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Peak flow meter

  • US 5,627,324 A
  • Filed: 11/23/1994
  • Issued: 05/06/1997
  • Est. Priority Date: 11/17/1993
  • Status: Expired due to Term
First Claim
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1. A peak flow meter comprising an elongated body having a longitudinal direction and a predetermined cross sectional shape, said body having an open entering end and an open exit end, a piston and an indicator, means for mounting said piston in said body for longitudinal movement thereof upon exhalation into said open entering end, means for mounting said indicator in said body for engagement by said piston for movement by said piston longitudinally of said body, said indicator staying in the position to which it has been moved by said piston, means for retracting said piston independently of said indicator, a mass longitudinally movable in said body for returning said indicator independently of said piston, and means along said body against which the position of said indicator can be read.

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