The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 1992
Filed:
Jan. 05, 1990
Dragerwerk Aktiengesellschaft, Lubeck, DE;
Abstract
The invention is directed to a ventilating apparatus including a ventilating device and a closed breathing circuit wherein fresh gas is metered by means of a controller via a fresh gas line. A reservoir having a changeable volume is connected to the fresh gas line. In this way, at least the quantity of respirating gas which is consumed is again replenished. This arrangement is improved such that a very small quantity of respirating gas can be metered with the compliance of the entire system being low and remaining necessarily constant. With the invention, a system is obtained which is easy to control with the smallest possible configuration and least complex measuring sensors. For this purpose, a reservoir connected downstream of the metering unit is branched off of the fresh gas line and is provided with a level indicator. The signal of the level indicator indicates the level and is supplied as an actual value to the controller and compared to a pregiven desired value. A cutoff device is interposed ahead of the location at which the fresh gas line communicates with the breathing circuit.