An ancillary system for surgery, comprising: an exhaust device comprising a tubular structure with a first end and a second end departed from the first end , and a head portion disposed at the first end with a surface of the head portion having one or more vents formed thereon, further comprising a scalpel device comprising a blade portion and a connecting arm connected to the blade portion , wherein at least a portion of the connecting arm is encapsulated by the exhaust device ; and an exhaust valve module , comprising: an exhaustion-adjustable flow channel having a first opening connected to the tubular structure of the exhaust device , a second opening configured for connecting to a low-pressure evacuation device , and a third opening in communication with the first opening and the second opening ; and an evacuation controlling valve configured to selectively open or close the second opening of the exhaustion-adjustable flow channel to enable or disable the low-pressure evacuation device , wherein the exhaust valve module is configured for a substance generated during a surgical procedure to enter the tubular structure via the one or more vents and be discharged through the exhaust valve module , provided that the exhaust device is configured to operate in a normal exhausting mode, the low-pressure evacuation device is disabled by the evacuation controlling valve , and the third opening remains open. an exhaust device comprising a tubular structure with a first end and a second end departed from the first end , and a head portion disposed at the first end with a surface of the head portion having one or more vents formed thereon, further comprising a scalpel device comprising a blade portion and a connecting arm connected to the blade portion , wherein at least a portion of the connecting arm is encapsulated by the exhaust device ; and an exhaust valve module , comprising: an exhaustion-adjustable flow channel having a first opening connected to the tubular structure of the exhaust device , a second opening configured for connecting to a low-pressure evacuation device , and a third opening in communication with the first opening and the second opening ; and an evacuation controlling valve configured to selectively open or close the second opening of the exhaustion-adjustable flow channel to enable or disable the low-pressure evacuation device , an exhaustion-adjustable flow channel having a first opening connected to the tubular structure of the exhaust device , a second opening configured for connecting to a low-pressure evacuation device , and a third opening in communication with the first opening and the second opening ; and an evacuation controlling valve configured to selectively open or close the second opening of the exhaustion-adjustable flow channel to enable or disable the low-pressure evacuation device , wherein the exhaust valve module is configured for a substance generated during a surgical procedure to enter the tubular structure via the one or more vents and be discharged through the exhaust valve module , provided that the exhaust device is configured to operate in a normal exhausting mode, the low-pressure evacuation device is disabled by the evacuation controlling valve , and the third opening remains open. <EOS>