Balloon catheter, in particular for delivering drugs or stents in the region of a stenosis

Patent metadata

Field	Value
Publication number	US-9770575-B2
Application number	US-201113283050-A
Country	US
Kind code	B2
Filing date	Oct 27, 2011
Priority date	Nov 9, 2010
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A balloon catheter, in particular for delivering medicaments, stents or medicament-coated stents in the region of a stenosis, comprising
an outer shaft ( 4 ) an inner shaft ( 6 ), and a balloon ( 7 ) at the distal catheter end, which balloon is dilatable by a feedable pressure fluid and which is attached with its proximal end ( 8 ) to the outer shaft ( 4 ) and with its distal end ( 9 ) to the inner shaft ( 6 ) which protrudes the outer shaft ( 4 ) in the distal direction, and a cover sheath ( 15 ) which is seated in a covering position over the contracted balloon ( 7 ) and is displaceably guided on the outer shaft ( 4 ) and which is displaceable on the outer shaft ( 4 ) in the proximal direction via its front opening ( 17 ) by the dilating balloon ( 7 ) while continuously releasing the same from distal to proximal.

First claim

What is claimed is:

1. A balloon catheter comprising:
an outer shaft comprising a passage opening transverse to its length,
an inner shaft,
a balloon dilatable by a feedable pressure fluid through the outer shaft, wherein the proximal end of the balloon is attached to the outer shaft entirely distal to the passage opening to provide access to an intermediate space outside of the outer shaft without entering the balloon, further wherein the inner shaft protrudes from the outer shaft in a distal direction, and
a cover sheath which is seated in a covering position over the passage opening and the balloon when the balloon is contracted, wherein during dilation of the balloon the cover sheath seals against both the outer shaft and the balloon in a pressure-tight manner and the balloon emerges from a front opening at a distal end of the cover sheath to displaceably guide the cover sheath along the outer shaft in a proximal direction via its front opening, thereby continuously releasing the dilating balloon from distal to proximal,
wherein the intermediate space positioned between the cover sheath and the balloon communicates with a pressure fluid line to the balloon via the passage opening outside of the balloon.

2. The balloon catheter according to claim 1 , characterized in that the intermediate space between the cover sheath and the balloon delivers pressurized fluid outside and proximal to the balloon to counteract wedging of the balloon against the sheath during dilation.

3. A balloon catheter loaded with a stent, comprising:
an outer shaft comprising a passage opening transverse to its length,
an inner shaft,
a balloon dilatable by a feedable pressure fluid through the outer shaft, wherein the proximal end of the balloon is attached to the outer shaft entirely distal to the passage opening to provide access to an intermediate space outside of the outer shaft without entering the balloon, further wherein the inner shaft protrudes from the outer shaft in a distal direction,
a cover sheath which is seated in a covering position over the passage opening and the balloon when the balloon is contracted, wherein during dilation of the balloon the balloon emerges from a front opening at a distal end of the cover sheath and displaceably guides the cover sheath along the outer shaft in a proximal direction via its front opening to continuously release the dilating balloon from distal to proximal, and
a stent arranged on the balloon, which stent is retained in its contracted state enclosed by the cover sheath in the covering position of the latter and can be automatically released by the dilatation of the balloon while displacing the cover sheath at the same time in the proximal direction,
wherein the intermediate space positioned between the cover sheath and the balloon communicates with a pressure fluid line to the balloon via the passage opening outside of the balloon.

4. The balloon catheter according to claim 1 , characterized in that the balloon is provided on its outer side with a medicament coating which can be released in the proximal direction by the dilatation of the balloon while displacing the cover sheath at the same time.

5. The balloon catheter according to claim 1 , characterized in that a dead stop is arranged on the outer shaft for limiting the displacement path of the cover sheath in the proximal direction while maintaining the seals.

6. The balloon catheter according to claim 1 , characterized in that the balloon is attached with its distal end via a cone body to the inner shaft.

7. The balloon catheter according to claim 6 , characterized in that in the covering position of the cover sheath, an initial opening gap remains for the balloon between the front opening of the cover sheath and the cone body.

8. The balloon catheter according to claim 3 , characterized in that the balloon is provided on its outer side with a medicament coating which can be released in the proximal direction by the dilatation of the balloon while displacing the cover sheath at the same time.

9. The balloon catheter according to claim 3 , characterized in that the balloon is attached with its distal end via a cone body to the inner shaft.

10. The balloon catheter according to claim 3 , characterized in that a dead stop is arranged on the outer shaft for limiting the displacement path of the cover sheath in the proximal direction while maintaining the seals.

11. The balloon catheter according to claim 10 , characterized in that in the covering position of the cover sheath, an initial opening gap remains for the balloon between the front opening of the cover sheath and the cone body.

Assignees

• Wesselmann Matthias
• Brunner Tobias
• Lang Hans
• Biotronik Ag

Inventors

• Wesselmann Matthias
• Brunner Tobias
• Lang Hans

Classifications

• A61M25/1006 Primary

  Balloons formed between concentric tubes · CPC title

• A61M2025/1061

  having separate inflations tubes, e.g. coaxial tubes or tubes otherwise arranged apart from the catheter tube · CPC title

• A61F2/958

  Inflatable balloons for placing stents or stent-grafts · CPC title

• A61M2025/1068

  having means for varying the length or diameter of the deployed balloon, this variations could be caused by excess pressure · CPC title

• A61F2/966

  with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod · CPC title