Medical Design Briefs - October 2022 - 10
Standard Test Method for Evaluation of
Chemical Resistance of Thermoplastics
for Non-Disposable Medical Devices
- A Voice from Industry Collaboration
Through the COVID-19 Pandemic
T
10
o reduce hospital-associated infections caused
by microorganisms, medical devices are typically
cleaned and disinfected with chemical disinfectant
solutions, including disinfecting wipes. Disinfectant
use increased markedly during the COVID-19
pandemic. These disinfectant formulations tend to be comprised
of an active ingredient, a solvent or aqueous carrier
solution, and additional constituents that enhance the formulation's
properties.
Common active ingredients include quaternary ammonium
compounds, sodium hypochlorite, and hydrogen peroxide.
In some cases, disinfectant formulations are predominantly
alcohol based with no other active ingredient and minimal
additives. The carrier solutions are often aqueous in nature
and frequently contain isopropyl alcohol or ethanol. The additional
constituents are a myriad of chemical species that improve
a disinfectant formulation's performance and delivery.
These additives can improve active ingredient efficaciousness,
increase active ingredient stability, and alter wetting behavior
of disinfectant solutions. However, some of these additives
can have damaging effects to medical device external surfaces
and enclosures, reducing the material's mechanical properties.
This is especially true for thermoplastic materials. Disinfectant
manufacturers investigate the effects of chemical disinfectants
on enclosures through material testing to reduce
negative impacts. Disinfectant manufacturers are ultimately
constrained to formulation choices that kill as many microorganisms
as quickly as possible. The formulations need to be
efficacious.
Plastic Enclosures
Raw material manufacturers (polymer/plastic companies)
have the difficult task of producing plastics and plastic alloys
that meet a host of property expectations for medical device
enclosures. Plastic enclosures are expected to meet certain
mechanical, electrical, and thermal properties while maintaining
a percentage of these properties throughout the enclosure's
life cycle. Additionally, polymer formulations need to
be workable resin systems, capable of ease of use at the point
of manufacture.
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Medical Design Briefs, October 2022
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Medical Design Briefs - October 2022
Table of Contents for the Digital Edition of Medical Design Briefs - October 2022
Medical Design Briefs - October 2022 - CV1A
Medical Design Briefs - October 2022 - CV1B
Medical Design Briefs - October 2022 - Cov1
Medical Design Briefs - October 2022 - Cov2
Medical Design Briefs - October 2022 - 1
Medical Design Briefs - October 2022 - 2
Medical Design Briefs - October 2022 - 3
Medical Design Briefs - October 2022 - 4
Medical Design Briefs - October 2022 - 5
Medical Design Briefs - October 2022 - 6
Medical Design Briefs - October 2022 - 7
Medical Design Briefs - October 2022 - 8
Medical Design Briefs - October 2022 - 9
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Medical Design Briefs - October 2022 - Cov3
Medical Design Briefs - October 2022 - Cov4
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