Case Study: ISO 13485 Medical Diagnostic Housing

Project Summary: Diagnostic Imaging Device Housing for Medical OEM

A global medical device OEM producing point-of-care diagnostic imaging equipment engaged DitaiPlastic to manufacture the structural housings and covers for a new benchtop ultrasound and fluorescence imaging platform. The program required cleanroom-adjacent manufacturing, ISO 13485 quality system alignment, flame-retardant materials, and an antimicrobial surface treatment compatible with hospital cleaning protocols.

We are now in the third year of serial production with full device history record (DHR) traceability on every shipped part.

The Challenge

Medical device housings carry regulatory weight that industrial enclosures do not. The housing is part of the device’s regulatory submission (510(k) and CE MDR), which means every material change, process change, or supplier change can trigger a change notification to the notified body. The client needed a supplier who could hold process and material specification indefinitely.

Specific requirements:

• ISO 13485 aligned quality system with full material and process traceability.
• USP Class VI / ISO 10993-5 compatible materials for any surface a clinician might touch.
• Flame retardant to UL 94 V-0 for IEC 60601-1 compliance.
• Antimicrobial surface compatible with CaviCide, bleach wipes, and 70% IPA for a minimum of 2,000 cleaning cycles without cracking, hazing, or coating failure.
• Cleanroom-adjacent assembly — parts must ship bagged and particle-controlled to the client’s Class 100,000 assembly line.

Our Solution

We deployed our medical program cell — a segregated production area with controlled access, dedicated tooling storage, and a Class 100,000 bag-and-ship finishing room.

Material selection

We specified a medical-grade FR-ABS meeting UL 94 V-0 and ISO 10993-5 cytotoxicity. The sheet is sourced from a single qualified extruder on locked lot-control, with certificate of analysis (CoA) on every lot.

Antimicrobial coating

Post-forming, parts receive a silver-ion-infused polyurethane topcoat applied in a controlled spray booth. The coating is validated against EPA-registered hospital disinfectants for 2,500+ wipe cycles with no measurable change in gloss, color, or surface integrity.

Process controls

Every production lot includes a first-article inspection (FAI) against the master AQL plan, a material CoA, a coating batch record, and a serialized traveler. Full device history record data is retained for 15 years per 21 CFR 820.

Technical Details

• Materials: FR-ABS 3.5 mm, medical grade, pigmented off-white (Pantone Cool Gray 1C).
• Coating: silver-ion polyurethane topcoat, 40 microns nominal dry film.
• Overall dimensions: upper cover 520 x 380 x 180 mm; lower housing 520 x 380 x 140 mm.
• Wall thickness post-form: 2.4–3.0 mm.
• Dimensional tolerance: ±0.4 mm on display bezel interface; ±0.6 mm on all other features.
• Flammability: UL 94 V-0.
• Biocompatibility: ISO 10993-5 cytotoxicity passed.
• EMC/safety support: material selection compatible with IEC 60601-1 and 60601-1-2.
• Annual volume: 4,500 device sets (9,000 parts).

Results

• Zero field failures attributable to the housing over 3 years and ~13,000 devices in clinical use.
• 100% DHR traceability on every shipped part — every unit links back to material lot, coating batch, operator, and inspection record.
• Cleaning durability validated to 2,500 wipe cycles with CaviCide, 10% bleach, and 70% IPA without failure.
• Tooling cost 80% lower than the injection-molded design the client originally spec’d, freeing budget for clinical trials.
• Change notifications: zero — three years of serial production with no material or process changes requiring regulatory filing.

Client Testimonial

“Medical is about boring reliability — doing the same thing, the same way, for years. DitaiPlastic gave us that. Their documentation discipline and lot control made our design history file straightforward, and we’ve never had a housing-related complaint from the field.”

— Director of Quality, Tier-1 Medical Diagnostic OEM

Related Capabilities Deployed

• Heavy gauge vacuum forming in medical-grade FR-ABS
• Antimicrobial coating application in controlled spray booth
• Class 100,000 finishing and bag-and-ship
• ISO 13485 aligned QMS with DHR and lot traceability
• IEC 60601-1 material compliance documentation

Lessons Learned / Key Takeaways

1. Medical device housings are a documentation business as much as a manufacturing business. Winning and keeping the program means flawless CoAs, DHRs, and change control — not just good parts.

2. Lock the supply chain early. Single-source the sheet extruder, single-source the coating chemistry, and freeze the process. Every change costs the customer a regulatory filing.

3. Antimicrobial + vacuum forming is a real alternative to injection-molded medical enclosures for benchtop devices in the 1K–10K/year volume range.

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Developing a Medical Device Housing?

We partner with medical OEMs from early DFM through serial production, with full ISO 13485 alignment and IEC 60601-1 material support. contact us to schedule a confidential capability review.