1、 Basic concepts of preventive protection
Preventive protection refers to a series of protective measures taken periodically to maintain medical equipment in the best operating condition. Specific measures include checking, testing, and adjusting system operation functions, conducting electrical safety tests, cleaning external and internal dust removal of equipment, smoothing mechanical components, and replacing vulnerable parts.
2、 Intention and meaning
（1） Intention of preventive protection
From the concept of preventive protection, we can conclude that the intention of preventive protection is to minimize the failure rate and practical depreciation rate of equipment, while maximizing the availability and reliability of equipment throughout its entire service life.
（2） The meaning of preventive protection
The change in the defect rate of medical equipment can generally be divided into three periods: early defect period, occasional defect period, and wear and tear defect period. These three periods summarize and reflect the defect characteristics of the entire life cycle of the equipment from input and use to scrapping and stopping. The period changes into a certain rule, which is generally referred to as the bathtub curve.
Combining the concept of preventive protection with changes in equipment failure rates, we have summarized the following positive implications of preventive protection operations:
1. It effectively reduces the failure rate of equipment during the morning failure period and the wear and tear period, reduces the amount of repair work, and then reduces the repair costs during equipment operation. It also reduces losses caused by downtime for maintenance due to problems, playing a preventive role.
2. Limited extension and occasional malfunction periods, as well as extended equipment service life.
3. Improve the safety and quality of equipment use to ensure the safety of patients and users.
4. Ensure that the equipment is in the best working condition, improve equipment integrity, and maximize its performance.
5. Reduce the occurrence of erroneous operations by personnel and timely collect reaction information during equipment use, strengthening communication between clinical medical engineering and technical personnel and clinical department users.
6. Improved the ability of medical engineering to automatically serve clinical needs, as well as the planning and automation of operations, and also enhanced the management level of medical engineering and the ability to ensure medical equipment.

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