Problem to be solved: to automatically adjust the pressure of the gas to the pressure suitable for the patient in the gas injection device which expands the gas by the pump in the organ in the pump. Solution: the pressure setting means 5A for initializing the pressure of the gas, the pressure sensor 6 for detecting the internal pressure or the gas pressure, the time counting means 4 for counting the elapsed time from the pump operation, and the pressure detecting value of the pressure sensor and the pressure setting means A control means 7 for controlling the pump is provided on the basis of the pressure set value and the time count value of the time counting means, and the control means 7 stops the pump when the pressure detection value reaches the pressure set value after the pump operation, and the pressure detection value after the pump stop is predetermined than the pressure set value If the pump is operated down and the pressure detection value does not reach the pressure set value during the lapse of time T1, the pressure setting value is lowered by a predetermined width, and the pressure detection value is set to the pressure set value between the elapsed time T2 shorter than the elapsed time T1 and the elapsed time T2, and the pressure setting is set A control is provided for raising a predetermined value. Diagram【課題】造影検査用のガスを臓器内にポンプで送気して臓器を拡張するガス注入装置において、ガスの圧力を患者に適した圧力に自動的に調節する。【解決手段】ガスの圧力を初期設定する圧力設定手段5aと、臓器内圧又はガス送気圧を検出する圧力センサー6と、ポンプ作動からの経過時間を計数する時間計数手段4と、圧力センサーの圧力検出値と圧力設定手段の圧力設定値と時間計数手段の時間計数値に基づいてポンプを制御する制御手段7を設け、制御手段7は、ポンプ作動後圧力検出値が圧力設定値に達するとポンプを停止させ、ポンプ停止後圧力検出値が圧力設定値より所定幅下がるとポンプを作動させ、圧力検出値が経過時間T1の間に圧力設定値に達しない場合は圧力設定値を所定幅下げ、圧力検出値が前記経過時間T1より短い経過時間T2の間に圧力設定値に所定回数達すると圧力設定値を所定幅上げる制御を備える。【選択図】図1
