A piston ventilator and its control method

Abstract

The invention discloses a piston type respirator. The piston type respirator comprises an air cylinder piston mechanism, a respirator motor assembly used for driving the air cylinder piston mechanism,a tidal volume motor assembly used for driving the respirator motor assembly, an exhaust assembly used for exhaust and a controller used for coordinating and controlling motion of all the assembliesand detecting various feedback signals. Compared with a traditional piston type respirator, the piston type respirator has volume control and pressure control modes and is more accurate in control, high in adjusting efficiency and wider in application range. The invention further discloses a control method of the piston type respirator. When pressure needs to be adjusted, the tidal volume is preset according to preset parameters, the air quantity needed to be injected is calculated when the pressure reaches the preset value by measuring the relation between the gas quantity injected in the inspiration stage and the lung pressure change, the number of times of adjustment before reaching the target pressure is greatly reduced, the preset pressure value can be reached by conducting adjustment2-3 times, and the adjusting efficiency is improved substantially.

Description

technical field [0001] The invention belongs to the technical fields of scientific research and animal medical treatment, and relates to a ventilator, in particular to a piston ventilator and a control method thereof. Background technique [0002] With the development of medical electronic technology, there are more and more types and forms of ventilators, and their performance is becoming more and more perfect. A ventilator is a tool for performing mechanical ventilation, which is used to improve oxygenation and ventilation of patients or experimental animals, support respiratory and circulatory functions, and treat respiratory failure. Animal ventilator is an important equipment widely used in scientific research experiments such as basic medicine, clinical medicine and animal medicine. It is an important support means in the process of making animal models. It is often encountered that animals breathe abnormally. At this time, it is necessary to use artificial assistance...

AI Technical Summary

Problems solved by technology

[0004] At present, when controlling the pressure control mode of piston ventilators, the pressure value is generally adjusted through algorithms such as PID, that is, the tidal volume of breathing is adjusted by comparing the pressure value of several breaths, thereby changing the inspiratory pressure until reaching the target pressure. Finally, it takes one breathing cycle to verify the effect of the adjustment. Using this method requires multiple adjustments to reach the target value. For animals with slow breathing rates, it takes a long time for the lung pressure to reach the set value, and the adjustment efficiency is low.

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