Pumps – Condition responsive control of pump drive motor – By control of electric or magnetic drive motor
Patent
1996-07-30
2000-12-12
Thorpe, Timothy S.
Pumps
Condition responsive control of pump drive motor
By control of electric or magnetic drive motor
4174776, 417 43, 417 29, 417 20, 604 50, 604 9, F04B 4906
Patent
active
061589659
ABSTRACT:
Flow parameters in a fluid delivery assembly are determined by monitoring pressure responses and processing those responses along with information regarding the fluid flow. In one aspect, a processor controls the pump to pump flow quantities in accordance with a pseudorandom code. Portions of the resulting pressure signal sensed at the conduit is averaged, and the averaged values are then decoded in accordance with the pseudorandom code. An estimate of the equilibrium pressure is generated from the decoded average pressure values, while a summation of the pressure samples is generated from the undecoded pressure signals. The resistance to fluid flow of the system is determined from the estimated equilibrium pressure and pressure summation. For low flow rates, a processor controls the pump to pump fluid in a series of fluid boluses, with each fluid bolus delivered in the beginning of a separate timeslot. The equilibrium pressure is measured at the end of each timeslot, and a summation of the pressure samples is generated from the pressure signals. For high flow rates, the pump is controlled to vary the flow rate and the change in pressure is divided by the change in flow to directly determine the resistance. A resistance display continuously displays the resistance of the system. The pseudorandom coding and decoding can be used to filter out pressure-response crosstalk caused by multiple fluid infusion segments feeding into a common line.
REFERENCES:
patent: 4304263 (1981-12-01), Choate
patent: 4460355 (1984-07-01), Layman
patent: 4534756 (1985-08-01), Nelson
patent: 4710163 (1987-12-01), Butterfield
patent: 4743228 (1988-05-01), Butterfield
patent: 4898576 (1990-02-01), Philip
patent: 4938079 (1990-07-01), Goldberg
patent: 4979940 (1990-12-01), Bobo, Jr. et al.
patent: 5087245 (1992-02-01), Doan
patent: 5096385 (1992-03-01), Georgi et al.
patent: 5103211 (1992-04-01), Daoud et al.
patent: 5190041 (1993-03-01), Palti
patent: 5213573 (1993-05-01), Sorich et al.
patent: 5356378 (1994-10-01), Doan
patent: 5423743 (1995-06-01), Butterfield
patent: 5609576 (1997-03-01), Voss et al.
patent: 5803917 (1998-09-01), Butterfield et al.
"Detection of Intravenous Fluid Extravasation Using Resistance Measurements", Scott et al., Journal of Clinical Monitoring, vol. 12, No. 4, (Jul. 1996), pp. 325-330.
"Resistance to Fluid Flow in Veins", Scott et al., Journal of Clinical Monitoring; vol. 12, No. 4 (Jul. 1996), pp. 331-337.
Butterfield Robert D.
Farquhar Allen B.
Alaris Medical Systems, Inc.
Thorpe Timothy S.
Tyler Cheryl J.
LandOfFree
Fluid flow resistance monitoring system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid flow resistance monitoring system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid flow resistance monitoring system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-210539