Patent ID: 8486018

Claim:
A needle injector device for connection in fluid-flow communication with the inlet or outlet port of a reservoir, the needle injector comprising: a housing provided with an interior channel having a longitudinal, axial dimension and a slot-shaped opening extending through a wall of the housing to the channel and extending along at least a portion of the longitudinal length of the channel; a hollow needle supported in the channel for movement relative to the housing between a start position, an extended position and a retracted position, the needle having a piercing end having an opening and an opposite, second end having an opening; a fluid conduit connected to the opening on the second end of the hollow needle and moveable with the hollow needle, the fluid conduit being connectable to the outlet or inlet port of the reservoir; a cannula having a nest supported on the needle, when the needle is in the start position and moveable with the needle to the extended position of the needle; a lever member connected in a fixed relation to the hollow needle and having a extension portion extending through the slot-shaped opening in the housing; a first bias member arranged to impart a first bias force on the lever in a first direction, for moving the lever and the attached needle and the supported cannula from the start position to the extended position of the needle, free of manual input; a lock structure for locking the cannula and nest in a fixed position relative to the housing, when the needle and cannula are moved to the extended position of the needle; a second bias member arranged to impart a second bias force on the lever in a second direction, opposite to the first direction, for moving the lever and the attached needle from the extended position to the retracted position, while leaving the cannula in the extended position; wherein at least a portion of the first bias member is located outside the housing, and wherein at least a portion of the second bias member is located outside the housing.