Pen needle assembly for delivering drug solutions

摘要

In one aspect, a pen needle assembly is provided herein which includes a hub, and a needle fixed to the hub, the needle having proximal and distal ends with a lumen extending therebetween. The needle extends distally from the hub to define an exposed length between the distal end of the needle and the hub in the range of about 5.0 to 9.0 mm. The hub defines a post formed about the needle, the post having a distally-facing first skin engaging surface. The exposed length of the needle extends distally from the first skin engaging surface. The hub also defines a distally-facing second skin engaging surface which at least partially circumscribes the first skin engaging surface. The second skin engaging surface being located proximally of the first skin engaging surface. Advantageously, with the subject invention, a pen needle assembly is provided having two skin engaging surfaces which provide stability in achieving subcutaneous injections.

主权项

1. A pen needle assembly comprising:
a hub; and a needle fixed to said hub, said needle having proximal and distal ends with a lumen extending therebetween, said needle having a substantially uniform outer diameter; wherein said needle extends distally from said hub to define an exposed length between said distal end of said needle and said hub in the range of about 5.0 to 9.0 mm to facilitate a subcutaneous injection; wherein said hub defines a post formed about said needle, said post having a distally-facing first skin engaging surface, said exposed length of said needle extending distally from said first skin engaging surface; and wherein said hub defines an annular wall defining a radially facing surface and a distally-facing second skin engaging surface which at least partially circumscribes said first skin engaging surface, said second skin engaging surface being located at a fixed distance proximally of said first skin engaging surface; wherein said second skin engaging surface is continuous; wherein said second skin engaging surface is radially displaced from said first skin engaging surface; wherein said hub defines a cavity between said first skin engaging surface and said second skin engaging surface, the cavity comprising a distally facing surface located proximally of said second skin engaging surface; and a rigid shell; wherein the assembly further comprises at least one snap formed on one of the radially facing surface or the rigid shell, adapted to be received and retained in a snap recess formed in the other of the radially facing surface or the rigid shell.