MARK PILIPSKI
Respiratory Therapy in Passaic Park, NJ

5193551, Mar 16, 1993

Jul 27, 1990

7/560851

Mark Pilipski - Passaic Park NJ

A61B 508

128716

A phantom assembly adapted to simulate a human subject to verify the accuracy of a carbon monoxide diffusing capacity (DLco) measuring device for testing the functional integrity of the subject's alveolar-capillary membrane. The device includes a mouthpiece through which the subject inhales a mixture of carbon monoxide and an inert gas in a predetermined ratio. Then after a breath holding interval the subject exhales into the mouthpiece an alveolar sample whose carbon monoxide content is analyzed by the device to evaluate the subject's condition. The assembly includes a phantom whose chamber is interposable between the mouthpiece of the DLco device and a calibration syringe having a known capacity. Within the chamber cavity is a flow tube that extends between valved mouthpiece and syringe ports on opposing end wall of the chamber. The valved port arrangements are such that when the syringe is operated in its negative pressure mode, the flow tube is then blocked and the cavity is unblocked, this blocking action being reversed when the syringe is operated in its positive pressure mode.