Filter for medical fluids

US6347711B1 · kind B1 · utility

Assignee

• B. Braun Melsungen AG · DE

Inventors

• Udo Goebel · Homberg (Efze), DE
• Manfred Friederichs · Homberg (Efze), DE
• Volker Harms · Hamburg, DE
• Manfred Heitmann · Haan, DE
• Tabea Hinkel · Homberg (Efze), DE
• Karl-Heinz Koch · Homberg (Efze), DE
• Hans-Joachim Otto · Homberg (Efze), DE
• Klaus Siemon · Münster, DE
• Martin Sippel · Homberg (Efze), DE

Key dates

• Filing date: Jun 28, 1999
• Grant date: Feb 19, 2002
• Expiry date: Jun 28, 2019

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2205/21
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A filter for medical fluids comprises a hydrophilic membrane (18) dividing the filter into an inlet chamber (20) and an outlet chamber (22). This prevents air from penetrating the outlet chamber (22). The air retained in the inlet chamber (20) is discharged through vent holes (30, 32). Each vent hole (30, 32) is covered with a hydrophobic membrane (34, 36). According to the invention one of the vent holes (30) is provided in a front wall (38) opposite the hydrophilic membrane (18). The other vent hole (32) is provided in a rear wall (46) located opposite the front wall (38) so that the two vent holes (30, 32) point in opposite directions. Owing to this arrangement of the two vent holes (30, 32) one vent hole (30, 32) points upwards irrespective of the filter position. This improves venting of the inlet chamber (20).