Spirometer with zone graph

Claim 1

A hand-held spirometer for in-home use by an individual disposed to respiratory disorders to measure the individual's current lung expiratory peak flow rate and compare said current peak flow rate to a previously determined historical peak flow rate, said spirometer comprising: (a) an air flow channel having a terminus adapted to receiving air blow by the individual; (b) a translucent flow rate measuring chamber in communication with the air flow channel with means to measure the individual's current expiratory peak flow rate, said means being a piston within the flow rate measuring chamber with an indicator operably associated therewith and wherein said piston is capable of movement in the flow rate measuring chamber in response to the air blow into the air flow channel; and (c) a holder having cylindrical-shaped wall mounted substantially perpendicularly on an outside wall of the air flow channel directly behind the flow rate measuring chamber, said holder having a rod rotatably positioned therewithin to frictionally engaged said cylindrical-shaped walls when manually rotated therein and a zone graph is on the rod so as to be in operable association with the flow rate measuring chamber, wherein the zone graph and the means to measure the current expiratory peak flow rate are movably adjustable with respect to one another, said zone graph having a series of zones to indicate the individual's personal state of lung function ranging from a danger zone to a fully normal zone wherein the individual's current expiratory peak flow rate is visually compared to the individual's historical expiratory peak flow rate to readily indicate the individual's relative personal state of lung function.