An injector for the injection of a fluid into human or animal bodies with a pump for the conveying of the fluid at a flow rate, and with a control device for the control of the pump and for the setting of a desired flow rate (theoretical flow) of the fluid, and a pressure measurement device coupled with the control device for the recording of the pressure of the fluid conveyed by the pump, wherein a theoretical pressure is specified for the control device. In order, on the one hand, to reliably prevent an exceeding of a pressure hazard in the injection system and, on the other hand, to avoid an unnecessary prolongation of the injection process by a power reduction or a switching off of the drive mechanism, and to increase the throughput of several injection processes carried out with the injector one after the other, provision is made so that the control device compares the pressure of the fluid recorded by the pressure measurement device to the theoretical pressure, and when the theoretical pressure is exceeded over a time period, integrates the chronological pressure course of the pressure recorded by the pressure device over this time period for the determination of a pressure integral, and switches off the pump or operates it with a lower pump power if the determined pressure integral exceeds a prespecified integral limiting value.本發明涉及一種用於注射液體到人或動物的身體中的注射器，具有以流率輸送液體的泵、控制泵並設定液體的期望的流率的控制裝置和與控制裝置聯接的、檢測泵輸送的液體壓力的壓力測量裝置，其中為控制裝置預定額定壓力。一方面為有效防止在注射系統中超出危險壓力，另一方面為通過減少功率或者關閉驅動機構來避免注射過程的不必要的延長，並為提高多個以注射器連續實行的注射過程的流量設置為使得控制裝置比較由壓力測量裝置檢測的液體壓力和額定壓力，並當在時間段上超過額定壓力時，對壓力測量裝置檢測的壓力的時間上的壓力變化曲線關於時間段積分以測定壓力積分，並當測定的壓力積分超過預定積分極限值時，關閉或者以較低的泵浦功率運行泵。
