Infusion remote monitoring system based on power line carrier technology
The power network is a popular physical network for users. Its user usage group is unmatched by any network, and the existing main use of the power network is to transmit power. How to make use of the potential of power network resources to achieve narrowband or broadband communication without affecting the transmission of electrical energy, making it another communication network after telecom, telephone, wireless communication and satellite communication. Another goal of tackling the problem. Power line carrier communication is a carrier communication using a power line as a transmission channel, and is a communication method unique to a power system. Compared with other communication methods, power line carrier communication has its own unique advantages. It does not require wiring construction, the network extends widely, and the existing network has stable and reliable guarantee. Therefore, it is necessary to use power line communication to realize communication and monitoring in medical equipment. Very practical and promising.
1. Infusion liquid remote monitoring system overall design
The function of the infusion remote monitoring system mainly has two aspects: on the one hand, the liquid level information of the patient drip bottle is collected in the ward, and the local alarm is given at the end of the infusion, causing the attention of the patient and the patient's family; on the other hand, the nurse observes the patient in real time on the workstation. Infusion state, after receiving the alarm signal, it can be processed in time to realize remote monitoring of infusion.
This design divides the infusion remote monitoring system into two parts according to function, and some of them are installed in the ward, which is called the ward infusion information collector (lower position machine), and collects the liquid level information of the patient. The other part is placed at the nurse station, monitored by the nurse on duty, accepting the data uploaded by the collector and the end of the infusion alarm. This part is called the infusion monitoring control center. The specific structure is shown in Figure 1.
2. Partial hardware design of carrier communication controller
Both the infusion collector and the infusion monitoring and control center require a carrier communication system, but the infusion information collector increases the infusion information collection and control functions.
2.1 Communication system structure
In this system, the SC1128 with spread spectrum communication function is used as the power line carrier chip, and the AT89C51 is used for communication control and infusion information collection (in the lower computer) chip, and the point-to-point communication is first performed by using the RS232 port. 2 is a hardware block diagram of a communication system.
As shown in Figure 2, the signal enters the SC1128 chip from the power line through the coupler, bandpass filter, and preamplifier. After being processed by the microprocessor, the data is sent to the upper computer to complete the reception. The signal is sent to the power line via the power amplifier and coupler via SC1128 for transmission.
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