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is retained by means of a balloon at the tip that is inflated with sterile water. The balloons typically come in two different sizes: 5 cm³ and 30 cm³. They are commonly made in silicone rubber or natural rubber.
*An intermittent catheter/Robinson catheter is a flexible catheter that is removed after each use. Unlike the Foley catheter, it has no balloon on its tip and therefore cannot stay in place unaided. These can be non-coated or coated (e.g., hydrophilic coated and

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