Controller for ultrafiltration blood circuit which prevent...

Details Controller for ultrafiltration blood circuit which prevent... Controller for ultrafiltration blood circuit which prevent...

2008-07-14

2011-12-06

Deak, Leslie (Department: 3761)

Surgery

Blood drawn and replaced or treated and returned to body

Constituent removed from blood and remainder returned to body

C604S005040, C604S006110, C210S645000, C210S647000, C210S741000

Reexamination Certificate

active

08070707

ABSTRACT:
A device for continuously measuring osmotic pressure of blood flowing through an extracorporeal blood circuit including: a blood passage further comprising a withdrawal blood passage connectable to a blood vessel in a patient and an infusion blood passage connectable to a blood vessel in a patient; a filter further comprising a filtrate chamber, a blood chamber and a permeable membrane separating the filtrate chamber and blood chamber, wherein the blood chamber is in fluid communication with the blood passage; a pressure sensor measuring a pressure difference between the filtrate chambers and the blood chamber, and a controller receiving a pressure signal from the pressure sensor, determining an osmotic pressure across the permeable membrane of the filter, and adjusting a rate of removal of fluid from blood in the filter if the determined osmotic pressure level varies from a predetermined osmotic pressure setting.

REFERENCES:
patent: 4202764 (1980-05-01), Afflerbaugh et al.
patent: 4351731 (1982-09-01), Perrot
patent: 4469593 (1984-09-01), Ishihara et al.
patent: 4684460 (1987-08-01), Issautier

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