| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection device which is capable of resisting temperatures below the freezing point of a contained drug, i.e., which is not damaged and rendered useless as a result of the drug expanding in a reservoir.SOLUTION: An injection device 100 is capable of resisting proximal movements of a piston rod 107, relative to a housing 102, when the piston rod is subjected to proximally directed forces below a threshold magnitude, and capable of allowing reversible proximal movements of the piston rod relative to the housing, when the piston rod is subjected to proximally directed forces of or above the threshold magnitude. |
