Based on the ARM processor in the system design of microwave thermotherapy device (1)

Introduction

With the development of science and technology, a variety of medical devices were invented and used widely.

Of these, microwave treatment [1] [2], with its excellent hemostasis, tiny tissue damage, etc., application in the medical industry for many years, its efficacy has been affirmed by the medical profession. Microwave role in body tissue, it may cause tissue cells, water molecules and dipole of high-frequency oscillation. When you use low-dose microwaves, it produces low thermal effects, enhanced patient affected by blood circulation, accelerates metabolism, enhance immunity, thus facilitating absorption, anti-inflammatory analgesic edema; when using high-dose microwaves, it will generate high heat, bring protein denaturation, solidification, necrosis, in which case the microwave with a "burning" and "cut".

Microwave therapy instrument is a biological characteristics using microwave on various diseases for the treatment of the medical device, it combines microwave, sensors, automatic control, computer software and hardware and other high-tech technology.

Market microwave therapy instrument of control system for most of the microchip, the prevalence of operation red, no graphical interface, display not intuitive disadvantages. While using the PC as a control-and increases heat therapy apparatus equipment costs. These factors impeding the rapid popularization of the application.

Because the ARM embedded technology enables control system miniaturization, and developed products to powerful, low cost, high performance-price ratio.

Therefore, according to microwave hyperthermia instrument of market needs, has developed a new type of embedded systems based on arm [3] [4], configure wince.net operating system [5] of microwave hyperthermia equipment. This application uses the Embedded Visual C ++ tool [6], the product can real-time monitoring of the human body temperature, a microwave, Ablation of the needle. The system has control integration, stable operation, convenient and intuitive graphical interface display characteristics.

1 hardware system

1.1 hardware features

Microwave is a microwave energy for microwave scalpel surgery.

It consists of a frequency of 2000 MHz, power» 10000 70 ~ 150 W continuous adjustable microwave power source, through the transmission lines and surgical tool connected. Microwave sources produce energy through transmission lines, along with surgical tool enters the surgical site, implement operation purposes. It has a good effect on hemostasis, don't carbonating, edgy, prevention of surgical sterilization and infection, and other characteristics, and small size, flexible operation. Ablation technique is to make microwave therapy source through human natural intestines, accurate point of intervention to local lesion, automatic precise control of its treatment of power, time and treatment technologies. Used needle ablation can not open cases on conditions for effective treatment, pain.

This system of microwave transmitter can add microwave and ablation needle, work as follows:

(1) microwave: surgery microwave in use, the user through the man-machine interface control of microwave output power, and the system automatically accumulated microwave run times for medical records.

(2) ablation needle: ablation of needles to hyperthermia, users can pre-set ablation needle run power, time and temperature warning, the system uses the countdown calculated ablation needle elapsed time, time to zero, the system automatically cut off power output.

Treatment process, in order to prevent patients treatment position of temperature is too high, causing damage to the Organization, the system can also monitor the affected by temperature change, when the temperature is higher than detected alarm temperature, the system automatically lower the power output of needle ablation; when detected temperature returned to normal after system restore ablation pin output power to pre-set values.

1.2 hardware components

The hardware system is divided into three parts, namely embedded system module, temperature acquisition and control module and microwave sources.

Figure 1 is a system of hardware chart.

Figure 1 hardware system chart

1.2.1 embedded system module

Embedded system module structure as shown in Figure 2, module using Samsung S3C2410 ARM9 series of microprocessors, including the RAM and 64M 64M Flash.

Embedded system modules add a Sharp company 10.4 inch LCD monitor, the resolution of 640 × 480, as the system of human-computer interaction platform for users to operate the use.

Figure 2 embedded system module structure diagram