Improvements in and relating to devices suitable for use in drug delivery of drive mechanisms

摘要

An actuator for use in a drug delivery device (1), comprising mechanism: a casing (3, 7) having a proximal end and a distal end; an actuator member (14) positioned within said envelope (3, 7) so that said drive member (14) longitudinally esmóvil is not rotatable relative to said housing (3, 7); a piston rod (10) which is not rotatable relative to said housing (3, 7) and is adapted so that funcionea through the casing (3, 7) and transfer a force in the longitudinal direction to the distal end of dispositivode drug delivery (1); rotating means (13) engaged releasably with said plunger rod (10) and engaged to said miembroaccionador (14) and engaged with said casing (3, 7), wherein the rotating means (13) is selected from the group of (i) to (iii), (i) a slide plate (28) with arms of catch (29) and a gear (27), (ii) a slide plate (28) with arms of catch (29) and a lever (427), (iii) a lever assembly; characterized in that, a) when said drive member (14) moves proximally with respect to said casing (3, 7), rotating dichomedio (13) moves proximally with respect to said plunger rod (10); b) when said drive member (14) is moved distally, said rotating means (13) moves distal20mente moving said piston rod (10) towards the distal end of the device.