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J Med Syst (2017) 41: 1DOI 10.1007/s10916-016-0650-y
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The Use of Stepper Motor-Controlled Proportional Valve for Fio2
Calculation in the Ventilator and its Control with Fuzzy Logic
Adem Glck1 & nan Gler2
Received: 26 June 2016 /Accepted: 24 October 2016 /Published online: 5 November 2016 # Springer Science+Business Media New York 2016
Abstract This article proposes the employment of a proportional valve that can calculate the amount of oxygen in the air to be given to patient in accordance with the amount of FiO2 which is set from the control menu of the ventilation device. To actualize this, a stepper motor-controlled proportional valve was used. Two counts of valves were employed in order to control the gases with 2 bar pressure that came from both the oxygen and medical air tanks. Oxygen and medical air manometers alongside the pressure regulators were utilized to perform this task. It is a fuzzy-logic-based controller which calculates at what rate the proportional valves will be opened and closed for FiO2 calculation. Fluidity and pressure of air given by the ventilation device were tested with a FlowMeter while the oxygen level was tested using the electronic lung model. The obtained results from the study revealed that stepper motor controlled proportional valve could be safely used in ventilation devices. In this article, it was indicated that fluidity and pressure control could be carried out with just two counts of proportional valve, which could be done with many solenoid valves, so this reduces the cost of ventilator, electrical power consumed by the ventilator, and the dimension of ventilator.
Keywords Proportional valve . FiO2 . Medical air . Manometer . Fuzzy logic control . Stepper control
NomenclatureFiO2 Fraction of Inspired Oxygen
SLPM Standard Liter Per MinuteLPM Liter Per MinuteSCPV Stepper Controller Proportional Valve I2C Inter Integrated Circuit
Introduction
FiO2, which is the oxygen concentration during mechanical ventilation, can take in the ventilator a value between %21 and %100 [1]. In this study, proportional valve was used in order to adjust the oxygen level provided to patient. Many research groups, whose aims were the accomplishment of ventilation, oxygenation, elimination of CO2 and control of temperature, proposed various ventilator prototypes. Volume controlled ventilation is the...