The new measuring method of a current for an electrosurgical knife has been investigated by detecting the electromagnetic wave radiated from the current cable. We found that a coaxial cable which was put near the current cable could detect the current wave form with ease. However, the absolute value of current can not be obtained from the current wave form detected by the coaxial cable. Thus, we tried to measure the absolute value of current by using the small coils. The absolute value of the current in the cable has been calculated from the induced electromotive force detected by the coil which is put near the current cable. In this paper, we mention the possibility of continuous intraoperative monitoring of the current which is flowing in the cable of the electrosurgical knife.

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In recent years, great importance has been placed on quality assurance and quality control for medical imaging equipment. Quality control for diagnostic X-ray equipment is largely dependent on how users maintain radiological equipment. Tokyo Metropolitan University and 13 other facilities formed a partnership to establish the Metropolitan Area Diagnostic X-ray Equipment Quality Control System, which they used on 25 diagnostic X-ray equipments over three years. Using noninvasive type instruments that was calibrated at Tokyo Metropolitan University, they measured X-ray tube voltage, X-ray tube current, radiation dose, and other parts and functions of X-ray equipment that affect performance using the same diagnostic equipment and according to the same protocol. The results indicated that testing could be carried out in all test categories with a high degree of accuracy when performed under the same conditions and that quality control was possible at all facilities in the metropolitan area. Continued implementation of the quality control system will not only insure that X-ray equipment maintain a high degree of performance and contribute to the early detection of equipment breakdown, but will also be effective in comparing how maintenance is carried out at different facilities, quantifying X-ray imaging conditions, and reducing patient exposure doses.

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Objective of this study is to introduce the successful review and improvement of maintenance management of incubators in our institution. In accordance with the present Medical Care Low in Japan took effect on April 1^st 2007, the method and cost-effectiveness in maintenance management of incubators in our institution was comprehensively reviewed since May 2009. In our institution, there were 33 incubators of 7 models manufactured by 2 makers. After making our original manuals of maintenance of incubators based on manufacturers′ introduction, medical engineers were trained by that. Thereafter, cost effectiveness between commercial and self-maintenance management was evaluated. Subsequently, it was revealed that maintenance management of incubators by employed medical engineers was 33% cost saving in comparison with that of commercial one. Additionally, 99.7% cost saving was obtained by using “hook slider” which was seal material to prevent degradation in expendable parts of incubators. Thus, in maintenance management of incubators in accordance with the present low of medicine, self-management of these followed by making institutional manuals and education of staffs might be further cost-effective than conventional method by manufacturers companies.

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An attempt to observe the characteristic change of total lipid in B. stearothermophilus and of B. atrophaes by the plasma discharge sterilizing technique in the presence of hydrogen peroxide vapor at lower temperature has carried out.
At first step, 10mL of B.stearothermophilus and of B.atrophaeus incubated solution (10⁷/mL) in glass vial tube were divided to 5mL X 2 tubes and were weighed, respectively. These samples were dried up by the centrifugal freezing technique at reduced pressure. One of these bacilli were sterilized (Sterilized sample) and another tube was stood (Non sterilized sample, Blank). Total lipid of these bacilli was extracted by the Folch's solvent (chloroform, 2 vol./methanol, 1 vol.). After this mixed solvent was also removed by the above mentioned dry up method, and all residue of these bacilli was treated by methanolisis. These esterified samples were analyzed by gas chromatography.
It is observed that the main component of the extracted lipid of these bacilli is linolate (C_{18 : 2}) and that B. stearothemophilus is more sensitive than B. atrophaeus on the resistance against this sterilizing technique.

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