Surgery – Truss – Perineal
Patent
1974-03-25
1978-08-29
Howell, Kyle L.
Surgery
Truss
Perineal
73622, 128 205Z, A61B 1000
Patent
active
041096428
ABSTRACT:
Continuous wave ultrasonic sound waves from a transmitter and receiver are highly focused to a width of approximately 1 millimeter or less and are transmitted and received through intersecting paths within the tissue of a patient. A doppler flow detector produces an image of the moving blood within the vessel. The transmitter and receiver are systematically scanned over the subject and the detected images are converted into visually intelligible pictures.
An improved circuit for more clearly defining the flow picture of the moving blood particles utilizes a conventional directional doppler circuit plus a multiplier-differentiator-low pass filter circuit to automatically eliminate venous flow signals. A grey scale oscilloscope provides brightness intensity on the visual picture proportional to the velocity and direction of the blood flow for detecting stenosis in the vessel.
A recording technique is disclosed for detecting atherosclerotic thickening of the artery wall.
A multiple beam scanner is disclosed which requires movement only in the longitudinal direction of the vessel.
REFERENCES:
patent: 3023611 (1962-03-01), Howry
patent: 3086390 (1963-04-01), Brown
patent: 3090030 (1963-05-01), Schuck
patent: 3480002 (1969-11-01), Flaherty et al.
patent: 3577772 (1971-05-01), Perilhou
patent: 3690311 (1972-09-01), Schorum et al.
patent: 3777740 (1973-12-01), Hokanson
patent: 3778756 (1973-12-01), Houston et al.
patent: 3805596 (1974-04-01), Klahr
patent: 3827115 (1974-08-01), Bom
Reid John M.
Spencer Merrill P.
Howell Kyle L.
Institute of Applied Physiology & Medicine
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