Patent · US Expired

Method and device for measuring access flow

US6726647B1 · kind B1 · utility

65Cited by

89References

27Claims

0Family size

Assignee

Gambro AB · SE

Inventors

Jan Sternby · Lund, SE
Gary Mishkin · Potomac, US
Perry Asbrink · Malmö, SE
Eddie Nilsson · Höör, SE

Key dates

Filing date	Oct 22, 1999
Grant date	Apr 27, 2004
Priority date	—
Expiry date	Oct 22, 2019

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61M2205/3331
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

An arterial needle removes blood from the access to an extracorporeal circuit comprising a dialyzer and a venous needle returns the blood to the access site. Blood passes along one side of the membrane of the dialyzer and dialysis fluid along the other side. The concentration (Cd norm and Cd rev) of urea in the dialysate emitted from the dialyzer is measured with the needles in the normal position and in a reversed position. The access flow rate before the arterial needle is calculated according to the formula:Cd norm/Cd rev=1+Keff/Qain which Keff is the effective clearance of the dialyzer and Qa is the access flow rate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.