Pressure controller for artificial respirator and artificial respirator using the same

An artificial respirator configured to control a gas pressure by a pressure controller,

• said pressure controller comprising:
• a housing mechanism which has a first vent hole, a second vent hole and a third vent hole, and in which one of the first vent hole and the second vent hole is configured to be used as an inlet of an inspiratory gas and the other vent hole is configured to be used as an outlet of the inspiratory gas;
• a control valve placed in said housing mechanism to face a gas passage between the first vent hole and the second vent hole;
• elastic biasing means for elastically biasing said control valve against a valve seat formed in said housing mechanism;
• an adjustment operating member to be operated to adjust an elastic biasing force of said elastic biasing means;
• and
• an adjustment manipulating member to be pivoted to operate said adjustment operating member, and
• said pressure controller being configured such that said control valve closes the third vent hole when a gas pressure in the gas passage is lower than a predetermined level, and said control valve opens the third vent hole such that a gas in the gas passage flows through the third vent hole when the gas pressure in the gas passage is higher than a predetermined level,
• wherein said adjustment operating member does not operate even when said adjustment manipulating member pivots by a pivoting operation of said adjustment manipulating member in a first state in which said adjustment manipulating member is not drawn outwardly against said adjustment operating member, and said adjustment operating member operates to adjust the elastic biasing force of said elastic biasing means when said adjustment manipulating member pivots by the pivoting operation of said adjustment manipulating member in a second state in which said adjustment manipulating member is drawn outwardly against said adjustment operating member.