Infusion catheter assembly with reduced backflow

摘要

Catheters assemblies having structural configurations operable to reduce backflow along the catheter assembly track, and methods of making and using such catheter assemblies. Catheters assemblies in accordance with embodiments of the present invention find use in various applications including the treatment of acute and chronic medical conditions. An exemplary catheter assembly includes, in one illustrative embodiment, a flexible proximal catheter body portion, and a distal portion of a smaller diameter than the body portion. The distal portion includes a sealed distal tip or end and one or more side flow openings to permit flow of therapeutic substance from the catheter along an axis that is different than, e.g., skewed relative to, a longitudinal axis of the distal portion of the catheter assembly.

主权项

1. A catheter assembly comprising:
a flexible tubular catheter body having proximal and distal ends, the body comprising an inner surface defining a lumen extending between the proximal and distal ends; and a rigid tubular needle partially located within the lumen of the body and extending outwardly from the distal end of the body, the needle comprising:
a nonporous outer surface defined by a diameter that is less than a diameter of an outer surface of the body;a proximal end comprising a flange having a diameter larger than the diameter of the outer surface of the needle, the flange fixed relative to the inner surface of the body; anda sealed distal tip located a preset distance beyond the distal end of the body, the needle defining a side flow aperture formed along the outer surface of the needle and proximate to, but offset from, the sealed distal tip, the side flow aperture in fluid communication with the lumen of the body; and a guide tube interposed between the proximal end of the needle and the inner surface of the body, wherein the proximal end of the needle is fixed directly to an inner surface of the guide tube and the guide tube is fixed to the body.