Deep Drawn Metal Forming for Medical Device Components

Medical device components are built to the highest standard, because every housing, cannula, sensor enclosure, and implant body in a device has a direct role in patient outcomes. That level of responsibility calls for parts that perform precisely, qualify cleanly, and hold up across the full life of a device program.

That means sourcing a forming process and a manufacturing partner capable of meeting tight tolerances, material requirements, and traceability with the structural integrity that seamless construction provides.

Deep drawn metal forming has become a go-to solution for exactly these applications. Here’s what’s driving the popularity in deep drawn metal forming for medical components, and what to understand before sourcing begins.

Why Deep Drawn Metal Forming Works for the Medical Industry

Deep drawn metal forming is a cold-working process that pulls a flat metal blank into a die using a punch, forming a seamless, three-dimensional shape from a single continuous piece of metal. Unlike fabrication methods that weld, join, or machine parts from stock, the deep draw process creates a part whose walls, base, and geometry emerge from one unbroken material structure.

That matters in medical applications for a specific reason: Seams and joints are sites of potential failure. They collect contaminants, create stress concentrations and complicate sterilization and leak testing. A seamless deep drawn housing eliminates all of that at the material level.

Common medical device applications include surgical instrument housings and handles, implantable device enclosures, fluid delivery and catheter components, diagnostic sensor housings, and battery or power module casings for active implantables.

Material Selection: A Design-Phase Decision

Choosing the right material for a deep drawn medical component shapes everything from tooling design to regulatory documentation. The forming process works with a range of biocompatible metals, and not every alloy deep draws identically. 

Draw ratios, annealing requirements, and wall thickness behaviors all vary, which is why material selection should be confirmed during the manufacturability review phase, before it affects lead time.

316L Stainless Steel is the most common choice for medical applications. Its corrosion resistance, biocompatibility, and ease of cleaning make it suitable for implantable housings, surgical tools, and fluid-contact components. The low carbon content reduces sensitization during the forming process.

Titanium alloys offer superior biocompatibility and strength-to-weight ratio for implantable applications, though they require precise process control due to springback behavior during forming.

Aluminum alloys appear in non-implantable housings and cases where weight reduction is a design priority, such as diagnostic equipment enclosures, for example.

Copper and brass alloys are used in certain electrical contact and connector applications where conductivity is required alongside formed geometry.

Design for Manufacturability: Getting It Right Before Tooling

Geometry that was never evaluated for formability before tooling is the most common source of cost and schedule overruns in deep drawn component programs. Corners that are too sharp, wall-to-depth ratios that exceed material limits, and surface finish specifications that require post-process operations all add time and cost that a design-phase manufacturability review can prevent. 

Engaging a forming partner early typically reduces tooling revisions, accelerates qualification timelines, and produces a more manufacturable part at a lower per-unit cost.

A manufacturability review with an experienced deep draw forming partner early in the design process should address:

• Draw ratio: The relationship between blank diameter and part diameter, which determines how many draw stages are needed.
• Wall taper and draft angles: Affecting both the forming process and part ejection.
• Corner radii: Internal and external radii must meet minimum thresholds to avoid material thinning or tearing.
• Tolerance stackup: Particularly for components that interface with machined or molded mating parts.
• Surface finish requirements: Smooth bore requirements for fluid contact, polished exteriors for sterilization compatibility.

Accurate Forming: A Partner Built for the Long Run

Medical device programs don’t end at first article approval. Components go into devices that may remain on the market for a decade or more. A supplier who can support program longevity, with consistent tooling maintenance, stable lot-to-lot quality, and responsive lead times, is worth as much as their initial price per piece.

Accurate Forming’s customer base spans long-term relationships across medical, defense, and industrial markets, built on the process depth and program management discipline these programs require.

If you’re evaluating deep drawn metal forming for an upcoming medical device component, the right starting point is a manufacturability review. Bring your requirements, and Accurate Forming’s team will tell you exactly what the process can deliver.