| 主权项 |
1. A cassette unit for use with an auto-injector having an electrically powered drive unit, said cassette unit comprising:
a cassette unit housing defining a cassette unit housing cavity and a needle projection aperture; said cassette unit housing cavity arranged for receipt of a syringe comprising:
a barrel for containing a volume of a liquid drug formulation;a hollow needle at a front end of said barrel, said hollow needle defining a needle tip for dispensing of said liquid drug formulation; anda plunger that is axially movable within the barrel; and a removable cap that in a capping position fits over and thereby, acts such as to close off, the needle projection aperture of said cassette unit housing, the cassette unit housing being provided with one or more first engagement features arranged for reversibly engaging one or more second engagement features of said removable cap for reversible lock engagement of the removable cap to the cassette unit housing; and a shuttle lock control defining one or more blocking elements for selectively blocking movement of said one or more first engagement features relative to said one or more second engagement features, wherein said shuttle lock control is axially movable relative to the cassette unit housing between: (i) a first ‘cassette unused’ position, in which said one or more blocking elements block movement of the one or more first engagement features relative to the one or more second engagement features, thereby keeping the removable cap in locked relationship to the cassette unit housing; (ii) a second ‘cassette unlocked’ position, in which said one or more blocking elements no longer block movement of the one or more first engagement features relative to the one or more second engagement features, thereby allowing for unlocking of the removable cap from the cassette unit housing and for removal and replacement thereof; and (iii) after replacement of the removable cap, a third ‘cassette used’ position, locating intermediate said first and second positions, in which the one or more blocking elements again block movement of the one or more first engagement features relative to the one or more second engagement features, thereby restoring the locked relationship between the removable cap and the cassette unit housing. |
