Gas mixing module and breathing machine and anesthesia machine with same

Abstract

The invention provides a gas mixing module, and a breathing machine and an anesthesia machine with the same. The gas mixing module comprises a shell (5), a mandrel (2), and a stepping motor (9), wherein the shell (5) has a mixing cavity (52), and a first cavity (51) and a second cavity (53) which are arranged on two sides of the mixing cavity (52) respectively, and the first cavity (51) and the second cavity (53) are communicated with the mixing cavity (52) through a first air outlet (512) and a second air outlet (532) respectively; the mandrel (2) passes through the first cavity (51), the mixing cavity (52) and the second cavity (53) axially in turn and has a shoulder (22) which is accommodated in the mixing cavity (52); and the stepping motor (9) drives the mandrel (2) to move axially, and the opening of the first air outlet (512) and the second air outlet (532) is changed simultaneously through the axial movement of the shoulder (22). The gas mixing module can accurately control the position of the shoulder of the mandrel in the mixing cavity, improve the positioning repeatability of the mandrel, and improve the accuracy and reliability of the breathing machine and the anesthesia machine.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a gas mixing module for mixing two different gases such as air and oxygen, and a ventilator and anesthesia machine with the module. Background technique [0002] During the use of medical devices such as ventilators and anesthesia machines, patients need to be mechanically ventilated. For patients undergoing treatment, the size control of ventilation and the adjustment of oxygen concentration are very important, especially for infants and critically ill patients. Accurate, sensitive and continuous adjustment of oxygen concentration from large tidal volume in adults to small tidal volume in infants determines the accuracy of the ventilator and also determines the grade of the ventilator. [0003] At present, the methods used to adjust the oxygen concentration of ventilators are divided into two different ways: relying on two flow proportional valves to control and adjust, relying o...

AI Technical Summary

Problems solved by technology

Among them, in the way of adjusting the oxygen concentration by relying on two flow proportional valves, due to the limitations of the ordinary flow proportional valve itself, it is difficult to achieve precise control at low flow rates, and it is not only very difficult to replace the high-precision small flow proportional valves. Difficult to meet the requirements of large flow rate and increase product cost accordingly

In devices that rely on the arrangement and combination of electromagnetic valve islands with different diameters, although the adjustment of tidal volume and oxygen concentration can meet high precision by relying on the valve islands, the combination of valve islands greatly increases the design cost. At the same time, the power board It also requires high power to meet the use of the valve island, which increases power loss and reduces battery life

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