Medical device tubing with discrete orientation regions
View Patent ↗Medical device polymeric tubing segments suitable for forming catheter shafts or as balloon parisons are formed with discrete regions having different orientation relative to each other. Wall thickness may also be varied of the length of the segment.
1. A polymeric tubing segment, the tubing segment comprising first, second and third regions disposed sequentially along the length thereof,
wherein the polymer disposed in said first region has a different longitudinal extruded orientation from the polymer disposed in said second region and
said different longitudinal extruded orientations provide an elongation at yield of the polymeric material in at least one of said regions that is at least 20% less than the elongation at yield of another of said regions, and wherein
the tubing segment is a parison for a catheter balloon,
the polymer disposed in said second region has a higher or lower longitudinal extruded orientation relative to the polymer disposed in both of the first and third regions, and wherein
the polymeric tubing is produced by extrusion wherein the extrusion is controlled to provide the difference in longitudinal extruded orientation of the polymer between the second region and the first and third regions.
2. An extruded polymeric tubing segment as in claim 1 wherein the tubing material is a single polymer.
3. An extruded polymeric tubing segment as in claim 1 wherein the tubing is a coextruded laminate of at least two different polymers.
4. An extruded polymeric tubing segment as in claim 1 wherein the tubing material comprises a polymer blend.
5. An extruded polymeric tubing segment as in claim 1 wherein said first and second regions have different wall thicknesses relative to each other.