1. Different working states:
The single-stage ventilator can continuously output constant pressure, and the single-stage ventilator provides physiological pressure to support the upper airway, which ensures the opening of the upper airway during sleep.
Bi-level ventilator provides patients with two different positive airway pressures. When the patient inhales, it provides higher pressure to facilitate inhalation, while when the patient exhales, it provides lower pressure, which can be set to higher inhalation pressure and lower exhalation pressure respectively. When the patient inhales, the machine provides a high inspiratory pressure to keep the airway clear, and when exhales, it provides a low expiratory pressure to ensure the patient's breathing is smooth, and the machine keeps pace with breathing.
2. The role of patients is different:
Single-level ventilator is suitable for most patients with snoring and sleep apnea syndrome, and single-level ventilator is suitable for common OSA. Namely patients with mild, moderate and severe obstructive sleep apnea syndrome.
Bi-level ventilator is suitable for all kinds of patients with sleep apnea syndrome and all patients who need noninvasive ventilation treatment, such as cor pulmonale and chronic obstructive pulmonary disease. To help patients excrete carbon dioxide and inhale more oxygen.
Extended data:
Ventilator classification:
1. Classification by use or application type
Controlled mechanical ventilation?
Definition: When the patient's spontaneous breathing weakens or disappears, the patient's breathing is completely generated, controlled and regulated by mechanical ventilator. ?
Application: the disappearance or weakening of spontaneous breathing caused by disease; When spontaneous breathing is irregular or the frequency is too fast, and mechanical ventilation can't cooperate with patients, spontaneous breathing can be inhibited or weakened by artificial methods.
Auxiliary mechanical ventilation (AMV)?
Definition: When the patient's breathing exists, the ventilator assists or enhances the patient's spontaneous breathing. All kinds of mechanical ventilation are mainly triggered by patients' inspiratory negative pressure or inspiratory airflow. ?
Application: Although spontaneous breathing exists and is regular, it is weakened and has insufficient ventilation for patients.
2. Classification according to the purpose of mechanical ventilation.
Intrathoracic or airway pressure type
Chest appearance
3. Classify according to the switching mode of inspiratory phase and expiratory phase.
Constant pressure type: after the pressure in the airway reaches the expected value, the ventilator opens the exhalation valve, and the chest and lungs passively collapse or exhale under negative pressure. When the pressure in the airway continues to drop, the ventilator generates airflow through positive pressure again, causing inhalation.
Constant volume type: the predicted tidal volume is sent to the lungs through positive pressure, and after reaching the predicted tidal volume, the gas supply is stopped and the expiratory state is entered.
Timing: supply gas according to the pre-designed inspiratory and expiratory time.
Hybrid (multi-functional).
4. Supply gas according to ventilation frequency
High frequency ventilation: ventilation frequency >; 60 times/minute. ?
Advantages: low airway pressure, low intrathoracic pressure, little interference to circulation, and no need to seal airway. ?
Disadvantages: it is not conducive to the elimination of carbon dioxide. ?
Classification: high-frequency positive pressure ventilation, high-frequency jet ventilation and high-frequency oscillation ventilation.
Constant frequency ventilation: ventilation frequency
5. According to whether there is a synchronization device or performance classification.
Synchronous ventilator: When the patient's spontaneous breathing begins, it can trigger the ventilator to supply gas to the patient's respiratory tract, resulting in inspiratory action.
Non-synchronous ventilator: The negative pressure of the patient's breathing or inhalation cannot trigger the ventilator to supply gas, and it is generally only used for patients with controlled mechanical ventilation.
6. Classification by applicable objects
Active nasal cpap system for infants
active nasal cpap system for infants
Adult ventilator
7. Classification according to working principle
Simple ventilator
Membranous lung