Patent ID: 7896853

Claim:
A proximal insert for a coaxial catheter, comprising: a body, having a proximal end and distal end, comprising: a first passageway extending from a first opening on the distal end of the body to a second opening on the proximal end of the body and configured to receive an inner lumen of a coaxial catheter; a shoulder on an outer surface of said distal end, positioned proximate said first opening, wherein said shoulder is configured to abut a wall of an outer lumen of a coaxial catheter; and a second passageway extending from said first passageway to a third opening, the first passageway having a first cross-sectional area from the distal end of the body to the second passageway and a second cross-sectional area from the second passageway to the proximal end of the body, the first cross-sectional area larger than the second cross-sectional area, the second cross-sectional area substantially the same as an outer wall of the inner lumen.