Resistance matching in a patient circuit

摘要

A system configured to deliver pressurized gas to an airway of a subject in accordance with a predetermined therapeutic algorithm. The system includes a pressure generator that generates a pressurized flow of breathable gas and a circuit that communicates the pressurized flow of breathable gas from the pressure generator to the airway of the subject. In order to facilitate the delivery of the pressurized gas to the airway of the subject in accordance with the predetermined therapeutic algorithm, a resistance of the circuit to gas flow is supplemented so that the overall resistance of the circuit is at or near a predetermined level.

主权项

1. A system configured to deliver a pressurized flow of gas to an airway of a subject, comprising:
a pressure generator configured to generate the pressurized flow of gas and control one or more parameters of the pressurized flow of gas using a predetermined algorithm based on and accounting for a predetermined circuit resistance level; and a circuit selectively configurable by the subject that defines a gas flow path between the pressure generator and the airway of the subject, wherein the circuit, when selectively configured by the subject, includes: an interface appliance configured to provide gas to and receive gas from the airway of the subject, the interface appliance forming a flow path between a conduit interface opening and one or more subject interface openings, wherein the one or more subject interface openings communicate gas between the airway of the subject and the interior of the interface appliance, and wherein the flow path formed by the interface appliance between the conduit interface opening and the one or more subject interface openings has a first resistance to gas flow; a conduit that forms a flow path between a first opening and a second opening, wherein the first opening receives gas from the pressure generator, wherein gas with the flow path formed by the conduit is communicated to the conduit interface opening of the interface appliance via the second opening, and wherein the flow path formed by the conduit between the first opening and the second opening has a second resistance to gas flow; and one or more flow limiting features disposed within the circuit, the one or more flow limiting features structured to provide a predetermined supplemental resistance to gas flow within the circuit, and wherein the overall resistance to gas flow within the circuit is a function, at least in part, of an aggregation of the first resistance, the second resistance, and the predetermined supplemental resistance, and wherein the predetermined supplemental resistance is chosen such that the predetermined supplemental resistance increases the overall resistance to gas flow within the circuit to the predetermined circuit resistance level when the circuit is selectively configured to include the interface appliance and the conduit.