APPARATUS FOR INJECTIONS WITH DOSE SETTING RESTRICTOR Russian patent published in 2005 - IPC

FIELD: medicine, in particular, mechanism preventing setting of dose exceeding amount of liquid remaining in cartridge of injection apparatus.

SUBSTANCE: apparatus has dose setting member, which may be joined with drive member so that it can rotate in one direction without rotation of drive member. Dose is introduced by rotating of dose setting member in reverse direction, with dose setting member providing rotation of drive member in conjunction therewith. Rotation of drive member causes advancement of piston rod inside cartridge and replacement of liquid contained in cartridge. Drive member is equipped with race having length dependent upon total amount of liquid in cartridge and driven into engagement with fallowing member connected to dose setting member for fallowing rotation of said member. When fallowing member reaches end of race, dose setting member may not be further rotated.

EFFECT: increased efficiency by preventing setting of dose exceeding amount of liquid remaining in cartridge.

4 cl, 3 dwg