towards suction opening 3 the resulting current is then extracted by suction opening 3 when both air flows unite in the ablation area they cause a particularly intensive gas throughput that effectively removes particulates from the ablation area deposits of particles on flap 7 are prevented by the air flow direction and the intensive gas throughput the particles that cause the unpleasant odor for both the physician and the patient are minimized this way in one embodiment the described effect is achieved if the discharge openings have a diameter of 6 mm and the gas flow passes the ablation area with a speed of 3 m s the negative suction pressure is coordinated in such a way that the resulting gas flow at the suction nozzle is taken up for example with a flow rate of 3 l s the incidence angle of the gas flows in relation with the horizontal plane is approximately within the range of 40 u00b0 u00b1 15 u00b0 and the y angle 10 is around 100 u00b0 u00b1 20 u00b0 the size of the angles and the arrangements of the elements ensure that the gas flows will be obstructed as little as possible by the anatomy of the head nose brows etc the distance.