Manufacturing effects on materials have become a significant area of focus for medical device manufacturersÂ in recent times. âMaterials are the major or possible cause of 30 to 40% of FDA recalls for medical devices," according to Jeffrey Ellis.Â 1Â And according to a McKinsey report, product âquality eventsâ (including recalls, warning letters, consent decrees, warranties, and lawsuits) cost the medical device industry between $2.5 and $5 billion annually.â 2Pushing the Limits & Developing New Materials
As technologists continue to progress our reality into that of a sci-fi movie, they are pushing the limits of materials causing molecular-level variation to affect the quality of products. Additionally, scientists are breaking ground formulating new materials through the insertion of dissimilar substances. Some examples of cutting-edge materials are the following:
- Bioabsorbable metals that allow for future MRIs after elimination3
- Wound assisting materials that form part of the new growth tissue4
- âArtificial ovaries made from a biological hydrogelâ5
- âPatient-specific vascular stents made from a citric acid-based polymerâ5
- Injectable gels that carry biochemical signals3
When pushing materials to their limits, their properties become more susceptible to minor manufacturing changes or variation that would otherwise be trivial. Additionally, new formulations of materials are susceptible to manufacturing-based failures due to lacking historical knowledge of variation. Some well-established effects on product performance are processing time, temperature, and pressure along with material storage conditions such as humidity, UV radiation, and temperature. However, other lesser known manufacturing factors are impacting more recent products in the field such as:
- Moisture in material, weak welding, or in-mold stress resulting in weakened products with shortened lives6
- Improperly prepared resins leading to unexpected failures2
- Contamination with particulates or other materials during formulation changing material performance2
- PVC Plasticizer leaching into a hydrogel causing crystals blocking an electrical signal1
Being a part of the 30% - 40% of companies with materials-related recalls can be a detriment to your business. Consider incorporating materials science into your development capabilities and reach out to experts to understand what manufacturing variation could cause material property changes. Assess materials in your risk analysis and especially test for potential variation factors having a direct or confounding effect on your productâs performance.Editor's Note: Stacie Depner will be moderating "Tech Talk Panel:Â Criteria for Choosing the Right Material for Your Device," during theÂ MD&M West 2020 conference onÂ Wednesday, February 12, atÂ 8:30 AM - 9:30 AM in RoomÂ 210C. She will be joined by panelistsÂ Ekaterina Tkatchouk, principal engineer, research & development, Surgical Structural Heart at Edwards Lifesciences;Â Gilles Robert,Â CEO at Ceramaret;Â Tim Conrad, principal implant design and materials engineer - research and technology at Advanced Bionics; andÂ Jay Jayashankar, materials & process development engineer at Cardiovascular SystemsÂ Inc.ReferencesSparrow, Norbert,Â "Material failure is root cause of many medical device recalls," Â Plastics Today, March 2017.Heintz, Amy,Â "Mitigating Risks of Materials Failures in Medical Devices,"Â MD+DI, June 2015
"Materials Science in Medical Device Manufacturing,"Â Proven Process Medical Devices Web site.
Mir, M., Ali, M.N., Barakullah, A.Â et al. "Synthetic polymeric biomaterials for wound healing: a review," Progressive BiomaterialsÂ 7,Â 1â21 (2018). https://doi.org/10.1007/s40204-018-0083-4
Barbella, Michael, "Practical Matters: A Look at Medical Device Materials," Medical Product Outsourcing, March 2018.
"Causes of Plastic Failure," Thomas Net.