Service life is the period, defined by the manufacturer, during which a medical device is expected to remain safe and perform as intended under normal use and specified maintenance. IEC 60601-1 calls this the expected service life, and EU MDR 2017/745 frames it as the device lifetime tied to risk management.
What is service life in a medical device?
Service life, often written as expected service life (ESL), is the time span a manufacturer assigns to a device as the window in which it stays safe and keeps meeting its essential performance. It sits in the use phase of the product lifecycle, after design transfer and market release, and it ends at decommissioning or replacement.
It is not the same as shelf life, which covers how long a device or its sterile packaging stays usable before first use. Service life is also narrower than the full life cycle, which runs from concept through disposal. The distinction matters because each one is supported by different evidence and different standards.
Why Service Life matters in medical device development
A stated service life is a regulatory anchor, not a marketing number. Under IEC 60601-1, the manufacturer must define the expected service life because it is a precondition for showing compliance with several safety clauses, including durability of markings, protective earthing of moving parts, and mechanical strength. If the device claims a longer life than its design can support, those compliance arguments weaken.
EU MDR 2017/745 reinforces this. General Safety and Performance Requirement 6 in Annex I states that a device’s characteristics and performance must not degrade to the point of harming patients or users across the lifetime the manufacturer indicates when the device is used normally and maintained per instructions. So the number you write becomes a claim a notified body can audit.
The cost side is just as real. Set the figure too short, and you invite early obsolescence, replacement expense, and avoidable revalidation. Set it too long, and you risk field failures, complaints, and vigilance reporting once parts wear out sooner than promised.
How manufacturers establish service life
Defining a defensible service life is an evidence exercise, not a guess. A typical path includes:
- Define the intended use, user, and use environment, including duty cycle and expected handling.
- Identify the failure and wear mechanisms that limit life: mechanical fatigue, battery capacity loss, connector mating cycles, seal degradation, and material aging.
- Test against those mechanisms using reliability methods and accelerated life testing, then support the claim with that data.
- Apply risk management under ISO 14971 so that risk control measures stay effective for the whole period, not just at release.
- Specify the maintenance, calibration, and, for reusable devices, the reprocessing and reuse limits that the life claim depends on.
- Record the rationale in the design history file or technical documentation, and reflect it in labeling.
The quality system that holds this together is ISO 13485, now also reflected in the FDA Quality Management System Regulation (21 CFR Part 820), which, since February 2, 2026, incorporates ISO 13485:2016 by reference. For software-driven devices, IEC 62304 and the cybersecurity expectations in IEC 81001-5-1 extend the question to how long the software will be supported.
Common challenges and best practices
The most frequent error is treating service life as a round figure copied from a similar product. A claim of five years carries no weight without test data and a wear analysis behind it. Reviewers ask for the rationale, and “industry norm” is rarely enough on its own.
Teams also blur service life and shelf life, then apply the wrong tests to each. Another gap is software: a device may be mechanically sound for a decade while its operating system or security patches lapse far sooner, which effectively shortens usable life.
Good practice ties the claim to evidence, keeps maintenance instructions consistent with it, and plans for obsolescence of components before they reach end of life. Post-market surveillance data should feed back into the estimate, so the next revision reflects real field behavior rather than the original assumption.
How SJML helps with Service Life
Syrma Johari MedTech supports service life claims on both the engineering and lifecycle sides. Its in-house labs run reliability, environmental, and endurance testing, alongside IEC 60601 electrical safety testing, to generate the data a life claim needs. Risk management to ISO 14971 is built into the design process, so risk controls are assessed across the intended period rather than at launch alone. On the sustaining side, SJML offers obsolescence management, supplier qualification, and change governance meant to limit revalidation burden as components age, helping teams keep a device safely in service and reduce total cost of ownership.
Talk to SJML’s engineering team →
Frequently asked questions
Service life is the period a device stays safe and functional during active use, set by the manufacturer and supported by reliability data. Shelf life is the maximum time a device, or its sterile barrier, can be stored before first use without losing performance or sterility. A single device often carries both, validated through separate testing.
The manufacturer sets it. IEC 60601-1 requires the maker of medical electrical equipment to define the expected service life as part of risk management, and EU MDR 2017/745 expects a stated device lifetime. Notified bodies and, where applicable, the FDA review the claim, but the duty to determine and justify it rests with the manufacturer.
It is determined from analysis and testing, not assumption. Engineers identify the mechanisms that limit life, such as fatigue, battery loss, or wear, then run reliability and accelerated life testing to confirm the device holds up for the claimed period. ISO 14971 risk management and the documented maintenance schedule support the figure recorded in the technical file.
It can. A device may stay mechanically sound while its software support, security patching, or third-party operating system reaches the end of support sooner. IEC 62304 and IEC 81001-5-1 frame how long software is maintained, so service life planning for connected or software-driven devices should account for the support window, not only the hardware.
Related terms
- End of Life (EOL)
- Obsolescence Management
- Lifecycle Management
- Shelf Life
- Reliability Testing
