Ventilator Based On A Fluid Equivalent Of The "Digital To Analog Voltage" Concept
First Claim
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1. A method, comprising:
- providing a ventilation system for receiving at least one input gas, the ventilation system comprising at least one valve bank to meter a flow of the at least one input gas and deliver an output gas to a patient, the at least one valve bank comprising a plurality of valves with each valve comprising a respective orifice;
receiving a set of ventilation parameters;
based on the set of ventilation parameters, determining, for each of a plurality of successive time intervals in an inspiration cycle, a respective plurality of operating states for selected valves in the at least one valve bank to provide the output gas, the output gas having at least one of a selected gas composition and flow trajectory;
when an inspiration cycle is initiated, implementing, for each successive time interval, the determined operating states for the selected valves in the at least one valve bank.
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Abstract
The present invention is directed to a ventilator that, in one embodiment, uses one or more valve banks having precalibrated orifices to perform real time control of flow metering devices and, in a second embodiment, uses a choked flow orifice and upstream gas pressure regulator to generate a desired flow trajectory.
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Citations
24 Claims
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1. A method, comprising:
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providing a ventilation system for receiving at least one input gas, the ventilation system comprising at least one valve bank to meter a flow of the at least one input gas and deliver an output gas to a patient, the at least one valve bank comprising a plurality of valves with each valve comprising a respective orifice; receiving a set of ventilation parameters; based on the set of ventilation parameters, determining, for each of a plurality of successive time intervals in an inspiration cycle, a respective plurality of operating states for selected valves in the at least one valve bank to provide the output gas, the output gas having at least one of a selected gas composition and flow trajectory; when an inspiration cycle is initiated, implementing, for each successive time interval, the determined operating states for the selected valves in the at least one valve bank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A ventilator, comprising:
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at least one valve bank to meter a flow of at least one input gas and deliver an output gas for patient inhalation, the at least one valve bank comprising a plurality of valves with each valve comprising a respective orifice; and a control module operable to determine, for each of a plurality of successive time intervals, a respective plurality of differing operating states for at least one of the valves in the at least one valve bank and, during an inspiration cycle, provide control signals to implement, for each successive time interval, the determined operating states for the at least one valve to provide the output gas. - View Dependent Claims (10, 11, 12, 13)
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14. A method, comprising:
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providing a ventilator to receive at least one input gas from at least one gas source and deliver an output gas for patient inhalation, the ventilator comprising at least one gas regulator to control a pressure of the at least one input gas and at least one valve positioned downstream of the gas regulator, wherein the at least one valve comprises an orifice and the output gas is derived from the at least one gas source; and while maintaining the at least one valve at choked flow, varying the input gas pressure to provide differing output gas flow rates - View Dependent Claims (15, 16, 17, 18, 19)
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20. A ventilator to provide an output gas for patient inhalation, the ventilator comprising:
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at least one gas regulator to control a pressure of at least one input gas; at least one valve positioned downstream of the gas regulator, wherein the at least one valve comprises an orifice and the output gas is derived from the at least one input gas; and a control module operable to vary the input gas pressure to provide differing output gas flow rates for differing patients while maintaining the at least one valve at choked flow. - View Dependent Claims (21, 22, 23, 24)
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Specification