Transcript
A Wireless Based Sensor for Patient Monitoring System with Remote Diagnostic Hung-Chieh Yu Department of Electronic Engineering National Taipei University of Technology Taipie 106, Taiwan
[email protected]
Abstract In this paper, We propose a mobile Patient System using common approach Sensor Platform called The wireless based Patient Sensor platform (WSP, Sensor Node) which has remote access capability. The goals of the WSP are to establish: Standard sensor node (System on module), a common software .The proposed platform architecture(Sensor Node) offers flexibility, easy customization for different Vital parameter collecting and sending . An prototype has been established based on wireless communication channel. Wireless Lan ( IEEE802.11) [1] and WMTS[2] has been used as communication channel on our prototype (Sensor node) . Desire sensor information(vital parameter) can be viewed remotely, and also vital parameter can be adjusted to meet demand.
Shu-Ming Tseng Department of Electronic Engineering National Taipei University of Technology Taipie 106, Taiwan
[email protected]
like temperature,blood pressure, ECG ,SPO2 continuously.
etc.
2. Patient monitoring system 2.1. Overview of patient Monitoring system The target of this study is to design and provide a reference design and implement a mobile system for monitoring Vital signs .Fig1 shows the architecture of proposed System . Doctor’s or Nurse PDA or Laptop Patient monitoring device IWSP
1. Introduction Through the Wireless sensors, and Sensor network, Whether it is an ECG, blood pressure values, blood glucose level, pulse oximeter, weight, or other vital signs. All those Vital parameter are effectively transferred to a monitoring center enabling accurate diagnosis. The patient information and the transmitted data can be viewed locally or via the Web. We introduce a concept of reference design which called Wireless Patient monitor sensor platform (WSP) architecture, WSP offer flexibility of reducing development time . The WSP firmware automatically sends different types of warning and notifications to desir destination, or as e-mail directly to Doctor ‘s PDA/Laptop by using Open standard transportation protocal and leave Voice message . WSP can Continuously do health monitoring and control. The WSP firmware monitors all important vital parameters
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infrastructure network
Hospital Medical management system
access point application
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Fig. 1. Patient Monitor System Architecture 2.2. Sensor node platform architecture The Wireless Patient monitor sensor platform (WSP, Sensor node) is a “system on a module”, which defines
both the hardware and software for sensor Node. It uses a “reference Design ” approach, which consists of a Hardware Design implementation guide, and an Software Development Kit . The goals of the WSP architecture are to establish: A general hardware, a common software to the proposed platform architecture(Sensor node).
2.2.1. Software develop kit WSP software Development kit (ISD) is based on a open software(i.e. Linux ).The WSP platform architecture includes a common method of Vital parameter management, Vital Event Action and it does define the message exchange over these Sensors Node .or, Doctor’s PDA. Following are the most features that will be provided in the standard WSP software for Sensor Node: 1. Provide Vital parameter data reporting and alert warning forwarding. 2. Provide mechanism for Turn on/ off Sensor node. 3. Provide and update Vital parameter threshold value to improve the precision. 4. Provide Software upgrade capability of platform (Sensor node). 5. Provide web-server for remote access. The WSP software Development Kit (ISD) is made up of several modules .for example like following. 2.2.1.1 Vital parameter date manager
Fig. 2. Wireless based Patient Sensor platform(WSP, Sensor node) Block Diagram Processors are embedded . In the WSP platforms, Processors are based on any type of micro-controller. WSP can support the following interfaces: Wireless Lan (IEEE-802.11), WPAN, GSM , CDMA,, Discrete I/O, and Serial bus. An WSP , for example, can uses the A/D interface to capture a lots of information such as analog signal like hear beat, blood Pressure , and temperature .There are also possibility for WSP platform to use the necessary filter, amplifier device to process any analogy signal for accuracy which derived from A/D interface. A Sensor node system is composed of a set of computing resource and IO resource. A computing resource contains the processor and memory. In contrast, an IO resource contains the Wireless Ethernet controller including (PHY and MAC ), and A/D interface or Signal & Control circuit to catch Vital parameter Signal. An WSP platform represent a single sensor node and is independent of other Sensor Nodes . Sensor Node monitor the status of the vital parameter signals , such as temperature, Heart rate ,SPO2 , blood pressure and so on, and report errors or different types of warning and notifications to desire destination, or as e-mail directly to Doctor.
The WSP firmware will provide Vital parameter monitoring through communication channel. Every vital parameter data will be described in the Vital Parameter repository(EEPROM) and can be accessed through the Web page . The status of of Vital Parameter of sensor Node can be discovered. Vital Parameters are ASCII based string ,stored in repository (EEPROM) ,and need to be interpreted by software. 2.2.1.2 Vital parameter scanner The Vital parameter scanner will be responsible for monitoring some Vital signal conditions. Temperatures, Heart beat and the like will be monitored by WSP firmware through specific interface like A/D and reported externally through serial or wireless channel.
3. Experimental results This design project was to develop a wirless , low power Vital parameter sensor node platform. A working System prototype has been established. as in Figure 3 .Our wireless solution use the TI’s TNETW1450 solution . The WLAN solution combines the TNETW1450 with the TNETW3422, a highly optimized 2.4GHz single-chip, radio frequency (RF)
transceiver/power amplifier and the TNETW3426 radio frequency front end (RFFE) that supports IEEE 802.11 b/g standards. This solution make connectivity for the WSP architecture , and reduce complexity of development. The core processor of our WSP is a low power 32 bit mic-controller(less than 5 watts )with 256 M on chip flash memory and 24 channel of 12 bit A/D converter, One USB channel ,and It realizes the WSP architecture as Sensor node for sending and collecting the Vital parameter.
4. Conclusion Flexible wireless platform (WSP) architecture actually establish: Comprehensive Hardware Design Kit with software tools .The proposed platform architecture offers flexibility, easy customization for any Vital parameter monitoring to be sensor node.
5. References [1] IEEE standard IEEE802.11. [2] Monitoring Patients via Radio Signals. About Wireless Medical Telemetry Service (WMTS).
Fig. 3. Prototype
