| 主权项 |
1. 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 having a generally cylindrical interior surface surrounding a generally cylindrical hollow interior volume, the generally cylindrical interior surface having a central axis, an inner circumference, a first groove forming a generally spiral path around at least a portion of the inner circumference and a second groove extending in a generally linear path that is generally parallel to the central axis; and a moveable cam member supported for movement within the interior volume of the housing between a retracted position and an extended position, the cam member having an outer cam portion for extending into the first and second grooves and an inner cam portion disposed within the outer cam portion, the inner cam portion for supporting a needle for movement with the cam member between the retracted position and extended position, the outer cam portion being rotatably connected to the inner cam portion, to rotate relative to the inner cam portion; wherein, when the moveable cam member is in the retracted position, the moveable cam member is arranged relative to the generally cylindrical interior surface, to be selectively moved from the retracted position to the extended position, in a rotary direction around the central axis and simultaneously in a direction generally parallel to the central axis, while the outer cam portion follows the spiral path of the first groove; and wherein, when the moveable cam member is in the extended position, the moveable cam member is arranged relative to the generally cylindrical interior surface, to be moved from the extended position toward the retracted position, in a generally linear direction that is generally parallel to the central axis, while the outer cam portion follows the generally linear path of the second groove. |
