Cannular device and method of manufacture

摘要

A cannula comprising a polymeric material which is phthalate-free, yet retains flexibility, workability and elongation properties so as to avoid kinking when bent. Also disclosed is a method of manufacturing a cannular device comprising extruding a flexible, biocompatible, phthalate-free polymeric composition through a round die into a tube, pulling the tube through a water bath at a rate established according to a predetermined function, and cutting the tube to for a cannular device, wherein the predetermined function periodically modulates a pulling rate.

主权项

1. A cannular device, comprising:
a polymeric conduit defining an inner lumen, a proximal end having a proximal opening, and a distal end having a distal opening arranged so that the inner lumen extends from the proximal opening to the distal opening, wherein the polymeric conduit comprises a biocompatible polymeric composition free of phthalate containing materials, wherein the polymeric conduit is arranged to have a circular cross-section defining an inner diameter and an outer diameter, the circular cross-section diminishing in size from the proximal end to the distal end from a first inner diameter and first outer diameter to a second inner diameter and a second outer diameter, the first inner diameter being larger than the second inner diameter and the first outer diameter being larger than the second outer diameter, wherein the polymeric conduit is adapted to provide means for resisting kinking so that the inner lumen remains free from obstruction when tested according to the 180° bend test, wherein the inner diameter diminishes according to a first continuous function, the function providing a gradual diminution of diameter from the proximal end to the distal end, and wherein the outer diameter diminishing according to a second continuous function, the function providing a gradual diminution of size from the proximal end to the distal end.