Patent ID: 7988678
Filing Date: 2011-08-02
Classification: A61M

Abstract:
1. A needle mounting assembly for mounting a pen needle in fluid communication with a medication cartridge including an outlet end with a septum, the needle mounting assembly comprising: a collet defining an opening in which is slidably fittable the outlet end of the cartridge, said collet shiftable relative to the cartridge outlet end between a first axial position and a second axial position, said collet including a base and a plurality of fingers that are forward of said base; a stop collar disposed at a fixed axial location on one of the cartridge and a retainer for the cartridge, said stop collar adapted to halt movement of said collet at said first axial position when said collet moves from said second axial position; wherein when said collet is disposed in said first axial position, said plurality of fingers extend forward of the cartridge outlet end and are disposed in a first radial arrangement in which a needle hub of the pen needle can be freely axially placed onto and freely axially removed from the plurality of fingers; wherein when said collet is moved to said second position from said first position when the needle hub is freely placed onto the plurality of fingers, said plurality of fingers are shifted by engagement with the cartridge outlet end to a second radial arrangement to operationally secure the needle hub for medication delivery with a tip of a cannula of the pen needle piercing the cartridge septum; wherein when said collet at said second position with the needle hub operationally secured by said plurality of fingers is moved to said first position, the tip of the cannula of the pen needle is withdrawn from the cartridge septum and said plurality of fingers shift back to said first radial arrangement for free axial removal of the needle hub from the mounting assembly; and wherein each of said plurality of fingers includes an outer radial periphery for engagement with an internal threading of the needle hub.