A system includes a member having a lumen； and a stabilizer positioned at a distal end of the lumen, wherein: the stabilizer includes at least two radially-inward projections circumferentially spaced apart from one another at the distal end of the lumen； the at least two radially-inward projections defining an opening at the distal end of the lumen； and a cross-sectional area of the opening is less than a cross-sectional area of the lumen.
