MDR Device Classification Guide

MDR Device Classification Guide

EU MDR 2017/745 Annex VIII classification rules and decision framework.

Table of Contents

• Classification Overview
• Classification Rules
• Software Classification (MDCG 2019-11)
• Classification Examples
• Conformity Assessment Routes

Classification Overview

Risk Class Hierarchy

Classification Factors

Determine class based on:

1. Duration of contact:

   • Transient: < 60 minutes
   • Short-term: 60 min to 30 days
   • Long-term: > 30 days

2. Degree of invasiveness:

   • Non-invasive
   • Invasive via body orifice
   • Surgically invasive
   • Implantable

3. Body system interaction:

   • Central circulatory system
   • Central nervous system
   • Other organ systems

4. Active vs. passive:

   • Active devices (energy dependent)
   • Passive devices

Classification Rules

Non-Invasive Devices (Rules 1-4)

Rule 1 - General non-invasive:

• Class I (unless covered by other rules)
• Example: Wheelchairs, hospital beds, collection devices

Rule 2 - Channeling or storing:

• Class IIa: Blood bags, transfusion sets (>60 min contact)
• Class IIb: Blood storage, organ storage
• Class I: Simple channeling (gravity, IV bag without additives)

Rule 3 - Modifying biological composition:

• Class IIa: Filters, gas separators, dialysis filters
• Class IIb: Blood filtration, exchange transfusion

Rule 4 - Contact with injured skin:

• Class I: Wound dressings for superficial wounds
• Class IIa: Wounds in dermis requiring secondary intent healing
• Class IIb: Severe wounds, chronic wounds, burns

Invasive Devices (Rules 5-8)

Rule 5 - Body orifice invasive (transient):

• Class I: Transient use, non-surgically invasive
• Class IIa: Short-term use
• Class IIb: Long-term use in oral cavity

Rule 6 - Surgically invasive (transient):

• Class IIa: Transient use
• Exception Class I: Reusable surgical instruments

Rule 7 - Surgically invasive (short-term):

• Class IIa: Short-term (< 30 days)
• Class IIb: Central circulatory or CNS contact
• Class III: Chemical change or drug delivery

Rule 8 - Implantable and long-term surgically invasive:

• Class IIb: General implants
• Class III: Heart, CNS, spine contact; drug delivery; biological origin

Active Devices (Rules 9-13)

Rule 9 - Active therapeutic devices:

• Class IIa: Exchange or admin of energy (non-hazardous)
• Class IIb: Potentially hazardous energy levels

Rule 10 - Active diagnostic devices:

• Class IIa: Supply energy for imaging, monitoring
• Class IIb: Monitor vital physiological parameters

Rule 11 - Software:

• Class IIa: Information for diagnostic/therapeutic decisions (non-serious)
• Class IIb: Decisions that could cause death/irreversible deterioration
• Class III: Decisions with immediate risk to life
• See MDCG 2019-11 for detailed algorithm

Rule 12 - Active devices administering substances:

• Class IIa: Non-hazardous manner
• Class IIb: Potentially hazardous manner

Rule 13 - Other active devices:

• Class I: All other active devices

Special Rules (Rules 14-22)

Rule 14 - Contraception/STI prevention:

• Class IIb: Contraceptive devices
• Class III: Implantable contraceptives

Rule 15 - Disinfection/sterilization:

• Class IIa: Disinfection of devices
• Class IIb: Disinfection of invasive devices

Rule 16 - X-ray diagnostic recording:

• Class IIa: Recording media for x-ray

Rule 17 - Devices with nanomaterials:

• Class III: High internal exposure potential
• Class IIb: Medium exposure
• Class IIa: Low exposure

Rule 18 - Blood/plasma derivatives:

• Class III: Utilizing blood derivatives

Rule 19 - Drug delivery systems:

• Class III: Integral drug administration

Rule 20 - Breath analyzers for anesthesia:

• Class IIb: Breath analyzers

Rule 21 - Medicinal substance devices:

• Class III: Incorporating medicinal substances

Rule 22 - Closed-loop therapeutic systems:

• Class III: Closed-loop systems

Software Classification

MDCG 2019-11 Decision Algorithm

Execute software classification:

1. Determine if software qualifies as medical device
2. Identify significance of information to healthcare decision
3. Assess healthcare situation or patient condition
4. Apply rule 11 based on severity
5. Validation: Classification rationale documented with MDCG reference

Software Classification Matrix

Software Examples

Classification Examples

Example 1: Surgical Suture (Absorbable)

Device: Absorbable suture for internal wound closure
Analysis:
- Invasiveness: Surgically invasive
- Duration: Long-term (absorbed over > 30 days)
- System: General tissue (not CNS, not cardiac)
- Rule Applied: Rule 8 (implantable, long-term)

Classification: Class IIb
Rationale: Implantable device > 30 days, general tissue
Conformity Route: Annex IX (Type examination) + Annex XI

Example 2: Blood Pressure Monitor

Device: Home blood pressure monitoring device
Analysis:
- Active: Yes (electronic measurement)
- Function: Monitoring vital physiological parameter
- Risk: Non-immediate (home use, not ICU)
- Rule Applied: Rule 10 (active diagnostic)

Classification: Class IIa
Rationale: Monitors vital parameter, non-critical setting
Conformity Route: Annex IX or XI (QMS + product verification)

Example 3: Hip Implant

Device: Total hip replacement prosthesis
Analysis:
- Invasiveness: Surgically invasive, implantable
- Duration: Long-term (permanent)
- System: Musculoskeletal
- Rule Applied: Rule 8 (implantable, long-term)

Classification: Class III
Rationale: Implantable > 30 days in direct contact with bone
Conformity Route: Annex IX + Annex X (full QMS + type examination)

Example 4: Diagnostic Software (AI)

Device: AI-based chest X-ray analysis for pneumonia detection
Analysis:
- Software: Qualifies as medical device (clinical decision)
- Information: Diagnoses condition
- Condition: Serious (pneumonia can be life-threatening)
- Rule Applied: Rule 11 + MDCG 2019-11

Classification: Class IIb
Rationale: Software diagnosing serious condition
Conformity Route: Annex IX or Annex XI

Conformity Assessment Routes

By Device Class

Annex Reference

Decision Workflow

Select conformity route:

1. Determine device classification (Rules 1-22)
2. Identify applicable annexes for class
3. Evaluate QMS maturity (Annex IX capability)
4. Consider production volume (batch vs. mass)
5. Assess Notified Body capacity and timeline
6. Select optimal conformity assessment route
7. Validation: Route confirmed with Notified Body consultation