Spring piloted safety valve with jet venturi bias
First Claim
1. A lung ventilator safety valve for relieving pressure from a vent in a patient airway of a ventilator system, said safety valve having a valve open position venting pressure from the patient airway and a valve closed position, and said safety valve comprising:
- a valve housing fluidly connected to a vent having a valve seat in the patient airway;
a poppet valve seal mounted adjacent to the valve seat of the vent for allowing a relief flow from the vent in the valve open position and for sealing the vent in the valve closed position;
a pilot spring urging said poppet valve diaphragm to the valve closed position to seal the vent, whereby said poppet valve seal will move to the valve open position to allow the relief flow when pressure within the patient airway exceeds the biasing force of the pilot spring, to protect a patient from excess pressure in the patient airway;
an electromagnetic coil mounted to said valve housing, said electromagnetic coil when energized urging said valve to the valve closed position; and
a return spring disposed in said valve housing opposing said pilot spring and the electromagnetic coil when energized, whereby said electromagnetic coil allows said poppet valve seal to move to the valve closed position when said electromagnetic coil is energized, and said return spring causes said poppet valve seal to move to the valve open position to allow the relief flow when said electromagnetic coil is not energized, to provide an emergency air pathway for a patient in the event of interruption of power to the ventilator.
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Accused Products
Abstract
The lung ventilator safety valve includes a valve housing, an armature connected to the valve housing, a shaft mounted at one end to the armature and having a poppet valve seal on the other end for sealing the vent in a valve closed position and for allowing a relief flow in a valve open position. An electromagnetic coil mounted to the valve housing adjacent to the armature when energized urges the armature to the armature closed position, and a return spring urges the armature to an open position. The poppet valve seal has an aperture extending through the poppet valve seal, so that when there is relief flow through the safety valve vent, the relief flow across the poppet valve seal creates a jet venturi effect to cause a negative pressure on the side of the poppet valve seal opposite the relief flow that biases the safety valve to open further.
215 Citations
6 Claims
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1. A lung ventilator safety valve for relieving pressure from a vent in a patient airway of a ventilator system, said safety valve having a valve open position venting pressure from the patient airway and a valve closed position, and said safety valve comprising:
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a valve housing fluidly connected to a vent having a valve seat in the patient airway; a poppet valve seal mounted adjacent to the valve seat of the vent for allowing a relief flow from the vent in the valve open position and for sealing the vent in the valve closed position; a pilot spring urging said poppet valve diaphragm to the valve closed position to seal the vent, whereby said poppet valve seal will move to the valve open position to allow the relief flow when pressure within the patient airway exceeds the biasing force of the pilot spring, to protect a patient from excess pressure in the patient airway; an electromagnetic coil mounted to said valve housing, said electromagnetic coil when energized urging said valve to the valve closed position; and a return spring disposed in said valve housing opposing said pilot spring and the electromagnetic coil when energized, whereby said electromagnetic coil allows said poppet valve seal to move to the valve closed position when said electromagnetic coil is energized, and said return spring causes said poppet valve seal to move to the valve open position to allow the relief flow when said electromagnetic coil is not energized, to provide an emergency air pathway for a patient in the event of interruption of power to the ventilator. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification