Medical imaging equipment repair methods

Medical instruments and equipment are an important material foundation for medical institutions and a reflection of their general strength. For example, CT, MRI, DSA, ultrasound diagnostic instruments, etc. These expensive medical imaging devices play an important role in the development of a medical institution. Medical imaging equipment has large investments, high precision, and complex systems, and has very strict requirements on its working environment, installation, and use. To maintain its good operating condition and give full play to its effectiveness, it is particularly important to do a good job in the maintenance and repair of medical instruments and equipment.

1. Maintenance and Maintenance of Instruments and Equipment

The maintenance and maintenance of instruments and equipment are divided into daily maintenance and regular maintenance.

The daily maintenance work generally includes:

① Cleaning of the equipment room and instruments and equipment: Pay attention to adjusting the temperature and humidity of the equipment room to keep it stable.

② Check whether the mechanical rotation of the machine and various parts are normal, and whether the water, gas, and oil passages are unobstructed.

③ Check whether each part of the instrument control panel and the displayed parameters are normal.

④ Use the instrument self-check program to detect the status of each part of the instrument, and pay attention to abnormal phenomena such as odors and sounds during the operation of the instrument, so that the work can be carried out in a targeted manner.

⑤ Supervise and check whether the instrument users have any violations.

Regular maintenance is planned maintenance of instruments and equipment, generally divided into three levels. Level 1 maintenance can be carried out once a month or once a quarter. In addition to daily maintenance, the content includes removing dust, dirt, and foreign objects from the machine, adding lubricants, checking whether various components are loose, worn, deformed, aged, or broken down, and checking the operation and contact of the power supply and high-voltage components.

Level 2 maintenance is generally carried out once every 0.5 to 1 year. It mainly tests, corrects, and calibrates the sensitivity and accuracy of various instruments and control systems on the main control console, replaces consumables, and performs system detection and testing of the voltage at various test points in the circuit.

Level 3 maintenance is generally carried out once every 2 to 3 years. Depending on the situation, the entire machine can be disassembled for cleaning and repair. Components that have exceeded their service life should be replaced or repaired as much as possible. At the same time, the instruments and equipment should be thoroughly debugged to achieve their original accuracy and performance.

2. Troubleshooting of Instruments and Equipment

Troubleshooting methods for instruments and equipment:

① The instruments and equipment are managed under a responsibility system, specifically assigned to individuals, and simple faults are eliminated in a timely manner. For more complex faults, organize relevant personnel to analyze the faults, formulate effective and feasible solutions, and entrust professional personnel to implement them.

② Fault handling procedure: Clarify the cause of the fault, be familiar with the working principle of the instrument and equipment, analyze and determine the location of the fault, gradually check, and finally repair and replace components, and complete local and overall debugging.

③ Specific practices and principles that should be followed for maintenance: Ask first, then diagnose; observe directly first, then check; comprehensively first, then locally; transmission first, then circuit; external first, then chip; control first, then data; qualitative first, then quantitative; the fault location is usually more mechanical than electrical; high-voltage parts are more than low-voltage parts; high-temperature parts are more than low-temperature parts; power supply parts are more than main body parts; transmission parts are more than stationary parts; plug-in parts are more than fixed parts; resistive components are more than semiconductor components; analog circuits are more than digital circuits.

Fault detection generally uses: visual inspection, measurement, tapping, comparison, replacement, temperature change, signal tracking, signal input, forward and backward tracing, load separation, etc.

3. How to Repair Instruments and Equipment Without Circuit Diagrams

First of all, maintenance engineers must have a certain theoretical level and foreign language foundation, only in this way can the maintenance work be carried out smoothly. Based on years of practical experience, some methods have been explored for reference.

(1) Flowchart analysis method: Based on the flowchart and basic principles of the operation manual, you can generally understand the internal structure, wiring, signal transmission method, and functions of the instrument and equipment, combined with the operation procedures, fault prompts, adjustment methods given in the manual, and the test points given on the circuit board of the instrument and equipment, and cooperate with oscilloscopes and detectors to check the output signals, waveforms, and other data. Through repeated and detailed checks, the repair purpose can be achieved.

(2) Troubleshooting methods: When the instrument malfunctions, do not rush to disassemble the instrument. It should be based on the principle of easy to difficult, outside to inside, step by step. Many faults are caused by vibration, dust, etc., and are manifested as intermittent operation of the instrument and equipment. For this type of fault, contact failure should be considered first, and methods such as dust removal, pressing, tapping, and plugging can be used to find the fault location.

(3) Using the instrument self-check system to troubleshoot: Modern medical imaging instruments and equipment use computer system software programs to detect the working status of the instrument and display the cause of the fault in the form of codes. With the help of this system, it is also relatively easy to find out the fault location and cause and eliminate general faults.

(4) Using oscilloscopes and detectors to find faults: To find faults in instruments and equipment without circuit diagrams, the above two devices must be available to facilitate the search for fault ranges and components, and to achieve component-level maintenance.

4. Summary

Medical imaging diagnostics has become one of the important means of modern disease diagnosis. Acquiring patients' medical images through imaging equipment is an important means of disease diagnosis today. The medical image information acquired and processed by imaging equipment has become an important basis for doctors and experts to diagnose and study diseases. How to comprehensively solve the problems of storage, archiving, statistics, data sharing, management, and communication of image data is particularly important in image management work.

Modern medicine is increasingly dependent on medical equipment. Whether the medical instruments and equipment are operating normally directly affects the medical, teaching, and scientific research work of medical institutions, and is also directly related to the service quality and efficiency of medical institutions. Everyone must pay attention to this.

This information comes from the Internet. Please contact us to delete it if there is any infringement.