Daily maintenance of ultrasound

Common medical equipment repair, maintenance, and maintenance of [Ultrasound]

1) Temperature, humidity, pressure

>It is best to equip the room with a wet and dry thermometer.

>Temperature limit: 5-40 degrees in the power-on state, the best operating temperature is around 25 degrees. -40-55 degrees in the power-off state. It is best to equip air conditioning equipment.

>Humidity limit: 30%-80% in the power-on state, 30%-93% in the power-off state. It is generally not recommended to place the instrument on the ground floor. It is best to equip a dehumidifier and dehumidify regularly. Try not to use a wet mop to mop the floor. (Pay attention to rooms with sinks)

Pressure limit: 70-106KPa in the power-on state, 50-106KPa in the power-off state

(2) Power supply

>Input voltage limit 198V-242V.

>It is best to equip a professional high-precision voltage regulator, do not use cheap household voltage regulators, its various indicators do not meet the requirements, such as instantaneous response time, ripple coefficient, surge voltage, etc.

>The power value of the equipment is generally indicated on the nameplate on the back cover of the instrument. Equip the voltage regulator with a power of 1.5 to 2.5 times this value.

If you want to equip a UPS power supply, it is best to use an online type, do not use a backup UPS power supply (cheap household type). Some old UPS power supplies do not have voltage regulation function, the output is not a sine wave, it is a square wave, and some equipment is not supported. (You can directly connect a 100-watt light bulb to see if there is any flickering)

Voltage regulators have pointer or digital displays, which should be checked frequently to avoid accidents.

(3) Grounding requirements

>The role of grounding is mainly divided into three categories: protective grounding, system grounding, and anti-interference grounding. Protective grounding is to introduce leakage current into the ground, system grounding is that the machine must be grounded to work, and anti-interference grounding is self-explanatory.

>The methods of anti-interference grounding mainly include single-point grounding (common ground) and multi-point grounding. Generally, low-frequency electronic equipment uses single-point grounding, and high-frequency electronic equipment uses multi-point grounding.

>When using medical equipment, be sure to connect the ground wire. The ground wire must be in good contact with the ground. It cannot be simply connected to water pipes, heating pipes, or metal doors and windows, because heating pipes are not connected to the ground, the joints of water pipes are coated with insulating paint to seal them, and some water pipes use plastic joints, etc. If the ground wire is connected to it, not only will it not achieve the purpose of protection, but it will also bring serious interference and increase safety hazards.

>For medical equipment, the grounding resistance should be close to 4XXXXX, and the smaller the grounding resistance, the smaller the leakage current. The leakage current of the outer casing of general medical equipment must be less than 300uA, the leakage current of intracorporeal instruments such as heart catheter electrodes or pacemaker electrodes should be less than 10uA, and the leakage current of patient lead wires must be less than 50uA. In order to reduce the grounding resistance, the diameter of the ground wire should be thick, and it should not be too long, and the installation of the ground wire should meet the technical requirements.

>Operators or engineers should regularly check the grounding of various equipment. If poor contact is found, it should be dealt with in time. Low-frequency medical electronic instruments should use common grounding, and high-frequency signal equipment should use multi-point grounding. (Each grounding point requires digging a pit more than 1 meter deep, burying a copper plate with a length and width of no less than 20cm and a thickness of 0.5cm, and using a thick wire to lead out.

>If the hospital has unified grounding wires, three-phase plugs, three-phase sockets, and three-phase power strips must be used.

(4) Preventing external interference

>There should be no high-power electronic equipment, high-frequency transmitting devices, radio frequency therapy instruments, etc. around the room.

>There should be no mobile or Unicom base stations and antennas on the roof.

>If there are more than two ultrasound machines, the distance between them should not be too close.

>The power supply line of the B-ultrasound room should preferably not share the same line with other large-scale equipment in the hospital.

>Units with conditions should shield the entire room when decorating the room.

>Spray anti-static spray on carpets and oilcloths.

>Lay anti-static mats.

>Connect a ground wire between the machine and the examination bed.

Common faults and maintenance

(1) The host does not work

It's the same as when it's not turned on, that is, the display is black, the keyboard light is not on, the fan does not rotate, and there is no sound. This indicates that the host power system has not started. First check the power strip, power cord, fuse, etc.

(2) The display is black

That is, there are phenomena indicating that the host system has started, but there is no display on the display. First, adjust the brightness and contrast of the display to the maximum (generally clockwise to increase, if you are not sure, adjust it to the middle position). If it doesn't work, you can print pictures with a video printer to see, check if images can be acquired with a workstation, and if not, consider connecting an external display to see, so you can roughly determine whether it is a display problem.

(3) The display flickers

You can appropriately adjust the brightness and contrast potentiometers of the display to see if there is any change. Some are due to problems with a certain contact point inside the potentiometer, and appropriate adjustment can solve the problem.

(4) Water may have entered the machine

In this case, you must not turn on the machine by yourself. You must contact the manufacturer's engineer and handle it under their guidance. (After opening the machine casing and drying the water-in parts with a hair dryer, check it again before turning on the machine)

(5) Error code prompt appears

Be sure to write down all the prompt content, and then carefully recall under what circumstances this situation occurred, then turn off and restart to see if it can be solved, and explain the detailed process to the engineer. In short, after the machine malfunctions, generally speaking, turn it off and restart it. If it doesn't work, contact the engineer. The fault phenomenon must be described clearly, especially some seemingly unimportant details.

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