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Cannula gas flow meter

  • US 20070221223A1
  • Filed: 09/14/2006
  • Published: 09/27/2007
  • Est. Priority Date: 03/10/2006
  • Status: Abandoned Application
First Claim
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1. An apparatus for metering gas flow to a facemask or cannula from a pressurized gas supply, comprising:

  • a body having a first end and a second end and body sidewall communicating therebetween;

    a central cavity extending axially between said body sidewall and said first and second ends, said cental cavity having a diameter;

    an intake conduit communicating from a first aperture, through said first end, to a second aperture communicating with said central cavity;

    an exhaust conduit communicating through said second end to said central cavity;

    means for sealed communication of said intake conduit with a pressurized gas supply;

    said exhaust conduit adapted for sealed engagement with a cannula or face mask;

    a piston having a side surface extending between a first end and an endwall, said-endwall having a surface area;

    said piston dimensioned for translatable engagement in said central cavity;

    said endwall positioned closest to said intake conduit when in said translatable engagement;

    means to impart a biasing force to said piston to translate said piston toward said intake conduit to a biased position;

    said intake conduit having a narrowing diameter extending from a widest point at said first aperture, to a narrowest point at said second aperture;

    said narrowing diameter providing a means to focus said pressurized gas supply communicated from said second aperture, in a gas stream communicating substantially with a central portion of said surface area of said endwall;

    said gas stream communicating with said central portion thereby providing a translating force sufficient to overcome said biasing force and translate said piston to an operating position a distance toward said exhaust conduit from said biased position;

    said piston viewable through a substantially transparent section of said sidewall of said body, when translated to said operating position; and

    said piston, when viewable, providing means to visually confirm communication of said pressurized gas supply from said intake conduit, to said exhaust conduit.

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