Common troubleshooting methods of patient monitor

Patient monitor is a device or system which can measure and control the physiological parameters of patients, compare them with known set values, and give an alarm if they exceed the standard. The patient monitor must continuously monitor the physiological parameters of patients for 24 hours, detect the changing trend, and point out the critical situation for doctors to deal with urgently, so as to minimize the complications and achieve the purpose of relieving and eliminating the disease.

Monitor manufacturersThe patient monitor is mainly composed of host, display screen, lead wire, cuff and other components. The whole machine realizes the functions of signal acquisition, analog processing, digital processing and information output. Sensors sense various physiological changes, then amplifiers enhance the information, and then convert it into electrical information. Data is calculated, analyzed and edited by data analysis software, and then displayed in each functional module of the display screen, or recorded and printed as required. When the monitored data exceeds the set index, it will activate the alarm system and send a signal to attract the attention of medical staff. The patient monitor mainly monitors six parameters, namely ECG, respiration, blood oxygen saturation, pulse and body temperature. Other parameters were also detected at the same time, such as invasive blood pressure, end-respiratory carbon dioxide, respiratory mechanics, anesthetic gas, cardiac output, bispectral index and so on. In addition to measuring and monitoring physiological parameters, the use of patient monitor also includes monitoring and processing medication and pre-and post-operation conditions. It is clinically used in operation, post-operation, trauma care, coronary heart disease, critically ill patients, newborns, premature babies, delivery rooms, etc. Patient monitor, as a practical precision instrument in hospital, will inevitably break down during use. Some common troubleshooting, the first thing is to find the fault point, so how to find the fault point? You can refer to the exclusion sequence given by the following monitor manufacturers: 1. Do it after understanding It's not too late to ask the truth, know the cause and effect. Many faults are caused by misoperation of users. Sometimes the machine was disassembled and studied for a long time, which was caused by improper use. First of all, the user should know under what conditions the fault occurs, whether there is smoke, burnt smell, flash and fever, and whether switches, buttons and plug-ins have been moved before the fault. 2. From the outside in First, check whether there are obvious cracks and defects in the appearance of the monitor, whether the plug is loose, and understand its maintenance history, and then check the inside of the monitor. Check whether the copper foil of the circuit board is broken, broken, soldered or ignited, whether the components are deformed, desoldering, damaged, burnt and cracked, whether the fuse is blown, whether the coil is in good condition and whether the contacts are ablated. The host can be disassembled only after the peripheral fault possibility has been ruled out. Don't rush to replace damaged electronic components, and consider replacing damaged electronic components after confirming that the circuits of peripheral devices are normal. 3. Machinery before electronics, power before equipment Only after the mechanical parts are confirmed to be trouble-free, do the electronic inspection. When checking circuit faults, the detection instrument should be used to find the fault position. After confirming that there is no poor contact fault, the fault rate of the power supply part of the line is targeted, which accounts for a high proportion of the whole fault equipment. Therefore, repairing the power supply first can often get twice the result with half the effort. 4. From static to dynamic, power is turned on after power is turned off first When the equipment is not powered on, judge whether the electronic components are good or bad. If it can't be judged, conduct power-on test, measure parameters, judge faults and carry out maintenance. During power-on inspection, special attention should be paid to whether the indicator light and fluorescent screen are normal, whether there is smoke in the machine, etc., and whether the transformer and integrated circuit are hot after power failure. If they are all normal, they can be measured and checked. 5. Make full use of instruments and equipment If you can't find faults intuitively, you must use instruments and tools: (1) measuring resistance Measuring resistance can judge components such as capacitance, diode and resistance. The quality of triode can also be judged by the ohm gear of multimeter. First, find the base, then determine the tube type, emitter and collector. Pn junction has small forward resistance and large reverse resistance. If there is a large capacitance in the circuit under test, it should be discharged first. (2) Measuring voltage Use the multimeter DC voltage block to detect the DC voltage output by the power supply part, the DC voltage of each pole of the transistor and the DC voltage of each pin of the integrated circuit to the ground. (3) measuring current It mainly measures the working current of the whole machine or a circuit. When measuring the working current of the whole machine, the circuit must be disconnected, and the multimeter current block should be connected in series with the circuit (the multimeter should be powered on after being connected). In addition, it can also measure jack current, working current of integrated circuit, etc.