Search

CN-122028946-A - Respiratory support system and method

CN122028946ACN 122028946 ACN122028946 ACN 122028946ACN-122028946-A

Abstract

A respiratory support system includes a first channel and a second channel, each of which is connectable to a patient interface. The first channel is configured to deliver a first gas during an accumulation period. The second channel is configured to accumulate second gas during at least a portion of the accumulation period and to deliver the first gas during a delivery period such that the accumulated second gas is pushed from the second channel to the patient interface. The controller is configured to control the start of the delivery period based on the respiratory cycle of the patient.

Inventors

  • Brett John Hadat
  • ANDREW PAUL MAXWELL SALMON
  • Peter Lawrence Greers
  • DANIEL JOHN SMITH
  • MARK REEVES
  • Ian Patrick Sasfield Xiji
  • Douglas Richard. Wright
  • Sinar Kumar
  • Tang Yanzhao
  • JONATHAN DAVID HARWOOD

Assignees

  • 费雪派克医疗保健有限公司

Dates

Publication Date
20260512
Application Date
20240809
Priority Date
20230811

Claims (20)

  1. 1. A system for providing respiratory support to a patient, the system comprising: A first channel connectable to a patient interface, the first channel configured to deliver a first gas during an accumulation period; A second channel connectable to a patient interface, the second channel configured to accumulate a second gas during at least a portion of the accumulation period and to deliver the first gas during a delivery period such that the accumulated second gas can be pushed from the second channel to the patient interface, and A controller configured to control the start of the delivery period based on a respiratory cycle of the patient.
  2. 2. The system of claim 1, wherein the controller is configured to control the end of the delivery period based on the respiratory cycle.
  3. 3. The system of claim 1 or 2, wherein the controller is configured to control the delivery period and the accumulation period such that at least one occurs at any time within the respiratory cycle.
  4. 4. A system according to any one of claims 1 to 3, wherein the controller is configured to control the delivery period and the accumulation period such that only one occurs at any time within the respiratory cycle.
  5. 5. The system of any one of claims 1 to 4, wherein the controller is configured to control the beginning of the delivery period based on: A selected event of the respiratory cycle, and The delivery period.
  6. 6. The system of any one of claims 1 to 5, wherein the controller is configured to control the beginning of the delivery period such that the delivery period occurs at a desired stage within the respiratory cycle.
  7. 7. The system of claim 6 when dependent on claim 5, wherein the desired phase of the respiratory cycle is different from the selected event within the respiratory cycle.
  8. 8. The system of any one of claims 1 to 7, wherein the controller is configured to control the beginning of the delivery period based on a beginning of patient inhalation.
  9. 9. The system of any one of claims 1 to 8, wherein the controller is configured to control the beginning of the delivery period based on an end of patient inhalation.
  10. 10. The system of any of claims 1-9, wherein the controller is configured to control the beginning of the delivery period based on a beginning of patient exhalation.
  11. 11. The system of any of claims 1-10, wherein the controller is configured to control the beginning of the delivery period based on an end of patient exhalation.
  12. 12. The system of any of claims 1 to 11, wherein the controller is configured to control the beginning of the delivery period based on a high flow phase of patient inhalation comprising a predetermined period of time before and/or after peak inhalation flow.
  13. 13. The system of any of claims 1-12, wherein the controller is configured to control the onset of the delivery period to occur during patient inhalation.
  14. 14. The system of any of claims 1 to 13, wherein the controller is configured to control the beginning of the delivery period to occur in a high flow phase of patient inhalation, the high flow phase of patient inhalation comprising a predetermined period of time before and/or after peak inhalation flow.
  15. 15. The system of any of claims 1-12, wherein the controller is configured to control the onset of the delivery period to occur during patient exhalation.
  16. 16. The system of any one of claims 1 to 15, wherein the controller is configured to control the end of the delivery period to occur during patient inhalation.
  17. 17. The system of any one of claims 1 to 16, wherein the controller is configured to control the end of the delivery period to occur before the end of patient inhalation.
  18. 18. The system of any one of claims 1 to 17, wherein the delivery period is between about 50% and 90%, between about 60% and 80%, or between about 70% and 80% of the duration of inspiration of the patient.
  19. 19. The system of any one of claims 1 to 18, wherein the controller is configured to control the start of the accumulation period based on the start of patient inhalation.
  20. 20. The system of any one of claims 1 to 19, wherein the controller is configured to control the beginning of the accumulation period based on the end of patient inspiration.

Description

Respiratory support system and method Cross Reference to Related Applications The present application claims priority from U.S. patent application Ser. No. 63/519,000, filed 8/11 at 2023, which is incorporated herein by reference in its entirety. Technical Field The present disclosure relates to a system and method for providing respiratory support to a patient. The systems and methods may be used for any type of respiratory therapy. For example, unsealed respiratory therapy, such as high flow therapy, or sealed respiratory therapy, such as Continuous Positive Airway Pressure (CPAP) therapy or bi-level positive airway pressure (BPAP) therapy. Background Respiratory support may be provided to a patient for a variety of reasons, including assisting in breathing by opening the patient's airway and/or providing specific respiratory gases for specific therapeutic purposes. In the case of High Flow Therapy (HFT), the breathing gas may be supplied at a high flow rate (e.g., in excess of 15L/min) that meets or exceeds the peak inspiratory demand of the patient. It may be desirable to provide this high flow throughout the respiratory cycle (i.e., during the inspiration and expiration phases) to achieve the irrigation benefits within the anatomical dead space of the patient or the dead space within the system, such as the patient interface. For example, high flow therapy is sometimes also referred to as Nasal High Flow (NHF), humidified High Flow Nasal Cannula (HHFNC), high Flow Nasal Oxygen (HFNO), high Flow Therapy (HFT), or Tracheal High Flow (THF). Some respiratory support systems use a mixed breathing gas, such as a mixture of air and oxygen supplied to a patient via an inhalation tube. The desired level of blood oxygen saturation in the patient's blood can be achieved by adjusting the ratio of oxygen in the oxygen/air mixture. The mixed breathing gas may be supplied to the patient during both inspiration and expiration, which may result in a waste of oxygen. Disclosure of Invention In one aspect, a system for providing respiratory support to a patient includes: A first channel connectable to the patient interface, the first channel configured to deliver a first gas during an accumulation period; A second channel connectable to a patient interface, the second channel configured to accumulate a second gas during at least a portion of the accumulation period and to deliver the first gas during a delivery period such that the accumulated second gas can be pushed from the second channel to the patient interface, and A controller configured to control the start of the delivery period based on the respiratory cycle of the patient. Throughout this specification, the term "system" refers to a device that delivers breathing gas to a patient. The system may be unidirectional in that any of the breathing gas that is not inhaled by the patient need not be returned to its source and may be expelled. The exhaled gas may be vented to the atmosphere, or may be captured. Similarly, if desired, the breathing gas that is not inhaled may be vented or captured. Throughout this specification, the first channel and/or the second channel may be described as i) the first flow channel and/or the second flow channel comprising an element of the system or another element not belonging to the system, such as a sensor or the controller, ii) the first channel and/or the second channel being connected to an element, iii) some element being located wholly or at least partly in the first channel and/or the second channel, or iv) some element being located on the first channel and/or the second channel. Depending on the particular situation, these elements may or may not form part of the respective channels. Examples of such elements include humidification chambers, valves, active valve mechanisms, first or second gas inlets, reservoirs for the second gas, vents, breathing ports, junctions, and the like. Furthermore, the first channel and/or the second channel may comprise a plurality of segments, portions or sections connected together in series or in parallel, with or without one or more of these elements arranged therebetween. Depending on the particular case, one of the elements described with respect to the second channel may or may not form part of the second channel. The element may also provide a volume for storing the second gas during the accumulation period, or at least provide a dead space through which the second gas may be delivered for delivery to the patient, when the element does form part of the second channel. The controller may control the end of the delivery period based on the respiratory cycle. The controller may control the delivery period and the accumulation period such that at least one of them occurs at any time within the respiratory cycle. The controller may control the delivery period and the accumulation period such that only one occurs at any time within the respiratory cycle. The controller may control the beginn