J.Jpn. Surg. Soc.. 58(12): 1942-1955, 1958
STUDIES ON EXCLUSION OF ELECTRICAL INTERFERENCES AGAINST MICROELECTRIC RECORDING DURING OPERATION
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1) Surgical Center, University of Tokyo Hospital Kazuo TAKEUCHI1), Fumio SATO1), Kentaro SHIMIZU1), Seiji KIMOTO1), Hideo YAMAMURA1), Shigeru HATANO1), Tadanobu TAKAGI1), Takefusa SAKAMOTO2), Sueo TAKAGI2) |
(A) Interferences by the alternating current
(1) Electrostatic interferences
By means of perfect shielding and grounding of "rouverall" of the luminous ceiling, electrical interferences by general illumination of the operating room, shadowless light for spot illumination, exposed part of cables and wires of the alternating current were sufficiently controlled. According to the authors' experimental study, either the number of surgical and anesthetic apparatuses or the number of persons present in the operating room must be kept as small as possible. Moreover, dresses of persons present in the operating room must be kept as thin as possible. Nylon and wool dresses should not be used. Electrostatic activity can be grounded through conductive rubber sole of shoes and conductive floor. Same material should be used for scalp electrode and indifferent electrode placed on the ear lobe and electrical differences between them should be omitted.
(2) Leakage current
In the "dry system" operating room interferences by leakage current is not so important because the humidity is much lower than that of the "wet system operating room". Besides the humidity of the operating room must be controlled by air-conditioner.Operating table must be grounded in order to catch the leakage current.
(3) Interferences by application of the transducer of other apparatuses
Potentiometer, ear-oxymeter, photoelectric plethysmograph, etc. also give electrical interferences by application of their transducers. Detachment or grounding of transducers are occasionally necessary in order to obtain the better recording.
(4) Electromagnetic interferences:
There was no important problem worthy mentioning.
(B) Interferences by high-frequency waves:
Electrosurgical unit gives the uncontrollable interferences.
(authors' abstract)
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