# MDCG 2019-11 — Qualification and Classification Analysis

## Step 1: Is MADDENING a Medical Device?

**No.** MADDENING is a general-purpose computational framework.

Per MDCG 2019-11 Section 3.2, software that is a "general purpose computing platform" or "general purpose scientific tool" is not a medical device. MADDENING falls squarely in this category:

- It computes physics simulations (heat diffusion, fluid dynamics, rigid body mechanics)
- It provides infrastructure (graph management, coupling, differentiation, surrogates)
- It does not process patient data
- It does not make clinical predictions
- It does not have a medical intended purpose
- It has no specific clinical claim

MADDENING is comparable to MATLAB, NumPy, FEniCS, or OpenFOAM — tools that can be *used in* medical device software but are not themselves medical devices.

**EU MDR Article 2(1) analysis**: A medical device must have a "specific medical purpose." MADDENING has no medical purpose — it is a physics simulation framework. The fact that downstream tools *may* use MADDENING for clinically relevant simulation does not make MADDENING itself a medical device, just as MATLAB is not a medical device because it is used in medical device development.

## Step 2: How Would a Downstream Product Be Classified?

When a downstream commercial entity builds a regulated product on MADDENING:

| Intended Use Mode | Rule 11 Analysis | EU MDR Class | IMDRF Category |
|---|---|---|---|
| Research / pre-clinical simulation | Not a medical device (no clinical intended purpose) | N/A | N/A |
| Intraoperative digital twin (surgical decision support) | Rule 11(b): "intended to provide information which is used to take decisions with diagnosis or therapeutic purposes" + potential for irreversible neurological harm | **Class IIb minimum, likely Class III** | III–IV |
| RL policy generation for microrobot control | Rule 11(c): "intended to monitor physiological processes" in active control loop for CNS device | **Class III** | IV |

## IMDRF SaMD Risk Framework Alignment

| IMDRF Factor | Assessment |
|---|---|
| Significance of information | Treat/Diagnose (for intraoperative use) |
| State of healthcare situation | Critical (CNS, irreversible harm possible) |
| → IMDRF Category | **IV** (highest risk) |

This IMDRF Category IV maps to EU MDR Class III per MDCG 2019-11 Table 3.