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Pumping and metering device

Imported: 24 Feb '17 | Published: 06 Jan '04

Martin Herklotz, Hans-Peter Schneider, Jörg Bigalke, Rainer Dönig, Jürgen Häcker

USPTO - Utility Patents

Abstract

The present invention relates to a pumping device for delivering and metering fluids, in particular medical fluids such as dialysis fluids, with a piston unit having a driving device and a piston and with a membrane unit which has a membrane and a first chamber bordered by the membrane. The pumping device also has a hydraulic unit which has a space to accommodate a hydraulic fluid which is connected to the piston of the piston unit and to the first chamber of the membrane unit. The reliability of metering by such a pumping device is increased by providing a control unit for guaranteeing a predefinable metering rate and/or quantity and also providing a measuring device by means of which the axial position of the piston unit can be determined directly and which can be connected to the control unit.

Description

Additional details and advantages of the pumping device according to the present invention are apparent from the drawings, which show:

BRIEF DESCRIPTION OF THE FIGURES

FIG.

1: a schematic diagram of the pumping device according to the present invention;

FIG.

2: a perspective view of the pumping device according to the present invention with the piston unit and the membrane unit; and

FIG.

3: a sectional diagram through a pumping device according to the present invention with a membrane unit having a two-layer membrane.

Claims

1. A pumping device for delivering and metering medical fluids comprising:

2. The device of claim 1, wherein the pumping unit output is selected from the group consisting of the metering rate and quantity of fluid.

3. The device of claim 1, wherein the pumping unit has a driving device and a piston.

4. The device of claim 3, wherein the piston includes a piston head and a piston shaft.

5. The device of claim 4, wherein the measuring device is adapted to measure the pumping unit output by determining the axial position of the piston.

6. The device of claim 1 where the measuring device includes sensors selected from the group consisting of optical, electromechanical and electrical sensors.

7. The device of claim 3, wherein the piston is arranged on a chassis.

8. The device of claim 1, wherein the membrane has a first and a second layer of a non-stretching material forming an interspace therebetween, the interspace being filled with a non-compressible medium such that the membranes have an outward bulge.

9. The device of claim 8, wherein the non-compressible medium is a spacer.

10. The device of claim 4, wherein the measuring device is adapted and arranged to determine the axial position of the piston shaft.

11. The device of claim 2, further comprising a computer connected to the measuring device and the control unit, wherein the computer is adapted for calculating parameters for the pumping device, wherein the parameters are selected from the group consisting of volume of fluid delivered, metering rate or delivery rate.

12. The device of claim 3, wherein the driving device includes a linear drive.

13. The device of claim 12, wherein the linear drive is selected from the group consisting of eccentric drives, spindle drivers, rack and pinion drives, pneumatic pistons and compressor drives.

14. The device of claim 1 wherein the hydraulic unit includes a vent valve.

15. The device of claim 11 wherein the computer is integrated into the control unit.

16. A pumping device for delivering and metering medical fluids comprising:

wherein movement of fluid in the first chamber induces movement of fluid in the second chamber.

17. The device of claim 16, wherein the membrane pump head is detachably mounted on the membrane unit.