| 摘要 |
[Problem] To provide an infusion pump that can accurately obtain linearity of the output voltage of a Hall element of an occlusion sensor with respect to changes in the diametral dimensions of an infusion tube, and can accurately detect the state of occlusion of the infusion tube. [Solution] The occlusion sensor (52, 53) has a Hall element (410) that converts changes in the diametral direction of the infusion tube (200) to an output voltage by detecting changes in the magnetic flux of magnets (411, 412) arising alongside the linear movement of a plunger (403) resulting from changes in the diametral direction of the infusion tube resulting from the occlusion of the infusion tube. When the distance of motion of the plunger (403) is increased to a predetermined plurality of positions (D1 to D4), a control unit (100) imparts to the Hall element (410) a predetermined plurality of imparting voltages (BE1 to BE16) for each distance of motion of the plurality of positions (D1 to D4), and selects from among the plurality of imparting voltages imparted for each distance of motion of the plurality of positions, thus obtaining linearity of the output voltage (PV1 to PV4) of the Hall element with respect to the distance of motion of the plurality of positions (D1 to D4). |
