| 摘要 |
A medication cartridge piston of a cartridge for an injection device. In one form, the piston includes a body (32) formed of a first material and including an interior hollow with a rearward facing mouth allowing for insertion of a drive member of the injection device. The body includes a first portion and a second portion disposed rearwared of the first portion, a sealing gland (34) secured to the body and formed of a material that is less rigid than the first material, the sealing gland ringing at least an axial segment of the second portion and having at least one exterior periphery region for sealingly engaging an interior surface of the cartridge barrel, and the body first portion including a thrust surface (4S) within the interior hollow for direct abutment by the drive member, at least a portion of the thrust surface disposed forward of a forward edge of a forwardmost sealing gland exterior periphery region of the at least one exterior periphery region. This piston can be operatively pulled by the drive member in a forward direction within the cartridge barrel to dispense medication from the cartridge. In an alternate embodiment, a piston is provided which is adapted for use with different drive members of injection devices.
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