Device for dispensing drops of small volume, in particular for ophthalmological care

A device for dispensing drops of small volume, the device comprising a pump and a container of substance to be dispensed, said pump comprising:

• a hollow pump body extending between a first end close to the container and a second end closed by an end wall which is pierced by a central opening, said pump body including a passage between its inside and the container;
• and
• a piston sliding inside said pump body in sealing contact with said pump body around a circular periphery having a first diameter D2, thereby isolating the container from a pump chamber inside the pump body, said piston being slidable towards the container to a position in which it puts said pump chamber into communication with the container via said passage;
• wherein the pump further includes:
• a push rod including a central channel in which a valve seat is formed, said push rod sliding through said central opening in the end wall of the pump body, and said push rod being in contact with the pump body around a circular periphery having a second diameter D1 that is smaller than said first diameter D2;
• pusher means for displacing said push rod within said pump body toward said container;
• a punch secured to the piston and extending along said central channel of the push rod and being suitable for bearing in sealed manner against the valve seat;
• a support secured to the pump body and disposed at the end thereof adjacent to the container;
• and
• resilient bearing against the support means and urging the piston towards the end wall of the pump body.