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Modern medical devices have the facility to output data such as device settings and readings. Such devices include vital signs monitors, ventilators and infusion pumps to name a few. Wirelessly networking these types of devices has the advantages of patient mobility, device mobility and central data storage. This has led us to develop wireless sensors, gateways, servers and clients to support legacy medical devices. In this paper we present results from a hospital usability trial of this newly developed technology. We present the final wireless sensor network architecture used in the trial which also supports other compatible sensors we have developed. This also includes the architecture detail that supports the addition of future medical devices.