A device and method for coughing up phlegm for limiting the volume of coughed up air

Abstract

The present invention proposes a sputum expectoration method that limits the amount of coughed up air, including: S1, for a sputum expectoration cycle, sequentially control the positive pressure inflation phase, negative pressure exhaust phase and PEEP maintenance phase; S2, detect positive pressure in the positive pressure inflation phase. Pressure inflation volume I‑V; S3, detect negative pressure exhaust volume E‑V in the negative pressure exhaust phase; S4, when E‑V reaches a certain ratio of I‑V, enter the PEEP maintenance phase; S5, in PEEP Keep in phase, so that the air volume in the airway higher than PEEP is released slowly. The present invention also proposes a device for expectoration, including: a positive pressure device, a negative pressure device, and a PEEP device; an expectoration pipeline; a two-way flow sensor for monitoring the amount of positive pressure inflation and expulsion; a tube for monitoring the expectoration The airway pressure sensor of the pressure in the road; the expectoration controller, which switches on and off the positive pressure device, negative pressure device and PEEP device according to the monitored data. The present invention monitors the timing of switching from the negative pressure exhaust phase to the PEEP maintenance phase, so that the residual gas volume of the patient's lungs at the end of the cough is not lower than the residual gas volume during normal breathing.

Description

Technical field [0001] The present invention relates to automatic coughing techniques, more particularly, to a cough and method for limiting cough out of gas. Background technique [0002] Cough is a physiological mechanism of normal person to remove the secretion of breathing airway. However, for some patients with cough dysfunction disease, such as neuromuscular diseases, mechanical ventilation intubation patients, with a certain external force to remove airway secretions. [0003] Mechanical charge and exhaust gas (MI-E) device, commonly known as coughing machine, is a well-known device that is used to assist patients with invalid cough to remove harmful secretions in their airways. This device simulates the cough physiological mechanism of normal people, controls the pipeline (mask connection end, bite connection end, or trachea connection end), or a tracheal intubation connection end, or a tracheal intubation connection end, or a trachea. Pressure phase) and set negative exh...

AI Technical Summary

Problems solved by technology

[0009] (1) Excessively high positive and negative pressure switches repeatedly, causing the patient's alveoli to open and close repeatedly, which is likely to cause alveolar shear injury;

[0010] (2) Negative pressure suction has the risk of causing excessive collapse of the patient's alveoli. Negative pressure suction causes the patient's lung volume to be lower than the normal functional residual capacity, reduces the oxygenation capacity of the lung, and causes hypoxia in severe cases;

[0011] (3) Due to the above risks, the MI-E device is not suitable for patients who rely on high PEEP (positive end expiratory pressure) to maintain their normal oxygenation, including postoperative atelectasis, Patients with acute respiratory distress syndrome (ARDS), cardiogenic pulmonary edema, etc. These patients are usually ICU patients who rely on ventilator support. There are few clinical applications of cleaning

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