Medical Design Briefs - January 2025 - 12

Adhesive Bonding of Plastics in Medical Devices, Part 2
As polyolefins lack polar functional
groups that would contribute
to
hydrogen- bonding or acid-base interactions,
a corona or plasma treatment is
required to yield a strong bond to polyolefinic
materials. Corona, plasma,
flame, and ozone treatments generally
all seek to increase the surface energy of
the plastic by promoting the formation
of oxygen-containing functional groups
or otherwise polar moieties that will increase
the work of adhesion and result in
a stronger adhesive bond.
Conclusion
In the coming decades, an increased demand
for medical devices will provide
unique opportunities for growth and innovation.
Across the product hierarchy, adhesives
suitable for joining the dissimilar materials
used in medical device construction
will continue to play a role in enabling the
growth and development of this critical industry.
Understanding the unique requirements
of medical devices - from biocompatibility
and cytotoxicity to the engi neering
challenges posed by various sterilization
techniques - will grow in significance.
Cultivating an understanding of the material
properties of plastics as well as the theories
that seek to explain the complex phenomenon
of adhesion further provide
benefits when considering the design, manufacture,
and troubleshooting of medical
devices constructed with the aid of adhesives.
The adhesive bonding of polymeric
materials and plastics is of central importance
to the design and manufacture of
medical devices.
Your medical cannula can be
micro-molded at scale...
for less cost.
Finding an adhesive that is suitable for
use in a medical device may be challenging,
but the inherent flexibility and latitude
of adhesive formulations coupled
with their convenient and integration into
both low-speed and high-speed manufacturing
processes will continue to provide
solutions for even the most complex engineering
challenges. Master Bond, for example,
offers a wide array of epoxy and
silicone adhesives specially formulated for
use in medical devices. Their diverse product
range encompasses one-part, two-part,
and UV dual-cure technologies that can
meet the needs of a variety of high and
low-throughput manufacturing processes.
Additionally, consultation with Master
Bond's technical experts and engineers
may streamline the process of adhesive selection,
or, if necessary, aid in the development
of a custom-tailored adhesive product
that meets the rigorous performance
requirements of the application while also
being optimized for the manufacturing
process in question.
References
1. Bak, M-G, Won, J-S., Koo, S-W., et al., " Migration
behavior of lubricants in polypropylene composites
under accelerated thermal aging, " Polymers.
2021: 13, 1723.
2. Leeden, M., " Surface properties of plastic materials
in relation to their adhering performance, " Advanced
Engineering Materials, 2002: 4(5) 280-289.
Micro Solutions For Big Innovations®
accu-mold.com
This article was written by Venkat
Nandivada, Manager of Technical Support,
and Rohit Ramnath, Senior Product
Engineer, at Master Bond, Hackensack,
NJ. For more information, visit
www.masterbond.com.
12
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Medical Design Briefs, January 2025
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Medical Design Briefs - January 2025

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