Adjustable flow restrictor applied to independent lung ventilation

Abstract

The invention discloses an adjustable flow restrictor applied to independent lung ventilation, which comprises a front shell, a distance-adjustable rear shell and a control diaphragm, wherein an airflow inlet communicated with a breathing machine is arranged on the front shell, and an airflow outlet communicated with an air tube is arranged on the distance-adjustable rear shell; the center of the control diaphragm is provided with a round hole, and the control diaphragm is arranged at the rear end in the front shell; and the distance-adjustable rear shell is arranged at the rear end of the front shell and can horizontally move forwards and backwards along the front shell, so that the distance between the distance-adjustable rear shell and the control diaphragm can be adjusted. The adjustable flow restrictor is simple and is easily operated, the implementation cost is low, only one breathing machine is used for synchronous-ventilation of bilateral lungs, the inspiration flow of either lung can be independently adjusted, and the expiration of a patient is not influenced. The adjustable flow restrictor can obviously reduce the difference of the inspiration flow between different-compliance bilateral lungs and meanwhile effectively reduces airway opening pressure and intrapulmonary pressure of the flow restriction side.

Description

technical field [0001] The present invention relates to the technical field of mechanical ventilation, more specifically, it relates to an adjustable airflow limiter that can independently adjust the inspiratory flow rate of each side of the lung without affecting the resistance of the return airflow. streamer. Background technique [0002] The pathological feature of unilateral lung disease (ULD) is that only one lung has disease or the disease is mainly on one side. Conventional ventilation methods apply the same pressure to both lungs, and the flow distribution depends on the comprehensive influence of bilateral compliance and airway resistance, which may not achieve sufficient gas exchange, or even worsen the gas exchange, and damage relatively normal one side of the lung. Differential lung ventilation (DLV) is a technique that ventilates each lung independently or selectively ventilates one lung. Usually, for patients with unilateral or asymmetric lung disease confir...

AI Technical Summary

Problems solved by technology

The disadvantages of this split-side lung ventilation scheme are: due to the complex structure of the circuit, it is easy to leak and fall off, and it is difficult to monitor the ventilation mechanics; the resistance flow-limiting device in the circuit can form resistance to exhalation, which may lead to increased PEEP, making Overinflation of the uninjured lung, causing pressure injury

Afterwards, if the pressure drop along the pipe is increased p 1 -p 2 , the upstream transwall pressure p 1 -p e unchanged, it can lead to "flow limitation", that is, the maximum value of flow Q is limited; if the flow Q is increased, p 2 -p e unchanged, it leads to "limited pressure drop", that is, p 1 -p 2 limited by the maximum

However, the relevant structure of the above-mentioned principle has not been seen in the prior art

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