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AssigneeFresenius Medical Care Duetschland GmbH
InventorsArne Peters, Christoph Wiktor, Gokhan Orter
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The invention relates to a positive displacement pump 1 for conveying medical fluids, which pump has a pumping chamber 5 and a positive displacement element 15, and to a blood treatment apparatus comprising a positive displacement pump 1. In addition, the invention relates to a method for controlling a positive displacement pump 1 for conveying medical fluids. The positive displacement pump 1 according to the invention has an actuation member 20 in operative connection with the positive displacement element 20 for displacing or deforming the positive displacement element in order to convey the fluid into the pumping chamber or out of the pumping chamber, and a drive device 21 for displacing the actuation member 20. A control unit 14 is provided for to controlling the drive device 21 and an inlet valve 12 and outlet valve 13. The actuation member 20 is in operative connection with the positive displacement element 15 via a working chamber 19 that is filled with gas and has a sealed volume. In order to achieve a high conveying precision, the pressure in the working chamber 5 is kept constant when the positive displacement element 15 is moved.
A positive displacement pump for pumping medical fluids, comprising a pumping chamber, a positive displacement element, an actuation member in operative connection with the positive displacement element and configured for displacing or deforming the positive displacement element in order to convey medical fluid into the pumping chamber or out of the pumping chamber, a drive device for displacing the actuation member, an inlet valve, an outlet valve, a displacement path sensor, and a control unit for controlling the drive device, the inlet valve, and the outlet valve,
A method for controlling a positive displacement pump for pumping medical fluids, wherein the positive displacement pump comprises a pumping chamber, a positive displacement element, an actuation member in operative connection with the positive displacement element for displacing or deforming the positive displacement element, a drive device for displacing the actuation member, an inlet valve, an outlet valve, and a displacement path sensor,
A positive displacement pump for pumping medical fluids, comprising a pumping chamber, a positive displacement element, an actuation member in operative connection with the positive displacement element and configured for displacing or deforming the positive displacement element in order to convey medical fluid into the pumping chamber or out of the pumping chamber, a drive device for displacing the actuation member, an inlet valve, an outlet valve, and a control unit configured to control the drive device, the inlet valve, and the outlet valve, wherein
A method for controlling a positive displacement pump for pumping medical fluids, wherein the positive displacement pump comprises a pumping chamber, a positive displacement element, an actuation member in operative connection with the positive displacement element for displacing or deforming the positive displacement element, a drive device for displacing the actuation member, an inlet valve, and an outlet valve, wherein the method comprises actuating the positive displacement element by the actuation member via a sealed volume of gas that is enclosed in a working space, actuating the outlet valve depending on the pressure in the working space such that the pressure in the working space remains constant when the actuation member is displaced, and displacing the actuation member such that a pump output corresponds to a preset target pump output or a conveyance rate corresponds to a preset target conveyance rate.
Dependencies are inferred from the claim text.