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    5 Questions: Injection Molding for Medical Devices

    This article provides key guidelines and considerations for selecting the right molding company for a medical device part.

    5 Questions: Injection Molding for Medical Devices
    Sterilization processes can impact a molded part's appearance. Ensure a prospective molder has the right experience for the specific part.
    5 Questions: Injection Molding for Medical Devices
    Ensure a prospective molder can handle all the specific details of a part design to ensure the original vision is fulfilled.
    Eric Lowe, Director of Design and Engineering, Xcentric Mold & Engineering08.23.17
    An injection molded part typically starts out as a sketch. With the help of sophisticated CAD software, that sketch became a finished design, reflecting the original vision down to the smallest detail. It’s then reviewed, revised, tweaked, and printed until it is finally finished.
     
    Well, not quite.
     
    The part—the one sweated over for all those hours—still exists only in a computer’s imagination, on a screen, or on paper. A molder will need to be contracted to turn that design into physical parts.
     
    It might seem like a small step, but the vision is being entrusted to that molder, and in today’s competitive market the difference between “just right” and “pretty close” can determine success or failure. The design may require overmolding using different resins. Stringent regulatory requirements will need to be complied with. Depending upon the application, biocompatibility may be an issue. Further, the device may have to withstand sterilization and contact with chemicals of various kinds.
     
    There are plenty of molders out there; how does one make the right choice for a project? Following are five critical questions to ask before making that decision. Some should even be asked earlier in the design phase to ultimately save time.
     
    1. Is my part moldable?
    Injection molding is a very flexible technology, but it does have its limitations. Some designs simply cannot be molded and will require either a redesign or the use of a different production process. Other designs can be molded, but only by a sophisticated molding shop. Before redesigning an “unmoldable” part, be sure the decision is being made for the part’s benefit and not for the benefit of the molder.
     
    Ideally, a molder should be more concerned with the needs of a customer rather than focusing on their own convenience. See if the quote received includes a free manufacturability analysis. If one molder can’t produce the designed part, see if another will. There are some features that simply can’t be molded, but many more that are too challenging for some molders. If a part truly can’t be molded, an expert molding firm will work with a customer to ensure the necessary changes are made while maintaining the original design concept.
     
    2. Can the molder handle the “tricky stuff”?
    One of the benefits of injection molding is the ability to mix materials with inserts and overmolding, while working around process limitations with capabilities, such as side actions. All of those capabilities require special skills, equipment, and processes that not all molders have. In some cases, molders will simply no-bid a submission; in others, they will accept the job but be performing at the very limits of their capabilities.
     
    With a complex part design, ensure a molder can demonstrate experience in that specific area, whether tight tolerances, internal or external threads, undercuts, inserts, or overmolding. An experienced molder will work with a customer to turn a vision into the best possible part, ideally without adding too much delay to the process.
     
    3. Can the molder meet the customer’s deadlines?
    Today’s medtech market moves faster than ever before, and competition is worldwide. The industry isn’t kind to runners up, and today’s innovative idea can easily become tomorrow’s commodity. Getting to market first can have a huge impact on ROI. No one should cut corners, but when a molder says a quote could take weeks and that parts will take six to 18 weeks, many projects can’t afford that amount of delay. Seek a molder willing to meet already established deadlines.
     
    With today’s modern tools, a quote should be ready within hours and finished parts in a week or two, regardless of the part design complexity. Medical device manufacturers need to get a new product to customers and maximize margins as a first mover in the market. And remember: slower isn’t better, it’s just slower.
     
    4. Who is making the mold and molding the parts?
    Getting it right the first time without delay doesn’t just happen; it takes expertise and experience. In the molding industry, there are numerous methods for cutting corners—shipping work overseas or parceling out work through brokers. That approach transforms a design into a commodity with the accompanying assumption that “parts are parts.” The problem is that just a few substandard part failures can ruin a company’s reputation. Further, a minor delay in getting to market can put a new device introduction onto life support. If a customer has questions, should they be required to address them with someone 12 time zones away or through a third party? Can a medical device manufacturer afford to put a project on hold while parts are in transit from an unknown location?
     
    Consider the benefits of a domestic molder. Look for a molding partner that will be available to handle calls at a reasonable time, or even schedule a visit with. Know who is working on the molded parts and where to reach them. Consider the benefit of knowing where the part molds are through the entire life of the product.
     
    5. What is the right price?
    There’s no right price for the wrong product. Saving money is always appealing, but not if it increases risk. Ensure the specified product is provided in the timeframe required. Know how questions will be handled and who is seeing the job through to completion. Once those assurances are in place, the best price for the right product can be sought. Also, ensure the price quoted is the real price. Watch for hidden fees such as those tied to shipping, expediting, or remaking molds.
     
    The right molder may not be the cheapest option, but rather one who will quote the best possible price for ensuring the parts are fabricated correctly and within the right timeframe. Beware lowball quotes and hidden fees. Further, consider cutting out the middle man—a broker who farms a parts orders out and removes the medical device manufacturer from the selection process, possibly inflating costs. Also, if a large number of parts are required, keep in mind that molds do wear out over time. Ensure there won’t be charges for repair or rebuild.
     
    The Bottom Line
    Choose a molder who can produce parts the way they were designed. Expect timely quotes and rapid turnaround of parts orders. Deal with experienced molders who can demonstrate that they understand the specific needs of a medical device part while also making themselves available throughout the process. Then seek the best price, while remaining confident it will be for the right parts, on schedule, from a trusted supply partner.
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