Difference between mono- and bi-level ventilators:
1. Different working status:
Mono-level ventilators can continuously output a constant pressure, mono-level ventilators are to provide a physiological pressure to support the upper airway, which has been to ensure the opening of the upper airway during sleep.
The bi-level ventilator is to provide two different positive airway pressures for the patient, when the patient inhales to provide a higher pressure to facilitate inhalation, when the patient exhales to provide a lower pressure, can be set up separately for higher inspiratory pressure and lower expiratory pressure, when the patient in the inhalation of the machine to provide a higher inspiratory pressure to keep the airway open, and exhalation of the lower expiratory pressure to ensure that the patient breathes smoothly, the machine and breathing to keep synchronization. The machine is synchronized with breathing.
2. Different patients:
Single level ventilator is suitable for most of the patients with snoring and sleep apnea syndrome, and single level ventilator is suitable for common OSA, that is, mild, moderate and severe patients with Obstructive Sleep Apnea Syndrome (OSAS).
The bi-level ventilator is suitable for all kinds of sleep apnea syndrome patients and all patients who need to be treated with non-invasive ventilation, such as pulmonary heart disease, chronic obstructive pulmonary disease, and so on, to help the patients expel carbon dioxide and inhale more oxygen.
Extended information:
Ventilator classification:
1. Classification by type of use or application
Controlled mechanical ventilation (CMV)?
Definition: the patient's breathing is generated, controlled and regulated exclusively by a mechanical ventilator in the presence of diminished or absent spontaneous breathing.?
Applications: loss or reduction of spontaneous respiration due to disease; suppression or reduction of spontaneous respiration by artificial means when it is irregular or too rapid for mechanical ventilation to be coordinated with the patient.
Assisted mechanical ventilation (AMV)?
Definition: Ventilator-assisted or augmented voluntary respiration in the presence of patient's breath. The various kinds of mechanical ventilation are triggered primarily by the patient's inspiratory negative pressure or inspiratory airflow.?
Applied to: patients with reduced voluntary respiration and inadequate ventilation, although voluntary respiration is present and regular.
2. Classification according to the use route of mechanical ventilation
Intrathoracic or airway pressurization type
Extrathoracic
3. Classification according to the way of switching between inspiratory and expiratory phases
Fixed-pressure type: after the pressure in the airway reaches a predicted value, the ventilator opens the expiratory valve, and the thorax and the lungs are passively atelectomized or the expiration is generated by the negative pressure, and when the pressure in the airway is continuously decreasing. ventilator again generates airflow by positive pressure and causes inspiration.
Fixed-volume type: the predicted tidal volume is delivered to the lungs by positive pressure, and when the predicted tidal volume is reached, the air supply is stopped and the expiratory state is entered.
Timed: Supply air according to pre-designed inhalation and exhalation times.
Hybrid type (multi-function type).
4. Ventilation according to ventilation frequency
High-frequency ventilation: ventilation frequency >60 times/min.
Advantages: low airway pressure, low intrathoracic pressure, little interference with circulation, no need to seal the airway.?
Disadvantages: unfavorable to carbon dioxide elimination.?
Categories: high-frequency positive pressure ventilation, high-frequency jet ventilation, high-frequency oscillatory ventilation.
Normal frequency ventilation: ventilation frequency <60 times/minute.
5. Classified according to whether there is a synchronization device or performance
Synchronized ventilator: the start of inspiration of the patient's spontaneous respiration can be triggered by the ventilator, so that it can supply air to the patient's airway and produce an inspiratory action.
Non-synchronized ventilator: the patient's breathing or negative inspiratory pressure can not trigger the ventilator to supply air, generally only used for patients with controlled mechanical ventilation.
6. Classification according to the applicable objects
Infant ventilator
Toddler ventilator
Adult ventilator
7. Classification according to the principle of work
Simple ventilator
Membrane lung