Risk-Based interface design & dfmea

From speculation to predictability

Enhanced patient safety isn’t just about strong testing - it comes from robust interfaces and risk management that goes beyond qualitative judgement. RD8 brings quantitative methods and traceability into risk assessment, turning documentation into real design control.

Talk to an expert today

3D CAD transparent model of a piston rod and piston hook assembly with interface analysis constraints displayed on the left panel.

Home

Drug Delivery

Interface Design & Risk Assessment Tools

The problem

In regulated processes, risk management is often qualitative and documentation-heavy. That creates dependency on individual risk experts and weakens the link to specifications. The result: limited impact, missed interactions, and unclear traceability.

Three key challenges:

Risk assessments depend too heavily on expert opinion and does not get done early enough.

Mechanical interactions at interface level are easily overlooked.

Specifications and mitigations are poorly linked to actual risk controls.

RD8’s quantitative approach to risk assessment and interface risk

Table illustrating state transitions with interface elements, definitions, and ideal constraints on X, Y, Z, RX, RY, RZ axes represented by lock and unlock icons connected by colored arrows.

Predictability at the interface level

We identify and quantify unwanted mechanical interactions with a bottom-up process.

Rule-based checklists ensure no negative effects are overlooked, and identified risks are aggregated at system level and linked directly to requirements and specifications.

Couplings, dependencies, and traceability

Through a top-down architecture process, we establish clear interface specifications and maintain traceability across requirements, drawings, and mitigations.

This creates a direct link between risk management and real product design.

Diagram titled 'Interface couplings' showing two tables of interface constraints and computed screening values linked to five colored interface coupling bars labeled with element pairs such as Needle Cover and Body, Rear Cap and Body, Rear Cap and Plunger Rod, Rotator and Rear Cap, and Rotator and Needle Cover.

Dimensioning for capability

By combining tolerance allocation methods or real capability data, we link part specifications to rationales and control strategies.

This enables data-driven failure rates forecasts and makes risk control both verifiable and efficient.

Ready to get more out of your risk management process?

RD8 helps device teams turn risk assessment from a qualitative documentation exercise into a quantitative design control process - faster, clearer, and more predictable.

Let’s explore if this approach is relevant to your project.