A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
A61M 16/00 (2006.01) A61H 31/00 (2006.01) A62B 7/02 (2006.01) B01D 53/047 (2006.01) C01B 13/02 (2006.01)
Patent
CA 2330063
The present invention called a patient ventilator oxygen concentration system advantageously utilizes an existing suitable air supply and provides a modular oxygen concentrator that uses the existing air supply and a medical grade air filtration package for providing medical grade using the existing air supply. The oxygen concentrator has multiple bed pairs which can be selectively activated. If one of the multiple bed pairs is not activated, the excess air provided by the existing air supply is filtered and medical grade air is supplied instead of oxygen gas for use with patient ventilators. Advantageously, the present invention obtains a large increase in medical grade air flow at the expense of very little oxygen flow while maintaining oxygen purity using the existing air supply. It is not possible to make this air/oxygen trade-off using a conventional pressure swing absorption (PSA) system for maintaining oxygen purity. The present invention provides a pneumatic circuit which is capable due to a modular bed design. Each bed pair uses approximately three SCFM (80 SLPM) to produce five SLPM of oxygen. Shutting down a bed pair reduces the oxygen flow but increases the available compressed air to be converted into medial grade air. The remaining bed pair maintains their oxygen purity because the compressed air supply is not reduced. By contrast, if a single bed pair system were used, reducing the oxygen output would not free up a significant amount of feed air to be converted into medical grade air. If the demand for medical grade air increased beyond rated flow, the oxygen purity would decrease due to the transfer of feed air from the PSA bed pair to the medical grade air system.
Cantrill Dean
Zugmaier Michael
Litton Systems Inc.
Sim & Mcburney
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