Lung ventilator safety circuit
First Claim
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1. A lung ventilator safety valve apparatus for relieving pressure in a patient airway of a ventilator system, comprising:
- a solenoid valve connected to a patient airway of a ventilator system, said solenoid valve having an open position venting pressure from said patient airway when no power is applied to the valve and a closed position with a predetermined closing force when power is applied to the valve, said solenoid valve being biased to the open position, and said solenoid valve operating in the closed position to open when the pressure in the patient airway is equal to or greater than said predetermined closing force;
a programmable valve controller connected to said solenoid valve for controlling operation of said solenoid valve, said valve controller including means for setting the maximum airway pressure threshold said valve controller causing said solenoid valve to open when the pressure in said patient airway is equal to or greater than a predetermined maximum airway pressure threshold.
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Abstract
The lung ventilator safety valve circuit includes a normally open, pulse width modulated solenoid safety valve connected to a patient airway of a ventilator system. A pressure sensor monitors pressure in the patient airway, and a control unit maintains the safety valve closed when the pressure is not excessive. The safety valve is opened when the sensed pressure equals or exceeds a maximum airway pressure threshold that can be set by an operator, or in the event of a power failure.
200 Citations
5 Claims
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1. A lung ventilator safety valve apparatus for relieving pressure in a patient airway of a ventilator system, comprising:
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a solenoid valve connected to a patient airway of a ventilator system, said solenoid valve having an open position venting pressure from said patient airway when no power is applied to the valve and a closed position with a predetermined closing force when power is applied to the valve, said solenoid valve being biased to the open position, and said solenoid valve operating in the closed position to open when the pressure in the patient airway is equal to or greater than said predetermined closing force; a programmable valve controller connected to said solenoid valve for controlling operation of said solenoid valve, said valve controller including means for setting the maximum airway pressure threshold said valve controller causing said solenoid valve to open when the pressure in said patient airway is equal to or greater than a predetermined maximum airway pressure threshold. - View Dependent Claims (2, 3)
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4. A method for relieving pressure in a patient airway of a ventilator system, said ventilator system including a solenoid valve connected to a patient airway of a ventilator system, the solenoid valve being biased to an open position venting pressure from the patient airway when no power is applied to the valve and a closed position having a closing force when power is applied to the valve, the steps of the method comprising:
setting a programmed closing force of the solenoid valve, whereby said valve operates to open in the closed position when the pressure in the patient airway is equal to or greater than the programmed closing force. - View Dependent Claims (5)
Specification