Patent ID: 9687609
Date: 2017-06-27
CPC Classifications: A61K,A61M,F16K,Y10T

Claim:
1. A pen-type drug injection device comprising: a housing having a longitudinal axis and a recess with a side wall comprising at least two protrusions circumferentially spaced apart from each other and extending longitudinally, where each protrusion is deformable from a non-deformed shape to a deformed shape, where the non-deformed shape has longitudinal profile defined by a radial distance (R) measured relative to the side wall and perpendicular to the longitudinal axis; and a plug, wherein the plug is mechanically coupled within the recess by a force fit contact with a section of the longitudinal profile of the non-deformed shape to transform each protrusion to the deformed shape such that R is decreased in the section of the longitudinal profile that is in the force fit contact with the plug, where a friction force is caused by a deformation of the protrusion when the plug is coupled to the housing.