Patent ID: 8945050
Filing Date: 2015-02-03
Classification: A61M

Abstract:
1. A pen needle assembly, comprising: an outer shell having a first end configured to engage the skin of a patient and a second end; an inner shell disposed within said outer shell and engageable with a drug delivery device, said inner shell being slidable within said outer shell and having a first end and a second end, a hub movably disposed within said outer shell and being movable relative to said outer shell and inner shell; a needle rigidly fixed to said hub; an adhesive layer disposed on said hub; a first spring coupled to said outer shell and to said inner shell to retract said inner shell toward said second end of said outer shell; a second spring extending between said inner shell and hub to bias said hub away from said first end of said inner shell; wherein said hub and inner shell move downwardly relative to said outer shell during an injection to adhere said adhesive layer on a patient's skin and move upwardly relative to said outer shell to raise the patient's skin to facilitate the injection.