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This Defense Intelligence Reference Document, dated 7 January 2010, was prepared by the Defense Intelligence Agency's Defense Warning Office. It is one of a series of advanced technology reports produced in FY 2009 under the Advanced Aerospace Weapon System Applications program. The report reviews biomaterials used in medicine, including silicones, Teflon, biodegradable polymers, hydrogels, titanium, ceramics and tissue constructs, and applications such as stents, joints, contact lenses, drug delivery and dialysis. It concludes that most innovation lies in new ways to apply existing materials.
From the source: Release of 2026-09-18 Incident: 1/7/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD is a broad survey of biomaterials, including metals, polymers, ceramics, glasses, and composites designed to interact with living tissue, and argues that their value depends mainly on biocompatibility, reliability, and careful matching of material properties to specific medical uses. The report reviews major application areas including biosensors, implants, cardiovascular devices, contact lenses, drug delivery systems, tissue constructs, titanium devices, and dialysis membranes, emphasizing that no single biomaterial works best in every setting. Its overall conclusion is that biomaterials are already foundational to a large medical-device industry and save or improve millions of lives, but that progress tends to be slow because safety testing is stringent; as a result, most advances come from improved ways of applying established materials such as silicone, Teflon, biodegradable polymers, ceramics, and titanium in new devices and clinical settings rather than from radically new substances.
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Preformed ePTFE subcutaneous
implant materials have been used to
improve facial reconstruction and
cosmetic surgery outcomes. Figure 9
is a manufacturer's product
information showing the utility of
using ePTFE in cosmetic surgery.
PTFE has relatively low wear
resistance, but under compression or
in situations where rubbing or
abrasion can occur, it can produce
wear particles. These can result in a
chronic inflammatory reaction, an
undesirable outcome. For a given
application, the biomateria ls engineer
must consider many aspects of the
physical and biological properties of
the materials . Thus, although PTFE is
highly inert in the body, applying it in
the wrong circumstances (for
example, to a device that is under
BEFORE AFrER
BEFORE AFrER
Figure 9. Expanded PTFE (Gore-Tex or ePTFE) Used in
Lip Implants. This is a synthetic implant that has been
used in the face and body for many years. The main
advantage is that it is not absorbed over time and the
results are permanent .
compression or exposed to wear) may lead to a reaction that no longer qualifies as
"biocompatible."
BIODEGRADABLE POLYMERS
Biodegradable polymers are an
important and relatively large
category of biomaterials that are used
extensively in the medical and food
industries. In the latter, they are used
as food wrappings and other
packaging derived from natural food
substances that slowly degrade-by
evaporation into water vapor and
carbon dioxide- when exposed to the
sun and outdoor environments, thus
minimizing waste disposal. Figure 10
shows a complex shape made from
polylactide (PLA), a biodegradable
polymer.
Biodegradable polymers can be either
natural or synthetic. In general,
synthetic polymers offer greater
advantages than do natural materials in that they can be tailored to give a wider range
of properties and more predictable lot-to-lot uniformity than can materials from natural
sources . Synthetic polymers also represent a more reliable source of raw materials-
UNCLASSIFIED/ {FOR OEE!CJA1 11 SE QNI X
Figure 10. Biodegradable Polymers. Polymers such as
PLA are much like conventional plastics and, as such , have
qualities of clarity, flexibility, and strength.
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