Patent ID: 7682338
Filing Date: 2010-03-23
Classification: A61M,Y10T

Abstract:
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 base structure for arranging adjacent a user's skin; a moveable carriage for supporting a hollow cannula for movement between a retracted position and an extended position; at least one pivotal arm supported on the moveable carriage for pivotal motion relative to the base, between a first pivot position and a second pivot position; a moveable needle supported by the base structure for movement between a retracted position and an extended position, the moveable needle having a shaft, the needle shaft having a piercing end for piercing the user's skin when the base structure is arranged adjacent the user's skin and the moveable needle is moved to the extended position, wherein the needle shaft has a sufficient length to extend through the cannula to extend the piercing end of the needle out one end of the cannula and move with the cannula between the retracted position and the extended position; a first spring arranged to provide a first bias force at least when the needle is in the retracted position, the first bias force directed to bias the needle toward the extended position; a second spring arranged to be held in a compressed state by the at least one pivotal arm, when the at least one pivotal arm is in the first pivot position and the moveable needle is moved to the extended position and, from that state, to be released to expand toward its natural state of uncompression upon the at least one pivotal arm moving to the second pivot position; wherein, when (i) the base structure is arranged adjacent the user's skin, (ii) the moveable needle and cannula are in the extended position and (iii) the second spring is released from its compressed state and expands toward its natural state of uncompression, a second bias force is provided on the needle by the second spring to move the needle from an extended position to a retracted position, while leaving the cannula in the user's skin.