Respirator having an inspiration gas flow controlled by the expiration gas flow
First Claim
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1. A respirator comprising:
- an inspiration line and an expiration line each connectable to the airways of a patient;
a source of respiratory gas;
valve means in said inspiration line for setting a flow of respiratory gas from said source to said patient;
at least one gas flow sensor disposed for sensing a gas flow in said expiration line; and
control means, connected to said valve means and to said gas flow sensor, consisting of means for controlling said valve means dependent on a signal from said gas flow sensor for increasing gas flow through said inspiration line, and means, upon the occurrence of a decrease of gas flow in said expiration line below a selected level as sensed by said gas flow sensor, for bringing the gas flow in said expiration line back to said level.
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Abstract
In a respirator having an inspiration gas flow controlled by the expiration gas flow, in order to avoid triggering difficulties, particularly in the neonatal respiration therapy, the respirator is controlled such that a continuous gas flow flows through the inspiration and expiration lines. The gas flow is measured in the inspiration line by a gas flow sensor. The measured signal from the gas flow sensor is used to control a valve in the inspiration line, or a common line connected to the inspiration and expiration lines so that a constant gas flow is maintained in the expiration line.
63 Citations
12 Claims
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1. A respirator comprising:
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an inspiration line and an expiration line each connectable to the airways of a patient; a source of respiratory gas; valve means in said inspiration line for setting a flow of respiratory gas from said source to said patient; at least one gas flow sensor disposed for sensing a gas flow in said expiration line; and control means, connected to said valve means and to said gas flow sensor, consisting of means for controlling said valve means dependent on a signal from said gas flow sensor for increasing gas flow through said inspiration line, and means, upon the occurrence of a decrease of gas flow in said expiration line below a selected level as sensed by said gas flow sensor, for bringing the gas flow in said expiration line back to said level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification