Medical ventilators mainly include invasive ventilators, non-invasive ventilators, and high-frequency ventilators, and there are significant differences in their applicable scenarios.
Invasive ventilators need to be connected to the patient's airway through endotracheal intubation or tracheotomy, providing accurate and powerful ventilation support. In clinical practice, for severe respiratory failure, such as respiratory dysfunction caused by severe pneumonia or acute respiratory distress syndrome (ARDS), where spontaneous breathing is almost impossible to sustain life, invasive ventilators have become a key treatment device. After some major surgeries, if the patient's anesthesia is not fully restored and the respiratory muscle strength is insufficient, invasive ventilators are also needed to assist the patient in overcoming the stage of weak respiratory function. In addition, for severe neurological disorders such as high-level spinal cord injury leading to respiratory muscle paralysis, invasive ventilators can provide long-term assistance to maintain the patient's respiratory function.
Non invasive ventilators are connected to patients through non-invasive methods such as face masks and nasal masks, which are relatively more comfortable and cause less damage to patients. It is applicable to patients with mild to moderate respiratory failure, such as patients with chronic obstructive pulmonary disease (COPD) who have carbon dioxide retention in the acute exacerbation period, but not to the extent that tracheal intubation is required. The non-invasive ventilator can help patients to expel carbon dioxide and improve hypoxia. Patients with sleep apnea syndrome experience respiratory pauses due to upper airway collapse during nighttime sleep. Non invasive ventilators maintain airway openness through continuous positive pressure ventilation to ensure normal breathing during sleep. For some patients with pulmonary edema caused by heart failure, positive pressure ventilation with non-invasive ventilators can reduce the burden on the heart and improve respiratory and circulatory function.
The ventilation frequency of a high-frequency ventilator is much higher than the normal human respiratory rate, and it provides rapid ventilation with a small tidal volume. Mainly suitable for neonatal respiratory distress syndrome, immature lung development in newborns, lack of pulmonary surfactant, high-frequency ventilation can maintain the opening of alveoli at lower airway pressure and reduce the occurrence of barotrauma. For some serious lung diseases in adults, such as severe ARDS, when conventional ventilation methods are ineffective and may even cause lung damage, high-frequency ventilators can be used as an alternative or auxiliary ventilation method to improve gas exchange and increase oxygenation levels through ventilation modes.
