Embedded Systems

Embedded systems are dedicated computing units, combining a processor, firmware, and supporting electronics, built into a larger product to control specific functions. In medical devices, an embedded system runs the real-time software that drives sensing, actuation, alarms, and user interfaces inside instruments such as infusion pumps, ventilators, and patient monitors.

What are embedded systems?

An embedded system is a computer designed for one job, or a small set of jobs, rather than general-purpose use. It pairs a microcontroller or microprocessor with memory, sensors, actuators, and firmware: the low-level software written to run directly on that hardware.

In a medical device, the embedded system sits at the center of the medical device product architecture. It reads sensor signals, applies control logic, drives motors or pumps, manages displays, and raises alarms when readings exceed a threshold. When that software performs a medical function, it falls within the definition of software in a medical device (SiMD) and is regulated accordingly.

Why embedded systems matter in medical device development

In a regulated device, embedded software is often the part that can hurt a patient fastest. A timing fault in a ventilator’s control loop or a miscalculated dose in an infusion pump can cause harm before anyone notices.

The consequences are concrete. Software defects are a leading root cause of device recalls, and embedded firmware bugs have triggered field corrections, injuries, and deaths. A weak software lifecycle also raises audit exposure, since FDA investigators and EU notified bodies review design records and often find gaps in software documentation.

How embedded systems are built under medical device standards

Embedded development in MedTech operates within a structured software lifecycle. The governing standard is IEC 62304, which defines lifecycle processes for medical-device software, including software embedded within or integral to a physical device. It assigns software to safety classes A, B or C according to the harm that a failure could cause.

Core activities include:

• Software planning and requirements are traced back to user needs and system inputs.
• Architectural and detailed design, including how the embedded system partitions safety-critical functions.
• Implementation and unit, integration, and system testing with documented results.
• Risk management under ISO 14971, linking each software hazard to a control.
• Configuration management and controlled software changes: ensuring every firmware version, defect, correction and released change remains identifiable, reviewed and traceable throughout the product lifecycle.

These activities sit alongside companion standards: ISO 14971 for risk management, IEC 60601-1 for the electrical safety and essential performance of the equipment on which the firmware runs, and IEC 81001-5-1 for cybersecurity. These operate within an ISO 13485 quality system. In the United States, that system now falls under the FDA Quality Management System Regulation, which incorporates ISO 13485:2016 by reference. Embedded device software placed on the European market must also satisfy EU MDR 2017/745.

Common challenges and best practices

A frequent mistake is treating embedded code as ordinary software and skipping the traceability that auditors expect. Every requirement should map to a test, and every test result should be on file. Teams that defer documentation pay for it at submission.

Software of unknown provenance (SOUP), such as a real-time operating system or an open-source library, is another weak point. IEC 62304 requires you to identify each SOUP item and assess its risk, yet many teams cannot list what is actually running in their firmware. Cybersecurity is the third gap: an embedded device on a hospital network is an attack surface, and security controls now have to be designed in, not patched later. Good practice means setting the safety class early and building risk and security analysis into the design.

How SJML helps with embedded systems

Syrma Johari MedTech designs electromechanical medical devices end-to-end, with embedded systems as a core discipline alongside mechanical, electronics, software, and systems engineering. Its teams take programs from concept and feasibility through architecture, embedded software development, verification, design transfer, and scalable manufacturing. Risk management under ISO 14971 and usability engineering under IEC 62366-1 are integrated into the workflow, while in-house laboratories support electrical safety, EMC and reliability testing.

For software-driven and connected devices, SJML’s QARA team supports software and cybersecurity compliance, including IEC 62304 lifecycle alignment and cybersecurity risk assessment under IEC 81001-5-1.

Frequently asked questions