Used for exercise testing and allowed relatively continuous gas collection and sampling. From an undated Collins publicity photo.
Category Archives: Valve
Valve, Armstrong-Mohler, 1969, Diagram
From Journal of Applied Physiology, 1969 27(5): page 765.
“O2 deficit and debt. A collection bag is connect to each outlet (A, B, C, D). Initially when the valve is in the position shown, exhaled gas flows from the mouthpiece and into the bag on the outlet which is in position A. When this collection period ends the outer rim is rotated so that outlet A is in position B, and an empty bag is in position A. When the next collection period begins a third empty bag is in position A, the second collection bag is in position B and the first bag is in position C and ready for sampling. When the fourth collection period begins the above sequence is repeated, and the first bag is rotated into position D and emptied into the Tissot. The first bag is ready to be refilled when turned to position A at the beginning of the 5th gas collection.
Valve, Hans Rudolph, 5-Way, P-326, 1966
Nickel-plated brass. From ‘A Catalog of Pulmonary Function Equipment and Accessories”, Collins, 1966, page 25.
Valve, Hans Rudolph, Small High Velocity, P-309, 1966
Made of nickel-plated brass. From ‘A Catalog of Pulmonary Function Equipment and Accessories”, Collins, 1966, page 22.
Valve, Hans Rudolph, Large High-Velocity, P-308, 1966
Made of nickel-plated brass. From ‘A Catalog of Pulmonary Function Equipment and Accessories”, Collins, 1966, page 22.
Valve, Hans Rudolph, 5-way, P-310, 1966
Intended for Residual Volume measurements. From ‘A Catalog of Pulmonary Function Equipment and Accessories”, Collins, 1966, page 23.
Valve, Collins Rahn-Otis End-Tidal Sampler, 1982
An ingenious valve that used inspiratory and expiratory pressures to fill a small sampling balloon (yes, a condom) with end-tidal gas for steady-state DLCO tests. Valve is pictured upside down. In use the sampling balloon extended below, not above, the mouthpiece. From the 1982 Collins Supply Catalog.
Valve, Collins 5-Way, 1982
From the 1982 Collins Supply Catalog.
Valve, Collins 5-Way for DLCO testing, 1982
Yes, at one time there were no automated single-breath DLCO systems and patients were stepped through the maneuver manually. Unseen is the opening for the patient mouthpiece on the back of the valve. The opening on the left was for the rubber alveolar sample bag. From the 1982 Collins Supply Catalog.
Valve, Collins Free-Breathing with Bypass, Large, 1982
From the 1982 Collins Supply Catalog.