Device for the dosed administration of a fluid product, adapted for the replacement of a container

A device for administering a fluid product, said device including:

• a first casing part comprising a reservoir for the product;
• a second casing part detachably connected to the first casing part;
• a linear guide fixedly positioned within the first casing;
• a piston rod for exerting a linear delivery movement from the second casing part, the piston rod linearly guided and rotationally secured by the linear guide;
• a drive member adapted for linear drive motion which can be operated for linearly moving the piston rod;
• a coupler assembly adapted to couple the drive member to the piston rod in a coupler engagement, the coupler assembly further adapted to transfer the linear drive motion of the drive member into a rotational coupler assembly motion, the rotational coupler assembly motion causing the linear delivery movement of the piston rod;
• and
• a decoupling member comprising a sleeve part movably connected to the second casing part and coupled to the first casing part wherein, when the casing parts are moved relative to each other to be detached, the decoupling member is moved into a decoupling position which prevents coupling of a first portion of the coupler assembly
• wherein the first portion of the coupler assembly is decoupled when the casing parts are initially connected, an initial actuation movement the drive member couples the first portion of the coupler assembly, and a further actuation movement of the drive member causes the coupler assembly to rotate thereby advancing the piston rod.

A device for administering a fluid product, the device comprising:

• a first casing part comprising a reservoir for the product;
• a second casing part detachably connected to the first casing part;
• a sleeve-shaped drive member linearly guided in the second casing part, the drive member having threads disposed on a shell outer area;
• a coupler input member threadably engaged with the drive member, the coupler input member adapted to travel linearly between a coupled position and a decoupled position and further adapted for rotational movement within the second casing;
• a piston rod having an outer thread over an axial length thereof;
• a coupler output member with an inner thread corresponding to the piston rod outer thread, the coupler out member adapted for direct or indirect coupling to the coupler input member and for receiving the piston rod, the coupler output member further adapted for rotational movement within the second casing when coupled to the coupler input member thereby advancing the piston rod;
• a decoupling member adapted for linear displacement in the second casing part and further rotationally secured to the second casing when the first and second casings are connected;
• and
• a restoring member adapted to bias the coupler input member counter to an advancing direction and toward a decoupled position;
• wherein, in the coupled position the coupler input member is directly or indirectly rotationally coupled to the coupler output member, the coupler output member being decoupled from the decoupling member;
• wherein, in the decoupled position, the coupler input member is rotationally decoupled from the coupler output member;
• and
• wherein, the decoupling member is further adapted to maintain the decoupled position and further be decoupled from the output member when the first and second casing members are detached.