The present invention generally includes a first threaded member (50, 50 ') and a second threaded member (40, 60') having a longitudinal axis and a thread (61), wherein the thread And a second threaded member having at least two consecutive portions (62, 63, 64) with different leads. The first threaded member (50, 50 ') and the second threaded member (40, 60') are the lengths of the second threaded member (40, 60 ') during operation during assembly dose setting. Applied and arranged to rotate relative to each other about a directional axis, whereby the first threaded member (50, 50 ′) and the first threaded member (50, 50 ′) and the thread ( 61) by mechanical cooperation with the second threaded member (40, 60 ') from the start position to the end position along the second threaded member (40, 60'). On the other hand, it is displaced in the axial direction. According to the invention, the fast part (62, 64) of the thread (61) having a larger lead than the slow part (63) of the thread (61) comprises a multi-thread thread, The low speed portion (63) includes fewer stripes than the high speed portions (62, 64). The present invention is further directed to a drug delivery device for setting and dispensing several user variable doses of medication, including such assemblies.本発明は、一般に、第１のねじ付部材（５０、５０’）と、長手方向軸およびねじ山（６１）を有する第２のねじ付部材（４０、６０’）であって、該ねじ山が異なるリードを持つ少なくとも２つの連続した部分（６２、６３、６４）を有する第２のねじ付部材とを含む、薬物送達デバイス用のアセンブリを対象とする。第１のねじ付部材（５０、５０’）および第２のねじ付部材（４０、６０’）は、アセンブリの用量設定中動作中に、第２のねじ付部材（４０、６０’）の長手方向軸の周りで互いに対して回転するように適用され配置され、これにより、第１のねじ付部材（５０、５０’）は、第１のねじ付部材（５０、５０’）とねじ山（６１）との機械的協働により、第２のねじ付部材（４０、６０’）に沿って始端（ｓｔａｒｔ）位置から終端（ｅｎｄ）位置へ第２のねじ付部材（４０、６０’）に対して軸方向に変位する。本発明によれば、ねじ山（６１）の低速（ｓｌｏｗ）部分（６３）よりも大きいリードを有するねじ山（６１）の高速（ｆａｓｔ）部分（６２、６４）は多条ねじ山を含み、低速部分（６３）は高速部分（６２、６４）よりも少ない条を含む。本発明は、さらに、そのようなアセンブリを含む、薬剤のいくつかのユーザ可変用量を設定し投薬するための薬物送達デバイスを対象とする。
