OBJECTIVETo add the functions of automatic selection, automatic switching to ventilator by improving medical air compressor installed in SMART ventilator.

METHODSInstalled sensors control equipment, etc., in the gas circuit of air compressor programmed with C language, controlled switching device by ventilator MCU.

RESULTSWhen central gas supply instrument broke down and caused supply pressure decrease below the lower limit, ventilator can automatically switch to air compressor supply at the same time in alarm; when pressure of central gas supply returning to normal ventilator can intelligently switch back to central gas supply.

CONCLUSIONSThe installation of air switching device increases the intelligence of ventilator, and avoids ventilator abnormal phenomenon caused by air factors.