Bronchial atresia: Three-dimensional CT bronchography using volume rendering technique

The switch actuator provided comprises a rubber dome, a housing, a keytop and a plunger. The rubber dome is seated on the switch and is selectively deformed to actuate the switch. The housing receives the rubber dome therein and has an upper opening defining an edge of the opening and has an inner surface. The plunger moves reciprocally within the housing and is guided by the edge during the reciprocal movement of the keytop. The keytop, which has a bottom surface, moves reciprocally and vertically together with the plunger to selectively deform the rubber dome to actuate the switch as the result of the operation of the user. The invention is characterized in that a slant surface is formed on the inner surface of the housing to retain the bifurcated hook end of the plunger to reduce the noise generated during movement of the plunger.