Calibrated air tube for spirometer

Details Calibrated air tube for spirometer Calibrated air tube for spirometer

1996-06-21

1998-02-10

Bahr, Jennifer

Surgery

Truss

Pad

128720, 128726, H61B 508

Patent

active

057158312

ABSTRACT:
The present air tubes include a resistive element which is located in the hollow space of the tubular portion. This resistive element is adapted for providing a linear resistance-versus-pressure response is sized and adapted to cause a pressure difference or differential as air flows in the hollow space across this element. The resistive element includes a planar member having a first face and a second face, and a circular parameter connecting the first face to the second face. An aperture is formed in a center of the planar member for connecting the first face to the second face. A plurality of slots in the planar member extend radially from the aperture, thereby forming a plurality of hinged windows in the planar member. Each of the slots includes a central end and a distal end. The resistive element further includes a plurality of hinge slots. Each hinge slot is connected to a distal end of a slot, and extends generally perpendicularly to an axis of the slot. A total number of hinge slots corresponds to a total number slots.

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