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AssigneeCardiometrics, Inc.
InventorsWayne C. Haase, Jerome Segal, Paul D. Corl, Jeffrey J. Christian, Ronald G. Williams
Estimating the term…
System for measuring a characteristic of flow of liquid in a vessel of a patient comprising a transducer positioned in a vessel in a patient for supplying ultrasonic energy. The transducer produces a substantially uniform beam which encompasses the vessel. The transducer receives ultrasonic energy back scattered from the red blood cells and provides an electrical output signal. A first moment detector is provided which receives the electrical output from the transducer and provides a first moment signal. Normalization is provided to the output of the first moment detector to provide an electrical output representing a characteristic of the flow of the liquid in the vessel.
In a device for use in measuring a characteristic of liquid flow in a vessel, a flexible elongate tubular member having proximal and distal extremities having an exterior diameter of 0.018 inches or less, a coil spring carried by the distal extremity of the flexible elongate tubular member and having an exterior diameter of 0.018 inches or less, the coil spring having a distal extremity, a transducer carried by the distal extremity of the coil spring and having an exterior diameter of 0.018 inches or less, conductive means connected to the transducer and extending interiorly of the coil spring and of the flexible elongated tubular member and protective means carried by the coil spring and engaging the elongated tubular member and serving to prevent liquid in the vessel from coming into contact with the conductive means extending through the coil spring and the flexible elongate tubular member.
In a guide wire for use in measuring a characteristic of liquid flow in a vessel, a flexible elongate tubular element having proximal and distal extremities, a core wire extending through at least a portion of the flexible elongate tubular element and having a tapered distal extremity extending beyond the distal extremity of the tubular element, a coil extending over and beyond the distal extremity of the core wire, the coil having a proximal extremity and a distal extremity, means securing the proximal extremity of the coil to the distal extremity of the tubular element, transducer means secured to the distal extremity of the coil, first and second conductor means carried by the tubular element and connected to the transducer and extending to the proximal extremity of the tubular element, means bonding the tubular element and the coil to the core wire so that torsional forces applied to the tubular element are supplied to the coil and protective means associated with the coil and the tubular element for preventing liquid in the vessel from coming into contact with the first and second conductor means extending through the coil and the tubular element.
Dependencies are inferred from the claim text.