Methods of and apparatus for positioning and aiming an ultrasoni

Details Methods of and apparatus for positioning and aiming an ultrasoni Methods of and apparatus for positioning and aiming an ultrasoni

1986-04-29

1989-08-22

Jaworski, Francis

Surgery

Truss

Pad

A61B 800

Patent

active

048586145

ABSTRACT:
A method of aiming an ultrasonic transducer at the center of a blood vessel such as a descending aorta. Automatic gain control is employed to amplify the transducer output signal to a constant level, and the transducer is manipulated until the gain in the amplifier circuitry reaches a minimum. The transducer output signal is used in calculating the cardiac output of the patient and/or his or her cardiac index and/or systemic vascular resistance.

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patent: 4509526 (1985-04-01), Barnes et al.
patent: 4796634 (1989-01-01), Huntsman et al.
Baker, D. W. et al., "Pulsed Ultrasonic Doppler Blood-Flow Sensing", IEEE Trans. on Sonics & Ultrasonics, vol. SU-17, No. 3, Jul. 1970, pp. 170-184.
Doriot, P. A. et al., "Quantitative Analysis of Flow Conditions in Simulated Vessels and Large Human Arteries and Veins by Means of Ultrasound", Conf. Proc. of the 2D. Europ. Congress on UTS in Medicine, Munich Germany, (May 12-16, 1975) pp. 160-168.

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