Patent ID: 8715245

Claim:
A medical hand-grip element for injection of a medicinal substance from an ampoule through an injection needle into human or animal tissue, the medical hand-grip element comprising: a housing, a drive device for rotatingly driving an ampoule and an injection needle relative to the housing, a delivery device configured for selective delivery of a medicinal substance from the ampoule and an antitwist coupling arrangement positioned at least partially within the housing and configured to maintain substantially the same rotational speed for the ampoule and for the injection needle relative to the housing, wherein the antitwist coupling arrangement comprises a connecting member arranged at least partially within the housing, wherein the connecting member comprises a hollow shaft which is configured to surround and accommodate within its interior at least a portion of the ampoule and to connect to the injection needle, wherein the hollow shaft of the connecting member comprises a gear wheel to connect to the drive device for rotatingly driving the ampoule and the injection needle, wherein the antitwist coupling arrangement comprises a first coupling element for transferring torque to the injection needle and a second coupling element to transfer torque from the connecting member to the ampoule, said first and second coupling elements being arranged at the hollow shaft of the connecting member, and wherein the antitwist coupling arrangement is configured to form a unit with the ampoule and the injection needle on which essentially the same torque acts and which thus rotates at essentially the same rotational speed, so that relative movement between the ampoule and the injection needle is substantially prevented.