Surgery – Diagnostic testing – Measuring anatomical characteristic or force applied to or...
Patent
1996-11-12
1998-06-16
Kamm, William E.
Surgery
Diagnostic testing
Measuring anatomical characteristic or force applied to or...
600407, 600534, A61B 511
Patent
active
057662088
ABSTRACT:
A non-acoustic pulse-echo radar monitor is employed in the repetitive mode, whereby a large number of reflected pulses are averaged to produce a voltage that modulates an audio oscillator to produce a tone that corresponds to the heart motion. The antenna used in this monitor generally comprises two flat copper foils, thus permitting the antenna to be housed in a substantially flat housing. The monitor converts the detected voltage to an audible signal with both amplitude modulation and Doppler effect. It further uses a dual time constant to reduce the effect of gross sensor-to-surface movement. The monitor detects the movement of one or more internal body parts, such as the heart, lungs, arteries, and vocal chords, and includes a pulse generator for simultaneously inputting a sequence of pulses to a transmit path and a grating path. The pulses transmitted along the transmit path drive Oh impulse, generator and provide corresponding transmit pulses that are applied to a transmit antenna. The gating path includes a range delay generator which generates timed gating pulses. The timed gating pulses cause the receive path to selectively conduct pulses reflected from the body parts and received by a receive antenna. The monitor output potential can be separated into a cardiac output indicative of the physical movement of the heart, and a pulmonary output indicative of the physical movement of the lung. The impulse generator in the transmit path can be replaced with a pulsed RF generator.
REFERENCES:
patent: 4122427 (1978-10-01), Karsh
patent: 4197856 (1980-04-01), Northrop
patent: 4991585 (1991-02-01), Mawhinney
patent: 5220922 (1993-06-01), Barany
patent: 5573012 (1996-11-01), McEwan
patent: 5638824 (1997-06-01), Summers
Kamm William E.
Layno Carl H.
Sartorio Henry P.
The Regents of the University of California
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