Patent ID: 7819075
Filing Date: 2010-10-26
Classification: A61M,G06M

Abstract:
1. An inhaler counter comprising a ratchet wheel, a pawl and a display, the ratchet wheel and the pawl being arranged to transform a linear actuation motion into a rotational motion that advances the display by the pawl engaging a tooth of the ratchet wheel, the pawl and ratchet wheel arranged to effect disengagement of the pawl from the engaged tooth of the ratchet wheel by establishing abutment of the pawl and ratchet wheel at a lever point following the engaged tooth with respect to a direction of rotational motion of the ratchet wheel; wherein the lever point on the ratchet wheel is located on a tooth subsequent to the engaged tooth; and, wherein the subsequent tooth includes a straight back surface and the pawl includes a protrusion on a pawl counter surface that abuts the straight back surface to form the lever point.