| IntroductionThe long tube bone fracture of four limbs is the most common damage in the wound orthopedics. It is a kind of commonsense method of treating the fracture that the small splint is regular. It is often used for the simple four limbs fracture, for instance forearm fracture, shank fracture, etc., the small splint is regular with its peculiar advantage, accepted by domestic doctor of dept. of orthopedics and vast patient, and approved by international counterpart's scholar.In the region there has been a disturbing problem that the adjustment over the degree of tightness of the bandage depends on the doctor's experience and feel. It is suitable for elasticity to move about 1 centimeter from head to foot, it is probably strength of 800~1000 carats through determining. This is only a doctor's subjective feeling after all, and it is very apt to cause the fault which must consequentially cause the difference of the regular elasticity of the splint, influence the fracture fixation and its heal, and it is even apt to cause the serious complication.This article has proposed a new kind of automatic monitoring little splint, which is a real-time monitoring system through clinical observation and consideration for many years. The system is a collection of sensing technology, information process technology and single chip microcomputer technology. The system achieved the dynamic real-time monitoring, using advanced and sensitive force sensors, unique battery supply power and voltage monitor circuit module, the accurate data display module, and sound and light warning module. Then the elasticity of the splint is quantized, and both the doctors and the patients can use the result.System Design of Automatic Monitoring Little Split For MedicineThe automatic monitoring splint designed in this article mainly includes the signal process circuit, the A/D convert circuit, single chip computer interface circuit, display circuit, keyboard circuit, the sound-light warning circuit, voltage of power monitoring circuit, in-circuit restoration circuit etc.. Its systematic block diagram is as Fig. 1 shows.Fig.1 Systemic diagram(1) Sensor selection.To satisfy the technical index of this article, we need a sensor with high- precision, wide measure range, and good frequency respond characteristics. FS series sensor of Honeywell is selected in the article.(2) Signal process circuit design. The full scale output of the sensor is 180mV, and the maximum input voltage of MAX187 is 4. 096V. Consequently the systemic gain of the signal process circuit is Av=4. 096V/180mV=22. 76. LM358 is used as the amplifier in the circuit.(3) A/D conversion circuit. To achieve the goal of wide measure range and high-precision, the system selects MAX187 as its A/D converter, which helps to guarantee the measure precision and real-time quality, save the I/O line number, and reduce the volume of the instrument.(4)Data display and warning circuit. The automatic monitoring little splint use battery as its power supply, which requires data displayer and warning circuit should have extremely low power consumption. Therefore the displayer choose EDM1190 liquid crystal display module, which includes LCD displayer, drive circuit and CPU interface, and adopts serial shift control mode. The warning mode of the system adopts the sound-light warning, including power down of the battery, the state of the system and ultra limit warning modes. For the need of economizing on electricity, the light warning is realized by LCD display while the sound warning realized by the music chip.(5)The power module Because the sensor, amplifier, A/D changer and AT89C2051 single-chip computer all adopt 5V power, the system adopts two 1.5V lithium battery as the supply power, considering the capacity and specification of the battery. Therefore MAX619 DC-DC charger is used to solve the problem of systematic power. To guarantee the system works normally and reliably, the voltage of the battery should be monitored. The sample value of the b...
|
PDF Full Text Request