Preventive maintenance of medical equipment

What preventive maintenance of medical equipment is

Preventive maintenance of medical equipment is scheduled work, such as inspection, cleaning, wear-part replacement, calibration and safety testing, done before a device fails to extend its life and reduce the chance of failure. It matters because a failed ventilator or defibrillator harms patients, and because national rules require hospitals to show the work was planned and done.

The World Health Organization's Medical equipment maintenance programme overview (2011) splits maintenance into inspection and preventive maintenance (IPM) and corrective maintenance (CM). Preventive maintenance aims to extend the life of the equipment and reduce failure rates; corrective maintenance restores the function of a failed device. The Saudi Food and Drug Authority's guidance MDS-G49 uses the same split and describes preventive maintenance as work usually done at scheduled intervals, such as lubrication, filter cleaning and wear-part replacement.

Inspection, preventive and corrective work are different jobs

A plan has to separate three kinds of work because each produces a different record. An inspection is a scheduled performance and safety check; the WHO points out that it only shows the device works at the time of inspection and cannot rule out a later failure. Preventive maintenance changes the device's condition by replacing filters, batteries, seals or tubing before they wear out. Corrective maintenance is unscheduled repair after a fault, which the WHO treats as equivalent to repair.

Calibration and metrological checks sit alongside these: they compare a device's measurement against a reference and adjust or reject it. In Europe the vocabulary for all of this is set by EN 13306:2017, Maintenance terminology. Its definitions are paywalled, but the distinction is the same: preventive work is carried out before failure to reduce the probability of failure or degradation, corrective work after a fault is recognised.

In practice, give each kind of job its own work-order type. Then the reports can show how much time goes into planned work versus breakdowns, which is the first question any review of a maintenance programme asks.

Where the maintenance intervals come from

No single rulebook sets the interval for every device. A defensible plan takes each interval from the most specific source available and records which source it used. The main sources, as of October 2026, are these.

• The manufacturer's instructions for use: the EU MDR, Annex I section 23.4(k), requires them to give the nature and frequency of preventive and regular maintenance, so the IFU is the default starting point.
• Germany: under section 12 of the MPBetreibV 2025, devices in Anlage 1 need a safety check (STK) at least every two years; under section 15, devices in Anlage 2 need metrological checks (MTK) at the annex intervals, for example one year for infrared radiation thermometers and two years for non-invasive blood pressure meters.
• France: decisions of the ANSM director general list the devices subject to the maintenance obligation and to internal and external quality control, and set the periodicity of the controls.
• United States: CMS letter S&C 14-07 lets hospitals depart from the manufacturer's schedule through a documented alternate equipment management (AEM) programme based on a risk assessment by qualified staff, except for equipment where law requires the manufacturer's schedule (such as imaging and radiologic equipment), medical lasers and new equipment without enough maintenance history.
• Saudi Arabia: SFDA guidance MDS-G49 tells maintenance facilities to apply the manufacturer's corrective-maintenance and calibration instructions and, where none exist, to refer to IEC 62353.

Ranking devices by risk

Risk ranking decides which devices get the manufacturer's full schedule, which can be grouped, and which are checked first when the team falls behind. A simple method scores each device type for likelihood of failure and for impact on patients or services, each on a 1 to 5 scale, and multiplies the two. In this illustrative policy, a score of 15 to 25 is high, 8 to 14 medium and 1 to 7 low.

Scoring five device types gives: ventilator, impact 5 x likelihood 3 = 15, high; infusion pump, 4 x 3 = 12, medium; defibrillator, 5 x 2 = 10, medium; patient monitor, 3 x 3 = 9, medium; examination lamp, 1 x 2 = 2, low. The defibrillator result shows why a score alone is not enough. CMS defines critical equipment as biomedical or physical plant equipment whose failure risks serious injury or death, and a sound policy places every life-support device in the high band regardless of its score.

Record the two axes against each asset rather than only the final band. When the likelihood changes, because a model starts failing repeatedly, the score can be recalculated and the plan reviewed without rebuilding the inventory.

Worked example: calculating German STK and MTK due dates

The MPBetreibV counts its two kinds of checks differently, and many plans get the due dates wrong. The STK interval runs to the end of the month of commissioning or of the last STK. The MTK interval runs from the end of the year of commissioning or of the last MTK.

The examples show two practical lessons. Doing an STK early moves every later due date earlier, so batch early checks deliberately. And an MTK done in June buys the rest of that calendar year, so MTK-heavy device groups are easier to plan as an annual campaign.

• STK, infusion pump commissioned 14 March 2025: the count starts at 31 March 2025, so the STK is due at the latest by 31 March 2027.
• STK done early on 9 February 2027: the count restarts at 28 February 2027, so the next STK is due by 28 February 2029.
• MTK, non-invasive blood pressure meter (two-year interval) last checked 10 June 2025: the count starts at 31 December 2025, so the next MTK is due by 31 December 2027.
• MTK, infrared thermometer (one-year interval) last checked 3 November 2025: the count starts at 31 December 2025, so the next MTK is due by 31 December 2026.

Building the plan step by step

A preventive maintenance plan is a list of schedules, one per device or device group, each with a frequency, a task list, a responsible person and a next due date. Building it in this order avoids most rework.

• Start from a verified inventory: every device, its type, serial number, location and owner; nothing can be scheduled that is not listed.
• Rank each device type by risk and mark life-support and critical equipment.
• Set the frequency from the IFU, national rules or a documented risk-based alternative, and note the source on the schedule.
• Write a task list per device type with steps, safety notes, estimated minutes and the measurements to record with their pass limits.
• Assign the work to qualified people: in-house technicians, the manufacturer or a third-party provider under contract.
• Spread the visits across the year so the monthly load is level, then review the plan after the first year using failure and completion data.

Electrical safety testing: IEC 62353 and IEC 60601-1

IEC 60601-1 is the design and type-test safety standard medical electrical equipment is built to. IEC 62353 is the standard for testing that equipment in service: it covers medical electrical equipment and systems that comply with IEC 60601-1, before they are put into service, during maintenance, inspection and servicing, after repair and at recurrent tests. The current edition is IEC 62353:2014 (edition 2.0); the IEC lists its stability date as 2026, so check for a newer edition before quoting one in a procedure.

The test itself is performed with a calibrated safety analyser by qualified staff. What the maintenance system must capture is the evidence: which device was tested, by whom, with which test equipment, the measured values against their limits, the functional test result and a pass or fail. A task list step that requires a measurement with a minimum and maximum limit turns each reading into a checked value rather than a note. Germany's section 7 adds a related duty: after maintenance the operator must check the device's safety-relevant features before it returns to use.

Worked example: a costed sample plan for eight device types

The figures below are illustrative only; real frequencies and times come from the manufacturers' instructions and your own work-order history. The plan needs 584 visits and 540 technician hours a year. At an internal rate of 60 euros an hour, that is 32,400 euros of labour. Adding external MTK for the 100 blood pressure meters on a two-year cycle, 50 meters a year at 25 euros each (1,250 euros), the annual cost of the plan is 33,650 euros, or about 45 technician hours a month.

• Infusion pumps: 240 units x 1 visit x 0.75 hours = 180 hours
• Patient monitors: 80 units x 1 visit x 1.0 hour = 80 hours
• Defibrillators: 30 units x 2 visits x 0.5 hours = 30 hours
• Ventilators: 20 units x 2 visits x 2.5 hours = 100 hours
• Anaesthesia machines: 10 units x 2 visits x 3.0 hours = 60 hours
• Electrosurgical units: 12 units x 1 visit x 1.5 hours = 18 hours
• Non-invasive blood pressure meters: 100 units x 1 visit x 0.4 hours = 40 hours
• Laboratory centrifuges: 8 units x 4 visits x 1.0 hour = 32 hours

After the visit: records, labels and failed checks

A preventive visit is finished when the record is. Under section 12(3) of the MPBetreibV, whoever performs an STK writes a protocol with the date, results, measured values and methods, and labels the device with the year and month of the next check and who performed it. SFDA guidance MDS-G49 similarly asks for a PPM label identifying the maintenance provider. Whatever the country, the record should name the technician, the time spent, the parts replaced, each measured value and the result.

A failed check needs a defined path: the device is taken out of service, a corrective work order is raised and linked to the preventive one, and the device returns to use only after a passing re-test. The WHO calls the share of IPMs that find a problem affecting operation or safety the IPM yield. A high yield on one model suggests the interval is too long; a yield near zero over several years is evidence for a longer interval or a lighter task list.

Measuring whether the plan is delivered

The main measure is the completion rate of scheduled IPM. The WHO suggests a goal above 90 percent, and over 95 percent for the highest-priority devices; these are suggestions, not legal requirements. Before its 2026 restructuring, The Joint Commission's hospital manual required a 100 percent completion rate for scheduled maintenance of high-risk equipment; check the 2026 edition of the manual for the current wording.

In the sample plan, if 551 of the 584 visits are completed in the year, the completion rate is 94.3 percent. Be clear what the report counts: a simple completion ratio counts finished jobs, while an on-time measure counts only jobs finished by their due date, and the two can differ by many points.

Running the plan in Skyline Nexus ERP

In Skyline Nexus ERP, each schedule in PPM Schedules holds the asset, branch, frequency (Daily, Weekly, Monthly, Quarterly, Semi-Annual or Annual), priority, assigned engineer, estimated hours and cost, checklist items, next due date, last completed date and an approval status, and can link to a reusable task list from the Task List Library. Task list steps can require a sign-off, a photo or a measurement with a unit and minimum and maximum limits, which suits electrical-safety and calibration readings taken by your technicians. The Planner gives a calendar view of the plan, and the work order is raised from the schedule when it falls due; Calibration is a work-order type of its own.

The Asset Criticality screen in Skyline Nexus plots each asset's failure likelihood against business impact and lists assets that are not yet scored. Compliance records hold certificate numbers, issue and expiry dates and the next verification date for each asset. The PPM Compliance report shows completed work orders as a share of those raised from each schedule, coloured green at 90 percent and above. Schedules can be exported to Excel or imported in bulk. Start the free month or book a demo to load one device group and see its schedule, work orders and report.