Cannular Device and Method of Manufacture
AssigneeMedtronic, Inc.
InventorsChristopher Alan Oleksy, Roger Warren Brink
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Abstract
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.
Claims16
1-22. (canceled)
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 form a cannular device;
- wherein the predetermined function periodically modulates a pulling rate.
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 form a cannular device;
- wherein the predetermined function provides periods in which the pulling rate increases from a minimal pulling rate to a maximal pulling and periods in which the pulling rate decreases from a maximal pulling rate to a minimal pulling rate so that the tube is formed having an oscillating cross-sectional diameter that changes with time;
- wherein the cut tube has a proximal end and a distal end, the proximal end having a first inner diameter and a first outer diameter defining a first thickness, the distal end having a second inner diameter and a second outer diameter defining a second thickness, wherein the second thickness is about 50 to about 95% of the first thickness.
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 form a cannular device;
- wherein the tube is adapted to resist kinking and to recover to full patency after being clamped to complete closure.
Dependencies are inferred from the claim text.