Needle assembly for drug delivery devices

摘要

A needle assembly for a drug delivery device includes a cup-shaped receptacle of non-circular cross-section having a bottom section supporting a needle element. The needle element is adapted to penetrate a pierceable seal of a cartridge to be disposed in a cartridge holder of the drug delivery device. The receptacle includes a fastening mechanism adapted to engage with a fastening mechanism of a support section of the cartridge holder for releasably fastening the needle assembly. The fastening mechanisms are convertible into a release configuration by changing the distance between mutually corresponding fastening mechanisms through twisting the receptacle with respect to the support section.

主权项

1. A needle assembly for a drug delivery device comprising:
a cup-shaped receptacle having a bottom section supporting a needle element being adapted to penetrate a pierceable seal of a cartridge to be disposed in a cartridge holder of the drug delivery device, wherein the receptacle comprises a sidewall having an oval cross-section, the sidewall comprising two radially inwardly protruding latching elements adapted to engage with two radially outwardly extending ribs of a support section of the cartridge holder for releasably fastening the needle assembly to the cartridge holder, the support section of the cartridge holder comprising an oval cross-section smaller than the receptacle, wherein the ribs are arranged on opposite endpoints of a long axis of the oval cross-section of the support section, and the latching elements are arranged on opposite endpoints of a long axis of the oval cross-section of the sidewall, and wherein the latching elements and the ribs are convertible into a release configuration by changing a distance between the latching elements and the ribs through twisting the receptacle with respect to the support section.