Pumping arrangement for supplying a ventilating apparatus with breathing gas

US4922900A · kind A · utility

Assignee

• DRAGERWERK AKTIEGESELLSCHAFT · DE

Inventors

• Siegfried Kiske · Lübeck, DE
• Thorsten Haase · Wulfen, DE
• Thomas Leyer · Lübeck, DE
• Wolfgang Sauer · Glückstadt, DE

Key dates

• Filing date: May 16, 1989
• Grant date: May 8, 1990
• Expiry date: May 16, 2009

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M16/006
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention is directed to a pumping arrangement for supplying a ventilating apparatus with breathing gas. The pumping arrangement includes a piston which runs in a cylinder and the piston is connected via a coupling with a drive unit for generating the pumping strokes. The coupling engages a motion transmitter in the form of a piston rod. Gas connecting ports for the breathing gas to be pumped open into the inner chamber of the cylinder. The pumping arrangement permits the piston-cylinder unit to be simply removed and to be reinstalled with reliable guidance. An automatic latching occurs such that a release and removal of the piston-cylinder unit from the ventilating apparatus and its uncoupling from the drive unit is possible only in a rest condition and not during operation. For exchanging the piston-cylinder unit, the motion actuator in the form of the piston rod moves through a preparatory stroke having an end position in which the coupling as well as the latching of the piston-cylinder unit with respect to the housing can be actuated.