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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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Bioelectrical events are generated in tissues when there is an electrochemical change in
the membranes of specialized cells of the brain and nervous systems.
Neuroelectrical devices interface to the brain and nervous systems through electrodes
that touch excitable cell membrane and convert ionic current flows to electron flow in a
wire. Conversely current flows in a wire are converted by electrodes to ionic flows in
tissue.
The function of the entire human body is under control of the brain and the nervous
system. So the use of electrodes of various types as a method of monitoring and
controlling the function of the nervous system through bioelectrical currents and
electrodes is potentially a very powerful method of treating in therapeutic ways. Figure
18 suggests the idea of an excitable cell of the brain having many tendrils or dendrites
that extend outward to interconnect with other cells. Essentially these cells are the
relay points of the bioelectrical wiring of the human body.
Figure 18. A Neural Cell Showing Dendritic Inter-Connections That are Electrically Active With Other
Cells (artist's illustration)
An electrical interface to body tissues typically occurs through the use of microelectrode
systems. These electrodes are often on the order of tens of microns to millimeter-order
in sizes depending on t heir function. For example electrodes that simply measure
bioelectrical activity of the nervous system can resemble needles insulated along their
length having micron order tips both because they carry only small electrical currents
and also because they need to be placed in very specific places and they contact just a
single or few cells that control specific functions.
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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.