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US 4,787,627 AGranted
Visual pressure monitor for respiratory breathing apparatus
AssigneeTrustees of Dartmouth College
InventorJ. Andrew Daubenspeck
Life of this patent
Estimating the term…
Abstract
An apparatus to visually and instantaneously indicate the pressure at the mouthpiece of a respiratory apparatus. The apparatus comprises a rigid tube with an aperture formed in the tube wall. Over the tube and covering the aperture is a flexible membrane which will deflect when the internal pressure differs from the external pressure. Mounted in communication with the flexible membrane is a pointer mechanism which provides a visual indication of the magnitude of the deflection of the flexible membrane.
Claims4
A visual pressure monitor for respiratory breathing apparatus comprising:
- (a) a rigid breathing tube containing an aperture in the wall thereof;
- (b) a flexible membrane covering said aperture;
- (c) a pointer mechanism in communication with the flexible membrane which is movable to indicate deflection in the flexible membrane;
- (d) a pushrod located between the flexible membrane and the pointer mechanism;
- and
- (e) a means for providing a visual indication of the magnitude of deflection of the flexible membrane.
3 more elements
Dependencies are inferred from the claim text.