US Patent 10029042 User-actuated storage assembly for injection device

A storage assembly is removably connectable to a drug delivery device. A first chamber is disposed in the housing. A plurality of penetrating members are stored in the first chamber. A second chamber is disposed in the housing for storing the plurality of penetrating members after being used in an injection. A transfer drum disposed in the housing transfers one of the penetrating members from the first chamber to an injection position and from the injection position to the second chamber following an injection.