Customers who entrust a manufacturer with their medical cart design and production have high expectations about quality and reliability. That’s understandable, and it’s also why manufacturers need to plan for failure in order to prevent it.
What is failure mode and effects analysis, and why does it matter so much in medical cart manufacturing? In short, failure mode and effects analysis (FMEA) is a structured, step-by-step method for identifying every plausible way a product or process could fail, ranking those failures by risk, and fixing the highest-risk issues before they ever reach a customer.
Good medical cart manufacturers rely on FMEA to catch and eliminate potential defects early in the design and production process, long before they become costly late-stage corrections or worse, field failures in a clinical setting.
What’s FMEA?
Failure mode and effects analysis, or FMEA, is a systematic method for identifying potential issues or concerns that could arise in a given design or redesign project before they occur.
Breaking down the name helps clarify the process:
- "Failure modes" refers to the specific ways something might fail, along with the actual or plausible negative effects of that failure.
- "Effects analysis" refers to the study of those failure modes and the impact they would have on the product, the process, or the end user.
FMEA gives manufacturing teams a proactive framework for asking, "What could go wrong here, how bad would it be, and how would we even know it happened?" and then acting on the answers before a single defective unit is built.
The Three Types of FMEA: DFMEA, PFMEA, and MFMEA
There isn't just one type of FMEA. Manufacturers typically apply three distinct types, each tailored to a different point of focus across the product lifecycle.
- DFMEA: Design Failure Mode and Effects Analysis
- PFMEA: Process Failure Mode and Effects Analysis
- MFMEA: Materials Failure Modes and Effects Analysis
DFMEA: Design Failure Mode and Effects Analysis
Design Failure Mode and Effects Analysis (DFMEA) typically occurs during the design stage of a project. Its purpose is to:
- Determine how the design itself may fail
- Assign a coordinating risk ranking to each potential failure
- Take the necessary corrective or preventive action
DFMEA is revisited throughout the project to make sure safety and reliability are maintained as the design evolves, through prototyping, engineering changes, and final validation.
PFMEA: Process Failure Mode and Effects Analysis
Process Failure Mode and Effects Analysis (PFMEA) takes place before the product is actually built, with a focus on the manufacturing process itself. PFMEA evaluates:
- The number and types of errors that could occur during production
- The effect each error would have on the finished product
- Ways to eliminate or reduce the likelihood of those errors
- Whether the product will reach the customer on time and without defects
While DFMEA and PFMEA look at different stages, they're both grounded in the same scoring system, which flags when a team needs to take action on a given potential failure mode.
How DFMEA and PFMEA Work Together
Together, DFMEA and PFMEA play a critical role in:
- Brainstorming every potential failure, however unlikely it may seem
- Examining the downstream effects of those failures
- Determining the severity of each failure and how easily it could be detected
- Assigning a Risk Priority Number (RPN) to each failure mode
Understanding the Risk Priority Number (RPN)
The Risk Priority Number is the mechanism that turns FMEA from a brainstorming exercise into a prioritization tool. Each failure mode is scored on three factors, usually on a scale of 1–10:
- Severity – How serious would the consequences be if this failure occurred?
- Occurrence – How likely is this failure to happen?
- Detection – How likely is the team to catch this failure before it reaches the customer?
Multiplying these three scores together produces the RPN:
RPN = Severity × Occurrence × Detection
If the RPN reaches a certain threshold, the team develops and executes a plan of action to reduce the risk by redesigning a component, adding a quality check, or changing a process step. Once the action is implemented, the team repeats the scoring process to confirm the fix actually worked and the RPN has dropped to an acceptable level.
What’s MFMEA?
Materials Failure Modes and Effects Analysis (MFMEA) is a process specific to HUI. While similar to other FMEA processes, MFMEA emphasizes materials, specifically the risk of material outages caused by suppliers or other circumstances, and material delivery lead times. Supplier quality is researched and discussed thoroughly for optimal results; in some cases, this leads to developing a contingency plan.
Partner With a Manufacturer That Takes FMEA Seriously
Understanding what failure mode and effects analysis is only matters if a manufacturer actually puts it into practice consistently, across design, production, and materials sourcing. That's the standard HUI holds itself to on every medical cart we build.
