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US 6,187,199 B1Granted
Process and device for determining hemodialysis parameters
AssigneeFresenius Medical Care Deutschland GmbH
InventorRainer Goldau
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AssigneeFresenius Medical Care Deutschland GmbH
InventorRainer Goldau
Estimating the term…
A method is described for determining hemodialysis parameters during an extracorporeal blood treatment according to which the blood to be treated in an extracorporeal circulation flows through the blood chamber of a dialyzer divided by a semipermeable membrane into the blood chamber and a dialysate chamber, and dialysate in a dialysate path flows through the dialysate chamber of the dialyzer. According to the method pursuant to the invention, the hemodialysis parameter can also be determined when no balanced state has yet been established. The method according to the invention is based on the response of the dialyzer to a pulse function as inlet signal (pulse response) from the course over time of the physical or chemical characteristic quantity of the dialysate upstream and downstream of the dialyzer. The hemodynamic parameter is then determined from the pulse response of the dialyzer.
A method of determining a hemodialysis parameter during hemodialysis comprising the steps of:
A method of determining a hemodialysis parameter during hemodialysis comprising the steps of:
A device for determining a hemodialysis parameter comprising (a) a dialyzer divided by a semipermeable membrane into a blood chamber having an inlet and an outlet and a dialysate chamber having an inlet and an outlet, (b) an extracorporeal blood circulation unit connected to the blood chamber for providing blood to the blood chamber, (c) a dialysate path connected to the dialysate chamber for providing dialysate to the dialysate chamber, (d) means for changing a characteristic quantity of the dialysate in the dialysate path upstream from the dialysate chamber in a predetermined time interval and generating an inlet signal for the change of the quantity (e) means for measuring the characteristic quantity of the dialysate in the dialysate path downstream from the dialysate chamber and generating an outlet signal from the measured quantity, (f) a storage unit adapted to receive and store the inlet signal and outlet signal in chronological sequence, and (g) a microprocessor connected to the storage unit that is adapted for determining the hemodialysis parameter, wherein the microprocessor determines a pulse response of the dialyzer by comparing the inlet signal and outlet signal and determines the hemodialysis parameter using the pulse response.
Dependencies are inferred from the claim text.