Patent ID: 6415642
Filing Date: 2002-07-09
Classification: A61B

Abstract:
A calibrating apparatus for operatively testing the accuracy of a DLco testing machine; said calibrating apparatus comprising:a) a frame; b) a first syringe with a first movable piston forming a first gas receiving chamber of variable size; c) a second syringe with a second movable piston forming a second gas receiving chamber of variable size; and d) a gas manifold selectively flow connecting to said first and second chambers and during operation of said apparatus being adapted to flow connect with the testing machine; said manifold including a single multiple position valve that selectively flow connects said first and second syringes with said manifold; said manifold also including a coupling for flow connecting with the testing machine; said valve and said coupling being in close proximity to one another to minimize contamination of test gas from said second syringe by residual gas in said manifold during use.