The present invention relates to a limiter mechanism which is suitable for an injection device, especially a pen type drug delivery device. The mechanism comprises a housing (10, 30, 40； 40'), a dose setting member (50), which during dose setting rotates relative to the housing (10, 30, 40； 40') in a first direction and which during dose dispensing rotates relative to the housing (10, 30, 40； 40') in a second opposite direction, and a limiting element (60) limiting the rotational movement of the dose setting member between a zero dose position and a maximum dose position. The limiting element (60) is movable on a first path rotationally constrained but axially displaceable relative to one of the housing (10, 30, 40； 40') or the dose setting member (50) and is movable on a second, helical path (53) relative to the other of the housing (10, 30, 40； 40') or the dose setting member (50). At least one of the first path and the second path (53) has an end stop (54, 55) limiting the relative movement of the limiting element (60).本發明係有關於一種適用於注射裝置的限制機構，特別是筆型藥物傳送裝置。該機構包括殼體(10，30，40；40')，在劑量設定期間對於該殼體(10，30，40；40')在第一方向旋轉以及在劑量分配期間對於該殼體(10，30，40；40')在第二相反方向旋轉的劑量設定構件(50)，以及限制該劑量設定構件在零劑量位置與最大劑量位置之間旋轉運動的限制元件(60)。該限制元件(60)可在第一路徑對於該殼體(10，30，40；40')或該劑量設定構件(50)中之一者旋轉受拘束但是可軸向位移地移動以及可在第二螺旋形路徑(53)上對於該殼體(10，30，40；40')或該劑量設定構件(50)中之另一者移動。該第一路徑與該第二路徑(53)中之至少一者有限制該限制元件(60)之相對運動的一末端擋止件(54，55)。
