A medicament delivery device wherein a drive mechanism comprises a first resilient member 91 and a delay plunger rod assembly； wherein the delay plunger rod assembly comprises a proximal plunger 96, a distal plunger 90, a chamber 95 formed between the proximal and the distal plungers, an aperture, and delay means contained within the chamber； the distal plunger being positioned and configured in relation to a hold and release mechanism such that, as the drive mechanism exerts a pressure on the medicament container, the distal plunger acts against the delay means whereby a release of a signal generating member is delayed after the release of the drive mechanism to allow remaining contents of medicament in a medicament container to be completely expelled before the signal generating member is released. (Fig 7.)一藥物輸送裝置，其中驅動機構包括第一彈性構件(91)及延遲柱塞桿組合體；其中該延遲柱塞桿組合體包括近側柱塞(96)、遠側柱塞(90)、一形成於該近側柱塞及該遠側柱塞間之室(95)、孔口、及包含在該室內的延遲機制；該遠側柱塞關於一固持及釋放機構被定位及建構，使得當該驅動機構在該藥物容器上施加一壓力時，該遠側柱塞作用抵靠著該延遲機制，藉此在該驅動機構的釋放之後，信號產生構件之釋放被延遲，以允許藥物容器中之藥物的剩餘含量在釋放該信號產生構件之前被完全地排出。
