Respiratory air humidifier for respirators

US4146597A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Wolfgang Eckstein · Sereetz, DE
• Frank Benthin · Lübeck, DE

Key dates

• Filing date: Apr 21, 1977
• Grant date: Mar 27, 1979
• Expiry date: Apr 21, 1997

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M16/16
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A respiratory air humidifier comprises a plurality of hollow tubules having walls of a foil material which is impermeable to water but is permeable to steam vapor. The tubules have inside diameters of less than 300 microns and are about 15 microns thick. Breathing gas to be humidified is directed over one side of the foil for example through the tubules and the water is directed over the opposite side for example the exterior of the tubules.