Surgery – Blood drawn and replaced or treated and returned to body – Constituent removed from blood and remainder returned to body
Patent
1994-08-09
1996-12-31
Willse, David H.
Surgery
Blood drawn and replaced or treated and returned to body
Constituent removed from blood and remainder returned to body
604 28, 604 4, A61M 3700, A61M 100
Patent
active
055889590
ABSTRACT:
There is disclosed a method for rapidly and inexpensively determining the amount of recirculation in a patient undergoing a dialysis treatment comprising measuring temperature of an arterial limb and a venous limb of a dialysis access, decreasing temperature of blood being returned to the patient from about 0.5.degree. C. to about 30.degree. C. without adding volume, and measuring temperature of the arterial limb and the venous limb of the dialysis access to determine if there is a temperature drop in the arterial limb as evidence of recirculation. There is further disclosed an improved blood tubing set for use in dialysis and for simultaneously determining recirculation according to the inventive method herein, comprising a blood tubing set having an arterial limb comprising an arterial access device and an arterial tube and having a venous limb comprising a venous access device and a venous tube, wherein an access device comprises a means for obtaining or returning blood from or to an individual, wherein the improvement comprises a means for measuring temperature in the arterial limb and a means for measuring temperature in the venous limb.
REFERENCES:
patent: 4808159 (1989-02-01), Wilson
Greenwood et al., "Assessment of arteriovenous fistulae from pressure and thermal dilution studies: Clinical experience in forearm fistulae", Clinical Nephrology 23:189, 1985.
Tattersall et al., Nephrol. Dial. Transplant 8:60, 1993.
Ahmad Suhail
Ahmed Mahboob
Cole James J.
Oster Jeffrey B.
Polutta Mark O.
University of Washington
Willse David H.
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