A Comprehensive Look At Toxicological Assessment In Medical Devices

Medical devices are composed of diverse materials polymers, metals, coatings, and additives that may interact with the human body over time. These interactions can lead to the release of chemical substances, making toxicological assessment a critical component of device safety evaluation.

Global regulators such as the U.S. Food and Drug Administration and frameworks like EU MDR 2017/745 increasingly emphasize risk-based, science-driven toxicological evaluations.

With growing device complexity and longer patient exposure durations (e.g., implants), toxicology is no longer optional it is central to regulatory approval and lifecycle safety management.

What is toxicological assessment in medical devices?
Toxicological assessment evaluates chemical substances released from medical device materials to determine potential health risks. Under ISO 10993, it combines chemical characterization, exposure estimation, and risk analysis to ensure patient safety and regulatory compliance.

What Is Toxicological Assessment?

Toxicological assessment is a structured evaluation process defined under ISO 10993-1.

It involves:

• Identifying extractable and leachable chemicals 
• Evaluating toxicological hazards 
• Estimating patient exposure levels 
• Determining whether risks are acceptable within defined safety thresholds 

It is applicable across all device categories from short-term contact devices to permanent implants.

Why Toxicological Assessment Matters

Chemical exposure from devices can result in a range of biological effects depending on dose, duration, and route of exposure.

Types of Toxicological Risks

Understanding these risks enables manufacturers to design safer devices and avoid adverse patient outcomes.

Core Components of Toxicological Risk Assessment

Toxicological assessment follows a stepwise, evidence-based approach:

1. Material Characterization

As per ISO 10993-18

• Identifies chemical constituents released under simulated use conditions 
• Includes extractables (worst-case) and leachables (actual use) 
• Uses advanced analytical tools: 
  • GC-MS 
  • LC-MS/MS 
  • ICP-MS 

2. Toxicological Data Review

Data is sourced from globally recognized databases such as:

• International Agency for Research on Cancer 
• European Chemicals Agency 

Evaluated Endpoints Include:

• LD50 (acute toxicity) 
• NOAEL (No Observed Adverse Effect Level) 
• CMR classification (Carcinogenic, Mutagenic, Reprotoxic) 

3. Exposure Estimation

Exposure is calculated using:

• Device contact type (skin, blood, tissue) 
• Duration (limited, prolonged, permanent) 
• Frequency of use 
• Surface area and release kinetics 

4. Risk Characterization

The final step compares exposure levels with safety thresholds such as:

• Tolerable Intake (TI) 
• Permitted Daily Exposure (PDE) 

A Margin of Safety (MoS) is calculated to determine acceptability.

Key Steps and Outputs

Regulatory Frameworks & Standards

Toxicological assessments must align with international regulatory expectations:

Global Standards Overview

Advanced Toxicological Approaches

Modern toxicology is evolving beyond traditional testing:

In Silico Toxicology

• QSAR models predict toxicity based on chemical structure 
• Threshold of Toxicological Concern (TTC) reduces testing burden  

Weight-of-Evidence Approach

• Combines multiple data sources 
• Supports scientifically justified conclusions 

Read-Across Techniques

• Uses data from similar compounds 
• Reduces need for new testing 

Maven Scientific Laboratories: Toxicology Expertise

Maven delivers comprehensive toxicological solutions:

Core Services

• Extractables & leachables studies 
• In silico toxicology (QSAR, TTC) 
• TI/PDE derivation by certified toxicologists 
• Risk assessment and mitigation strategies 
• Regulatory documentation for global submissions 

Why Maven

• Certified experts (ERT, DABT, BTS) 
• Strong regulatory track record 
• Integrated scientific and regulatory approach 

Best Practices for Manufacturers

Emerging Trends in Toxicological Assessment

• Computational Toxicology → Faster, predictive assessments 
• Reduction in Animal Testing → Ethical, cost-effective methods 
• Endocrine Disruptor Focus → Increasing EU scrutiny 
• Green Chemistry → Safer materials by design 

Quick Facts 

• Part of ISO 10993 biocompatibility framework 
• Focuses on chemical safety and exposure risk 
• Uses extractables & leachables data 
• Aligns with FDA and EU MDR expectations 
• Reduces need for animal testing 

Ensure Safe & Compliant Medical Devices

Partner with Maven Scientific Laboratories for advanced toxicological risk assessment and regulatory success

1. Protect patient safety
2. Ensure global compliance
3. Accelerate time-to-market

Conclusion

Toxicological assessment is a cornerstone of medical device safety and regulatory compliance. As regulatory expectations evolve and devices become more complex, manufacturers must adopt a proactive, data-driven, and lifecycle-based toxicology strategy.

By integrating chemical analysis, exposure science, and risk evaluation, organizations can confidently deliver safe, effective, and compliant medical devices to global markets.

FAQs 

1. What is toxicological assessment?
Evaluation of chemical risks from medical device materials.

2. Which standards govern it?
ISO 10993 series, especially ISO 10993-17 and -18.

3. What are extractables and leachables?
Chemicals released from device materials.

4. How is safety determined?
By comparing exposure to TI or PDE limits.

5. Can animal testing be avoided?
Partially, using in silico and analytical approaches.

6. How can Maven help?
By providing end-to-end toxicology and regulatory support.