Ventilation detection method and device, ventilation apparatus

Patent metadata

Field	Value
Publication number	US-12285560-B2
Application number	US-202117169523-A
Country	US
Kind code	B2
Filing date	Feb 7, 2021
Priority date	Aug 21, 2018
Publication date	Apr 29, 2025
Grant date	Apr 29, 2025

Abstract

A ventilation detection method applied to a ventilation apparatus. The method may include monitoring respiratory parameters during mechanical ventilation of a patient by using a ventilation apparatus, the respiratory parameters at least comprising one of airway pressure and airway flow, and using changes in the respiratory parameters to identify whether man-machine counteraction or ventilation leakage has occurred.

First claim

The invention claimed is:

1. A ventilation detection method for a ventilation apparatus comprising an inspiratory branch, an expiratory branch and a controller, the method comprising:
monitoring, by a ventilation detection device connected to the inspiratory branch, the expiratory branch and the controller of the ventilation apparatus, a respiratory parameter during mechanical ventilation of a patient by using the ventilation apparatus, the respiratory parameter comprising an airway flow; and
using a change of the respiratory parameter to identify whether a man-machine counteraction has occurred and identify a type of the man-machine counteraction,
wherein when the type of the man-machine counteraction is an improper setup of expiratory duration, using the change of the respiratory parameter to identify whether the man-machine counteraction has occurred, comprises:
calculating, by the ventilation detection device, a change of a volume according to the airway flow; and
when the airway flow is incapable of returning to a baseline, but the volume is capable of returning to a baseline at an end of an expiration stage, determining, by the ventilation detection device, that the expiratory duration is set shorter than expiratory duration of the patient; and
adjusting a ventilation parameter of the ventilation apparatus according to the identified type of the man-machine counteraction.

2. The ventilation detection method of claim 1 , wherein using a change of the respiratory parameter to identify whether the man-machine counteraction has occurred comprises:
analyzing a change trend of the respiratory parameter; and
identifying whether the man-machine counteraction has occurred according to the change trend of the respiratory parameter.

3. The ventilation detection method of claim 2 , further comprising:
identifying the type of the man-machine counteraction according to the change trend of the respiratory parameter.

4. The ventilation detection method of claim 3 , wherein the type of the man-machine counteraction comprises one or more of an improper setup of inspiratory flow, an improper setup of inspiratory pressure rise time, an improper setup of inspiratory duration, or the improper setup of expiratory duration.

5. The ventilation detection method of claim 4 , wherein the respiratory parameter further comprises an airway pressure, wherein when the type of the man-machine counteraction further comprises the improper setup of inspiratory flow, identifying, a type of the man-machine counteraction according to the change trend of the respiratory parameter further comprises:
in a constant-flow ventilation mode, when a pressure drop has occurred in a gas delivery section in an inspiration stage, determining that a preset airway flow in the gas delivery section of the inspiration stage is set insufficiently.

6. The ventilation detection method of claim 4 , wherein the respiratory parameter further comprises an airway pressure, wherein when the type of the man-machine counteraction further comprises the improper setup of inspiratory pressure rise time, identifying a type of the man-machine counteraction according to the change trend of the respiratory parameter further comprises:
in a pressure ventilation mode, when the airway pressure is greater than a target value at an end of an inspiratory pressure rise stage and the airway pressure fluctuates, determining that the inspiratory pressure rise time of the ventilation apparatus is set too short; or
in a pressure ventilation mode, when the airway pressure has a pressure drop in an inspiratory pressure rise stage, determining that the inspiratory pressure rise time of the ventilation apparatus is set too long.

7. The ventilation detection method of claim 4 , wherein the respiratory parameter further comprises an airway pressure, wherein when the type of the man-machine counteraction further comprises the improper setup of inspiratory duration, identifying a type of the man-machine counteraction according to the change trend of the respiratory parameter further comprises:
when the airway pressure has a rise or the airway flow has an accelerated drop in an inspiration-to-expiration stage, determining that the inspiratory duration is set longer than inspiratory duration of the patient; and
when the airway pressure has a non-monotonic drop or the airway flow has a non-monotonic rise in an expiration stage, determining that the inspiratory duration is set shorter than the inspiratory duration of the patient.

8. The ventilation detection method of claim 3 , further comprising
calculating a change of a volume according to the airway flow; and
when the airway flow is incapable of returning to a baseline and the volume is also incapable of returning to a baseline at an end of an expiration stage, determining that the ventilation apparatus has a ventilation leakage.

9. The ventilation detection method of claim 3 , further comprising:
outputting ventilation setup adjustment information of the ventilation apparatus according to the identified type of the man-machine counteraction.

10. A ventilation detection device, comprising:
an acquisition unit, connected to an inspiratory branch, an expiratory branch and a controller of a ventilation apparatus, configured to monitor a respiratory parameter during a mechanical ventilation of a patient by using a ventilation apparatus, the respiratory parameter comprising an airway flow; and
a processing unit configured to use a change of the respiratory parameter to identify whether a man-machine counteraction has occurred and identify a type of the man-machine counteraction,
wherein when a type of the man-machine counteraction is an improper setup of expiratory duration, using the change of the respiratory parameter to identify whether the improper setup of expiratory duration has occurred comprises:
calculating a change of a volume according to the airway flow; and
when the airway flow is incapable of returning to a baseline, but the volume is capable of returning to a baseline at an end of an expiration stage, determining that the expiratory duration is set shorter than expiratory duration of the patient,

wherein the processing unit is further configured to adjust a ventilation parameter of the ventilation apparatus according to the identified type of man-machine counteraction.

11. The ventilation detection device of claim 10 , wherein the processing unit is further configured to:
analyze a change trend of the respiratory parameter; and
identify whether the man-machine counteraction has occurred according to the change trend of the respiratory parameter.

12. The ventilation detection device of claim 11 , wherein
the processing unit is configured to identify the type of the man-machine counteraction according to the change trend of the respiratory parameter.

13. The ventilation detection device of claim 12 , wherein the type of man-machine counteraction comprises one or more of an improper setup of inspiratory flow rate, an improper setup of inspiratory pressure rise time, an improper setup of inspiratory duration, or the improper setup of expiratory duration.

14. The ventilation detection device of claim 13 , wherein the respiratory parameter further comprises an airway pressure, wherein when the type of the man-machine counteraction further comprises the improper setup of inspiratory flow, to identify a type of the man-machine counteraction according to the change trend of the respiratory parameter, the processing unit is further configured to:
in a constant-flow ventilation mode, when a pressure drop has occurred in a gas delivery section

Assignees

• Shenzhen Mindray Biomedical Electronics Co Ltd
• Peking Union Medical College Hospital Chinese Acad Of Medical Science And Peking Union Medical Colle
• Peking Union Medical College Hospital Chinese Acad Of Medical Science And Peking Unionmedical Colleg

Inventors

• Xu Jun
• Liu Jinglei
• Yu Xuezhong
• Fu Yangyang
• Zou Xinru
• Zhou Xiaoyong

Classifications

• A61M2205/502

  User interfaces, e.g. screens or keyboards · CPC title

• A61M2205/3334

  Measuring or controlling the flow rate · CPC title

• A61M2205/15

  Detection of leaks · CPC title

• A61M2016/0036

  in the breathing tube and used in both inspiratory and expiratory phase · CPC title

• A61M2016/0027

  pressure meter · CPC title