Importance

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Abstract

An inhalation device for indicating inhalation flow rate and the passage of time between inhalations, including a vertical cylindrical chamber having a lower first closed end with a first one-way valve for allowing gas flow into said chamber, an upper second closed end, an outlet proximate said upper closed end for inhalation, the interior surface of the sidewalls of said chamber defining an inside horizontal cross sectional area substantially constant from said first closed end to an area intermediate said first closed end and said second closed end, said chamber sidewalls further defining a gradually increasing horizontal cross sectional area from said intermediate area to said second closed end. Disposed vertically within said vertical chamber and concentrically aligned therewith is a tubular member with a plurality of openings proximate said upper closed end, said tubular member being in communication with an inhalation exhalation outlet and a second one-way valve for exhalation. Said device further includes a horizontal indicator disc disposed within said chamber having a horizontal cross sectional area slightly less than said substantially constant horizontal cross sectional area of said chamber, said indicator disc guided vertically within said chamber by means of said tubular member.

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First Claim