Catheter systems and methods for manufacture

Patent metadata

Field	Value
Publication number	US-9364360-B2
Application number	US-201414174077-A
Country	US
Kind code	B2
Filing date	Feb 6, 2014
Priority date	Feb 6, 2014
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A method for manufacturing a catheter, includes forming a mandrel by arranging at least first and second elongate members in an at least partial longitudinal juxtaposed relation with respect to a longitudinal axis defined by the mandrel, mounting an inner liner having an internal surface about the mandrel, treating the inner liner whereby the first and second elongate members of the mandrel cause irregularities within the internal surface of the inner liner, positioning an outer member about the inner liner and removing at least the inner liner from the mandrel, thereby forming a catheter having the inner liner with irregularities.

First claim

What is claimed is:

1. A method for manufacturing a catheter, the method comprising:
mounting an inner liner having an internal surface about a mandrel, the mandrel comprising first and second elongate members each at least partially wound relative to each other and about a longitudinal axis defined by the mandrel;
treating the inner liner whereby the first and second elongate members of the mandrel cause irregularities within the internal surface of the inner liner;
positioning an outer member about the inner liner; and
removing at least the inner liner from the mandrel, wherein removing the inner liner includes at least partially unwinding the first and second elongate members relative to each other and the longitudinal axis,
wherein a catheter is formed having the inner liner with irregularities.

2. The method according to claim 1 , further comprising forming the mandrel by at least partially winding the first and second elongate members relative to each other and about the longitudinal axis.

3. The method according to claim 1 wherein removing the inner liner includes transitioning the mandrel from a first condition having a first effective cross-sectional dimension to a second condition having a second effective cross-sectional dimension less than the first cross-sectional dimension, the second cross-sectional dimension of the mandrel being less than an internal dimension defined by the internal surface of the inner liner subsequent to treating the inner liner.

4. The method according to claim 1 wherein treating the inner liner includes subjecting the inner liner to thermal energy to facilitate at least partial penetration of the first and second elongate members within the internal surface to assist in forming the surface irregularities.

5. The method according to claim 4 wherein subjecting the inner liner to thermal energy includes heating the mandrel.

6. The method according to claim 5 including cooling the mandrel subsequent to heating the mandrel.

7. The method according to claim 6 wherein at least partially unwinding the first and second elongate members is performed subsequent to cooling the mandrel.

8. The method according to claim 4 wherein positioning the outer member includes mounting the outer member over the inner liner when the inner liner is mounted about the mandrel.

9. The method according to claim 8 including cooling the outer member during subjecting the inner liner to thermal energy.

10. The method according to claim 4 wherein the inner liner includes polytetrafluoroethylene (PTFE) and wherein subjecting the inner liner to thermal energy includes heating the PTFE to increase a density of the PTFE.

11. The method according to claim 10 including mounting the outer member over the inner liner when the inner liner is mounted about the mandrel and cooling the outer member during subjecting the inner liner to thermal energy.

12. The method according to claim 2 wherein forming the mandrel includes at least partially winding the first and second elongate members relative to each other and about the longitudinal axis to selectively control a longitudinal length of the mandrel.

13. The method according to claim 1 wherein the first and second elongate members include supplemental surface deformations, the supplemental surface deformations being one of protrusions, curvatures or indentations, and wherein treating the inner liner causes supplemental irregularities in the inner surface of the inner liner generally corresponding to the one of the protrusions, curvatures or indentations.

14. A method for manufacturing a catheter, the method including:
positioning a catheter about a mandrel, the catheter having an inner surface defining a lumen, the mandrel comprising at least first and second elongate members in an at least partial coiled or twisted assembled condition;
treating the catheter whereby the first and second elongate members cause irregularities within the internal surface of the catheter;
disassembling the mandrel, wherein disassembling the mandrel includes at least partially unwinding the first and second elongate members from the at least partial coiled or twisted assembled condition; and
removing the catheter relative to the mandrel.

15. The method according to claim 1 , further comprising forming the mandrel by at least arranging the at least first and second elongate members in an at least partial longitudinal juxtaposed relation with respect to a longitudinal axis defined by the mandrel.

Assignees

• Covidien Lp

Inventors

• Shannon Donald
• Coburn Misty
• Rowson Eric

Classifications

• B29C33/485

  cores or mandrels (collapsible mandrels for shaping tube ends B29C57/02; collapsible mandrels for winding and joining B29C53/824) · CPC title

• B29C43/021

  characterised by the shape of the surface · CPC title

• B29C37/0003

  Discharging moulded articles from the mould (constructions for removing the articles B29C33/44) · CPC title

• B29C37/0053

  Moulding articles characterised by the shape of the surface, e.g. ribs, high polish (mould construction therefor B29C33/42; surface shaping of articles B29C59/00; by incorporating filler in or near the surface B29C70/64) · CPC title

• B29C33/424

  Moulding surfaces provided with means for marking or patterning (for injection moulding B29C45/372) · CPC title