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US 6,733,676 B2Granted
Dialyzing system and method of operating the same
AssigneesNipro Corporation, Nikkiso Co., Ltd., Nextier Corporation
InventorIchiro Takai
Life of this patent
Estimating the term…
Abstract
A dialyzing system comprises a dialyzer 10 and an ultrafiltration-regulating unit 24 for regulating inflow and out flow of a dialysate to or from the dialyzer 10 to regulate ultrafiltration. The dialyzing system is adapted to determine a blood pressure from a dialysate pressure detected by a pressure transducer 28 at the time of temporary suspension of the ultrafiltration without use of a special line for measurement of pressure in the blood flow line and free from danger of blood leakage from the blood flow line.
Claims14
A dialyzing system comprising:
- a dialyzer having a dialysate outflow line and a dialysate inflow line;
- an ultrafiltration unit connected to the dialyzer by the dialysate outflow line and the dialysate inflow line for regulating a rate of an ultrafiltration process by regulating an outflow rate of a dialysate from the dialyzer so as to become greater than an inflow rate of the dialysate to the dialyzer;
- pressure-detecting means arranged in one of the dialysate flow lines to detect a pressure of the dialysate;
- and
- control means for calculating the pressure of a blood flow line connected to the dialyzer based on the pressure of the dialysate detected by the pressure-detecting means and for calculating a pressure gradient in the blood flow line based on a blood flow rate and a flow resistance of the blood flow line,
- said control means being adapted to determine the pressure of a blood flow line based on the pressure of the dialysate detected by the pressure-detecting means at a time of a temporary stop of the ultrafiltration process caused by temporarily stopping an operation of the ultrafiltration unit,
- wherein the control means monitors and displays the pressure of the blood flow line as a pressure of a specified site of the blood flow line.
4 more elements
A method for operating a dialyzing system, comprising the steps of:
- temporarily stopping an ultrafiltration operation of an ultrafiltration unit to equalize an inflow of a dialysate into a dialyzer and an outflow of the dialysate from the dialyzer;
- detecting the pressure of the dialysate at every temporary stop of the ultrafiltration operation;
- calculating the pressure of a blood flow line connected to the dialyzer from the detected pressure of the dialysate;
- calculating a pressure gradient in the blood flow line based on a blood flow rate and a flow resistance of the blood flow line;
- and
- monitoring and displaying the pressure of the blood flow line as a pressure of a specified site of the blood flow line.
3 more elements
A dialyzing system comprising:
- a dialyzer having a dialysate outflow line and a dialysate inflow line;
- an ultrafiltration unit connected to the dialyzer by the dialysate outflow line and the dialysate inflow line for regulating a rate of an ultrafiltration process by regulating an outflow rate of a dialysate from the dialyzer to a rate greater than an inflow rate of the dialysate to the dialyzer;
- pressure-detecting means arranged in one of the dialysate flow lines to detect a pressure of the dialysate;
- and
- control means for regulating and controlling said ultrafiltration unit to temporarily stop or resume the ultrafiltration process and for determining a pressure of a blood flow line connected to the dialyzer on the basis of the pressure of the dialysate detected by the pressure-detecting means, said control means comprising:
- timer means for alternately generating signals to temporarily stop and to resume the a ultrafiltration process;
- calculating means for determining a pressure of a blood flow line based on the pressure of the dialysate detected by said pressure-detecting means at a time of a temporary stop of the ultrafiltration process caused by the temporary ultrafiltration-stop signal from the timer means;
- and
- means for monitoring and displaying the determined pressure of the blood flow line.
6 more elements
Dependencies are inferred from the claim text.