Accession Number : ADD012914

Title :   Arterial Blood Velocity to Volume Flow Converter.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Crosbie,Richard J ; Colombo,Joseph ; Grant,J W

Report Date : 26 May 1987

Pagination or Media Count : 6

Abstract : A arterial blood velocity-to-volume flow rate converter, including a pair of function generators a computer, and a multiplier, is incorporated within a system to objectively measure by non-invasive means the blood volume flow rate to the head of an occupant in a rapidly accelerating vehicle, and take corrective measure to stabilize the vehicle when that flow falls below a preselected lower for a predetermined length of time. A conventional ultrasonic Doppler velocimeter determines the blood velocity, subsequently feeding a representive signal to pressure generator. The output thereform is then fed to a cross-sectional area signal generator which determines the time-varying area of the artery, a signal representing such being fed to the multiplier along the velocity signal to compute the flow. When that flow falls below a pre-selected lower limit for a predetermined length of time determined by a comparator and timer, a command signal is sent to override circuitry to stabilize the vehicle.

Descriptors :   *PATENTS, *BLOOD VOLUME, *VELOCIMETERS, *CONVERTERS, *AUTOMATIC PILOTS, ARTERIES, VELOCITY, DOPPLER SYSTEMS, ULTRASONICS, TIME INTERVALS, GENERATORS, LIMITATIONS, SELECTION, TIME, SIGNALS, SIGNAL GENERATORS, CIRCUITS, BLOOD CIRCULATION, OVERRIDE CONTROL, ACCELERATION TOLERANCE, BLACKOUT(PHYSIOLOGY), CONSCIOUSNESS, BLOOD PRESSURE, VARIATIONS, FLOW, VOLUME

Subject Categories : Flight Control and Instrumentation
      Anatomy and Physiology
      Biomedical Instrumentation and Bioengineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE