PROBLEM TO BE SOLVED: To provide an infusion pump capable of inserting an infusion tube to an air bubble sensor without crushing even a part thereof when an opening/closing cover is closed and detecting air bubbles inside the infusion tube no matter whose size among two or more kinds of infusion tubes of different diameters is mounted on the infusion pump.SOLUTION: A guide groove part 350 of an air bubble sensor 51 includes a first guide surface 351 on the side far from a rotary shaft 5A of an opening/closing cover 5 and a second guide surface 352 on the side near the rotary shaft 5A, the first guide surface 351 is a surface parallel to an ultrasonic oscillation element 331, and the second guide surface 352 is a surface inclined to the ultrasonic oscillation element 331. As advancing into the guide groove part 350, an interval between the first guide surface 351 and the second guide surface 352 is formed to be narrow. On the inner side of the opening/closing cover 5, a projection 320 for entering into the guide groove part 350 to hold a part of the infusion tube inside the guide groove part 350 when the opening/closing cover is closed is provided.COPYRIGHT: (C)2013,JPO&INPIT【課題】直径が異なる複数種類の輸液チューブの内の何れのサイズの輸液チューブが輸液ポンプに装着されても、開閉カバーを閉じると気泡センサに輸液チューブの一部を潰すことなく挿入することができ、輸液チューブ内の気泡を 検出できる輸液ポンプを提供する。【解決手段】気泡センサ51のガイド溝部350は、開閉カバー5の回転軸5Aから遠い側の第1案内面351と、回転軸5Aに近い側の第2案内面352を有し、第1案内面351は、超音波発振素子331と平行な面であり、第2案内面352は、超音波発振素子331に対して傾斜した面であり、ガイド溝部350の内部に進むに従って第1案内面351と第2案内面352の間隔が狭く形成され、開閉カバー5の内側には、開閉カバーを閉じるとガイド溝部350内に入り込んで輸液チューブの一部をガイド溝部内に保持させる突起320が設けられている。【選択図】図8
