A therapeutic product delivery device is described which comprises a device body and a cartridge for holding a therapeutic product. An engagement structure is provided for releasably engaging the cartridge with the device body. A fault detector is provided for detecting a fault in the delivery of the therapeutic product from the cartridge. A release trigger is responsive to the detection of a fault to cause the engagement structure to release the cartridge from the device body. In this way, a fault causes the cartridge to be released from the device body, which will prevent any further delivery of the therapeutic product to the patient. This solution is strongly preferable to a solution in which a product delivery mechanism (e.g. a pump) is merely paused or stopped, since when the cartridge separates then no further delivery is possible at all, until the cartridge is reattached (or more probably replaced with a new cartridge in case the fault is with the cartridge).本發明係揭露一種治療產品輸送裝置，其係包含一裝置本體、一藥筒、一嚙合結構、一錯誤偵測器與一釋放觸發器。藥筒持有一治療產品，嚙合結構釋放性地嚙合藥筒與裝置本體，在治療產品從藥筒中傳輸時，錯誤偵測器偵測一錯誤。釋放觸發器對一錯誤之偵測發生反應，以造成嚙合結構將藥筒從裝置本體中釋放。在此方法中，一錯誤造成藥筒從裝置本體中釋放，以防止治療產品傳輸到病人中。較佳的解決方式為產品傳輸機制（例如幫浦）只有暫停或停止，因為當藥筒分離時，不會有任何傳輸，直到藥筒再次安裝上為止（當原藥筒有錯誤，以一新藥筒取代）。
