Patent ID: 9205197
Filing Date: 2015-12-08
Classification: A61M

Abstract:
1. A drug delivery device, said device comprising: a drug delivery device housing; a medicament contained in said drug delivery device housing; a dose dial sleeve comprising a scale arrangement that is provided for setting a dose, said dose dial sleeve positioned radially inward of said drug delivery device housing and in threaded engagement with said drug delivery device housing; a piston rod comprising a first end and a second end, a first helical groove extending from the first end allowing a helical movement of the piston rod with respect to the housing, and a second helical groove extending from the second end and having a same lead as a threaded engagement of the dose dial sleeve with the housing; and a drive sleeve comprising a helical groove engaging the second helical groove of the piston rod, the drive sleeve being prevented from rotating with respect to the housing during drug delivery; a dose dial sleeve comprising a scale arrangement that is provided for setting a dose, said dose dial sleeve positioned radially inward of said drug delivery device housing and in threaded engagement with said drug delivery device housing, the dose dial sleeve and the drive sleeve being releasably rotationally locked to one another for dialing a dose; said dose dial sleeve rotatable out of said drug delivery device housing so that said scale arrangement is rotated to set a dose of said medicament contained in said drug delivery device; wherein said dose may be increased by turning said dose dial sleeve in a direction clockwise in relation to a longitudinal axis of the drug delivery device when viewed from a position looking from a proximal end of the drug delivery device to a distal end of the drug delivery device along the longitudinal axis; wherein said scale arrangement comprises a plurality of numerical values representative of said dose, the plurality of numerical values being helically arranged, wherein said plurality of numerical values increase from a minimum value near a proximal end of said dose dial sleeve to a maximum value near a distal end of said dose dial sleeve, wherein, when a user reads said plurality of numerical values from left to right along a surface of said dose dial sleeve from said proximal end of said dose dial sleeve to said distal end of said dose dial sleeve, said plurality of numerical values increase, are in a normal vertically readable orientation and are not inverted, wherein said plurality of numerical values increase when said dose dial sleeve is turned in the clockwise direction; wherein said dose dial sleeve translates out of said drug delivery device housing during a dose setting operation; and wherein said dose dial sleeve translates back into said drug delivery device housing during dose administration.