56.22

Spirometer

1935 Approximate

McKesson Spirometer Vital Capacity Apparatus. Material: metal, rubber. Size: 10" x 10 1/2" x 1 1/2". Description: A metal instrument with a teal-colored coating and a rectangular footprint; a large label, colored primarily in gold and red, covers much of its surface lid that opens to reveal the rubber bellows inside; the instrument lacks a breathing tube and a mouthpiece. This volume displacement spirometer provides a recording of a time/ volume curve of a patient’s exhalation. Manufacturer: McKesson Appliance Co., Toledo, OH, USA. Provenance: This instrument was first used in the office of Dr. Henry Fiskety, a Duluth, Minnesota physician. It was later acquired by Dr. David Pope of Janesville, Minnesota.

Function: Spirometry is a test to measure vital capacity of an individual in order to diagnose airway obstruction. A spirometer is an office instrument to provide a measurement of vital lung capacity. 1. Vital capacity – volume of air maximally expelled from the lungs after maximal respiration. 2. Fixed vital capacities – volume of air expelled in a given time 1 second & three second 1 sec – 65% 3 sec – 90% 3. Maximum expiratory flow rate. Ability to expel air from the lungs normal 300-500 l/min

Waseca County News