Balloon catheter and method for making same

Patent metadata

Field	Value
Publication number	US-10646698-B2
Application number	US-201715729789-A
Country	US
Kind code	B2
Filing date	Oct 11, 2017
Priority date	Jul 25, 2008
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

In at least one embodiment of the present invention a balloon catheter is provided. The balloon catheter comprises a shaft having a lumen formed therethrough. Connected to the shaft is an inflatable balloon. The inflatable balloon has a balloon wall defining a balloon interior surface and a balloon exterior surface that is opposite the interior surface. In fluid communication with the balloon wall is the lumen for inflating the balloon to define an inflated state and for collapsing the balloon to define a deflated state. The balloon wall is textured in the deflated state such that the balloon interior surface is spatially registered with the balloon exterior surface. The balloon in the inflated state is tensioned to have a surface roughness substantially less than a surface roughness of the balloon in the deflated state.

First claim

The invention claimed is:

1. A method of making a balloon catheter comprising:
blow molding a heated resin within a mold to produce a balloon, the mold having an internal mold surface textured to define a mold surface profile with a corresponding mold surface roughness value, the blow molding including:
forming a heated resin wall that has an exterior resin surface facing the internal mold surface and an interior resin surface opposite the exterior resin surface;
pressurizing the heated resin wall such that the exterior resin surface conforms to the texture of the internal mold surface and the interior resin surface is spatially registered with the exterior resin surface, defining a heated resin wall texture; and
cooling the heated resin wall to form a balloon wall having a balloon texture which corresponds to the heated resin wall texture, defining the balloon; and
attaching the balloon to a shaft to form the balloon catheter, the balloon in fluid communication with the shaft to be inflatable to tension the balloon, substantially reducing a surface roughness of the balloon.

2. The method of claim 1 wherein the mold surface roughness value is at least a numerical average surface roughness value (R a ) of about 6 microns.

3. The method of claim 1 wherein the texture of the internal mold surface corresponds to a random grain pattern formed by electrical discharge machining the mold.

4. The method of claim 1 wherein the texture of the internal mold surface corresponds to a repeating grain pattern formed by chemically etching the mold.

5. A method of making a balloon catheter comprising:
blow molding a heated resin within a mold to produce a balloon, the mold having an internal mold surface textured to define a mold surface profile with a corresponding mold surface roughness value, the blow molding including:
forming a heated resin wall that has an exterior resin surface facing the internal mold surface and an interior resin surface opposite the exterior resin surface;
pressurizing the heated resin wall such that the exterior resin surface conforms to the texture of the internal mold surface and the interior resin surface is spatially registered with the exterior resin surface such that a height of a peak of the outer surface is within 40% of a height of a corresponding peak of the inner surface, defining a heated resin wall texture; and
cooling the heated resin wall to form a balloon wall having a roughened surface which corresponds to the heated resin wall texture, defining the balloon.

6. The method of claim 5 , further comprising attaching the balloon to a shaft to form the balloon catheter, the balloon in fluid communication with the shaft to be inflatable to tension the balloon, substantially reducing a surface roughness of the balloon.

7. The method of claim 5 , wherein the mold surface roughness value is at least a numerical average surface roughness value (R a ) of about 6 microns.

8. The method of claim 5 , wherein the texture of the internal mold surface corresponds to a random grain pattern formed by electrical discharge machining the mold.

9. The method of claim 5 , wherein the texture of the internal mold surface corresponds to a repeating grain pattern formed by chemically etching the mold.

10. A method of making a balloon catheter comprising:
blow molding a heated resin within a mold to produce a balloon, the mold having an internal mold surface textured to define a mold surface profile with a corresponding mold surface roughness value, the blow molding including:
forming a heated resin wall that has an exterior resin surface facing the internal mold surface and an interior resin surface opposite the exterior resin surface;
pressurizing the heated resin wall such that the exterior resin surface conforms to the texture of the internal mold surface and the interior resin surface is spatially registered with the exterior resin surface, defining a heated resin wall texture; and
cooling the heated resin wall to form a balloon wall having a balloon texture which corresponds to the heated resin wall texture, defining the balloon.

11. The method of claim 10 , wherein the mold surface roughness value is at least a numerical average surface roughness value (R a ) of about 6 microns.

12. The method of claim 10 , wherein the texture of the internal mold surface corresponds to a random grain pattern formed by electrical discharge machining the mold.

13. The method of claim 10 , wherein the texture of the internal mold surface corresponds to a repeating grain pattern formed by chemically etching the mold.

14. The method of claim 10 , further comprising attaching the balloon to a shaft to form the balloon catheter, the balloon in fluid communication with the shaft to be inflatable to tension the balloon.

Assignees

• Cook Medical Technologies Llc

Inventors

• Burton David G
• Lysgaard Thomas
• Aggerholm Steen
• Boatman Scott E

Classifications

• A61M25/1034

  Joining of shaft and balloon · CPC title

• A61M2025/0057

  Catheters delivering medicament other than through a conventional lumen, e.g. porous walls or hydrogel coatings · CPC title

• A61M25/1002 Primary

  characterised by balloon shape (A61M25/1006, A61M25/1009 take precedence) · CPC title

• B29K2995/0072

  Roughness, e.g. anti-slip · CPC title

• B29L2031/7543

  Balloon catheters · CPC title