Patent · US Expired

Pumping and metering device

US6672841B1 · kind B1 · utility

66Cited by

10References

17Claims

0Family size

Assignee

Fresenius Medical Care Deutschland GmbH · DE

Inventors

Martin Herklotz · Heusenstamm, DE
Hans-Peter Schneider · Stuttgart, DE
Jörg Bigalke · Frankfurt, DE
Rainer Dönig · Frankfurt, DE
Jürgen Häcker · Neu-Anspach, DE

Key dates

Filing date	Nov 18, 1999
Grant date	Jan 6, 2004
Priority date	—
Expiry date	Nov 18, 2019

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04B2203/0902
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.