METHOD FOR ADJUSTING A CONTINUOUS DIALYSATE VOLUME FLOW IN A DIALYSIS MACHINE AND DIALYSIS MACHINE

• US 20120310148A1
• Filed: 05/31/2012
• Published: 12/06/2012
• Est. Priority Date: 06/03/2011
• Status: Active Grant

• Current Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius SE & Co. KGaA)
• Original Assignee: Fresenius Medical Care Deutschland GmbH (Fresenius SE & Co. KGaA)
• Inventors: HEDMANN, Frank, Griessmann, Erik, Wich-Heiter, Joachim, Sven, Sebesta
• Granted Patent: US 9,694,126 B2
• Time in Patent Office: Days
• US Class Current: 604/28
• CPC Class Codes: A61M 1/1522 the interface being evacuated interfaces to enhance contact
• CPC Class Codes: A61M 1/1524 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/153 the cassette being adapted for heating or cooling the treating fluid, e.g. the dialysate or the treating gas
• CPC Class Codes: A61M 1/154 with sensing means or components thereof
• CPC Class Codes: A61M 1/155 with treatment-fluid pumping means or components thereof
• CPC Class Codes: A61M 1/1561 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/1565 Details of valves
• CPC Class Codes: A61M 1/159 specially adapted for peritoneal dialysis
• CPC Class Codes: A61M 1/1601 Control or regulation
• CPC Class Codes: A61M 1/166 Heating for sterilisation A61M1/1686
• CPC Class Codes: A61M 1/28 Peritoneal dialysis ; Other peritoneal treatment, e.g. oxygenation
• CPC Class Codes: A61M 1/282 Operational modes
• CPC Class Codes: A61M 2205/3379 Masses, volumes, levels of fluids in reservoirs, flow rates
• CPC Class Codes: A61M 2206/22 eliminating pulsatile flows, e.g. by the provision of a dampening chamber

Abstract

The present invention relates to a method for adjusting a continuous dialysate volume flow in a dialysis machine with at least two discontinuous pumps and a controller for generating a desired volume flow of the dialysate. In accordance with the invention, for generating a rather continuous, highly constant dialysate volume flow the energy for driving the pumps is set to be constant with a value determined corresponding to the pump-time volume of the respective pump and the delivered volume. The invention also relates to a dialysis machine for carrying out the aforementioned method.

Claims

1. A method for adjusting a continuous dialysate volume flow in a dialysis machine with at least two discontinuous pumps and a controller for generating a desired volume flow of the dialysate,

characterized in

that the energy for driving the pumps is set to be constant with a value determined corresponding to the pump-time volume of the respective pump and the delivered volume.

2. The method according to claim 1, characterized in that the pressure in the dialysate delivered is measured and that upon exceedance of an adjustable pressure limit value the pumps are stopped.

3. The method according to claim 1, characterized in that the energy set for supplying the pumps is determined for each further pump stroke in a pump cycle by taking account of the pump-time volume, the delivered volume and possibly the exceedance of the pressure limit value.

4. The method according to claim 1, characterized in that the energy set for supplying the pumps for the first pump stroke is taken as estimate from an estimate table.

5. The method according to claim 1, characterized in that when using diaphragm pumps the diaphragm characteristic is taken into account.

6. The method according to claim 5, characterized in that the point of the diaphragm tension is determined, at which the diaphragm pump no longer pumps at the end of a pumping stroke.

7. The method according to claim 5, characterized in that the point of the diaphragm tension is determined at which no more diaphragm tension acts.

8. A dialysis machine for carrying out a method according to claim 1 with two discontinuous pumps and a control unit for actuating the pumps, characterized in that the control unit comprises means for determining the energy to be employed for a pump cycle of the pumps.

9. The dialysis machine according to claim 8, characterized in that the discontinuous pumps are diaphragm pumps.

10. The dialysis machine according to claim 9, characterized by a means for determining the diaphragm pressure of the pump diaphragms.