What are the common faults of color Doppler ultrasound machine?

Power supply circuits are mainly of series type and switch type, which are basically composed of oscillation, voltage transformation, rectification, filtering and voltage stabilization. Its function is to convert alternating current into stable alternating current and DC voltage, and provide energy for the machine. The power supply circuit has high working current, high calorific value and high failure rate. Such as rectifier bridge and voltage stabilizing block, these components may be damaged when the load is too heavy (that is, the current is too large), the grid voltage is too high and the temperature is too high (such as poor heat dissipation). Therefore, it is necessary to install an AC regulator to stabilize the power supply voltage; Install air conditioner to reduce indoor temperature and regularly remove dust inside the machine. These measures can completely reduce the possibility of partial damage of the power supply and greatly reduce the failure rate of the machine.

2, color ultrasound probe failure

Color ultrasound probe is a unique part of color ultrasound, and its fault is unique, but it is not complicated. Commonly used color ultrasound probes include wired array probes and mechanical sector scanning probes. Among them, the mechanical sector scanning probe has many faults, and the common fault is that there are bubbles in the sector scanning probe. The treatment methods are: draining oil and refueling. The treatment method is described in related books and will not be described here. Another common fault is that the sector scanning probe does not rotate, usually because the driving motor of the probe itself is damaged. At this time, the treatment is more troublesome, and the probe needs to be sawed.

3, display part of the fault

The display part of color Doppler ultrasound is actually a computer, with a host, a monitor and a camera monitor. The monitor consists of video amplification, scanning and display, and will display ultrasonic images from the host computer with high resolution. Through practice, we feel that the failure of display mostly occurs in the scanning part, and the failure rate of line scanning is the highest, which is similar to that of power supply part. When the line scanning part works normally, it consumes almost more than half of the power of the whole display. In normal operation, it has a series of heating elements, such as line output tubes and line output transformers.

4. Keyboard failure

In fact, the keyboard of color Doppler ultrasound is basically the same as that of a computer, and the maintenance ideas and methods are basically the same as those of repairing a computer keyboard. It is also composed of various function keys and alphanumeric keys, which is the part of color ultrasound operation. Because of the different manufacturers and models of machines, keyboards are slightly different, but they can be roughly divided into two types: one is composed of independent button switches; One is the full touch button, which is generally the latest product. The most typical failure of keyboard is poor contact, which is mostly caused by dust, contact oxidation or damage of conductive rubber in touch switch, but poor contact caused by dust is more common.

5. Failure caused by machine vibration

Medical color Doppler ultrasound is a very complicated electronic instrument, which has many boards, plug-ins and wiring. When subjected to large vibration, these plug-ins may be loose and lead to poor contact, thus making some functions of the whole machine or machine unable to work normally.