After navigating FDA clearance or EU MDR compliance, locking down the Bill of Materials (BOM), and surviving rigorous clinical trials, your medical device is finally ready for the real world. Yet, as the launch window approaches, one critical component is often missing from the Gantt chart: a validated carrying solution.
Many companies treat the case as an afterthought, only to realize that “custom” doesn’t happen overnight. A custom carrying case is more than just a protective layer to store your equipment; it serves as your primary brand ambassador. The case is the very first thing the customer sees, even before they lay eyes on the device itself, therefore the case establishes the perception of your product’s quality even before the first use.
If you are wondering what the road ahead looks like, here is a clear, simple guide to the custom case design process, from the first handshake to the final delivery.
What you will learn
- The four critical stages of custom carrying case development
- Realistic timelines for each phase (so you can plan your launch)
- The inputs you will need to provide to get started
- How to bridge the gap between a design concept and mass production
Typically, a custom case design process spans four phases: Exploration, Concept, Design & Engineering, and Production. Depending on the project’s complexity, the full cycle from kickoff to delivery usually takes 5 to 10 months.
Step 1: Exploration – Defining the DNA of Your Case
Every great project starts with a conversation, the Exploration phase.
This phase kicks off with a meeting to align specific requirements. This isn’t just about dimensions; it’s about understanding how the users work with the case. Do they throw the case in an ambulance? Do they need to open it with one hand? This stage is critical. The design team goal is to guide you through the most important requirements, ensuring the custom solution also meets the questions you didn’t think to ask.
To make speedy progress, your design partner typically needs three things:
- Artwork files: Logos and brand guidelines.
- 3D files: CAD models of the device.
- A physical sample: Nothing beats holding the actual device to test fit and ergonomics.
Occasionally, when time is critical, the design process can begin even if one of these items is missing. While not ideal, there are effective workarounds. For example, if a physical sample is unavailable, a 3D-printed mockup may be sufficient for the first presentation.
Timeline: Once these inputs are received, it typically takes about 2-3 weeks to complete a comprehensive Product Requirement Document (PRD).
Note: This phase is the right time to identify potential issues early. If a device has a sensitive sensor or a screw that should be relocated to improve the fit, an experienced design team will identify it before drawing a single line. This is why it is crucial to start this process as early as possible, often before the device reaches its final iteration. Minor changes to the device can have a huge impact on the case’s design, ensuring it performs efficiently and effectively.
Step 2: Concept – Visualizing the Solution
Now that the challenge is well defined, the project will move to the Concept phase.
This stage translates requirements into visual strategies. You will receive a formal Preliminary Design Review (PDR). In this presentation, a professional design team typically presents up to three distinct concepts.
The goal is to explore the extremes of your requirements to help you decide on the best path forward. For example, the 3 options may be as follows:
- Concept A: May prioritize a slim profile and lightweight materials for easy portability.
- Concept B: May focus on maximum impact protection with rugged bumpers, prioritizing a degree of compactness over durability.
- Concept C: May be a balance of the first two concepts, perhaps introducing a unique opening mechanism or a novel material combination.
The presentation may include 3D renders, internal layout options, and an explanation of how a user interacts with the case (opening, closing, carrying).
Selection & Refinement: Rarely does a client pick one concept as is. Usually, the feedback is a mix: “We like the outer shell of Concept A, with the internal organization of Concept C.” Once a direction has been selected, the team consolidates these features into a single, polished design. This leads to the Critical Design Review (CDR).
Timeline: Typically, this refinement process takes about 2-3 weeks after the preferred direction is selected.
Step 3: Design & Engineering – Turning Ideas into Reality
This is where the magic (and the math) happens. The Design & Engineering phase is aimed at making the concept manufacturable and involves three concurrent tracks:
- Detailed Engineering: Creating technical blueprints.
- Tooling Production: Building the Tooling required for manufacturing.
- Process Creation: Defining exactly how the case will be assembled.
The output of this phase is a physical prototype sent directly to you for review. This is your chance to touch, feel, and test the case with your device.
Timeline: This is the longest pre-production phase as it involves creating physical tooling and prototypes, which typically require 6–12 weeks.
Step 4: Production – Crossing the Finish Line
Once the “Golden Sample” (the final reference prototype) is approved, the project transitions to Mass Production.
Many assume this is just a matter of hitting “print,” but in custom manufacturing, a synchronized supply chain is required. Before a single unit is assembled, three critical steps must occur:
Finalizing Documentation: The legal and technical backbone of the product. Engineers “lock in” the Production File and define the Quality Plan. This plan dictates exactly how quality is measured—from the stitch density of a seam to the crush resistance of an EVA shell.
Material Sourcing: Manufacturing cannot begin until every component is in the factory warehouse. This involves procuring everything from custom-dyed fabrics or specific foam densities to branded zipper pulls. In fact, there are long lead time items that must be procured weeks in advance.
Line Setup & Training: The assembly line is configured specifically for the custom case. Custom jigs are installed, and operators are trained on the specific assembly steps to ensure consistency.
Output: The delivery of the final product, fully packaged and ready for distribution.
Timeline: The production cycle from material procurement to the final product leaving the production floor, spans 8–16 weeks, depending on the complexity of the case.
Timeline Overview
To help you plan, here is the typical schedule at a glance. Please note that this timeline reflects active development time only; it does not account for internal review cycles. For instance, if your team needs 3 weeks to review the PDR, the final delivery date will shift by 3 weeks.
Phase | Duration | Key Milestone |
1. Exploration | 2–3 Weeks | Product Requirement Document (PRD) |
2. Concept | 2-3 Weeks | PDR / CDR |
3. Design & Engineering | 6–12 Weeks | Prototype Delivery |
4. Production | 8–16 Weeks | Mass Production Delivery |
Note: If your industry requires extensive Validation and Verification processes (common in medical devices), an additional few weeks may be required.
Key Takeaways
- Input Matters: Providing 3D files and physical samples early on, prevents delays in the exploration phase.
- Iterative Design: You will have a few major review points (PDR, DR and CDR) to refine the design before any metal is cut for tooling.
- Prototyping is Critical: You will always receive a physical prototype to approve before mass production begins.
- Plan for Lead Times: Quality manufacturing takes time. Factor in the time needed for case production when planning your device launch.
Shell-Case Expertise in Action
“True design expertise isn’t just about making the device fit; it’s about ensuring it survives and functions in the real world. We anticipate the drop angles, the user interactions, and the environmental stresses so you don’t have to.”
– Udi Oren, R&D Manager, Shell-Case.
The reality is simple: You are experts in life-saving medical technology. You shouldn’t have to be experts in polymer science, impact dynamics, or ergonomic design.
“Hand us your technical challenges, and we will engineer the solution.”
At Shell-Case, we act as your engineering partner, optimizing the delicate balance between maximum protection and user-friendly design. We manage the complex trade-offs; weight vs. durability, accessibility vs. security while strictly adhering to the timeline required for your device launch.
FAQ
How long does the entire process take?
A complete custom project typically runs between 5 to 10 months (approx. 18–32 weeks) from the kickoff meeting to delivery, depending on complexity and material availability.
Do I really need to send a physical device?
Yes. While 3D files are essential for design, a physical sample allows engineers to test the “fit and feel,” ensuring the case is ergonomic and easy to use.
What if I need validation for a medical device?
Validation and Verification (V&V) is an optional and often necessary step for regulated industries. We can perform this, but you should budget an additional 4–16 weeks for these rigorous tests.
