A circulating smoke exhausting apparatus that feeds a predetermined gas and sucks smoke generated in the cavity of the patient 14 together with the gas in the cavity and circulates and exhausts is connected to the pump 20 that circulates the gas and a patient connected to the pump 20. The pumping member 9 is connected to the pump 20, and the suction tube 8 and the pumping member 21 are connected to the pump 20 to suck the gas in the cavity of the patient 14 from the cavity of the patient 14. The filter 211 that filters the gas, the filter color detection unit 25 that monitors the clogged state of the filter 211, the display unit 1a that displays the clogged state of the filter 211, and the pump 20 according to the monitoring result of the filter color detection unit 25 And a pump control unit 24 for controlling the output of.所定の気体を送気すると共に、患者１４の腔内で発生した煙を腔内の気体と共に吸引し循環排煙する循環排煙装置は、気体を循環させるポンプ２０と、ポンプ２０に接続され患者１４の腔内に気体を送気する送気チューブ９と、ポンプ２０と接続され患者１４の腔内から患者１４の腔内気体を吸引する吸引チューブ８及びポンピング部材２１と、ポンピング部材２１に設けられ気体をろ過するフィルタ２１１と、フィルタ２１１の詰まり状態を監視するフィルタ色検知部２５と、フィルタ２１１の詰まり状態を表示する表示部１ａと、フィルタ色検知部２５の監視結果に応じてポンプ２０の出力を制御するポンプ制御部２４と、を有する。
