Based on the wireless radio frequency technology for unattended ward care system design (1)

Body temperature, heart rate and breathing frequency and so three physiological parameters in the body is the most important and most basic vital signs. For staff to undertake a number of vital signs monitoring environment conducive to the timely and effective treatment, but most of the monitoring system in our country are artificial bedside custody and guardianship of the cable way to bed, the former waste of human resources, and reliable low cost high; the latter, wiring difficulties. This is an urgent need both to reliable care patients, but also can save resources of guardianship. This article describes the unattended ward care system is designed to meet such needs, the system uses the bio-medical sensors on the patient's body temperature, heart rate (pulse), respiratory rate and other physiological parameters for real-time detection and inspection data through wireless RF module is sent to the monitoring center, real-time monitoring of the patient's body, saves resources, improving the quality of medical services, hospital management, and easy installation, low cost, easy to use.

1. system composition and working principle

Unattended ward care system mainly by the data collector, wireless RF module SRWF-106, monitoring, computer parts, structure diagram shown in Figure 1.

Wear in the patient's data collector set heart rate sensor, respiratory frequency sensors and temperature sensor and other biomedical sensors in one, it can monitor the patient's heart rate, respiratory rate and body temperature, and other physiological signs, and through the FRAM record data collection time, and then through the wireless RF module SRWF-106 real-time sent to the Centre unit monitor to the computer.

If a unit of data sent to an exception for an indicator, the system will alarm alert monitoring personnel to the patient to take timely measures to compare the treatment of patients in a timely manner, ensuring the safety of patients and to improve the efficiency of the monitoring. Of course, the monitoring personnel are also available for monitoring computer database data index, targeted on certain physiological signs of patients analyzed, timely parameter change treatment or advance on disease prevention and control for effective and thus maximum guarantees for the rights and interests of the patient.

2 system hardware design

2.1 data acquisition hardware design

Data collector wear in patients mainly completed patient physiological signs parameter collection, processing and storage capabilities, the sensor microprocessor circuit, as well as Fram.

Sensor including temperature sensor DSl8820, HK-2000A-integrated pulse sensors, HXB-2 piezoelectric breathing sensor and other question extend sensor, microprocessors use PLILIPS high-speed, low power, 8-bit FLASH microcontroller LPC932, fram selects RAMTRON corporate integrated clock circuit FM31256. Data collector electric schematic diagram shown in Figure 2.

Will connect to the data collector on the digital temperature sensor DSl8B20, HK-2000A-integrated pulse sensor and respiratory HXB-2 piezoelectric sensors, respectively, as required, install to a patient's body of related parts, and then open the data collector, began collecting patient signs parameter, together with data acquisition time and stored in fram FM31256, at the same time start the radio frequency module SRWF-106, in real time the number of hospital beds, acquisition time and monitoring data is sent out, flashing red LED indicates data transfer D3.

When battery voltage of power supply is insufficient, the microcomputer is interrupted LPC932 comparison occurs when the yellow LED flashes indicate that the D4 remind staff to replace the battery, improves data acquisition device reliability.

2.2 wireless RF module SRWF-106 usage