Piston washer for drug delivery device and drug delivery device incorporating such piston washer

摘要

The present invention is used in a drug delivery device to transmit a distal axial force from a piston rod (107, 207) to a piston (199, 299) of a cartridge (189, 289) retained. The present invention relates to the piston washer (109, 209). A piston washer (109, 209) is associated with the proximal surface portion (109a) configured to engage the distal portion of the piston rod (107, 207) of the drug delivery device and the piston (199, 299). A distal surface portion (109b) configured to mate and abut. The axial distance defining devices (19a1, 109b1, 109c, 209c) are positioned between the proximal surface portion (109a) and the distal surface portion (109b), and the axial distance defining devices (19a1, 109b1, 109c, 209c) is configured to transition from a first axially compressed state to a second axially uncompressed state. The invention further relates to a drug delivery device incorporating such a piston washer (109, 209). [Selection] Figure 4a