Patent ID: 9649446
Date: 2017-05-16
CPC Classifications: A61M

Claim:
1. A medicament delivery device, comprising: a housing having a proximal end and a distal end; a hollow piston plunger within the housing; a telescopic dose drum between the housing and the piston plunger, wherein the dose drum is bidirectionally movable in relation to the housing and in relation to the piston plunger when setting a dose and delivering a dose; a piston plunger driver configured to drive the piston plunger toward the proximal end, comprising: a hollow drive drum sleeve movably arranged within the piston plunger and fixedly connected to the dose drum, wherein the drive drum sleeve and piston plunger are releasably coupleable to each other; a spinning element having a rod movably arranged within the drive drum sleeve, wherein the rod and drive drum sleeve are releasably coupleable to each other such that after a dose is set, axial movement of the spinning element toward the proximal end forces the rod and drive drum sleeve to couple, whereby the drive drum sleeve and piston plunger couple and the piston plunger and dose drum are displaced toward the proximal end for delivering the set dose, and such that after the set dose is delivered, axial movement of the spinning element toward the distal end forces the rod and drive drum sleeve to uncouple, whereby the drive drum sleeve and piston plunger uncouple; a stop body, wherein the stop body is connected to the piston plunger and to the dose drum such that the stop member is rotatable but not slidable in relation to the piston plunger and to the dose drum; and a stop member connected to the dose drum, wherein the stop member and stop body are configured to interact when the set dose equals a remaining dose in a medicament container such that rotation of the dose drum is inhibited.