Abstract
HAVING been found to be of great convenience in intravenous therapy since their introduction into clinical use, thin-walled plastic catheters are in many ways superior to needles by virtue of their flexibility, their length and their tissue acceptance for prolonged periods. They are able to remain in a vein up to three weeks without causing thrombosis1; thus, they can prevent many a painful moment in chronically ill and debilitated patients and those on prolonged intermittent therapy, especially when the time arrives for that last elusive vein. A catheter introduced percutaneously fairly high up into a vein seems to be . . .

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