Research Group of Acupuncture Anaesthesia, Chaoyang Hospital, Beijing
From the neurophysiologic point of view, the stimulating effects of electric needle in acupuncture anesthesia is a kind of induced effect causing transmission of nerve impulse. It is not necessary to provide stronger power output in the design of acupuncture anesthesia instrument as for electric therapy or electric anesthesia. Since 1966, we have successfully applied the instrument with intermittent oscillator as the main oscillating circuit to the operations under acupuncture anesthesia. For more than 10 years, the fundamental circuit design was mostly used in various types of acupuncture anesthesia apparatus developed.
The impulses generated by that apparatus have the following characteristics:
1. High pulse amplitude, usually reach to 1-200 V (peak-to-peak pulse amplitude).
2. Pulse width range small, within 0.2-0.5 ms.
3. Accumulating volume of DC component is small, even could be neglected, thus, there are no burns and electrolysis produced.
4. High output impedance.
In order to observe the relationship between the stimulating parameters of electric needle and the effects of acupuncture anesthesia, and to improve the stimulating parameters of electric needle, we simulated the acute trauma of surgical abdominal exploration as the pain stimulation, took the struggle reactions in experimental celiotomy of animal models as the pain index, through the quantitative calculation of the pain struggle reactions of the rabbit during the course of operation under acupuncture anesthesia, we screened the parameters of the strength, wave width, duty ratio and frequency of electric needle, the results obtained as the following:
1. The main factor influencing the effects of acupuncture anesthesia among strength, wave width, duty ratio and frequency is the strength of stimulation.
2. The best stimulating strength chosen in this experiment is identical with the standard of stimulations selected in the clinical operations under acupuncture anesthesia, i.e. the largest stimulation strength which could be tolerated by the patient.
3. The relationship between the variation of the frequency within 10-100 kHz and the effects of acupuncture anesthesia was not correlated markedly, thus, the determining factors of frequency. i.e. the combination of wave width and duty ratio, should be further studied in the future.
From the neurophysiologic point of view, the stimulating effects of electric needle in acupuncture anesthesia is a kind of induced effect causing transmission of nerve impulse. It is not necessary to provide stronger power output in the design of acupuncture anesthesia instrument as for electric therapy or electric anesthesia. Since 1966, we have successfully applied the instrument with intermittent oscillator as the main oscillating circuit to the operations under acupuncture anesthesia. For more than 10 years, the fundamental circuit design was mostly used in various types of acupuncture anesthesia apparatus developed.
The impulses generated by that apparatus have the following characteristics:
1. High pulse amplitude, usually reach to 1-200 V (peak-to-peak pulse amplitude).
2. Pulse width range small, within 0.2-0.5 ms.
3. Accumulating volume of DC component is small, even could be neglected, thus, there are no burns and electrolysis produced.
4. High output impedance.
In order to observe the relationship between the stimulating parameters of electric needle and the effects of acupuncture anesthesia, and to improve the stimulating parameters of electric needle, we simulated the acute trauma of surgical abdominal exploration as the pain stimulation, took the struggle reactions in experimental celiotomy of animal models as the pain index, through the quantitative calculation of the pain struggle reactions of the rabbit during the course of operation under acupuncture anesthesia, we screened the parameters of the strength, wave width, duty ratio and frequency of electric needle, the results obtained as the following:
1. The main factor influencing the effects of acupuncture anesthesia among strength, wave width, duty ratio and frequency is the strength of stimulation.
2. The best stimulating strength chosen in this experiment is identical with the standard of stimulations selected in the clinical operations under acupuncture anesthesia, i.e. the largest stimulation strength which could be tolerated by the patient.
3. The relationship between the variation of the frequency within 10-100 kHz and the effects of acupuncture anesthesia was not correlated markedly, thus, the determining factors of frequency. i.e. the combination of wave width and duty ratio, should be further studied in the future.
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