Software Design for Medical Devices That Clears FDA — Not Just Passes Code Review
Software design for medical devices is the structured process of planning, developing, testing, and validating software used in or as a medical device — following IEC 62304, FDA pre-market guidance, and ISO 14971 risk management standards. Whether you are building Software as a Medical Device (SaMD), embedded device firmware, or AI-driven diagnostics, compliant software design is required for FDA 510(k) clearance, CE marking, and global market access. Traccglobal provides end-to-end medical software design consulting for US-based medical device companies — from requirements to regulatory submission.
FDA 510(k) Experts
IEC 62304 Compliant
Full DHF Documentation
USA & Global Markets
Faster Time-to-Market
What Is Software Design for Medical Devices?
Medical device software is not like regular commercial software. A bug in a consumer app crashes your phone. A bug in medical device software can harm a patient. That is why software design for medical devices requires a regulated, documented, and risk-based approach that goes far beyond standard software engineering practices.
The US FDA defines medical device software under two categories: Software in a Medical Device (SiMD) — firmware embedded in a physical device like a ventilator, insulin pump, or imaging system — and Software as a Medical Device (SaMD) — standalone software with a medical purpose, such as AI-based diagnostic tools, clinical decision support, or remote monitoring apps.
Key Insight: The FDA does not treat software like hardware. The FDA assumes that if software can fail, it will fail. This means your software design must plan for failure at every level — with redundancy, isolation of critical functions, and a fully traceable risk management file.
Proper medical device software design covers the entire software lifecycle: from initial planning and requirements analysis, through architecture, coding, and unit testing, to system-level verification, validation, regulatory submission, and post-market maintenance.
Quick Reference: Key Terms
- IEC 62304 International standard for medical device software lifecycle processes. Recognized by FDA and EU regulators worldwide.
- SaMD Software as a Medical Device — standalone software with a diagnostic or therapeutic purpose (e.g., AI diagnostic apps).
- SiMD Software in a Medical Device — embedded firmware inside a physical device, inheriting the device's safety class.
- DHF Design History File — the complete regulatory record of all software design and development decisions.
- Safety Class A / B / C IEC 62304 classifies software by patient risk level. Class C (risk of death) requires the most rigorous development controls.
- V&V Verification & Validation — confirming software is built correctly (verification) and does what it should (validation).
Why Getting Medical Device Software Design Right Matters More Than Ever
FDA rejections due to inadequate software documentation are one of the top reasons US medical device submissions get delayed. In 2026, AI/ML in medical devices, cybersecurity requirements, and updated FDA guidance have raised the bar significantly.
FDA 510(k) & PMA Requirements
The FDA's Guidance for the Content of Premarket Submissions for Device Software Functions (2023) requires software documentation including architecture, hazard analysis, and a full cybersecurity bill of materials (SBOM) for connected devices.
IEC 62304 & FDA Alignment
Declaring conformance with IEC 62304 in your 510(k) submission can significantly reduce documentation requirements. FDA explicitly recognizes it as an accepted consensus standard for software lifecycle processes.
AI/ML in Medical Devices
The FDA's 2024 AI/ML action plan introduced new requirements for "Predetermined Change Control Plans" for AI-based devices. If your device uses machine learning, your software design must address adaptive algorithm documentation.
Cybersecurity Now Mandatory
The Consolidated Appropriations Act of 2023 made cybersecurity documentation a statutory requirement for new device submissions. Your software design must include threat modeling, SBOM, and a post-market cybersecurity plan from day one.
CE Marking & Global Access
EU MDR 2017/745 treats software as a medical device when it has a medical purpose. Proper IEC 62304-compliant software design is required for CE marking and accessing European, UK, and Canadian markets alongside the US FDA.
Cost of Getting It Wrong
The infamous Therac-25 radiation therapy machine — a landmark case in software safety — caused patient deaths due to race conditions in poorly designed software. Today, a software failure can mean FDA warning letters, device recalls, and multi-million dollar liability.
Our End-to-End Software Design Process for Medical Devices
Traccglobal follows a structured, IEC 62304-aligned software development lifecycle that integrates regulatory documentation at every stage — not as an afterthought, but as part of the development workflow itself.
Software Development Planning & Safety Classification
We begin by defining the intended use, classifying your software under IEC 62304 (Class A, B, or C), and creating a Software Development Plan (SDP). This document defines roles, tools, development methodology (including Agile integration), and how FDA and IEC 62304 requirements will be met throughout the project. Getting this step right avoids costly rework later.
Software Requirements Analysis
We work with your engineering and clinical teams to define every software requirement — functional, performance, interface, usability, and security. Requirements are documented in a Software Requirements Specification (SRS) and must be traceable to system-level specs. Every requirement gets a verification method — if it cannot be tested, it is not a valid requirement.
Software Architecture & Detailed Design
The architecture phase defines the high-level software structure — identifying partitions for safety-critical functions, interface specifications between software units, and segregation of high-risk components. We create the Software Architecture Description (SAD) and Software Design Specification (SDS), both required for FDA submissions and IEC 62304 compliance.
Risk Management Integration (ISO 14971)
Unlike ISO 14971 which evaluates probability of harm, IEC 62304 assumes software will fail and focuses on consequences. We integrate software-specific hazard analysis into your risk management file, identifying software failure modes, causes, effects, and mitigation strategies. Risk controls are then verified through testing — closing the loop on every identified hazard.
Verification, Validation & Testing
We develop and execute unit tests, integration tests, system tests, and user acceptance testing — with full traceability back to requirements. Our V&V protocols and reports are written to satisfy FDA reviewers, not just engineering teams. For SaMD, we conduct clinical validation studies to demonstrate real-world effectiveness. We also support usability testing under IEC 62366 for human factors compliance.
Cybersecurity Design & SBOM
For connected medical devices, we implement cybersecurity requirements from the design phase — including threat modeling, penetration testing, vulnerability management, and a complete Software Bill of Materials (SBOM). This directly supports the FDA's 2023 cybersecurity statutory requirements and prepares you for post-market security updates.
Design History File (DHF) & Regulatory Submission
All software design artifacts are compiled into a complete Design History File (DHF) that tells the full story of your software development — from requirements to testing to release. We prepare the FDA pre-market submission software documentation section and support your 510(k), De Novo, or PMA submission with response management if FDA issues additional information requests.
Medical Software Design Services by Traccglobal
Whether you are a startup developing your first SaMD or an established manufacturer updating embedded device software, Traccglobal provides the right level of support for your project.
IEC 62304 Gap Analysis & Compliance Roadmap
We audit your existing software development processes against IEC 62304 requirements, identify gaps, and deliver a prioritized compliance roadmap so you know exactly what to fix before an FDA submission or notified body audit.
Software Architecture & Design Documentation
We develop FDA-submission-ready software architecture descriptions and design specifications — including system block diagrams, interface definitions, SOUP component lists, and security architecture documentation.
Design History File (DHF) Preparation
We compile and organize your complete DHF — ensuring all software design and development records are traceable, complete, and formatted to satisfy FDA 21 CFR Part 820 design control requirements.
Verification & Validation (V&V) Support
We write V&V protocols, execute testing activities, generate test reports, and establish traceability matrices that link every software requirement to its verification evidence — ready for FDA review.
Software Risk Management (ISO 14971)
We integrate software-specific hazard analysis into your ISO 14971 risk management file, documenting software failure modes, their causes, consequences, and implemented risk controls with verification evidence.
AI/ML SaMD Regulatory Strategy
We help you navigate the FDA's evolving AI/ML framework — including Predetermined Change Control Plans (PCCPs), transparency requirements, and clinical performance validation for AI-based diagnostic or therapeutic software.
Medical Device Cybersecurity
We implement the FDA's cybersecurity guidance for pre-market submissions — including threat modeling, vulnerability assessment, SBOM creation, and post-market patch management planning for connected devices.
US FDA Registration for SaMD
We manage the end-to-end FDA 510(k) clearance process for Software as a Medical Device — from pre-submission meetings to final clearance, with full software documentation support.
From Rejected Submission to FDA Clearance in 11 Months
Case Study — Cardiac Monitoring SaMD
Class II Cardiac Arrhythmia Detection Software — 510(k) Clearance
A US-based medical device startup approached Traccglobal after receiving an FDA “Refuse to Accept” (RTA) decision on their 510(k) submission for an AI-powered cardiac arrhythmia detection app. The FDA’s primary concerns: insufficient software documentation, no IEC 62304 conformance declaration, and missing cybersecurity documentation for the cloud-connected device.
Traccglobal performed a complete IEC 62304 gap analysis, reconstructed the Software Architecture Description and Software Design Specification, built a traceable requirements traceability matrix, and developed a cybersecurity file including threat model and SBOM. We integrated software-specific risk controls into the existing ISO 14971 risk management file and rewrote the software section of the 510(k) submission to align with FDA’s 2023 pre-market software guidance.
Result: The revised 510(k) submission was accepted within 21 days (no RTA), and the device received FDA clearance 11 months after Traccglobal’s engagement began — with no additional information (AI) requests from FDA during substantive review.
11
Months to FDA Clearance
0
FDA AI Requests During Review
21
Days to RTA Acceptance
100%
IEC 62304 Coverage Achieved
Standards & Regulations We Work With
Complete, up-to-date expertise across every standard relevant to medical device software design — for US FDA, EU CE marking, and global market access.
IEC 62304
Medical Device Software Lifecycle Processes
ISO 14971
Risk Management for Medical Devices
ISO 13485
Quality Management Systems for Medical Devices
IEC 62366
Usability Engineering for Medical Devices
21 CFR 820
FDA Quality System Regulation — Design Controls
FDA 2023
FDA Pre-Market Software Guidance (Device Software Functions)
AAMI TIR45
Agile Methods for Medical Device Software Development
IEC 81001-5-1
Health Software Cybersecurity Lifecycle
Medical Device Companies We Work With
Traccglobal serves the full range of US medical device companies that need expert medical software design support — from first-time SaMD developers to large OEMs updating legacy device software.
Startups & Early-Stage Companies
Building your first SaMD or connected device? We help you design software the right way from day one — avoiding the costly rework of retrofitting compliance.
Established Manufacturers
Updating existing device software, adding connectivity, or adding AI/ML features? We help you manage design changes under IEC 62304 and FDA change control requirements.
AI & Digital Health Companies
Developing an AI diagnostic tool, clinical decision support system, or remote patient monitoring app? We navigate FDA's AI/ML SaMD framework for you.
IVD & Diagnostic Software
In vitro diagnostic software has its own regulatory pathway. We support IVD software design under FDA 21 CFR Part 809 and IEC 62304 requirements.
Frequently Asked Questions About Software Design for Medical Devices
These are the questions US medical device teams most commonly ask when starting a software design for medical devices project. Answers are written for Google People Also Ask and AI Overview compatibility.
What standard governs software design for medical devices?
What is the difference between SaMD and SiMD?
Does the FDA require IEC 62304 compliance for medical device software?
What are the three safety classes in IEC 62304?
Class A — No injury or health damage is possible. Minimal documentation and testing requirements. Example: administrative hospital software with no patient data impact.
Class B — Non-serious injury is possible. Requires documented requirements, architecture, and unit testing. Example: monitoring software with alert thresholds.
Class C — Serious injury or death is possible. Requires the most rigorous design controls, full traceability, and comprehensive testing. Example: software controlling drug delivery or radiation therapy.
Misclassifying your software — especially underestimating risk — is one of the most common causes of FDA audit findings and device recalls.
How long does software design and FDA validation for a medical device take?
What documentation is required for medical device software under FDA?
For an FDA pre-market submission, required software documentation typically includes:
• Software Requirements Specification (SRS) — complete functional and non-functional requirements
• Software Architecture Description (SAD) — system design with security and safety partitioning
• Software Design Specification (SDS) — detailed design of software units
• Risk Management File (ISO 14971) with software-specific hazard analysis
• V&V Protocols and Reports — test plans and results for all safety requirements
• Traceability Matrix — linking requirements → design → tests → results
• Software Bill of Materials (SBOM) — required for connected devices since 2023
• Cybersecurity Documentation — threat model, vulnerability management plan
• Design History File (DHF) — the complete record of all the above
Traccglobal creates and assembles all of this documentation as part of our medical software design service.
Can Agile development be used for medical device software?
Ready to Build FDA-Compliant Medical Device Software?
Talk to a Traccglobal expert today. We’ll review your project, identify your compliance gaps, and give you a clear path to FDA clearance — for free.