The scanning electron microscope was used to study the surface characteristics of angiographic catheters and guide wires. All catheter surfaces examined exhibited manufacturing imperfections such as fissures, depressions, protrusions, and scratches. The external surfaces of stainless steel and Teflon-coated guide wires vary according to the manufacturing process. Guide wires cleaned after clinical use show retention of blood elements and debris. It is recommended that a new guide wire be employed for each patient.
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Anderson et al. (1974) studied this question.
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