Abstract: A drug solution injector for determining an accurate injection volume of a drug solution by weighing the drug solution reservoir with a weighing scale. A drug solution injector is provided with a weighing scale that is compact, does not disturb handling and enables an accurate determination of the injection volume of the drug solution. A drug solution injector includes a drug solution reservoir composed of a chamber for reserving a drug solution therein and pressurization mechanism for pushing out of the reserved drug solution. An injection line is connected to the reservoir to inject the drug solution to the body. The drug solution reservoir is fixedly provided with a weighing scale for measuring a weight of the drug solution stored in the drug solution reservoir.

Abstract: During use of a drug solution injector for continuous injection of a drug solution such as an anesthetic, an analgesic agent, an anticancer agent, an antibiotic, etc., into the body, it would be possible to determine an accurate injection volume of the drug solution by weighing the drug solution reservoir with a weighing scale such as an electronic balance. However, the above procedure is difficult to carry out at home and is inconvenient for hospitals since it requires use of the weighing scale at each measurement. It is an object of the present invention to provide a drug solution injector with a weighing scale that provides a solution for the above problems, is compact, does not disturb handling and enables to determine an accurate injection volume of the drug solution.