Ultrasonic doppler blood flowmeter

Details Ultrasonic doppler blood flowmeter Ultrasonic doppler blood flowmeter

1988-10-04

1989-07-18

Jaworski, Francis

Surgery

Truss

Pad

A61B 806

Patent

active

048483567

ABSTRACT:
An ultrasonic Doppler blood flowmeter measures the velocity of blood flow at an arbitrary position of the body of a subject by making use of Doppler shift of an ultrasonic echo signal. The echo signal including Doppler shift from the blood flow of the body is detected in phase on the basis of standard reference signal, and the distance to an intended position is extracted from the phase detected signal and is integrated, and the direct-current component or ultraflow frequency component of the Doppler shift signal obtained from the integrator means is fed back negatively to the integrator means. As a result, the echo signal components of the body tissues are removed, and the frequency of blood flow only can be analyzed, so that an accurate blood flow information may be obtained.

REFERENCES:
patent: 3763851 (1973-10-01), Haff et al.
patent: 3934577 (1976-01-01), Romani
patent: 3991365 (1976-11-01), Takeuchi
patent: 4357944 (1982-11-01), Mauser et al.
patent: 4541437 (1985-09-01), Amemiya
patent: 4583409 (1986-04-01), Lannuzel et al.
patent: 4612937 (1986-09-01), Miller
patent: 4660565 (1987-04-01), Shirasaka
patent: 4680739 (1987-07-01), Lannuzel
patent: 4693319 (1987-09-01), Amemiya

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