Abstract: The present invention discloses an afterload device for ex situ heart perfusion, which includes an afterload energy storage module, a pressure regulation module and two flow rate regulators that are connected through a conduit. The afterload energy storage module includes a rigid closed container and a flexible container. The perfusion fluid flows into the flexible container from one side thereof through the conduit, and the perfusion fluid flows out from the flexible container at another side thereof as the flexible container is subjected to the action of the medium pressure in the rigid hermetic container. The pressure regulation module includes two pressure regulation valves and a compressible-medium source, for regulating the pressure range within the rigid hermetic container to be always maintained between the set diastolic pressure and the set systolic pressure.

Abstract: The present invention discloses an afterload device for ex situ heart perfusion, which includes an afterload energy storage module, a pressure regulation module and two flow rate regulators that are connected through a conduit. The afterload energy storage module includes a rigid closed container and a flexible container. The perfusion fluid flows into the flexible container from one side thereof through the conduit, and the perfusion fluid flows out from the flexible container at another side thereof as the flexible container is subjected to the action of the medium pressure in the rigid hermetic container. The pressure regulation module includes two pressure regulation valves and a compressible-medium source, for regulating the pressure range within the rigid hermetic container to be always maintained between the set diastolic pressure and the set systolic pressure.

Abstract: The invention relates to an assistant system for the tour guide, comprising a tour guide roll-call device, a plurality of labels for tourists and an intelligent mobile phone. The tourist guide roll-call device communicates with the labels tourists wearing via wireless network; the intelligent mobile phone communicates with the roll-call device via Bluetooth. After the tour guide roll-call device is respectively connected to the labels tourists wearing and the intelligent mobile phone, the intelligent mobile phone sends roll-call signal to the labels tourists wearing via the tour guide roll-call device. In setting area, the labels tourists wearing receive the roll-call signal and send feedback signal. The tour guide roll-call device receives the signal and sends it to the intelligent mobile phone. The intelligent mobile phone reads the signal to judge whether tourists are in place, and displays the roll-call result information on the screen.