The Complizen blog

Notes from the FDA frontier.

153 posts and counting — every CDRH guidance, warning letter, and explainer worth your time.

Showing 97–120 of 153
Submissions
Jul 2, 2025 · ~8 MIN

What Is an FDA Pre-Submission (Q-Sub)? Complete Guide

Learn when FDA Q-Submissions provide ROI for medical device approvals. Complete guide to Pre-Subs, timing strategy, eSTAR requirements & maximizing FDA feedback value.

Pathways
Jul 1, 2025 · ~8 MIN

Humanitarian Device Exemption (HDE): Complete FDA Guide

Learn FDA's Humanitarian Device Exemption (HDE) pathway for rare disease devices affecting ≤8,000 patients. Complete guide to HUD designation, profit restrictions & IRB requirements.

Pathways
Jul 1, 2025 · ~8 MIN

Humanitarian Device Exemption (HDE): Complete FDA Guide

Learn FDA's Humanitarian Device Exemption (HDE) pathway for rare disease devices affecting ≤8,000 patients. Complete guide to HUD designation, profit restrictions & IRB requirements.

Pathways
Jun 26, 2025 · ~8 MIN

What Is an IDE? FDA Investigational Device Exemption Complete Guide

Learn when you need FDA Investigational Device Exemption (IDE) for clinical studies. Complete guide to significant risk vs nonsignificant risk devices & approval process.

Pathways
Jun 26, 2025 · ~8 MIN

What Is an IDE? FDA Investigational Device Exemption Complete Guide

Learn when you need FDA Investigational Device Exemption (IDE) for clinical studies. Complete guide to significant risk vs nonsignificant risk devices & approval process.

Pathways
Jun 25, 2025 · ~8 MIN

What Is FDA's Breakthrough Devices Program? Complete Guide

FDA's Breakthrough Devices Program expedites review by 6-12 months for qualifying medical devices. Learn eligibility requirements, benefits & application strategy.

Pathways
Jun 25, 2025 · ~8 MIN

What Is FDA's Breakthrough Devices Program? Complete Guide

FDA's Breakthrough Devices Program expedites review by 6-12 months for qualifying medical devices. Learn eligibility requirements, benefits & application strategy.

Software, AI & SaMD
510(k)
Jun 24, 2025 · ~8 MIN

Top Reasons SaMD 510(k)s Get AI Letters (and How to Fix Them)

Discover why SaMD 510(k) submissions fail. Cybersecurity gaps, AI/ML validation issues & predicate problems leading 2025 rejections. Expert analysis.

Pathways
De Novo
Jun 23, 2025 · ~8 MIN

FDA De Novo Pathway Explained: The Complete Guide

Master the FDA De Novo pathway for novel medical devices. Learn costs, timelines, eligibility criteria & success strategies. Complete guide.

Pathways
PMA
Jun 20, 2025 · ~8 MIN

Pre-market Approval (PMA) Explained: The Complete Guide

Learn what PMA premarket approval is, when medical devices need PMA, and how the FDA approval process works. Complete guide.

Pathways
510(k)
Jun 19, 2025 · ~8 MIN

FDA 510(k) Clearance Explained: How It Works (Complete Guide)

Learn about FDA 510(k) clearance and how it works. Our complete guide simplifies the FDA 510(k) process for medical device approval.

Software, AI & SaMD
SaMD
Jun 17, 2025 · ~8 MIN

SaMD vs SiMD: Quick Comparison for Medical Devices

Learn the critical differences between SaMD and traditional medical device software, FDA classifications, and regulatory pathways in 2025.

Market Entry & Strategy
AI
Jun 16, 2025 · ~8 MIN

The Gentle Singularity in Life Sciences: What Sam Altman's AI Timeline Means for Medical Innovation

Sam Altman just released "𝘛𝘩𝘦 𝘎𝘦𝘯𝘵𝘭𝘦 𝘚𝘪𝘯𝘨𝘶𝘭𝘢𝘳𝘪𝘵𝘺": his take on where AI stands today and where it's headed. This article breaks all that down and how it impact life sciences.

Pathways
510(k)
Jun 12, 2025 · ~8 MIN

510(k) vs De Novo vs PMA: How to Choose the Right Pathway Complete Guide

Confused between 510(k), De Novo, or PMA? This guide breaks down each FDA pathway—timelines, costs, risks, and how to choose the right one.

Software, AI & SaMD
AI
Jun 12, 2025 · ~8 MIN

Good Machine Learning Practice (GMLP): What It Is & Who Must Follow It

Discover FDA’s GMLP framework for SaMD—key principles, lifecycle steps, and who must comply.

Testing & Evidence
SaMD
Jun 10, 2025 · ~8 MIN

Clinical Evidence for SaMD: Valid Association, Analytical & Clinical Validation

Learn how to design and structure clinical evidence for SaMD—study types, endpoints, reporting formats.

Testing & Evidence
Jun 5, 2025 · ~8 MIN

FDA Software Validation: What Evidence to Show Complete Guide

Discover the precise software validation evidence FDA requires for SaMD—test plan, code coverage, risk-based testing, and automated checks.

Testing & Evidence
Jun 5, 2025 · ~8 MIN

FDA Software Validation: What Evidence to Show Complete Guide

Discover the precise software validation evidence FDA requires for SaMD—test plan, code coverage, risk-based testing, and automated checks.

Software, AI & SaMD
SaMD
Jun 3, 2025 · ~8 MIN

Documenting AI-Enabled SaMD: What FDA Expects

Learn how to document your AI/ML model for SaMD per FDA’s January 2025 draft: required sections, data lineage, performance metrics, and PCCP examples.

Software, AI & SaMD
SaMD
Jun 3, 2025 · ~8 MIN

Documenting AI-Enabled SaMD: What FDA Expects

Learn how to document your AI/ML model for SaMD per FDA’s January 2025 draft: required sections, data lineage, performance metrics, and PCCP examples.

Software, AI & SaMD
SaMD
May 29, 2025 · ~8 MIN

FDA SaMD Cybersecurity: §524B, SBOM, Testing & eSTAR Complete Guide

Learn FDA’s cybersecurity requirements for SaMD: SBOM, threat modeling, secure design, and validation.

Software, AI & SaMD
SaMD
May 29, 2025 · ~8 MIN

FDA SaMD Cybersecurity: §524B, SBOM, Testing & eSTAR Complete Guide

Learn FDA’s cybersecurity requirements for SaMD: SBOM, threat modeling, secure design, and validation.

Software, AI & SaMD
SaMD
May 27, 2025 · ~8 MIN

IEC 62304 + ISO 14971 for SaMD: How to Integrate Lifecycle & Risk

Learn how to align IEC 62304 software lifecycle processes with ISO 14971 risk management for FDA-compliant SaMD development.

Submissions
SaMD
May 22, 2025 · ~8 MIN

FDA SaMD Pre-Submission (Q-Sub): When to Request & What to Include

Learn when to schedule an FDA Pre-Submission meeting for your SaMD project, key benefits, required documents.