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International Journal of Health Geographics 2007, 6:9


Figure 1 system diagram CAALYX system diagram. Diagram showing the main components of CAALYX (WLD = Wearable Light Device).

Why CAALYX? Other tele-monitoring projects either send location infor- mation without much or any details about the current medical status of the user, e.g., the Columba Bracelet, a GPS-enabled bracelet permitting the localisation of Alzhe- imer patients if they get lost or become disoriented [11], and location-tailored health information services('push services') [12], or send detailed information about user's medical status without any knowledge about their loca- tion, e.g., M2DM – Multi Access Services for Telematic Management of Diabetes Mellitus [13], and MobiHealth [14]. However, to be able to offer to users proper help dur- ing emergencies wherever they might be (including inci- dents in which patients are unconscious or unable to adequately describe their location for any reason), a serv- ice would ideally require both detailed information about

user's current medical status and details of the user's cur- rent location in order to dispatch a suitably equipped emergency team to the patient, and that is exactly what we are developing in CAALYX. This is helped by the fact that CAALYX does not rely on fixed fall sensors installed in one place (at home), like infrared fall detection sensors or cameras (computer vision) that are physically tied to, and configured for, an older person's residence and need to first learn about his/her daily routine movement, but uses novel wearable fall sensors (featuring integrated acceler- ometers and gyroscopes, developed at the University of Limerick, Ireland and at the National University of Ire- land, Galway, Ireland, an affiliate of the University of Lim- erick for the purposes of this project). These wearable sensors accompany the older person anywhere they go, together with an outdoors' GPS solution. The latter will

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