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AssigneeCardiometrics, Inc.
InventorsMenahem Nassi, Paul D. Corl, Ronald G. Williams, Mark W. Cowan, Jerome Segal
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Apparatus for measuring volumetric flow of a liquid in a vessel having a wall and having an axis extending longitudinally of the vessel parallel to the vessel wall. A flexible catheter is adapted to be disposed in the vessel. First and second ultrasonic transducers are carried by the catheter on one side of the catheter and face the wall of the vessel so that the beams from the transducers each cross substantially the longitudinal axis of the vessel. The first transducer beam is inclined at an angle with respect to the longitudinal axis of the vessel. The second transducer beam is inclined in a direction which is generally perpendicular to the longitudinal axis of the vessel.
In an apparatus for measuring volumetric flow of a liquid in a vessel having a wall and having an axis extending longitudinally of the vessel parallel to the vessel wall, a flexible catheter adapted to be disposed in the vessel, first and second ultrasonic transducers carried by the catheter on one side of the catheter and facing the wall of the vessel so that respective first and second transducers from the transducers each approximately cross the longitudinal axis of the vessel, the first transducer beam being inclined at an angle with respect to the longitudinal axis of the vessel, the second transducer beam being inclined in a direction which is generally perpendicular to the longitudinal axis of the vessel and instrumentation means connected to the first and second ultrasonic transducers in conjunction with said instrumentation means whereby the first transducer measures the velocity profile of the flow of the liquid in the vessel by Doppler shift measurement and the second transducer in conjunction with said instrumentation means measures at least a portion of the diameter of the vessel and the velocity profile of the flow of the liquid in the vessel.
In an apparatus for measuring volumetric flow of a liquid in a vessel having a wall and having an axis extending longitudinally of the vessel parallel to the vessel wall, a flexible catheter adapted to be disposed in the vessel, first and second ultrasonic transducers carried by the catheter on one side of the catheter and facing the wall of the vessel so that the beams from the transducers each approximately cross the longitudinal axis of the vessel, the first transducer beam being inclined at an angle with respect to the longitudinal axis of the vessel and the second transducer beam being inclined in a direction which is generally perpendicular to the longitudinal axis of the vessel, said flexible catheter being formed of a plastic which is resilient, resistant to creep and tensile or torsional strain with a hardness range of Shore 40D to 55D so that the transducer beam locations are stable during liquid flow through the vessel.
In an apparatus for measuring volumetric flow of a liquid in a vessel having a wall and having a axis extending longitudinally of the vessel parallel to the vessel wall, a flexible catheter adapted to be disposed in the vessel, first and second ultrasonic transducers carried by the catheter on one side of the catheter and facing the wall of the vessel so that the beams from the first and second transducers each approximately cross the longitudinal axis of the vessel, a third transducer carried by the catheter opposite the side on which the second transducer is carried, the first transducer beam being inclined at an angle with respect to the longitudinal axis of the vessel, the second and third transducer beams being inclined in a direction which is substantially perpendicular to the longitudinal axis of the vessel.
Dependencies are inferred from the claim text.