Injector device and method for its operation

Injector device for containers of syringe type, comprising a barrel of axially roughly constant cross-section, a front opening and at least one movable wall inserted in the barrel for displacement of a container content, the injector comprising a) housing part arranged to receive the container at least axially stationary, B) an integral or composite piston rod arrangement operable to displace the container movable wall at least in the forward direction and c) a track system for controlling or sequencing the piston rod movements, the track system comprising at least one cooperating track and follower, the cooperating track and follower being arranged stationary with respect to the housing and the piston rod respectively, or vice versa, and in cooperation aallowing at least one forward for the piston rod, characterized in the important comprising

• that the track system comprises an initial track allowing forward movement of the piston rod, at least a section of the initial track comprising a screw-threaded tradk, and
• that the track system further comprises at least one expelling track having at least a first axial section and a second axial section connected by a transveral section.

Injector device for containers of syringe type, comprising a barrel of axially roughly constant cross-section, a front opening and at least one movable wall inserted in the barrel for displacement of a container content, the injector comprising a) a housing or housing part arranged to receive the container at least axially stationary, b) an integral or composite piston rod arrangement operable to displace the container movable wall at least in the forward direction and c) a track system for controlling or sequencing the piston rod movements, the track system comprising at least one cooperating track and follower, the cooperating track and follower being arranged stationary with respect to the housing and the piston rod respectively, or vice versa, and in cooperation allowing at least one forward for the piston rod, characterized in the improvement comprising

• that the track system comprises an initial track allowing forward movement of the piston rod,
• that the track system further comprises at least one expelling track having at least one axial section allowing forward movement of the piston rod, and
• that different followers are arranged for the initial track and the expelling track.

Injector device for containers of syringe type, comprising a barrel of axially roughly constant cross-section, a front opening and at least one moveable wall inserted in the barrel for displacement of a container content, the injector comprising a) a housing or housing part arranged to recieve the container at least axially stationary, b) an integral or composite piston rod arrangement operable to displace the container movable wall at least in the forward direction and c) a track system for controlling or sequencing the piston rod movements, the track system comprising at least one cooperating track and follower, the cooperating track and follower being arranged stationary with respect to the housing and the piston rod respectively, or vice versa, and in cooperation allowing at least one forward for the piston rod, characterized in the improvement comprising

• that the plunger rod comprises a penetrating part arranged to penetrate into the container barrel and an extended part at least partially arranged in parallel with the penetrating part to accommodate the at least part of the barrel therebetween and
• that at least one track is arranged on the extended part.

A method for operating an injector device for containers of syringe type, comprising a barrel of axially roughly constant cross-section, a front opening and at least one movable wall inserted in the barrel for displacement of a container content, the injector comprising a housing or housing part arranged to receive the container at least axially stationary, and an integral or composite piston rod arrangement operable to displace the container movable wall at least in the forward direction and, characterized in the steps of

• a) displacing the piston rod forwards in a movement having at least a component in the axial direction, performing hereunder de-aeration of the container content,
• b) rotating the piston rod in a direction different from that of step a), and
• c) advancing the piston rod forwards in a movement having at least a component in the axial direction, performing hereunder ejection of container content.