EP2484395A2 — Device for delivering medicament

USPTO Abstract

A device (2,100) for delivery of predetermined doses of liquid medicament, which device is adapted to be in a medicament delivery state and in a medicament non-delivery state, said device is adapted to comprise; - a cartridge (10,103) adapted to contain the liquid medicament and a piston sealingly and slidably arranged in said cartridge; - an energy accumulating member (26;114) adapted to accumulate energy in terms of at least one predetermined step when the device is in the medicament non-delivery state; - an elongated threaded plunger rod (16,126) adapted to be arranged in the interior of the device; - a plunger rod driving member (40;47;128) engaged to the threaded plunger rod (16;126) and adapted to be in a driven state when the device is in the medicament delivery state and adapted to be in a non-driven state when the device is in the medicament non-delivery state, wherein the rotation of the plunger rod driving member (40;47;128) due to the output torque of energy accumulating member (26;114) drives the threaded plunger rod (16;126) and allows said rod which is in contact with the piston, to be driven towards the proximal end of the cartridge with a predetermined distance and expels a predetermined dose of the liquid medicament from the cartridge; wherein a bearing (41,46), coupled to or supported on an outer cover (55,48;108), is arranged and designed to effectively pick up forces acting on the proximal part of the device in the longitudinal direction thereof; whereby more of the accumulated energy that results from the stepwise rotational tensioning of the energy accumulating member (26;114) positioned at the distal end of the device, is brought to an efficient output torque.