Patent ID: 7438690
Filing Date: 2008-10-21
Classification: A61B

Abstract:
1. A peak expiratory flow meter capable of measuring continuous expiratory flow, comprising: a lower casing unit including a first body formed to have an open top and open opposite sides and to have a first end in which a first expiratory flow entrance is formed to be integrated with the first body so as to allow an asthma patient to hold the first expiratory flow entrance in his or her mouth, a plurality of rails arranged on a top of the first body adjacent to a second end of the first body, and a movable plate fitted on the rails; an air expansion unit including a pressure transfer tube arranged on a side of the first expiratory flow entrance, an elastic plate fitted on the pressure transfer tube, and a pressure spring comprised of a first end that is mounted to the elastic plate and a second end that is mounted on a first side surface of the movable plate; and an upper casing unit including a second body coupled with the first body, adapted to define the air expansion unit and provided with a first end in which a second expiratory flow entrance corresponding to the first expiratory flow entrance is formed to be integrated with the second body, and a measurement slot formed on a side of the second expiratory flow entrance and extended to a portion of the second body adjacent to a second end of the second body, and a scale indicator formed to have a “T” shape and to have an upper portion exposed to outside of the measurement slot and hung on a top of the second body and a lower portion supported on an upper portion of a second side surface of the movable plate, the scale indicator being moved by the movable plate.