The original coil emboli were designed for untapered-lip catheters. New coils have been designed for tapered-lip (1mm) catheters and have two helical diameters of 3 and 5 mm, respectively. The adaptation of the new coil to a tapered-tip catheter greatly simplifies its use in arterial occlusion.
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Chuang et al. (1980) studied this question.
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