Inhaler dose counter

  • US 6,446,627 B1
  • Filed: 10/22/1999
  • Issued: 09/10/2002
  • Est. Priority Date: 12/20/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A dose counter for a metered dose inhaler, the counter comprising:

  • actuator means;

    rotary gear means having a wheel mounted on a spindle, said wheel having a plurality of ratchet teeth around a periphery of said wheel;

    drive means for driving said rotary gear means in step-wise fashion in response to displacement of said actuator means;

    reverse rotation prevention means to prevent reverse rotation of said rotary gear means;

    display means coupled to said rotary gear means, said display means having a visible array of incrementing integers on a surface thereof indexable by a single integer in response to each step of the step-wise motion of the rotary gear means; and

    a control surface to regulate a position of engagement and disengagement between said drive means and said wheel, wherein the reverse rotation prevention means is a friction clutch.

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