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[en] SummarySelected issues regarding radiological placement of CVA devices have been reviewed with emphasis on those aspects that place an interventional radiologist in the unique position of being able to offer an all-inclusive VAS, the quality of which equals or exceeds that of other specialists providing venous access, and may offer it at a lower cost.
[en] A method for the choice of the dose of treatment in radiation sterilization is proposed. It appears possible to validate doses lower than the usual value of 25 kGy by using a substerilizing dose to determine an intermediate level of sterility assurance level (SAL), after elimination of the most radiation-sensitive contaminants, and by extrapolating for this intermediate SAL to the required level, on the basis of an assumed maximum value of the D10 for the remaining contaminants. This can be done by sterility testings on 3 sets of 50 samples, among which two sets are irradiated at two suitably chosen substerilizing doses. Such a procedure will allow, in most cases, the use of a smaller sterilization dose. It will then significantly reduce the cost of the process by a limited amount of experimental testings, and will be useful for limited series of production. 8 refs.; 8 figs.; 6 tabs
[en] A rotating superconductor magnet is described for producing a rotating lobed magnetic field, comprising a cryostat; a superconducting magnet in the cryostat having a collar for producing a lobed magnetic field having oppositely directed adjacent field lines; rotatable support means for selectively rotating the superconductor magnet; and means for energizing the superconductor magnet
[en] The past and present status of microbiological criteria for radiosterilization is surveyed, outlining microbiological procedures proposed or used for selecting sterilizing doses, controlling sterilization, and checking sterility. Differences of opinion on questions of international standardization are noted and a possible method of dealing with checklists is proposed. (author)
[en] Broad review of different (physical, chemical and mechanical) methods commonly used for medical materials sterilization have been performed. Among them the special attention have been played on radiosterilization. The advantages and weaknesses each of the presented method have been pointed out. 1 fig