Patent Number: 6,192,885

Title: Method for controlling an expiratory valve in a ventilator

Abstract: In a method for controlling an expiratory valve in a ventilator during expiration, the expiratory valve is opened substantially fully for a first interval. Fully opening the expiratory valve has the advantage of minimizing the expiratory resistance a patient needs to overcome. Keeping the expiratory valve open as long as possible during expiration, without losing control of positive end expiratory pressure (PEEP), is therefore advantageous. An optimal system is achieved. In a method wherein pressure in the expiratory section of the ventilator is measured during a second interval, the expiratory valve is regulated so a predetermined end pressure is obtained in the expiratory section, and at least one parameter, directly or indirectly related to control of the expiratory valve, is determined, and a determination is made from that parameter as to whether the next first interval for the next expiration should be longer than, shorter than or as long as the first interval.

Inventors: Jalde; Fredrik (Stockholm, SE)

Assignee: Siemens-Elema AB

International Classification: A61M 16/20 (20060101); H04Q 3/00 (20060101); H04Q 7/22 (20060101); H04L 12/56 (20060101); A61M 16/00 (20060101); H04Q 7/24 (20060101); H04Q 7/38 (20060101); A62B 009/02 ()

Expiration Date: 02/27/2018