Catheter testing system and uses thereof

A device for collecting biological sample from the interior of a catheter, comprising

• a catheter hub, wherein said catheter hub is hollow and has therein a catheter hub proximal opening and a catheter hub distal opening, wherein said catheter hub distal opening is configured to engage a catheter opening;
• a sheath, wherein said sheath is tubular in shape and has therein an open sheath distal end, a sheath proximal end compartment, and a closed sheath proximal end and an open sheath distal end, wherein said open sheath distal end is securely positioned along the outside of said catheter hub proximal opening;
• a sheath ring, wherein said sheath ring is hollow and ring shaped, wherein said sheath ring is positioned on the outside of said open sheath distal end and catheter hub proximal end so as to secure said open sheath distal end on the outside of said catheter hub proximal end;
• and
• a brush, wherein said brush comprises a bristle section, an extended body, and a brush handle, wherein said brush is positioned within said sheath such that said handle is positioned within said sheath proximal end compartment and said bristle section is positioned near said open sheath distal end such that said bristle portion may be advanced or withdrawn through said catheter hub.