Patent ID: 8439864

Claim:
An administering device for administering an agent from a multi-chamber carpule with at least a first chamber containing a solid agent and a second chamber containing a dissolving liquid for the agent, the administering device having a proximal end and a distal end and comprising a housing and a mixing mechanism for mixing the agent and dissolving liquid ,wherein the mixing mechanism comprises a holder element for accommodating the carpule, the holder element rotatably moveable relative to the housing for being inserted into the housing and for mixing the agent and dissolving liquid the multi-chamber carpule fixed relative to the holder element during mixing, the administering device further comprising a display system comprising at least a first visual display for indicating a position of the multi-chamber carpule relative to the housing when a mixing operation has ended, at least a second visual display for indicating a position of the carpule relative to the housing when a priming operation has ended, and a catch mechanism for forming a releaseable catch position between the holder element and the housing which permits rotating the holder element to move the holder element in the proximal direction relative to the housing and non-releasable catch positions between the holder element and the housing which prevent the holder element from moving in the proximal direction relative to the housing, wherein the catch mechanism is for latching and providing an indication of individual steps involved in preparing the administering device for use, and comprises a first catch groove, a second catch groove or orifice, a third catch groove, and a catch arm on the holder element oriented in the circumferential direction of the holder element and biased radially outwardly so the arm slides along an internal circumferential surface of the housing when the holder element is rotated into the housing, wherein the holder element is rotated into the housing until the catch arm latches in the first catch groove generating an acoustic signal indicating an initial position has been reached, the initial position constituting a lock preventing the holder element from moving in the proximal direction relative to the housing and from which initial position the holder element is rotated farther in until the arm latches in the second catch groove or orifice reaching a mixing position, generating an acoustic signal indicating the end of mixing of the agent and dissolving liquid and constituting a releasable lock wherein by the holder element can be moved in the proximal direction relative to the housing or can be rotated farther into the housing until the catch arm is latched in the third catch groove generating an acoustic signal indicating an priming position has been reached reaching and constituting an anti-rotation lock so that the holder element is locked in the priming position to prevent any further movement relative to the housing.