What is the Flow Trigger Mode of the Ventilator?
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Flow rate (flow rate) trigger switching means that the patient starts new spontaneous breathing after the patient completes exhalation. When the airway gas flow rate (flow basin) drops to a preset value, the machine immediately delivers air to the patient according to the set parameters. The preset value is called the flow rate (or flow rate) trigger level (or flow rate trigger sensitivity), which can be adjusted according to the patient's spontaneous breathing. The advantages of flow rate triggering are stable triggering and high sensitivity, which is conducive to patients inhaling fresh gas.
(2) Flow trigger sensitivity
During assisted ventilation, the ventilator uses a specific sensor to detect the change in the flow velocity of the basic airflow in the airway when the patient inhales spontaneously, thereby triggering the inspiration. When the flow rate of the basic airflow in the airway drops by a certain value, the ventilator triggers inhalation, and this decreased value is the flow trigger sensitivity. The size of the flow trigger sensitivity is set by the doctor according to the patient's condition.
(3) Implementation of traffic trigger
Anti-COVID 2019 Star Ventilator
1. Commonly used basic flow method
The basic airflow is usually used to trigger the flow rate. The specific method is: at the end of the last expiration, the machine sends a low-level constant flow rate basic airflow (usually 5-1OL/min) into the pipeline, and sends it from the air supply pipe of the pipeline, and the airflow passes through the Y-shaped joint. , From the exhalation tube to the exhalation valve to exit the machine. When the patient takes an autonomous inhalation action, the basal airflow in the airway will change (decrease), and the ventilator monitors the change in airflow. When the magnitude of the change reaches the preset trigger sensitivity (usually 1 to 31Jmin), Trigger the machine to start aspirating. For example, the basic air flow at the end of the expiration of the machine is 81/min, and the trigger sensitivity is set to 21/min. When the air flow rate in the airway drops to 6L/min, the machine starts to deliver air.
The low-level continuous airflow should be able to meet the patient's inhalation effort, and the flow trigger sensitivity setting level should be lower than the basic airflow level, generally lower than 2LPM. Some ventilators have an automatic compensation function. When the set level of flow trigger sensitivity is higher than the set level of basic airflow, the machine will automatically make up the difference. In addition, in order to ensure the necessary trigger sensitivity, the machine should automatically detect the air leakage of the pipeline and automatically compensate to ensure the correct basic air flow. When using the flow rate trigger, if the air leakage of the pipeline is greater than the basic air flow, it will cause automatic triggering.
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