US 12,337,118 B2 · System and method for non-invasive ventilation

Abstract

Systems and methods for non-invasive ventilation are provided. The systems may include a gas source that provides breathing gases to a patient through one or more of a primary flow path (PFP) and a flushing flow path (FFP). The system may include a control assembly configured to open and restrict gas flow through the PFP. When the PFP is open, a significant portion of the gas flows through the PFP while the remaining gas flows through the FFP. When the PFP is restricted, a significant portion of the gas flows through the FFP. Increased flow through the FFP may have a high velocity (especially relative to the flow through the PFP). Gas delivered through the FFP may be used to flush dead space. One or both flow paths may contribute to inspiratory positive airway pressure (IPAP), expiratory positive airway pressure (EPAP), and/or positive end expiratory pressure (PEEP).

Claims25

Dependent claims

A system for providing respiratory gas to a patient, the system comprising:

a patient interface;
a breathing circuit to provide fluid communication between a source of respiratory gas and the patient interface, the breathing circuit and patient interface defining a primary flow path and a flushing flow path from the source of respiratory gas;
and
a control assembly configured to dynamically vary flow through the primary flow path by opening and restricting the primary flow path in response to dynamic changes in gas flow or resistance to gas flow, such that when the control assembly increases a restriction to flow through the primary flow path, flow of respiratory gas through the flushing flow path increases,
wherein the control assembly also comprises a feedback port adapted to fluidly couple to a breathing chamber of the patient interface, and is configured to increase the resistance to gas flow of the primary flow path when a feedback pressure coupled from the breathing chamber to the control assembly is greater than about a gas source pressure.

2 more elements

A system for non-invasive ventilation comprising:

a gas source conduit adapted to be fluidly coupled at a first end to a gas source and comprising at a second end a bifurcation having a first branch and a second branch;
a primary flow path conduit adapted to be coupled to the first branch of the bifurcation as part of a primary flow path;
a flushing flow path conduit adapted to be coupled to the second branch of the bifurcation as part of a flushing flow path having a higher resistance to gas flow than primary flow path;
a patient interface comprising a breathing chamber and a nasal flow delivery part, constructed such that the breathing chamber is in the primary flow path and the nasal flow delivery part is in the flushing flow path;
a control assembly coupled or adapted to be coupled to the primary flow path, the control assembly comprising a movable member movable between a first position in which the movable member increases a resistance to gas flow through the primary flow path and a second position in which the movable member does not increase the resistance to gas flow through the primary flow path, the movable member configured to move between the first position and the second position in response to pressure changes within the breathing chamber of the patient interface;
and
wherein a portion of the primary flow path conduit and a portion of the flushing flow path conduit share a wall.

4 more elements

Dependencies are inferred from the claim text.

System and method for non-invasive ventilation

Life of this patent

System and method for non-invasive ventilation

Life of this patent

Abstract

Claims25