The flexibility depends on the specific brand and formulation. Although poly vinyl chloride is one of the most frequently used catheter materials it is relatively rigid and requires the addition of a plasticizer such as di 2 ethylhexyl phthalate dehp to increase its flexibility. Polyvinyl chloride pvc is commonly used as a catheter material in catheters for clean intermittent catheterization cic but owing mainly to environmental concerns a pvc free material has been proposed.
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