Doppler system for measurement of blood flow during cardiopulmon

Details Doppler system for measurement of blood flow during cardiopulmon Doppler system for measurement of blood flow during cardiopulmon

1986-05-14

1987-09-01

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

128663, G01F 166

Patent

active

046900020

ABSTRACT:
An ultrasonic Doppler flow measurement system for measuring blood flow in a polymer conduit includes an ultrasonic transmitter transducer, an ultrasonic receiver transducer, an amplifier/detector circuit for producing a Doppler signal which varies in frequency as a function of blood velocity, a clipping circuit, an automatic gain control circuit, and a frequency-to-voltage converter which produces an output signal having a voltage which is a function of flow velocity. The automatic gain control circuit accomodates variations in Doppler signal strength due to varying red blood cell concentration. The clipping circuit prevents an inordinate reduction of gain by the automatic gain control circuit due to extremely large, occasional gas bubbles or fat globules in the blood.

REFERENCES:
patent: 3741014 (1973-06-01), Tamura
patent: 3914999 (1975-10-01), Grandchamp
patent: 3974692 (1976-08-01), Hassler
patent: 3987673 (1976-10-01), Hansen
patent: 4062237 (1977-12-01), Fox
patent: 4122713 (1978-10-01), Stasz et al.
patent: 4142412 (1979-03-01), McLeod et al.
patent: 4145925 (1979-03-01), Stasz et al.
patent: 4147059 (1979-04-01), Fathauer
patent: 4257278 (1981-03-01), Papadofrangakis et al.
patent: 4265126 (1981-05-01), Papadofrangakis et al.
patent: 4333353 (1982-06-01), Baumoel
patent: 4391148 (1983-07-01), Sainz et al.
patent: 4391149 (1983-07-01), Herzl
patent: 4413531 (1983-11-01), Karplus et al.

Affiliated with

Also associated with

Rating

Doppler system for measurement of blood flow during cardiopulmon does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Doppler system for measurement of blood flow during cardiopulmon, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Doppler system for measurement of blood flow during cardiopulmon will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1257232