Cartridge for applying medicament to an eye from a dispenser

Claim 1

A cartridge for use with a dispenser for applying medicament to an eye comprising: a housing having an anterior wall with an aperture therein, the housing having an open back end; a longitudinally slidable member contained within, said member having a flexible outwardly projecting extension which has a tip engaging an inner surface of the housing; a notch disposed on the inner surface of the housing having an anterior face and a posterior face which are angled to the housing and which cooperate with the extension tip such that the extension tip can be forced over the posterior face upon sliding the slidable member toward the anterior wall to a locked position where the tip engages the anterior face of the notch, but the tip cannot be forced over the anterior face upon sliding the member toward the back end of the housing from the locked position; and a trigger in the housing having an inner surface for engaging the flexible extension, said trigger being movable to a position where its inner surface forces the flexible extension tip in its locked position in a direction towards the slidable member and away from the inner surface of the housing so that the tip is free to move past the notch upon sliding of the slidable member away from the anterior wall.