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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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BRAIN-MACHINE INTERFACES
A specific development in MEMS based neuroengineering has been the brain-machine
interface (BMI). These devices use computers to interpret brain signals from implanted
neural arrays and then use the information to control machines and setup an
automated environment.
The development of such devices can have a profound impact on the quality of life for
those individuals practically isolated because of their disabilities. Connected machines
will enable them to enjoy the everyday things we take for granted .
For example, a visual prosthesis could potentially restore partial vision to a blind patient
by stimulating neurons in the visual cortex using an input BMI. Signals could be
recorded from the motor cortex using an output BMI in order to bypass a neural injury
and restore some movement to a paralyzed patient. Even a simpler device that would
allow a patient to move a cu rsor on a screen would make a significant impact.
It is generally recognized that clinical applications of such BMis may require t he
activities of hundreds or thousands of neurons to be simultaneously sampled. Figure 21
is an SEM photograph of a dense array of electrodes directed towards BMI applications.
Figure 21. Scanning Electron Micrograph of a 1141 Electrode Array Made to Be Inserted Into the
Surface of the Human Brain (University of Utah)
A significant problem with these devices is that when they get too densely disposed,
blood flow and disruption of the natural wiring of the brain causes decline of tissue
function.
Another very important issue is the biocompatibility of the material that the implants
are coated with. The more biocompatible these materials are the less tissue reaction
they will cause thus resulting less implant risk and longer implant period.
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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.