Air passage system of respirator

Abstract

The invention relates to an air passage system of a respirator. The air passage system comprises an oxygen communicating pipeline, as well as a pressure reducing valve (REG1) and a proportional valve (PSOL1), which are communicated on the oxygen communicating pipeline in series; a high-pressure air communicating pipeline, as well as the pressure reducing valve (REG2) and the proportional valve (PSOL2), which are communicated on the high-pressure air communicating pipeline in series; a mixing cavity and a free respiration valve (SV) communicated with the mixing cavity; a main pipeline, as well as a flow sensor probe (FQ1) and a one-way valve (CV3), which are communicated on the main pipeline in series; and a control air source, wherein the input end of the control air source is communicated with the oxygen communicating pipeline through an air passage beside a one-way valve (CV4), the air passage beside a one-way valve (CV5) is communicated with the high-pressure air communicating pipeline, and the output end of the control air source is communicated with the air inlet end of a two-position three-way valve (SOV1); the air outlet end of the SOV1 is communicated with the control end of the free respiration valve (SV) and a proportional valve (PSOL3), and the exhaust end is communicated with outside atmosphere; and the other end of the PSOL3 is communicated with an air lock and the pneumatic control end of a Peep valve.

Description

technical field [0001] The invention relates to medical equipment, in particular to an air circuit system of a ventilator. Background technique [0002] Traditional ventilator, air circuit structure such as figure 1 As shown, including three gas sources, flow detection and positive end-expiratory pressure (peep) functions, for high-end use, the work is not stable enough, the monitoring is not precise enough, the control is not sensitive enough, the ventilation is still not smooth, and the comfort of the patient is also low. not enough. For example, the flow detection system includes internal detection and external detection, and is composed of a first flow sensor, a second flow sensor, and a first flow sensor probe FQ1 and a second flow sensor probe FQ2. Since the flow detection system is integrated with the entire ventilator air circuit, it is difficult to perform routine online calibration. Although it can also be calibrated, it will inevitably affect the normal use of ...

AI Technical Summary

Problems solved by technology

Since the flow detection system is integrated with the entire ventilator air circuit, it is difficult to perform routine online calibration

Although it can also be calibrated, it will inevitably affect the normal use of the ventilator or the accuracy of flow detection

On the other hand, the external detection is close to the user. Due to the uneven temperature and heat, the internal condensation of the second flow sensor probe FQ2, especially the detection of condensation water in the branch airway, causes the second flow sensor to detect inaccurately and the detection accuracy is not enough, thus affecting Precise control of the ventilator, and these technologies have not yet appeared in the ventilator or related technologies have not been disclosed

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