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AssigneeCardiometrics, Inc.
InventorsJeffrey J. Christian, Paul D. Corl, Jerome Segal, Ronald G. Williams, Wayne C. Haase
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 inform 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 element having proximal and distal extremities and having a wall defining a passage extending therethrough, a coil spring carried by the distal extremity of the flexible elongate tubular element, the coil spring having a distal extremity and an exterior diameter, a transducer, conductive means connected to the transducer and extending interiorly of the coil spring and of the passage of the flexible elongate tubular element a thin protective insulating conformal coating on the transducer means for securing the transducer with its conformal coating to the distal extremity of the coil spring, said conformal coating on said transducer serving to isolate the transducer from the coil spring, said means for securing said transducer to said coil spring and said transducer with said conformal coating thereon having an exterior diameter no greater than that of the exterior diameter of the coil spring.
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 element and having a tapered distal extremity extending beyond the distal extremity of the tubular element a, coil spring extending over the core wire, the coil spring having a distal extremity and an external diameter, a transducer first and second conductor means carried by the tubular element and connected to the transducer and extending to the distal extremity of the tubular element, means for bonding the tubular element to the core wire and the coil spring to the tubular element to the core wire so that torsional forces applied to the tubular element are supplied to the coil spring, a protective conformal insulating coating on the transducer means for securing the transducer with the conformal coating thereon to the distal extremity of the coil spring, said conformal coating serving to isolate the transducer from the coil spring, said means for securing the transducer to the coil spring and said transducer with the conformal coating thereon having an exterior diameter no greater than the exterior diameter of the coil spring.
Dependencies are inferred from the claim text.