| 摘要 |
Apparatus is described for administering a substance to a subject. A vial (22) contains the substance and a stopper (24) is disposed within the vial and is slidably coupled to the vial. A first threaded element (26) is (a) rotatable with respect to the vial and (b) substantially immobile proximally with respect to the vial during rotation of the first threaded element. A second threaded element (28) is threadedly coupled to the first threaded element. At least a distal end of the second threaded element is substantially non-rotatable with respect to the vial, and the distal end of the second threaded element defines a coupling portion (30) that couples the second threaded element to the stopper. The first threaded element, by rotating, linearly advances the stopper and at least the distal end of the second threaded element toward a distal end (36) of the vial. Other embodiments are also described. |
