| 摘要 |
PURPOSE: To discriminate the normal installed state and wrong installed state of a transfusing tube, and the disconnected state of a pressure sensor, and improve the safety for patient. CONSTITUTION: Since no pressure is added to a pressure sensor 20 in a normal installed state (a) where a transfusing tube is installed onto a transfusing operation part, a pressure sensitive conductive layer 11 is separated from a second electrode 12, and the resistance value between a first electrode 10 and the second electrode 12 is the resistance value (several 10KΩ) of a resistor 13. In a wrong installed state (b) where the transfusing tube is slipped from the transfusing operation part and protruded onto the pressure sensor 20, the transfusing tube is pressed by a door to add a prescribed pressure or more to the pressure sensor 20, and the pressure sensitive conductive layer 11 is pressed onto the second electrode 12, and the resistance value between electrodes is reduced to severalΩor less. In the disconnected state of the pressure sensor 20, the resistance between electrodes is a value of several 10MΩlarger than the resistance of the resistor 13.
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