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US 2011/0209702 A1Published application
Proportional Solenoid Valve For Low Molecular Weight Gas Mixtures
AssigneeNellcor Puritan Bennett LLC
InventorsSteve Vuong, David Winter
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Abstract
This disclosure describes systems and methods for ventilating a patient with a gas mixture containing a low molecular weight gas, such as helium. The disclosure describes a novel proportional solenoid valve for controlling a low molecular weight gas mixture in a medical ventilator with reduced leakage.
Claims18
A medical ventilator system, comprising:
- a processor;
- a source of heliox;
- and
- a proportional solenoid valve controlled by the processor and adapted to control the flow of heliox from the heliox source, the proportional solenoid valve comprising
- a seat,
- a poppet, and
- an elastomeric material adhering to at least one of the seat and the poppet to form an elastomeric seal when the proportional solenoid valve is closed.
4 more elements
A pneumatic system comprising:
- a processor;
- a ventilation system including a patient circuit controlled by the processor;
- a pressure generating system controlled by the processor, the pressure generating system is adapted to generate a flow of breathing gas in the patient circuit;
- a source of heliox;
- and
- a proportional solenoid valve controlled by the processor and adapted to control the amount of the heliox delivered into the patient circuit, the proportional solenoid valve comprising
- a seat,
- a poppet, and
- an elastomeric material adhering to at least one of the seat and the poppet to form an elastomeric seal when the proportional solenoid valve is closed.
6 more elements
Dependencies are inferred from the claim text.