Apparatus for running off liquids from sealed vessels

US4551147A · kind A · utility

Assignee

• Fresenius AG · DE

Inventors

• Bernd Mathieu · Spiesen, DE
• Wolfram Weber · Friedrichsthal, DE

Key dates

• Filing date: Jan 31, 1983
• Grant date: Nov 5, 1985
• Expiry date: Jan 31, 2003

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2005/1623
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A universal infusion apparatus for use with sterile, sealed bottles of infusion liquid has a hydrophobic filter for stopping possible loss of liquid through the air duct, that is used for letting air into the vessel to take the place of the liquid run off therefrom. The air filter is furthermore used for stopping bacteria from the outside air being taken up into the vessel. For decreasing the degree of vacuum necessary for starting operation of the filter when there is liquid on the inside face of it so that there is no danger of the bottle collapsing, there is an air trap or storage space in which air will be kept when liquid makes its way through the air duct. Air may then be let off from the trap through an air pipe, which comes to an end a very small distance from the inside face of the filter so that only a very small degree of vacuum is needed for moving air as a bubble out of the pipe against the inner side of the filter which is then primed and will let air through at a lower degree of vacuum than would otherwise be the case.