Extended hub for a safety pen needle

摘要

A shielded pen needle assembly is provided in which the hub (36) extends distally beyond an outer sleeve (18) of the assembly. The pen needle assembly comprises:
a hub (36) adapted to receive a medication pen body having a medication compartment therein;
a needle cannula (14) affixed to the hub (36) having a distal end extending from the distal end of the hub (36) and a proximal end adapted to access the medication compartment in the pen body;
a first passive shield (44) arranged on the hub (36) and encircling the needle cannula (14);
a biasing member (94) biasing the first passive shield (44) to a distal position covering the needle cannula (14) after injection;
an outer sleeve (18) attached to the hub (36) having a distal end encircling the first passive shield (44) and the hub (36);
wherein the distal end of the hub (36) is located distally of the distal end of the outer sleeve (18), and the distance between the distal tip of the needle (14) and the distal end of the hub (36) is the effective penetration depth of the needle (14).