. A shaft is axially movable back and forth within the bore. A blade assembly is attached to one end of the shaft. The blade assembly comprises a hollow open cup portion having a closed end and a cutting edge formed around the margin of the open end. An interface is attached to the sheath which is shaped and dimensioned to communicate with a connector used to connect a medical device to a patient's body.