Patent ID: 9616175
Date: 2017-04-11
CPC Classifications: A61M

Claim:
1. A medical injection device comprising: a housing; a variable volume reservoir containing a liquid drug and comprising an outlet and a movable wall; an injection mechanism operable to inject a dose of the liquid drug and comprising an actuation member adapted to displace the movable wall in a first direction; and a coupling mechanism, wherein the injection device is configured to prevent a movement of the actuation member in a second direction substantially opposite the first direction in response to a subjection of the actuation member to a first force being of a magnitude which is smaller than a threshold value and to allow a reversible movement of the actuation member in the second direction in response to a subjection of the actuation member to a second force from the reservoir acting on the actuation member via the movable wall, the second force being of a magnitude which is equal to or greater than the threshold value.