| CPC A61B 1/005 (2013.01) [A61B 1/00062 (2013.01); A61B 1/04 (2013.01); A61B 1/05 (2013.01); A61B 1/0684 (2013.01); A61B 1/07 (2013.01); A61B 1/12 (2013.01); B25J 9/1689 (2013.01)] | 14 Claims |

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1. A system comprising:
a catheter including a wall having an inner surface defining a main lumen; and
a device including:
an elongate flexible shaft configured to be slideably inserted within the main lumen; and
a structure coupled to an outer surface of the elongate flexible shaft, wherein the structure is configured to engage with a plurality of flat surfaces comprising a portion of the inner surface to prevent rotation of the elongate flexible shaft within the main lumen, wherein the structure includes an inner wall that engages with a portion of the outer surface of the elongate flexible shaft, the inner wall having a shape that makes up a portion of a circle.
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