Microwave acupuncture microwave instrument is the modern technology and ancient acupuncture technology combined with our treatment of the characteristics of new medical equipment. In addition to its traditional role of needle treatment, there are the thermal effects of microwave, non-thermal effects, electromagnetic effects and acupuncture effect. Less microwave acupuncture needles, some intractable diseases such trigeminal neuralgia, sciatica, and other significant effect of facial paralysis. Microwave instruments are commonly used in acupuncture and acupuncture are continuous wave instrument. The disadvantage is that the depth of light through heat, radiation with a spiral head for the diagonal stabbing difficult. The machine uses pulsed microwaves, can make up for these shortcomings.
Design principles:
After the absorption of microwave energy tissue temperature rise caused is conditional. Only when the microwave energy over a certain power, the local tissue absorption of microwave energy into heat by more than the organization in the region metabolism, blood circulation, and environmental Diaspora (conduction, convection, diffusion) of the heat away, the only cause the local tissue temperature.
Microwave energy into the body of an organization (such as muscle tissue), the energy will quickly decay. Improve the thermal depth of penetration is not the best way to reduce work efficiency, or increase the input power, and average power using the same power as the original CW microwave pulse power modulation. Pulsed microwave acupuncture device is made according to the principles of design.
Structure and circuit:
Microwave acupuncture instrument used in the overall structure of the center of power in the form on the upcoming DC power modulation circuit and micro-tert-oscillator circuit machines were installed in the respective box. DC power supply and modulation circuit can supply 3 to 4 channels. Compact microwave oscillator, can be placed near the patient to reduce the high frequency cable loss of microwave power. Currently used for high-frequency coaxial cable, the loss per meter of about 1.5dB. If shortening the cable 80cm, equivalent to increase the power level of 30%. This is the source of oscillation in terms of low power is considerable. To ensure the stability of output power, the aircraft with high stability DC power supply.
The operating frequency of microwave signal 915MHz, we can see from the microwave properties of biological effects, 1000MHz microwave signals about a greater impact on the human body, can play a better therapeutic effect. Microwave on the human body in terms of penetration depth, focusing property is, or from the body's absorption of microwave, heat efficiency, it is appropriate to the frequency.
The original microwave oscillator circuit is shown in Figure 40-1, the circuit with distributed parameters and lumped parameter combining circuit common-base throwing carat form.
Use high-frequency power transistors VT1 3DA89C, the cutoff frequency up to 1300MHz, the power is 7.5W. R1 and R2 use metal film resistors are 10O and 470O, R3 is 2.2kO potentiometer. L1, L2, L3 are the high-frequency chokes are enameled with F0.5mm cylindrical insulator in F2mm around 10 laps. To 3300pF feedthrough capacitors C1, C2 22pF ceramic capacitor is, C3 for the 1 ~ 5pF air variable capacitor.

X1 and X2 are microstrip impedance transformation from the role. X1 thick 1.5mm, width 10.8mm, length 20mm PTFE printed circuit board composition. X2 for the use of thick 1.5mm, length 35mm, head and tail width and 4.125mm, respectively 20.25mm PTFE printed circuit board index composed of microstrip lines.

The principle of single DC power supply as shown in Figure. High stability of the DC power supply circuit for the microwave signal source circuitry. Stable DC output voltage is-28V.
Pulse modulation is an important part of the machine, used to modulate the microwave power output. Pulse should enable transistor VT1 deadline and work to achieve reliable two-state, needs to pay attention to adjust the pulse frequency and duty cycle.
Pulse generator for use 5G1555, the circuit is shown in Figure , mainly composed of a time-base integrated circuit 5G1555. Operating frequency is selected as 100Hz, 400Hz, 700Hz and 1000Hz are several, duty factor of 1.0% to 90% continuously adjustable. Average power output of pulse frequency and amplitude depend on duty factor to regulate.
Acupuncture needles connected with the radiation head, also using microstrip structure. Length in accordance with the materials used, the preliminary calculations to determine media thickness adjusted by experiment. Experiment, the control of radiation head VSWR less than 1.5. To reduce the environmental radiation leakage, the microstrip line covered with a thin copper outer shield. Microstrip using a micro coaxial cable connector and the signal source through the thin connections.