DENTAL EXTRAORAL VACUUM DEVICE

PROBLEM TO BE SOLVED: To judge whether suction-exhaustion operation is properly performed or not by providing an indicator displaying the vacuum suction force in an exhaust pipe to the outside of the exhaust pipe. SOLUTION: An exhaust pipe (flexible tube) 6 is attached so as to be guided into a water supply/drain box 4 by an attaching member 12 having an arm 11 integrally provided thereto. The indicator 20 obserbing the suction force (exhaustion quantity) in the exhaust pipe 6 is provided to monitor whether clogging is generated in an exhaust pipe route. The indicator 20 is constituted so that a piston 22 is provided in a transparent cylinder 21 and the spring 23 transferring the piston 22 to one end in the cylinder 21 and the cylinder 21 is allowed to communicate with the exhaust pipe 6 on the side where the spring 23 is arranged. By this constitution, it can be judged whether suction- exhaustion operation is certainly performed or not and, when exhaustion is not sufficiently performed, a vacuum pump is stopped to inspect an exhaustion pipe route to prevent the burn-off of the vacuum pump.