Artificial respirator automatically releasing respiration path simultaneous with occurrence of unit failure of power interruption

Claim 1

An artificial respirator comprising: a respiration circuit with a pressure release outlet therein; a valve having a valve housing mounted over said outlet, a valve head reciprocally mounted in said valve housing to close said outlet, and a valve stem having a first end connected to said valve head, said valve head being movable between an open position wherein vapor pressure will be released from said release outlet and a closed position for preventing release of vapor pressure through said release outlet; solenoid means with a movable iron core operatively connected to a second end of said valve stem; spring means mounted in said housing and operatively connected to said valve head to bias said valve head to said closed position; said solenoid means, when activated, in conjunction with said spring means each generating a sufficient force to normally hold said valve head in the closed position until the vapor pressure in the respiration circuit reaches a predetermined limit whereupon the valve head will move to the open position, and after release of vapor pressure from the release outlet, the force of the solenoid means and the force of the spring means will return the valve head to the closed position; permanent magnet means located with respect to said iron core for generating a magnetic force that can move said iron core in a direction opposite to that of said spring, said magnetic force being stronger than the force of said spring means; means for generating an emergency output signal during emergency operation, said signal deactivating said solenoid means thereby eliminating the force of said solenoid means whereafter said magnetic force is sufficient to overcome the force of the spring means to cause said valve head to move to the open position for release of said vapor pressure from said respiration circuit.