Low concentration oxygen inhalation (oxygen inhalation concentration below 50%): generally used for chronic bronchitis, emphysema, pulmonary heart disease, etc. Also known as chronic obstructive pulmonary disease. When chronic respiratory failure is out of compensation, the increase of oxygen partial pressure must be considered when inhaling oxygen. Excessive oxygen partial pressure can weaken the reflex stimulation of carotid sinus to respiratory center, thus reducing ventilation and aggravating carbon dioxide retention. So oxygen should be used with caution. Generally, low-concentration continuous oxygen inhalation is used, and mechanical breathing therapy is added when necessary.
In general, low-concentration oxygen inhalation through nasal catheter is used for family oxygen inhalation. Inhaled oxygen concentration is 30%-40%.
Because when the nasal catheter absorbs oxygen, there is also a nostril to breathe air. So according to the oxygen inhalation formula:
Inhaled oxygen concentration =2 1+4* outlet flow * outlet oxygen concentration%.
Calculated as 30% of inhaled oxygen concentration.
1, oxygen concentration 99%. The outlet flow of oxygen machine should be 2.3 liters/minute.
2. According to the oxygen concentration of 93%, the outlet flow of molecular sieve oxygen compressor should be 2.42 liters/minute. General molecular sieves can only achieve 93%. To achieve 99% concentration, the cost is about twice that of a 93% concentration machine. Therefore, molecular sieves rarely produce 99% oxygen, because the cost is too high for consumers to bear.
3. Haiyao Pharmaceutical House adopts oxygen-enriched membrane technology, and the oxygen concentration of the outlet gas of the oxygen compressor can only reach 30%-40%. According to the oxygen absorption formula, the outlet flow of the oxygen generator needs 7.5 liters/minute, which will make people feel that the air flow is too fast. If the airflow is turned down, the inhaled oxygen concentration will not reach 30%, so the oxygen concentration inhaled by the oxygen workers in Haiyao House is generally lower than 30%, because the airflow is too fast and uncomfortable.
4. The cost of oxygen-enriched membrane technology is generally half that of molecular sieve technology. Molecular sieves also have advantages and disadvantages. Each has its own advantages. In clinic, low-flow oxygen supply is the most commonly used method for such patients.