The invention relates to a device for injecting a pharmaceutical, in particular insulin, into the human or animal body with the aid of a motor-driven pump head which can be exchanged easily and quickly.本發明有關一種利用馬達驅動的泵頭(其可簡易並且快速地被更換)以將一醫藥品(尤其是胰島素)注入人類或動物體的裝置。