| 摘要 |
The present invention relates to a nonreturn warning device for an intravenous drip infusion which includes a top member and a bottom member both of which forms an accommodation which has an inlet pipe and an outlet pipe at the top and bottom thereof. The outlet pipe includes a flange around which a recess is provided. A conic valve with a middle hole is arranged onto the flange. A float with a cylindrical stopper is received in the accommodation formed after connection of the top member and the bottom member. The middle section of the float contains a magnetic element, and a warning device is fitted beside the top member. Besides, a magnetic reed switch is installed in the warning device. As the float sinks with the fluid surface in the accommodation, the magnetic element approaches the magnetic reed switch and the magnetic force of the float will activate a buzzer for giving out a warning sound which is transmitted through a headphone jack or a radio transmitter to the nurses' call station. Moreover, the cylindrical stopper is inserted through the middle hole of the conic valve when the float sinks with the fluid surface in the accommodation. And the outlet pipe can be sealed at the end of the intravenous drip in order for nurses to replace an I.V. container. Furthermore, the nonreturn warning device for an intravenous drip infusion is repeatedly usable.
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