Disposable balancing unit for balancing fluids, and related medical treatment device

US5836908A · kind A · utility

Assignee

• Fresenius AG · DE

Inventors

• Josef Beden · Mainz, DE
• Hans Flaig · Schramberg, DE
• Bernd Steinbach · Friedberg, DE

Key dates

• Filing date: Dec 9, 1996
• Grant date: Nov 17, 1998
• Expiry date: Dec 9, 2016

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2205/3653
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A disposable balancing unit designed as a sheet bag includes two sheets (1, 2), which are heat-sealed together, forming a balancing chamber (4) that is divided by a flexible wall (8) into the two chamber halves (9, 10), and forming two equalization chambers (5, 6), as well as the channels (15 through 18) connecting the individual chambers. The flexible wall (8), which separates the first chamber half (9) of the balancing chamber (4) from the second chamber half (10), is formed by an intermediate sheet, which is inserted between the first and second sheet (1, 2) in the area of the balancing volume and is heat-sealed in a pressure-tight manner to the outer sheets, forming the first and second chamber half (9, 10). The fixed volume of the balancing chamber halves (9, 10) is specified by a corresponding system insert unit, into which the disposable unit is fittingly inserted. The system insert unit has two rigid receiving bodies (25, 26) with trough-shaped depressions (27) to grasp above or below the balancing chamber (4) of the disposable unit. The disposable balancing unit can be manufactured cost-effectively in a single heat-sealing operation and is easy to handle.