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Carolinas HealthCare System Deploying RTLS at Its 20 Hospitals

The organization will attach Wi-Fi based active RFID tags to 5,000 medical devices, to help ensure equipment is properly serviced and available where and when it is needed.
By Beth Bacheldor
Oct 24, 2007Carolinas HealthCare System (CHS) is implementing an RFID-enabled real-time location system (RTLS) to track thousands of medical devices, such as infusion pumps and ventilators. The health-care network, consisting of 20 hospitals in North and South Carolina, is using the RTLS to help track the devices so they can be serviced at the right time, and to ensure they are available where and when they're needed.

The RTLS system leverages CHS' existing network of Cisco 802.11 Wi-Fi access points, which the organization has deployed throughout the hospitals for a variety of applications. These applications include the hospitals' computers on wheels, used to access patient information at the bedside or the point of care. The system also leverages Ekahau active 2.4 GHz RFID tags, which comply with the 802.11 protocol. The tags are powered by commercial, off-the-shelf, CR2 lithium batteries with an approximate shelf life of five years.

Each tag emits its unique ID number whenever it comes to rest following movement. Nearby Wi-Fi access points receive tag transmissions and forward them, via a wide-area-network, back to a central server located at the Carolinas Medical Center in Charlotte, N.C. The server runs Java-based Ekahau Positioning Engine (EPE) software, which analyzes a number of factors, including tag signal strength, to determine an object's location. According to Ekahau—which is based in Saratoga, Calif., with offices in Virginia, Finland and Hong Kong—the engine can track the real-time location of more than 10,000 objects on one server, and calculate up to 600 locations per second to within an average of 1 meter (3½ feet).

Each tag's unique ID number has been associated with information related to that specific device, such as its maintenance schedule and location, and housed on the central server. CHS employees with appropriate credentials can use a Web browser to access a real-time view of a tracked area, as well as the location of tagged devices in that area, or search for particular devices and their related information. For example, a technician can query the system using serial number or other descriptor to locate a device due for maintenance.

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