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:
Sep. 22, 1998
Filed:
Aug. 28, 1997
Siemens-Elema AB, Solna, SE;
Abstract
A flow regulator, suitable for use in a respirator/ventilator, has a conduit through which a medium flows whose flow is to be regulated and a choke valve arranged outside the conduit. The choke valve includes a first solenoid, a pressure actuator that is moved by the shaft end of the first solenoid, and a fixed element with the conduit disposed between the pressure actuator and the fixed element. Actuation of the first solenoid displaces the pressure actuator so as to alter the cross-section of the conduit. The shaft of the first solenoid exhibits an effective stroke length so that the pressure actuator, in a first limit position, leaves the flow cross-section of the conduit unaltered and, in a second limit position, partially compresses the conduit against the detent. The flow regulator is made lightweight and inexpensive and also has a comparatively low power consumption by using a second solenoid having a shaft which exhibits a short effective stroke length compared to the shaft of the first solenoid. In the end position shaft of the second solenoid exerts a pressure against the pressure actuator so as to compress the conduit further than the compression produced by the first solenoid and thereby to entirely suppress the flow.