Patent ID: 8116991

Claim:
A portable device for measuring a flow rate of Ringer's solution, comprising: a key input unit including a number input key through which a user can provide an input each time a drip drips in a drip chamber; a power supply unit for supplying power; an oscillation circuit for oscillating a signal having a preset frequency; a display unit for quantitatively outputting a calculated flow rate of Ringer's solution; and a control unit configured to: (a) determine whether the number of inputs provided for by the user exceeds a preset drip number, (b) when the number of inputs provided by the user does not exceed the preset drip number, the control unit is further configured to: obtain an elapsed time when the number of inputs provided by the user reaches the preset drip number, calculate the number of drips per hour using the preset drip number and the elapsed time, calculate a quantitative flow rate of Ringer's solution by multiplying a preset volume of each drip and the calculated number of drips per hour, and output the calculated quantitative flow rate to the display unit, and c) when the number of inputs provided by the user exceeds the preset drip number, the control unit is further configured to: select the last inputs provided by the user up to the preset drip number, calculate an elapsed time that it takes for the selected inputs to be provided, calculate the number of drips per hour using the preset drip number and the calculated elapsed time, calculate the quantitative flow rate of Ringer's solution by multiplying a preset volume of each drip and the calculated number of drips per hour, and output the calculated quantitative flow rate to the display unit.