US Patent 7918831 Catheter assembly having protective sheath

Devices and methods are disclosed for a catheterization process, particularly useful for self-performed catheterizations. A catheter is enclosed in a sheath made from a gas-permeable material. This sheath maximizes gas permeability to prevent air build-up at the distal end of the sheath, resulting in easy self-catheterization for even those with limited manual dexterity.