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.