| 摘要 |
An injection device (1) for delivering a predetermined fixed dose of liquid drug, the device (1) comprising a base member, preferably a housing (2), a first tubular member (7) and a second tubular member (10). The first tubular member (7) and the base member are engaged via a first track (8) and a first protruding part (9), and the first tubular member (7) and the second tubular member (10) are engaged via a second track (11) and a second protruding part (12). The first track (8) comprises a first portion (8a) which the first protruding part (9) travels during setting of the predetermined fixed dose, and the second track (11) comprises a first portion (11a) which the second protruding part (12) travels during setting of the predetermined fixed dose. The first portions (8a, 11a) of the first (8) and second (11) tracks are shaped in such a manner that, during setting of the predetermined fixed dose, angular and axial movements of the first tubular member (7) relative to the base member correspond to angular and axial movements of the first tubular member (7) relative to the second tubular member (10). Thereby the second tubular member (10) is prevented from rotating during setting of a dose. The second tubular member (10) is rotationally locked to a piston rod (13), and rotation of the piston rod (13) during dose setting is thereby prevented in an easy manner and without the requirement of a clutch arrangement. |
