Introduction

The non-invasive ventilator of our company is a kind of ventilator with pressure control and pressure support. It adopts positive pressure ventilation. The product is used for adult patients with weight over 30kg to treat obstructive sleep apnea syndrome.
DMi520 / 525 / 530 has two operation modes: S / T mode and CPAP (continuous positive airway pressure).
            S / T mode: pressure support / control mode
            This mode can be triggered by autonomous respiration or by machine control. It is determined by the strength of the patient's autonomous respiration. It can adjust the inspiratory pressure (IPAP), end expiratory airway pressure (epap), respiratory rate (RR), inspiratory time (TI) and Inspiratory trigger sensitivity, etc.
            CPAP mode: continuous positive airway pressure ventilation mode
            In this mode, keep the airway pressure unchanged, adjust the sensitivity of inspiratory and expiratory triggering and CPAP.

The ventilator has a pressure sensor inside, which can continuously monitor the change of airway internal pressure and accurately collect the signal of patients triggering breathing.

Scope of application

1. It is only applicable to patients with autonomous breathing.
2. It is designed for noninvasive ventilation and is not suitable for invasive ventilation.
3. It shall not be used for any form of life maintenance, life support, emergency rescue and transportation of critical patients.
4. It can be used in hospitals, some medical institutions, rehabilitation institutions and families. It must be used in strict accordance with the guidance of clinicians and this operation manual.
5. Suitable for adult patients (weight > 30 kg).
6. Daily use time is up to 20 hours.


Contraindications

Do not use the ventilator in patients with severe respiratory failure who cannot breathe autonomously. 
Stop using the ventilator when the following diseases or symptoms occur: 
1. Disease rational hypotension
2. Serious arrhythmia
3. Unstable angina
4. Decompensated heart failure or hypotension, especially related to lack of blood volume
5. Untreated pneumothorax
6. Gas accumulation in mediastinum
7. Serious epistaxis or history of serious epistaxis (risk of recurrence)
8. Brain hernia, recent brain surgery injury or brain surgery (can lead to skull nasopharynx impotence)
Positive airway pressure should be used with caution in suspected patients, such as those with abnormal cribriform plate or a history of brain injury. 
If the patient shows signs of sinusitis or otitis media, treatment may need to be temporarily disabled. 


Adverse Symptoms

If you feel discomfort or any of the following symptoms when using the product, 
please contact your doctor or clinical staff immediately: 
1. A large amount of gas inhaled when awake causes stomach distention
2. Continuous air leakage at the mouth during sleep
3. Dry airway and nose
4. Ear pain, runny nose or sinus pain
5. Daytime sleepiness
6. Disorientation or memory loss
7. Mood change or irritability
8. Skin allergy