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This Defense Intelligence Reference Document, dated 31 March 2010 and numbered DIA-08-1003-020, was prepared by the Defense Intelligence Agency's Defense Warning Office under its Advanced Aerospace Weapon System Applications Program. It surveys biosensors and biomedical microelectromechanical systems, covering brain-implanted micromachine neuroelectrodes, drug-delivery pumps, glucose sensors, neural interfaces, retinal prostheses, microfluidic lab chips, NASA cell-culture systems and microcantilever sensors. It concludes that the field is expanding rapidly, with nanomechanical systems expected to follow.
From the source:Release of 2026-09-18 Incident: 3/31/10, 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 surveys biosensors and BioMEMS, a broad class of miniature biomedical devices that combine microscale engineering with sensing, fluid handling, stimulation, or drug-delivery functions. The report reviews major application areas including implantable blood-chemistry sensors, neural interfaces, neurostimulation, drug-delivery pumps, microfluidic systems, and emerging nanoscale extensions of the field, while emphasizing that miniaturization can improve sensitivity and enable functions that are difficult or impossible at larger scales. However, it also makes clear that practical development is constrained by biocompatibility, long-term stability, sensor drift, device degradation inside the body, and the high regulatory burden associated with implantable medical systems. The document presents BioMEMS as a rapidly growing and productive field whose future advances are likely to come through continued improvements in fabrication, materials, and reliability.
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Thin Mylar
Substrate
Figure 15. Thermopile Glucose Sensor (left) With Functional Illustration (right) are Made Using
Photolithographic Techniques. Th is larger device is about 8 mm in lengt h but has approxi mat el y 50 m icron
minim um geometries. (Towe et al. )
At ASU the glucose sensor has been constructed on a thin mylar plastic substrate and
so can be curved into a cyl inder to form a small tube. This tube is then sensitive to
glucose concentrations on its outside exposure to the blood stream. Figure 16 shows a
photograph and an illustration of a glucose sensor implemented in the form of a
catheter. The electrical output signal is routed by wires down the length of the catheter
for a remote readout. The device was implanted in a pig over a short duration and the
decrease in blood glucose concentrations in response to admin istration of insulin were
recorded and are shown in the right hand panel of Figure 16.
10 min
Figure 16. Photograph and Illustration of the Thermopile Glucose Sensor in a Catheter. Its confi gurat ion
is shown ( left) and its response in detecting ch anges in blood glucose in a pig as a result of insul in adm inistration
to t he animal. (ASU resea rch.) Towe et al.
Th is glucose sensor approach has been found to have limitations in stability when
introduced into tissue or blood. Primarily the problems, as with many sensors, arise
from the system chemistry and not as much from the electronic portion of the sensor .
The glucose oxidase enzyme slow ly decays over time and thus the sensor sensitivity
and calibration drifts making it eventually unusable.
These problems have no easy solution. Investigators have been working with various
forms of blood chemistry sensors for forty years or more. Microfabricated
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 45 pages are in the text index: search them above, or from the library's search.