Expiratory pressure automatic titration method and system based on expiratory flow limited index

Abstract

The invention discloses an expiration pressure automatic titration method and system based on an expiration flow limited index; the method comprises the steps: in a maintenance stage, when a preset maintenance time is reached, calculating a current expiration flow limited index according to a negative expiration flow, an expiration peak flow and expiration time which are monitored in real time, and entering a regulation stage; determining whether the current expiratory flow limited index is smaller than the expiratory flow limited index at the end moment of the previous adjustment stage or not, and if yes, increasing the positive end expiratory pressure; if not, carrying out the operation of lowering the positive end expiratory pressure; and when the positive end expiratory pressure increasing operation or the positive end expiratory pressure decreasing operation is ended, recording the expiratory flow limitation index when the adjusting stage is ended. The exhaled air flow limitation index provided by the invention has vivid description significance and can be used as an indication of the actual exhaled air flow limitation degree; the method is relatively simple in calculation, does not need hardware support with high complexity requirements, and reduces the product cost.

Description

technical field [0001] The invention relates to the technical field of ventilators, in particular to an automatic titration method and system for expiratory pressure based on an expiratory flow limitation index. Background technique [0002] At present, the automatic expiratory pressure titration function in the ventilator relies on reliable expiratory airflow limitation recognition technology, but these expiratory airflow limitation identification technologies are interfering and will reduce the ventilation experience of patients wearing the ventilator. In addition, These technologies all involve complex control and calculation, and require high-performance hardware support to be realized. [0003] Expiratory airflow limitation is common in patients receiving mechanical ventilation with a ventilator. This phenomenon is mainly manifested as the patient's expiratory airway resistance increases (but the inspiratory airway resistance is relatively normal), so the expiratory ai...

AI Technical Summary

Problems solved by technology

[0008]The automatic expiratory pressure titration function of the current ventilator, based on the expiratory airflow limitation identification technology, has obvious defects: (1) These technologies are interference Whether it is introducing high-frequency oscillations or suddenly reducing airway pressure, these disruptive techniques will not only cause discomfort to the patient but also affect the patient's normal rest (such as patients using a sleep apnea machine); (2) These techniques involve complex control and complex recognition operations

The complexity of technical implementation requires high-performance hardware system support, which will undoubtedly increase the overall cost of the product

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